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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0803.3582 | Biswajit Adhikary | Biswajit Adhikary and Ambar Ghosal | Nonzero U_{e3}, CP violation and leptogenesis in a see-saw type softly
broken A_4 symmetric model | 35 pages, 16 figures, discussion and reference added, version to
appear in Phys. Rev. D | Phys.Rev.D78:073007,2008 | 10.1103/PhysRevD.78.073007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have shown that non-zero U_{e3} is generated in a see-saw type softly
broken A_4 symmetric model through a single parameter perturbation in m_D in a
single element. We have explored all possible 9 cases to study the neutrino
mixing angles considering the best fitted values of \Delta m_{\odot}^2 and
\Delta m_{atm}^2 with all parameters real. We have extended our analysis for
the complex case and demonstrated large low energy CP violation (J_{CP}\simeq
10^{-2}) and m_{ee} in addition to mixing and mass pattern. We have also
investigated leptogenesis and for a reasonable choice of model parameters
compatible with low energy data, WMAP value of baryon asymmetry 6\times
10^{-10} is obtained for right handed neutrino mass scale M_0\simeq 10^{13}
GeV. We have obtained a relation among the phases responsible for leptogenesis
and have shown that these phases also have correlations with low energy CP
violating phases.
| [
{
"created": "Tue, 25 Mar 2008 16:05:56 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2008 11:22:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Adhikary",
"Biswajit",
""
],
[
"Ghosal",
"Ambar",
""
]
] | We have shown that non-zero U_{e3} is generated in a see-saw type softly broken A_4 symmetric model through a single parameter perturbation in m_D in a single element. We have explored all possible 9 cases to study the neutrino mixing angles considering the best fitted values of \Delta m_{\odot}^2 and \Delta m_{atm}^2 with all parameters real. We have extended our analysis for the complex case and demonstrated large low energy CP violation (J_{CP}\simeq 10^{-2}) and m_{ee} in addition to mixing and mass pattern. We have also investigated leptogenesis and for a reasonable choice of model parameters compatible with low energy data, WMAP value of baryon asymmetry 6\times 10^{-10} is obtained for right handed neutrino mass scale M_0\simeq 10^{13} GeV. We have obtained a relation among the phases responsible for leptogenesis and have shown that these phases also have correlations with low energy CP violating phases. |
hep-ph/0007182 | Yuri V. Kovchegov | Dmitri E. Kharzeev (BNL), Yuri V. Kovchegov (BNL), Eugene Levin (Tel
Aviv U./BNL) | QCD Instantons and the Soft Pomeron | 20 pages, 8 figures, ReVTeX | Nucl.Phys. A690 (2001) 621-646 | 10.1016/S0375-9474(01)00352-9 | BNL-NT-00/18, TAUP-2637-200 | hep-ph hep-th nucl-th | null | We study the role of semi-classical QCD vacuum solutions in high energy
scattering by considering the instanton contribution to hadronic cross
sections. We propose a new type of instanton-induced interactions (``instanton
ladder'') that leads to the rising with energy hadronic cross section of Regge
type (the Pomeron). We argue that this interaction may be responsible for the
structure of the soft Pomeron. The intercept is calculated. It has a
non-analytic dependence on the strong coupling constant, allowing a
non-singular continuation into the non-perturbative region. We derive the
Pomeron trajectory, which appears to be approximately linear in some range of
(negative) momentum transfer t, but exhibits a curvature at small t. Possible
role of instantons in multiparticle production is also discussed.
| [
{
"created": "Tue, 18 Jul 2000 16:12:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kharzeev",
"Dmitri E.",
"",
"BNL"
],
[
"Kovchegov",
"Yuri V.",
"",
"BNL"
],
[
"Levin",
"Eugene",
"",
"Tel\n Aviv U./BNL"
]
] | We study the role of semi-classical QCD vacuum solutions in high energy scattering by considering the instanton contribution to hadronic cross sections. We propose a new type of instanton-induced interactions (``instanton ladder'') that leads to the rising with energy hadronic cross section of Regge type (the Pomeron). We argue that this interaction may be responsible for the structure of the soft Pomeron. The intercept is calculated. It has a non-analytic dependence on the strong coupling constant, allowing a non-singular continuation into the non-perturbative region. We derive the Pomeron trajectory, which appears to be approximately linear in some range of (negative) momentum transfer t, but exhibits a curvature at small t. Possible role of instantons in multiparticle production is also discussed. |
1212.1921 | Aoife Bharucha | Aoife Bharucha | Determining MSSM parameters via chargino production at the LC: a
one-loop analysis | 6 pages, Conference: C12-07-04, v2: typo corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Very precise measurements of masses and cross sections are expected to be
achievable with a future linear collider. With such an accuracy one must
incorporate loop corrections in order to make meaningful predictions for the
underlying new physics parameters. For the electroweakino sector, this involves
fitting one-loop predictions to expected measurements of the cross section and
forward-backward asymmetry for chargino pair production and of the accessible
chargino and neutralino masses. We consider two scenarios with characteristic
features, chosen taking recent LHC SUSY and Higgs searches into account. Our
analysis allows the accurate determination of the desired parameters and,
additionally, access to stop sector parameters that enter via loop corrections.
| [
{
"created": "Sun, 9 Dec 2012 21:45:33 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2013 08:49:48 GMT",
"version": "v2"
}
] | 2013-09-26 | [
[
"Bharucha",
"Aoife",
""
]
] | Very precise measurements of masses and cross sections are expected to be achievable with a future linear collider. With such an accuracy one must incorporate loop corrections in order to make meaningful predictions for the underlying new physics parameters. For the electroweakino sector, this involves fitting one-loop predictions to expected measurements of the cross section and forward-backward asymmetry for chargino pair production and of the accessible chargino and neutralino masses. We consider two scenarios with characteristic features, chosen taking recent LHC SUSY and Higgs searches into account. Our analysis allows the accurate determination of the desired parameters and, additionally, access to stop sector parameters that enter via loop corrections. |
hep-ph/9505430 | Layssac Jacques | G.J. Gounaris, J.Layssac, and F.M. Renard | Signatures of anomalous coupling in boson pair production through \gamma
\gamma collisions | 15 pages, latex file + 8 figures in ps file. | Z.Phys.C69:505-512,1996 | 10.1007/s002880050054 | PM 95-11 THES-TP 95-06 | hep-ph | null | We discuss possible New Physics (NP) effects on the processes $\gamma\gamma
\to W^+W^-$, $ZZ$, $Z\gamma$, $\gamma\gamma$, $HH$ which are observable in
$\gamma\gamma$ collisions. Such collisions may be achieved through laser
backscattering at a high energy $e^+e^-$ linear collider. To the extent that no
new particles will be directly produced in the future colliders, it has already
been emphasized that the new physics possibly hidden in the bosonic
interactions, may be represented by the seven $dim=6$ operators $\O_W$,
$\O_{B\Phi}$, $\O_{W\Phi}$, $\O_{UB}$, $\O_{UW}$, $\ol{\O}_{UB}$ and
$\ol{\O}_{UW}$ (the last two ones being CP-violating). In this paper, we show
that the above processes are sensitive to NP scales at the several TeV range,
and we subsequently discuss the possibility to disentangle the effects of the
various operators.
| [
{
"created": "Wed, 31 May 1995 09:49:32 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gounaris",
"G. J.",
""
],
[
"Layssac",
"J.",
""
],
[
"Renard",
"F. M.",
""
]
] | We discuss possible New Physics (NP) effects on the processes $\gamma\gamma \to W^+W^-$, $ZZ$, $Z\gamma$, $\gamma\gamma$, $HH$ which are observable in $\gamma\gamma$ collisions. Such collisions may be achieved through laser backscattering at a high energy $e^+e^-$ linear collider. To the extent that no new particles will be directly produced in the future colliders, it has already been emphasized that the new physics possibly hidden in the bosonic interactions, may be represented by the seven $dim=6$ operators $\O_W$, $\O_{B\Phi}$, $\O_{W\Phi}$, $\O_{UB}$, $\O_{UW}$, $\ol{\O}_{UB}$ and $\ol{\O}_{UW}$ (the last two ones being CP-violating). In this paper, we show that the above processes are sensitive to NP scales at the several TeV range, and we subsequently discuss the possibility to disentangle the effects of the various operators. |
hep-ph/0502090 | Loyal Durand | Loyal Durand (1) and Phuoc Ha (2) ((1) University of
Wisconsin-Madison, (2) Indiana University-South Bend and Institute of Physics
and Electronics- Vietnamese Academy of Science and Technology) | Electromagnetic corrections to baryon masses | RevTeX4, 27 pages, 9 figures | Phys.Rev.D71:073015,2005; Erratum-ibid.D75:039903,2007 | 10.1103/PhysRevD.71.073015 10.1103/PhysRevD.75.039903 | null | hep-ph | null | We analyze the electromagnetic contributions to the octet and decuplet baryon
masses using the heavy baryon approximation in chiral effective field theory
and methods we developed in earlier analyses of the baryon masses and magnetic
moments. Our methods connect simply to Morpurgo's general parametrization of
the electromagnetic contributions and to semirelativistic quark models. Our
calculations are carried out including the one-loop mesonic corrections to the
basic electromagnetic interactions, so to two loops overall. We find that to
this order in the chiral loop expansion there are no three-body contributions.
The Coleman-Glashow relation and other sum rules derived in quark models with
only two-body terms therefore continue to hold, and violations involve at least
three-loop processes and can be expected to be quite small. We present the
complete formal results and some estimates of the matrix elements here.
Numerical calculations will be presented separately.
| [
{
"created": "Wed, 9 Feb 2005 18:46:05 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Durand",
"Loyal",
""
],
[
"Ha",
"Phuoc",
""
]
] | We analyze the electromagnetic contributions to the octet and decuplet baryon masses using the heavy baryon approximation in chiral effective field theory and methods we developed in earlier analyses of the baryon masses and magnetic moments. Our methods connect simply to Morpurgo's general parametrization of the electromagnetic contributions and to semirelativistic quark models. Our calculations are carried out including the one-loop mesonic corrections to the basic electromagnetic interactions, so to two loops overall. We find that to this order in the chiral loop expansion there are no three-body contributions. The Coleman-Glashow relation and other sum rules derived in quark models with only two-body terms therefore continue to hold, and violations involve at least three-loop processes and can be expected to be quite small. We present the complete formal results and some estimates of the matrix elements here. Numerical calculations will be presented separately. |
hep-ph/9511413 | Afsar Abbas | Lina Paria, M. G. Mustafa and Afsar Abbas | A Heavy Glueball in a Bag Model at Finite Temperature | 9 latex pages and three figures are available on request from the
first author (lina@iopb.ernet.in) | null | null | IP/BBSR/95-106 | hep-ph astro-ph | null | We obtain a heavy glueball (much heavier than the ones studied by others
which usually are in the range of 1-2 GeV) in a bag model calculation with
exact discrete single particle states of gluons at finite temperature. This
heavy glueball, within the cosmological context, is what Abbas has recently
predicted (hep-ph/9504430).
| [
{
"created": "Fri, 24 Nov 1995 21:16:36 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Paria",
"Lina",
""
],
[
"Mustafa",
"M. G.",
""
],
[
"Abbas",
"Afsar",
""
]
] | We obtain a heavy glueball (much heavier than the ones studied by others which usually are in the range of 1-2 GeV) in a bag model calculation with exact discrete single particle states of gluons at finite temperature. This heavy glueball, within the cosmological context, is what Abbas has recently predicted (hep-ph/9504430). |
1606.07689 | Monalisa Patra | Mariana Frank, Katri Huitu, Ushoshi Maitra, Monalisa Patra | Probing Higgs-radion mixing in warped models through complementary
searches at the LHC and the ILC | 27 pages, 42 figures, 1 Table | Phys. Rev. D 94, 055016 (2016) | 10.1103/PhysRevD.94.055016 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Higgs-radion mixing in the context of warped space extra
dimensional models with custodial symmetry and investigate the prospects of
detecting the mixed radion. Custodial symmetries allow the Kaluza-Klein
excitations to be lighter, and protect Zbb to be in agreement with experimental
constraints. We perform a complementary study of discovery reaches of the
Higgs-radion mixed state at the 13 and 14 TeV LHC and at the 500 and 1000 GeV
ILC. We carry out a comprehensive analysis of the most significant production
and decay modes of the mixed radion in the 80 GeV - 1 TeV mass range, and
indicate the parameter space that can be probed at the LHC and the ILC. There
exists a region of the parameter space which can be probed, at the LHC, through
the diphoton channel even for a relatively low luminosity of 50 fb^{-1}. The
reach of the 4-lepton final state, in probing the parameter space is also
studied in the context of 14 TeV LHC, for a luminosity of 1000 fb^{-1}. At the
ILC, with an integrated luminosity of 500 fb^{-1}, we analyze the Z-radion
associated production and the WW fusion production, followed by the radion
decay into bb and W+W-. The WW fusion production is favored over the Z-radion
associated channel in probing regions of the parameter space beyond the LHC
reach. The complementary study at the LHC and the ILC is useful both for the
discovery of the radion and the understanding of its mixing sector.
| [
{
"created": "Fri, 24 Jun 2016 14:04:46 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Frank",
"Mariana",
""
],
[
"Huitu",
"Katri",
""
],
[
"Maitra",
"Ushoshi",
""
],
[
"Patra",
"Monalisa",
""
]
] | We consider the Higgs-radion mixing in the context of warped space extra dimensional models with custodial symmetry and investigate the prospects of detecting the mixed radion. Custodial symmetries allow the Kaluza-Klein excitations to be lighter, and protect Zbb to be in agreement with experimental constraints. We perform a complementary study of discovery reaches of the Higgs-radion mixed state at the 13 and 14 TeV LHC and at the 500 and 1000 GeV ILC. We carry out a comprehensive analysis of the most significant production and decay modes of the mixed radion in the 80 GeV - 1 TeV mass range, and indicate the parameter space that can be probed at the LHC and the ILC. There exists a region of the parameter space which can be probed, at the LHC, through the diphoton channel even for a relatively low luminosity of 50 fb^{-1}. The reach of the 4-lepton final state, in probing the parameter space is also studied in the context of 14 TeV LHC, for a luminosity of 1000 fb^{-1}. At the ILC, with an integrated luminosity of 500 fb^{-1}, we analyze the Z-radion associated production and the WW fusion production, followed by the radion decay into bb and W+W-. The WW fusion production is favored over the Z-radion associated channel in probing regions of the parameter space beyond the LHC reach. The complementary study at the LHC and the ILC is useful both for the discovery of the radion and the understanding of its mixing sector. |
1112.0962 | Pablo Roig | Pablo Roig (Valencia, Universidad Cat\'olica San Vicente M\'artir &
Barcelona, IFAE) | Hadronic currents for $\tau^-\to\pi^-\pi^0\nu_\tau$ and other decays of
interest in TAUOLA | 4 pages, no figures. Talk given in the 'From PHI to PSI 2011'
Conference (Novosibirsk, Russia). To appear in the Proceedings | NUPHBP14263 (Nuclear Physics B (Proceedings Supplements) (2012),
pp. 161-164) | 10.1016/j.nuclphysbps.2012.02.034 | UAB-FT-703 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new set of hadronic form factors, which has been implemented in TAUOLA, is
described.
| [
{
"created": "Mon, 5 Dec 2011 15:11:42 GMT",
"version": "v1"
}
] | 2012-07-17 | [
[
"Roig",
"Pablo",
"",
"Valencia, Universidad Católica San Vicente Mártir &\n Barcelona, IFAE"
]
] | A new set of hadronic form factors, which has been implemented in TAUOLA, is described. |
2312.05712 | Shanmuka Shivashankara | Shanmuka Shivashankara, Patti Rizzo, Nicole Cafe | Entanglement Entropy Distributions of a Muon Decay | null | LHEP 2024 (2024) 531 | 10.31526/lhep.2024.531 | null | hep-ph hep-th quant-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Divergences that occur in density matrices of decay and scattering processes
are shown to be regularized by tracing and unitarity or the optical theorem.
These divergences are regularized by the lifetime of the decaying particle or
the total scattering cross section. Also, this regularization is shown to give
the expected helicities of final particles. The density matrix is derived for
the weak decay of a polarized muon at rest, $\mu^- \rightarrow \nu_{\mu} (e^-
\bar \nu_e)$, with Lorentz invariant density matrix entries and unitarity
upheld at tree level. The electron's von Neumann entanglement entropy
distributions are calculated with respect to both the electron's emission angle
and energy. The angular entropy distribution favors an electron emitted
backwards with respect to the muon's polarization given a minimum volume
regularization. The kinematic entropy distribution is maximal at half the
muon's rest mass energy. These results are similar to the electron's angular
and kinematic decay rate distributions. Both the density matrix and
entanglement entropy can be cast either in terms of ratios of areas or volumes.
| [
{
"created": "Sun, 10 Dec 2023 00:02:34 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Shivashankara",
"Shanmuka",
""
],
[
"Rizzo",
"Patti",
""
],
[
"Cafe",
"Nicole",
""
]
] | Divergences that occur in density matrices of decay and scattering processes are shown to be regularized by tracing and unitarity or the optical theorem. These divergences are regularized by the lifetime of the decaying particle or the total scattering cross section. Also, this regularization is shown to give the expected helicities of final particles. The density matrix is derived for the weak decay of a polarized muon at rest, $\mu^- \rightarrow \nu_{\mu} (e^- \bar \nu_e)$, with Lorentz invariant density matrix entries and unitarity upheld at tree level. The electron's von Neumann entanglement entropy distributions are calculated with respect to both the electron's emission angle and energy. The angular entropy distribution favors an electron emitted backwards with respect to the muon's polarization given a minimum volume regularization. The kinematic entropy distribution is maximal at half the muon's rest mass energy. These results are similar to the electron's angular and kinematic decay rate distributions. Both the density matrix and entanglement entropy can be cast either in terms of ratios of areas or volumes. |
1612.02276 | Astrid Nathalie Hiller Blin | Thomas Gutsche, Astrid N. Hiller Blin, Sergey Kovalenko, Serguei
Kuleshov, Valery E. Lyubovitskij, Manuel J. Vicente Vacas, Alexey Zhevlakov | CP-violating decays of the pseudoscalars eta and eta' and their
connection to the electric dipole moment of the neutron | null | Phys. Rev. D 95, 036022 (2017) | 10.1103/PhysRevD.95.036022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the present upper bound on the neutron electric dipole moment, we give
an estimate for the upper limit of the CP-violating couplings of the eta(eta')
to the nucleon. Using this result, we then derive constraints on the
CP-violating eta(eta')-pi-pi couplings, which define the two-pion CP-violating
decays of the eta and eta' mesons. Our results are relevant for the running and
planned measurements of rare decays of the eta and eta' mesons by the GlueX
Collaboration at JLab and the LHCb Collaboration at CERN.
| [
{
"created": "Wed, 7 Dec 2016 14:59:37 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Gutsche",
"Thomas",
""
],
[
"Blin",
"Astrid N. Hiller",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Kuleshov",
"Serguei",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Vacas",
"Manuel J. Vicente",
""
],
[
"Zhevlakov",... | Using the present upper bound on the neutron electric dipole moment, we give an estimate for the upper limit of the CP-violating couplings of the eta(eta') to the nucleon. Using this result, we then derive constraints on the CP-violating eta(eta')-pi-pi couplings, which define the two-pion CP-violating decays of the eta and eta' mesons. Our results are relevant for the running and planned measurements of rare decays of the eta and eta' mesons by the GlueX Collaboration at JLab and the LHCb Collaboration at CERN. |
hep-ph/9509409 | null | Jens O. Andersen | The Free Energy of High Temperature QED to Order $e^{5}$ From Effective
Field Theory | 10 pages Latex, 6 figures | Phys.Rev. D53 (1996) 7286-7292 | 10.1103/PhysRevD.53.7286 | Oslo-TP 11-95 | hep-ph | null | Massless quantum electrodynamics is studied at high temperature and zero
chemical potential. We compute the Debye screening mass to order $e^{4}$ and
the free energy to order $e^{5}$} by an effective field theory approach,
recently developed by Braaten and Nieto. Our results are in agreement with
calculations done in resummed perturbation theory. This method makes it
possible to separate contributions to the free energy from different momentum
scales (order $T$ and $eT$) and provides an economical alternative to
computations in the full theory which involves the dressing of internal
propagators.
| [
{
"created": "Thu, 28 Sep 1995 11:49:46 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Sep 1995 09:07:05 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Andersen",
"Jens O.",
""
]
] | Massless quantum electrodynamics is studied at high temperature and zero chemical potential. We compute the Debye screening mass to order $e^{4}$ and the free energy to order $e^{5}$} by an effective field theory approach, recently developed by Braaten and Nieto. Our results are in agreement with calculations done in resummed perturbation theory. This method makes it possible to separate contributions to the free energy from different momentum scales (order $T$ and $eT$) and provides an economical alternative to computations in the full theory which involves the dressing of internal propagators. |
1906.06573 | Francesco Giuli Dr. | Francesco Giuli, Marco Bonvini | Improved description of the HERA data with a new simple PDF
parametrization | 6 pages, 3 figures. Proceeding of talk given at DIS19 (Turin, Italy)
- PoS(DIS2019)014 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new parametrization for the parton distribution functions with a higher
flexibility in the small-$x$ region is presented. It has been implemented in
the xFitter open-source PDF fitting tool, and compared to the default xFitter
parametrization, used for the determination of the HERAPDF set. It has been
found that the combined inclusive HERA I+II data can be described using NNLO
theory with a significantly higher quality than HERAPDF2.0: the $\chi^2$ is
reduced by more than 60 units, having used only four more parameters. Our
result highlights a significant parametrization bias in the default xFitter
parametrization at small $x$, which would lead to even more dramatic effects
when used for higher energy colliders, where the small-$x$ region is more
relevant. We also find that the inclusion of small-$x$ resummation leads to a
further reduction by approximately 30 extra units in $\chi^2$. In this
contribution, we review the results of the recent paper "A new simple PDF
parametrization: improved description of the HERA data" (arXiv:1902.11125).
| [
{
"created": "Sat, 15 Jun 2019 14:44:33 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2019 11:51:34 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jun 2019 07:20:28 GMT",
"version": "v3"
},
{
"created": "Tue, 25 Jun 2019 15:32:32 GMT",
"version": "v4"
}
] | 2019-06-26 | [
[
"Giuli",
"Francesco",
""
],
[
"Bonvini",
"Marco",
""
]
] | A new parametrization for the parton distribution functions with a higher flexibility in the small-$x$ region is presented. It has been implemented in the xFitter open-source PDF fitting tool, and compared to the default xFitter parametrization, used for the determination of the HERAPDF set. It has been found that the combined inclusive HERA I+II data can be described using NNLO theory with a significantly higher quality than HERAPDF2.0: the $\chi^2$ is reduced by more than 60 units, having used only four more parameters. Our result highlights a significant parametrization bias in the default xFitter parametrization at small $x$, which would lead to even more dramatic effects when used for higher energy colliders, where the small-$x$ region is more relevant. We also find that the inclusion of small-$x$ resummation leads to a further reduction by approximately 30 extra units in $\chi^2$. In this contribution, we review the results of the recent paper "A new simple PDF parametrization: improved description of the HERA data" (arXiv:1902.11125). |
1010.1027 | Christian Bauer | Christian W. Bauer, Bjorn O. Lange, Grigory Ovanesyan | On Glauber modes in Soft-Collinear Effective Theory | 19 pages, three figures. Uses JHEP3.cls | JHEP 1107:077,2011 | 10.1007/JHEP07(2011)077 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gluon interactions involving spectator partons in collisions at hadronic
machines are investigated. We find a class of examples in which a mode, called
Glauber gluons, must be introduced to the effective theory for consistency.
| [
{
"created": "Tue, 5 Oct 2010 21:37:37 GMT",
"version": "v1"
}
] | 2011-07-21 | [
[
"Bauer",
"Christian W.",
""
],
[
"Lange",
"Bjorn O.",
""
],
[
"Ovanesyan",
"Grigory",
""
]
] | Gluon interactions involving spectator partons in collisions at hadronic machines are investigated. We find a class of examples in which a mode, called Glauber gluons, must be introduced to the effective theory for consistency. |
2002.11716 | Aleksander Filip Zarnecki | Aleksander Filip Zarnecki, Jan Kalinowski, Jan Klamka, Pawel Sopicki,
Wojciech Kotlarski, Tania Robens, Dorota Sokolowska | Searching Inert Scalars at Future e$^+$e$^-$ Colliders | Talk presented at the International Workshop on Future Linear
Colliders (LCWS2019), Sendai, Japan, 28 October-1 November, 2019. C19-10-28.
arXiv admin note: substantial text overlap with arXiv:1908.04659 | null | null | RBI-ThPhys-2020-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Inert Doublet Model (IDM) is one of the simplest extensions of the
Standard Model (SM), providing a dark matter candidate. It is a two Higgs
doublet model with a discrete $Z_2$ symmetry, that prevents the scalars of the
second doublet (inert scalars) from coupling to the SM fermions and makes the
lightest of them stable. We study a large number of IDM scenarios, which are
consistent with current constraints on direct detection and relic density of
dark matter, as well as with all collider and low-energy limits. We propose a
set of benchmark points with different kinematic features, that promise
detectable signals at future $e^+e^-$ colliders. Two inert scalar
pair-production processes are considered, $e^+e^- \to A~H $ and $e^+e^- \to
H^+H^-$, followed by decays of $A$ and $H^\pm$ into final states which always
include the lightest and stable neutral scalar dark matter candidate $H$.
Significance of the expected observations is studied for different benchmark
models and different running scenarios, for centre-of-mass energies from 250
GeV up to 3 TeV. For low mass scenarios, high significance can be obtained for
the signal signatures with two muons or an electron and a muon in the final
state. For high mass scenarios, which are only accessible at high energy stages
of CLIC, the significance is too low for the leptonic signature and the
semi-leptonic final state has to be used as the discovery channel. Results
presented for this channel are based on the fast simulation of the CLIC
detector response with the DELPHES package.
| [
{
"created": "Wed, 26 Feb 2020 12:11:17 GMT",
"version": "v1"
}
] | 2020-02-28 | [
[
"Zarnecki",
"Aleksander Filip",
""
],
[
"Kalinowski",
"Jan",
""
],
[
"Klamka",
"Jan",
""
],
[
"Sopicki",
"Pawel",
""
],
[
"Kotlarski",
"Wojciech",
""
],
[
"Robens",
"Tania",
""
],
[
"Sokolowska",
"Dorota",
... | The Inert Doublet Model (IDM) is one of the simplest extensions of the Standard Model (SM), providing a dark matter candidate. It is a two Higgs doublet model with a discrete $Z_2$ symmetry, that prevents the scalars of the second doublet (inert scalars) from coupling to the SM fermions and makes the lightest of them stable. We study a large number of IDM scenarios, which are consistent with current constraints on direct detection and relic density of dark matter, as well as with all collider and low-energy limits. We propose a set of benchmark points with different kinematic features, that promise detectable signals at future $e^+e^-$ colliders. Two inert scalar pair-production processes are considered, $e^+e^- \to A~H $ and $e^+e^- \to H^+H^-$, followed by decays of $A$ and $H^\pm$ into final states which always include the lightest and stable neutral scalar dark matter candidate $H$. Significance of the expected observations is studied for different benchmark models and different running scenarios, for centre-of-mass energies from 250 GeV up to 3 TeV. For low mass scenarios, high significance can be obtained for the signal signatures with two muons or an electron and a muon in the final state. For high mass scenarios, which are only accessible at high energy stages of CLIC, the significance is too low for the leptonic signature and the semi-leptonic final state has to be used as the discovery channel. Results presented for this channel are based on the fast simulation of the CLIC detector response with the DELPHES package. |
2110.03908 | Jae Sik Lee | Jae Sik Lee and Jubin Park | Yukawa Alignment Revisited in the Higgs Basis | 30 pages, 7 figures, 1 table; References added, title and list of
contributing authors adjusted, substantially improved version to appear in
PRD | null | 10.1103/PhysRevD.106.015023 | IUEP-HEP-21-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We implement a comprehensive and detailed study of the alignment of Yukawa
couplings in the so-called Higgs basis taking the framework of general two
Higgs doublet models (2HDMs). We clarify the model input parameters and derive
the Yukawa couplings considering the two types of CP-violating sources: one
from the Higgs potential and the other from the three complex alignment
parameters $\zeta_{f=u,d,e}$. We consider the theoretical constraints from the
perturbative unitarity and for the Higgs potential to be bounded from below as
well as the experimental ones from electroweak precision observables. Also
considered are the constraints on the alignment parameters from flavor-changing
$\tau$ decays, $Z\to b\bar b$, $\epsilon_K$, and the radiative $b\to s\gamma$
decay. By introducing the basis-independent Yukawa delay factor
$\Delta_{H_1\bar f f}\equiv |\zeta_{f}|(1-g_{_{H_1VV}}^2)^{1/2}$, we scrutinize
the alignment of the Yukawa couplings of the lightest Higgs boson to the SM
fermions.
| [
{
"created": "Fri, 8 Oct 2021 06:02:10 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2022 05:50:26 GMT",
"version": "v2"
}
] | 2022-08-31 | [
[
"Lee",
"Jae Sik",
""
],
[
"Park",
"Jubin",
""
]
] | We implement a comprehensive and detailed study of the alignment of Yukawa couplings in the so-called Higgs basis taking the framework of general two Higgs doublet models (2HDMs). We clarify the model input parameters and derive the Yukawa couplings considering the two types of CP-violating sources: one from the Higgs potential and the other from the three complex alignment parameters $\zeta_{f=u,d,e}$. We consider the theoretical constraints from the perturbative unitarity and for the Higgs potential to be bounded from below as well as the experimental ones from electroweak precision observables. Also considered are the constraints on the alignment parameters from flavor-changing $\tau$ decays, $Z\to b\bar b$, $\epsilon_K$, and the radiative $b\to s\gamma$ decay. By introducing the basis-independent Yukawa delay factor $\Delta_{H_1\bar f f}\equiv |\zeta_{f}|(1-g_{_{H_1VV}}^2)^{1/2}$, we scrutinize the alignment of the Yukawa couplings of the lightest Higgs boson to the SM fermions. |
1211.6912 | Thomas Lang | Thomas Lang, Hendrik van Hees, Jan Steinheimer, Marcus Bleicher | Heavy quark transport in heavy ion collisions at RHIC and LHC within the
UrQMD transport model | 20 pages, 28 figures | Phys. Rev. C 93, 014901 (2016) | 10.1103/PhysRevC.93.014901 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have implemented a Langevin approach for the transport of heavy quarks in
the UrQMD hybrid model. The UrQMD hybrid approach provides a realistic
description of the background medium for the evolution of relativistic heavy
ion collisions. We have used two different sets of drag and diffusion
coefficients, one based on a $T$-Matrix approach and one based on a resonance
model for the elastic scattering of heavy quarks within the medium. In case of
the resonance model we have investigated the effects of different decoupling
temperatures of the heavy quarks from the medium, ranging between
$130\,\text{MeV}$ and $180\,\text{MeV}$. We present calculations of the nuclear
modification factor $R_{AA}$, as well as of the elliptic flow $v_2$ in Au+Au
collisions at $\sqrt{s_{NN}}=200\,\text{GeV}$ and Pb+Pb collisions at
$\sqrt{s_{NN}}=2.76\,\text{TeV}$. To make our results comparable to
experimental data at RHIC and LHC we have implemented a Peterson fragmentation
and a quark coalescence approach followed by the semileptonic decay of the D-
and B-mesons to electrons. We find that our results strongly depend on the
decoupling temperature and the hadronization mechanism. At a decoupling
temperature of $130\,\text{MeV}$ we reach a good agreement with the
measurements at both, RHIC and LHC energies, simultaneously for the elliptic
flow $v_2$ and the nuclear modification factor $R_{AA}$.
| [
{
"created": "Thu, 29 Nov 2012 13:38:36 GMT",
"version": "v1"
}
] | 2016-01-13 | [
[
"Lang",
"Thomas",
""
],
[
"van Hees",
"Hendrik",
""
],
[
"Steinheimer",
"Jan",
""
],
[
"Bleicher",
"Marcus",
""
]
] | We have implemented a Langevin approach for the transport of heavy quarks in the UrQMD hybrid model. The UrQMD hybrid approach provides a realistic description of the background medium for the evolution of relativistic heavy ion collisions. We have used two different sets of drag and diffusion coefficients, one based on a $T$-Matrix approach and one based on a resonance model for the elastic scattering of heavy quarks within the medium. In case of the resonance model we have investigated the effects of different decoupling temperatures of the heavy quarks from the medium, ranging between $130\,\text{MeV}$ and $180\,\text{MeV}$. We present calculations of the nuclear modification factor $R_{AA}$, as well as of the elliptic flow $v_2$ in Au+Au collisions at $\sqrt{s_{NN}}=200\,\text{GeV}$ and Pb+Pb collisions at $\sqrt{s_{NN}}=2.76\,\text{TeV}$. To make our results comparable to experimental data at RHIC and LHC we have implemented a Peterson fragmentation and a quark coalescence approach followed by the semileptonic decay of the D- and B-mesons to electrons. We find that our results strongly depend on the decoupling temperature and the hadronization mechanism. At a decoupling temperature of $130\,\text{MeV}$ we reach a good agreement with the measurements at both, RHIC and LHC energies, simultaneously for the elliptic flow $v_2$ and the nuclear modification factor $R_{AA}$. |
hep-ph/0001136 | Mauro | J. L. Lucio (U. of Guanajuato, Mexico and LNF-INFN, Italy), M.
Napsuciale (U. of Guanajuato, Mexico) | phi -> pi0 pi0 gamma Decay within a U(3)x U(3) Linear Sigma Model | 5 Pags. 2 Figs. Contribution to DAFNE99, Frascati Italy Nov (99) | null | null | null | hep-ph | null | We show that therecently observed pion invariant mass distribution of the phi
->pi0 pi0 gamma decay can be satisfactorily described by the chiral U(3) X U(3)
Linear Sigma Model.
| [
{
"created": "Fri, 14 Jan 2000 19:15:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lucio",
"J. L.",
"",
"U. of Guanajuato, Mexico and LNF-INFN, Italy"
],
[
"Napsuciale",
"M.",
"",
"U. of Guanajuato, Mexico"
]
] | We show that therecently observed pion invariant mass distribution of the phi ->pi0 pi0 gamma decay can be satisfactorily described by the chiral U(3) X U(3) Linear Sigma Model. |
hep-ph/9406336 | Passarino Giampiero | Giampiero Passarino | The Z Line-shape in the Standard Model | (Talk given at the 1994 Zeuthen Workshop on Elementary Particle
Theory). Latex, 5 pages (Figures upon request, GIAMPIERO@TO.INFN.IT) | Nucl.Phys.Proc.Suppl.37B:32,1994 | 10.1016/0920-5632(94)90657-2 | null | hep-ph | null | The status of the theoretical uncertainties for LEP1 observables associated
with the corresponding comparison among different codes is briefly reviewed.
| [
{
"created": "Fri, 17 Jun 1994 06:39:30 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Passarino",
"Giampiero",
""
]
] | The status of the theoretical uncertainties for LEP1 observables associated with the corresponding comparison among different codes is briefly reviewed. |
1307.4935 | Fabrizio Caola | Fabrizio Caola, Kirill Melnikov | Constraining the Higgs boson width with ZZ production at the LHC | 5 pages, 2 tables, 1 figure; v3: typos fixed in the arXiv abstract | Phys.Rev. D88 (2013) 054024 | 10.1103/PhysRevD.88.054024 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that existing measurements of $pp \to ZZ$ cross-section at the
LHC in a broad range of ZZ invariant masses allow one to derive a
model-independent upper bound on the Higgs boson width, thanks to strongly
enhanced off-shell Higgs contribution. Using CMS data and considering events in
the interval of ZZ invariant masses from 100 to 800 GeV, we find $\Gamma_H \le
38.8 \times \Gamma_H^{SM} \approx 163$ MeV, at the $95\%$ confidence level.
Restricting ZZ invariant masses to $M_{ZZ} \ge 300$ GeV range, we estimate that
this bound can be improved to $\Gamma_H \le 21 \times \Gamma_H^{SM} \approx 88$
MeV. Under the assumption that all couplings of the Higgs boson to Standard
Model particles scale in a universal way, our result can be translated into an
upper limit on the branching fraction of the Higgs boson decay to invisible
final states. We obtain $Br(H \to inv) < 0.84 (0.78)$, depending on the range
of ZZ invariant masses that are used to constrain the width. We believe that an
analysis along these lines should be performed by experimental collaborations
in the near future and also in the run II of the LHC. We estimate that such
analyses can, eventually, be sensitive to the Higgs boson width as small as
$\Gamma_H \sim 10 \times \Gamma_H^{SM}$.
| [
{
"created": "Thu, 18 Jul 2013 13:24:53 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2013 15:10:09 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Nov 2013 14:25:38 GMT",
"version": "v3"
}
] | 2013-11-04 | [
[
"Caola",
"Fabrizio",
""
],
[
"Melnikov",
"Kirill",
""
]
] | We point out that existing measurements of $pp \to ZZ$ cross-section at the LHC in a broad range of ZZ invariant masses allow one to derive a model-independent upper bound on the Higgs boson width, thanks to strongly enhanced off-shell Higgs contribution. Using CMS data and considering events in the interval of ZZ invariant masses from 100 to 800 GeV, we find $\Gamma_H \le 38.8 \times \Gamma_H^{SM} \approx 163$ MeV, at the $95\%$ confidence level. Restricting ZZ invariant masses to $M_{ZZ} \ge 300$ GeV range, we estimate that this bound can be improved to $\Gamma_H \le 21 \times \Gamma_H^{SM} \approx 88$ MeV. Under the assumption that all couplings of the Higgs boson to Standard Model particles scale in a universal way, our result can be translated into an upper limit on the branching fraction of the Higgs boson decay to invisible final states. We obtain $Br(H \to inv) < 0.84 (0.78)$, depending on the range of ZZ invariant masses that are used to constrain the width. We believe that an analysis along these lines should be performed by experimental collaborations in the near future and also in the run II of the LHC. We estimate that such analyses can, eventually, be sensitive to the Higgs boson width as small as $\Gamma_H \sim 10 \times \Gamma_H^{SM}$. |
1405.0083 | Defu Hou | Bing-Feng Jiang, Defu Hou, Jia-Rong Li | Polarization energy loss in hot viscous quark-gluon plasma | 9 pages, 6 figures in latex with a few references added and typos
fixed | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gluon polarization tensor for the quark-gluon plasma with shear viscosity
is derived with the viscous chromohydrodynamics. The longitudinal and
transverse dielectric functions are evaluated from the gluon polarization
tensor, through which the polarization energy loss suffered by a fast quark
traveling through the viscous quark-gluon plasma is investigated. The numerical
analysis indicates that shear viscosity significantly reduces the polarization
energy loss.
| [
{
"created": "Thu, 1 May 2014 03:29:57 GMT",
"version": "v1"
},
{
"created": "Mon, 19 May 2014 02:05:42 GMT",
"version": "v2"
}
] | 2014-05-20 | [
[
"Jiang",
"Bing-Feng",
""
],
[
"Hou",
"Defu",
""
],
[
"Li",
"Jia-Rong",
""
]
] | The gluon polarization tensor for the quark-gluon plasma with shear viscosity is derived with the viscous chromohydrodynamics. The longitudinal and transverse dielectric functions are evaluated from the gluon polarization tensor, through which the polarization energy loss suffered by a fast quark traveling through the viscous quark-gluon plasma is investigated. The numerical analysis indicates that shear viscosity significantly reduces the polarization energy loss. |
hep-ph/9805207 | null | A.A. Pankov and N. Paver | Model-independent limits on four-fermion contact interactions at LC with
polarization | 13 pages, LaTex | Phys.Lett.B432:159-166,1998 | 10.1016/S0370-2693(98)00619-4 | IC/98/40 | hep-ph | null | Fermion compositeness, and other types of new physics that can be described
by the exchange of very massive particles, can manifest themselves as the
result of an effective four-fermion contact interaction. In the case of the
processes $e^+e^-\to \mu^+\mu^-,\tau^+\tau^-,\bar{b}b$ and $\bar{c}c$ at future
$e^+e^-$ colliders with $\sqrt{s}=0.5-1$ TeV, we examine the sensitivity to
four-fermion contact interactions of two new integrated observables, $\sigma_+$
and $\sigma_-$, conveniently defined for such kind of analysis. We find that,
if longitudinal polarization of the electron beam were available, these
observables would offer the opportunity to separate the helicity cross sections
and, in this way, to derive model-independent bounds on the relevant
parameters.
| [
{
"created": "Fri, 1 May 1998 17:38:58 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Pankov",
"A. A.",
""
],
[
"Paver",
"N.",
""
]
] | Fermion compositeness, and other types of new physics that can be described by the exchange of very massive particles, can manifest themselves as the result of an effective four-fermion contact interaction. In the case of the processes $e^+e^-\to \mu^+\mu^-,\tau^+\tau^-,\bar{b}b$ and $\bar{c}c$ at future $e^+e^-$ colliders with $\sqrt{s}=0.5-1$ TeV, we examine the sensitivity to four-fermion contact interactions of two new integrated observables, $\sigma_+$ and $\sigma_-$, conveniently defined for such kind of analysis. We find that, if longitudinal polarization of the electron beam were available, these observables would offer the opportunity to separate the helicity cross sections and, in this way, to derive model-independent bounds on the relevant parameters. |
hep-ph/9807405 | Marco Stratmann | I. Bojak (Dortmund Univ.) and M. Stratmann (Durham Univ.) | Photoproduction of Heavy Quarks in Next-to-Leading Order QCD with
Longitudinally Polarized Initial States | 47 pages, LaTeX, 12 figures, uses amssymb, axodraw, and epsfig styles | Nucl.Phys.B540:345-381,1999 | 10.1016/S0550-3213(98)00751-2 | DO-TH 98/12, DTP/98/36 | hep-ph | null | We present all relevant details of our calculation of the complete
next-to-leading order (O(alpha_s^2 alpha)) QCD corrections to heavy flavor
photoproduction with longitudinally polarized point-like photons and hadrons.
In particular we provide analytical results for the virtual plus soft gluon
cross section. We carefully address the relevance of remaining theoretical
uncertainties by varying, for instance, the factorization and renormalization
scales independently. Such studies are of importance for a meaningful first
direct determination of the polarized gluon density Delta g from the total
charm production spin asymmetry by the upcoming COMPASS experiment. It is shown
that the scale uncertainty is considerably reduced in next-to-leading order,
but the dependence on the charm quark mass is sizable at fixed target energies.
Finally, we study several differential single-inclusive heavy quark
distributions and, for the polarized HERA option, the total bottom spin
asymmetry.
| [
{
"created": "Fri, 17 Jul 1998 14:52:48 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Bojak",
"I.",
"",
"Dortmund Univ."
],
[
"Stratmann",
"M.",
"",
"Durham Univ."
]
] | We present all relevant details of our calculation of the complete next-to-leading order (O(alpha_s^2 alpha)) QCD corrections to heavy flavor photoproduction with longitudinally polarized point-like photons and hadrons. In particular we provide analytical results for the virtual plus soft gluon cross section. We carefully address the relevance of remaining theoretical uncertainties by varying, for instance, the factorization and renormalization scales independently. Such studies are of importance for a meaningful first direct determination of the polarized gluon density Delta g from the total charm production spin asymmetry by the upcoming COMPASS experiment. It is shown that the scale uncertainty is considerably reduced in next-to-leading order, but the dependence on the charm quark mass is sizable at fixed target energies. Finally, we study several differential single-inclusive heavy quark distributions and, for the polarized HERA option, the total bottom spin asymmetry. |
hep-ph/0608230 | Igor Anikin | I.V. Anikin, O.V. Teryaev | Factorization and transverse momentum for two-hadron production in
inclusive $e^+ e^-$ annihilation | 14 pages, 3 figures. Version for PEPAN Letters | null | 10.1134/S1547477109010026 | CPHT- RR059.0706 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study factorization of processes involving two fragmentation functions in
the case of very small transverse momenta. We consider two-hadron production in
inclusive $e^+ e^-$ annihilation and demonstrate a new simple and illustrative
method of factorization for such processes including leading order $\alpha_S$
corrections.
| [
{
"created": "Mon, 21 Aug 2006 08:41:25 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2007 15:51:56 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jul 2008 10:49:49 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Aug 2008 10:57:35 GMT",
"version": "v4"
}
] | 2015-06-25 | [
[
"Anikin",
"I. V.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | We study factorization of processes involving two fragmentation functions in the case of very small transverse momenta. We consider two-hadron production in inclusive $e^+ e^-$ annihilation and demonstrate a new simple and illustrative method of factorization for such processes including leading order $\alpha_S$ corrections. |
hep-ph/0203237 | Hong-Jian He | Duane A. Dicus, Hong-Jian He, John N. Ng | Minimal Schemes for Large Neutrino Mixings with Inverted Hierarchy | Refs added | Phys.Lett. B536 (2002) 83-93 | 10.1016/S0370-2693(02)01818-X | UT-HEP-02-02 | hep-ph astro-ph hep-ex nucl-ex nucl-th | null | Existing oscillation data point to nonzero neutrino masses with large
mixings. We analyze the generic features of the neutrino Majorana mass matrix
with inverted hierarchy and construct realistic {\it minimal schemes} for the
neutrino mass matrix that can explain the large (but not maximal) \nu_e -
\nu_mu mixing of MSW-LAM as well as the nearly maximal \nu_mu - \nu_tau mixing
and the small (or negligible) \nu_e --> \nu_tau transition. These minimal
schemes are quite unique and turn out to be extremely predictive. Implications
for neutrinoless double beta decay, tritium beta decay and cosmology are
analyzed.
| [
{
"created": "Mon, 25 Mar 2002 20:47:38 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2002 03:25:15 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Apr 2002 05:22:41 GMT",
"version": "v3"
},
{
"created": "Fri, 17 May 2002 23:52:18 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Dicus",
"Duane A.",
""
],
[
"He",
"Hong-Jian",
""
],
[
"Ng",
"John N.",
""
]
] | Existing oscillation data point to nonzero neutrino masses with large mixings. We analyze the generic features of the neutrino Majorana mass matrix with inverted hierarchy and construct realistic {\it minimal schemes} for the neutrino mass matrix that can explain the large (but not maximal) \nu_e - \nu_mu mixing of MSW-LAM as well as the nearly maximal \nu_mu - \nu_tau mixing and the small (or negligible) \nu_e --> \nu_tau transition. These minimal schemes are quite unique and turn out to be extremely predictive. Implications for neutrinoless double beta decay, tritium beta decay and cosmology are analyzed. |
2401.14899 | Wei-Lin Wu | Wei-Lin Wu, Yan-Ke Chen, Lu Meng, Shi-Lin Zhu | Benchmark calculations of fully heavy compact and molecular tetraquark
states | 16 pages, 6 figures, 10 tables. Version accepted by PRD | Phys. Rev. D 109, 054034 (2024) | 10.1103/PhysRevD.109.054034 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the mass spectrum of the S-wave fully heavy tetraquark systems $
QQ\bar Q\bar Q~(Q=c,b) $ with both normal $ (J^{PC}=0^{++},1^{+-},2^{++}) $ and
exotic $ (J^{PC}=0^{+-},1^{++},2^{+-}) $ C-parities using three different quark
potential models (AL1, AP1, BGS). The exotic C-parity systems refer to the ones
that cannot be composed of two S-wave ground heavy quarkonia. We incorporate
the molecular dimeson and compact diquark-antidiquark spatial correlations
simultaneously, thereby discerning the actual configurations of the states. We
employ the Gaussian expansion method to solve the four-body Schr\"odinger
equation, and the complex scaling method to identify the resonant states. The
mass spectra in three different models qualitatively agree with each other. We
obtain several resonant states with $ J^{PC} = 0^{++}, 1^{+-}, 2^{++}, 1^{++} $
in the mass region $(6.92,7.30)\, \mathrm{GeV}$, some of which are good
candidates of the experimentally observed $X(6900)$ and $X(7200)$. We also
obtain several exotic C-parity zero-width states with $ J^{PC}=0^{+-} $ and $
2^{+-} $. These zero-width states have no corresponding S-wave diquarkonium
threshold and can only decay strongly to final states with P-wave quarkonia.
With the notation $T_{4Q,J(C)}(M)$, we deduce from the root mean square radii
that the $ X(7200) $ candidates $ T_{4c,0(+)}(7173), T_{4c,2(+)}(7214) $ and
the state $ T_{4c,1(-)}(7191) $ look like molecular states although most of the
resonant and zero-width states are compact states.
| [
{
"created": "Fri, 26 Jan 2024 14:28:17 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Feb 2024 05:38:59 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Mar 2024 08:52:41 GMT",
"version": "v3"
}
] | 2024-03-27 | [
[
"Wu",
"Wei-Lin",
""
],
[
"Chen",
"Yan-Ke",
""
],
[
"Meng",
"Lu",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We calculate the mass spectrum of the S-wave fully heavy tetraquark systems $ QQ\bar Q\bar Q~(Q=c,b) $ with both normal $ (J^{PC}=0^{++},1^{+-},2^{++}) $ and exotic $ (J^{PC}=0^{+-},1^{++},2^{+-}) $ C-parities using three different quark potential models (AL1, AP1, BGS). The exotic C-parity systems refer to the ones that cannot be composed of two S-wave ground heavy quarkonia. We incorporate the molecular dimeson and compact diquark-antidiquark spatial correlations simultaneously, thereby discerning the actual configurations of the states. We employ the Gaussian expansion method to solve the four-body Schr\"odinger equation, and the complex scaling method to identify the resonant states. The mass spectra in three different models qualitatively agree with each other. We obtain several resonant states with $ J^{PC} = 0^{++}, 1^{+-}, 2^{++}, 1^{++} $ in the mass region $(6.92,7.30)\, \mathrm{GeV}$, some of which are good candidates of the experimentally observed $X(6900)$ and $X(7200)$. We also obtain several exotic C-parity zero-width states with $ J^{PC}=0^{+-} $ and $ 2^{+-} $. These zero-width states have no corresponding S-wave diquarkonium threshold and can only decay strongly to final states with P-wave quarkonia. With the notation $T_{4Q,J(C)}(M)$, we deduce from the root mean square radii that the $ X(7200) $ candidates $ T_{4c,0(+)}(7173), T_{4c,2(+)}(7214) $ and the state $ T_{4c,1(-)}(7191) $ look like molecular states although most of the resonant and zero-width states are compact states. |
0806.3804 | Aram Kotzinian | Aram Kotzinian | SIDIS Asymmetries in Quark-Diquark Model | to appear in proceedings of Transversity 2008 Workshop, May 28-31
2008, Ferrara (Italy). In V2 Fig. 1. is corrected | null | 10.1142/9789814277785_0029 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some properties of intrinsic transverse momentum dependent nucleon
distribution functions are considered in the simple quark-diquark model. The
transverse target polarization dependent asymmetries for SIDIS are calculated
and compared with recent results of COMPASS. The model describes well the
measured asymmetries. Generalization of quark-diquark model for Sivers function
is discussed.
| [
{
"created": "Tue, 24 Jun 2008 16:06:02 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 2008 17:34:30 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Kotzinian",
"Aram",
""
]
] | Some properties of intrinsic transverse momentum dependent nucleon distribution functions are considered in the simple quark-diquark model. The transverse target polarization dependent asymmetries for SIDIS are calculated and compared with recent results of COMPASS. The model describes well the measured asymmetries. Generalization of quark-diquark model for Sivers function is discussed. |
2307.09640 | Gojko Vujanovic | G. Vujanovic, A. Angerami, R. Arora, S. A. Bass, S. Cao, Y. Chen, T.
Dai, L. Du, R. Ehlers, H. Elfner, W. Fan, R. J. Fries, C. Gale, Y. He, M.
Heffernan, U. Heinz, B. V. Jacak, P. M. Jacobs, S. Jeon, Y. Ji, L. Kasper, M.
Kordell II, A. Kumar, J. Latessa, Y.-J. Lee, R. Lemmon, D. Liyanage, A.
Lopez, M. Luzum, A. Majumder, S. Mak, A. Mankolli, C. Martin, H. Mehryar, T.
Mengel, J. Mulligan, C. Nattrass, J. Norman, J.-F. Paquet, C. Parker, J. H.
Putschke, G. Roland, B. Schenke, L. Schwiebert, A. Sengupta, C. Shen, C.
Sirimanna, D. Soeder, R. A. Soltz, I. Soudi, M. Strickland, Y. Tachibana, J.
Velkovska, X.-N. Wang, and W. Zhao (the JETSCAPE Collaboration) | Multiscale evolution of heavy flavor in the QGP | 6 pages, 3 figures, contribution to the Hard Probes 2023 proceedings | null | null | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | Shower development dynamics for a jet traveling through the quark-gluon
plasma (QGP) is a multiscale process, where the heavy flavor mass is an
important scale. During the high virtuality portion of the jet evolution in the
QGP, emission of gluons from a heavy flavor is modified owing to heavy quark
mass. Medium-induced radiation of heavy flavor is sensitive to microscopic
processes (e.g. diffusion), whose virtuality dependence is phenomenologically
explored in this study. In the lower virtuality part of shower evolution, i.e.
when the mass is comparable to the virtuality of the parton, scattering and
radiation processes of heavy quarks differ from light quarks. The effects of
these mechanisms on shower development in heavy flavor tagged showers in the
QGP is explored here. Furthermore, this multiscale study examines dynamical
pair production of heavy flavor (via virtual gluon splittings) and their
subsequent evolution in the QGP, which is not possible otherwise. A realistic
event-by-event simulation is performed using the JETSCAPE framework.
Energy-momentum exchange with the medium proceeds using a weak coupling recoil
approach. Using leading hadron and open heavy flavor observables, differences
in heavy versus light quark energy-loss mechanisms are explored, while the
importance of heavy flavor pair production is highlighted along with future
directions to study.
| [
{
"created": "Tue, 18 Jul 2023 21:08:05 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2023 22:27:55 GMT",
"version": "v2"
}
] | 2023-10-31 | [
[
"Vujanovic",
"G.",
"",
"the JETSCAPE Collaboration"
],
[
"Angerami",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Arora",
"R.",
"",
"the JETSCAPE Collaboration"
],
[
"Bass",
"S. A.",
"",
"the JETSCAPE Collaboration"
],
[
"Cao",
... | Shower development dynamics for a jet traveling through the quark-gluon plasma (QGP) is a multiscale process, where the heavy flavor mass is an important scale. During the high virtuality portion of the jet evolution in the QGP, emission of gluons from a heavy flavor is modified owing to heavy quark mass. Medium-induced radiation of heavy flavor is sensitive to microscopic processes (e.g. diffusion), whose virtuality dependence is phenomenologically explored in this study. In the lower virtuality part of shower evolution, i.e. when the mass is comparable to the virtuality of the parton, scattering and radiation processes of heavy quarks differ from light quarks. The effects of these mechanisms on shower development in heavy flavor tagged showers in the QGP is explored here. Furthermore, this multiscale study examines dynamical pair production of heavy flavor (via virtual gluon splittings) and their subsequent evolution in the QGP, which is not possible otherwise. A realistic event-by-event simulation is performed using the JETSCAPE framework. Energy-momentum exchange with the medium proceeds using a weak coupling recoil approach. Using leading hadron and open heavy flavor observables, differences in heavy versus light quark energy-loss mechanisms are explored, while the importance of heavy flavor pair production is highlighted along with future directions to study. |
1108.5654 | Marat Siddikov Ilfatovich | B. Z. Kopeliovich, Ivan Schmidt, M. Siddikov | Nonperturbative features of the axial current | 22 pages, 10 Figures, improved and extended presentation. We provide
a code which can be used for evaluations of the distribution amplitudes (see
"Ancillary files" attached to this arXiv preprint) | Nucl. Phys. A 918 (2013), 41 | 10.1016/j.nuclphysa.2013.09.009 | USM-TH-292 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nonperturbative structure of the axial current and evaluate the
two-point light-cone distribution amplitudes (DA) associated with the
correlator \int d\xi
exp(-iq\xi)<0|\bar{\psi}(x)\Gamma\psi(y)J_{\mu}^{5}(\xi)|0> within the
instanton vacuum model in the leading order in O(1/N_c). Due to the built-in
chiral symmetry, four of eight axial DAs are related to that for pions.
Knowledge of these nonperturbative objects is important for phenomenological
study of high-energy neutrino interactions and semileptonic decays of heavy
quarks. We provide a code for evaluation of these DAs and an interpolation
formula valid in the region Q^2 < 1 GeV^2.
| [
{
"created": "Mon, 29 Aug 2011 17:04:34 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Nov 2012 14:41:39 GMT",
"version": "v2"
}
] | 2013-10-16 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Siddikov",
"M.",
""
]
] | We study the nonperturbative structure of the axial current and evaluate the two-point light-cone distribution amplitudes (DA) associated with the correlator \int d\xi exp(-iq\xi)<0|\bar{\psi}(x)\Gamma\psi(y)J_{\mu}^{5}(\xi)|0> within the instanton vacuum model in the leading order in O(1/N_c). Due to the built-in chiral symmetry, four of eight axial DAs are related to that for pions. Knowledge of these nonperturbative objects is important for phenomenological study of high-energy neutrino interactions and semileptonic decays of heavy quarks. We provide a code for evaluation of these DAs and an interpolation formula valid in the region Q^2 < 1 GeV^2. |
2207.13567 | Simone Marzani | Daniele Gaggero, Andrea Ghira, Simone Marzani, Giovanni Ridolfi | Soft logarithms in processes with heavy quarks | 23 pages, 3 figures; version published in JHEP (plus a minus sign
corrected in Eq. (4.1)) | JHEP 09 (2022) 58 | 10.1007/JHEP09(2022)058 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observables involving heavy quarks can be computed in perturbative QCD in two
different approximation schemes: either the quark mass dependence is fully
retained, or it is retained only where needed to regulate the collinear
singularity. The two schemes have different advantages and drawbacks. In
particular, it is known that the structure of large logarithms arising from
soft emissions is different in the two approaches. We investigate the origin of
this difference in some detail, focussing on a few specific processes. We show
that it is related to the non-commutativity of the small-mass and soft-emission
limits. Finally, we perform the resummation of soft-emission logarithms to
next-to-leading accuracy in the case of Higgs decay into a $b\bar b$ pair, in
the scheme in which the quark mass dependence is fully accounted for.
| [
{
"created": "Wed, 27 Jul 2022 15:03:30 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Sep 2022 09:38:11 GMT",
"version": "v2"
}
] | 2022-09-12 | [
[
"Gaggero",
"Daniele",
""
],
[
"Ghira",
"Andrea",
""
],
[
"Marzani",
"Simone",
""
],
[
"Ridolfi",
"Giovanni",
""
]
] | Observables involving heavy quarks can be computed in perturbative QCD in two different approximation schemes: either the quark mass dependence is fully retained, or it is retained only where needed to regulate the collinear singularity. The two schemes have different advantages and drawbacks. In particular, it is known that the structure of large logarithms arising from soft emissions is different in the two approaches. We investigate the origin of this difference in some detail, focussing on a few specific processes. We show that it is related to the non-commutativity of the small-mass and soft-emission limits. Finally, we perform the resummation of soft-emission logarithms to next-to-leading accuracy in the case of Higgs decay into a $b\bar b$ pair, in the scheme in which the quark mass dependence is fully accounted for. |
2307.11165 | Adam Freese | Adam Freese and Gerald A. Miller | Synchronization effects on rest frame energy and momentum densities in
the proton | 23 pages, 5 figures, to be published in Physical Review D | null | null | JLAB-THY-23-3889, NT@UW-23-10 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain two-dimensional relativistic densities and currents of energy and
momentum in a proton at rest. These densities are obtained at surfaces of fixed
light front time, which physically corresponds to using an alternative
synchronization convention. Mathematically, this is done using tilted light
front coordinates, which consist of light front time and ordinary spatial
coordinates. In this coordinate system, all sixteen components of the
energy-momentum tensor obtain clear physical interpretations, and the nine
Galilean components reproduce results from standard light front coordinates. We
find angular modulations in several densities that are absent in the
corresponding instant form results, which are explained as optical effects
arising from using fixed light front time when motion is present within the
target. Additionally, transversely-polarized spin-half targets exhibit an
energy dipole moment -- which evaluates to $-1/4$ for all targets if the
Belinfante EMT is used, but which is target dependent and vanishes for
pointlike fermions if the asymmetric EMT is instead used.
| [
{
"created": "Thu, 20 Jul 2023 18:01:10 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Oct 2023 19:54:27 GMT",
"version": "v2"
}
] | 2023-11-01 | [
[
"Freese",
"Adam",
""
],
[
"Miller",
"Gerald A.",
""
]
] | We obtain two-dimensional relativistic densities and currents of energy and momentum in a proton at rest. These densities are obtained at surfaces of fixed light front time, which physically corresponds to using an alternative synchronization convention. Mathematically, this is done using tilted light front coordinates, which consist of light front time and ordinary spatial coordinates. In this coordinate system, all sixteen components of the energy-momentum tensor obtain clear physical interpretations, and the nine Galilean components reproduce results from standard light front coordinates. We find angular modulations in several densities that are absent in the corresponding instant form results, which are explained as optical effects arising from using fixed light front time when motion is present within the target. Additionally, transversely-polarized spin-half targets exhibit an energy dipole moment -- which evaluates to $-1/4$ for all targets if the Belinfante EMT is used, but which is target dependent and vanishes for pointlike fermions if the asymmetric EMT is instead used. |
1409.1709 | Ryo Nagai | Ryo Nagai, Masaharu Tanabashi, Koji Tsumura | Does unitarity imply finiteness of electroweak oblique corrections at
one-loop? - constraining extra neutral Higgs bosons - | 29 pages, 10 figures, added reference; version accepted for
publication in Phys.Rev. D | Phys. Rev. D 91, 034030 (2015) | 10.1103/PhysRevD.91.034030 | KUNS-2512 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Introducing arbitrary number of neutral Higgs bosons in the electroweak
symmetry breaking sector, we derive a set of conditions among Higgs couplings
which need to be satisfied to maintain the unitarity of the high energy
scattering amplitudes of weak gauge bosons at the tree level (unitarity sum
rules). It is shown that the unitarity sum rules require the tree level $\rho$
parameter to be 1, without explicitly invoking the custodial symmetry
arguments. The one-loop finiteness of the electroweak oblique corrections is
automatically guaranteed once these unitarity sum rules are imposed among Higgs
couplings. Severe constraints on the lightest Higgs coupling (125GeV Higgs
coupling) and the mass of the second lightest Higgs boson are obtained from the
unitarity and the results of the electroweak precision tests (oblique parameter
measurements). These results are compared with the effective theory of the
light Higgs boson, and we find simple relationships between the mass of the
second lightest Higgs boson in our framework and the ultraviolet cutoff in the
effective theory framework.
| [
{
"created": "Fri, 5 Sep 2014 09:49:45 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2014 04:54:24 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Jan 2015 01:37:57 GMT",
"version": "v3"
}
] | 2015-03-05 | [
[
"Nagai",
"Ryo",
""
],
[
"Tanabashi",
"Masaharu",
""
],
[
"Tsumura",
"Koji",
""
]
] | Introducing arbitrary number of neutral Higgs bosons in the electroweak symmetry breaking sector, we derive a set of conditions among Higgs couplings which need to be satisfied to maintain the unitarity of the high energy scattering amplitudes of weak gauge bosons at the tree level (unitarity sum rules). It is shown that the unitarity sum rules require the tree level $\rho$ parameter to be 1, without explicitly invoking the custodial symmetry arguments. The one-loop finiteness of the electroweak oblique corrections is automatically guaranteed once these unitarity sum rules are imposed among Higgs couplings. Severe constraints on the lightest Higgs coupling (125GeV Higgs coupling) and the mass of the second lightest Higgs boson are obtained from the unitarity and the results of the electroweak precision tests (oblique parameter measurements). These results are compared with the effective theory of the light Higgs boson, and we find simple relationships between the mass of the second lightest Higgs boson in our framework and the ultraviolet cutoff in the effective theory framework. |
2307.16063 | Mandeep Kaur | Mandeep Kaur, Maguni Mahakhud, Ambresh Shivaji, Xiaoran Zhao | QCD corrections to the Golden decay channel of the Higgs boson | 21 pages, 10 figures | null | null | null | hep-ph hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | Future colliders aim to provide highly precise experimental measurements of
the properties of the Higgs boson. In order to benefit from these precision
machines, theoretical errors in the Higgs sector observables have to match at
least the experimental uncertainties. The theoretical uncertainties in the
Higgs sector observables can be reduced by including missing higher-order terms
in their perturbative calculations. In this direction, we compute the mixed
QCD-electroweak corrections at ${\mathcal O}(\alpha \alpha_s)$ to the Higgs
decay into four charged leptons by considering the golden decay channel, $ H
\to e^+e^-\mu^+\mu^-$. Due to color conservation, these corrections receive
contributions only from the two-loop virtual diagrams. In the complex mass
scheme, we find that the mixed QCD-electroweak corrections to the partial decay
width, relative to the leading order predictions, are positive and about
$0.27\%$ for $\alpha_s(M_Z)$. Relative to the next-to-leading order electroweak
corrections, the mixed QCD-electroweak corrections are found to be
approximately $18\%$ for $\alpha_s(M_Z)$. With respect to the leading order, we
observe a flat effect of the mixed QCD-electroweak corrections on the invariant
mass distribution of the lepton pairs with fixed QCD coupling. The $\phi$
distribution, due to the mixed QCD-electroweak corrections, follows a $(1-\cos
\phi)$ dependence.
| [
{
"created": "Sat, 29 Jul 2023 19:49:27 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2024 12:22:03 GMT",
"version": "v2"
}
] | 2024-03-21 | [
[
"Kaur",
"Mandeep",
""
],
[
"Mahakhud",
"Maguni",
""
],
[
"Shivaji",
"Ambresh",
""
],
[
"Zhao",
"Xiaoran",
""
]
] | Future colliders aim to provide highly precise experimental measurements of the properties of the Higgs boson. In order to benefit from these precision machines, theoretical errors in the Higgs sector observables have to match at least the experimental uncertainties. The theoretical uncertainties in the Higgs sector observables can be reduced by including missing higher-order terms in their perturbative calculations. In this direction, we compute the mixed QCD-electroweak corrections at ${\mathcal O}(\alpha \alpha_s)$ to the Higgs decay into four charged leptons by considering the golden decay channel, $ H \to e^+e^-\mu^+\mu^-$. Due to color conservation, these corrections receive contributions only from the two-loop virtual diagrams. In the complex mass scheme, we find that the mixed QCD-electroweak corrections to the partial decay width, relative to the leading order predictions, are positive and about $0.27\%$ for $\alpha_s(M_Z)$. Relative to the next-to-leading order electroweak corrections, the mixed QCD-electroweak corrections are found to be approximately $18\%$ for $\alpha_s(M_Z)$. With respect to the leading order, we observe a flat effect of the mixed QCD-electroweak corrections on the invariant mass distribution of the lepton pairs with fixed QCD coupling. The $\phi$ distribution, due to the mixed QCD-electroweak corrections, follows a $(1-\cos \phi)$ dependence. |
hep-ph/0207334 | Martin Hirsch | M. Hirsch, W. Porod, J.C. Romao and J.W.F. Valle | Probing neutrino properties with charged scalar lepton decays | 24 pages, 8 ps figs Report-no.: IFIC/02-33 and ZU-TH 11/02 | Phys.Rev.D66:095006,2002 | 10.1103/PhysRevD.66.095006 | null | hep-ph | null | Supersymmetry with bilinear R-parity violation provides a predictive
framework for neutrino masses and mixings in agreement with current neutrino
oscillation data. The model leads to striking signals at future colliders
through the R-parity violating decays of the lightest supersymmetric particle.
Here we study charged scalar lepton decays and demonstrate that if the scalar
tau is the LSP (i) it will decay within the detector, despite the smallness of
the neutrino masses, (ii) the relative ratio of branching ratios Br({tilde
tau}_1 --> e sum nu_i)/ Br({tilde tau}_1 --> mu sum nu_i) is predicted from the
measured solar neutrino angle, and (iii) scalar muon and scalar electron decays
will allow to test the consistency of the model. Thus, bilinear R-parity
breaking SUSY will be testable at future colliders also in the case where the
LSP is not the neutralino.
| [
{
"created": "Mon, 29 Jul 2002 16:36:38 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Hirsch",
"M.",
""
],
[
"Porod",
"W.",
""
],
[
"Romao",
"J. C.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | Supersymmetry with bilinear R-parity violation provides a predictive framework for neutrino masses and mixings in agreement with current neutrino oscillation data. The model leads to striking signals at future colliders through the R-parity violating decays of the lightest supersymmetric particle. Here we study charged scalar lepton decays and demonstrate that if the scalar tau is the LSP (i) it will decay within the detector, despite the smallness of the neutrino masses, (ii) the relative ratio of branching ratios Br({tilde tau}_1 --> e sum nu_i)/ Br({tilde tau}_1 --> mu sum nu_i) is predicted from the measured solar neutrino angle, and (iii) scalar muon and scalar electron decays will allow to test the consistency of the model. Thus, bilinear R-parity breaking SUSY will be testable at future colliders also in the case where the LSP is not the neutralino. |
hep-ph/0207270 | Rogerio Rosenfeld | A. Zerwekh (UTFSM), C. Dib (UTSFM) and R. Rosenfeld (IFT/Unesp) | Triple Photon Production at the Tevatron in Technicolor Models | 14 pages, 5 figures | Phys.Lett. B549 (2002) 154-158 | 10.1016/S0370-2693(02)02896-4 | null | hep-ph | null | We study the process p bar{p} --> gamma gamma gamma as a signal for
associated photon-technipion production at the Tevatron. This is a clean
signature with relatively low background. Resonant and non-resonant
contributions are included and we show that technicolor models can be
effectively probed in this mode.
| [
{
"created": "Mon, 22 Jul 2002 21:36:50 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Zerwekh",
"A.",
"",
"UTFSM"
],
[
"Dib",
"C.",
"",
"UTSFM"
],
[
"Rosenfeld",
"R.",
"",
"IFT/Unesp"
]
] | We study the process p bar{p} --> gamma gamma gamma as a signal for associated photon-technipion production at the Tevatron. This is a clean signature with relatively low background. Resonant and non-resonant contributions are included and we show that technicolor models can be effectively probed in this mode. |
2008.01096 | Yohei Ema | Yohei Ema, Kyohei Mukaida, Jorinde van de Vis | Renormalization Group Equations of Higgs-$R^2$ Inflation | 35 pages, 1 figure; v2: references added, version accepted by JHEP | null | 10.1007/JHEP02(2021)109 | DESY 20-130 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive one- and two-loop renormalization group equations (RGEs) of
Higgs-$R^2$ inflation. This model has a non-minimal coupling between the Higgs
and the Ricci scalar and a Ricci scalar squared term on top of the standard
model. The RGEs derived in this paper are valid as long as the energy scale of
interest (in the Einstein frame) is below the Planck scale. We also discuss
implications to the inflationary predictions and the electroweak vacuum
metastability.
| [
{
"created": "Mon, 3 Aug 2020 18:00:05 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jan 2021 13:53:24 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"Ema",
"Yohei",
""
],
[
"Mukaida",
"Kyohei",
""
],
[
"van de Vis",
"Jorinde",
""
]
] | We derive one- and two-loop renormalization group equations (RGEs) of Higgs-$R^2$ inflation. This model has a non-minimal coupling between the Higgs and the Ricci scalar and a Ricci scalar squared term on top of the standard model. The RGEs derived in this paper are valid as long as the energy scale of interest (in the Einstein frame) is below the Planck scale. We also discuss implications to the inflationary predictions and the electroweak vacuum metastability. |
hep-ph/0612357 | Salah Nasri | K. S. Babu, R. N. Mohapatra, S. Nasri | Unified TeV Scale Picture of Baryogenesis and Dark Matter | 10 pages, one reference updated. Version to appear in Phys. Rev. Lett | Phys.Rev.Lett.98:161301,2007 | 10.1103/PhysRevLett.98.161301 | UFIFT-HEP-06-20, OSU-HEP-06-14 | hep-ph | null | We present a simple extension of MSSM which provides a unified picture of
cosmological baryon asymmetry and dark matter. Our model introduces a gauge
singlet field $N$ and a color triplet field $X$ which couple to the
right--handed quark fields. The out--of equilibrium decay of the Majorana
fermion $N$ mediated by the exchange of the scalar field $X$ generates adequate
baryon asymmetry for $M_N \sim 100$ GeV and $M_X \sim$ TeV. The scalar partner
of $N$ (denoted $\tilde{N}_1$) is naturally the lightest SUSY particle as it
has no gauge interactions and plays the role of dark matter. $\tilde{N}_1$
annihilates into quarks efficiently in the early universe via the exchange of
the fermionic $\tilde{X}$ field. The model is experimentally testable in (i)
neutron--antineutron oscillations with a transition time estimated to be around
$10^{10}$ sec, (ii) discovery of colored particles $X$ at LHC with mass of
order TeV, and (iii) direct dark matter detection with a predicted cross
section in the observable range.
| [
{
"created": "Thu, 28 Dec 2006 16:41:02 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jan 2007 05:16:50 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Mar 2007 17:04:08 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Babu",
"K. S.",
""
],
[
"Mohapatra",
"R. N.",
""
],
[
"Nasri",
"S.",
""
]
] | We present a simple extension of MSSM which provides a unified picture of cosmological baryon asymmetry and dark matter. Our model introduces a gauge singlet field $N$ and a color triplet field $X$ which couple to the right--handed quark fields. The out--of equilibrium decay of the Majorana fermion $N$ mediated by the exchange of the scalar field $X$ generates adequate baryon asymmetry for $M_N \sim 100$ GeV and $M_X \sim$ TeV. The scalar partner of $N$ (denoted $\tilde{N}_1$) is naturally the lightest SUSY particle as it has no gauge interactions and plays the role of dark matter. $\tilde{N}_1$ annihilates into quarks efficiently in the early universe via the exchange of the fermionic $\tilde{X}$ field. The model is experimentally testable in (i) neutron--antineutron oscillations with a transition time estimated to be around $10^{10}$ sec, (ii) discovery of colored particles $X$ at LHC with mass of order TeV, and (iii) direct dark matter detection with a predicted cross section in the observable range. |
hep-ph/9806474 | Alan R. White | Alan. R. White | Solving QCD Using Multi-Regge Theory | 12 pages, with 11 PS figures in the text. Talk presented at the third
workshop on ``Continuous Advances in QCD'' University of Minnesota,
Minneapolis, April 16-19, 1998 | null | null | ANL-HEP-CP-98-67 | hep-ph | null | This talk outlines the derivation of a high-energy, transverse momentum
cut-off, solution of QCD in which the Regge pole and ``single gluon''
properties of the pomeron are directly related to the confinement and chiral
symmetry breaking properties of the hadron spectrum. In first approximation,
the pomeron is a single reggeized gluon plus a ``wee parton'' component that
compensates for the color and particle properties of the gluon. This solution
corresponds to a supercritical phase of Reggeon Field Theory.
| [
{
"created": "Wed, 24 Jun 1998 22:39:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"White",
"Alan. R.",
""
]
] | This talk outlines the derivation of a high-energy, transverse momentum cut-off, solution of QCD in which the Regge pole and ``single gluon'' properties of the pomeron are directly related to the confinement and chiral symmetry breaking properties of the hadron spectrum. In first approximation, the pomeron is a single reggeized gluon plus a ``wee parton'' component that compensates for the color and particle properties of the gluon. This solution corresponds to a supercritical phase of Reggeon Field Theory. |
2109.03244 | Andrea Caputo | Andrea Caputo, Georg Raffelt and Edoardo Vitagliano | Muonic Boson Limits: Supernova Redux | 30 pages, 12 figures; minor changes on the text and references,
published version | null | 10.1103/PhysRevD.105.035022 | MPP-2021-154 | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://creativecommons.org/publicdomain/zero/1.0/ | We derive supernova (SN) bounds on muon-philic bosons, taking advantage of
the recent emergence of muonic SN models. Our main innovations are to consider
scalars $\phi$ in addition to pseudoscalars $a$ and to include systematically
the generic two-photon coupling $G_{\gamma\gamma}$ implied by a muon triangle
loop. This interaction allows for Primakoff scattering and radiative boson
decays. The globular-cluster bound $G_{\gamma\gamma}<0.67\times10^{-10}~{\rm
GeV}^{-1}$ derived for axion-like particles carries over to the muonic Yukawa
couplings as $g_a<3.1\times10^{-9}$ and $g_\phi< 4.6\times10^{-9}$ for
$m_{a,\phi}\lesssim 100$ keV, so SN arguments become interesting mainly for
larger masses. If bosons escape freely from the SN core the main constraints
originate from SN1987A $\gamma$ rays and the diffuse cosmic $\gamma$-ray
background. The latter allows at most $10^{-4}$ of a typical total SN energy of
$E_{\rm SN}\simeq3\times10^{53}$erg to show up as $\gamma$ rays, for
$m_{a,\phi}\gtrsim 100$keV implying $g_a \lesssim 0.9\times10^{-10}$ and
$g_\phi \lesssim 0.4\times10^{-10}$. In the trapping regime the bosons emerge
as quasi-thermal radiation from a region near the neutrino sphere and match
$L_\nu$ for $g_{a,\phi}\simeq 10^{-4}$. However, the $2\gamma$ decay is so fast
that all the energy is dumped into the surrounding progenitor-star matter,
whereas at most $10^{-2}E_{\rm SN}$ may show up in the explosion. To suppress
boson emission below this level we need yet larger couplings, $g_{a}\gtrsim
2\times10^{-3}$ and $g_{\phi}\gtrsim 4\times10^{-3}$. Muonic scalars can
explain the muon magnetic-moment anomaly for $g_{\phi}\simeq 0.4\times10^{-3}$,
a value hard to reconcile with SN physics despite the uncertainty of the
explosion-energy bound. For generic axion-like particles, this argument covers
the "cosmological triangle" in the $G_{a\gamma\gamma}$--$m_a$ parameter space.
| [
{
"created": "Tue, 7 Sep 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2022 10:12:54 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Caputo",
"Andrea",
""
],
[
"Raffelt",
"Georg",
""
],
[
"Vitagliano",
"Edoardo",
""
]
] | We derive supernova (SN) bounds on muon-philic bosons, taking advantage of the recent emergence of muonic SN models. Our main innovations are to consider scalars $\phi$ in addition to pseudoscalars $a$ and to include systematically the generic two-photon coupling $G_{\gamma\gamma}$ implied by a muon triangle loop. This interaction allows for Primakoff scattering and radiative boson decays. The globular-cluster bound $G_{\gamma\gamma}<0.67\times10^{-10}~{\rm GeV}^{-1}$ derived for axion-like particles carries over to the muonic Yukawa couplings as $g_a<3.1\times10^{-9}$ and $g_\phi< 4.6\times10^{-9}$ for $m_{a,\phi}\lesssim 100$ keV, so SN arguments become interesting mainly for larger masses. If bosons escape freely from the SN core the main constraints originate from SN1987A $\gamma$ rays and the diffuse cosmic $\gamma$-ray background. The latter allows at most $10^{-4}$ of a typical total SN energy of $E_{\rm SN}\simeq3\times10^{53}$erg to show up as $\gamma$ rays, for $m_{a,\phi}\gtrsim 100$keV implying $g_a \lesssim 0.9\times10^{-10}$ and $g_\phi \lesssim 0.4\times10^{-10}$. In the trapping regime the bosons emerge as quasi-thermal radiation from a region near the neutrino sphere and match $L_\nu$ for $g_{a,\phi}\simeq 10^{-4}$. However, the $2\gamma$ decay is so fast that all the energy is dumped into the surrounding progenitor-star matter, whereas at most $10^{-2}E_{\rm SN}$ may show up in the explosion. To suppress boson emission below this level we need yet larger couplings, $g_{a}\gtrsim 2\times10^{-3}$ and $g_{\phi}\gtrsim 4\times10^{-3}$. Muonic scalars can explain the muon magnetic-moment anomaly for $g_{\phi}\simeq 0.4\times10^{-3}$, a value hard to reconcile with SN physics despite the uncertainty of the explosion-energy bound. For generic axion-like particles, this argument covers the "cosmological triangle" in the $G_{a\gamma\gamma}$--$m_a$ parameter space. |
1708.09799 | Vladimir Baryshevsky | V.G. Baryshevsky | On the search for the electric dipole moment of strange and charm
baryons at LHC and parity violating (P) and time reversal (T) invariance
violating spin rotation and dichroism in crystal | 18 pages, 2 .eps figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a bent crystal the $P$-odd effect of short-lived baryon spin rotation
could imitate spin rotation caused by assumed EDM. Use of different behavior of
$P$-odd and $T$-odd spin rotations at crystal turning around the direction of
particle momentum makes it possible to exclude $P$-odd rotation contribution,
when measuring short-lived baryons EDM. Subtraction of the measurement results
for angle ranges $\varphi$ and $\varphi + \pi$ from each other enables
measuring $T$-odd rotation at scattering of negatively charged beauty and
neutral baryons by axes of unbent crystal.
| [
{
"created": "Thu, 31 Aug 2017 16:32:02 GMT",
"version": "v1"
}
] | 2017-09-01 | [
[
"Baryshevsky",
"V. G.",
""
]
] | In a bent crystal the $P$-odd effect of short-lived baryon spin rotation could imitate spin rotation caused by assumed EDM. Use of different behavior of $P$-odd and $T$-odd spin rotations at crystal turning around the direction of particle momentum makes it possible to exclude $P$-odd rotation contribution, when measuring short-lived baryons EDM. Subtraction of the measurement results for angle ranges $\varphi$ and $\varphi + \pi$ from each other enables measuring $T$-odd rotation at scattering of negatively charged beauty and neutral baryons by axes of unbent crystal. |
hep-ph/0303114 | Csaba Balazs | Howard Baer and Csaba Balazs | Chi**2 analysis of the minimal supergravity model including WMAP,
g(mu)-2 and b -> s gamma constraints | 8 pages, 3 figures. JCAP version. A copy of the paper with better
resolution figures can be found at
http://www.hep.fsu.edu/~balazs/Physics/Papers/2003/ | JCAP0305:006,2003 | 10.1088/1475-7516/2003/05/006 | FSU-HEP-030313 | hep-ph astro-ph | null | Recent results from the WMAP measurements of the cosmic background radiation
yield very tight constraints on the relic density of supersymmetric cold dark
matter. We combine the WMAP constraint with those from the anomalous magnetic
moment of the muon and the b -> s gamma branching fraction in a chi^2
determination over the minimal supergravity model (mSUGRA) parameter space. The
most favored region of mSUGRA parameter space for almost all tan(beta) values
is the hyperbolic branch/focus point (HB/FP) region, with moderate to small
values of superpotential Higgs mass |mu| and large GUT scale scalar mass m_0.
These favored regions of mSUGRA parameter space can be probed by direct search
experiments for supersymmetric dark matter. An exception to the HB/FP region
can occur at very large tan(beta) with positive mu values, where wide regions
allow resonance annihilation of neutralinos in the early universe.
| [
{
"created": "Thu, 13 Mar 2003 21:29:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2003 19:04:08 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Apr 2003 23:09:55 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Baer",
"Howard",
""
],
[
"Balazs",
"Csaba",
""
]
] | Recent results from the WMAP measurements of the cosmic background radiation yield very tight constraints on the relic density of supersymmetric cold dark matter. We combine the WMAP constraint with those from the anomalous magnetic moment of the muon and the b -> s gamma branching fraction in a chi^2 determination over the minimal supergravity model (mSUGRA) parameter space. The most favored region of mSUGRA parameter space for almost all tan(beta) values is the hyperbolic branch/focus point (HB/FP) region, with moderate to small values of superpotential Higgs mass |mu| and large GUT scale scalar mass m_0. These favored regions of mSUGRA parameter space can be probed by direct search experiments for supersymmetric dark matter. An exception to the HB/FP region can occur at very large tan(beta) with positive mu values, where wide regions allow resonance annihilation of neutralinos in the early universe. |
hep-ph/0406140 | Steffen Weinstock | T. Prokopec, M. G. Schmidt, S. Weinstock | Transport equations for chiral fermions to order \hbar and electroweak
baryogenesis: Part II | 52 pages, 12 figures; continuation of hep-ph/0312110; accepted for
publication in Annals of Physics | Ann.Phys.314:267-320,2004 | 10.1016/j.aop.2004.06.001 | BNL-72342-2004-JA, HD-THEP-04-22 | hep-ph | null | This is the second in a series of two papers. While in Paper I we derive
semiclassical Boltzmann transport equations and study their flow terms, here we
address the collision terms. We use a model Lagrangean, in which fermions
couple to scalars through Yukawa interactions and approximate the self-energies
by the one-loop expressions. This approximation already contains important
aspects of thermalization and scatterings required for quantitative studies of
transport in plasmas. We compute the CP-violating contributions to both the
scalar and the fermionic collision term.
| [
{
"created": "Fri, 11 Jun 2004 18:45:41 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Prokopec",
"T.",
""
],
[
"Schmidt",
"M. G.",
""
],
[
"Weinstock",
"S.",
""
]
] | This is the second in a series of two papers. While in Paper I we derive semiclassical Boltzmann transport equations and study their flow terms, here we address the collision terms. We use a model Lagrangean, in which fermions couple to scalars through Yukawa interactions and approximate the self-energies by the one-loop expressions. This approximation already contains important aspects of thermalization and scatterings required for quantitative studies of transport in plasmas. We compute the CP-violating contributions to both the scalar and the fermionic collision term. |
1307.4485 | Hanxin He | Han-Xin He and Yu-Xin Liu | A dynamical mechanism for generating quark confinement | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the dynamical mechanism for generating the infrared singular
quark-gluon vertex and quark confinement based on the gauge invariance in
covariant-gauge quantum chromodynamics(QCD). We first derive the
gauge-invariance constraint relation for the infrared-limit behavior of the
quark-gluon vertex, which shows the mechanism for generating the infrared
behavior of the quark-gluon vertex. We hence unravel a novel mechanism for
generating an infrared singular quark-gluon vertex and then a linear rising
potential for confining massive quarks, where the infrared singularity in the
form factors composing the quark-ghost scattering kernel plays a crucial role.
The mechanism for linking chiral symmetry breaking with quark confinement is
also shown.
| [
{
"created": "Wed, 17 Jul 2013 02:12:11 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2013 01:52:40 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Dec 2013 02:32:44 GMT",
"version": "v3"
}
] | 2013-12-16 | [
[
"He",
"Han-Xin",
""
],
[
"Liu",
"Yu-Xin",
""
]
] | We explore the dynamical mechanism for generating the infrared singular quark-gluon vertex and quark confinement based on the gauge invariance in covariant-gauge quantum chromodynamics(QCD). We first derive the gauge-invariance constraint relation for the infrared-limit behavior of the quark-gluon vertex, which shows the mechanism for generating the infrared behavior of the quark-gluon vertex. We hence unravel a novel mechanism for generating an infrared singular quark-gluon vertex and then a linear rising potential for confining massive quarks, where the infrared singularity in the form factors composing the quark-ghost scattering kernel plays a crucial role. The mechanism for linking chiral symmetry breaking with quark confinement is also shown. |
hep-ph/0306098 | Kevin L. Haglin | Charles Gale and Kevin L. Haglin | Electromagnetic radiation from relativistic nuclear collisions | Invited review for QGP3, R. Hwa and X.-N. Wang eds; references added
and typographical errors corrected in v2; Minor corrections v3 | null | null | null | hep-ph nucl-th | null | We review some of the results obtained in the study of the production of
electromagnetic radiation in relativistic nuclear collisions. We concentrate on
the emission of real photons and dileptons from the hot and dense strongly
interacting phases of the reaction. We examine the contributions from the
partonic sector, as well as those from the nonperturbative hadronic sector. We
examine the current data, some of the predictions for future measurements, and
comment on what has been learnt so far.
| [
{
"created": "Wed, 11 Jun 2003 19:53:51 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2003 19:30:32 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Jun 2003 18:08:08 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Gale",
"Charles",
""
],
[
"Haglin",
"Kevin L.",
""
]
] | We review some of the results obtained in the study of the production of electromagnetic radiation in relativistic nuclear collisions. We concentrate on the emission of real photons and dileptons from the hot and dense strongly interacting phases of the reaction. We examine the contributions from the partonic sector, as well as those from the nonperturbative hadronic sector. We examine the current data, some of the predictions for future measurements, and comment on what has been learnt so far. |
hep-ph/9712538 | Georg Raffelt | G.G.Raffelt (MPI Physics, Munich) | Dark Matter: Motivation, Candidates and Searches | 47 pages, 32 eps figures included, Lectures at European School of
High-Energy Physics, Menstrup, Denmark, June 1997 | null | null | null | hep-ph | null | The physical nature of most of the gravitating mass in the universe is
completely mysterious. The astrophysical evidence for the presence of this dark
matter and astrophysical constraints on its properties will be reviewed. The
most popular dark-matter candidates will be introduced, and current and future
attempts to search for them directly and indirectly will be discussed.
| [
{
"created": "Mon, 29 Dec 1997 18:00:16 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Raffelt",
"G. G.",
"",
"MPI Physics, Munich"
]
] | The physical nature of most of the gravitating mass in the universe is completely mysterious. The astrophysical evidence for the presence of this dark matter and astrophysical constraints on its properties will be reviewed. The most popular dark-matter candidates will be introduced, and current and future attempts to search for them directly and indirectly will be discussed. |
2003.13112 | Jens Braun | Jens Braun, Wei-jie Fu, Jan M. Pawlowski, Fabian Rennecke, Daniel
Rosenbl\"uh, Shi Yin | Chiral Susceptibility in (2+1)-flavour QCD | 9 pages, 3 figures, 1 table | Phys. Rev. D 102, 056010 (2020) | 10.1103/PhysRevD.102.056010 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate chiral susceptibilities in (2+1)-flavour QCD for different
masses of the light quarks using the functional renormalisation group (fRG)
approach to first-principles QCD. We follow the evolution of the chiral
susceptibilities with decreasing masses as obtained from both the light-quark
and the reduced quark condensate. The latter compares very well with recent
results from the HotQCD collaboration for pion masses $m_{\pi}\gtrsim
100\,\text{MeV}$. For smaller pion masses, the fRG and lattice results are
still consistent. In particular, the estimates for the chiral critical
temperature are in very good agreement. We close by discussing different
extrapolations to the chiral limit.
| [
{
"created": "Sun, 29 Mar 2020 19:06:52 GMT",
"version": "v1"
}
] | 2020-09-16 | [
[
"Braun",
"Jens",
""
],
[
"Fu",
"Wei-jie",
""
],
[
"Pawlowski",
"Jan M.",
""
],
[
"Rennecke",
"Fabian",
""
],
[
"Rosenblüh",
"Daniel",
""
],
[
"Yin",
"Shi",
""
]
] | We calculate chiral susceptibilities in (2+1)-flavour QCD for different masses of the light quarks using the functional renormalisation group (fRG) approach to first-principles QCD. We follow the evolution of the chiral susceptibilities with decreasing masses as obtained from both the light-quark and the reduced quark condensate. The latter compares very well with recent results from the HotQCD collaboration for pion masses $m_{\pi}\gtrsim 100\,\text{MeV}$. For smaller pion masses, the fRG and lattice results are still consistent. In particular, the estimates for the chiral critical temperature are in very good agreement. We close by discussing different extrapolations to the chiral limit. |
1912.10487 | Dr. Rukmani Mohanta | Rukmani Mohanta, Shivaramakrishna Singirala, Suchismita Sahoo | Exploring Dark Matter, Neutrino mass and flavour anomalies in
L_{\mu}-L_{\tau} model | 4 pages, 3 figures, to appear in the Proceedings of TAUP-2019
conference, Toyama, Japan | null | 10.1088/1742-6596/1468/1/012030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate Majorana dark matter in a new variant of
$U(1)_{L_{\mu}-L_{\tau}}$ gauge extension of Standard Model, containing three
additional neutral fermions $N_{e}, N_{\mu}, N_{\tau}$, along with a
$(\bar{3},1,1/3)$ scalar Leptoquark (SLQ) and an inert doublet, to study the
phenomenology of dark matter, neutrino mass generation and flavour anomalies on
a single platform. The lightest mass eigenstate of the $N_{\mu}, N_{\tau}$
neutral fermions plays the role of dark matter. We compute the WIMP-nucleon
cross section in leptoquark portal and the relic density mediated by inert
doublet components, leptoquark and the new $Z^{\prime}$ boson. We constrain the
parameter space consistent with Planck limit on relic density, PICO-60 and LUX
bounds on spin-dependent direct detection cross section. We also discuss about
the neutrino mass generation at one-loop level and the viable parameter region
to explain current neutrino oscillation data. The $Z^\prime$ gauge boson of
extended $U(1)$ symmetry and the SLQ play an important role in settling the
known issues of flavor sector.
| [
{
"created": "Sun, 22 Dec 2019 17:29:10 GMT",
"version": "v1"
}
] | 2020-05-20 | [
[
"Mohanta",
"Rukmani",
""
],
[
"Singirala",
"Shivaramakrishna",
""
],
[
"Sahoo",
"Suchismita",
""
]
] | We investigate Majorana dark matter in a new variant of $U(1)_{L_{\mu}-L_{\tau}}$ gauge extension of Standard Model, containing three additional neutral fermions $N_{e}, N_{\mu}, N_{\tau}$, along with a $(\bar{3},1,1/3)$ scalar Leptoquark (SLQ) and an inert doublet, to study the phenomenology of dark matter, neutrino mass generation and flavour anomalies on a single platform. The lightest mass eigenstate of the $N_{\mu}, N_{\tau}$ neutral fermions plays the role of dark matter. We compute the WIMP-nucleon cross section in leptoquark portal and the relic density mediated by inert doublet components, leptoquark and the new $Z^{\prime}$ boson. We constrain the parameter space consistent with Planck limit on relic density, PICO-60 and LUX bounds on spin-dependent direct detection cross section. We also discuss about the neutrino mass generation at one-loop level and the viable parameter region to explain current neutrino oscillation data. The $Z^\prime$ gauge boson of extended $U(1)$ symmetry and the SLQ play an important role in settling the known issues of flavor sector. |
hep-ph/0407161 | Jan Smit | Jan Smit | Effective CP violation in the Standard Model | 19 pages, no figures | JHEP0409:067,2004 | 10.1088/1126-6708/2004/09/067 | ITFA-2004-27 | hep-ph astro-ph hep-th | null | We study the strength of effective CP violation originating from the CKM
matrix in the effective action obtained by integrating out the fermions in the
Standard Model. Using results obtained by Salcedo for the effective action in a
general chiral gauge model, we find that there are no CKM CP-violating terms to
fourth order in a gauge-covariant derivative expansion that is non-perturbative
in the Higgs field. The details of the calculation suggest that, at zero
temperature, the strength of CP violation is approximately independent of the
overall scale of the Yukawa couplings. Thus, order of magnitude estimates based
on Jarlskog's invariant could be too small by a factor of about 10^{17}.
| [
{
"created": "Wed, 14 Jul 2004 14:28:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Smit",
"Jan",
""
]
] | We study the strength of effective CP violation originating from the CKM matrix in the effective action obtained by integrating out the fermions in the Standard Model. Using results obtained by Salcedo for the effective action in a general chiral gauge model, we find that there are no CKM CP-violating terms to fourth order in a gauge-covariant derivative expansion that is non-perturbative in the Higgs field. The details of the calculation suggest that, at zero temperature, the strength of CP violation is approximately independent of the overall scale of the Yukawa couplings. Thus, order of magnitude estimates based on Jarlskog's invariant could be too small by a factor of about 10^{17}. |
hep-ph/0611055 | Fuminobu Takahashi | Motoi Endo, Fuminobu Takahashi, T. T. Yanagida | Spontaneous Non-thermal Leptogenesis in High-scale Inflation Models | 18 pages, 1 figure. v2: references added, accepted for publication in
PRD | Phys.Rev.D74:123523,2006 | 10.1103/PhysRevD.74.123523 | DESY 06-149 | hep-ph astro-ph hep-th | null | We argue that a non-thermal leptogenesis occurs spontaneously, without direct
couplings of the inflaton with right-handed neutrinos, in a wide class of
high-scale inflation models such as the chaotic and hybrid inflation. It is
only a finite vacuum expectation value of the inflaton, or more precisely, a
linear term in the Kahler potential, that is a prerequisite for the spontaneous
non-thermal leptogenesis. To exemplify how it works, we show that a chaotic
inflation model in supergravity naturally produces a right amount of baryon
asymmetry via the spontaneous non-thermal leptogenesis. We also discuss the
gravitino production from the inflaton.
| [
{
"created": "Mon, 6 Nov 2006 08:06:12 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2006 10:49:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Endo",
"Motoi",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yanagida",
"T. T.",
""
]
] | We argue that a non-thermal leptogenesis occurs spontaneously, without direct couplings of the inflaton with right-handed neutrinos, in a wide class of high-scale inflation models such as the chaotic and hybrid inflation. It is only a finite vacuum expectation value of the inflaton, or more precisely, a linear term in the Kahler potential, that is a prerequisite for the spontaneous non-thermal leptogenesis. To exemplify how it works, we show that a chaotic inflation model in supergravity naturally produces a right amount of baryon asymmetry via the spontaneous non-thermal leptogenesis. We also discuss the gravitino production from the inflaton. |
hep-ph/0004047 | A. F. W. van Hameren | P. Draggiotis, A. van Hameren and R. Kleiss | SARGE: an algorithm for generating QCD-antennas | 9 pages, affiliation corrected | Phys.Lett. B483 (2000) 124-130 | 10.1016/S0370-2693(00)00532-3 | null | hep-ph physics.comp-ph | null | We present an algorithm to generate any number of random massless momenta in
phase space, with a distribution that contains the kinematical pole structure
that is typically found in multi-parton QCD-processes. As an application, we
calculate the cross-section of some \eplus\eminus \to partons processes, and
compare SARGE's performance with that of the uniform-phase space generator
RAMBO.
| [
{
"created": "Thu, 6 Apr 2000 09:08:21 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2000 09:39:18 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Draggiotis",
"P.",
""
],
[
"van Hameren",
"A.",
""
],
[
"Kleiss",
"R.",
""
]
] | We present an algorithm to generate any number of random massless momenta in phase space, with a distribution that contains the kinematical pole structure that is typically found in multi-parton QCD-processes. As an application, we calculate the cross-section of some \eplus\eminus \to partons processes, and compare SARGE's performance with that of the uniform-phase space generator RAMBO. |
2301.02857 | Defu Hou | Shu-Yun Yang, Ren-Da Dong, Defu Hou, and Hai-Cang Ren | De Haas - van Alphen Effect under Rotation | 21 pages, 9 figures in Revtex | null | 10.1103/PhysRevD.107.076020 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We explored the interplay between magnetic field and rotation in the de Hass
- van Alphen oscillation. The effect is found to be reduced because of the
re-weighting of different states within the same Landau level by rotation
energy. The implications of our results on high energy physics and condensed
matter physics are speculated.
| [
{
"created": "Sat, 7 Jan 2023 13:59:51 GMT",
"version": "v1"
}
] | 2023-05-03 | [
[
"Yang",
"Shu-Yun",
""
],
[
"Dong",
"Ren-Da",
""
],
[
"Hou",
"Defu",
""
],
[
"Ren",
"Hai-Cang",
""
]
] | We explored the interplay between magnetic field and rotation in the de Hass - van Alphen oscillation. The effect is found to be reduced because of the re-weighting of different states within the same Landau level by rotation energy. The implications of our results on high energy physics and condensed matter physics are speculated. |
2003.13265 | Dimitrios Karamitros | Luc Darm\'e, Andrzej Hryczuk, Dimitrios Karamitros, Leszek Roszkowski | Forbidden Freeze-In | 7 pages, 4 figures. To appear in the Proceedings of Corfu Summer
Institute 2019 "School and Workshops on Elementary Particle Physics and
Gravity" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the importance of a frozen-in dark matter production regime, where
the dark matter particle is produced via kinematically forbidden decays that
arise from significant thermal correction to the mass a mediator particle in
the plasma.
| [
{
"created": "Mon, 30 Mar 2020 08:25:40 GMT",
"version": "v1"
}
] | 2020-03-31 | [
[
"Darmé",
"Luc",
""
],
[
"Hryczuk",
"Andrzej",
""
],
[
"Karamitros",
"Dimitrios",
""
],
[
"Roszkowski",
"Leszek",
""
]
] | We study the importance of a frozen-in dark matter production regime, where the dark matter particle is produced via kinematically forbidden decays that arise from significant thermal correction to the mass a mediator particle in the plasma. |
0908.0470 | Alexander Merle | Adisorn Adulpravitchai, Manfred Lindner, Alexander Merle, Rabindra
N.Mohapatra | Radiative Transmission of Lepton Flavor Hierarchies | 11 pages, 1 figure | Phys.Lett.B680:476-479,2009 | 10.1016/j.physletb.2009.09.042 | UMD-PP-09-047 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a one loop model for neutrino masses which leads to a seesaw-like
formula with the difference that the charged lepton masses replace the unknown
Dirac mass matrix present in the usual seesaw case. This is a considerable
reduction of parameters in the neutrino sector and predicts a strong
hierarchical pattern in the right handed neutrino mass matrix that is easily
derived from a $U(1)_H$ family symmetry. The model is based on the left-right
gauge group with an additional $Z_4$ discrete symmetry which gives vanishing
neutrino Dirac masses and finite Majorana masses arising at the one loop level.
Furthermore, it is one of the few models that naturally allow for large (but
not necessarily maximal) mixing angles in the lepton sector. A generalization
of the model to the quark sector requires three iso-spin singlet vector-like
down type quarks, as in $E_6$. The model predicts an inert doublet type scalar
dark matter.
| [
{
"created": "Tue, 4 Aug 2009 15:29:34 GMT",
"version": "v1"
}
] | 2009-12-10 | [
[
"Adulpravitchai",
"Adisorn",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Merle",
"Alexander",
""
],
[
"Mohapatra",
"Rabindra N.",
""
]
] | We discuss a one loop model for neutrino masses which leads to a seesaw-like formula with the difference that the charged lepton masses replace the unknown Dirac mass matrix present in the usual seesaw case. This is a considerable reduction of parameters in the neutrino sector and predicts a strong hierarchical pattern in the right handed neutrino mass matrix that is easily derived from a $U(1)_H$ family symmetry. The model is based on the left-right gauge group with an additional $Z_4$ discrete symmetry which gives vanishing neutrino Dirac masses and finite Majorana masses arising at the one loop level. Furthermore, it is one of the few models that naturally allow for large (but not necessarily maximal) mixing angles in the lepton sector. A generalization of the model to the quark sector requires three iso-spin singlet vector-like down type quarks, as in $E_6$. The model predicts an inert doublet type scalar dark matter. |
1803.10546 | Thorsten Steinert | Thorsten Steinert, Wolfgang Cassing | Covariant interacting Hadron-Resonance Gas model | 15 pages, 13 figures, version as published in PRC | Phys. Rev. C 98, 014908 (2018) | 10.1103/PhysRevC.98.014908 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hadron-Resonance Gas (HRG) approach - used to model hadronic matter at
small baryon potentials $\mu_B$ and finite temperature $T$ - is extended to
finite and large chemical potentials by introducing interactions between
baryons in line with relativistic mean-field theory defining an interacting HRG
(IHRG). Using lattice data for $\mu_B=0$ as well as information on the nuclear
equation of state at $T=0$ we constrain the attractive and repulsive
interactions of the IHRG such that it reproduces the lattice equation of state
at $\mu_B=0$ and the nuclear equation of state at $T=0$ and finite $\mu_B$. The
formulated covariant approach is thermodynamically consistent and allows us to
provide further information on the phase boundary between hadronic and partonic
phases of strongly interacting matter by assuming constant thermodynamic
potentials.
| [
{
"created": "Wed, 28 Mar 2018 11:49:13 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2018 09:11:23 GMT",
"version": "v2"
}
] | 2018-07-25 | [
[
"Steinert",
"Thorsten",
""
],
[
"Cassing",
"Wolfgang",
""
]
] | The Hadron-Resonance Gas (HRG) approach - used to model hadronic matter at small baryon potentials $\mu_B$ and finite temperature $T$ - is extended to finite and large chemical potentials by introducing interactions between baryons in line with relativistic mean-field theory defining an interacting HRG (IHRG). Using lattice data for $\mu_B=0$ as well as information on the nuclear equation of state at $T=0$ we constrain the attractive and repulsive interactions of the IHRG such that it reproduces the lattice equation of state at $\mu_B=0$ and the nuclear equation of state at $T=0$ and finite $\mu_B$. The formulated covariant approach is thermodynamically consistent and allows us to provide further information on the phase boundary between hadronic and partonic phases of strongly interacting matter by assuming constant thermodynamic potentials. |
1801.01414 | Xing-Gang Wu | Jun Zeng, Xing-Gang Wu, Shi Bu, Jian-Ming Shen, Sheng-Quan Wang | Reanalysis of the Higgs-boson decay $H \to gg$ up to $\alpha_s^6$-order
level using the principle of maximum conformality | 9 pages, 6 figures. Revised version to be published in J.Phys.G | J. Phys. G: Nucl. Part. Phys. 45, 085004 (2018) | 10.1088/1361-6471/aace6f | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the newly available $\alpha_s^6$-order QCD correction to the Higgs
decay channel $H\to gg$, we make a detailed discussion on the perturbative
properties of the decay width $\Gamma(H\to gg)$ by using the principle of
maximum conformality (PMC). The PMC provides a way to eliminate the
conventional renormalization scheme-and-scale ambiguities, which uses the
renormalization group equation to determine the optimal running behavior of the
strong coupling constant at each order via a recursive way. Even though there
is no ambiguity for setting the renormalization scale, there is residual scale
dependence for the PMC predictions due to unknown high-order terms. Using the
$\alpha_s^6$-order terms, the somewhat larger residual renormalization scale
dependence at the $\alpha_s^5$-order level observed in our previous work can be
greatly suppressed, which shows $\Gamma (H\to gg)\rm{|_{ PMC }} =337.9
\pm1.7_{-0.1}^{+0.9}\pm1.9$ KeV, where the first error is caused by the Higgs
mass uncertainty $\Delta M_{H}=0.24$ GeV, the second one is the residual scale
dependence by varying the initial choice of scale within the region of
$\left[{M_H}/{2},4 M_H\right]$, and the third one is the conservative
prediction of unknown high-order contributions.
| [
{
"created": "Thu, 4 Jan 2018 15:46:47 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2018 14:31:26 GMT",
"version": "v2"
}
] | 2018-07-10 | [
[
"Zeng",
"Jun",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Bu",
"Shi",
""
],
[
"Shen",
"Jian-Ming",
""
],
[
"Wang",
"Sheng-Quan",
""
]
] | Using the newly available $\alpha_s^6$-order QCD correction to the Higgs decay channel $H\to gg$, we make a detailed discussion on the perturbative properties of the decay width $\Gamma(H\to gg)$ by using the principle of maximum conformality (PMC). The PMC provides a way to eliminate the conventional renormalization scheme-and-scale ambiguities, which uses the renormalization group equation to determine the optimal running behavior of the strong coupling constant at each order via a recursive way. Even though there is no ambiguity for setting the renormalization scale, there is residual scale dependence for the PMC predictions due to unknown high-order terms. Using the $\alpha_s^6$-order terms, the somewhat larger residual renormalization scale dependence at the $\alpha_s^5$-order level observed in our previous work can be greatly suppressed, which shows $\Gamma (H\to gg)\rm{|_{ PMC }} =337.9 \pm1.7_{-0.1}^{+0.9}\pm1.9$ KeV, where the first error is caused by the Higgs mass uncertainty $\Delta M_{H}=0.24$ GeV, the second one is the residual scale dependence by varying the initial choice of scale within the region of $\left[{M_H}/{2},4 M_H\right]$, and the third one is the conservative prediction of unknown high-order contributions. |
hep-ph/0112154 | U. Meissner | Bastian Kubis and Ulf-G. Mei{\ss}ner | Isospin violation in low-energy charged pion-kaon scattering | 9 pp, 2 figs | Phys.Lett. B529 (2002) 69-76 | 10.1016/S0370-2693(02)01192-9 | FZJ-IKP(TH)-2001-24 | hep-ph | null | We evaluate the isospin breaking corrections to the scattering amplitude
\pi^- K^+ -> \pi^- K^+ at threshold in the framework of chiral perturbation
theory. This channel is of particular interest for the strong 2S-2P energy
level shift in pion-kaon bound states. While a prediction of this level shift
is hampered by a large uncertainty in the isoscalar scattering length, we find
only a moderate uncertainty of about 3% in the electromagnetic corrections
which are relevant for the extraction of the scattering lengths from experiment
| [
{
"created": "Tue, 11 Dec 2001 13:40:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kubis",
"Bastian",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We evaluate the isospin breaking corrections to the scattering amplitude \pi^- K^+ -> \pi^- K^+ at threshold in the framework of chiral perturbation theory. This channel is of particular interest for the strong 2S-2P energy level shift in pion-kaon bound states. While a prediction of this level shift is hampered by a large uncertainty in the isoscalar scattering length, we find only a moderate uncertainty of about 3% in the electromagnetic corrections which are relevant for the extraction of the scattering lengths from experiment |
0803.0061 | Vladimir Kuksa | V.Beylin, V.Kuksa, G.Vereshkov | Radiative decays of vector mesons in the gauge model of quark-meson
interactions | 16 pages, 4 figures, change content, added references | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider meson radiative decays within the framework of $U_0(1)\times
U(1)\times SU(2)$ gauge symmetry. This approach is based on the linear
sigma-model extended by the gauge and quark-meson interactions. Physical
content and parameters of the model are discussed. Theoretical predictions for
some radiative decays of vector mesons are in a good agreement with the
experimental data.
| [
{
"created": "Sat, 1 Mar 2008 11:37:17 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 2009 13:09:44 GMT",
"version": "v2"
}
] | 2009-05-28 | [
[
"Beylin",
"V.",
""
],
[
"Kuksa",
"V.",
""
],
[
"Vereshkov",
"G.",
""
]
] | We consider meson radiative decays within the framework of $U_0(1)\times U(1)\times SU(2)$ gauge symmetry. This approach is based on the linear sigma-model extended by the gauge and quark-meson interactions. Physical content and parameters of the model are discussed. Theoretical predictions for some radiative decays of vector mesons are in a good agreement with the experimental data. |
hep-ph/9712409 | Uma Shankar | Mohan Narayan, G. Rajasekaran (IMSc, Madras) and S. Uma Sankar (IIT,
Bombay) | Three flavor implications of CHOOZ result | 6 pages of text and 4 figures | Phys.Rev.D58:031301,1998 | 10.1103/PhysRevD.58.031301 | IMSc/97/12/41 | hep-ph | null | We analyze the recent result of the CHOOZ collaboration in the context of
mixing and oscillations between all the three neutrino flavors. If one assumes
a hierarchy among the vacuum mass eigenvalues (\delta_{21} \ll \delta_{31}),
then the CHOOZ result limits the (13) mixing angle \phi to quite small values.
This in turn limits the contribution of the \nu_e <--> \nu_\mu oscillation
channel to the atmospheric neutrino anomaly to less than 10 percent. It also
implies that the solution to the solar neutrino problem is effectively \nu_e
<--> \nu_\mu oscillation and that of the atmospheric neutrino problem is
effectively \nu_\mu <--> \nu_\tau.
| [
{
"created": "Wed, 17 Dec 1997 08:46:59 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Narayan",
"Mohan",
"",
"IMSc, Madras"
],
[
"Rajasekaran",
"G.",
"",
"IMSc, Madras"
],
[
"Sankar",
"S. Uma",
"",
"IIT,\n Bombay"
]
] | We analyze the recent result of the CHOOZ collaboration in the context of mixing and oscillations between all the three neutrino flavors. If one assumes a hierarchy among the vacuum mass eigenvalues (\delta_{21} \ll \delta_{31}), then the CHOOZ result limits the (13) mixing angle \phi to quite small values. This in turn limits the contribution of the \nu_e <--> \nu_\mu oscillation channel to the atmospheric neutrino anomaly to less than 10 percent. It also implies that the solution to the solar neutrino problem is effectively \nu_e <--> \nu_\mu oscillation and that of the atmospheric neutrino problem is effectively \nu_\mu <--> \nu_\tau. |
2206.08563 | Chaja Baruch | Chaja Baruch, Philip Ilten, Yotam Soreq, Mike Williams | Axial vectors in DarkCast | 26 pages, 10 figures, 3 tables | null | 10.1007/JHEP11(2022)124 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In this work, we explore new spin-1 states with axial couplings to the
standard model fermions. We develop a data-driven method to estimate their
hadronic decay rates based on data from $\tau$ decays and using SU(3)$_{\rm
flavor}$ symmetry. We derive the current and future experimental constraints
for several benchmark models. Our framework is generic and can be used for
models with arbitrary vectorial and axial couplings to quarks. We have made our
calculations publicly available by incorporating them into the DarkCast
package, see https://gitlab.com/darkcast/releases.
| [
{
"created": "Fri, 17 Jun 2022 05:50:23 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Baruch",
"Chaja",
""
],
[
"Ilten",
"Philip",
""
],
[
"Soreq",
"Yotam",
""
],
[
"Williams",
"Mike",
""
]
] | In this work, we explore new spin-1 states with axial couplings to the standard model fermions. We develop a data-driven method to estimate their hadronic decay rates based on data from $\tau$ decays and using SU(3)$_{\rm flavor}$ symmetry. We derive the current and future experimental constraints for several benchmark models. Our framework is generic and can be used for models with arbitrary vectorial and axial couplings to quarks. We have made our calculations publicly available by incorporating them into the DarkCast package, see https://gitlab.com/darkcast/releases. |
1905.13224 | Chakrit Pongkitivanichkul | Chakrit Pongkitivanichkul, Nakorn Thongyoi, and Patipan Uttayarat | Inverse Seesaw and Portal Dark Matter | 9 pages, 5 figures | Phys. Rev. D 100, 035034 (2019) | 10.1103/PhysRevD.100.035034 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenology of the inverse seesaw mechanism in the
scalar-Higgs portal dark matter model. The model is an extension of the
Standard Model including two additional neutrinos, a singlet scalar and a
fermionic dark matter. We consider the inverse seesaw mechanism where the mass
of 2 additional neutrinos are made dynamic by the singlet scalar. We found that
the natural scale for the scalar vacuum expectation value is naturally close to
the weak scale. Motivating by this fact, we focus on the possibility of the
singlet scalar connecting with dark matter, i.e., the scalar is also the
mediator between dark sector and the Standard Model. We perform a numerical
analysis over the parameter space subject to the indirect and direct detection
constraints. The feasible region of the parameter space will be discussed.
| [
{
"created": "Wed, 29 May 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2020 15:37:57 GMT",
"version": "v2"
}
] | 2020-10-13 | [
[
"Pongkitivanichkul",
"Chakrit",
""
],
[
"Thongyoi",
"Nakorn",
""
],
[
"Uttayarat",
"Patipan",
""
]
] | We study the phenomenology of the inverse seesaw mechanism in the scalar-Higgs portal dark matter model. The model is an extension of the Standard Model including two additional neutrinos, a singlet scalar and a fermionic dark matter. We consider the inverse seesaw mechanism where the mass of 2 additional neutrinos are made dynamic by the singlet scalar. We found that the natural scale for the scalar vacuum expectation value is naturally close to the weak scale. Motivating by this fact, we focus on the possibility of the singlet scalar connecting with dark matter, i.e., the scalar is also the mediator between dark sector and the Standard Model. We perform a numerical analysis over the parameter space subject to the indirect and direct detection constraints. The feasible region of the parameter space will be discussed. |
1104.3458 | Gustavo Gil da Silveira G.G. Silveira | M.B. Gay Ducati and G.G. Silveira | Estimations for the Higgs boson production with QCD and EW corrections
in exclusive events at the LHC | 19 pages, 5 figures | Phys.Rev.D84:034042,2011 | 10.1103/PhysRevD.84.034042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs boson production is investigated in proton-proton collisions at
next-to-leading-order accuracy in central exclusive diffractive processes at
the LHC. The production process by the double Pomeron exchange is analyzed in
the diffractive factorization through the Ingelman-Schlein approach, taking
into account the parton content of the Pomeron by the diffractive partonic
distribution function provided by the H1 Collaboration. Hence, we estimate the
production cross section of the Higgs boson as well as its rapidity
distribution for distinct energies of the LHC. Also, we include the gap
survival probability in our calculation, which is studied in recent works and
expected to lie in the range between 1% and 5% for the energy regime of 14 TeV.
As a result, we found a production cross section of about 0.3--0.8 (1.2--3.7)
fb at 7 (14) TeV, being of the same order as predicted by the two-photon and
the Balitsky-Fadin-Kuraev-Lipatov Pomeron mechanisms. Therefore, assuming the
selection rules of spin-parity properties, the exclusive production is a
promising channel for the Higgs boson detection in the LHC.
| [
{
"created": "Mon, 18 Apr 2011 12:38:08 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Sep 2011 13:59:07 GMT",
"version": "v2"
}
] | 2011-09-19 | [
[
"Ducati",
"M. B. Gay",
""
],
[
"Silveira",
"G. G.",
""
]
] | The Higgs boson production is investigated in proton-proton collisions at next-to-leading-order accuracy in central exclusive diffractive processes at the LHC. The production process by the double Pomeron exchange is analyzed in the diffractive factorization through the Ingelman-Schlein approach, taking into account the parton content of the Pomeron by the diffractive partonic distribution function provided by the H1 Collaboration. Hence, we estimate the production cross section of the Higgs boson as well as its rapidity distribution for distinct energies of the LHC. Also, we include the gap survival probability in our calculation, which is studied in recent works and expected to lie in the range between 1% and 5% for the energy regime of 14 TeV. As a result, we found a production cross section of about 0.3--0.8 (1.2--3.7) fb at 7 (14) TeV, being of the same order as predicted by the two-photon and the Balitsky-Fadin-Kuraev-Lipatov Pomeron mechanisms. Therefore, assuming the selection rules of spin-parity properties, the exclusive production is a promising channel for the Higgs boson detection in the LHC. |
1803.01880 | Jared Evans | Jared A. Evans and David McKeen | The Light Gluino Gap | 13 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A variety of experimental searches and theoretical efforts have constrained
gluinos that undergo an all-hadronic decay with no missing energy, as can arise
in R-parity violating or stealth supersymmetry. Although the gluino->jj decay
is robustly excluded, there is gap in current experimental coverage for gluinos
with masses between 51-76 GeV that decay into three light-flavor quarks. In
this work, we probe this gap with published multi-jet data from the UA2
experiment. Despite setting the strongest current limit on this region, we find
that UA2 data is unable to close this gap for gluino->jjj decays. In addition
to this three-jet gap, we note an additional gap for all-hadronic gluino -> n
parton decays with $n\geq 4$ for light gluinos (51 GeV < m < 300 GeV) not
covered by the current search program.
| [
{
"created": "Mon, 5 Mar 2018 19:05:06 GMT",
"version": "v1"
}
] | 2018-03-07 | [
[
"Evans",
"Jared A.",
""
],
[
"McKeen",
"David",
""
]
] | A variety of experimental searches and theoretical efforts have constrained gluinos that undergo an all-hadronic decay with no missing energy, as can arise in R-parity violating or stealth supersymmetry. Although the gluino->jj decay is robustly excluded, there is gap in current experimental coverage for gluinos with masses between 51-76 GeV that decay into three light-flavor quarks. In this work, we probe this gap with published multi-jet data from the UA2 experiment. Despite setting the strongest current limit on this region, we find that UA2 data is unable to close this gap for gluino->jjj decays. In addition to this three-jet gap, we note an additional gap for all-hadronic gluino -> n parton decays with $n\geq 4$ for light gluinos (51 GeV < m < 300 GeV) not covered by the current search program. |
hep-ph/0103171 | Pedro Vieira Alberto | P. Alberto, M. Fiolhais, B. Golli and J. Marques | N^* electroproduction amplitudes in a model with dynamical confinement | 12 pages, 6 figures, uses elsevier macros | Phys.Lett. B523 (2001) 273-279 | 10.1016/S0370-2693(01)01348-X | null | hep-ph | null | The Roper resonance is described in a chiral version of the chromodielectric
model as a cluster of three quarks in radial-orbital configuration
(1s)$^2$(2s)$^1$, surrounded by $\pi$ and $\sigma$-meson clouds and by a
chromodielectric field which assures quark dynamical confinement. Radial
profiles for all fields are determined self-consistently for each baryon.
Transverse $A_{1/2}$ and scalar $S_{1/2}$ helicity amplitudes for the
nucleon-Roper transition are calculated. The contribution of glueball and
$\sigma$-meson vibrations is estimated; although small for N(1440), the
$\sigma$ contribution can be large for N(1710).
| [
{
"created": "Thu, 15 Mar 2001 11:36:31 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2001 11:25:19 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Alberto",
"P.",
""
],
[
"Fiolhais",
"M.",
""
],
[
"Golli",
"B.",
""
],
[
"Marques",
"J.",
""
]
] | The Roper resonance is described in a chiral version of the chromodielectric model as a cluster of three quarks in radial-orbital configuration (1s)$^2$(2s)$^1$, surrounded by $\pi$ and $\sigma$-meson clouds and by a chromodielectric field which assures quark dynamical confinement. Radial profiles for all fields are determined self-consistently for each baryon. Transverse $A_{1/2}$ and scalar $S_{1/2}$ helicity amplitudes for the nucleon-Roper transition are calculated. The contribution of glueball and $\sigma$-meson vibrations is estimated; although small for N(1440), the $\sigma$ contribution can be large for N(1710). |
1605.04804 | Hyun Min Lee | Soo-Min Choi, Yoo-Jin Kang, Hyun Min Lee | Diphoton resonance confronts dark matter | 30 pages, 10 figures, To appear in Journal of High Energy Physics | null | 10.1007/JHEP07(2016)030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an interpretation of the 750 GeV diphoton excesses recently reported by
both ATLAS and CMS collaborations, we consider a simple extension of the
Standard Model with a Dirac fermion dark matter where a singlet complex scalar
field mediates between dark matter and SM particles via effective couplings to
SM gauge bosons and/or Higgs-portal. In this model, we can accommodate the
diphoton events through the direct and/or cascade decays of pseudo-scalar and
real scalar partners of the complex scalar field. We show that mono-jet
searches and gamma-ray observations are complementary in constraining the
region where the width of the diphoton resonance can be enhanced due to the
couplings of the resonance to dark matter and the correct relic density is
obtained. In the case of cascade decay of the resonance, the effective
couplings of singlet scalars can be smaller, but the model is still testable by
the future discrimination between single photon and photon-jet at the LHC as
well as the gamma-ray searches for the cascade annihilation of dark matter.
| [
{
"created": "Mon, 16 May 2016 15:20:47 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2016 07:12:12 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jun 2016 13:04:44 GMT",
"version": "v3"
}
] | 2016-08-03 | [
[
"Choi",
"Soo-Min",
""
],
[
"Kang",
"Yoo-Jin",
""
],
[
"Lee",
"Hyun Min",
""
]
] | As an interpretation of the 750 GeV diphoton excesses recently reported by both ATLAS and CMS collaborations, we consider a simple extension of the Standard Model with a Dirac fermion dark matter where a singlet complex scalar field mediates between dark matter and SM particles via effective couplings to SM gauge bosons and/or Higgs-portal. In this model, we can accommodate the diphoton events through the direct and/or cascade decays of pseudo-scalar and real scalar partners of the complex scalar field. We show that mono-jet searches and gamma-ray observations are complementary in constraining the region where the width of the diphoton resonance can be enhanced due to the couplings of the resonance to dark matter and the correct relic density is obtained. In the case of cascade decay of the resonance, the effective couplings of singlet scalars can be smaller, but the model is still testable by the future discrimination between single photon and photon-jet at the LHC as well as the gamma-ray searches for the cascade annihilation of dark matter. |
hep-ph/9712542 | D. R. T. Jones | I. Jack, D.R.T. Jones and A. Pickering | Renormalisation Invariance and the Soft $\beta$-Functions | 9 pages, tex, Uses harvmac (big) | Phys.Lett. B426 (1998) 73-77 | 10.1016/S0370-2693(98)00270-6 | LTH 419 | hep-ph | null | We demonstrate that the soft supersymmetry-breaking terms in a N=1 theory can
be linked by simple renormalisation group invariant relations which are valid
to all orders of perturbation theory. In the special case of finite N=1
theories, the soft terms preserve finiteness to all orders.
| [
{
"created": "Tue, 30 Dec 1997 11:12:03 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
],
[
"Pickering",
"A.",
""
]
] | We demonstrate that the soft supersymmetry-breaking terms in a N=1 theory can be linked by simple renormalisation group invariant relations which are valid to all orders of perturbation theory. In the special case of finite N=1 theories, the soft terms preserve finiteness to all orders. |
2309.15351 | Gang l\"u | Gang L\"u, Chang Chang Zhang, Yan-Lin Zhao, Li-Ying Zhang | Resonant contribution of the three-body decay process $\bar
B_{s}\rightarrow K^{+}K^{-} P$ in perturbation QCD | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the CP violation in the decay process $\bar B_{s} \rightarrow
\phi(\rho,\omega) P \rightarrow K^{+}K^{-}P$ by considering the interference
effects of $\phi\rightarrow K^{+}K^{-}$, $\rho\rightarrow K^{+}K^{-}$ and
$\omega\rightarrow K^{+}K^{-}$ within the framework of perturbative QCD method
(P refers to $\pi$, K, $\eta$ and $\eta'$ pseudoscalar mesons, respectively).
We analyse the mixings of $\phi-\rho^{0}$, $\phi-\omega$ and $\omega-\rho^{0}$
and provide the amplitudes of the quasi-two-body decay processes. The CP
violation for $\bar B_{s} \rightarrow K^{+}K^{-} P$ decay process is obvious at
the ranges of the three vector mesons interferences. Meanwhile, the localised
CP violation can be found for comparing with the experiment results from
three-body decay process at the LHC in the near future.
| [
{
"created": "Wed, 27 Sep 2023 01:47:44 GMT",
"version": "v1"
}
] | 2023-09-28 | [
[
"Lü",
"Gang",
""
],
[
"Zhang",
"Chang Chang",
""
],
[
"Zhao",
"Yan-Lin",
""
],
[
"Zhang",
"Li-Ying",
""
]
] | We investigate the CP violation in the decay process $\bar B_{s} \rightarrow \phi(\rho,\omega) P \rightarrow K^{+}K^{-}P$ by considering the interference effects of $\phi\rightarrow K^{+}K^{-}$, $\rho\rightarrow K^{+}K^{-}$ and $\omega\rightarrow K^{+}K^{-}$ within the framework of perturbative QCD method (P refers to $\pi$, K, $\eta$ and $\eta'$ pseudoscalar mesons, respectively). We analyse the mixings of $\phi-\rho^{0}$, $\phi-\omega$ and $\omega-\rho^{0}$ and provide the amplitudes of the quasi-two-body decay processes. The CP violation for $\bar B_{s} \rightarrow K^{+}K^{-} P$ decay process is obvious at the ranges of the three vector mesons interferences. Meanwhile, the localised CP violation can be found for comparing with the experiment results from three-body decay process at the LHC in the near future. |
hep-ph/0310076 | Gustavo Burdman | Gustavo Burdman and Ian Shipsey | $D^0-\bar{D^0}$ Mixing and Rare Charm Decays | 62 pages, 14 figures. To appear in Annual Review of Nuclear and
Particle Science, Volume 53, December 2003 | Ann.Rev.Nucl.Part.Sci.53:431-499,2003 | 10.1146/annurev.nucl.53.041002.110348 | null | hep-ph hep-ex | null | We review the current status of flavor-changing neutral currents in the charm
sector. We focus on the standard-model predictions and identify the main
sources of theoretical uncertainties in both charm mixing and rare charm
decays. The potential of these observables for constraining short-distance
physics in the standard model and its extensions is compromised by the presence
of large nonperturbative effects. We examine the possible discovery windows in
which short-distance physics can be tested and study the effects of various
extensions of the standard model. The current experimental situation and future
prospects are reviewed.
| [
{
"created": "Mon, 6 Oct 2003 23:16:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2003 05:52:48 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Burdman",
"Gustavo",
""
],
[
"Shipsey",
"Ian",
""
]
] | We review the current status of flavor-changing neutral currents in the charm sector. We focus on the standard-model predictions and identify the main sources of theoretical uncertainties in both charm mixing and rare charm decays. The potential of these observables for constraining short-distance physics in the standard model and its extensions is compromised by the presence of large nonperturbative effects. We examine the possible discovery windows in which short-distance physics can be tested and study the effects of various extensions of the standard model. The current experimental situation and future prospects are reviewed. |
1504.02752 | Anders Kvellestad | Ben Allanach, Are Raklev and Anders Kvellestad | Consistency of the recent ATLAS $Z+E_T^{\rm miss}$ excess in a
simplified GGM model | Extended discussion of results, added two figures, minor corrections.
7 pages, 6 figures | Phys. Rev. D 91, 095016 (2015) | 10.1103/PhysRevD.91.095016 | DAMTP-2015-04-13 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | ATLAS recently reported a $3\sigma$ excess in a leptonic-$Z+E_T^{\rm miss}$
channel. This was interpreted in the literature in a simplified General Gauge
Mediation model containing a gluino, a higgsino next-to-lightest supersymmetric
particle (NLSP) and a gravitino lightest supersymmetric particle (LSP). We test
the consistency of this explanation in lieu of the results of the corresponding
search in CMS, and other LHC searches for New Physics. Due to non-decoupling
effects from squarks the parameter space of these models is split into two
regions; in one region additional leptons via top quark production is expected,
while the other region sees a large probability for zero-lepton events. After
combining the relevant constraints we find that these models cannot explain the
ATLAS excess.
| [
{
"created": "Fri, 10 Apr 2015 18:16:29 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 2015 19:51:55 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Allanach",
"Ben",
""
],
[
"Raklev",
"Are",
""
],
[
"Kvellestad",
"Anders",
""
]
] | ATLAS recently reported a $3\sigma$ excess in a leptonic-$Z+E_T^{\rm miss}$ channel. This was interpreted in the literature in a simplified General Gauge Mediation model containing a gluino, a higgsino next-to-lightest supersymmetric particle (NLSP) and a gravitino lightest supersymmetric particle (LSP). We test the consistency of this explanation in lieu of the results of the corresponding search in CMS, and other LHC searches for New Physics. Due to non-decoupling effects from squarks the parameter space of these models is split into two regions; in one region additional leptons via top quark production is expected, while the other region sees a large probability for zero-lepton events. After combining the relevant constraints we find that these models cannot explain the ATLAS excess. |
hep-ph/0104019 | Ilya Narodetskii | I.M.Narodetskii, M.A.Trusov (ITEP, Moscow, Russia) | The heavy baryons in the nonperturbative string approach | 21 pages; to appear in Phys. Atom. Nucl | Phys.Atom.Nucl. 65 (2002) 917-924; Yad.Fiz. 65 (2002) 949-955 | 10.1134/1.1481486 | null | hep-ph | null | We present some piloting calculations of the short-range correlation
coefficients for the light and heavy baryons and masses of the doubly heavy
baryons $\Xi_{QQ'}$ and $\Omega_{QQ'}$ ($Q,Q'=c,b$) in the framework of the
simple approximation within the nonperturbative QCD approach.
| [
{
"created": "Mon, 2 Apr 2001 15:05:09 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jun 2001 10:47:20 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Narodetskii",
"I. M.",
"",
"ITEP, Moscow, Russia"
],
[
"Trusov",
"M. A.",
"",
"ITEP, Moscow, Russia"
]
] | We present some piloting calculations of the short-range correlation coefficients for the light and heavy baryons and masses of the doubly heavy baryons $\Xi_{QQ'}$ and $\Omega_{QQ'}$ ($Q,Q'=c,b$) in the framework of the simple approximation within the nonperturbative QCD approach. |
1411.7699 | Jamie Tattersall Dr | Catherine Bernaciak, Tilman Plehn, Peter Schichtel, Jamie Tattersall | Spying an invisible Higgs | 10 pages, 2 figures | Phys. Rev. D 91, 035024 (2015) | 10.1103/PhysRevD.91.035024 | IPPP/14/101, DCPT/14/201, MCnet-14-23 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the potential of multivariate techniques to improve the LHC
search for invisible Higgs decays in weak boson fusion. We find that in the
coming runs the LHC will be able to probe an invisible Higgs width of 28%
within a year and 3.5% during a high luminosity run. A significant improvement
over these estimates requires an analysis of QCD radiation patterns down to 10
GeV. Such an analysis can improve the reach at the high luminosity run to 2%.
Throughout our analysis we employ a conservative, data driven background
determination.
| [
{
"created": "Thu, 27 Nov 2014 21:00:03 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Bernaciak",
"Catherine",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Schichtel",
"Peter",
""
],
[
"Tattersall",
"Jamie",
""
]
] | We investigate the potential of multivariate techniques to improve the LHC search for invisible Higgs decays in weak boson fusion. We find that in the coming runs the LHC will be able to probe an invisible Higgs width of 28% within a year and 3.5% during a high luminosity run. A significant improvement over these estimates requires an analysis of QCD radiation patterns down to 10 GeV. Such an analysis can improve the reach at the high luminosity run to 2%. Throughout our analysis we employ a conservative, data driven background determination. |
hep-ph/9907250 | Boris B. Levtchenko | B. B. Levchenko (INP MSU Moscow) | A possible alternative to the Breit frame in DIS | 5 pages, 2 figures | Proc. 6th Int. Workshop on Deep Inelastic Scattering and QCD: DIS
98, (Brussels, 4-8 April 1998), Eds. G.H.Coremans and R.Roosen, World
Scientific 1998, p.523 | null | null | hep-ph | null | A new Lorentz frame for DIS jet finding is suggested.
| [
{
"created": "Tue, 6 Jul 1999 12:23:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Levchenko",
"B. B.",
"",
"INP MSU Moscow"
]
] | A new Lorentz frame for DIS jet finding is suggested. |
1509.04057 | Mauro Napsuciale | David Delepine, Mauro Napsuciale and Eduardo Peinado | Effects of an H-mu-tau coupling in quarkonium lepton flavor violation
decays | 7 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the consistency of a possible non-vanishing coupling
$H\mu \tau $ of the order of $3.6\times 10^{-3}$ as pointed recently by the CMS
and ATLAS collaborations, with measured lepton flavor violation processes
involving quarkonium. We show that the most promising channel to confirm this
excess is to look for the lepton flavor tau decay into a $f_0$ and $\mu$ where
the experimental limit could strongly improved with the new B factories as
Belle II.
| [
{
"created": "Mon, 14 Sep 2015 12:32:58 GMT",
"version": "v1"
}
] | 2015-09-15 | [
[
"Delepine",
"David",
""
],
[
"Napsuciale",
"Mauro",
""
],
[
"Peinado",
"Eduardo",
""
]
] | In this work we study the consistency of a possible non-vanishing coupling $H\mu \tau $ of the order of $3.6\times 10^{-3}$ as pointed recently by the CMS and ATLAS collaborations, with measured lepton flavor violation processes involving quarkonium. We show that the most promising channel to confirm this excess is to look for the lepton flavor tau decay into a $f_0$ and $\mu$ where the experimental limit could strongly improved with the new B factories as Belle II. |
2007.14553 | Xing-Gang Wu | Huai-Min Yu, Wen-Long Sang, Xu-Dong Huang, Jun Zeng, Xing-Gang Wu and
Stanley J. Brodsky | Scale-Fixed Predictions for $\gamma + \eta_c$ production in
electron-positron collisions at NNLO in perturbative QCD | 8 pages, 5 figures. Discussions improved and references updated.
Revised version to be published in JHEP | null | 10.1007/JHEP01(2021)131 | OSTI ID = 1643687 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper, we present QCD predictions for $\eta_{c} + \gamma$ production
at an electron-position collider up to next-to-next-to-leading order (NNLO)
accuracy without renormalization scale ambiguities. The NNLO total
cross-section for $e^{+}+e^{-}\to\gamma+\eta_{c}$ using the conventional
scale-setting approach has large renormalization scale ambiguities, usually
estimated by choosing the renormalization scale to be the $e^+ e^-$
center-of-mass collision energy $\sqrt{s}$. The Principle of Maximum
Conformality (PMC) provides a systematic way to eliminate such renormalization
scale ambiguities by summing the nonconformal $\beta$ contributions into the
QCD coupling $\alpha_s(Q^2)$. The renormalization group equation then sets the
value of $\alpha_s$ for the process. The PMC renormalization scale reflects the
virtuality of the underlying process, and the resulting predictions satisfy all
of the requirements of renormalization group invariance, including
renormalization scheme invariance. After applying the PMC, we obtain a
scale-and-scheme independent prediction, $\sigma|_{\rm NNLO, PMC}\simeq 41.18$
fb for $\sqrt{s}$=10.6 GeV. The resulting pQCD series matches the series for
conformal theory and thus has no divergent renormalon contributions. The large
$K$ factor which contributes to this process reinforces the importance of
uncalculated NNNLO and higher-order terms. Using the PMC scale-and-scheme
independent conformal series and the $\rm Pad\acute{e}$ approximation approach,
we predict $\sigma|_{\rm NNNLO, PMC+Pade} \simeq 21.36$ fb, which is consistent
with the recent BELLE measurement $\sigma^{\rm obs}$=$16.58^{+10.51}_{-9.93}$
fb at $\sqrt{s} \simeq 10.6$ GeV. This procedure also provides a first estimate
of the NNNLO contribution.
| [
{
"created": "Wed, 29 Jul 2020 02:20:00 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2020 08:03:49 GMT",
"version": "v2"
}
] | 2021-02-24 | [
[
"Yu",
"Huai-Min",
""
],
[
"Sang",
"Wen-Long",
""
],
[
"Huang",
"Xu-Dong",
""
],
[
"Zeng",
"Jun",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Brodsky",
"Stanley J.",
""
]
] | In the paper, we present QCD predictions for $\eta_{c} + \gamma$ production at an electron-position collider up to next-to-next-to-leading order (NNLO) accuracy without renormalization scale ambiguities. The NNLO total cross-section for $e^{+}+e^{-}\to\gamma+\eta_{c}$ using the conventional scale-setting approach has large renormalization scale ambiguities, usually estimated by choosing the renormalization scale to be the $e^+ e^-$ center-of-mass collision energy $\sqrt{s}$. The Principle of Maximum Conformality (PMC) provides a systematic way to eliminate such renormalization scale ambiguities by summing the nonconformal $\beta$ contributions into the QCD coupling $\alpha_s(Q^2)$. The renormalization group equation then sets the value of $\alpha_s$ for the process. The PMC renormalization scale reflects the virtuality of the underlying process, and the resulting predictions satisfy all of the requirements of renormalization group invariance, including renormalization scheme invariance. After applying the PMC, we obtain a scale-and-scheme independent prediction, $\sigma|_{\rm NNLO, PMC}\simeq 41.18$ fb for $\sqrt{s}$=10.6 GeV. The resulting pQCD series matches the series for conformal theory and thus has no divergent renormalon contributions. The large $K$ factor which contributes to this process reinforces the importance of uncalculated NNNLO and higher-order terms. Using the PMC scale-and-scheme independent conformal series and the $\rm Pad\acute{e}$ approximation approach, we predict $\sigma|_{\rm NNNLO, PMC+Pade} \simeq 21.36$ fb, which is consistent with the recent BELLE measurement $\sigma^{\rm obs}$=$16.58^{+10.51}_{-9.93}$ fb at $\sqrt{s} \simeq 10.6$ GeV. This procedure also provides a first estimate of the NNNLO contribution. |
hep-ph/0303255 | Goran Senjanovic | Goran Senjanovic | The role of baryon and lepton numbers in the physics beyond the standard
model | Based on the plenary talk given at SUSY'01, Dubna, Russia, and the
talk given at Gran Sasso Extended Workshop on Astroparticle Physics, July
2002 | null | null | null | hep-ph | null | I review the role played by baryon and lepton numbers and their discrete
subgroups in determining the low energy effective theory relevant for TeV
physics.
| [
{
"created": "Sun, 30 Mar 2003 18:21:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Senjanovic",
"Goran",
""
]
] | I review the role played by baryon and lepton numbers and their discrete subgroups in determining the low energy effective theory relevant for TeV physics. |
2112.09152 | Jessica Howard | Jessica N. Howard, Seyda Ipek, Tim M.P. Tait, Jessica Turner | Dark Matter Freeze-out during $\mathrm{SU}(2)_{\rm L}$ Confinement | 22 pages, 4 figures, 2 tables | null | 10.1007/JHEP02(2022)047 | UCI-HEP-TR-2021-23, IPPP/21/52 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility that dark matter is a pair of vector-like
fermionic $\mathrm{SU}(2)_{\rm L}$ doublets and propose a novel mechanism of
dark matter production that proceeds through the confinement of the weak sector
of the Standard Model. This confinement phase causes the Standard Model
doublets and dark matter to confine into pions. The dark pions freeze-out
before the weak sector deconfines and generate a relic abundance of dark
matter. We solve the Boltzmann equations for this scenario to determine the
scale of confinement and constituent dark matter mass required to produce the
observed relic density. We determine which regions of this parameter space
evade direct detection, collider bounds, and successfully produce the observed
relic density of dark matter. For a TeV scale pair of vector-like fermionic
$\mathrm{SU}(2)_{\rm L}$ doublets, we find the weak confinement scale to be
$\sim 700$ TeV.
| [
{
"created": "Thu, 16 Dec 2021 19:00:52 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Howard",
"Jessica N.",
""
],
[
"Ipek",
"Seyda",
""
],
[
"Tait",
"Tim M. P.",
""
],
[
"Turner",
"Jessica",
""
]
] | We explore the possibility that dark matter is a pair of vector-like fermionic $\mathrm{SU}(2)_{\rm L}$ doublets and propose a novel mechanism of dark matter production that proceeds through the confinement of the weak sector of the Standard Model. This confinement phase causes the Standard Model doublets and dark matter to confine into pions. The dark pions freeze-out before the weak sector deconfines and generate a relic abundance of dark matter. We solve the Boltzmann equations for this scenario to determine the scale of confinement and constituent dark matter mass required to produce the observed relic density. We determine which regions of this parameter space evade direct detection, collider bounds, and successfully produce the observed relic density of dark matter. For a TeV scale pair of vector-like fermionic $\mathrm{SU}(2)_{\rm L}$ doublets, we find the weak confinement scale to be $\sim 700$ TeV. |
2004.09511 | David Dunsky | Jeff A. Dror, David Dunsky, Lawrence J. Hall, Keisuke Harigaya | Sterile Neutrino Dark Matter in Left-Right Theories | 31 pages, 5 figures. Matches published version. Added references and
clarifications | null | 10.1007/JHEP07(2020)168 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $SU(2)_L \times SU(2)_R$ gauge symmetry requires three right-handed neutrinos
($ N _i $), one of which, $N_1$, can be sufficiently stable to be dark matter.
In the early universe, $ W _R $ exchange with the Standard Model thermal bath
keeps the right-handed neutrinos in thermal equilibrium at high temperatures.
$N_1$ can make up all of dark matter if they freeze-out while relativistic and
are mildly diluted by subsequent decays of a long-lived and heavier
right-handed neutrino, $N_2$. We systematically study this parameter space,
constraining the symmetry breaking scale of $SU(2)_R$ and the mass of $N_1$ to
a triangle in the $(v_R,M_1)$ plane, with $v_R = (10^6 - 3 \times 10^{12})$ GeV
and $M_1 = (2\, {\rm keV} - 1 \, {\rm MeV)}$. Much of this triangle can be
probed by signals of warm dark matter, especially if leptogenesis from $N_2$
decay yields the observed baryon asymmetry. The minimal value of $v_R$ is
increased to $10^8 \, {\rm GeV}$ for doublet breaking of $SU(2)_R$, and further
to $10^9 \, {\rm GeV}$ if leptogenesis occurs via $N_2$ decay, while the upper
bound on $M_1$ is reduced to 100 keV. In addition, there is a component of hot
$N_1$ dark matter resulting from the late decay of $N_2 \rightarrow N_1 \ell^+
\ell^-$ that can be probed by future cosmic microwave background observations.
Interestingly, the range of $v_R$ allows both precision gauge coupling
unification and the Higgs Parity understanding of the vanishing of the Standard
Model Higgs quartic at scale $v_R$. Finally, we study freeze-in production of
$N_1$ dark matter via the $W_R$ interaction, which allows a much wider range of
$(v_R,M_1)$.
| [
{
"created": "Mon, 20 Apr 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2020 20:33:44 GMT",
"version": "v2"
}
] | 2020-09-04 | [
[
"Dror",
"Jeff A.",
""
],
[
"Dunsky",
"David",
""
],
[
"Hall",
"Lawrence J.",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | $SU(2)_L \times SU(2)_R$ gauge symmetry requires three right-handed neutrinos ($ N _i $), one of which, $N_1$, can be sufficiently stable to be dark matter. In the early universe, $ W _R $ exchange with the Standard Model thermal bath keeps the right-handed neutrinos in thermal equilibrium at high temperatures. $N_1$ can make up all of dark matter if they freeze-out while relativistic and are mildly diluted by subsequent decays of a long-lived and heavier right-handed neutrino, $N_2$. We systematically study this parameter space, constraining the symmetry breaking scale of $SU(2)_R$ and the mass of $N_1$ to a triangle in the $(v_R,M_1)$ plane, with $v_R = (10^6 - 3 \times 10^{12})$ GeV and $M_1 = (2\, {\rm keV} - 1 \, {\rm MeV)}$. Much of this triangle can be probed by signals of warm dark matter, especially if leptogenesis from $N_2$ decay yields the observed baryon asymmetry. The minimal value of $v_R$ is increased to $10^8 \, {\rm GeV}$ for doublet breaking of $SU(2)_R$, and further to $10^9 \, {\rm GeV}$ if leptogenesis occurs via $N_2$ decay, while the upper bound on $M_1$ is reduced to 100 keV. In addition, there is a component of hot $N_1$ dark matter resulting from the late decay of $N_2 \rightarrow N_1 \ell^+ \ell^-$ that can be probed by future cosmic microwave background observations. Interestingly, the range of $v_R$ allows both precision gauge coupling unification and the Higgs Parity understanding of the vanishing of the Standard Model Higgs quartic at scale $v_R$. Finally, we study freeze-in production of $N_1$ dark matter via the $W_R$ interaction, which allows a much wider range of $(v_R,M_1)$. |
hep-ph/9212314 | Myron Bander | Myron Bander and H. R. Rubinstein | On the 545 keV Line in the Spectrum of the Crab Nebula | pages (set in Revtex II) | null | null | null | hep-ph | null | The GRANAT group (R. Sunyaev {\it et al.\/}, Central Bureau of Astronomical
Telegrams, International Astronomical Union, Circular No.~5481) recently
reported the observation of a $(545 \pm 11)$ keV line in the spectrum of the
Crab Nebula. It is tempting to associate this with the positron-electron
annihilation line at 511 keV. If this line originates from some transition at
the surface of the neutron star in the Crab, we expect a red shift of around
10\% rather then the observed blue shift of $\sim 35$ keV; in fact, this
gravitational red shift implies that the natural frequency of the observed line
is also 10\% higher, or around 600 keV. In this article we shall present a
mechanism for generating such a split from 511 keV. For this mechanism to be
successful we require: (a) surface magnetic fields, in the annihilation region,
to be $(3-8)\times 10^{12}$~G and to point in our direction, (b) surface
densities of $(10^5-10^6)$ g/cc. Both of these assumptions are consistent with
pulsar models.
| [
{
"created": "Wed, 30 Dec 1992 01:03:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bander",
"Myron",
""
],
[
"Rubinstein",
"H. R.",
""
]
] | The GRANAT group (R. Sunyaev {\it et al.\/}, Central Bureau of Astronomical Telegrams, International Astronomical Union, Circular No.~5481) recently reported the observation of a $(545 \pm 11)$ keV line in the spectrum of the Crab Nebula. It is tempting to associate this with the positron-electron annihilation line at 511 keV. If this line originates from some transition at the surface of the neutron star in the Crab, we expect a red shift of around 10\% rather then the observed blue shift of $\sim 35$ keV; in fact, this gravitational red shift implies that the natural frequency of the observed line is also 10\% higher, or around 600 keV. In this article we shall present a mechanism for generating such a split from 511 keV. For this mechanism to be successful we require: (a) surface magnetic fields, in the annihilation region, to be $(3-8)\times 10^{12}$~G and to point in our direction, (b) surface densities of $(10^5-10^6)$ g/cc. Both of these assumptions are consistent with pulsar models. |
1206.5150 | Maria Gomez-Rocha | Mar\'ia G\'omez-Rocha and Wolfgang Schweiger | Electroweak hadron structure in point-form dynamics -- heavy-light
systems | 6 pages, 3 figures, talk presented by M. G\'omez-Rocha at the Sixth
International Conference on Quarks and Nuclear Physics (QNP2012), April
16-20, 2012, Palaiseau, France | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general formalism that uses the point form of relativistic
Hamiltonian dynamics to describe the electroweak structure of heavy-light
mesons within constituent quark models. We study the heavy quark limit (i.e.
$m_Q\to \infty$) and check that the predictions of heavy quark symmetry are
satisfied. A simple analytic expressions is given for the Isgur-Wise function.
In addition, cluster properties and the relation of our approach to front form
calculations are discussed.
| [
{
"created": "Fri, 22 Jun 2012 14:08:57 GMT",
"version": "v1"
}
] | 2012-06-25 | [
[
"Gómez-Rocha",
"María",
""
],
[
"Schweiger",
"Wolfgang",
""
]
] | We present a general formalism that uses the point form of relativistic Hamiltonian dynamics to describe the electroweak structure of heavy-light mesons within constituent quark models. We study the heavy quark limit (i.e. $m_Q\to \infty$) and check that the predictions of heavy quark symmetry are satisfied. A simple analytic expressions is given for the Isgur-Wise function. In addition, cluster properties and the relation of our approach to front form calculations are discussed. |
2205.10485 | Tong-Tong Wang | Tong-Tong Wang, Shu-Min Zhao, Jian-Fei Zhang, Xing-Xing Dong, Tai-Fu
Feng | Lepton flavor violating decays $l_j\rightarrow{l_i\gamma}$ in the
$U(1)_X$SSM model within the Mass Insertion Approximation | 24pages,23figures. arXiv admin note: text overlap with
arXiv:2111.04908 | null | 10.1140/epjc/s10052-022-10613-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Three singlet new Higgs superfields and right-handed neutrinos are added to
MSSM to obtain $U(1)_X$SSM model. Its local gauge group is $SU(3)_C\times
SU(2)_L \times U(1)_Y \times U(1)_X$. In the framework of $U(1)_X$SSM, we study
muon anomalous magnetic moment and lepton flavor violating decays
$l_j\rightarrow{l_i\gamma}(j=2,3;i=1,2)$ within the Mass Insertion
Approximation(MIA). Through the MIA method, we can find the parameters that
directly affect the analytical result of the lepton flavor violating decays
$l_j\rightarrow{l_i\gamma}$, which make our work more convenient. We want to
provide a set of simple analytic formulas for the form factors and the
associated effective vertices, that may be very useful for future
phenomenological studies of the lepton flavor violating decays. According to
the accuracy of the numerical results which the influence of different
sensitive parameters, we come to the conclusion that the non-diagonal elements
which correspond to the generations of the initial lepton and final lepton are
main sensitive parameters and lepton flavor violation(LFV) sources. This work
can provide a clear signal of new physics(NP).
| [
{
"created": "Sat, 21 May 2022 01:53:02 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jun 2022 12:17:27 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Jul 2022 13:23:23 GMT",
"version": "v3"
}
] | 2022-08-10 | [
[
"Wang",
"Tong-Tong",
""
],
[
"Zhao",
"Shu-Min",
""
],
[
"Zhang",
"Jian-Fei",
""
],
[
"Dong",
"Xing-Xing",
""
],
[
"Feng",
"Tai-Fu",
""
]
] | Three singlet new Higgs superfields and right-handed neutrinos are added to MSSM to obtain $U(1)_X$SSM model. Its local gauge group is $SU(3)_C\times SU(2)_L \times U(1)_Y \times U(1)_X$. In the framework of $U(1)_X$SSM, we study muon anomalous magnetic moment and lepton flavor violating decays $l_j\rightarrow{l_i\gamma}(j=2,3;i=1,2)$ within the Mass Insertion Approximation(MIA). Through the MIA method, we can find the parameters that directly affect the analytical result of the lepton flavor violating decays $l_j\rightarrow{l_i\gamma}$, which make our work more convenient. We want to provide a set of simple analytic formulas for the form factors and the associated effective vertices, that may be very useful for future phenomenological studies of the lepton flavor violating decays. According to the accuracy of the numerical results which the influence of different sensitive parameters, we come to the conclusion that the non-diagonal elements which correspond to the generations of the initial lepton and final lepton are main sensitive parameters and lepton flavor violation(LFV) sources. This work can provide a clear signal of new physics(NP). |
0903.1239 | John R. Hiller | S.S. Chabysheva, J.R. Hiller | Zero momentum modes in discrete light-cone quantization | 10 pages, LaTeX/REVTeX, no figures; typos corrected, references
added, discussion of zero-mode loops added | Phys.Rev.D79:096012,2009 | 10.1103/PhysRevD.79.096012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the constrained zero modes found in the application of discrete
light-cone quantization (DLCQ) to the nonperturbative solution of quantum field
theories. These modes are usually neglected for simplicity, but we show that
their inclusion can be relatively straightforward, and, what is more, that they
are useful for nonperturbative calculations of field-theoretic spectra. In
particular, inclusion of zero modes improves the convergence of the numerical
calculation and makes possible the direct calculation of vacuum expectation
values, even when the zero modes are determined dynamically. We also comment on
zero-mode contributions not included by DLCQ, namely zero-mode loops.
| [
{
"created": "Fri, 6 Mar 2009 16:04:13 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2009 15:37:15 GMT",
"version": "v2"
}
] | 2009-07-30 | [
[
"Chabysheva",
"S. S.",
""
],
[
"Hiller",
"J. R.",
""
]
] | We consider the constrained zero modes found in the application of discrete light-cone quantization (DLCQ) to the nonperturbative solution of quantum field theories. These modes are usually neglected for simplicity, but we show that their inclusion can be relatively straightforward, and, what is more, that they are useful for nonperturbative calculations of field-theoretic spectra. In particular, inclusion of zero modes improves the convergence of the numerical calculation and makes possible the direct calculation of vacuum expectation values, even when the zero modes are determined dynamically. We also comment on zero-mode contributions not included by DLCQ, namely zero-mode loops. |
hep-ph/0307231 | Bernard Pire | F. Cano (SPhN-DAPNIA-CEA Saclay) and B. Pire (CPhT, ecole
Polytechnique) | Deep Electroproduction of Photons and Mesons on the Deuteron | 15 pages, 15 figures,revised version, minor changes, to be published
in EPJA. Misprint in definitionof charge asymmetry corrected | Eur.Phys.J.A19:423-438,2004 | 10.1140/epja/i2003-10127-x | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study deeply virtual Compton scattering and deep exclusive meson
electroproduction on a deuteron target. We model the Generalized Quark
Distributions in the deuteron by using the impulse approximation for the lowest
Fock-space state on the light-cone. We study the properties of the resulting
GPDs, and verify that sum rules violations are quite small in the impulse
approximation. Numerical predictions are given for the unpolarized cross
sections and polarization asymmetries for the kinematical regimes relevant for
JLab experiments and for HERMES at HERA. We conclude that the signal of
coherent scattering on the deuteron is comparable to the one on the proton at
least for low momentum transfer, providing support to the feasibility of the
experiments. The short distance structure of the deuteron may thus be
scrutinized in the near future.
| [
{
"created": "Fri, 18 Jul 2003 07:47:20 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 2003 09:27:13 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Jan 2010 18:36:04 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Cano",
"F.",
"",
"SPhN-DAPNIA-CEA Saclay"
],
[
"Pire",
"B.",
"",
"CPhT, ecole\n Polytechnique"
]
] | We study deeply virtual Compton scattering and deep exclusive meson electroproduction on a deuteron target. We model the Generalized Quark Distributions in the deuteron by using the impulse approximation for the lowest Fock-space state on the light-cone. We study the properties of the resulting GPDs, and verify that sum rules violations are quite small in the impulse approximation. Numerical predictions are given for the unpolarized cross sections and polarization asymmetries for the kinematical regimes relevant for JLab experiments and for HERMES at HERA. We conclude that the signal of coherent scattering on the deuteron is comparable to the one on the proton at least for low momentum transfer, providing support to the feasibility of the experiments. The short distance structure of the deuteron may thus be scrutinized in the near future. |
hep-ph/9702211 | Ivan Schmidt | Ivan Schmidt (Universidad Federico Santa Maria, Valparaiso, Chile) | Antihydrogen | 15 pages, Latex. To appear in the proceedings of the First Latin
American Symposium on High Enery Physics (SILAFAE), M\'erida, M\'exico,
October 30-November 6, 1996 | null | 10.1063/1.53213 | USM-TH-69 | hep-ph | null | CERN announced in January 1996 the detection of the first eleven atoms of
antimatter ever produced. The experiment was based on a method proposed earlier
by S. Brodsky, C. Munger and I. Schmidt, and which furthermore predicted
exactly the number of atoms that were detected for the particular conditions of
the experiment. The study of antihydrogen affords science the opportunity to
continue research on the symmetry between matter and antimatter. In this talk
the importance of antihydrogen as a basic physical system is discussed.
Different production methods that have been tried in the past are briefly
presented, and the method that was used in the CERN experiment is analyzed in
detail. It consists in producing antihydrogen by circulating a beam of an
antiproton ring through an internal gas target. In the Coulomb field of a
nucleus, an electron-positron pair is created, and antihydrogen will form when
the positron is created in a bound rather that a continuum state about the
antiproton. The theoretical calculation of the production cross section is
presented in detail. A discussion of the detection systems used both in the
CERN experiment and in another similar experiment that is right now underway at
Fermilab are also given. Finally I present and discuss possible future
experiments using antihydrogen, including the measurement of the antihydrogen
Lamb shift.
| [
{
"created": "Fri, 31 Jan 1997 21:13:40 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Schmidt",
"Ivan",
"",
"Universidad Federico Santa Maria, Valparaiso, Chile"
]
] | CERN announced in January 1996 the detection of the first eleven atoms of antimatter ever produced. The experiment was based on a method proposed earlier by S. Brodsky, C. Munger and I. Schmidt, and which furthermore predicted exactly the number of atoms that were detected for the particular conditions of the experiment. The study of antihydrogen affords science the opportunity to continue research on the symmetry between matter and antimatter. In this talk the importance of antihydrogen as a basic physical system is discussed. Different production methods that have been tried in the past are briefly presented, and the method that was used in the CERN experiment is analyzed in detail. It consists in producing antihydrogen by circulating a beam of an antiproton ring through an internal gas target. In the Coulomb field of a nucleus, an electron-positron pair is created, and antihydrogen will form when the positron is created in a bound rather that a continuum state about the antiproton. The theoretical calculation of the production cross section is presented in detail. A discussion of the detection systems used both in the CERN experiment and in another similar experiment that is right now underway at Fermilab are also given. Finally I present and discuss possible future experiments using antihydrogen, including the measurement of the antihydrogen Lamb shift. |
hep-ph/0607194 | Eric Laenen | Eric Laenen and Lorenzo Magnea | Refining threshold resummations | Presented at 8th DESY Workshop on Elementary Particle Theory: Loops
and Legs in Quantum Field Theory, Eisenach, Germany, 23-28 Apr 2006 | Nucl.Phys.Proc.Suppl.160:240-244,2006 | 10.1016/j.nuclphysbps.2006.09.113 | null | hep-ph | null | We describe some recent refinements of the techniques of threshold
resummation, with emphasis on the usefulness of dimensional regularization when
applied to nonabelian exponentiation. Threshold resummation is now under
theoretical control for DIS and electroweak annihilation cross sections all the
way to the fourth tower of logarithms and up to corrections suppressed by
powers of the threshold variable.
| [
{
"created": "Tue, 18 Jul 2006 07:21:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Laenen",
"Eric",
""
],
[
"Magnea",
"Lorenzo",
""
]
] | We describe some recent refinements of the techniques of threshold resummation, with emphasis on the usefulness of dimensional regularization when applied to nonabelian exponentiation. Threshold resummation is now under theoretical control for DIS and electroweak annihilation cross sections all the way to the fourth tower of logarithms and up to corrections suppressed by powers of the threshold variable. |
hep-ph/0301016 | Kopylov | Anatoly Kopylov, Valery Petukhov | A Lithium Experiment as the Stringent Test of the Theory of Stellar
Evolution | 8 pages, 4 figures | null | null | null | hep-ph | null | We show that a lithium experiment has a potential to confirm or reject the
value 1.5% of the solar luminosity attributed to a CNO-cycle by the SSM and to
prove that the difference between total energy release of the Sun and what is
produced in a hydrogen sequence is really produced in CNO cycle. This will be
the stringent test of the theory of stellar evolution and the termination of
the long-standing goal - the neutrino spectroscopy of the interior of the Sun.
At the present time one can see no other way to solve this task, it can be
accomplished only with a lithium detector utilizing its high sensitivity to
CNO-neutrinos and very high accuracy in the theoretical evaluation of the
cross-section of neutrino capture by 7Li. The analyses shows that although a
lithium detector is a radiochemical one, principally it is possible to find
separately the fluxes of 13N- and 15O-neutrinos.
| [
{
"created": "Sat, 4 Jan 2003 08:39:13 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jan 2003 09:36:48 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kopylov",
"Anatoly",
""
],
[
"Petukhov",
"Valery",
""
]
] | We show that a lithium experiment has a potential to confirm or reject the value 1.5% of the solar luminosity attributed to a CNO-cycle by the SSM and to prove that the difference between total energy release of the Sun and what is produced in a hydrogen sequence is really produced in CNO cycle. This will be the stringent test of the theory of stellar evolution and the termination of the long-standing goal - the neutrino spectroscopy of the interior of the Sun. At the present time one can see no other way to solve this task, it can be accomplished only with a lithium detector utilizing its high sensitivity to CNO-neutrinos and very high accuracy in the theoretical evaluation of the cross-section of neutrino capture by 7Li. The analyses shows that although a lithium detector is a radiochemical one, principally it is possible to find separately the fluxes of 13N- and 15O-neutrinos. |
hep-ph/0011258 | Alexander Lenz | Alexander Lenz | Some comments on the missing charm puzzle | Talk given at the workshop on Heavy Flavour and CP violation in
Durham, GB | null | null | null | hep-ph hep-ex | null | In this talk we summarize the status of theoretical predictions for the
average number of charm quarks in a B-hadron decay.
| [
{
"created": "Tue, 21 Nov 2000 09:16:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lenz",
"Alexander",
""
]
] | In this talk we summarize the status of theoretical predictions for the average number of charm quarks in a B-hadron decay. |
1211.4359 | Oscar Castillo Felisola Dr. | Oscar Castillo-Felisola and Cristobal Corral and Ivan Schmidt and
Alfonso Zerwekh | Phenomenological Constraints to Dimensionality of the Spacetime with
Torsion | 4 pages; To be submitted to PRD | null | null | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the recent limits established by ATLAS to the contact four-fermion
interaction, bounds on the size of the extra dimensions of space-time have been
found, by assuming that the contact interactions come through the inclusion of
torsion in the higher dimensional theory. For two extra dimensions, the limits
are comparable to those in the literature, while for higher dimensional
space-time, the volume of the extra dimensions is strongly constrained.
| [
{
"created": "Mon, 19 Nov 2012 10:54:53 GMT",
"version": "v1"
}
] | 2012-11-20 | [
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Corral",
"Cristobal",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Zerwekh",
"Alfonso",
""
]
] | Using the recent limits established by ATLAS to the contact four-fermion interaction, bounds on the size of the extra dimensions of space-time have been found, by assuming that the contact interactions come through the inclusion of torsion in the higher dimensional theory. For two extra dimensions, the limits are comparable to those in the literature, while for higher dimensional space-time, the volume of the extra dimensions is strongly constrained. |
1512.03458 | Martin Bauer | Martin Bauer, Marcela Carena, Katrin Gemmler | Creating the Fermion Mass Hierarchies with Multiple Higgs Bosons | 5 pages, 2 figures | Phys. Rev. D 94, 115030 (2016) | 10.1103/PhysRevD.94.115030 | FERMILAB-PUB-15-537-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the Higgs boson discovery, it is established that the Higgs mechanism
explains electroweak symmetry breaking and generates the masses of all
particles in the Standard Model, with the possible exception of neutrino
masses. The hierarchies among fermion masses and mixing angles remain however
unexplained. We propose a new class of two Higgs doublet models in which a
flavor symmetry broken at the electroweak scale addresses this problem. The
models are strongly constrained by electroweak precision tests and the fact
that they produce modifications to Higgs couplings and flavor changing neutral
currents; they are also constrained by collider searches for extra scalar
bosons. The surviving models are very predictive, implying unavoidable new
physics signals at the CERN Large Hadron Collider, e.g. extra Higgs Bosons with
masses $M < 700$ GeV.
| [
{
"created": "Thu, 10 Dec 2015 21:56:36 GMT",
"version": "v1"
}
] | 2017-01-04 | [
[
"Bauer",
"Martin",
""
],
[
"Carena",
"Marcela",
""
],
[
"Gemmler",
"Katrin",
""
]
] | After the Higgs boson discovery, it is established that the Higgs mechanism explains electroweak symmetry breaking and generates the masses of all particles in the Standard Model, with the possible exception of neutrino masses. The hierarchies among fermion masses and mixing angles remain however unexplained. We propose a new class of two Higgs doublet models in which a flavor symmetry broken at the electroweak scale addresses this problem. The models are strongly constrained by electroweak precision tests and the fact that they produce modifications to Higgs couplings and flavor changing neutral currents; they are also constrained by collider searches for extra scalar bosons. The surviving models are very predictive, implying unavoidable new physics signals at the CERN Large Hadron Collider, e.g. extra Higgs Bosons with masses $M < 700$ GeV. |
2109.02653 | Stefano Forte | Richard D. Ball, Stefano Carrazza, Juan Cruz-Martinez, Luigi Del
Debbio, Stefano Forte, Tommaso Giani, Shayan Iranipour, Zahari Kassabov, Jose
I. Latorre, Emanuele R. Nocera, Rosalyn L. Pearson, Juan Rojo, Roy Stegeman,
Christopher Schwan, Maria Ubiali, Cameron Voisey, and Michael Wilson | The Path to Proton Structure at One-Percent Accuracy | 139 pages, more than 60 figures. A companion paper describes the
open-source NNPDF code. Figs 9.1 and 9.3 replaced after correction of a
plotting bug (thanks to J.Huston and G.Salam for spotting it). A few more
typos corrected and a reference updated. Final published version. References
updated, several typos corrected, 72 issues raised by the referee addressed | null | 10.1140/epjc/s10052-022-10328-7 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new set of parton distribution functions (PDFs) based on a fully
global dataset and machine learning techniques: NNPDF4.0. We expand the
NNPDF3.1 determination with 44 new datasets, mostly from the LHC. We derive a
novel methodology through hyperparameter optimisation, leading to an efficient
fitting algorithm built upon stochastic gradient descent. We use NNLO QCD
calculations and account for NLO electroweak corrections and nuclear
uncertainties. Theoretical improvements in the PDF description include a
systematic implementation of positivity constraints and integrability of sum
rules. We validate our methodology by means of closure tests and "future tests"
(i.e. tests of backward and forward data compatibility), and assess its
stability, specifically upon changes of PDF parametrization basis. We study the
internal compatibility of our dataset, and investigate the dependence of
results both upon the choice of input dataset and of fitting methodology. We
perform a first study of the phenomenological implications of NNPDF4.0 on
representative LHC processes. The software framework used to produce NNPDF4.0
is made available as an open-source package together with documentation and
examples.
| [
{
"created": "Mon, 6 Sep 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 2021 16:34:05 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Nov 2021 18:39:31 GMT",
"version": "v3"
},
{
"created": "Tue, 31 May 2022 17:13:08 GMT",
"version": "v4"
}
] | 2022-06-01 | [
[
"Ball",
"Richard D.",
""
],
[
"Carrazza",
"Stefano",
""
],
[
"Cruz-Martinez",
"Juan",
""
],
[
"Del Debbio",
"Luigi",
""
],
[
"Forte",
"Stefano",
""
],
[
"Giani",
"Tommaso",
""
],
[
"Iranipour",
"Shayan",
""... | We present a new set of parton distribution functions (PDFs) based on a fully global dataset and machine learning techniques: NNPDF4.0. We expand the NNPDF3.1 determination with 44 new datasets, mostly from the LHC. We derive a novel methodology through hyperparameter optimisation, leading to an efficient fitting algorithm built upon stochastic gradient descent. We use NNLO QCD calculations and account for NLO electroweak corrections and nuclear uncertainties. Theoretical improvements in the PDF description include a systematic implementation of positivity constraints and integrability of sum rules. We validate our methodology by means of closure tests and "future tests" (i.e. tests of backward and forward data compatibility), and assess its stability, specifically upon changes of PDF parametrization basis. We study the internal compatibility of our dataset, and investigate the dependence of results both upon the choice of input dataset and of fitting methodology. We perform a first study of the phenomenological implications of NNPDF4.0 on representative LHC processes. The software framework used to produce NNPDF4.0 is made available as an open-source package together with documentation and examples. |
2303.13383 | Anil Thapa | Julian Heeck, Anil Thapa | Zee-model predictions for lepton flavor violation | 6 pages, 4 figures, Updated references, matches published version | null | 10.1016/j.physletb.2023.137910 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Zee model provides a simple model for one-loop Majorana neutrino masses.
The new scalars can furthermore explain the long-standing deviation in the
muon's magnetic moment and the recent CDF measurement of the $W$-boson mass.
Together, these observations yield predictions for lepton flavor violating
processes that are almost entirely testable in the near future. The remaining
parameter space makes testable predictions for neutrino masses.
| [
{
"created": "Thu, 23 Mar 2023 15:54:10 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2023 00:09:46 GMT",
"version": "v2"
}
] | 2023-04-20 | [
[
"Heeck",
"Julian",
""
],
[
"Thapa",
"Anil",
""
]
] | The Zee model provides a simple model for one-loop Majorana neutrino masses. The new scalars can furthermore explain the long-standing deviation in the muon's magnetic moment and the recent CDF measurement of the $W$-boson mass. Together, these observations yield predictions for lepton flavor violating processes that are almost entirely testable in the near future. The remaining parameter space makes testable predictions for neutrino masses. |
2310.18398 | Saarik Kalia | Gerard Higgins, Saarik Kalia, Zhen Liu | Maglev for Dark Matter: Dark-photon and axion dark matter sensing with
levitated superconductors | 24 pages, 7 figures. Published version | Phys. Rev. D 109, 055024 (2024) | 10.1103/PhysRevD.109.055024 | null | hep-ph hep-ex quant-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Ultraprecise mechanical sensors offer an exciting avenue for testing new
physics. While many of these sensors are tailored to detect inertial forces,
magnetically levitated (Maglev) systems are particularly interesting, in that
they are also sensitive to electromagnetic forces. In this work, we propose the
use of magnetically levitated superconductors to detect dark-photon and axion
dark matter through their couplings to electromagnetism. Several existing
laboratory experiments search for these dark-matter candidates at high
frequencies, but few are sensitive to frequencies below $\mathrm{1\,kHz}$
(corresponding to dark-matter masses
$m_\mathrm{DM}\lesssim10^{-12}\,\mathrm{eV}$). As a mechanical resonator,
magnetically levitated superconductors are sensitive to lower frequencies, and
so can probe parameter space currently unexplored by laboratory experiments.
Dark-photon and axion dark matter can source an oscillating magnetic field that
drives the motion of a magnetically levitated superconductor. This motion is
resonantly enhanced when the dark matter Compton frequency matches the
levitated superconductor's trapping frequency. We outline the necessary
modifications to make magnetically levitated superconductors sensitive to dark
matter, including specifications for both broadband and resonant schemes. We
show that in the $\mathrm{Hz}\lesssim f_\mathrm{DM}\lesssim\mathrm{kHz}$
frequency range our technique can achieve the leading sensitivity amongst
laboratory probes of both dark-photon and axion dark matter.
| [
{
"created": "Fri, 27 Oct 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2024 17:15:25 GMT",
"version": "v2"
}
] | 2024-03-18 | [
[
"Higgins",
"Gerard",
""
],
[
"Kalia",
"Saarik",
""
],
[
"Liu",
"Zhen",
""
]
] | Ultraprecise mechanical sensors offer an exciting avenue for testing new physics. While many of these sensors are tailored to detect inertial forces, magnetically levitated (Maglev) systems are particularly interesting, in that they are also sensitive to electromagnetic forces. In this work, we propose the use of magnetically levitated superconductors to detect dark-photon and axion dark matter through their couplings to electromagnetism. Several existing laboratory experiments search for these dark-matter candidates at high frequencies, but few are sensitive to frequencies below $\mathrm{1\,kHz}$ (corresponding to dark-matter masses $m_\mathrm{DM}\lesssim10^{-12}\,\mathrm{eV}$). As a mechanical resonator, magnetically levitated superconductors are sensitive to lower frequencies, and so can probe parameter space currently unexplored by laboratory experiments. Dark-photon and axion dark matter can source an oscillating magnetic field that drives the motion of a magnetically levitated superconductor. This motion is resonantly enhanced when the dark matter Compton frequency matches the levitated superconductor's trapping frequency. We outline the necessary modifications to make magnetically levitated superconductors sensitive to dark matter, including specifications for both broadband and resonant schemes. We show that in the $\mathrm{Hz}\lesssim f_\mathrm{DM}\lesssim\mathrm{kHz}$ frequency range our technique can achieve the leading sensitivity amongst laboratory probes of both dark-photon and axion dark matter. |
2210.02979 | Wen-long Sang | Wen-Long Sang (SWU, Chongqing), Hong-Fei Zhang (GUFE, Guiyang),
Ming-Zhen Zhou (SWU, Chongqing) | Decay constant of $B_c^*$ accurate up to $\mathcal{O}(\alpha_s^3)$ | 15 pages, 3 figures, 2 tables, a minor typo corrected | Phys.Lett.B 839 (2023) 137812 | 10.1016/j.physletb.2023.137812 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we evaluate, up to QCD next-to-next-to-next-to-leading order,
the $B_c^*$ decay constant, which, within the nonrelativistic QCD (NRQCD)
framework, is factorized as the product of the short-distance coefficient (SDC)
and the long-distance matrix element. For the first time, the renormalization
constant and the anomalous dimension for the NRQCD vector current composed of
$c\bar{b}$, which are functions of the charm quark mass $m_c$, the bottom quark
mass $m_b$ and the factorization scale $\mu_\Lambda$, are obtained analytically
at $\mathcal{O}(\alpha_s^2)$ and $\mathcal{O}(\alpha_s^3)$. The SDC is
calculated up to $\mathcal{O}(\alpha_s^3)$ in perturbative expansion.
Explicitly, the $\mathcal{O}(\alpha_s^2)$ correction to the SDC is analytically
calculated in terms of logarithmic and polylogarithmic functions of $r\equiv
m_b/m_c$, and the $\mathcal{O}(\alpha_s^3)$ correction to the SDC is
numerically calculated at a series of values of $r$, ranging from $2.1$ to
$4.0$. Surprisingly, we find that the nontrivial part of the SDC at
$\mathcal{O}(\alpha_s^3)$ can be well estimated by a linear function of $r$. In
addition, We find that the $\mathcal{O}(\alpha_s^2)$ and
$\mathcal{O}(\alpha_s^3)$ corrections to the decay constant and decay width are
considerable and very significant, which indicates a very poor convergence for
the perturbative expansion.
| [
{
"created": "Thu, 6 Oct 2022 15:07:39 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2023 01:23:41 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Mar 2023 01:31:53 GMT",
"version": "v3"
}
] | 2023-03-16 | [
[
"Sang",
"Wen-Long",
"",
"SWU, Chongqing"
],
[
"Zhang",
"Hong-Fei",
"",
"GUFE, Guiyang"
],
[
"Zhou",
"Ming-Zhen",
"",
"SWU, Chongqing"
]
] | In this paper, we evaluate, up to QCD next-to-next-to-next-to-leading order, the $B_c^*$ decay constant, which, within the nonrelativistic QCD (NRQCD) framework, is factorized as the product of the short-distance coefficient (SDC) and the long-distance matrix element. For the first time, the renormalization constant and the anomalous dimension for the NRQCD vector current composed of $c\bar{b}$, which are functions of the charm quark mass $m_c$, the bottom quark mass $m_b$ and the factorization scale $\mu_\Lambda$, are obtained analytically at $\mathcal{O}(\alpha_s^2)$ and $\mathcal{O}(\alpha_s^3)$. The SDC is calculated up to $\mathcal{O}(\alpha_s^3)$ in perturbative expansion. Explicitly, the $\mathcal{O}(\alpha_s^2)$ correction to the SDC is analytically calculated in terms of logarithmic and polylogarithmic functions of $r\equiv m_b/m_c$, and the $\mathcal{O}(\alpha_s^3)$ correction to the SDC is numerically calculated at a series of values of $r$, ranging from $2.1$ to $4.0$. Surprisingly, we find that the nontrivial part of the SDC at $\mathcal{O}(\alpha_s^3)$ can be well estimated by a linear function of $r$. In addition, We find that the $\mathcal{O}(\alpha_s^2)$ and $\mathcal{O}(\alpha_s^3)$ corrections to the decay constant and decay width are considerable and very significant, which indicates a very poor convergence for the perturbative expansion. |
1408.4659 | Hannu Paukkunen | David d'Enterria, Kari J. Eskola, Ilkka Helenius, Hannu Paukkunen | LHC data challenges the contemporary parton-to-hadron fragmentation
functions | Transcription of the talk given in DIS2014 conference | null | null | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the inclusive high-pT charged-particle production in proton-proton
collisions at the LHC. The experimental data are compared to the NLO
perturbative QCD calculations employing various sets of parton-to-hadron
fragmentation functions. Most of the theoretical predictions are found to
disastrously overpredict the measured cross sections, even if the scale
variations and PDF errors are accounted for. The problem appears to arise from
the presently too hard gluon-to-hadron fragmentation functions.
| [
{
"created": "Wed, 20 Aug 2014 13:57:27 GMT",
"version": "v1"
}
] | 2014-08-21 | [
[
"d'Enterria",
"David",
""
],
[
"Eskola",
"Kari J.",
""
],
[
"Helenius",
"Ilkka",
""
],
[
"Paukkunen",
"Hannu",
""
]
] | We discuss the inclusive high-pT charged-particle production in proton-proton collisions at the LHC. The experimental data are compared to the NLO perturbative QCD calculations employing various sets of parton-to-hadron fragmentation functions. Most of the theoretical predictions are found to disastrously overpredict the measured cross sections, even if the scale variations and PDF errors are accounted for. The problem appears to arise from the presently too hard gluon-to-hadron fragmentation functions. |
2007.07705 | Mayank Singh | Manu Kurian, Mayank Singh, Vinod Chandra, Sangyong Jeon, Charles Gale | A study of charm quark dynamics in quark-gluon plasma with 3+1 D viscous
hydrodynamics | 11 pages | Phys. Rev. C 102, 044907 (2020) | 10.1103/PhysRevC.102.044907 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The drag and diffusion coefficients are studied within the framework of
Fokker-Planck dynamics for the case of a charm quark propagating in an
expanding quark-gluon plasma. The space-time evolution of the nuclear matter
created in the relativistic heavy-ion collision is modelled using MUSIC, a 3+1
D relativistic viscous hydrodynamic approach. The effect of viscous corrections
to the heavy quark transport coefficients is explored by considering scattering
processes with thermal quarks and gluons in the medium. It is observed that the
momentum diffusion of the heavy quarks is sensitive to the shear and bulk
viscosity to entropy ratios. The collisional energy loss of the charm quark in
the viscous quark-gluon plasma is analyzed.
| [
{
"created": "Wed, 15 Jul 2020 14:22:22 GMT",
"version": "v1"
}
] | 2020-10-23 | [
[
"Kurian",
"Manu",
""
],
[
"Singh",
"Mayank",
""
],
[
"Chandra",
"Vinod",
""
],
[
"Jeon",
"Sangyong",
""
],
[
"Gale",
"Charles",
""
]
] | The drag and diffusion coefficients are studied within the framework of Fokker-Planck dynamics for the case of a charm quark propagating in an expanding quark-gluon plasma. The space-time evolution of the nuclear matter created in the relativistic heavy-ion collision is modelled using MUSIC, a 3+1 D relativistic viscous hydrodynamic approach. The effect of viscous corrections to the heavy quark transport coefficients is explored by considering scattering processes with thermal quarks and gluons in the medium. It is observed that the momentum diffusion of the heavy quarks is sensitive to the shear and bulk viscosity to entropy ratios. The collisional energy loss of the charm quark in the viscous quark-gluon plasma is analyzed. |
1111.3072 | Ahmed Rashed Mr | Ahmed Rashed | Deviation from Tri-Bimaximal Mixing and Large Reactor Mixing Angle | 25 pages, 12 figures. arXiv admin note: text overlap with
arXiv:1109.2320 | Nucl.Phys. B 874 (2013) 679-697 | 10.1016/j.nuclphysb.2013.05.022 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observations for a non-zero $\theta_{13}$ have come from various
experiments. We study a model of lepton mixing with a 2-3 flavor symmetry to
accommodate the sizable $\theta_{13}$ measurement. In this work, we derive
deviations from the tri-bimaximal (TBM) pattern arising from breaking the
flavor symmetry in the neutrino sector, while the charged leptons contribution
has been discussed in a previous work. Contributions from both sectors towards
accommodating the non-zero $\theta_{13}$ measurement are presented.
| [
{
"created": "Sun, 13 Nov 2011 22:46:56 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2013 17:54:52 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Rashed",
"Ahmed",
""
]
] | Recent observations for a non-zero $\theta_{13}$ have come from various experiments. We study a model of lepton mixing with a 2-3 flavor symmetry to accommodate the sizable $\theta_{13}$ measurement. In this work, we derive deviations from the tri-bimaximal (TBM) pattern arising from breaking the flavor symmetry in the neutrino sector, while the charged leptons contribution has been discussed in a previous work. Contributions from both sectors towards accommodating the non-zero $\theta_{13}$ measurement are presented. |
hep-ph/0207266 | Wojciech Broniowski | Enrique Ruiz Arriola (U. Granada) and Wojciech Broniowski (INP,
Cracow) | Pion light-cone wave function and pion distribution amplitude in the
Nambu-Jona-Lasinio model | mistake in Eq.(38) corrected | Phys.Rev. D66 (2002) 094016 | 10.1103/PhysRevD.66.094016 | null | hep-ph | null | We compute the pion light-cone wave function and the pion quark distribution
amplitude in the Nambu-Jona-Lasinio model. We use the Pauli-Villars
regularization method and as a result the distribution amplitude satisfies
proper normalization and crossing properties. In the chiral limit we obtain the
simple results, namely phi_pi(x)=1 for the pion distribution amplitude, and
<k_perp^2> = -M <ubar u> / f_pi^2 for the second moment of the pion light-cone
wave function, where M is the constituent quark mass and f_pi is the pion decay
constant. After the QCD Gegenbauer evolution of the pion distribution amplitude
good end-point behavior is recovered, and a satisfactory agreement with the
analysis of the experimental data from CLEO is achieved. This allows us to
determine the momentum scale corresponding to our model calculation, which is
close to the value Q_0 = 313 MeV obtained earlier from the analogous analysis
of the pion parton distribution function. The value of <k_perp^2> is, after the
QCD evolution, around (400 MeV)^2. In addition, the model predicts a linear
integral relation between the pion distribution amplitude and the parton
distribution function of the pion, which holds at the leading-order QCD
evolution.
| [
{
"created": "Mon, 22 Jul 2002 15:12:51 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2002 09:49:41 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Sep 2002 09:38:50 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Arriola",
"Enrique Ruiz",
"",
"U. Granada"
],
[
"Broniowski",
"Wojciech",
"",
"INP,\n Cracow"
]
] | We compute the pion light-cone wave function and the pion quark distribution amplitude in the Nambu-Jona-Lasinio model. We use the Pauli-Villars regularization method and as a result the distribution amplitude satisfies proper normalization and crossing properties. In the chiral limit we obtain the simple results, namely phi_pi(x)=1 for the pion distribution amplitude, and <k_perp^2> = -M <ubar u> / f_pi^2 for the second moment of the pion light-cone wave function, where M is the constituent quark mass and f_pi is the pion decay constant. After the QCD Gegenbauer evolution of the pion distribution amplitude good end-point behavior is recovered, and a satisfactory agreement with the analysis of the experimental data from CLEO is achieved. This allows us to determine the momentum scale corresponding to our model calculation, which is close to the value Q_0 = 313 MeV obtained earlier from the analogous analysis of the pion parton distribution function. The value of <k_perp^2> is, after the QCD evolution, around (400 MeV)^2. In addition, the model predicts a linear integral relation between the pion distribution amplitude and the parton distribution function of the pion, which holds at the leading-order QCD evolution. |
1805.09787 | Kei Suzuki | Sachio Iwasaki, Kei Suzuki | Quarkonium radiative decays from the hadronic Paschen-Back effect | 11 pages, 1 figure, 5 tables; published version | Phys. Rev. D 98, 054017 (2018) | 10.1103/PhysRevD.98.054017 | KEK-TH-2056 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the radiative (E1 and M1) decays of P-wave quarkonia in a strong
magnetic field based on the Lagrangian of potential nonrelativistic QCD. To
investigate their properties, we implement a polarized wave function basis
justified in the Paschen-Back limit. In a magnetic field stronger than the
spin-orbit coupling, the wave functions of the P-wave quarkonia are drastically
deformed by the Hadronic Paschen-Back effect. Such deformation leads to the
anisotropy of the direction of decays from the P-wave quarkonia. The analytic
formulas for the radiative decay widths in the nonrelativistic limit are shown,
and the qualitative decay properties are discussed.
| [
{
"created": "Thu, 24 May 2018 17:12:35 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2018 15:56:23 GMT",
"version": "v2"
}
] | 2018-09-28 | [
[
"Iwasaki",
"Sachio",
""
],
[
"Suzuki",
"Kei",
""
]
] | We study the radiative (E1 and M1) decays of P-wave quarkonia in a strong magnetic field based on the Lagrangian of potential nonrelativistic QCD. To investigate their properties, we implement a polarized wave function basis justified in the Paschen-Back limit. In a magnetic field stronger than the spin-orbit coupling, the wave functions of the P-wave quarkonia are drastically deformed by the Hadronic Paschen-Back effect. Such deformation leads to the anisotropy of the direction of decays from the P-wave quarkonia. The analytic formulas for the radiative decay widths in the nonrelativistic limit are shown, and the qualitative decay properties are discussed. |
0805.3404 | De-Min Li | De-Min Li and Shan Zhou | Towards the assignment for the $4 ^1S_0$ meson nonet | 15 pages, 5 figures, version accepted for publication in Physical
Review D | Phys.Rev.D78:054013,2008 | 10.1103/PhysRevD.78.054013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong decays of the $\pi(2070)$, $\eta(2010)$, $\eta(2100)$,
$\eta(2190)$, and $\eta(2225)$ as the $4 ^1S_0$ quark-antiquark states are
investigated in the framework of the $^3P_0$ meson decay model. It is found
that the $\pi(2070)$, $\eta(2100)$, and $\eta(2225)$ appear to be the
convincing $4 ^1S_0$ $q\bar{q}$ states while the assignment of the $\eta(2010)$
and $\eta(2190)$ as the $4 ^1S_0$ isoscalar states is not favored by their
widths. In the presence of the $\pi(2070)$, $\eta(2100)$, and $\eta(2225)$
being the members of the $4 ^1S_0$ meson nonet, the $4 ^1S_0$ kaon is
phenomenologically determined to has a mass of about 2153 MeV. The width of
this unobserved kaon is expected to be about 197 MeV in the $^3P_0$ decay
model.
| [
{
"created": "Thu, 22 May 2008 08:17:02 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2008 01:11:55 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Li",
"De-Min",
""
],
[
"Zhou",
"Shan",
""
]
] | The strong decays of the $\pi(2070)$, $\eta(2010)$, $\eta(2100)$, $\eta(2190)$, and $\eta(2225)$ as the $4 ^1S_0$ quark-antiquark states are investigated in the framework of the $^3P_0$ meson decay model. It is found that the $\pi(2070)$, $\eta(2100)$, and $\eta(2225)$ appear to be the convincing $4 ^1S_0$ $q\bar{q}$ states while the assignment of the $\eta(2010)$ and $\eta(2190)$ as the $4 ^1S_0$ isoscalar states is not favored by their widths. In the presence of the $\pi(2070)$, $\eta(2100)$, and $\eta(2225)$ being the members of the $4 ^1S_0$ meson nonet, the $4 ^1S_0$ kaon is phenomenologically determined to has a mass of about 2153 MeV. The width of this unobserved kaon is expected to be about 197 MeV in the $^3P_0$ decay model. |
hep-ph/0503151 | Guy Raz | Gerhard Buchalla, Gudrun Hiller, Yosef Nir, Guy Raz | The Pattern of CP Asymmetries in $b\to s$ Transitions | 20 pages, 3 figures, 6 tables. v3: Discussion of higher order
corrections extended; Version appearing in JHEP | JHEP 0509:074,2005 | 10.1088/1126-6708/2005/09/074 | null | hep-ph | null | New CP violating physics in $b\to s$ transitions will modify the CP
asymmetries in B decays into final CP eigenstates ($\phi K_S$, $\eta^\prime
K_S$, $\pi^0 K_S$, $\omega K_S$, $\rho^0 K_S$ and $\eta K_S$) from their
Standard Model values. In a model independent analysis, the pattern of
deviations can be used to probe which Wilson coefficients get a significant
contribution from the new physics. We demonstrate this idea using several
well-motivated models of new physics, and apply it to current data.
| [
{
"created": "Wed, 16 Mar 2005 09:38:32 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2005 19:43:13 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Oct 2005 09:24:58 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Buchalla",
"Gerhard",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"Nir",
"Yosef",
""
],
[
"Raz",
"Guy",
""
]
] | New CP violating physics in $b\to s$ transitions will modify the CP asymmetries in B decays into final CP eigenstates ($\phi K_S$, $\eta^\prime K_S$, $\pi^0 K_S$, $\omega K_S$, $\rho^0 K_S$ and $\eta K_S$) from their Standard Model values. In a model independent analysis, the pattern of deviations can be used to probe which Wilson coefficients get a significant contribution from the new physics. We demonstrate this idea using several well-motivated models of new physics, and apply it to current data. |
hep-ph/0407330 | Alakabha Datta | Alakabha Datta | Extracting beta and the new D_{sJ} resonances | 11 pages, no figures, Talk presented at MRST 2004 | Int.J.Mod.Phys. A19 (2004) 5501-5512 | 10.1142/S0217751X0402275X | null | hep-ph | null | The three body decays $B \to D^{(*)} \bar{D}^{(*)} K_s$ may be used to
measure both $\sin{2\beta}$ and $\cos{2\beta}$. Crucial to the $\cos{2\beta}$
measurement is the resonant contribution to the three body decay from p-wave
excited $D_s$ states. If these p-wave states are the newly discovered
$D_s(2317)$ and $D_s(2460)$ then they are below the $D^{(*)} K$ threshold and
hence do not contribute to $B \to D^{(*)} \bar{D}^{(*)} K_s$. The three body
decays can then be used to measure $\sin{2\beta}$ without resonant dilution and
to look for new physics in $ b \to c \bar{c} s $ transition.
| [
{
"created": "Thu, 29 Jul 2004 01:42:47 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Datta",
"Alakabha",
""
]
] | The three body decays $B \to D^{(*)} \bar{D}^{(*)} K_s$ may be used to measure both $\sin{2\beta}$ and $\cos{2\beta}$. Crucial to the $\cos{2\beta}$ measurement is the resonant contribution to the three body decay from p-wave excited $D_s$ states. If these p-wave states are the newly discovered $D_s(2317)$ and $D_s(2460)$ then they are below the $D^{(*)} K$ threshold and hence do not contribute to $B \to D^{(*)} \bar{D}^{(*)} K_s$. The three body decays can then be used to measure $\sin{2\beta}$ without resonant dilution and to look for new physics in $ b \to c \bar{c} s $ transition. |
hep-ph/0405065 | Anita Prapotnik | Svjetlana Fajfer (1 and 2), Tri-Nang Pham (3), Anita Prapotnik (1)
((1) J. Stefan Institute, Slovenia, (2) University of Ljubljana, Slovenia,
(3) Centre National de la Recherche Scientifique, France) | CP violation in the partial width asymmetries for B^- -> pi^+ pi^- K^-
and B^- -> K^+ K^- K^- decays | 14 pages, 4 figures, 6 tables, changed content | Phys.Rev.D70:034033,2004 | 10.1103/PhysRevD.70.034033 | null | hep-ph | null | We investigate a possibility of observing CP asymmetries in the partial
widths for the decays B^- -> pi^+ pi^- K^- and B^- -> K^+ K^- K^- produced by
the interference of the non-resonant decay amplitude with the resonant
amplitudes. The resonant states which subsequently decay into pi^+ pi^- and K^+
K^- or K^- pi^+ are charmonium c(bar) c states with J^P = 0^+, 1^-, 1^+ or the
phi(1020) meson. We find that the largest partial width asymmetry comes from
the chi_c0 resonance, while the resonances K^*_0(1430) and psi(2S) give a
partial width asymmetry of the order 10%.
| [
{
"created": "Fri, 7 May 2004 13:39:12 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2004 10:34:11 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Fajfer",
"Svjetlana",
"",
"1 and 2"
],
[
"Pham",
"Tri-Nang",
""
],
[
"Prapotnik",
"Anita",
""
]
] | We investigate a possibility of observing CP asymmetries in the partial widths for the decays B^- -> pi^+ pi^- K^- and B^- -> K^+ K^- K^- produced by the interference of the non-resonant decay amplitude with the resonant amplitudes. The resonant states which subsequently decay into pi^+ pi^- and K^+ K^- or K^- pi^+ are charmonium c(bar) c states with J^P = 0^+, 1^-, 1^+ or the phi(1020) meson. We find that the largest partial width asymmetry comes from the chi_c0 resonance, while the resonances K^*_0(1430) and psi(2S) give a partial width asymmetry of the order 10%. |
hep-ph/9612208 | Warren Perkins | Anne-Christine Davis, Warren B. Perkins | Dissipating Cosmic Vortons and Baryogenesis | 8 pages, TeX | Phys.Lett. B393 (1997) 46-50 | 10.1016/S0370-2693(96)01612-7 | DAMTP 96-73, SWAT/132 | hep-ph | null | Grand unified theories can admit cosmic strings with fermion zero modes which
result in the string carrying a current and the formation of stable remnants,
vortons. We consider theories in which the zero modes do not survive a
subsequent phase transition, for example the electroweak transition, resulting
in vorton dissipation. The dissipating vortons can create a baryon asymmetry.
We calculate the asymmetry produced, and show that it is maximised if the
vortons decay just before they dominate the energy density of the Universe. We
further bound the asymmetry produced by the late decay of any relic particle.
| [
{
"created": "Fri, 29 Nov 1996 15:20:50 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Davis",
"Anne-Christine",
""
],
[
"Perkins",
"Warren B.",
""
]
] | Grand unified theories can admit cosmic strings with fermion zero modes which result in the string carrying a current and the formation of stable remnants, vortons. We consider theories in which the zero modes do not survive a subsequent phase transition, for example the electroweak transition, resulting in vorton dissipation. The dissipating vortons can create a baryon asymmetry. We calculate the asymmetry produced, and show that it is maximised if the vortons decay just before they dominate the energy density of the Universe. We further bound the asymmetry produced by the late decay of any relic particle. |
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