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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2310.18109 | Mario Pitschmann | Hauke Fischer, Christian K\"ading, Hartmut Lemmel, Stephan Sponar, and
Mario Pitschmann | Search for dark energy with neutron interferometry | 11 pages, 8 figures | null | 10.1093/ptep/ptae014 | null | hep-ph astro-ph.CO gr-qc nucl-ex quant-ph | http://creativecommons.org/licenses/by/4.0/ | We use previously obtained experimental results by neutron interferometry to
effectively constrain the parameter space of several prominent dark energy
models. This investigation encompasses the environment-dependent dilaton field,
a compelling contender for dark energy that emerges naturally within the strong
coupling limit of string theory, alongside symmetron and chameleon fields. Our
study presents substantial improvements over previous constraints of the
dilaton and symmetron fields, improving parameter constraints by several orders
of magnitude. However, the analysis does not yield any new constraints on the
chameleon field. Furthermore, we establish constraints for the projected
neutron split interferometer, which has recently concluded a decisive
proof-of-principle demonstration. Our symmetron simulations reveal that
depending on the parameter values there are multiple static solutions with
increasing number of nodes and increasing energy inside a cylindrical vacuum
chamber. This agrees with results obtained earlier in the literature for
infinitely parallel plates. Interestingly, while these multiple solutions can
correspond to domain walls forming inside the vacuum chamber, we also find
solutions that do not reach their vacuum expectation value inside the vacuum
chamber, but display multiple nodes nonetheless.
| [
{
"created": "Fri, 27 Oct 2023 12:49:01 GMT",
"version": "v1"
}
] | 2024-02-23 | [
[
"Fischer",
"Hauke",
""
],
[
"Käding",
"Christian",
""
],
[
"Lemmel",
"Hartmut",
""
],
[
"Sponar",
"Stephan",
""
],
[
"Pitschmann",
"Mario",
""
]
] | We use previously obtained experimental results by neutron interferometry to effectively constrain the parameter space of several prominent dark energy models. This investigation encompasses the environment-dependent dilaton field, a compelling contender for dark energy that emerges naturally within the strong coupling limit of string theory, alongside symmetron and chameleon fields. Our study presents substantial improvements over previous constraints of the dilaton and symmetron fields, improving parameter constraints by several orders of magnitude. However, the analysis does not yield any new constraints on the chameleon field. Furthermore, we establish constraints for the projected neutron split interferometer, which has recently concluded a decisive proof-of-principle demonstration. Our symmetron simulations reveal that depending on the parameter values there are multiple static solutions with increasing number of nodes and increasing energy inside a cylindrical vacuum chamber. This agrees with results obtained earlier in the literature for infinitely parallel plates. Interestingly, while these multiple solutions can correspond to domain walls forming inside the vacuum chamber, we also find solutions that do not reach their vacuum expectation value inside the vacuum chamber, but display multiple nodes nonetheless. |
0809.1006 | Antonino Flachi | Antonino Flachi, Misao Sasaki, Takahiro Tanaka | Spin Polarization Effects in Micro Black Hole Evaporation | 5 pages, 12 figures. Various changes | null | 10.1088/1126-6708/2009/05/031 | YITP-08-71 | hep-ph astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the evaporation of rotating micro black holes produced in highly
energetic particle collisions, taking into account the polarization due to the
coupling between the spin of the emitted particles and the angular momentum of
the black hole. The effect of rotation shows up in the helicity dependent
angular distribution significantly. By using this effect, there is a
possibility to determine the axis of rotation for each black hole formed,
suggesting a way to improve the statistics. Deviation from thermal spectrum is
also a signature of rotation. This deviation is due to the fact that rapidly
rotating holes have an effective temperature $T_{\rm eff}$ significantly higher
than the Hawking temperature $T_H$. The deformation of the spectral shape
becomes evident only for very rapidly rotating cases. We show that, since the
spectrum follows a blackbody profile with an effective temperature, it is
difficult to determine both the number of extra-dimensions and the rotation
parameter from the energy spectrum alone. We argue that the helicity dependent
angular distribution may provide a way to resolve this degeneracy. We
illustrate the above results for the case of fermions.
| [
{
"created": "Fri, 5 Sep 2008 11:14:24 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2009 09:36:07 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Flachi",
"Antonino",
""
],
[
"Sasaki",
"Misao",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We consider the evaporation of rotating micro black holes produced in highly energetic particle collisions, taking into account the polarization due to the coupling between the spin of the emitted particles and the angular momentum of the black hole. The effect of rotation shows up in the helicity dependent angular distribution significantly. By using this effect, there is a possibility to determine the axis of rotation for each black hole formed, suggesting a way to improve the statistics. Deviation from thermal spectrum is also a signature of rotation. This deviation is due to the fact that rapidly rotating holes have an effective temperature $T_{\rm eff}$ significantly higher than the Hawking temperature $T_H$. The deformation of the spectral shape becomes evident only for very rapidly rotating cases. We show that, since the spectrum follows a blackbody profile with an effective temperature, it is difficult to determine both the number of extra-dimensions and the rotation parameter from the energy spectrum alone. We argue that the helicity dependent angular distribution may provide a way to resolve this degeneracy. We illustrate the above results for the case of fermions. |
hep-ph/9501309 | G. T. Gabadadze | G.T. Gabadadze | An Estimate of the Proton Singlet Axial Constant | 10 p., LATEX file. | Proceedings, Int. Seminar "Quarks '94", p.581. World Sc. 1995. | null | Preprint JINR E2-94-518 (1994). | hep-ph | null | The value of the proton singlet axial constant is estimated. It has been
shown that the axial anomaly plays a crucial role in this calculation. Obtained
result is sufficiently suppressed in comparison with the naively expected one.
The magnitude of the strange quark contribution for the proton state is also
computed approximately.
| [
{
"created": "Mon, 16 Jan 1995 15:37:26 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Gabadadze",
"G. T.",
""
]
] | The value of the proton singlet axial constant is estimated. It has been shown that the axial anomaly plays a crucial role in this calculation. Obtained result is sufficiently suppressed in comparison with the naively expected one. The magnitude of the strange quark contribution for the proton state is also computed approximately. |
hep-ph/0110110 | Eugenio Marco Rubio | E. Marco, R. Hofmann and W. Weise | Note on finite temperature sum rules for vector and axial-vector
spectral functions | 10 pages, 2 figures | Phys.Lett. B530 (2002) 88-92 | 10.1016/S0370-2693(02)01343-6 | TUM/T39-01-23; MPI-PHT 2001-38 | hep-ph | null | An updated analysis of vector and axial-vector spectral functions is
presented. The resonant contributions to the spectral integrals are shown to be
expressible as multiples of 4 pi^2 f_pi^2, encoding the scale of spontaneous
chiral symmetry breaking in QCD. Up to order T^2 this behavior carries over to
the case of finite temperature.
| [
{
"created": "Mon, 8 Oct 2001 15:51:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Marco",
"E.",
""
],
[
"Hofmann",
"R.",
""
],
[
"Weise",
"W.",
""
]
] | An updated analysis of vector and axial-vector spectral functions is presented. The resonant contributions to the spectral integrals are shown to be expressible as multiples of 4 pi^2 f_pi^2, encoding the scale of spontaneous chiral symmetry breaking in QCD. Up to order T^2 this behavior carries over to the case of finite temperature. |
1812.01568 | Jos\'e Francisco Zurita | David Curtin, Kaustubh Deshpande, Oliver Fischer, Jose Zurita | Closing the light gluino gap with electron-proton colliders | 7 pages, 5 figures | Phys. Rev. D 99, 055011 (2019) | 10.1103/PhysRevD.99.055011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The future electron-proton collider proposals, LHeC and FCC-he, can deliver
$\mathcal{O}$(TeV) center-of-mass energy collisions, higher than most of the
proposed lepton accelerators, with $\mathcal{O}$(ab$^{-1}$) luminosity, while
maintaining a much cleaner experimental environment as compared to the hadron
machines. This unique capability of $e^- p$ colliders can be harnessed in
probing BSM scenarios giving final states that look like hadronic noise at $pp$
machines. In the present study, we explore the prospects of detecting such a
prompt signal having multiple soft jets at the LHeC. Such a signal can come
from the decay of gluino in RPV or Stealth SUSY, where there exists a gap in
the current experimental search with $m_{\tilde{g}} \approx 50 - 70$ GeV. We
perform a simple analysis to demonstrate that, with simple signal selection
cuts, we can close this gap at the LHeC at 95 % confidence level, even in the
presence of a reasonable systematic error. More sophisticated signal selection
strategies and detailed knowledge of the detector can be used to improve the
prospects of signal detection.
| [
{
"created": "Tue, 4 Dec 2018 18:17:25 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Curtin",
"David",
""
],
[
"Deshpande",
"Kaustubh",
""
],
[
"Fischer",
"Oliver",
""
],
[
"Zurita",
"Jose",
""
]
] | The future electron-proton collider proposals, LHeC and FCC-he, can deliver $\mathcal{O}$(TeV) center-of-mass energy collisions, higher than most of the proposed lepton accelerators, with $\mathcal{O}$(ab$^{-1}$) luminosity, while maintaining a much cleaner experimental environment as compared to the hadron machines. This unique capability of $e^- p$ colliders can be harnessed in probing BSM scenarios giving final states that look like hadronic noise at $pp$ machines. In the present study, we explore the prospects of detecting such a prompt signal having multiple soft jets at the LHeC. Such a signal can come from the decay of gluino in RPV or Stealth SUSY, where there exists a gap in the current experimental search with $m_{\tilde{g}} \approx 50 - 70$ GeV. We perform a simple analysis to demonstrate that, with simple signal selection cuts, we can close this gap at the LHeC at 95 % confidence level, even in the presence of a reasonable systematic error. More sophisticated signal selection strategies and detailed knowledge of the detector can be used to improve the prospects of signal detection. |
1211.6230 | Leonid Slad | L.M. Slad | Magnetic moment operator of non-Dirac particles and some elements of
polarization $ep$-experiments | 10 pages; v2 journal version with a modified introduction | Mod. Phys. Lett. A 28 (2013) 1350051 | 10.1142/S021773231350051X | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An explicit form of the magnetic moment tensor operator for non-Dirac
particles with rest spin 1/2 and its essential difference from the spin
operator are established. Possible consequences of the last fact for the
description of the spin rotation in the magnetic field and for the values of
magnetic moments of some nuclei, as well as the impact of this and other facts
on the validity of modelling the azimuthal asymmetry of the secondary-scattered
protons in $ep$-experiments are noted.
| [
{
"created": "Tue, 27 Nov 2012 08:24:31 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2013 09:59:54 GMT",
"version": "v2"
}
] | 2013-04-12 | [
[
"Slad",
"L. M.",
""
]
] | An explicit form of the magnetic moment tensor operator for non-Dirac particles with rest spin 1/2 and its essential difference from the spin operator are established. Possible consequences of the last fact for the description of the spin rotation in the magnetic field and for the values of magnetic moments of some nuclei, as well as the impact of this and other facts on the validity of modelling the azimuthal asymmetry of the secondary-scattered protons in $ep$-experiments are noted. |
1608.06711 | Mandip Singh | Mandip Singh | Studying the physics potential of long-baseline experiments in terms of
new sensitivity parameters | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate physics opportunities to constraint leptonic CP-violation
phase $\delta_{CP}$ through numerical analysis of working neutrino oscillation
probability parameters, in the context of long base line experiments. Numerical
analysis of two parameters, the " transition probability $\delta_{CP}$ phase
sensitivity parameter ($A^M$) " and " CP-violation probability $\delta_{CP}$
phase sensitivity parameter ($A^{CP}$) ", as function of beam energy and/or
base line has been preferably carried out. It is an elegant technique to
broadly analyze different experiments to constraint $\delta_{CP}$ phase and
also to investigate mass hierarchy in the leptonic sector. The positive and
negative values of parameter $A^{CP}$ corresponding to either of hierarchy in
the specific beam energy ranges, could be a very promising way to explore mass
hierarchy and $\delta_{CP}$ phase. The keys to more robust bounds on
$\delta_{CP}$ phase are improvements of the involved detection techniques to
explore bit low energy and relatively long base line regions with better
experimental accuracy.
| [
{
"created": "Wed, 24 Aug 2016 04:38:55 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Singh",
"Mandip",
""
]
] | We investigate physics opportunities to constraint leptonic CP-violation phase $\delta_{CP}$ through numerical analysis of working neutrino oscillation probability parameters, in the context of long base line experiments. Numerical analysis of two parameters, the " transition probability $\delta_{CP}$ phase sensitivity parameter ($A^M$) " and " CP-violation probability $\delta_{CP}$ phase sensitivity parameter ($A^{CP}$) ", as function of beam energy and/or base line has been preferably carried out. It is an elegant technique to broadly analyze different experiments to constraint $\delta_{CP}$ phase and also to investigate mass hierarchy in the leptonic sector. The positive and negative values of parameter $A^{CP}$ corresponding to either of hierarchy in the specific beam energy ranges, could be a very promising way to explore mass hierarchy and $\delta_{CP}$ phase. The keys to more robust bounds on $\delta_{CP}$ phase are improvements of the involved detection techniques to explore bit low energy and relatively long base line regions with better experimental accuracy. |
hep-ph/0410179 | Ngoc-Khanh Tran | P. Q. Hung, A. Soddu and Ngoc-Khanh Tran | Complete CKM quark mixing via dimensional deconstruction | RevTex4, 25 pages, typos in section IIC corrected, published version | Nucl.Phys. B712 (2005) 325-346 | 10.1016/j.nuclphysb.2005.01.027 | null | hep-ph | null | It is shown that the deconstruction of $[SU(2)\times U(1)]^N$ into
$[SU(2)\times U(1)]$ is capable of providing all necessary ingredients to
completely impliment the complex CKM mixing of quark flavors. The hierarchical
structure of quark masses originates from the difference in the deconstructed
chiral zero-mode distribution in theory space, while the CP-violating phase
comes from the genuinely complex vacuum expectation value of link fields. The
mixing is constructed in a specific model to satisfy experimental bounds on
quarks' masses and CP violation.
| [
{
"created": "Tue, 12 Oct 2004 21:20:16 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jan 2005 22:40:41 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Mar 2005 21:40:47 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Hung",
"P. Q.",
""
],
[
"Soddu",
"A.",
""
],
[
"Tran",
"Ngoc-Khanh",
""
]
] | It is shown that the deconstruction of $[SU(2)\times U(1)]^N$ into $[SU(2)\times U(1)]$ is capable of providing all necessary ingredients to completely impliment the complex CKM mixing of quark flavors. The hierarchical structure of quark masses originates from the difference in the deconstructed chiral zero-mode distribution in theory space, while the CP-violating phase comes from the genuinely complex vacuum expectation value of link fields. The mixing is constructed in a specific model to satisfy experimental bounds on quarks' masses and CP violation. |
2106.05904 | Jose M. Carmona | Jos\'e Manuel Carmona, Jos\'e Luis Cort\'es and Jos\'e Javier Relancio | Particle-antiparticle asymmetry in a relativistic deformed kinematics | 13 pages. Version published in Symmetry (prior to journal proofs);
the article belongs to the Special Issue "Symmetry, CPT and Astroparticles" | Symmetry 13(7), 1266 (2021) | 10.3390/sym13071266 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic deformed kinematics are usually considered as a way to capture
residual effects of a fundamental quantum gravity theory. These kinematics
present a non-commutative addition law for the momenta, so that the total
momentum of a multi-particle system depends on the specific ordering in which
the momenta are composed. We explore in the present work how this property may
be used to generate an asymmetry between particles and antiparticles through a
particular ordering prescription, resulting in a violation of CPT symmetry. We
study its consequences for muon decay, obtaining a difference in the lifetimes
of the particle and the antiparticle as a function the new high-energy scale
parameterizing such a relativistic deformed kinematics.
| [
{
"created": "Thu, 10 Jun 2021 16:45:17 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jul 2021 08:24:43 GMT",
"version": "v2"
}
] | 2021-07-20 | [
[
"Carmona",
"José Manuel",
""
],
[
"Cortés",
"José Luis",
""
],
[
"Relancio",
"José Javier",
""
]
] | Relativistic deformed kinematics are usually considered as a way to capture residual effects of a fundamental quantum gravity theory. These kinematics present a non-commutative addition law for the momenta, so that the total momentum of a multi-particle system depends on the specific ordering in which the momenta are composed. We explore in the present work how this property may be used to generate an asymmetry between particles and antiparticles through a particular ordering prescription, resulting in a violation of CPT symmetry. We study its consequences for muon decay, obtaining a difference in the lifetimes of the particle and the antiparticle as a function the new high-energy scale parameterizing such a relativistic deformed kinematics. |
hep-ph/0611241 | Ulrich Baur | U. Baur (Buffalo) | Weak Boson Emission in Hadron Collider Processes | revtex3, 41 pages, 16 figures, 3 tables | Phys.Rev.D75:013005,2007 | 10.1103/PhysRevD.75.013005 | UB-HET-06-02 | hep-ph | null | The O(alpha) virtual weak radiative corrections to many hadron collider
processes are known to become large and negative at high energies, due to the
appearance of Sudakov-like logarithms. At the same order in perturbation
theory, weak boson emission diagrams contribute. Since the W and Z bosons are
massive, the O(alpha) virtual weak radiative corrections and the contributions
from weak boson emission are separately finite. Thus, unlike in QED or QCD
calculations, there is no technical reason for including gauge boson emission
diagrams in calculations of electroweak radiative corrections. In most
calculations of the O(alpha) electroweak radiative corrections, weak boson
emission diagrams are therefore not taken into account. Another reason for not
including these diagrams is that they lead to final states which differ from
that of the original process. However, in experiment, one usually considers
partially inclusive final states. Weak boson emission diagrams thus should be
included in calculations of electroweak radiative corrections. In this paper, I
examine the role of weak boson emission in those processes at the Fermilab
Tevatron and the CERN LHC for which the one-loop electroweak radiative
corrections are known to become large at high energies (inclusive jet, isolated
photon, Z+1 jet, Drell-Yan, di-boson, t-bar t, and single top production). In
general, I find that the cross section for weak boson emission is substantial
at high energies and that weak boson emission and the O(alpha) virtual weak
radiative corrections partially cancel.
| [
{
"created": "Fri, 17 Nov 2006 22:34:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Baur",
"U.",
"",
"Buffalo"
]
] | The O(alpha) virtual weak radiative corrections to many hadron collider processes are known to become large and negative at high energies, due to the appearance of Sudakov-like logarithms. At the same order in perturbation theory, weak boson emission diagrams contribute. Since the W and Z bosons are massive, the O(alpha) virtual weak radiative corrections and the contributions from weak boson emission are separately finite. Thus, unlike in QED or QCD calculations, there is no technical reason for including gauge boson emission diagrams in calculations of electroweak radiative corrections. In most calculations of the O(alpha) electroweak radiative corrections, weak boson emission diagrams are therefore not taken into account. Another reason for not including these diagrams is that they lead to final states which differ from that of the original process. However, in experiment, one usually considers partially inclusive final states. Weak boson emission diagrams thus should be included in calculations of electroweak radiative corrections. In this paper, I examine the role of weak boson emission in those processes at the Fermilab Tevatron and the CERN LHC for which the one-loop electroweak radiative corrections are known to become large at high energies (inclusive jet, isolated photon, Z+1 jet, Drell-Yan, di-boson, t-bar t, and single top production). In general, I find that the cross section for weak boson emission is substantial at high energies and that weak boson emission and the O(alpha) virtual weak radiative corrections partially cancel. |
hep-ph/0202056 | Martin Beneke | M. Beneke (RWTH Aachen) | Exclusive non-leptonic B meson decays from QCD | 7 pages, LaTeX, Talk presented at the 5th KEK Topical Conference --
Frontiers in Flavour Physics, Tsukuba, Japan, November 2001 | Nucl.Phys.Proc.Suppl.111:62-68,2002 | 10.1016/S0920-5632(02)01685-7 | PITHA 02/06 | hep-ph | null | A brief report on the QCD factorization approach to exclusive B decays and
its applications is presented. In an appendix a subtle issue concerning partial
integration in the parameterization of infrared-sensitive power corrections is
clarified.
| [
{
"created": "Wed, 6 Feb 2002 19:59:00 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Beneke",
"M.",
"",
"RWTH Aachen"
]
] | A brief report on the QCD factorization approach to exclusive B decays and its applications is presented. In an appendix a subtle issue concerning partial integration in the parameterization of infrared-sensitive power corrections is clarified. |
1706.02647 | Johannes Knaute | J. Knaute, B. K\"ampfer | Holographic Entanglement Entropy in the QCD Phase Diagram with a
Critical Point | updated to consistent scaling in arXiv:1702.06731v2; extended
discussions and refs added; to appear in PRD | Phys. Rev. D 96, 106003 (2017) | 10.1103/PhysRevD.96.106003 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the holographic entanglement entropy for the holographic QCD
phase diagram considered in [Knaute, Yaresko, K\"ampfer (2017),
arXiv:1702.06731] and explore the resulting qualitative behavior over the
temperature-chemical potential plane. In agreement with the thermodynamic
result, the phase diagram exhibits the same critical point as the onset of a
first-order phase transition curve. We compare the phase diagram of the
entanglement entropy to that of the thermodynamic entropy density and find a
striking agreement in the vicinity of the critical point. Thus, the holographic
entanglement entropy qualifies to characterize different phase structures. The
scaling behavior near the critical point is analyzed through the calculation of
critical exponents.
| [
{
"created": "Thu, 8 Jun 2017 15:40:01 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Oct 2017 13:56:05 GMT",
"version": "v2"
}
] | 2017-11-08 | [
[
"Knaute",
"J.",
""
],
[
"Kämpfer",
"B.",
""
]
] | We calculate the holographic entanglement entropy for the holographic QCD phase diagram considered in [Knaute, Yaresko, K\"ampfer (2017), arXiv:1702.06731] and explore the resulting qualitative behavior over the temperature-chemical potential plane. In agreement with the thermodynamic result, the phase diagram exhibits the same critical point as the onset of a first-order phase transition curve. We compare the phase diagram of the entanglement entropy to that of the thermodynamic entropy density and find a striking agreement in the vicinity of the critical point. Thus, the holographic entanglement entropy qualifies to characterize different phase structures. The scaling behavior near the critical point is analyzed through the calculation of critical exponents. |
hep-ph/0401031 | Miguel Sanchis | Miguel-Angel Sanchis-Lozano | Searching for new physics in Upsilon decays | 6 pages, 2 eps figures | null | null | IFIC/04-1, FTUV-04-0107 | hep-ph | null | We study some possible experimental consequences of new physics on the
spectrum and decays of bottomonium states below $B\bar{B}$ threshold. In
addition to lepton universality breaking in Upsilon decays, large widths of
pseudoscalar $\eta_b$ resonances and mixing with a non-standard CP-odd light
Higgs boson might smooth and shift the signal peak from hindered radiative M1
transitions between $\Upsilon$ and $\eta_b$ states in the photon energy
spectrum, as searched by CLEO. We also stress the relevance of forthcoming
results from CLEO on leptonic branching fractions of $\Upsilon$ resonances to
definitely check our hypothesis.
| [
{
"created": "Wed, 7 Jan 2004 18:27:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sanchis-Lozano",
"Miguel-Angel",
""
]
] | We study some possible experimental consequences of new physics on the spectrum and decays of bottomonium states below $B\bar{B}$ threshold. In addition to lepton universality breaking in Upsilon decays, large widths of pseudoscalar $\eta_b$ resonances and mixing with a non-standard CP-odd light Higgs boson might smooth and shift the signal peak from hindered radiative M1 transitions between $\Upsilon$ and $\eta_b$ states in the photon energy spectrum, as searched by CLEO. We also stress the relevance of forthcoming results from CLEO on leptonic branching fractions of $\Upsilon$ resonances to definitely check our hypothesis. |
hep-ph/9805397 | Marek Olechowski | Y. Kawamura, H.P. Nilles, M. Olechowski and M. Yamaguchi | Relic Abundance of Neutralinos in Heterotic String Theory: Weak Coupling
vs. Strong Coupling | 24 pages, latex, no figures | JHEP 9806:008,1998 | 10.1088/1126-6708/1998/06/008 | BONN-TH-98-11, SFB-375/297, TUM-TH-314/98, TU-547, RCNS-98-07 | hep-ph hep-th | null | The relic abundance of stable neutralinos is investigated in $E_8 \times
E_8'$ heterotic string theory when supersymmetry is spontaneously broken by
hidden-sector gaugino condensates. In the weak coupling regime, very large
scalar masses (compared to gaugino masses) are shown to lead to a too large
relic abundance of the neutralinos, incompatible with cosmological observations
in most of parameter space. The problem does not arise in the strong coupling
regime (heterotic M-theory) because there scalar and gaugino masses are
generically of the same order of magnitude.
| [
{
"created": "Wed, 20 May 1998 14:44:41 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Kawamura",
"Y.",
""
],
[
"Nilles",
"H. P.",
""
],
[
"Olechowski",
"M.",
""
],
[
"Yamaguchi",
"M.",
""
]
] | The relic abundance of stable neutralinos is investigated in $E_8 \times E_8'$ heterotic string theory when supersymmetry is spontaneously broken by hidden-sector gaugino condensates. In the weak coupling regime, very large scalar masses (compared to gaugino masses) are shown to lead to a too large relic abundance of the neutralinos, incompatible with cosmological observations in most of parameter space. The problem does not arise in the strong coupling regime (heterotic M-theory) because there scalar and gaugino masses are generically of the same order of magnitude. |
hep-ph/0205051 | Guenter Sigl | Guenter Sigl (GReCO, Institut d'Astrophysique de Paris, CNRS) | Probing Physics at Extreme Energies with Cosmic Ultra-High Energy
Radiation | 12 latex pages, 2 postscript figures included; based on invited talk
at the WHEPP-7 Conference, Allahabad, India (January, 2002) | Annals Phys.301:53-64,2002; Pramana 60:279-290,2003 | 10.1006/aphy.2002.6295 | null | hep-ph astro-ph | null | The highest energy cosmic rays observed possess macroscopic energies and
their origin is likely to be associated with the most energetic processes in
the Universe. Their existence triggered a flurry of theoretical explanations
ranging from conventional shock acceleration to particle physics beyond the
Standard Model and processes taking place at the earliest moments of our
Universe. Furthermore, many new experimental activities promise a strong
increase of statistics at the highest energies and a combination with gamma-ray
and neutrino astrophysics will put strong constraints on these theoretical
models. We give an overview over this quickly evolving research field with
focus on testing new particle physics.
| [
{
"created": "Mon, 6 May 2002 16:37:30 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Sigl",
"Guenter",
"",
"GReCO, Institut d'Astrophysique de Paris, CNRS"
]
] | The highest energy cosmic rays observed possess macroscopic energies and their origin is likely to be associated with the most energetic processes in the Universe. Their existence triggered a flurry of theoretical explanations ranging from conventional shock acceleration to particle physics beyond the Standard Model and processes taking place at the earliest moments of our Universe. Furthermore, many new experimental activities promise a strong increase of statistics at the highest energies and a combination with gamma-ray and neutrino astrophysics will put strong constraints on these theoretical models. We give an overview over this quickly evolving research field with focus on testing new particle physics. |
1512.06877 | Jiayin Gu | Nathaniel Craig, Jiayin Gu, Zhen Liu, Kechen Wang | Beyond Higgs Couplings: Probing the Higgs with Angular Observables at
Future $e^+ e^-$ Colliders | 28 pages, 9 figures. v2: references added, matches published version
in JHEP | JHEP 1603 (2016) 050 | 10.1007/JHEP03(2016)050 | FERMILAB-PUB-15-569-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study angular observables in the $e^+e^-\to Z H\to \ell^+
\ell^-\,b\bar{b}$ channel at future circular $e^+ e^-$ colliders such as CEPC
and FCC-ee. Taking into account the impact of realistic cut acceptance and
detector effects, we forecast the precision of six angular asymmetries at CEPC
(FCC-ee) with center-of-mass energy $\sqrt{s} =$ 240 GeV and 5 (30) ${\rm
ab}^{-1}$ integrated luminosity. We then determine the projected sensitivity to
a range of operators relevant for the Higgs-strahlung process in the
dimension-6 Higgs EFT. Our results show that angular observables provide
complementary sensitivity to rate measurements when constraining various tensor
structures arising from new physics. We further find that angular asymmetries
provide a novel means of both probing BSM corrections to the $H Z \gamma$
coupling and constraining the "blind spot" in indirect limits on supersymmetric
scalar top partners.
| [
{
"created": "Mon, 21 Dec 2015 21:22:28 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2016 15:30:18 GMT",
"version": "v2"
}
] | 2016-03-17 | [
[
"Craig",
"Nathaniel",
""
],
[
"Gu",
"Jiayin",
""
],
[
"Liu",
"Zhen",
""
],
[
"Wang",
"Kechen",
""
]
] | We study angular observables in the $e^+e^-\to Z H\to \ell^+ \ell^-\,b\bar{b}$ channel at future circular $e^+ e^-$ colliders such as CEPC and FCC-ee. Taking into account the impact of realistic cut acceptance and detector effects, we forecast the precision of six angular asymmetries at CEPC (FCC-ee) with center-of-mass energy $\sqrt{s} =$ 240 GeV and 5 (30) ${\rm ab}^{-1}$ integrated luminosity. We then determine the projected sensitivity to a range of operators relevant for the Higgs-strahlung process in the dimension-6 Higgs EFT. Our results show that angular observables provide complementary sensitivity to rate measurements when constraining various tensor structures arising from new physics. We further find that angular asymmetries provide a novel means of both probing BSM corrections to the $H Z \gamma$ coupling and constraining the "blind spot" in indirect limits on supersymmetric scalar top partners. |
hep-ph/0207116 | Lev Leinson | L.B. Leinson | Direct Urca processes on nucleons in cooling neutron stars | 21 pages, 2 figures | Nucl.Phys. A707 (2002) 543-560 | 10.1016/S0375-9474(02)00991-0 | null | hep-ph astro-ph nucl-th | null | We use the field theoretical model to perform relativistic calculations of
neutrino energy losses caused by the direct Urca processes on nucleons in the
degenerate baryon matter. By our analysis, the direct neutron decay in the
superdense nuclear matter under beta equilibrium is open only due to the
isovector meson fields, which create a large energy gap between protons and
neutrons in the medium. Our expression for the neutrino energy losses, obtained
in the mean field approximation, incorporates the effects of nucleon recoil,
parity violation, weak magnetism, and pseudoscalar interaction. For numerical
testing of our formula, we use a self-consistent relativistic model of the
multicomponent baryon matter. The relativistic emissivity of the direct Urca
reactions is found substantially larger than predicted in the non-relativistic
approach. We found that, due to weak magnetism effects, relativistic
emissivities increase by approximately 40-50%, while the pseudoscalar
interaction only slightly suppresses the energy losses, approximately by 5%.
| [
{
"created": "Tue, 9 Jul 2002 10:03:08 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2002 16:59:55 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Leinson",
"L. B.",
""
]
] | We use the field theoretical model to perform relativistic calculations of neutrino energy losses caused by the direct Urca processes on nucleons in the degenerate baryon matter. By our analysis, the direct neutron decay in the superdense nuclear matter under beta equilibrium is open only due to the isovector meson fields, which create a large energy gap between protons and neutrons in the medium. Our expression for the neutrino energy losses, obtained in the mean field approximation, incorporates the effects of nucleon recoil, parity violation, weak magnetism, and pseudoscalar interaction. For numerical testing of our formula, we use a self-consistent relativistic model of the multicomponent baryon matter. The relativistic emissivity of the direct Urca reactions is found substantially larger than predicted in the non-relativistic approach. We found that, due to weak magnetism effects, relativistic emissivities increase by approximately 40-50%, while the pseudoscalar interaction only slightly suppresses the energy losses, approximately by 5%. |
hep-ph/9309217 | Vladimir Braun | I.I. Balitsky, M. Beneke and V.M. Braun | Instanton contributions to the $\tau$ decay widths | LATEX, 13 pages, 3 figures available upon request, MPI-Ph/93-62 | Phys.Lett. B318 (1993) 371-381 | 10.1016/0370-2693(93)90142-5 | null | hep-ph | null | Contrary to some previous claims, we find a sizable instanton contribution to
the finite energy sum rule used to extract the value of the strong coupling
from the measured $\tau$ decay widths. It is of the same order of magnitude as
standard nonperturbative corrections induced by vacuum quark and gluon
condensates. Our result indicates that there might be no hierarchy of power
corrections in finite energy sum rules at the scale of $\tau$ mass. Therefore,
the standard nonperturbative corrections do not necessarily improve the
accuracy of the theoretical predicition, but can rather be used to estimate an
intrinsic accuracy of the pure perturbative calculation, which turns out to be
rather high on this evidence, of order one percent.
| [
{
"created": "Fri, 3 Sep 1993 11:46:18 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Balitsky",
"I. I.",
""
],
[
"Beneke",
"M.",
""
],
[
"Braun",
"V. M.",
""
]
] | Contrary to some previous claims, we find a sizable instanton contribution to the finite energy sum rule used to extract the value of the strong coupling from the measured $\tau$ decay widths. It is of the same order of magnitude as standard nonperturbative corrections induced by vacuum quark and gluon condensates. Our result indicates that there might be no hierarchy of power corrections in finite energy sum rules at the scale of $\tau$ mass. Therefore, the standard nonperturbative corrections do not necessarily improve the accuracy of the theoretical predicition, but can rather be used to estimate an intrinsic accuracy of the pure perturbative calculation, which turns out to be rather high on this evidence, of order one percent. |
1312.5664 | David Marzocca | David Marzocca, Alberto Parolini, Marco Serone | Supersymmetry with a pNGB Higgs and Partial Compositeness | 26 pages, 3 figures. Version to appear in JHEP | JHEP 1403 (2014) 099 | 10.1007/JHEP03(2014)099 | SISSA 58/2013/FISI | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the consequences of combining SUSY with a pseudo Nambu-Goldstone
boson Higgs coming from an SO(5)/SO(4) coset and partial compositeness. In
particular, we focus on how electroweak symmetry breaking and the Higgs mass
are reproduced in models where the symmetry SO(5) is linearly realized. The
global symmetry forbids tree-level contributions to the Higgs potential coming
from D-terms, differently from what happens in most of the SUSY little-Higgs
constructions. While the stops are generally heavy, light fermion top partners
below 1 TeV are predicted. In contrast to what happens in non-SUSY composite
Higgs models, they are necessary to reproduce the correct top, rather than
Higgs, mass. En passant, we point out that, independently of SUSY, models where
tR is fully composite and embedded in the 5 of SO(5) generally predict a too
light Higgs.
| [
{
"created": "Thu, 19 Dec 2013 17:48:08 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 2014 09:55:59 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Mar 2014 13:31:46 GMT",
"version": "v3"
}
] | 2014-04-29 | [
[
"Marzocca",
"David",
""
],
[
"Parolini",
"Alberto",
""
],
[
"Serone",
"Marco",
""
]
] | We study the consequences of combining SUSY with a pseudo Nambu-Goldstone boson Higgs coming from an SO(5)/SO(4) coset and partial compositeness. In particular, we focus on how electroweak symmetry breaking and the Higgs mass are reproduced in models where the symmetry SO(5) is linearly realized. The global symmetry forbids tree-level contributions to the Higgs potential coming from D-terms, differently from what happens in most of the SUSY little-Higgs constructions. While the stops are generally heavy, light fermion top partners below 1 TeV are predicted. In contrast to what happens in non-SUSY composite Higgs models, they are necessary to reproduce the correct top, rather than Higgs, mass. En passant, we point out that, independently of SUSY, models where tR is fully composite and embedded in the 5 of SO(5) generally predict a too light Higgs. |
0805.0479 | Ming-Qiu Huang | Jian-Rong Zhang and Ming-Qiu Huang | Mass spectra of the heavy baryons Lambda_Q and Sigma_Q^(*) from QCD sum
rules | RevTeX4, 8 pages with 14 eps figures | Phys.Rev.D77:094002,2008 | 10.1103/PhysRevD.77.094002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use QCD sum rule approach to calculate the masses of the ground-state
Lambda_Q and Sigma_Q^(*) baryons. Contributions of the operators up to
dimension six are included in operator product expansion. The resulting heavy
baryonic masses from the calculations are m_{Lambda_b}=5.69 +/- 0.13 GeV, and
m_{Lambda_c}=2.31 +/- 0.19 GeV for Lambda_Q; m_{Sigma_b}=5.73 +/- 0.21 GeV,
m_{Sigma_b^*}=5.81 +/- 0.19 GeV, m_{Sigma_c}=2.40 +/- 0.31 GeV and
m_{Sigma_c^*}=2.56 +/- 0.24 GeV for Sigma_Q^(*), respectively, which are in
good agreement with the experimental values.
| [
{
"created": "Mon, 5 May 2008 08:15:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zhang",
"Jian-Rong",
""
],
[
"Huang",
"Ming-Qiu",
""
]
] | We use QCD sum rule approach to calculate the masses of the ground-state Lambda_Q and Sigma_Q^(*) baryons. Contributions of the operators up to dimension six are included in operator product expansion. The resulting heavy baryonic masses from the calculations are m_{Lambda_b}=5.69 +/- 0.13 GeV, and m_{Lambda_c}=2.31 +/- 0.19 GeV for Lambda_Q; m_{Sigma_b}=5.73 +/- 0.21 GeV, m_{Sigma_b^*}=5.81 +/- 0.19 GeV, m_{Sigma_c}=2.40 +/- 0.31 GeV and m_{Sigma_c^*}=2.56 +/- 0.24 GeV for Sigma_Q^(*), respectively, which are in good agreement with the experimental values. |
2210.00165 | Nicholas J. Benoit | Nicholas J. Benoit, Takuya Morozumi, Yusuke Shimizu, Kenta Takagi, and
Akihiro Yuu | Renormalization group effects for a rank degenerate Yukawa matrix and
the fate of the massless neutrino | 23 pages, 3 figures; updated subsection titles, and added comments
end of section 4 per referee comments. Conclusion remains the same | null | null | HUPD-2203 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The Type-I seesaw model is a common extension to the Standard Model that
describes neutrino masses. The Type-I seesaw introduces heavy right-handed
neutrinos with Majorana mass that transform as Standard Model electroweak gauge
singlets. We initially study a case with two right-handed neutrinos called the
3-2 model. At an energy scale above the right-handed neutrinos, the effective
neutrino mass matrix is rank degenerate implying the lightest neutrino is
massless. After considering renormalization effects below the two right-handed
neutrinos, the effective neutrino mass matrix remains rank degenerate. Next, we
study a model with three right-handed neutrinos called the 3-3 model. Above the
energy scale of the three right-handed neutrinos, we construct the effective
neutrino mass matrix to be rank degenerate. After solving for the
renormalization effects to energies below the three right-handed neutrinos, we
find the rank of the effective neutrino mass matrix depends on the kernel
solutions of the renormalization group equations. We prove for the simplest
kernel solutions the effective neutrino mass matrix remains rank degenerate.
| [
{
"created": "Sat, 1 Oct 2022 02:05:07 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Oct 2022 08:54:56 GMT",
"version": "v2"
}
] | 2022-10-18 | [
[
"Benoit",
"Nicholas J.",
""
],
[
"Morozumi",
"Takuya",
""
],
[
"Shimizu",
"Yusuke",
""
],
[
"Takagi",
"Kenta",
""
],
[
"Yuu",
"Akihiro",
""
]
] | The Type-I seesaw model is a common extension to the Standard Model that describes neutrino masses. The Type-I seesaw introduces heavy right-handed neutrinos with Majorana mass that transform as Standard Model electroweak gauge singlets. We initially study a case with two right-handed neutrinos called the 3-2 model. At an energy scale above the right-handed neutrinos, the effective neutrino mass matrix is rank degenerate implying the lightest neutrino is massless. After considering renormalization effects below the two right-handed neutrinos, the effective neutrino mass matrix remains rank degenerate. Next, we study a model with three right-handed neutrinos called the 3-3 model. Above the energy scale of the three right-handed neutrinos, we construct the effective neutrino mass matrix to be rank degenerate. After solving for the renormalization effects to energies below the three right-handed neutrinos, we find the rank of the effective neutrino mass matrix depends on the kernel solutions of the renormalization group equations. We prove for the simplest kernel solutions the effective neutrino mass matrix remains rank degenerate. |
hep-ph/0010147 | George Triantaphyllou | George Triantaphyllou (National Technical University of Athens) | Mass generation and the dynamical role of the Katoptron Group | 15 LaTeX pages, some comments added, version published in Modern
Physics Letters A | Mod.Phys.Lett. A16 (2001) 53-62 | 10.1142/S0217732301002274 | NTUA-100/00 | hep-ph hep-ex | null | Heavy mirror fermions along with a new strong gauge interaction capable of
breaking the electroweak gauge symmetry dynamically were recently introduced
under the name of katoptrons. Their main function is to provide a viable
alternative to the Standard-Model Higgs sector. In such a framework, ordinary
fermions acquire masses after the breaking of the strong katoptron group which
allows mixing with their katoptron partners. The purpose of this paper is to
study the elementary-scalars-free mechanism responsible for this breaking and
its implications for the fermion mass hierarchies.
| [
{
"created": "Sat, 14 Oct 2000 14:44:21 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2001 06:44:44 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Triantaphyllou",
"George",
"",
"National Technical University of Athens"
]
] | Heavy mirror fermions along with a new strong gauge interaction capable of breaking the electroweak gauge symmetry dynamically were recently introduced under the name of katoptrons. Their main function is to provide a viable alternative to the Standard-Model Higgs sector. In such a framework, ordinary fermions acquire masses after the breaking of the strong katoptron group which allows mixing with their katoptron partners. The purpose of this paper is to study the elementary-scalars-free mechanism responsible for this breaking and its implications for the fermion mass hierarchies. |
hep-ph/0310247 | Tai-Fu Feng | Tai-Fu Feng, Xue-Qian Li, Jukka Maalampi | The anomalous Higgs-top couplings in the MSSM | Latex, 26 pages + 13 ps figures, final version in PRD | Phys.Rev. D69 (2004) 115007 | 10.1103/PhysRevD.69.115007 | null | hep-ph | null | The anomalous couplings of the top quark and the Higgs boson has been studied
in an effective theory resulting in the framework of the minimal supersymmetric
extension of the standard model (MSSM) when the heavy fields are integrated
out. Constraints on the parameters of the model from the experimental data on
the ratio $R_b={\Gamma(Z\to b\bar{b})/\Gamma(Z\to hadrons)}$ are derived.
| [
{
"created": "Tue, 21 Oct 2003 10:29:23 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Mar 2004 07:08:08 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Feng",
"Tai-Fu",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Maalampi",
"Jukka",
""
]
] | The anomalous couplings of the top quark and the Higgs boson has been studied in an effective theory resulting in the framework of the minimal supersymmetric extension of the standard model (MSSM) when the heavy fields are integrated out. Constraints on the parameters of the model from the experimental data on the ratio $R_b={\Gamma(Z\to b\bar{b})/\Gamma(Z\to hadrons)}$ are derived. |
1602.04074 | Sebastian Wild | Riccardo Catena, Alejandro Ibarra, Sebastian Wild | DAMA confronts null searches in the effective theory of dark
matter-nucleon interactions | 19 pages, 3 figures. Matches published version | null | 10.1088/1475-7516/2016/05/039 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the dark matter interpretation of the modulation signal reported
by the DAMA experiment from the perspective of effective field theories
displaying Galilean invariance. We consider the most general effective coupling
leading to the elastic scattering of a dark matter particle with spin 0 or 1/2
off a nucleon, and we analyze the compatibility of the DAMA signal with the
null results from other direct detection experiments, as well as with the
non-observation of a high energy neutrino flux in the direction of the Sun from
dark matter annihilation. To this end, we develop a novel semi-analytical
approach for comparing experimental results in the high-dimensional parameter
space of the non-relativistic effective theory. Assuming the standard halo
model, we find a strong tension between the dark matter interpretation of the
DAMA modulation signal and the null result experiments. We also list possible
ways-out of this conclusion.
| [
{
"created": "Fri, 12 Feb 2016 15:02:30 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2016 11:33:42 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Catena",
"Riccardo",
""
],
[
"Ibarra",
"Alejandro",
""
],
[
"Wild",
"Sebastian",
""
]
] | We examine the dark matter interpretation of the modulation signal reported by the DAMA experiment from the perspective of effective field theories displaying Galilean invariance. We consider the most general effective coupling leading to the elastic scattering of a dark matter particle with spin 0 or 1/2 off a nucleon, and we analyze the compatibility of the DAMA signal with the null results from other direct detection experiments, as well as with the non-observation of a high energy neutrino flux in the direction of the Sun from dark matter annihilation. To this end, we develop a novel semi-analytical approach for comparing experimental results in the high-dimensional parameter space of the non-relativistic effective theory. Assuming the standard halo model, we find a strong tension between the dark matter interpretation of the DAMA modulation signal and the null result experiments. We also list possible ways-out of this conclusion. |
2403.11581 | Alba Reyes-Torrecilla | A. Reyes-Torrecilla, J. R. Pelaez, P. C. Magalh\~aes | Giant CP violation in charmless three-body $B$ meson decays at LHCb: all
order formalism for meson-meson final state interactions | 6 pages, 2 figures, presented at ExcitedQCD 2024 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LHCb has observed giant CP violation in localized regions of the Dalitz plots
of B to three charmless light mesons. This has been interpreted as an
enhancement due to strong two-body final state interactions. In this talk, we
show how such interactions, described with dispersive analyses of data, can be
implemented beyond the leading order expansion in the two-body re-scattering
amplitude.
| [
{
"created": "Mon, 18 Mar 2024 08:55:37 GMT",
"version": "v1"
}
] | 2024-03-19 | [
[
"Reyes-Torrecilla",
"A.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Magalhães",
"P. C.",
""
]
] | LHCb has observed giant CP violation in localized regions of the Dalitz plots of B to three charmless light mesons. This has been interpreted as an enhancement due to strong two-body final state interactions. In this talk, we show how such interactions, described with dispersive analyses of data, can be implemented beyond the leading order expansion in the two-body re-scattering amplitude. |
hep-ph/9403217 | null | E. J. Chun, H. B. Kim and A. Lukas | Supersymmetric Singlet Majorons and Cosmology | 14 pages, 2 figures, IC/94/40, SNUTP 94-15, TUM - TH - 164/94 | Phys.Lett. B328 (1994) 346-353 | 10.1016/0370-2693(94)91489-3 | null | hep-ph | null | We examine cosmological constraints on the lepton number breaking scale in
supersymmetric singlet majoron models. Special attention is drawn to the model
dependence arising from the particular choice of a certain majoron extension
and a cosmological scenario. We find that the bounds on the symmetry breaking
scale can vary substantially. Large values of this scale can be allowed if the
decoupling temperature of smajoron and majorino exceeds the reheating
temperature of inflation. In the opposite case an upper bound depending on the
majoron model can be obtained which, however, is unlikely to be much larger
than $10^{10}$ GeV.
| [
{
"created": "Thu, 3 Mar 1994 11:02:14 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Chun",
"E. J.",
""
],
[
"Kim",
"H. B.",
""
],
[
"Lukas",
"A.",
""
]
] | We examine cosmological constraints on the lepton number breaking scale in supersymmetric singlet majoron models. Special attention is drawn to the model dependence arising from the particular choice of a certain majoron extension and a cosmological scenario. We find that the bounds on the symmetry breaking scale can vary substantially. Large values of this scale can be allowed if the decoupling temperature of smajoron and majorino exceeds the reheating temperature of inflation. In the opposite case an upper bound depending on the majoron model can be obtained which, however, is unlikely to be much larger than $10^{10}$ GeV. |
2011.10565 | Andrea Tesi | Michele Redi, Andrea Tesi, Hannah Tillim | Gravitational Production of a Conformal Dark Sector | 24 pages, 2 figures. v2) factor 2 fixed, references and
clarifications added, results unchanged | null | 10.1007/JHEP05(2021)010 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark sectors with purely gravitational couplings to the Standard Model are
unavoidably populated from the SM plasma by graviton exchange, and naturally
provide DM candidates. We examine the production in the relativistic regime
where the dark sector is approximately scale invariant, providing general
analytical formulas that depend solely on the central charge of the dark
sector. We then assess the relevance of interactions that can lead to a variety
of phenomena including thermalisation, nonperturbative mass gaps,
out-of-equilibrium phase transitions and cannibalism in the dark sector. As an
illustrative example we consider the dark glueball scenario in this light and
show it to be a viable DM candidate due to the suppression of gravitational
production. We go on to extend these results to strongly coupled CFTs and their
holographic duals at large-N with the dark dilaton as the DM candidate.
| [
{
"created": "Fri, 20 Nov 2020 18:59:32 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2021 13:39:24 GMT",
"version": "v2"
}
] | 2021-05-19 | [
[
"Redi",
"Michele",
""
],
[
"Tesi",
"Andrea",
""
],
[
"Tillim",
"Hannah",
""
]
] | Dark sectors with purely gravitational couplings to the Standard Model are unavoidably populated from the SM plasma by graviton exchange, and naturally provide DM candidates. We examine the production in the relativistic regime where the dark sector is approximately scale invariant, providing general analytical formulas that depend solely on the central charge of the dark sector. We then assess the relevance of interactions that can lead to a variety of phenomena including thermalisation, nonperturbative mass gaps, out-of-equilibrium phase transitions and cannibalism in the dark sector. As an illustrative example we consider the dark glueball scenario in this light and show it to be a viable DM candidate due to the suppression of gravitational production. We go on to extend these results to strongly coupled CFTs and their holographic duals at large-N with the dark dilaton as the DM candidate. |
hep-ph/0106085 | Guido Altarelli | Guido Altarelli | Models of neutrino masses and mixings | 22 pages, talk given at the 9th Int. Workshop on Neutrino Telescopes,
Venice, March 6-9, 2001 | null | null | CERN-TH/2001-144 | hep-ph | null | We briefly review models of neutrino masses and mixings. In view of the
existing experimental ambiguities many possibilities are still open. After an
overview of the main alternative options we focus on the most constrained class
of models based on three widely split light neutrinos within SUSY Grand
Unification.
| [
{
"created": "Fri, 8 Jun 2001 09:52:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Altarelli",
"Guido",
""
]
] | We briefly review models of neutrino masses and mixings. In view of the existing experimental ambiguities many possibilities are still open. After an overview of the main alternative options we focus on the most constrained class of models based on three widely split light neutrinos within SUSY Grand Unification. |
hep-ph/9906203 | Brian Cox | B. E. Cox | High-t Diffraction at HERA | 3 pages, 2 figures, Talk presented at DIS99, Zeuthen, Germany | Nucl.Phys.Proc.Suppl.79:315-317,1999 | 10.1016/S0920-5632(99)00709-4 | null | hep-ph | null | The double dissociation photoproduction cross section for the process gamma p
-> XY, in which the systems X and Y are separated by a large rapidity gap, is
measured at large 4-momentum transfer squared |t| > 20 GeV^2 by the H1
Collaboration at HERA. This measurement provides for the first time a direct
measurement of the energy dependence of the gap production process at high |t|.
| [
{
"created": "Tue, 1 Jun 1999 13:16:29 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Cox",
"B. E.",
""
]
] | The double dissociation photoproduction cross section for the process gamma p -> XY, in which the systems X and Y are separated by a large rapidity gap, is measured at large 4-momentum transfer squared |t| > 20 GeV^2 by the H1 Collaboration at HERA. This measurement provides for the first time a direct measurement of the energy dependence of the gap production process at high |t|. |
1405.1434 | Florian Staub | Werner Porod, Florian Staub, Avelino Vicente | A Flavor Kit for BSM models | 68 pages; PreSARAH and FlavorKit (included in SARAH 4.2.0) can be
downloaded at http://sarah.hepforge.org/FlavorKit.html; v2: minor extensions,
matches published version; v3: unifying layout in the appendix | Eur. Phys. J. C (2014) 74:2992 | 10.1140/epjc/s10052-014-2992-2 | BONN-TH-2014-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new kit for the study of flavor observables in models beyond the
standard model. The setup is based on the public codes SARAH and SPheno and
allows for an easy implementation of new observables. The Wilson coefficients
of the corresponding operators in the effective Lagrangian are computed by
SPheno modules written by SARAH. New operators can also be added by the user in
a modular way. For this purpose a handy Mathematica package called PreSARAH has
been developed. This uses FeynArts and FormCalc to derive the generic form
factors at tree- and 1-loop levels and to generate the necessary input files
for SARAH. This framework has been used to implement BR($\ell_\alpha\to
\ell_\beta \gamma$), BR($\ell_\alpha \to 3\, \ell_\beta$), CR($\mu-e,A$),
BR($\tau \to P \, \ell$), BR($h\to \ell_\alpha \ell_\beta$), BR($Z\to
\ell_\alpha \ell_\beta$), BR($B_{s,d}^0 \to \ell \bar{\ell}$), BR($\bar B \to
X_s\gamma$), BR($\bar B \to X_s \ell \bar{\ell}$), BR($\bar B \to X_{d,s} \nu
\bar \nu$), BR($K^+ \to \pi^+ \nu \bar \nu$), BR($K_L \to \pi^0 \nu \bar \nu$),
$\Delta M_{B_s,B_d}$, $\Delta M_K$, $\varepsilon_K$, BR($B \to K \mu
\bar{\mu}$), BR($B\to \ell \nu$), BR($D_s \to \ell \nu$) and BR($K \to \ell
\nu$) in SARAH. Predictions for these observables can now be obtained in a wide
range of SUSY and non-SUSY models. Finally, the user can use the same approach
to easily compute additional observables.
| [
{
"created": "Tue, 6 May 2014 20:01:10 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Sep 2014 16:13:15 GMT",
"version": "v2"
},
{
"created": "Mon, 9 May 2016 19:48:50 GMT",
"version": "v3"
}
] | 2016-05-11 | [
[
"Porod",
"Werner",
""
],
[
"Staub",
"Florian",
""
],
[
"Vicente",
"Avelino",
""
]
] | We present a new kit for the study of flavor observables in models beyond the standard model. The setup is based on the public codes SARAH and SPheno and allows for an easy implementation of new observables. The Wilson coefficients of the corresponding operators in the effective Lagrangian are computed by SPheno modules written by SARAH. New operators can also be added by the user in a modular way. For this purpose a handy Mathematica package called PreSARAH has been developed. This uses FeynArts and FormCalc to derive the generic form factors at tree- and 1-loop levels and to generate the necessary input files for SARAH. This framework has been used to implement BR($\ell_\alpha\to \ell_\beta \gamma$), BR($\ell_\alpha \to 3\, \ell_\beta$), CR($\mu-e,A$), BR($\tau \to P \, \ell$), BR($h\to \ell_\alpha \ell_\beta$), BR($Z\to \ell_\alpha \ell_\beta$), BR($B_{s,d}^0 \to \ell \bar{\ell}$), BR($\bar B \to X_s\gamma$), BR($\bar B \to X_s \ell \bar{\ell}$), BR($\bar B \to X_{d,s} \nu \bar \nu$), BR($K^+ \to \pi^+ \nu \bar \nu$), BR($K_L \to \pi^0 \nu \bar \nu$), $\Delta M_{B_s,B_d}$, $\Delta M_K$, $\varepsilon_K$, BR($B \to K \mu \bar{\mu}$), BR($B\to \ell \nu$), BR($D_s \to \ell \nu$) and BR($K \to \ell \nu$) in SARAH. Predictions for these observables can now be obtained in a wide range of SUSY and non-SUSY models. Finally, the user can use the same approach to easily compute additional observables. |
hep-ph/0410090 | Bilenky Samoil | S. M. Bilenky | The History of Neutrino Oscillations | A report at the ``Nobel Symposium on Neutrino physics'', Haga Slott,
Enkoping, Sweden, August 19-24, 2004 | Phys.Scripta T121 (2005) 17-22 | 10.1088/0031-8949/2005/T121/001 | null | hep-ph | null | The early history of neutrino masses, mixing and oscillations is briefly
reviewed.
| [
{
"created": "Wed, 6 Oct 2004 14:48:46 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bilenky",
"S. M.",
""
]
] | The early history of neutrino masses, mixing and oscillations is briefly reviewed. |
hep-ph/0604053 | Andreas Vogt | A. Mitov, S. Moch (DESY, Zeuthen), A. Vogt (Durham Univ., IPPP) | Next-to-Next-to-Leading Order Evolution of Non-Singlet Fragmentation
Functions | 10 pages, LaTeX, 2 eps-figures | Phys.Lett.B638:61-67,2006 | 10.1016/j.physletb.2006.05.005 | DESY 06-036, DCPT/06/40, IPPP/06/20 | hep-ph | null | We have investigated the next-to-next-to-leading order (NNLO) corrections to
inclusive hadron production in e^+e^- annihilation and the related parton
fragmentation distributions, the `time-like' counterparts of the `space-like'
deep-inelastic structure functions and parton densities. We have re-derived the
corresponding second-order coefficient functions in massless perturbative QCD,
which so far had been calculated only by one group. Moreover we present, for
the first time, the third-order splitting functions governing the NNLO
evolution of flavour non-singlet fragmentation distributions. These results
have been obtained by two independent methods relating time-like quantities to
calculations performed in deep-inelastic scattering. We briefly illustrate the
numerical size of the NNLO corrections, and make a prediction for the
difference of the yet unknown time-like and space-like splitting functions at
the fourth order in the strong coupling constant.
| [
{
"created": "Thu, 6 Apr 2006 09:57:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mitov",
"A.",
"",
"DESY, Zeuthen"
],
[
"Moch",
"S.",
"",
"DESY, Zeuthen"
],
[
"Vogt",
"A.",
"",
"Durham Univ., IPPP"
]
] | We have investigated the next-to-next-to-leading order (NNLO) corrections to inclusive hadron production in e^+e^- annihilation and the related parton fragmentation distributions, the `time-like' counterparts of the `space-like' deep-inelastic structure functions and parton densities. We have re-derived the corresponding second-order coefficient functions in massless perturbative QCD, which so far had been calculated only by one group. Moreover we present, for the first time, the third-order splitting functions governing the NNLO evolution of flavour non-singlet fragmentation distributions. These results have been obtained by two independent methods relating time-like quantities to calculations performed in deep-inelastic scattering. We briefly illustrate the numerical size of the NNLO corrections, and make a prediction for the difference of the yet unknown time-like and space-like splitting functions at the fourth order in the strong coupling constant. |
0808.2305 | D. Delepine | D. Delepine, J. L. Lucio M. (Universidad de Guanajuato, Mexico), J. A.
Mendoza S.(Universidad de Pamplona, Colombia), Carlos A. Ramirez (Universidad
Industrial de Santander, Colombia) | A Consistent Scenario for B to PS Decays | 10 pages, no figures | Phys.Rev.D78:114016,2008 | 10.1103/PhysRevD.78.114016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider B to PS decays where P stands for pseudoscalar and S for a heavy
(~1500 MeV) scalar meson. We achieve agreement with available experimental data
-- which includes a two orders of magnitude hierarchy -- assuming the scalars
mesons are two quark states. The contribution of the dipolar penguin operator
O_{11} is quantified.
| [
{
"created": "Sun, 17 Aug 2008 18:24:47 GMT",
"version": "v1"
}
] | 2008-12-30 | [
[
"Delepine",
"D.",
"",
"Universidad de Guanajuato, Mexico"
],
[
"M.",
"J. L. Lucio",
"",
"Universidad de Guanajuato, Mexico"
],
[
"S.",
"J. A. Mendoza",
"",
"Universidad de Pamplona, Colombia"
],
[
"Ramirez",
"Carlos A.",
"",
"Universidad\n Industrial de Santander, Colombia"
]
] | We consider B to PS decays where P stands for pseudoscalar and S for a heavy (~1500 MeV) scalar meson. We achieve agreement with available experimental data -- which includes a two orders of magnitude hierarchy -- assuming the scalars mesons are two quark states. The contribution of the dipolar penguin operator O_{11} is quantified. |
1905.00184 | Sunil Bansal | R. Kumar, M. Bansal, S. Bansal | Jet fragmentation as a tool to explore double parton scattering using
Z-boson + jets processes at the LHC | 14 pages, 4 figures | Phys. Rev. D 99, 094025 (2019) | 10.1103/PhysRevD.99.094025 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Large Hadron Collider witnesses the highest ever production cross-section
of double parton scattering processes. The production of a Z-boson along with
two jets from double parton scattering provides a unique opportunity to explore
the kinematics of double parton scattering processes and their dependence on
the scale of the second interaction. The experimental measurement of this
process is largely contaminated by Z + jets production from single parton
scattering. In this paper, fragmentation properties of a jet are explored to
check their sensitivity towards double parton scattering. The present study is
performed using simulated Z + jets events, produced with \textsc{madgraph} and
\textsc{powheg} Monte-Carlo event generators, hadronized and parton showered
using \textsc{pythia}8. The effect of different hadronization model on the
discrimination based on the fragmentation properties of a jet is also
investigated by using events simulated with \textsc{herwig}++. It is observed
that discrimination based on the fragmentation properties of a jet can
significantly suppress the background from single parton scattering, which
results into 40--50\% gain in the contribution of double parton scattering.
| [
{
"created": "Wed, 1 May 2019 04:47:44 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Kumar",
"R.",
""
],
[
"Bansal",
"M.",
""
],
[
"Bansal",
"S.",
""
]
] | The Large Hadron Collider witnesses the highest ever production cross-section of double parton scattering processes. The production of a Z-boson along with two jets from double parton scattering provides a unique opportunity to explore the kinematics of double parton scattering processes and their dependence on the scale of the second interaction. The experimental measurement of this process is largely contaminated by Z + jets production from single parton scattering. In this paper, fragmentation properties of a jet are explored to check their sensitivity towards double parton scattering. The present study is performed using simulated Z + jets events, produced with \textsc{madgraph} and \textsc{powheg} Monte-Carlo event generators, hadronized and parton showered using \textsc{pythia}8. The effect of different hadronization model on the discrimination based on the fragmentation properties of a jet is also investigated by using events simulated with \textsc{herwig}++. It is observed that discrimination based on the fragmentation properties of a jet can significantly suppress the background from single parton scattering, which results into 40--50\% gain in the contribution of double parton scattering. |
hep-ph/0502060 | Joaquim Matias | Frank Kr\"uger and Joaquim Matias | Probing New Physics Via the Transverse Amplitudes of B0-> K*0(-> K- pi+)
l+l- at Large Recoil | 21 pages, 16 figures. Minor typo in Eq. (4.8) corrected; version to
appear in Phys. Rev. D | Phys.Rev.D71:094009,2005 | 10.1103/PhysRevD.71.094009 | UAB-FT 560 | hep-ph | null | We perform an analysis of the K* polarization states in the exclusive B meson
decay B0->K*0(-> K- pi+)l+ l- (l=e, mu, tau) in the low dilepton mass region,
where the final vector meson has a large energy. Working in the transversity
basis, we study various observables that involve the K* spin amplitudes Aperp,
Apar, A0 by exploiting the heavy-to-light form factor relations in the heavy
quark and large-E_K* limit. We find that at leading order in 1/m_b and alpha_s
the form-factor dependence of the asymmetries that involve transversely
polarized K* completely drops out. At next-to-leading logarithmic order,
including factorizable and non-factorizable corrections, the theoretical errors
for the transverse asymmetries turn out to be small in the standard model (SM).
Integrating over the lower part of the dimuon mass region, and varying the
theoretical input parameters, the SM predicts A_T^(1)=0.9986+/- 0.0002 and
A_T^(2)=-0.043+/- 0.003. In addition, the longitudinal and transverse
polarization fractions are found to be (69+/-3)% and (31+/-3)% respectively, so
that Gamma_L/Gamma_T = 2.23+/-0.31. Beyond the SM, we focus on new physics that
mainly gives sizable contributions to the coefficients C_7^eff' of the
electromagnetic dipole operators. Taking into account experimental data on rare
B decays, we find large effects of new physics in the transverse asymmetries.
Furthermore, we show that a measurement of longitudinal and transverse
polarization fractions will provide complementary information on physics beyond
the SM.
| [
{
"created": "Mon, 7 Feb 2005 10:28:17 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2005 14:42:31 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Krüger",
"Frank",
""
],
[
"Matias",
"Joaquim",
""
]
] | We perform an analysis of the K* polarization states in the exclusive B meson decay B0->K*0(-> K- pi+)l+ l- (l=e, mu, tau) in the low dilepton mass region, where the final vector meson has a large energy. Working in the transversity basis, we study various observables that involve the K* spin amplitudes Aperp, Apar, A0 by exploiting the heavy-to-light form factor relations in the heavy quark and large-E_K* limit. We find that at leading order in 1/m_b and alpha_s the form-factor dependence of the asymmetries that involve transversely polarized K* completely drops out. At next-to-leading logarithmic order, including factorizable and non-factorizable corrections, the theoretical errors for the transverse asymmetries turn out to be small in the standard model (SM). Integrating over the lower part of the dimuon mass region, and varying the theoretical input parameters, the SM predicts A_T^(1)=0.9986+/- 0.0002 and A_T^(2)=-0.043+/- 0.003. In addition, the longitudinal and transverse polarization fractions are found to be (69+/-3)% and (31+/-3)% respectively, so that Gamma_L/Gamma_T = 2.23+/-0.31. Beyond the SM, we focus on new physics that mainly gives sizable contributions to the coefficients C_7^eff' of the electromagnetic dipole operators. Taking into account experimental data on rare B decays, we find large effects of new physics in the transverse asymmetries. Furthermore, we show that a measurement of longitudinal and transverse polarization fractions will provide complementary information on physics beyond the SM. |
1810.00574 | Kohei Fujikura | Kohei Fujikura, Kohei Kamada, Yuichiro Nakai, Masahide Yamaguchi | Phase Transitions in Twin Higgs Models | 33 pages, 5 figures; v2: journal version | JHEP 1812 (2018) 018 | 10.1007/JHEP12(2018)018 | CTPU-PTC-18-27, RESCEU-12/18 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study twin Higgs models at non-zero temperature and discuss cosmological
phase transitions as well as their implications on electroweak baryogenesis and
gravitational waves. It is shown that the expectation value of the Higgs field
at the critical temperature of the electroweak phase transition is much smaller
than the critical temperature, which indicates two important facts: (i) the
electroweak phase transition cannot be analyzed perturbatively (ii) the
electroweak baryogenesis is hardly realized in the typical realizations of twin
Higgs models. We also analyze the phase transition associated with the global
symmetry breaking, through which the Standard Model Higgs is identified with
one of the pseudo-Nambu-Goldstone bosons in terms of its linear realization,
with and without supersymmetry. For this phase transition, we show that, only
in the supersymmetric case, there are still some parameter spaces, in which the
perturbative approach is validated and the phase transition is the first order.
We find that the stochastic gravitational wave background is generated through
this first order phase transition, but it is impossible to be detected by
DECIGO or BBO in the linear realization and the decoupling limit. The detection
of stochastic gravitational wave background with the feature of first order
phase transition, therefore, will give strong constraints on twin Higgs models.
| [
{
"created": "Mon, 1 Oct 2018 08:27:14 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Dec 2018 04:59:19 GMT",
"version": "v2"
}
] | 2018-12-27 | [
[
"Fujikura",
"Kohei",
""
],
[
"Kamada",
"Kohei",
""
],
[
"Nakai",
"Yuichiro",
""
],
[
"Yamaguchi",
"Masahide",
""
]
] | We study twin Higgs models at non-zero temperature and discuss cosmological phase transitions as well as their implications on electroweak baryogenesis and gravitational waves. It is shown that the expectation value of the Higgs field at the critical temperature of the electroweak phase transition is much smaller than the critical temperature, which indicates two important facts: (i) the electroweak phase transition cannot be analyzed perturbatively (ii) the electroweak baryogenesis is hardly realized in the typical realizations of twin Higgs models. We also analyze the phase transition associated with the global symmetry breaking, through which the Standard Model Higgs is identified with one of the pseudo-Nambu-Goldstone bosons in terms of its linear realization, with and without supersymmetry. For this phase transition, we show that, only in the supersymmetric case, there are still some parameter spaces, in which the perturbative approach is validated and the phase transition is the first order. We find that the stochastic gravitational wave background is generated through this first order phase transition, but it is impossible to be detected by DECIGO or BBO in the linear realization and the decoupling limit. The detection of stochastic gravitational wave background with the feature of first order phase transition, therefore, will give strong constraints on twin Higgs models. |
1407.8321 | Karim Benakli | Karim Benakli, Luc Darm\'e and Yaron Oz | The Slow Gravitino | 24 pages | null | 10.1007/JHEP10(2014)121 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When the supersymmetry breaking sector is a fluid background, Lorentz
invariance is broken spontaneously. The super-Higgs mechanism leads to a
gravitino Lagrangian with Lorentz symmetry violating terms. We analyse the
resulting field equations and constraints. We identify the physical spin 3/2
and spin 1/2 helicity states, derive their equations of motion and construct
the propagator. The violation of Lorentz symmetry implies that the longitudinal
mode has a non-relativistic dispersion relation, whose speed is lower than the
speed of light. We briefly comment on possible implications to gravitino
cosmology and phenomenology.
| [
{
"created": "Thu, 31 Jul 2014 09:01:37 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Benakli",
"Karim",
""
],
[
"Darmé",
"Luc",
""
],
[
"Oz",
"Yaron",
""
]
] | When the supersymmetry breaking sector is a fluid background, Lorentz invariance is broken spontaneously. The super-Higgs mechanism leads to a gravitino Lagrangian with Lorentz symmetry violating terms. We analyse the resulting field equations and constraints. We identify the physical spin 3/2 and spin 1/2 helicity states, derive their equations of motion and construct the propagator. The violation of Lorentz symmetry implies that the longitudinal mode has a non-relativistic dispersion relation, whose speed is lower than the speed of light. We briefly comment on possible implications to gravitino cosmology and phenomenology. |
1311.4697 | Kanchan Khemchandani | K. P. Khemchandani, A. Martinez Torres, M. Nielsen, F. S. Navarra, D.
Jido, A. Hosaka, E. Oset | Interpreting the peak structures around 1800 MeV in the BES data on
$J/\Psi \to \phi \pi^+ \pi^-$, $J/\Psi\to \gamma \omega \phi$ | Proceedings for the nuclear physics meeting ("XXXVI Reuni\~ao de
trabalho sobre f\'isica nuclear no Brasil") held in Maresias during Sept.
1-5. To be published as AIP proceedings | null | 10.1063/1.4901801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we present an interpretation for the experimental data available
on two different processes, namely, $J/\Psi \to \phi \pi^+ \pi^-$, $J/\Psi\to
\gamma \omega \phi$, which seem to indicate existence of two new resonances
with the same quantum numbers ($J^{\pi c}=0^{++}, I = 0$) and very similar mass
(~1800 MeV) but with very different decay properties. However, our studies show
that the peak structure found in the $\omega \phi$ invariant mass, in $J/\Psi
\to \gamma \omega \phi$, is a manifestation of the well known $f_0(1710)$ while
the cross section enhancement found in $J/\Psi \to \phi \pi^+ \pi^-$ is indeed
a new $f_0$ resonance with mass near 1800 MeV. We present an explanation for
the different decay properties of these two scalar resonances.
| [
{
"created": "Tue, 19 Nov 2013 11:18:09 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Khemchandani",
"K. P.",
""
],
[
"Torres",
"A. Martinez",
""
],
[
"Nielsen",
"M.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Jido",
"D.",
""
],
[
"Hosaka",
"A.",
""
],
[
"Oset",
"E.",
""
]
] | In this talk we present an interpretation for the experimental data available on two different processes, namely, $J/\Psi \to \phi \pi^+ \pi^-$, $J/\Psi\to \gamma \omega \phi$, which seem to indicate existence of two new resonances with the same quantum numbers ($J^{\pi c}=0^{++}, I = 0$) and very similar mass (~1800 MeV) but with very different decay properties. However, our studies show that the peak structure found in the $\omega \phi$ invariant mass, in $J/\Psi \to \gamma \omega \phi$, is a manifestation of the well known $f_0(1710)$ while the cross section enhancement found in $J/\Psi \to \phi \pi^+ \pi^-$ is indeed a new $f_0$ resonance with mass near 1800 MeV. We present an explanation for the different decay properties of these two scalar resonances. |
hep-ph/9509317 | Christoph Best | A. Schafer | Interplay between polarized DIS and RHIC spin physics | Talk given at the Workshop on Deep Inelastic scattering and QCD,
Paris, April 1995, LaTeX, 4 pp, 5 eps figures and style file included as
compressed tar file. Available at
ftp://ftp.th.physik.uni-frankfurt.de/pub/schaefer/dis.ps.Z [added figures -
we had an email delay; corrected URL] | null | null | null | hep-ph | null | The complementarity of polarized DIS experiments and polarized Proton-Proton
experiments is illustrated for two examples. It is shown how the twist-3 part
of the second moment of $g_2(x,Q^2)$ and the single-spin photon asymmetry are
connected and it is discussed how the polarized gluon distribution can be
obtained from the measurement of direct gamma asymmetries.
| [
{
"created": "Mon, 18 Sep 1995 11:18:27 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 1995 10:40:31 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Schafer",
"A.",
""
]
] | The complementarity of polarized DIS experiments and polarized Proton-Proton experiments is illustrated for two examples. It is shown how the twist-3 part of the second moment of $g_2(x,Q^2)$ and the single-spin photon asymmetry are connected and it is discussed how the polarized gluon distribution can be obtained from the measurement of direct gamma asymmetries. |
2011.11105 | Ilkay Turk Cakir | I. Turk Cakir (Giresun University), O. Cakir (Ankara University), H.
Denizli (Bolu Abant Izzet Baysal University), A. Senol (Bolu Abant Izzet
Baysal University), A. Yilmaz (Giresun University) | Investigation of Charged Higgs Boson in the Bottom and Top Quark Decay
Channel at the FCC-hh | 5 pages, 8 figures | null | 10.1016/j.physletb.2021.136375 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | After the recent discovery of a neutral Higgs boson with a mass about 125
GeV, we assess the extend of discovery potential of future circular hadron
collider (FCC-hh) for a charged Higgs boson in the bottom and top quark decay
channel. The charged Higgs boson can be produced through the pp->h^{-}t+X
process with a subsequent decay h^{-}->b bar{t} channel. This decay channel is
particularly important for studying the charged Higgs boson heavier than the
top quark. We consider an extension of the standard model Higgs sector, namely
two Higgs doublet model (2HDM), and perform a dedicated signal significance
analysis to test this channel for the FCC-hh running at the center of mass
energy of 100 TeV and the integrated luminosity of 1 ab^{-1} (initial) and 30
ab^{-1} (ultimate). We find that an important part of the parameter spaces of
two Higgs doublet model are examinable at the FCC-hh.
| [
{
"created": "Sun, 22 Nov 2020 21:01:26 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2020 09:27:49 GMT",
"version": "v2"
}
] | 2021-05-26 | [
[
"Cakir",
"I. Turk",
"",
"Giresun University"
],
[
"Cakir",
"O.",
"",
"Ankara University"
],
[
"Denizli",
"H.",
"",
"Bolu Abant Izzet Baysal University"
],
[
"Senol",
"A.",
"",
"Bolu Abant Izzet\n Baysal University"
],
[
"Yilmaz",
"A.",
"",
"Giresun University"
]
] | After the recent discovery of a neutral Higgs boson with a mass about 125 GeV, we assess the extend of discovery potential of future circular hadron collider (FCC-hh) for a charged Higgs boson in the bottom and top quark decay channel. The charged Higgs boson can be produced through the pp->h^{-}t+X process with a subsequent decay h^{-}->b bar{t} channel. This decay channel is particularly important for studying the charged Higgs boson heavier than the top quark. We consider an extension of the standard model Higgs sector, namely two Higgs doublet model (2HDM), and perform a dedicated signal significance analysis to test this channel for the FCC-hh running at the center of mass energy of 100 TeV and the integrated luminosity of 1 ab^{-1} (initial) and 30 ab^{-1} (ultimate). We find that an important part of the parameter spaces of two Higgs doublet model are examinable at the FCC-hh. |
1601.07288 | Haijing Zhou | Haijing Zhou, Zhaoxia Heng, Dongwei Li | The properties of the Higgs bosons and Pair Production of the SM-like
Higgs Boson in \lambda-SUSY at the LHC | 16 pages,8 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Compared with the MSSM or the NMSSM with a low \lambda, \lambda-SUSY theory
with a large \lambda around one has been deemed as a most natural realization
of NMSSM. In this work, we treat the next-to-lightest CP-even Higgs boson as
the SM-like Higgs boson in \lambda-SUSY and study the properties of the Higgs
bosons and the pair production of the SM-like Higgs boson by considering
various experiment constraints. We find that naturalness plays an important
role in selecting the parameter space of \lambda-SUSY. In the most natural
region of parameter space, the triple self coupling of the SM-like Higgs boson
compared with its SM prediction may get enhanced by a factor about 7, and the
most dominant contribution to the Higgs pair production comes from the triple
self coupling of the SM-like Higgs boson and the production rate can be greatly
enhanced, maximally 10 times larger than the SM prediction.
| [
{
"created": "Wed, 27 Jan 2016 08:41:46 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2016 08:35:12 GMT",
"version": "v2"
}
] | 2016-02-01 | [
[
"Zhou",
"Haijing",
""
],
[
"Heng",
"Zhaoxia",
""
],
[
"Li",
"Dongwei",
""
]
] | Compared with the MSSM or the NMSSM with a low \lambda, \lambda-SUSY theory with a large \lambda around one has been deemed as a most natural realization of NMSSM. In this work, we treat the next-to-lightest CP-even Higgs boson as the SM-like Higgs boson in \lambda-SUSY and study the properties of the Higgs bosons and the pair production of the SM-like Higgs boson by considering various experiment constraints. We find that naturalness plays an important role in selecting the parameter space of \lambda-SUSY. In the most natural region of parameter space, the triple self coupling of the SM-like Higgs boson compared with its SM prediction may get enhanced by a factor about 7, and the most dominant contribution to the Higgs pair production comes from the triple self coupling of the SM-like Higgs boson and the production rate can be greatly enhanced, maximally 10 times larger than the SM prediction. |
hep-ph/0411007 | Yogendra Srivastava | G. Pancheri, Y. Srivastava, N. Staffolani | A sum rule for elastic scattering | Presented by Y. Srivastava at ISMD04, Sonoma State University. Under
publication in Acta Physica Polonica. Latex format, 1 *.eps file, 7 pages | Acta Phys.Polon. B36 (2005) 749-754 | null | null | hep-ph | null | A sum rule is derived for elastic scattering of hadrons at high energies
which is in good agreement with experimental data on $p\bar{p}$ available upto
the maximum energy $\sqrt{s} = 2 TeV$. Physically, our sum rule reflects the
way unitarity correlates and limits how large the elastic amplitude can be as a
function of energy to how fast it decreases as a function of the momentum
transfer. The universality of our result is justified through our earlier
result on equipartition of quark and glue momenta obtained from the virial
theorem for massless quarks and the Wilson conjecture
| [
{
"created": "Sat, 30 Oct 2004 20:21:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pancheri",
"G.",
""
],
[
"Srivastava",
"Y.",
""
],
[
"Staffolani",
"N.",
""
]
] | A sum rule is derived for elastic scattering of hadrons at high energies which is in good agreement with experimental data on $p\bar{p}$ available upto the maximum energy $\sqrt{s} = 2 TeV$. Physically, our sum rule reflects the way unitarity correlates and limits how large the elastic amplitude can be as a function of energy to how fast it decreases as a function of the momentum transfer. The universality of our result is justified through our earlier result on equipartition of quark and glue momenta obtained from the virial theorem for massless quarks and the Wilson conjecture |
1808.07224 | Helen Brooks | Helen Brooks, Peter Skands | Average Event Properties from LHC to FCC-hh | 25 pages, 10 figures, 9 tables; updated to version accepted for
publication | P. Eur. Phys. J. C (2018) 78: 963 | 10.1140/epjc/s10052-018-6460-2 | CoEPP-MN-18-4, MCNET-18-23 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of design studies for future $pp$ colliders, we present a set
of predictions for average soft-QCD event properties for $pp$ collisions at
$E_\mathrm{CM} = 14$, $27$, and $100$ TeV. The current default Monash 2013 tune
of the PYTHIA 8.2 event generator is used as the baseline for the
extrapolations, with uncertainties evaluated via variations of cross-section
parametrisations, PDFs, MPI energy-scaling parameters, and colour-reconnection
modelling, subject to current LHC constraints. The observables included in the
study are total and inelastic cross sections, inelastic average energy and
track densities per unit pseudorapidity (inside $|\eta|\le 6$), average track
$p_\perp$, and jet cross sections for 50- and 100-GeV anti-$k_T$ jets with
$\Delta R=0.4$, using aMC@NLO in conjunction with PYTHIA 8 for the latter.
| [
{
"created": "Wed, 22 Aug 2018 05:22:29 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2018 02:17:40 GMT",
"version": "v2"
}
] | 2018-11-28 | [
[
"Brooks",
"Helen",
""
],
[
"Skands",
"Peter",
""
]
] | In the context of design studies for future $pp$ colliders, we present a set of predictions for average soft-QCD event properties for $pp$ collisions at $E_\mathrm{CM} = 14$, $27$, and $100$ TeV. The current default Monash 2013 tune of the PYTHIA 8.2 event generator is used as the baseline for the extrapolations, with uncertainties evaluated via variations of cross-section parametrisations, PDFs, MPI energy-scaling parameters, and colour-reconnection modelling, subject to current LHC constraints. The observables included in the study are total and inelastic cross sections, inelastic average energy and track densities per unit pseudorapidity (inside $|\eta|\le 6$), average track $p_\perp$, and jet cross sections for 50- and 100-GeV anti-$k_T$ jets with $\Delta R=0.4$, using aMC@NLO in conjunction with PYTHIA 8 for the latter. |
hep-ph/0505044 | Joan Rojo | Joan Rojo and Andrea Piccione (for the NNPDF Collaboration) | The neural network approach to parton fitting | To appear in the proceedings of "DIS 2005: XIII International
Workshop on Deep Inelatic Scattering" (Madison, Wisconsin, April 2005). 5
pages, 4 figures | null | null | null | hep-ph | null | We introduce the neural network approach to global fits of parton
distribution functions. First we review previous work on unbiased
parametrizations of deep-inelastic structure functions with faithful estimation
of their uncertainties, and then we summarize the current status of neural
network parton distribution fits.
| [
{
"created": "Fri, 6 May 2005 09:40:08 GMT",
"version": "v1"
},
{
"created": "Thu, 12 May 2005 07:37:34 GMT",
"version": "v2"
}
] | 2019-08-14 | [
[
"Rojo",
"Joan",
"",
"for the NNPDF Collaboration"
],
[
"Piccione",
"Andrea",
"",
"for the NNPDF Collaboration"
]
] | We introduce the neural network approach to global fits of parton distribution functions. First we review previous work on unbiased parametrizations of deep-inelastic structure functions with faithful estimation of their uncertainties, and then we summarize the current status of neural network parton distribution fits. |
hep-ph/0202180 | R. A. Schneider | R. A. Schneider, T. Renk, W. Weise | Quasiparticles in QCD thermodynamics and applications | 6 pages, 4 figures, Talk given at the International Workshop XXX on
Gross Properties of Nuclei and Nuclear Excitations, Hirschegg, Austria | null | null | null | hep-ph | null | We propose a novel quasiparticle interpretation of the equation of state of
deconfined QCD at finite temperature. Using appropriate thermal masses, we
introduce a phenomenological parametrization of the onset of confinement in the
vicinity of the phase transition. Lattice results of the energy density, the
pressure and the interaction measure of pure SU(3) gauge theory are well
reproduced. A relation between the thermal energy density of the Yang-Mills
vacuum and the chromomagnetic condensate <B^2>_T is found. We also present the
two flavour QCD equation of state for realistic quark masses and apply the
model to dilepton production in ultrarelativistic heavy-ion collisions.
| [
{
"created": "Tue, 19 Feb 2002 10:21:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schneider",
"R. A.",
""
],
[
"Renk",
"T.",
""
],
[
"Weise",
"W.",
""
]
] | We propose a novel quasiparticle interpretation of the equation of state of deconfined QCD at finite temperature. Using appropriate thermal masses, we introduce a phenomenological parametrization of the onset of confinement in the vicinity of the phase transition. Lattice results of the energy density, the pressure and the interaction measure of pure SU(3) gauge theory are well reproduced. A relation between the thermal energy density of the Yang-Mills vacuum and the chromomagnetic condensate <B^2>_T is found. We also present the two flavour QCD equation of state for realistic quark masses and apply the model to dilepton production in ultrarelativistic heavy-ion collisions. |
hep-ph/0405086 | Pedro Bicudo | P. Bicudo | Prediction of the masses and decay processes of strange, charmed and
bottomed pentaquarks from the linear molecular crypto-heptaquark model | 8 pages, 1 figure, 5 tables. Submitted to Journal of Physics G | J.Phys.G32:787-798,2006 | 10.1088/0954-3899/32/6/004 | null | hep-ph | null | In this paper the masses and decay processes of several new strange, charmed
and bottomed exotic pentaquarks are predicted. Multiquarks are studied
microscopically in a standard quark model. In pure ground-state pentaquarks the
short-range interaction is computed and it is shown to be repulsive. The
long-range and medium-range interactions are not expected to provide sufficient
attraction. An additional quark-antiquark pair is then considered, and this is
suggested to produce a narrow linear molecular system. The quarks assemble in
three hadronic clusters, and the central hadron provides stability. The
possible crypto-heptaquark hadrons with exotic pentaquark flavours, with any
number of strange, charmed and bottomed quarks, are listed. Several new exotics
may still be observed.
| [
{
"created": "Mon, 10 May 2004 22:52:52 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2004 12:47:46 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2005 19:40:32 GMT",
"version": "v3"
}
] | 2011-01-27 | [
[
"Bicudo",
"P.",
""
]
] | In this paper the masses and decay processes of several new strange, charmed and bottomed exotic pentaquarks are predicted. Multiquarks are studied microscopically in a standard quark model. In pure ground-state pentaquarks the short-range interaction is computed and it is shown to be repulsive. The long-range and medium-range interactions are not expected to provide sufficient attraction. An additional quark-antiquark pair is then considered, and this is suggested to produce a narrow linear molecular system. The quarks assemble in three hadronic clusters, and the central hadron provides stability. The possible crypto-heptaquark hadrons with exotic pentaquark flavours, with any number of strange, charmed and bottomed quarks, are listed. Several new exotics may still be observed. |
1707.04138 | Alexei P. Martynenko | A.E. Dorokhov, N.I. Kochelev, A.P. Martynenko, F.A. Martynenko, A.E.
Radzhabov | The contribution of axial-vector mesons to hyperfine structure of muonic
hydrogen | 14 pages, 2 figures | Phys.Lett. B776 (2018) 105-110 | 10.1016/j.physletb.2017.11.027 | null | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contribution from the axial-vector meson exchange to the potential of the
muon-proton interaction in muonic hydrogen induced by anomalous axial-vector
meson coupling to two photon state is calculated. It is shown that such
contribution to the hyperfine splitting in muonic hydrogen is large and
important for a comparison with precise experimental data. In the light of our
result, the proton radius "puzzle" is discussed.
| [
{
"created": "Thu, 13 Jul 2017 14:15:48 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2017 18:23:14 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Nov 2017 19:58:43 GMT",
"version": "v3"
}
] | 2017-11-28 | [
[
"Dorokhov",
"A. E.",
""
],
[
"Kochelev",
"N. I.",
""
],
[
"Martynenko",
"A. P.",
""
],
[
"Martynenko",
"F. A.",
""
],
[
"Radzhabov",
"A. E.",
""
]
] | The contribution from the axial-vector meson exchange to the potential of the muon-proton interaction in muonic hydrogen induced by anomalous axial-vector meson coupling to two photon state is calculated. It is shown that such contribution to the hyperfine splitting in muonic hydrogen is large and important for a comparison with precise experimental data. In the light of our result, the proton radius "puzzle" is discussed. |
1603.02184 | Dr. Rukmani Mohanta | C Soumya, R. Mohanta | Implications of lepton flavour violation on long baseline neutrino
oscillation experiments | 21 pages, 10 figures, version to appear in Phys. Rev. D | Phys. Rev. D 94, 053008 (2016) | 10.1103/PhysRevD.94.053008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-standard neutrino interactions (NSIs), the sub-leading effects in the
flavour transitions of neutrinos, play a crucial role in the determination of
the various unknowns in neutrino oscillations, such as neutrino mass hierarchy,
Dirac CP violating phase and the octant of atmospheric mixing angle. In this
work, we focus on the possible implications of lepton flavour violating (LFV)
NSIs, which generally affect the neutrino propagation, on the determination of
the these unknown oscillation parameters. We study the effect of these NSIs on
the physics potential of the currently running and upcoming long-baseline
experiments, i.e., T2K, NO$\nu$A and DUNE. We also check the allowed
oscillation parameter space in presence of LFV NSIs.
| [
{
"created": "Mon, 7 Mar 2016 18:08:48 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Sep 2016 15:25:30 GMT",
"version": "v2"
}
] | 2016-09-28 | [
[
"Soumya",
"C",
""
],
[
"Mohanta",
"R.",
""
]
] | Non-standard neutrino interactions (NSIs), the sub-leading effects in the flavour transitions of neutrinos, play a crucial role in the determination of the various unknowns in neutrino oscillations, such as neutrino mass hierarchy, Dirac CP violating phase and the octant of atmospheric mixing angle. In this work, we focus on the possible implications of lepton flavour violating (LFV) NSIs, which generally affect the neutrino propagation, on the determination of the these unknown oscillation parameters. We study the effect of these NSIs on the physics potential of the currently running and upcoming long-baseline experiments, i.e., T2K, NO$\nu$A and DUNE. We also check the allowed oscillation parameter space in presence of LFV NSIs. |
hep-ph/0205263 | Sechul Oh | C. S. Kim, Jong-Phil Lee, and Sechul Oh | Nonleptonic two-body charmless B decays involving a tensor meson in
ISGW2 model | 23 pages, REVTEX; minor clarifications included; to appear in Phys.
Rev. D | Phys.Rev. D67 (2003) 014002 | 10.1103/PhysRevD.67.014002 | null | hep-ph | null | Nonleptonic charmless B decays into a pseudoscalar (P) or a vector (V) meson
accompanying a tensor (T) meson are re-analyzed. We scrutinize the hadronic
uncertainties and ambiguities of the form factors which appear in the
literature. The Isgur-Scora-Grinstein-Wise updated model (ISGW2) is adopted to
evaluate the relevant hadronic matrix elements. We calculate the branching
ratios and CP asymmetries for various $B\to P(V)T$ decay processes. With the
ISGW2 model, the branching ratios are enhanced by about an order of magnitude
compared to the previous estimates. We show that the ratios $\calB(B\to
VT)/\calB(B\to PT)$ for some strangeness-changing processes are very sensitive
to the CKM angle $\gamma$ ($\phi_3$).
| [
{
"created": "Thu, 23 May 2002 11:19:09 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2002 14:20:30 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kim",
"C. S.",
""
],
[
"Lee",
"Jong-Phil",
""
],
[
"Oh",
"Sechul",
""
]
] | Nonleptonic charmless B decays into a pseudoscalar (P) or a vector (V) meson accompanying a tensor (T) meson are re-analyzed. We scrutinize the hadronic uncertainties and ambiguities of the form factors which appear in the literature. The Isgur-Scora-Grinstein-Wise updated model (ISGW2) is adopted to evaluate the relevant hadronic matrix elements. We calculate the branching ratios and CP asymmetries for various $B\to P(V)T$ decay processes. With the ISGW2 model, the branching ratios are enhanced by about an order of magnitude compared to the previous estimates. We show that the ratios $\calB(B\to VT)/\calB(B\to PT)$ for some strangeness-changing processes are very sensitive to the CKM angle $\gamma$ ($\phi_3$). |
1806.06036 | Luc Darm\'e | Luc Darm\'e, Kamila Kowalska, Leszek Roszkowski, Enrico Maria Sessolo | Flavor anomalies and dark matter in SUSY with an extra U(1) | 38 pages, 8 figures, 4 tables. References added, matches published
version | JHEP 1810 (2018) 052 | 10.1007/JHEP10(2018)052 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent anomalies in $b\rightarrow s$ transitions that
emerged at LHCb, we consider a model with an $L_\mu - L_\tau$ gauge symmetry
and additional vector-like fermions. We find that by introducing supersymmetry
the model can be made consistent with the long-standing deviation in the
measured value of the anomalous magnetic moment of the muon, $g-2$, and
neutralino dark matter of broad mass ranges and properties. In particular, dark
matter candidates include the well-known 1 TeV higgsino, which in the MSSM is
typically not compatible with solutions to the $g-2$ puzzle. Moreover, its
spin-independent cross section could be at the origin of the recent small
excess in XENON-1T data. We apply to the model constraints arising from flavor
precision measurements and direct searches at the Large Hadron Collider and
show that they do not currently exclude the relevant parameter space regions.
| [
{
"created": "Fri, 15 Jun 2018 16:23:29 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2018 09:58:58 GMT",
"version": "v2"
}
] | 2018-10-16 | [
[
"Darmé",
"Luc",
""
],
[
"Kowalska",
"Kamila",
""
],
[
"Roszkowski",
"Leszek",
""
],
[
"Sessolo",
"Enrico Maria",
""
]
] | Motivated by the recent anomalies in $b\rightarrow s$ transitions that emerged at LHCb, we consider a model with an $L_\mu - L_\tau$ gauge symmetry and additional vector-like fermions. We find that by introducing supersymmetry the model can be made consistent with the long-standing deviation in the measured value of the anomalous magnetic moment of the muon, $g-2$, and neutralino dark matter of broad mass ranges and properties. In particular, dark matter candidates include the well-known 1 TeV higgsino, which in the MSSM is typically not compatible with solutions to the $g-2$ puzzle. Moreover, its spin-independent cross section could be at the origin of the recent small excess in XENON-1T data. We apply to the model constraints arising from flavor precision measurements and direct searches at the Large Hadron Collider and show that they do not currently exclude the relevant parameter space regions. |
hep-ph/0402205 | Vladimir Dzhunushaliev | V. Dzhunushaliev, D. Singleton and T. Nikulicheva | Nonperturbative calculational method in quantum field theory | one typo in eq. (5.51) is corrected | null | null | null | hep-ph hep-th | null | An approximate procedure for performing nonperturbative calculations in
quantum field theories is presented. The focus will be quantum non-Abelian
gauge theories with the goal of understanding some of the open questions of
these theories such as the confinement phenomenon and glueballs. One aspect of
this nonperturbative method is the breaking down of the non-Abelian gauge group
into smaller pieces. For example $SU(2) \to U(1) + coset$ or $SU(3) \to SU(2) +
coset$. The procedure also uses some aspects of an old method by Heisenberg to
calculate the n-point Green's function of a strongly interacting, non-linear
theory. Using these ideas we will give approximate calculations of the 2 and
4-points Green's function of the theories considered.
| [
{
"created": "Thu, 19 Feb 2004 03:02:41 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2004 07:20:39 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Feb 2005 06:30:10 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Dzhunushaliev",
"V.",
""
],
[
"Singleton",
"D.",
""
],
[
"Nikulicheva",
"T.",
""
]
] | An approximate procedure for performing nonperturbative calculations in quantum field theories is presented. The focus will be quantum non-Abelian gauge theories with the goal of understanding some of the open questions of these theories such as the confinement phenomenon and glueballs. One aspect of this nonperturbative method is the breaking down of the non-Abelian gauge group into smaller pieces. For example $SU(2) \to U(1) + coset$ or $SU(3) \to SU(2) + coset$. The procedure also uses some aspects of an old method by Heisenberg to calculate the n-point Green's function of a strongly interacting, non-linear theory. Using these ideas we will give approximate calculations of the 2 and 4-points Green's function of the theories considered. |
1312.0304 | Farinaldo Queiroz | D. Cogollo, Farinaldo S. Queiroz, P. Vasconcelos | Flavor Changing Neutral Current Processes in a Reduced Minimal Scalar
Sector | 21 pages, 2 figures, 2 tables. Matches version accepted for
publication | null | 10.1142/S0217732314501739 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we overhaul previous studies of Flavor Changing Neutral Current
processes in the context of the Reduced Minimal 3-3-1 model(RM331). We sift the
individual contributions from the CP even scalars and the $Z^{\prime}$ gauge
boson using two different parametrizations schemes and compare our results with
current measurements. In particular, studying the $B^{0}-\bar{B^{0}}$ meson
system we find the most stringent bounds in the literature on this model,
namely $M_{Z^{\prime}} \gtrsim 3326$~GeV, $M_{V^{\pm}} \gtrsim 910$~GeV,
$M_{U^{++}} \gtrsim 914$~GeV and $m_{h_2^0} \gtrsim 889$~GeV.
| [
{
"created": "Mon, 2 Dec 2013 02:06:51 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 22:21:42 GMT",
"version": "v2"
},
{
"created": "Mon, 26 May 2014 02:46:02 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Aug 2014 18:16:59 GMT",
"version": "v4"
}
] | 2015-06-18 | [
[
"Cogollo",
"D.",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Vasconcelos",
"P.",
""
]
] | In this work we overhaul previous studies of Flavor Changing Neutral Current processes in the context of the Reduced Minimal 3-3-1 model(RM331). We sift the individual contributions from the CP even scalars and the $Z^{\prime}$ gauge boson using two different parametrizations schemes and compare our results with current measurements. In particular, studying the $B^{0}-\bar{B^{0}}$ meson system we find the most stringent bounds in the literature on this model, namely $M_{Z^{\prime}} \gtrsim 3326$~GeV, $M_{V^{\pm}} \gtrsim 910$~GeV, $M_{U^{++}} \gtrsim 914$~GeV and $m_{h_2^0} \gtrsim 889$~GeV. |
1709.01647 | Yufei Wang | Yu-Fei Wang | Unitarity Analyses of $\pi N$ Elastic Scattering Amplitudes | 4 pages, 2 figures (the first figure contains 6 sub-figures), from
proceedings of the 11th APCTP - BLTP JINR - PNPI NRC KI - SPbU Joint Workshop
(held in Saint-Petersburg in July 23-28th) | null | 10.1134/S1547477118040234 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pion - nucleon scattering phase shifts in $s$ and $p$ waves are analyzed
using PKU unitarization approach that can separate the phase shifts into
different contributions from poles and branch cuts. It is found that in
$S_{11}$ and $P_{11}$ channels, there exist large and positive missing
contributions when one compares the phase shift from known resonances plus
branch cuts with the experimental data, which indicates that those two channels
may contain sizable effects from $N^*(1535)$ and $N^*(1440)$ shadow poles.
Those results are obtained using tree level results of the $\pi N$ amplitude.
| [
{
"created": "Wed, 6 Sep 2017 01:34:47 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2017 01:48:55 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Wang",
"Yu-Fei",
""
]
] | The pion - nucleon scattering phase shifts in $s$ and $p$ waves are analyzed using PKU unitarization approach that can separate the phase shifts into different contributions from poles and branch cuts. It is found that in $S_{11}$ and $P_{11}$ channels, there exist large and positive missing contributions when one compares the phase shift from known resonances plus branch cuts with the experimental data, which indicates that those two channels may contain sizable effects from $N^*(1535)$ and $N^*(1440)$ shadow poles. Those results are obtained using tree level results of the $\pi N$ amplitude. |
1601.07339 | Takaaki Nomura | Takaaki Nomura, Hiroshi Okada | Generalized Zee-Babu model with 750 GeV Diphoton Resonance | 21 pages, 3 figures, 1 table. published version | null | 10.1016/j.physletb.2016.03.034 | KIAS-P16011 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a generalized Zee-Babu model with a global $U(1)$ B-L symmetry, in
which we classify the model in terms of the number of the hypercharge $N/2$ of
the isospin doublet exotic charged fermions. Corresponding to each of the
number of $N$, we need to introduce some multiply charged bosons in order to
make the exotic fields decay into the standard model fields. We also discuss
the muon anomalous magnetic moment and the diphoton excess depending on $N$,
and we show what kind of models are in favor of these phenomenologies.
| [
{
"created": "Wed, 27 Jan 2016 12:14:25 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2016 14:36:19 GMT",
"version": "v2"
}
] | 2016-05-20 | [
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
]
] | We propose a generalized Zee-Babu model with a global $U(1)$ B-L symmetry, in which we classify the model in terms of the number of the hypercharge $N/2$ of the isospin doublet exotic charged fermions. Corresponding to each of the number of $N$, we need to introduce some multiply charged bosons in order to make the exotic fields decay into the standard model fields. We also discuss the muon anomalous magnetic moment and the diphoton excess depending on $N$, and we show what kind of models are in favor of these phenomenologies. |
hep-ph/0206036 | Andrej Arbuzov | Andrej Arbuzov | Higher order QED corrections to muon decay spectrum | version submitted to JHEP | JHEP 0303 (2003) 063 | 10.1088/1126-6708/2003/03/063 | Alberta-Thy-10-02 | hep-ph | null | QED radiative corrections to polarized muon decay spectrum are considered.
Leading and next--to--leading logarithmic approximations are used.
Exponentiation of soft radiation is discussed. The present theoretical
uncertainty of the spectrum description is estimated.
| [
{
"created": "Tue, 4 Jun 2002 17:38:07 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Apr 2003 05:34:12 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Arbuzov",
"Andrej",
""
]
] | QED radiative corrections to polarized muon decay spectrum are considered. Leading and next--to--leading logarithmic approximations are used. Exponentiation of soft radiation is discussed. The present theoretical uncertainty of the spectrum description is estimated. |
1812.05617 | Martin Hoferichter | Martin Hoferichter, Philipp Klos, Javier Men\'endez, Achim Schwenk | Nuclear structure factors for general spin-independent WIMP-nucleus
scattering | 24 pages, 19 figures, Python notebook available at
https://theorie.ikp.physik.tu-darmstadt.de/strongint/ChiralEFT4DM.html;
further details on nuclear structure added, journal version | Phys. Rev. D 99, 055031 (2019) | 10.1103/PhysRevD.99.055031 | INT-PUB-18-059 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present nuclear structure factors that describe the generalized
spin-independent coupling of weakly interacting massive particles (WIMPs) to
nuclei. Our results are based on state-of-the-art nuclear structure
calculations using the large-scale nuclear shell model. Starting from quark-
and gluon-level operators, we consider all possible coherently enhanced
couplings of spin-1/2 and spin-0 WIMPs to one and two nucleons up to third
order in chiral effective field theory. This includes a comprehensive
discussion of the structure factors corresponding to the leading two-nucleon
currents covering, for the first time, the contribution of spin-2 operators. We
provide results for the most relevant nuclear targets considered in present and
planned dark matter direct detection experiments: fluorine, silicon, argon, and
germanium, complementing our previous work on xenon. All results are also
publicly available in a Python notebook.
| [
{
"created": "Thu, 13 Dec 2018 19:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2019 15:19:39 GMT",
"version": "v2"
}
] | 2019-04-01 | [
[
"Hoferichter",
"Martin",
""
],
[
"Klos",
"Philipp",
""
],
[
"Menéndez",
"Javier",
""
],
[
"Schwenk",
"Achim",
""
]
] | We present nuclear structure factors that describe the generalized spin-independent coupling of weakly interacting massive particles (WIMPs) to nuclei. Our results are based on state-of-the-art nuclear structure calculations using the large-scale nuclear shell model. Starting from quark- and gluon-level operators, we consider all possible coherently enhanced couplings of spin-1/2 and spin-0 WIMPs to one and two nucleons up to third order in chiral effective field theory. This includes a comprehensive discussion of the structure factors corresponding to the leading two-nucleon currents covering, for the first time, the contribution of spin-2 operators. We provide results for the most relevant nuclear targets considered in present and planned dark matter direct detection experiments: fluorine, silicon, argon, and germanium, complementing our previous work on xenon. All results are also publicly available in a Python notebook. |
hep-ph/9812278 | Kaustubh Agashe | K. Agashe and N.G. Deshpande (ITS, University of Oregon) | Determining the Weak Phase $\gamma$ in the Presence of Rescattering | LaTeX file, 15 pages including 2 figures. Replacing an earlier
version. In version 4, we have corrected some typographic errors. We have
also clarified which decay modes require external tagging and have
changed/added some comments | Phys.Lett. B451 (1999) 215-223 | 10.1016/S0370-2693(99)00159-8 | OITS-667 | hep-ph | null | We suggest a new technique to determine the CKM phase $\gamma$ {\em without}
neglecting the (soft) final state rescattering effects. We use (time
integrated) $B$ meson decay rates to $\pi$'s and $K$'s. A set of 5 $\Delta S =
0$ (or 1 $\Delta S =0$ and 4 $\Delta S= 1$) decay rates is used to compute the
strong phases and magnitudes of the tree level and penguin contributions as
functions of $\gamma$. These are used to {\em predict} a $\Delta S = 1$
$(\Delta S = 0) B_{d/s}$ decay rate as a function of $\gamma$ (using SU(3)
symmetry). The measurement of this decay rate then gives $\gamma$. We
illustrate this technique using different cases. Most of the decay modes we use
are expected to be accessible at the B-factories (e^+ e^- or hadron machines).
| [
{
"created": "Tue, 8 Dec 1998 00:24:04 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 1998 00:38:03 GMT",
"version": "v2"
},
{
"created": "Sat, 19 Dec 1998 01:34:22 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Jan 1999 23:34:50 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Agashe",
"K.",
"",
"ITS, University of Oregon"
],
[
"Deshpande",
"N. G.",
"",
"ITS, University of Oregon"
]
] | We suggest a new technique to determine the CKM phase $\gamma$ {\em without} neglecting the (soft) final state rescattering effects. We use (time integrated) $B$ meson decay rates to $\pi$'s and $K$'s. A set of 5 $\Delta S = 0$ (or 1 $\Delta S =0$ and 4 $\Delta S= 1$) decay rates is used to compute the strong phases and magnitudes of the tree level and penguin contributions as functions of $\gamma$. These are used to {\em predict} a $\Delta S = 1$ $(\Delta S = 0) B_{d/s}$ decay rate as a function of $\gamma$ (using SU(3) symmetry). The measurement of this decay rate then gives $\gamma$. We illustrate this technique using different cases. Most of the decay modes we use are expected to be accessible at the B-factories (e^+ e^- or hadron machines). |
1508.07161 | Kari Rummukainen | Michela D'Onofrio (1 and 2), Kari Rummukainen (2) ((1) University of
Bern, (2) University of Helsinki) | The Standard Model cross-over on the lattice | 10 pages | Phys. Rev. D 93, 025003 (2016) | 10.1103/PhysRevD.93.025003 | HIP-2015-30/TH | hep-ph astro-ph.CO hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the physical Higgs mass the Standard Model symmetry restoration phase
transition is a smooth cross-over. We study the thermodynamics of the
cross-over using numerical lattice Monte Carlo simulations of an effective
SU(2) X U(1) gauge + Higgs theory, significantly improving on previously
published results. We measure the Higgs field expectation value, thermodynamic
quantities like pressure, energy density, speed of sound and heat capacity, and
screening masses associated with the Higgs and Z fields. While the cross-over
is smooth, it is very well defined with a width of only approximately 5 GeV. We
measure the cross-over temperature from the maximum of the susceptibility of
the Higgs condensate, with the result $T_c = 159.5 \pm 1.5$ GeV. Outside of the
narrow cross-over region the perturbative results agree well with
non-perturbative ones.
| [
{
"created": "Fri, 28 Aug 2015 10:42:18 GMT",
"version": "v1"
}
] | 2016-01-13 | [
[
"D'Onofrio",
"Michela",
"",
"1 and 2"
],
[
"Rummukainen",
"Kari",
""
]
] | With the physical Higgs mass the Standard Model symmetry restoration phase transition is a smooth cross-over. We study the thermodynamics of the cross-over using numerical lattice Monte Carlo simulations of an effective SU(2) X U(1) gauge + Higgs theory, significantly improving on previously published results. We measure the Higgs field expectation value, thermodynamic quantities like pressure, energy density, speed of sound and heat capacity, and screening masses associated with the Higgs and Z fields. While the cross-over is smooth, it is very well defined with a width of only approximately 5 GeV. We measure the cross-over temperature from the maximum of the susceptibility of the Higgs condensate, with the result $T_c = 159.5 \pm 1.5$ GeV. Outside of the narrow cross-over region the perturbative results agree well with non-perturbative ones. |
2303.10562 | Jing-Yu Zhu | Federica Pompa, Thomas Schwetz and Jing-Yu Zhu | Impact of nuclear matrix element calculations for current and future
neutrinoless double beta decay searches | 29 pages, 14 figures, the version to be published in JHEP | null | 10.1007/JHEP06(2023)104 | null | hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Nuclear matrix elements (NME) are a crucial input for the interpretation of
neutrinoless double beta decay data. We consider a representative set of recent
NME calculations from different methods and investigate the impact on the
present bound on the effective Majorana mass $m_{\beta\beta}$ by performing a
combined analysis of the available data as well as on the sensitivity reach of
future projects. A crucial role is played by the recently discovered
short-range contribution to the NME, induced by light Majorana neutrino masses.
Depending on the NME model and the relative sign of the long- and short-range
contributions, the current $3\sigma$ bound can change between $m_{\beta\beta} <
40$ meV and 600 meV. The sign-uncertainty may either boost the sensitivity of
next-generation experiments beyond the region for $m_{\beta\beta}$ predicted
for inverted mass ordering or prevent even advanced setups to reach this
region. Furthermore, we study the possibility to distinguish between different
NME calculations by assuming a positive signal and by combining measurements
from different isotopes. Such a discrimination will be impossible if the
relative sign of the long- and short-range contribution remains unknown, but
can become feasible if $m_{\beta\beta} \gtrsim 40$ meV and if the relative sign
is known to be positive. Sensitivities will be dominated by the advanced
$^{76}$Ge and $^{136}$Xe setups assumed here, but NME model-discrimination
improves if data from a third isotope is added, e.g., from $^{130}$Te or
$^{100}$Mo.
| [
{
"created": "Sun, 19 Mar 2023 04:38:47 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jun 2023 07:11:34 GMT",
"version": "v2"
}
] | 2023-07-05 | [
[
"Pompa",
"Federica",
""
],
[
"Schwetz",
"Thomas",
""
],
[
"Zhu",
"Jing-Yu",
""
]
] | Nuclear matrix elements (NME) are a crucial input for the interpretation of neutrinoless double beta decay data. We consider a representative set of recent NME calculations from different methods and investigate the impact on the present bound on the effective Majorana mass $m_{\beta\beta}$ by performing a combined analysis of the available data as well as on the sensitivity reach of future projects. A crucial role is played by the recently discovered short-range contribution to the NME, induced by light Majorana neutrino masses. Depending on the NME model and the relative sign of the long- and short-range contributions, the current $3\sigma$ bound can change between $m_{\beta\beta} < 40$ meV and 600 meV. The sign-uncertainty may either boost the sensitivity of next-generation experiments beyond the region for $m_{\beta\beta}$ predicted for inverted mass ordering or prevent even advanced setups to reach this region. Furthermore, we study the possibility to distinguish between different NME calculations by assuming a positive signal and by combining measurements from different isotopes. Such a discrimination will be impossible if the relative sign of the long- and short-range contribution remains unknown, but can become feasible if $m_{\beta\beta} \gtrsim 40$ meV and if the relative sign is known to be positive. Sensitivities will be dominated by the advanced $^{76}$Ge and $^{136}$Xe setups assumed here, but NME model-discrimination improves if data from a third isotope is added, e.g., from $^{130}$Te or $^{100}$Mo. |
1112.5115 | Daniel Almeida Fagundes | D. A. Fagundes, M. J. Menon | Total Hadronic Cross Section and the Elastic Slope: An Almost
Model-Independent Connection | 15 pages, 4 figures, v4: few typos corrected, final version to be
published in Nucl. Phys. A | null | 10.1016/j.nuclphysa.2012.01.017 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An almost model-independent parametrization for the ratio of the total cross
section to the elastic slope, as function of the center of mass energy, is
introduced. The analytical result is based on the approximate relation of this
quantity with the ratio $R$ of the elastic to total cross section and empirical
fits to the $R$ data from proton-proton scattering above 10 GeV, under the
conditions of asymptotic unitarity and the black-disk limit. This
parametrization may be useful in studies of extensive air showers and the
determination of the proton-proton total cross section from proton-air
production cross section in cosmic-ray experiments.
| [
{
"created": "Wed, 21 Dec 2011 18:08:31 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2012 13:13:50 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Feb 2012 13:15:39 GMT",
"version": "v3"
}
] | 2012-02-02 | [
[
"Fagundes",
"D. A.",
""
],
[
"Menon",
"M. J.",
""
]
] | An almost model-independent parametrization for the ratio of the total cross section to the elastic slope, as function of the center of mass energy, is introduced. The analytical result is based on the approximate relation of this quantity with the ratio $R$ of the elastic to total cross section and empirical fits to the $R$ data from proton-proton scattering above 10 GeV, under the conditions of asymptotic unitarity and the black-disk limit. This parametrization may be useful in studies of extensive air showers and the determination of the proton-proton total cross section from proton-air production cross section in cosmic-ray experiments. |
hep-ph/9406362 | Dam Thanh Son | V. A. Rubakov and D. T. Son | Renormalization Group for Multiparticle Production in (2+1) Dimensions
Around the Threshold | based on talk at International Seminar Quarks-94, 11-18 May 1994,
Vladimir, Russia, REVTEX 3.0, 13pp, 3 figures included (use bezier.sty) | null | null | null | hep-ph | null | Multiparticle production in (2+1) dimensions is investigated. We show that in
a small region around the threshold the perturbation theory becomes
unapplicable due to infrared divergencies in a class of Feynman graphs with
rescattering in final state. We develop a technique based on renormalization
group for summing up leading logarithms and apply it to the $\phi^4$ models
with and without symmetry breaking and to the $O(N)$ $\phi^4$ theory.
| [
{
"created": "Wed, 22 Jun 1994 13:02:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rubakov",
"V. A.",
""
],
[
"Son",
"D. T.",
""
]
] | Multiparticle production in (2+1) dimensions is investigated. We show that in a small region around the threshold the perturbation theory becomes unapplicable due to infrared divergencies in a class of Feynman graphs with rescattering in final state. We develop a technique based on renormalization group for summing up leading logarithms and apply it to the $\phi^4$ models with and without symmetry breaking and to the $O(N)$ $\phi^4$ theory. |
2012.10727 | Daniel Boyanovsky | Mudit Rai, Daniel Boyanovsky | Interaction rates in cosmology: heavy particle production and scattering | more discussions | Class. Quantum Grav. 38 195014 (2021) | 10.1088/1361-6382/ac1b47 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study transition rates and cross sections from first principles in a
spatially flat radiation dominated cosmology. We consider a model of scalar
particles to study scattering and heavy particle production from pair
annihilation, drawing more general conclusions. The S-matrix formulation is ill
suited to study these ubiquitous processes in a rapidly expanding cosmology. We
introduce a physically motivated adiabatic expansion that relies on wavelengths
much smaller than the particle horizon at a given time. The leading order in
this expansion dominates the transition rates and cross sections. Several
important and general results are direct consequences of the cosmological
redshift and a finite particle horizon: i) a violation of local Lorentz
invariance, ii) freeze-out of the production cross section at a finite time,
iii) sub-threshold production of heavier particles as a consequence of the
uncertainty in the local energy from a finite particle horizon, a manifestation
of the \emph{antizeno} effect. If heavy dark matter is produced via
annihilation of a lighter species, sub-threshold production yields an enhanced
abundance. We discuss several possible consequences of these effects.
| [
{
"created": "Sat, 19 Dec 2020 16:11:17 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2021 22:43:13 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Sep 2021 11:19:59 GMT",
"version": "v3"
}
] | 2021-09-03 | [
[
"Rai",
"Mudit",
""
],
[
"Boyanovsky",
"Daniel",
""
]
] | We study transition rates and cross sections from first principles in a spatially flat radiation dominated cosmology. We consider a model of scalar particles to study scattering and heavy particle production from pair annihilation, drawing more general conclusions. The S-matrix formulation is ill suited to study these ubiquitous processes in a rapidly expanding cosmology. We introduce a physically motivated adiabatic expansion that relies on wavelengths much smaller than the particle horizon at a given time. The leading order in this expansion dominates the transition rates and cross sections. Several important and general results are direct consequences of the cosmological redshift and a finite particle horizon: i) a violation of local Lorentz invariance, ii) freeze-out of the production cross section at a finite time, iii) sub-threshold production of heavier particles as a consequence of the uncertainty in the local energy from a finite particle horizon, a manifestation of the \emph{antizeno} effect. If heavy dark matter is produced via annihilation of a lighter species, sub-threshold production yields an enhanced abundance. We discuss several possible consequences of these effects. |
2312.04953 | Xuan Luo | Xuan Luo, Ruitian Li, Hao Sun | Theoretical study of the $B^+\to D^-D_s^{+}\pi^+$ reaction | 8 pages, 7 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Prompted by the recent discoveries of $T_{c\bar{s}0}(2900)^{++}$ in the
$D_s^+\pi^+$ invariant mass distribution of $B^+\to D^-D_s^+\pi^+$ process, we
present a model that hopes to help us investigate the nature of
$T_{c\bar{s}0}(2900)^{++}$ by reproducing the mass distribution of $D^-\pi^+,
D_s^+\pi^+$ and $D^-D_s^+$ in $B^+ \to D^-D_s^+\pi^+$ decays. The structure of
the triangular singularity peak generated from the $\chi_{c1}D^{*+}K^{*+}$ loop
near the $D^{*+}K^{*+}$ threshold is considered in our model may be the
experimentally discovered resonance-like state structure
$T_{c\bar{s}0}(2900)^{++}$. In addition, we employ a coupled-channel approach
to describe the dominant contribution of the $D\pi$ $S\text{-wave}$ amplitude,
and also consider other excitations. Our model provides a well fit to the
invariant mass distributions of $D^-\pi^+, D_s^+\pi^+$ and $D^-D_s^+$
simultaneously.
| [
{
"created": "Fri, 8 Dec 2023 10:32:08 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2024 12:30:31 GMT",
"version": "v2"
}
] | 2024-01-09 | [
[
"Luo",
"Xuan",
""
],
[
"Li",
"Ruitian",
""
],
[
"Sun",
"Hao",
""
]
] | Prompted by the recent discoveries of $T_{c\bar{s}0}(2900)^{++}$ in the $D_s^+\pi^+$ invariant mass distribution of $B^+\to D^-D_s^+\pi^+$ process, we present a model that hopes to help us investigate the nature of $T_{c\bar{s}0}(2900)^{++}$ by reproducing the mass distribution of $D^-\pi^+, D_s^+\pi^+$ and $D^-D_s^+$ in $B^+ \to D^-D_s^+\pi^+$ decays. The structure of the triangular singularity peak generated from the $\chi_{c1}D^{*+}K^{*+}$ loop near the $D^{*+}K^{*+}$ threshold is considered in our model may be the experimentally discovered resonance-like state structure $T_{c\bar{s}0}(2900)^{++}$. In addition, we employ a coupled-channel approach to describe the dominant contribution of the $D\pi$ $S\text{-wave}$ amplitude, and also consider other excitations. Our model provides a well fit to the invariant mass distributions of $D^-\pi^+, D_s^+\pi^+$ and $D^-D_s^+$ simultaneously. |
1511.00865 | Toshifumi Yamada | Cheng-Wei Chiang, An-Li Kuo, Toshifumi Yamada | Searches of exotic Higgs bosons in general mass spectra of the
Georgi-Machacek model at the LHC | Version accepted for publication in JHEP | null | 10.1007/JHEP01(2016)120 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the most general sets of viable mass spectra of the exotic Higgs
bosons in the Georgi-Machacek model that are consistent with the theoretical
constraints of vacuum stability and perturbative unitarity and the experimental
constraints of electroweak precision observables, $Zb \bar b$ coupling and
Higgs boson signal strengths. Branching ratios of various cascade decay
channels of the doubly-charged Higgs boson in the ${\bf 5}$ representation, the
singly-charged Higgs boson in ${\bf 3}$, and the singlet Higgs boson are
further computed. As one of the most promising channels for discovering the
model, we study the prospects for detecting the doubly-charged Higgs boson that
is produced via the vector boson fusion process and decays into final states
containing a pair of same-sign leptons at the 14-TeV LHC and a 100-TeV future
$pp$ collider. For this purpose, we evaluate acceptance times efficiency for
signals of the doubly-charged Higgs boson with general viable mass spectra and
compare it with the standard model background estimates.
| [
{
"created": "Tue, 3 Nov 2015 11:49:03 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Nov 2015 16:44:45 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jan 2016 16:34:09 GMT",
"version": "v3"
}
] | 2016-02-17 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Kuo",
"An-Li",
""
],
[
"Yamada",
"Toshifumi",
""
]
] | We derive the most general sets of viable mass spectra of the exotic Higgs bosons in the Georgi-Machacek model that are consistent with the theoretical constraints of vacuum stability and perturbative unitarity and the experimental constraints of electroweak precision observables, $Zb \bar b$ coupling and Higgs boson signal strengths. Branching ratios of various cascade decay channels of the doubly-charged Higgs boson in the ${\bf 5}$ representation, the singly-charged Higgs boson in ${\bf 3}$, and the singlet Higgs boson are further computed. As one of the most promising channels for discovering the model, we study the prospects for detecting the doubly-charged Higgs boson that is produced via the vector boson fusion process and decays into final states containing a pair of same-sign leptons at the 14-TeV LHC and a 100-TeV future $pp$ collider. For this purpose, we evaluate acceptance times efficiency for signals of the doubly-charged Higgs boson with general viable mass spectra and compare it with the standard model background estimates. |
1112.6304 | Pedro Fernando Simoes Costa | M. C. Ruivo, M. Santos, Pedro Costa, C. A. de Sousa | Interplay between chiral and axial symmetries in a SU(2)
Nambu--Jona-Lasinio Model with the Polyakov loop | 21 pages, 5 figures; PRD version | Phys.Rev. D85 (2012) 036001 | 10.1103/PhysRevD.85.036001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a two flavor Polyakov--Nambu--Jona-Lasinio (PNJL) model where the
Lagrangian includes an interaction term that explicitly breaks the U$_A(1)$
anomaly. At finite temperature, the restoration of chiral and axial symmetries,
signaled by the behavior of several observables, is investigated. We compare
the effects of two regularizations at finite temperature, one of them, that
allows high momentum quarks states, leading to the full recovery of chiral
symmetry. From the analysis of the behavior of the topological susceptibility
and of the mesonic masses of the axial partners, it is found in the SU(2) model
that, unlike the SU(3) results, the recovery of the axial symmetry is not a
consequence of the full recovery of the chiral symmetry. Thus, one needs to use
an additional idea, by means of a temperature dependence of the anomaly
coefficient, that simulates instanton suppression effects.
| [
{
"created": "Thu, 29 Dec 2011 13:26:34 GMT",
"version": "v1"
}
] | 2012-02-21 | [
[
"Ruivo",
"M. C.",
""
],
[
"Santos",
"M.",
""
],
[
"Costa",
"Pedro",
""
],
[
"de Sousa",
"C. A.",
""
]
] | We consider a two flavor Polyakov--Nambu--Jona-Lasinio (PNJL) model where the Lagrangian includes an interaction term that explicitly breaks the U$_A(1)$ anomaly. At finite temperature, the restoration of chiral and axial symmetries, signaled by the behavior of several observables, is investigated. We compare the effects of two regularizations at finite temperature, one of them, that allows high momentum quarks states, leading to the full recovery of chiral symmetry. From the analysis of the behavior of the topological susceptibility and of the mesonic masses of the axial partners, it is found in the SU(2) model that, unlike the SU(3) results, the recovery of the axial symmetry is not a consequence of the full recovery of the chiral symmetry. Thus, one needs to use an additional idea, by means of a temperature dependence of the anomaly coefficient, that simulates instanton suppression effects. |
0710.1869 | Gilad Perez | A. Liam Fitzpatrick, Gilad Perez and Lisa Randall | Flavor from Minimal Flavor Violation & a Viable Randall-Sundrum Model | 5 pages | Phys.Rev.Lett.100:171604,2008 | 10.1103/PhysRevLett.100.171604 | null | hep-ph | null | We present a variant of the warped extra dimension, Randall-Sundrum (RS),
framework which is based on five dimensional (5D) minimal flavor violation
(MFV), in which the only sources of flavor breaking are two 5D anarchic Yukawa
matrices. The Yukawa matrices also control the bulk masses, which are
responsible for the resulting flavor structure and mass hierarchy in the low
energy theory. An interesting result of this set-up is that at low energies the
theory flows to next to MFV model where flavor violation is dominantly coming
from the third generation. Low energy flavor violation is further suppressed by
a single parameter that dials the amount of violation in the up or down sector.
There is therefore a sharp limit in which there is no flavor violation in the
down type quark sector which, remarkably, is favored when we fit for the flavor
parameters. This mechanism is used to eliminate the current RS flavor and CP
problem even with a Kaluza-Klein scale as low as 2 TeV! Our construction also
suggests that economic supersymmetric and non-supersymmetric, strong
dynamic-based, flavor models may be built based on the same concepts.
| [
{
"created": "Wed, 10 Oct 2007 14:22:25 GMT",
"version": "v1"
}
] | 2009-08-12 | [
[
"Fitzpatrick",
"A. Liam",
""
],
[
"Perez",
"Gilad",
""
],
[
"Randall",
"Lisa",
""
]
] | We present a variant of the warped extra dimension, Randall-Sundrum (RS), framework which is based on five dimensional (5D) minimal flavor violation (MFV), in which the only sources of flavor breaking are two 5D anarchic Yukawa matrices. The Yukawa matrices also control the bulk masses, which are responsible for the resulting flavor structure and mass hierarchy in the low energy theory. An interesting result of this set-up is that at low energies the theory flows to next to MFV model where flavor violation is dominantly coming from the third generation. Low energy flavor violation is further suppressed by a single parameter that dials the amount of violation in the up or down sector. There is therefore a sharp limit in which there is no flavor violation in the down type quark sector which, remarkably, is favored when we fit for the flavor parameters. This mechanism is used to eliminate the current RS flavor and CP problem even with a Kaluza-Klein scale as low as 2 TeV! Our construction also suggests that economic supersymmetric and non-supersymmetric, strong dynamic-based, flavor models may be built based on the same concepts. |
1710.09231 | Christoph Gnendiger | C. Gnendiger, A. Signer | $\gamma_{5}$ in FDH | 28 pages, 7 figures | Phys. Rev. D 97, 096006 (2018) | 10.1103/PhysRevD.97.096006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the regularization-scheme dependent treatment of $\gamma_{5}$
in the framework of dimensional regularization, mainly focusing on the
four-dimensional helicity scheme (FDH). Evaluating distinctive examples, we
find that for one-loop calculations, the recently proposed four-dimensional
formulation (FDF) of the FDH scheme constitutes a viable and efficient
alternative compared to more traditional approaches. In addition, we extend the
considerations to the two-loop level and compute the pseudo-scalar form factors
of quarks and gluons in FDH. We provide the necessary operator renormalization
and discuss at a practical level how the complexity of intermediate
calculational steps can be reduced in an efficient way.
| [
{
"created": "Wed, 25 Oct 2017 13:43:00 GMT",
"version": "v1"
}
] | 2018-05-16 | [
[
"Gnendiger",
"C.",
""
],
[
"Signer",
"A.",
""
]
] | We investigate the regularization-scheme dependent treatment of $\gamma_{5}$ in the framework of dimensional regularization, mainly focusing on the four-dimensional helicity scheme (FDH). Evaluating distinctive examples, we find that for one-loop calculations, the recently proposed four-dimensional formulation (FDF) of the FDH scheme constitutes a viable and efficient alternative compared to more traditional approaches. In addition, we extend the considerations to the two-loop level and compute the pseudo-scalar form factors of quarks and gluons in FDH. We provide the necessary operator renormalization and discuss at a practical level how the complexity of intermediate calculational steps can be reduced in an efficient way. |
0809.3064 | Yuji Omura | Tatsuo Kobayashi, Yuji Omura, Koichi Yoshioka | Flavor Symmetry Breaking and Vacuum Alignment on Orbifolds | 21 pages | Phys.Rev.D78:115006,2008 | 10.1103/PhysRevD.78.115006 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor symmetry has been widely studied for figuring out the masses and
mixing angles of standard-model fermions. In this paper we present a framework
for handling flavor symmetry breaking where the symmetry breaking is triggered
by boundary conditions of scalar fields in extra-dimensional space. The
alignment of scalar expectation values is achieved without referring to any
details of scalar potential and its minimization procedure. As applications to
non-abelian discrete flavor symmetries, illustrative lepton mass models are
constructed where the S3 and A4 flavor symmetries are broken down to the
directions leading to the tri-bimaximal form of lepton mixing and realistic
mass patterns.
| [
{
"created": "Thu, 18 Sep 2008 05:11:01 GMT",
"version": "v1"
}
] | 2008-12-30 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Omura",
"Yuji",
""
],
[
"Yoshioka",
"Koichi",
""
]
] | Flavor symmetry has been widely studied for figuring out the masses and mixing angles of standard-model fermions. In this paper we present a framework for handling flavor symmetry breaking where the symmetry breaking is triggered by boundary conditions of scalar fields in extra-dimensional space. The alignment of scalar expectation values is achieved without referring to any details of scalar potential and its minimization procedure. As applications to non-abelian discrete flavor symmetries, illustrative lepton mass models are constructed where the S3 and A4 flavor symmetries are broken down to the directions leading to the tri-bimaximal form of lepton mixing and realistic mass patterns. |
2207.10788 | Adam Freese | Adam Freese and Wim Cosyn | Spatial densities of the photon on the light front | 20 pages, 5 figures | null | 10.1103/PhysRevD.106.114014 | NT@UW-2207 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The light front densities of momentum, angular momentum, and intrinsic
pressure are calculated for the photon, both in the free case and at leading
order in quantum electrodynamics. In the latter case, we moreover decompose the
form factors into photon and electron contributions. Circularly and linearly
polarized photons are both considered, with the latter containing significant
azimuthal modulations in both the momentum density and in intrinsic stresses.
We find that the D-term of the photon is positive instead of negative, and
accordingly the intrinsic radial pressure of the photon is negative. Despite
this, the radiation pressure exerted by the photon is positive. We illustrate
through explicit calculation how the intrinsic pressure associated with the
D-term and the radiation pressure exerted by the photon are different
quantities.
| [
{
"created": "Thu, 21 Jul 2022 23:40:01 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2022 05:18:59 GMT",
"version": "v2"
}
] | 2022-12-28 | [
[
"Freese",
"Adam",
""
],
[
"Cosyn",
"Wim",
""
]
] | The light front densities of momentum, angular momentum, and intrinsic pressure are calculated for the photon, both in the free case and at leading order in quantum electrodynamics. In the latter case, we moreover decompose the form factors into photon and electron contributions. Circularly and linearly polarized photons are both considered, with the latter containing significant azimuthal modulations in both the momentum density and in intrinsic stresses. We find that the D-term of the photon is positive instead of negative, and accordingly the intrinsic radial pressure of the photon is negative. Despite this, the radiation pressure exerted by the photon is positive. We illustrate through explicit calculation how the intrinsic pressure associated with the D-term and the radiation pressure exerted by the photon are different quantities. |
2012.13499 | Jun Jiang | Eric Braaten, Li-Ping He, Kevin Ingles, and Jun Jiang | Production of $X(3872)$ at High Multiplicity | 6 pages, 3 figures | Phys. Rev. D 103, 071901 (2021) | 10.1103/PhysRevD.103.L071901 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The dependence of the production of the $X(3872)$ meson on the hadron
multiplicity in $pp$ collisions has been used as evidence against $X$ being a
charm-meson molecule. The argument is based in part on the incorrect assumption
that the cross section for the breakup of $X$ by scattering with comovers can
be approximated by a geometric cross section inversely proportional to the
binding energy of $X$. The breakup cross section should instead be approximated
by the probability-weighted sum of the cross sections for the scattering of
comoving pions from the charm-meson constituents of $X$, which is insensitive
to the binding energy. A simple modification of the comover interaction model
gives excellent fits to the data from the LHCb collaboration on the
multiplicity dependence of the production of $X$ and $\psi(2S)$ using
parameters compatible with $X$ being a loosely bound charm-meson molecule.
| [
{
"created": "Fri, 25 Dec 2020 03:12:18 GMT",
"version": "v1"
}
] | 2021-04-21 | [
[
"Braaten",
"Eric",
""
],
[
"He",
"Li-Ping",
""
],
[
"Ingles",
"Kevin",
""
],
[
"Jiang",
"Jun",
""
]
] | The dependence of the production of the $X(3872)$ meson on the hadron multiplicity in $pp$ collisions has been used as evidence against $X$ being a charm-meson molecule. The argument is based in part on the incorrect assumption that the cross section for the breakup of $X$ by scattering with comovers can be approximated by a geometric cross section inversely proportional to the binding energy of $X$. The breakup cross section should instead be approximated by the probability-weighted sum of the cross sections for the scattering of comoving pions from the charm-meson constituents of $X$, which is insensitive to the binding energy. A simple modification of the comover interaction model gives excellent fits to the data from the LHCb collaboration on the multiplicity dependence of the production of $X$ and $\psi(2S)$ using parameters compatible with $X$ being a loosely bound charm-meson molecule. |
1505.05553 | Amir Fariborz | Amir H. Fariborz, A.Pokraka, T.G. Steele | Connections between chiral Lagrangians and QCD sum-rules | 5 pages, 1 figure | Mod. Phys. Lett. A, Vol. 31, No. 3 (2016) 1650023 | 10.1142/S0217732316500231 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown how a chiral Lagrangian framework can be used to derive
relationships connecting quark-level QCD correlation functions to mesonic-level
two-point functions. Crucial ingredients of this connection are scale factor
matrices relating each distinct quark-level substructure (e.g.,
quark-antiquark, four-quark) to its mesonic counterpart. The scale factors and
mixing angles are combined into a projection matrix to obtain the physical
(hadronic) projection of the QCD correlation function matrix. Such
relationships provide a powerful bridge between chiral Lagrangians and QCD
sum-rules that are particularly effective in studies of the substructure of
light scalar mesons with multiple complicated resonance shapes and substantial
underlying mixings. The validity of these connections is demonstrated for the
example of the isotriplet $a_0(980)$-$a_0(1450)$ system, resulting in an
unambiguous determination of the scale factors from the combined inputs of QCD
sum-rules and chiral Lagrangians. These scale factors lead to a remarkable
agreement between the quark condensates in QCD and the mesonic vacuum
expectation values that induce spontaneous chiral symmetry breaking in chiral
Lagrangians. This concrete example shows a clear sensitivity to the underlying
$a_0$-system mixing angle, illustrating the value of this methodology in
extensions to more complicated mesonic systems.
| [
{
"created": "Wed, 20 May 2015 23:21:29 GMT",
"version": "v1"
}
] | 2016-01-12 | [
[
"Fariborz",
"Amir H.",
""
],
[
"Pokraka",
"A.",
""
],
[
"Steele",
"T. G.",
""
]
] | It is shown how a chiral Lagrangian framework can be used to derive relationships connecting quark-level QCD correlation functions to mesonic-level two-point functions. Crucial ingredients of this connection are scale factor matrices relating each distinct quark-level substructure (e.g., quark-antiquark, four-quark) to its mesonic counterpart. The scale factors and mixing angles are combined into a projection matrix to obtain the physical (hadronic) projection of the QCD correlation function matrix. Such relationships provide a powerful bridge between chiral Lagrangians and QCD sum-rules that are particularly effective in studies of the substructure of light scalar mesons with multiple complicated resonance shapes and substantial underlying mixings. The validity of these connections is demonstrated for the example of the isotriplet $a_0(980)$-$a_0(1450)$ system, resulting in an unambiguous determination of the scale factors from the combined inputs of QCD sum-rules and chiral Lagrangians. These scale factors lead to a remarkable agreement between the quark condensates in QCD and the mesonic vacuum expectation values that induce spontaneous chiral symmetry breaking in chiral Lagrangians. This concrete example shows a clear sensitivity to the underlying $a_0$-system mixing angle, illustrating the value of this methodology in extensions to more complicated mesonic systems. |
1206.5404 | C. Boehm | Genevieve Belanger, Sanjoy Biswas, Celine Boehm, Biswarup
Mukhopadhyaya | Light neutralino dark matter in the MSSM and its implication for LHC
searches for staus | 19p, 4 Figs | null | 10.1007/JHEP12(2012)076 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was shown in a previous study that a lightest neutralino with mass below
30 GeV was severely constrained in the minimal supersymmetric standard model
(MSSM), unless it annihilates via a light stau and thus yields the observed
dark matter abundance. In such a scenario, while the stau is the
next-to-lightest supersymmetric particle (NLSP), the charginos and the other
neutralinos as well as sleptons of the first two families are also likely to be
not too far above the mass bounds laid down by the Large Electron Positron
(LEP) collider. As the branching ratios of decays of the charginos and the
next-to-lightest neutralino into staus are rather large, one expects
significant rates of tau-rich final states in such a case. With this in view,
we investigate the same-sign ditau and tri-tau signals of this scenario at the
Large Hadron Collider (LHC) for two MSSM benchmark points corresponding to
light neutralino dark matter. The associated signal rates for these channels
are computed, for the centre-of-mass energy of 14 TeV. We find that both
channels lead to appreciable rates if the squarks and the gluino are not too
far above a TeV, thus allowing to probe scenarios with light neutralinos in the
14 TeV LHC run with 10-100 fb^{-1}.
| [
{
"created": "Sat, 23 Jun 2012 15:52:05 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2012 14:26:56 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Oct 2012 10:45:25 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Belanger",
"Genevieve",
""
],
[
"Biswas",
"Sanjoy",
""
],
[
"Boehm",
"Celine",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | It was shown in a previous study that a lightest neutralino with mass below 30 GeV was severely constrained in the minimal supersymmetric standard model (MSSM), unless it annihilates via a light stau and thus yields the observed dark matter abundance. In such a scenario, while the stau is the next-to-lightest supersymmetric particle (NLSP), the charginos and the other neutralinos as well as sleptons of the first two families are also likely to be not too far above the mass bounds laid down by the Large Electron Positron (LEP) collider. As the branching ratios of decays of the charginos and the next-to-lightest neutralino into staus are rather large, one expects significant rates of tau-rich final states in such a case. With this in view, we investigate the same-sign ditau and tri-tau signals of this scenario at the Large Hadron Collider (LHC) for two MSSM benchmark points corresponding to light neutralino dark matter. The associated signal rates for these channels are computed, for the centre-of-mass energy of 14 TeV. We find that both channels lead to appreciable rates if the squarks and the gluino are not too far above a TeV, thus allowing to probe scenarios with light neutralinos in the 14 TeV LHC run with 10-100 fb^{-1}. |
1708.02076 | Moritz Greif | Moritz Greif, Carsten Greiner, Bj\"orn Schenke, S\"oren Schlichting,
Zhe Xu | Importance of initial and final state effects for azimuthal correlations
in p+Pb collisions | 6 pages, 4 figures | Phys. Rev. D 96, 091504 (2017) | 10.1103/PhysRevD.96.091504 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the relative importance of initial and final state effects on
azimuthal correlations of gluons in low and high multiplicity p+Pb collisions.
To achieve this, we couple Yang-Mills dynamics of pre-equilibrium gluon fields
(IP-GLASMA) to a perturbative QCD based parton cascade for the final state
evolution (BAMPS) on an event-by-event basis. We find that signatures of both
the initial state correlations and final state interactions are seen in
azimuthal correlation observables, such as
$v_2\left\lbrace2PC\right\rbrace(p_T)$, their strength depending on the event
multiplicity and transverse momentum. Initial state correlations dominate
$v_2\left\lbrace2PC\right\rbrace(p_T)$ in low multiplicity events for
transverse momenta $p_T>2~{\rm GeV}$. While final state interactions are
dominant in high multiplicity events, initial state correlations affect
$v_2\left\lbrace2PC\right\rbrace(p_T)$ for $p_T>2~{\rm GeV}$ as well as the pT
integrated $v_2\left\lbrace2PC\right\rbrace$.
| [
{
"created": "Mon, 7 Aug 2017 11:33:24 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Greif",
"Moritz",
""
],
[
"Greiner",
"Carsten",
""
],
[
"Schenke",
"Björn",
""
],
[
"Schlichting",
"Sören",
""
],
[
"Xu",
"Zhe",
""
]
] | We investigate the relative importance of initial and final state effects on azimuthal correlations of gluons in low and high multiplicity p+Pb collisions. To achieve this, we couple Yang-Mills dynamics of pre-equilibrium gluon fields (IP-GLASMA) to a perturbative QCD based parton cascade for the final state evolution (BAMPS) on an event-by-event basis. We find that signatures of both the initial state correlations and final state interactions are seen in azimuthal correlation observables, such as $v_2\left\lbrace2PC\right\rbrace(p_T)$, their strength depending on the event multiplicity and transverse momentum. Initial state correlations dominate $v_2\left\lbrace2PC\right\rbrace(p_T)$ in low multiplicity events for transverse momenta $p_T>2~{\rm GeV}$. While final state interactions are dominant in high multiplicity events, initial state correlations affect $v_2\left\lbrace2PC\right\rbrace(p_T)$ for $p_T>2~{\rm GeV}$ as well as the pT integrated $v_2\left\lbrace2PC\right\rbrace$. |
hep-ph/9412253 | null | C.W. Kim, A. Sinibaldi and J. Song | A New Scale-Dependent Cosmology with the Generalized Robertson--Walker
Metric and Einstein Equation | Revtex file, 9 pages + 1 figure (included) | null | null | JHU-TIPAC 940023; DFF-215/12/94 | hep-ph astro-ph gr-qc | null | Based on the observed increase of $\Omega _0$ as a function of cosmic scale,
the Robertson--Walker metric and the Einstein equation are generalized so that
$ \Omega_0$, $H_0$, and the age of the Universe, $t_0$, all become functions of
cosmic scales at which we observe them. The calculated local (within our
galaxy) age of the Universe is about 18 Gyr, consistent with the ages of the
oldest stars and globular clusters in our galaxy, while the ages at distant
scales are shorter than the local age, solving the age puzzle. It is also shown
that $H_0$ increases as scale increases, qualitatively consistent with the
recent observations.
| [
{
"created": "Wed, 7 Dec 1994 12:45:11 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 1995 15:32:57 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Kim",
"C. W.",
""
],
[
"Sinibaldi",
"A.",
""
],
[
"Song",
"J.",
""
]
] | Based on the observed increase of $\Omega _0$ as a function of cosmic scale, the Robertson--Walker metric and the Einstein equation are generalized so that $ \Omega_0$, $H_0$, and the age of the Universe, $t_0$, all become functions of cosmic scales at which we observe them. The calculated local (within our galaxy) age of the Universe is about 18 Gyr, consistent with the ages of the oldest stars and globular clusters in our galaxy, while the ages at distant scales are shorter than the local age, solving the age puzzle. It is also shown that $H_0$ increases as scale increases, qualitatively consistent with the recent observations. |
1503.02669 | Jia Liu | Joachim Kopp, Jia Liu, Xiao-Ping Wang (MITP, Johannes Gutenberg
University Mainz) | Boosted Dark Matter in IceCube and at the Galactic Center | 26 pages, 9 figures, 2 tables. v2: References added, matches version
to be published in JHEP. v3: Acknowledgement added | JHEP 04 (2015) 105 | 10.1007/JHEP04(2015)105 | MITP/15-014 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the event excess observed by the IceCube collaboration at
TeV--PeV energies, usually interpreted as evidence for astrophysical neutrinos,
can be explained alternatively by the scattering of highly boosted dark matter
particles. Specifically, we consider a scenario where a $\sim 4$ PeV scalar
dark matter particle $\phi$ can decay to a much lighter dark fermion $\chi$,
which in turn scatters off nuclei in the IceCube detector. Besides these
events, which are exclusively shower-like, the model also predicts a secondary
population of events at $\mathcal{O}(100 \text{TeV})$ originating from the
3-body decay $\phi \to \chi \bar\chi a$, where $a$ is a pseudoscalar which
mediates dark matter--Standard Model interactions and whose decay products
include neutrinos. This secondary population also includes track-like events,
and both populations together provide an excellent fit to the IceCube data. We
then argue that a relic abundance of light Dark Matter particles $\chi$, which
may constitute a subdominant component of the Dark Matter in the Universe, can
have exactly the right properties to explain the observed excess in GeV gamma
rays from the galactic center region. Our boosted Dark Matter scenario also
predicts fluxes of $\mathcal{O}(10)$ TeV positrons and $\mathcal{O}(100
\text{TeV})$ photons from 3-body cascade decays of the heavy Dark Matter
particle $\phi$, and we show how these can be used to constrain parts of the
viable parameter space of the model. Direct detection limits are weak due to
the pseudoscalar couplings of $\chi$. Accelerator constraints on the
pseudoscalar mediator $a$ lead to the conclusion that the preferred mass of $a$
is $\gtrsim 10$ GeV and that large coupling to $b$ quarks but suppressed or
vanishing coupling to leptons are preferred.
| [
{
"created": "Mon, 9 Mar 2015 20:00:36 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Apr 2015 10:23:33 GMT",
"version": "v2"
},
{
"created": "Thu, 21 May 2015 12:58:00 GMT",
"version": "v3"
}
] | 2015-05-22 | [
[
"Kopp",
"Joachim",
"",
"MITP, Johannes Gutenberg\n University Mainz"
],
[
"Liu",
"Jia",
"",
"MITP, Johannes Gutenberg\n University Mainz"
],
[
"Wang",
"Xiao-Ping",
"",
"MITP, Johannes Gutenberg\n University Mainz"
]
] | We show that the event excess observed by the IceCube collaboration at TeV--PeV energies, usually interpreted as evidence for astrophysical neutrinos, can be explained alternatively by the scattering of highly boosted dark matter particles. Specifically, we consider a scenario where a $\sim 4$ PeV scalar dark matter particle $\phi$ can decay to a much lighter dark fermion $\chi$, which in turn scatters off nuclei in the IceCube detector. Besides these events, which are exclusively shower-like, the model also predicts a secondary population of events at $\mathcal{O}(100 \text{TeV})$ originating from the 3-body decay $\phi \to \chi \bar\chi a$, where $a$ is a pseudoscalar which mediates dark matter--Standard Model interactions and whose decay products include neutrinos. This secondary population also includes track-like events, and both populations together provide an excellent fit to the IceCube data. We then argue that a relic abundance of light Dark Matter particles $\chi$, which may constitute a subdominant component of the Dark Matter in the Universe, can have exactly the right properties to explain the observed excess in GeV gamma rays from the galactic center region. Our boosted Dark Matter scenario also predicts fluxes of $\mathcal{O}(10)$ TeV positrons and $\mathcal{O}(100 \text{TeV})$ photons from 3-body cascade decays of the heavy Dark Matter particle $\phi$, and we show how these can be used to constrain parts of the viable parameter space of the model. Direct detection limits are weak due to the pseudoscalar couplings of $\chi$. Accelerator constraints on the pseudoscalar mediator $a$ lead to the conclusion that the preferred mass of $a$ is $\gtrsim 10$ GeV and that large coupling to $b$ quarks but suppressed or vanishing coupling to leptons are preferred. |
1802.10313 | Fernand Renard M | Fernand M Renard | Polarization effects due to dark matter interaction between massive
standard particles | 19 pages, 12 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose deeper tests of the existence of DM interactions between heavy
particles in $e^+e^-\to t\bar t, ZZ, W^+W^-$ by looking at the effects on final
state polarization. We show that indeed $t$, $W$ and $Z$ polarization are
particularly sensitive to the structure of these interactions, to their
relation with the origin of the masses and to the quantum numbers of the
possibly exchanged dark particles.
| [
{
"created": "Wed, 28 Feb 2018 09:03:56 GMT",
"version": "v1"
}
] | 2018-03-01 | [
[
"Renard",
"Fernand M",
""
]
] | We propose deeper tests of the existence of DM interactions between heavy particles in $e^+e^-\to t\bar t, ZZ, W^+W^-$ by looking at the effects on final state polarization. We show that indeed $t$, $W$ and $Z$ polarization are particularly sensitive to the structure of these interactions, to their relation with the origin of the masses and to the quantum numbers of the possibly exchanged dark particles. |
1911.04137 | Egle Tomasi-Gustafsson | Yu.M. Bystritskiy and V.A. Zykunov and A. Dbeyssi and M. Zambrana and
F. Maas and E. Tomasi-Gustafsson | Radiative corrections in proton--antiproton annihilation to
electron-positron and their application to the PANDA experiment | 16 pages 12 figures | null | 10.1140/epja/s10050-020-00063-6 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative corrections to the annihilation of proton--antiproton into
electron--positron are revisited, including virtual and real (soft and hard)
photon emission. This issue is relevant for the time-like form factors
measurements planned at the PANDA experiment at the FAIR facility, in next
future. The relevant formulas are given. A stand-alone Monte-Carlo integrator
is developed on the basis of the calculated radiative cross section and its
application to the PANDA experiment is illustrated.
| [
{
"created": "Mon, 11 Nov 2019 08:36:44 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Zykunov",
"V. A.",
""
],
[
"Dbeyssi",
"A.",
""
],
[
"Zambrana",
"M.",
""
],
[
"Maas",
"F.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] | Radiative corrections to the annihilation of proton--antiproton into electron--positron are revisited, including virtual and real (soft and hard) photon emission. This issue is relevant for the time-like form factors measurements planned at the PANDA experiment at the FAIR facility, in next future. The relevant formulas are given. A stand-alone Monte-Carlo integrator is developed on the basis of the calculated radiative cross section and its application to the PANDA experiment is illustrated. |
1204.2474 | Keun-young Kim | Raul Alvares, Nick Evans, and Keun-Young Kim | Holography of the Conformal Window | 10 pages, 2 figures, v2: minor corrections, improved Figure 2 | Phys.Rev. D86 (2012) 026008 | 10.1103/PhysRevD.86.026008 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the model of Jarvinen and Kiritsis, we present a simple
holographic model for the on set of chiral symmetry breaking at the edge of the
conformal window in QCD in the Veneziano limit. Our most naive model enforces
the QCD two loop running coupling on a D3/D7 holographic brane system. The mass
of the holographic field, describing the chiral condensate in the model, is
driven below the BF bound when the running is sufficiently strong, triggering
chiral symmetry breaking for N_f/N_c<2.9. This model though contains too great
a remnant of supersymmetry and does not correctly encode the perturbative
anomalous dimensions of QCD. In a second model we impose the QCD anomalous
dimension result and find chiral symmetry breaking sets in for N_f/N_c=4 at a
BKT-type phase transition. In this case the transition is triggered when the
anomalous dimension of the mass operator \gamma_m=1.
| [
{
"created": "Wed, 11 Apr 2012 15:29:01 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2012 02:55:10 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Alvares",
"Raul",
""
],
[
"Evans",
"Nick",
""
],
[
"Kim",
"Keun-Young",
""
]
] | Inspired by the model of Jarvinen and Kiritsis, we present a simple holographic model for the on set of chiral symmetry breaking at the edge of the conformal window in QCD in the Veneziano limit. Our most naive model enforces the QCD two loop running coupling on a D3/D7 holographic brane system. The mass of the holographic field, describing the chiral condensate in the model, is driven below the BF bound when the running is sufficiently strong, triggering chiral symmetry breaking for N_f/N_c<2.9. This model though contains too great a remnant of supersymmetry and does not correctly encode the perturbative anomalous dimensions of QCD. In a second model we impose the QCD anomalous dimension result and find chiral symmetry breaking sets in for N_f/N_c=4 at a BKT-type phase transition. In this case the transition is triggered when the anomalous dimension of the mass operator \gamma_m=1. |
1904.09921 | Hannu Paukkunen | Ilkka Helenius, John Lajoie, Joseph D. Osborn, Petja Paakkinen, Hannu
Paukkunen | Nuclear gluons at RHIC in a multi-observable approach | 10 pages, the version to appear in PRD | Phys. Rev. D 100, 014004 (2019) | 10.1103/PhysRevD.100.014004 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility of measuring nuclear gluon distributions at the
Relativistic Heavy-Ion Collider (RHIC) with $\sqrt{s}=200 \, {\rm GeV}$
proton-nucleus collisions. In addition to measurements at central rapidity, we
consider also observables at forward rapidity, consistent with proposed
upgrades to the experimental capabilities of STAR and sPHENIX. The processes we
consider consist of Drell-Yan dilepton, dijet, and direct photon-jet
production. The Drell-Yan process is found to be an efficient probe of gluons
at small momentum fractions. In order to fully utilize the potential of
Drell-Yan measurements we demonstrate how the overall normalization uncertainty
present in the experimental data can be fixed using other experimental
observables. An asset of the RHIC collider is its flexibility to run with
different ion beams, and we outline how this ability could be taken advantage
of to measure the $A$ dependence of gluon distributions for which the current
constraints are scarce.
| [
{
"created": "Mon, 22 Apr 2019 15:23:41 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2019 07:02:43 GMT",
"version": "v2"
}
] | 2019-07-17 | [
[
"Helenius",
"Ilkka",
""
],
[
"Lajoie",
"John",
""
],
[
"Osborn",
"Joseph D.",
""
],
[
"Paakkinen",
"Petja",
""
],
[
"Paukkunen",
"Hannu",
""
]
] | We explore the possibility of measuring nuclear gluon distributions at the Relativistic Heavy-Ion Collider (RHIC) with $\sqrt{s}=200 \, {\rm GeV}$ proton-nucleus collisions. In addition to measurements at central rapidity, we consider also observables at forward rapidity, consistent with proposed upgrades to the experimental capabilities of STAR and sPHENIX. The processes we consider consist of Drell-Yan dilepton, dijet, and direct photon-jet production. The Drell-Yan process is found to be an efficient probe of gluons at small momentum fractions. In order to fully utilize the potential of Drell-Yan measurements we demonstrate how the overall normalization uncertainty present in the experimental data can be fixed using other experimental observables. An asset of the RHIC collider is its flexibility to run with different ion beams, and we outline how this ability could be taken advantage of to measure the $A$ dependence of gluon distributions for which the current constraints are scarce. |
1303.5284 | Michele Frigerio | Michele Frigerio (L2C, Montpellier) and Albert Villanova del Moral
(LUPM, Montpellier) | Minimal lepton flavour structures lead to non-maximal 2-3 mixing | 24 pages, 10 figures | JHEP 1307 (2013) 146 | 10.1007/JHEP07(2013)146 | L2C:13-045, LUPM:13-004 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present data prefer a large but non-maximal 2-3 mixing in the lepton sector.
We argue that this value, in connection with $\sin\theta_{13}\simeq 0.15$, is
the generic outcome of minimal flavour structures. We present a few different
incarnations of this statement, in terms of lepton mass matrices depending on a
small number of parameters, that can be justified by discrete flavour
symmetries. We also propose a general procedure to study the correlation
between $\theta_{23}$, the absolute scale and ordering of the neutrino masses,
and the leptonic CP-violating phases.
| [
{
"created": "Thu, 21 Mar 2013 15:06:09 GMT",
"version": "v1"
}
] | 2017-08-15 | [
[
"Frigerio",
"Michele",
"",
"L2C, Montpellier"
],
[
"del Moral",
"Albert Villanova",
"",
"LUPM, Montpellier"
]
] | Present data prefer a large but non-maximal 2-3 mixing in the lepton sector. We argue that this value, in connection with $\sin\theta_{13}\simeq 0.15$, is the generic outcome of minimal flavour structures. We present a few different incarnations of this statement, in terms of lepton mass matrices depending on a small number of parameters, that can be justified by discrete flavour symmetries. We also propose a general procedure to study the correlation between $\theta_{23}$, the absolute scale and ordering of the neutrino masses, and the leptonic CP-violating phases. |
2306.17591 | Marcos Vinicius dos Santos | Marcos V. dos Santos, Pedro C. de Holanda, Pedro Dedin Neto, Ernesto
Kemp | On the Effects of Quantum Decoherence in a Future Supernova Neutrino
Detection | null | null | null | null | hep-ph astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Quantum decoherence effects in neutrinos, described by the open quantum
systems formalism, serve as a gateway to explore potential new physics,
including quantum gravity. Previous research extensively investigated these
effects across various neutrino sources, imposing stringent constraints on the
spontaneous loss of coherence. In this study, we demonstrate that even within
the Supernovae environment, where neutrinos are released as incoherent states,
quantum decoherence could influence the flavor equipartition of $3\nu$ mixing.
Additionally, we examine the potential energy dependence of quantum decoherence
parameters ($\Gamma = \Gamma_0 (E/E_0)^n$) with different power laws ($n = 0,
2, 5/2$). Our findings indicate that future-generation detectors (DUNE,
Hyper-K, and JUNO) can significantly constrain quantum decoherence effects
under different scenarios. For a Supernova located 10 kpc away from Earth, DUNE
could potentially establish $3\sigma$ bounds of $\Gamma \leq 6.2 \times
10^{-14}$ eV in the normal mass hierarchy (NH) scenario, while Hyper-K could
impose a $2\sigma$ limit of $\Gamma \leq 3.6 \times 10^{-14}$ eV for the
inverted mass hierarchy (IH) scenario with $n=0$ - assuming no energy exchange
between the neutrino subsystem and non-standard environment ($[H,V_p] = 0$).
These limits become even more restrictive for a closer Supernova. When we relax
the assumption of energy exchange ($[H,V_p] \neq 0$), for a 10 kpc SN, DUNE can
establish a $3\sigma$ limit of $\Gamma_8 \leq 4.2 \times 10^{-28}$ eV for NH,
while Hyper-K could constrain $\Gamma_8 \leq 1.3 \times 10^{-27}$ eV for IH
($n=0$) with $2\sigma$, representing the most stringent bounds reported to
date. Furthermore, we examine the impact of neutrino loss during propagation
for future Supernova detection.
| [
{
"created": "Fri, 30 Jun 2023 12:12:24 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2023 13:34:21 GMT",
"version": "v2"
}
] | 2023-07-12 | [
[
"Santos",
"Marcos V. dos",
""
],
[
"de Holanda",
"Pedro C.",
""
],
[
"Neto",
"Pedro Dedin",
""
],
[
"Kemp",
"Ernesto",
""
]
] | Quantum decoherence effects in neutrinos, described by the open quantum systems formalism, serve as a gateway to explore potential new physics, including quantum gravity. Previous research extensively investigated these effects across various neutrino sources, imposing stringent constraints on the spontaneous loss of coherence. In this study, we demonstrate that even within the Supernovae environment, where neutrinos are released as incoherent states, quantum decoherence could influence the flavor equipartition of $3\nu$ mixing. Additionally, we examine the potential energy dependence of quantum decoherence parameters ($\Gamma = \Gamma_0 (E/E_0)^n$) with different power laws ($n = 0, 2, 5/2$). Our findings indicate that future-generation detectors (DUNE, Hyper-K, and JUNO) can significantly constrain quantum decoherence effects under different scenarios. For a Supernova located 10 kpc away from Earth, DUNE could potentially establish $3\sigma$ bounds of $\Gamma \leq 6.2 \times 10^{-14}$ eV in the normal mass hierarchy (NH) scenario, while Hyper-K could impose a $2\sigma$ limit of $\Gamma \leq 3.6 \times 10^{-14}$ eV for the inverted mass hierarchy (IH) scenario with $n=0$ - assuming no energy exchange between the neutrino subsystem and non-standard environment ($[H,V_p] = 0$). These limits become even more restrictive for a closer Supernova. When we relax the assumption of energy exchange ($[H,V_p] \neq 0$), for a 10 kpc SN, DUNE can establish a $3\sigma$ limit of $\Gamma_8 \leq 4.2 \times 10^{-28}$ eV for NH, while Hyper-K could constrain $\Gamma_8 \leq 1.3 \times 10^{-27}$ eV for IH ($n=0$) with $2\sigma$, representing the most stringent bounds reported to date. Furthermore, we examine the impact of neutrino loss during propagation for future Supernova detection. |
1605.05900 | Jose Miguel No | Jose Miguel No | Is it $SU(2)_{\mathrm{L}}$ or just $U(1)_{\mathrm{Y}}$? $750$ GeV
di-photon probes of the electroweak nature of new states | 6 Pages, 5 Figures | Phys. Rev. D 94, 035020 (2016) | 10.1103/PhysRevD.94.035020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of a 750 GeV di-photon spin-0 resonance $S$ would imply the
additional presence of new particles beyond the Standard Model, coupling
directly to $S$ and electromagnetically charged. For an $SU(2)_{\mathrm{L}}$
singlet $S$, we explore the possibility of probing the $SU(2)_{\mathrm{L}}$ and
$U(1)_{\mathrm{Y}}$ quantum numbers of the new states at the LHC by
measuring/constraining the $WW$, $Z\gamma$ and $ZZ$ decays of $S$. We obtain
robust prospects on the required LHC integrated luminosity to discover the new
decay modes of $S$, and discuss the implications of these measurements for
probing the electroweak nature of the new states. We also discuss the impact of
$S$ mixing with the SM Higgs in such probes.
| [
{
"created": "Thu, 19 May 2016 11:48:45 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"No",
"Jose Miguel",
""
]
] | The existence of a 750 GeV di-photon spin-0 resonance $S$ would imply the additional presence of new particles beyond the Standard Model, coupling directly to $S$ and electromagnetically charged. For an $SU(2)_{\mathrm{L}}$ singlet $S$, we explore the possibility of probing the $SU(2)_{\mathrm{L}}$ and $U(1)_{\mathrm{Y}}$ quantum numbers of the new states at the LHC by measuring/constraining the $WW$, $Z\gamma$ and $ZZ$ decays of $S$. We obtain robust prospects on the required LHC integrated luminosity to discover the new decay modes of $S$, and discuss the implications of these measurements for probing the electroweak nature of the new states. We also discuss the impact of $S$ mixing with the SM Higgs in such probes. |
0911.0687 | John Kehayias | John Kehayias and Stefano Profumo | Semi-Analytic Calculation of the Gravitational Wave Signal From the
Electroweak Phase Transition for General Quartic Scalar Effective Potentials | accepted by JCAP, revisions: removed turbulence contribution, minor
changes to experimental sensitivity, fixed various minor typos and text
revisions, added references, made it clear we consider only detonations; 17
pages, 4 figures, revtex4 | JCAP 1003:003,2010 | 10.1088/1475-7516/2010/03/003 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Upcoming gravitational wave (GW) detectors might detect a stochastic
background of GWs potentially arising from many possible sources, including
bubble collisions from a strongly first-order electroweak phase transition. We
investigate whether it is possible to connect, via a semi-analytical
approximation to the tunneling rate of scalar fields with quartic potentials,
the GW signal through detonations with the parameters entering the potential
that drives the electroweak phase transition. To this end, we consider a finite
temperature effective potential similar in form to the Higgs potential in the
Standard Model (SM). In the context of a semi-analytic approximation to the
three dimensional Euclidean action, we derive a general approximate form for
the tunneling temperature and the relevant GW parameters. We explore the GW
signal across the parameter space describing the potential which drives the
phase transition. We comment on the potential detectability of a GW signal with
future experiments, and physical relevance of the associated potential
parameters in the context of theories which have effective potentials similar
in form to that of the SM. In particular we consider singlet, triplet, higher
dimensional operators, and top-flavor extensions to the Higgs sector of the SM.
We find that the addition of a temperature independent cubic term in the
potential, arising from a gauge singlet for instance, can greatly enhance the
GW power. The other parameters have milder, but potentially noticeable,
effects.
| [
{
"created": "Tue, 3 Nov 2009 21:03:14 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Feb 2010 00:41:45 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Feb 2010 19:55:49 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Kehayias",
"John",
""
],
[
"Profumo",
"Stefano",
""
]
] | Upcoming gravitational wave (GW) detectors might detect a stochastic background of GWs potentially arising from many possible sources, including bubble collisions from a strongly first-order electroweak phase transition. We investigate whether it is possible to connect, via a semi-analytical approximation to the tunneling rate of scalar fields with quartic potentials, the GW signal through detonations with the parameters entering the potential that drives the electroweak phase transition. To this end, we consider a finite temperature effective potential similar in form to the Higgs potential in the Standard Model (SM). In the context of a semi-analytic approximation to the three dimensional Euclidean action, we derive a general approximate form for the tunneling temperature and the relevant GW parameters. We explore the GW signal across the parameter space describing the potential which drives the phase transition. We comment on the potential detectability of a GW signal with future experiments, and physical relevance of the associated potential parameters in the context of theories which have effective potentials similar in form to that of the SM. In particular we consider singlet, triplet, higher dimensional operators, and top-flavor extensions to the Higgs sector of the SM. We find that the addition of a temperature independent cubic term in the potential, arising from a gauge singlet for instance, can greatly enhance the GW power. The other parameters have milder, but potentially noticeable, effects. |
2204.05945 | Luca Di Luzio | Luca Di Luzio, Marco Nardecchia, Claudio Toni | Light vectors coupled to anomalous currents with harmless Wess-Zumino
terms | 23 pages, 1 figure. Minor corrections and references added. Matches
published version | Phys. Rev. D 105, 115042 (2022) | 10.1103/PhysRevD.105.115042 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We reconsider the case of light vectors coupled to anomalous fermionic
currents, focussing on the interplay between UV and IR dynamics. Taking as a
general framework the gauging of the Standard Model accidental symmetries, we
show that it is possible to devise an anomaly-free UV completion with
mostly-chiral heavy fermions such that anomalous Wess-Zumino terms are
suppressed in the IR, thus relaxing would-be strong bounds from the
longitudinal emission of light vectors coupled to non-conserved currents. We
classify such scenarios and show that they will be extensively probed at the
high-luminosity phase of the LHC via the measurement of the $h \to Z \gamma$
rate and the direct search for non-decoupling charged leptons.
| [
{
"created": "Tue, 12 Apr 2022 16:52:44 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2022 15:27:02 GMT",
"version": "v2"
}
] | 2022-06-30 | [
[
"Di Luzio",
"Luca",
""
],
[
"Nardecchia",
"Marco",
""
],
[
"Toni",
"Claudio",
""
]
] | We reconsider the case of light vectors coupled to anomalous fermionic currents, focussing on the interplay between UV and IR dynamics. Taking as a general framework the gauging of the Standard Model accidental symmetries, we show that it is possible to devise an anomaly-free UV completion with mostly-chiral heavy fermions such that anomalous Wess-Zumino terms are suppressed in the IR, thus relaxing would-be strong bounds from the longitudinal emission of light vectors coupled to non-conserved currents. We classify such scenarios and show that they will be extensively probed at the high-luminosity phase of the LHC via the measurement of the $h \to Z \gamma$ rate and the direct search for non-decoupling charged leptons. |
hep-ph/0005232 | Thomas Gehrmann | T.Gehrmann, E. Remiddi | Using differential equations to compute two-loop box integrals | 5 pages, LaTeX, uses espcrc2.sty; presented at Loops and Legs in
Quantum Field Theory, April 2000, Bastei, Germany | Nucl.Phys.Proc.Suppl.89:251-255,2000 | 10.1016/S0920-5632(00)00851-3 | Karlsruhe TTP00-10 | hep-ph | null | The calculation of exclusive observables beyond the one-loop level requires
elaborate techniques for the computation of multi-leg two-loop integrals. We
discuss how the large number of different integrals appearing in actual
two-loop calculations can be reduced to a small number of master integrals. An
efficient method to compute these master integrals is to derive and solve
differential equations in the external invariants for them. As an application
of the differential equation method, we compute the ${\cal O}(\epsilon)$-term
of a particular combination of on-shell massless planar double box integrals,
which appears in the tensor reduction of $2 \to 2$ scattering amplitudes at two
loops.
| [
{
"created": "Tue, 23 May 2000 15:28:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gehrmann",
"T.",
""
],
[
"Remiddi",
"E.",
""
]
] | The calculation of exclusive observables beyond the one-loop level requires elaborate techniques for the computation of multi-leg two-loop integrals. We discuss how the large number of different integrals appearing in actual two-loop calculations can be reduced to a small number of master integrals. An efficient method to compute these master integrals is to derive and solve differential equations in the external invariants for them. As an application of the differential equation method, we compute the ${\cal O}(\epsilon)$-term of a particular combination of on-shell massless planar double box integrals, which appears in the tensor reduction of $2 \to 2$ scattering amplitudes at two loops. |
1912.10225 | Pengxuan Zhu | Junjie Cao, Jingwei Lian, Lei Meng, Yuanfang Yue and Pengxuan Zhu | Anomalous Muon Magnetic Moment in the Inverse Seesaw Extended
Next-to-Minimal Supersymmetric Standard Model | 18 pages, 4 figures | Phys. Rev. D 101, 095009 (2020) | 10.1103/PhysRevD.101.095009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work investigates the possibility that both dark matter and the
anomalous magnetic moment of the muon may be explained within the context of
the inverse seesaw extended Next-to-Minimal Supersymmetric Standard Model
(ISS-NMSSM). In ISS-NMSSM, the newly introduced Higgs-neutrino Yukawa coupling
$Y_\nu$ provides additional Higgsino-sneutrino loop contribution to
$(g-2)_{\mu}$. If the deviation between the experimental observations and the
Standard Model predictions of the anomalous muon magnetic moment is confirmed
by the further experimental and theoretical studies, it can be explained
naturally within the ISS-NMSSM framework without conflicting with the current
stringent limits on the direct detection of dark matter and Large Hadron
Collider searches.
| [
{
"created": "Sat, 21 Dec 2019 08:55:15 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jan 2020 10:09:17 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Apr 2020 08:59:25 GMT",
"version": "v3"
}
] | 2020-05-12 | [
[
"Cao",
"Junjie",
""
],
[
"Lian",
"Jingwei",
""
],
[
"Meng",
"Lei",
""
],
[
"Yue",
"Yuanfang",
""
],
[
"Zhu",
"Pengxuan",
""
]
] | The present work investigates the possibility that both dark matter and the anomalous magnetic moment of the muon may be explained within the context of the inverse seesaw extended Next-to-Minimal Supersymmetric Standard Model (ISS-NMSSM). In ISS-NMSSM, the newly introduced Higgs-neutrino Yukawa coupling $Y_\nu$ provides additional Higgsino-sneutrino loop contribution to $(g-2)_{\mu}$. If the deviation between the experimental observations and the Standard Model predictions of the anomalous muon magnetic moment is confirmed by the further experimental and theoretical studies, it can be explained naturally within the ISS-NMSSM framework without conflicting with the current stringent limits on the direct detection of dark matter and Large Hadron Collider searches. |
1610.05123 | Wolfgang Sch\"afer | Wolfgang Sch\"afer, Antoni Szczurek | Drell-Yan production at forward rapidities: a hybrid factorization
approach | talk given by WS at the 24th Low-x Meeting, Gy\"ongy\"os, Hungary,
June 6-11 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Drell-Yan production of dileptons at high energies in the
forward rapidity region of proton-proton collisions in a hybrid high-energy
approach. This approach uses unintegrated gluon distributions in one proton and
collinear quark/antiquark distributions in the second proton.
We compute various distributions for the case of low-mass dilepton production
and compare to the LHCb and ATLAS experimental data on dilepton mass
distributions. In distinction to dipole approaches, we include four Drell-Yan
structure functions as well as cuts at the level of lepton kinematics. The
impact of the interference structure functions is rather small for typical
experimental cuts. We find that both side contributions ($g q/\bar q$ and
$q/\bar q g$) have to be included even for the LHCb rapidity coverage which is
in contradiction with what is usually done in the dipole approach. We present
results for different unintegrated gluon distributions from the literature.
Some of them include saturation effects, but we see no clear hints of
saturation even at small $M_{ll}$.
| [
{
"created": "Mon, 17 Oct 2016 14:04:34 GMT",
"version": "v1"
}
] | 2016-10-18 | [
[
"Schäfer",
"Wolfgang",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss the Drell-Yan production of dileptons at high energies in the forward rapidity region of proton-proton collisions in a hybrid high-energy approach. This approach uses unintegrated gluon distributions in one proton and collinear quark/antiquark distributions in the second proton. We compute various distributions for the case of low-mass dilepton production and compare to the LHCb and ATLAS experimental data on dilepton mass distributions. In distinction to dipole approaches, we include four Drell-Yan structure functions as well as cuts at the level of lepton kinematics. The impact of the interference structure functions is rather small for typical experimental cuts. We find that both side contributions ($g q/\bar q$ and $q/\bar q g$) have to be included even for the LHCb rapidity coverage which is in contradiction with what is usually done in the dipole approach. We present results for different unintegrated gluon distributions from the literature. Some of them include saturation effects, but we see no clear hints of saturation even at small $M_{ll}$. |
1103.0908 | Wilco J. den Dunnen | Daniel Boer, Wilco J. den Dunnen, Aram Kotzinian | Double Sivers effect asymmetries and their impact on transversity
measurements at RHIC | 12 pages, 11 eps figures, minor changes, matches the published
version | Phys.Rev.D83:114032,2011 | 10.1103/PhysRevD.83.114032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study double transverse spin asymmetries in the Drell-Yan process at
measured transverse momentum of the lepton pair. Contrary to what a collinear
factorization approach would suggest, a nonzero double transverse spin
asymmetry in the laboratory frame a priori does not imply nonzero transversity.
TMD effects, such as the double Sivers effect, in principle form a background.
Using the current knowledge of the relevant TMDs we estimate their contribution
in the laboratory frame for Drell-Yan and W production at RHIC and point out a
cross check asymmetry measurement to bound the TMD contributions. We also
comment on the transverse momentum integrated asymmetries that only receive
power suppressed background contributions.
| [
{
"created": "Fri, 4 Mar 2011 14:30:46 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2011 10:15:54 GMT",
"version": "v2"
}
] | 2011-07-04 | [
[
"Boer",
"Daniel",
""
],
[
"Dunnen",
"Wilco J. den",
""
],
[
"Kotzinian",
"Aram",
""
]
] | We study double transverse spin asymmetries in the Drell-Yan process at measured transverse momentum of the lepton pair. Contrary to what a collinear factorization approach would suggest, a nonzero double transverse spin asymmetry in the laboratory frame a priori does not imply nonzero transversity. TMD effects, such as the double Sivers effect, in principle form a background. Using the current knowledge of the relevant TMDs we estimate their contribution in the laboratory frame for Drell-Yan and W production at RHIC and point out a cross check asymmetry measurement to bound the TMD contributions. We also comment on the transverse momentum integrated asymmetries that only receive power suppressed background contributions. |
hep-ph/9907229 | Fred Jegerlehner | F. Jegerlehner, K. Kolodziej | The hard bremsstrahlung correction to e^+ e^- -> 4f with finite fermion
masses: results for e^+ e^- -> u d-bar mu^- nu | 18 pages, 6 figures | Eur.Phys.J.C12:77-86,2000 | 10.1007/s100529900202 | Univ. of Silesia Katowice TP-USl/99/01, DESY 99-052 | hep-ph | null | An improved efficient method of calculating the hard bremsstrahlung
correction to e^+ e^- -> 4f for non-zero fermion masses is presented. The
non-vanishing fermion masses allow us to perform the phase space integrations
to the very collinear limit. We therefore can calculate cross sections
independent of angular cuts. Such calculations are important for background
studies. Results are presented for the total and some differential cross
sections for e^+ e^- -> u d-bar mu^- nu and the corresponding hard
bremsstrahlung process. The latter is of particular interest for a detailed
investigation of the effects of final state radiation. In principle, the
process e^+ e^- -> u d-bar mu^- nu gamma is also interesting since it helps to
set bounds on possible anomalous triple and quartic gauge boson couplings
involving photons. The size of mass effects is illustrated by comparing the
final states u d-bar mu^- nu (gamma), c s-bar mu^- nu (gamma) and u d-bar tau^-
nu(gamma).
| [
{
"created": "Mon, 5 Jul 1999 11:48:37 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Jegerlehner",
"F.",
""
],
[
"Kolodziej",
"K.",
""
]
] | An improved efficient method of calculating the hard bremsstrahlung correction to e^+ e^- -> 4f for non-zero fermion masses is presented. The non-vanishing fermion masses allow us to perform the phase space integrations to the very collinear limit. We therefore can calculate cross sections independent of angular cuts. Such calculations are important for background studies. Results are presented for the total and some differential cross sections for e^+ e^- -> u d-bar mu^- nu and the corresponding hard bremsstrahlung process. The latter is of particular interest for a detailed investigation of the effects of final state radiation. In principle, the process e^+ e^- -> u d-bar mu^- nu gamma is also interesting since it helps to set bounds on possible anomalous triple and quartic gauge boson couplings involving photons. The size of mass effects is illustrated by comparing the final states u d-bar mu^- nu (gamma), c s-bar mu^- nu (gamma) and u d-bar tau^- nu(gamma). |
hep-ph/0504127 | Bertram Klein | J. Braun (1), B. Klein (2), H.J. Pirner (1 and 3) ((1) Institute for
Theoretical Physics, University of Heidelberg, (2) GSI Darmstadt, (3)
Max-Planck-Institut fuer Kernphysik, Heidelberg) | Influence of quark boundary conditions on the pion mass in finite volume | 24 pages, 5 figures, RevTex4, published version, discussion of
lattice results extended | Phys.Rev. D72 (2005) 034017 | 10.1103/PhysRevD.72.034017 | null | hep-ph | null | We calculate the mass shift for the pion in a finite volume with
renormalization group (RG) methods in the framework of the quark-mesons model.
In particular, we investigate the importance of the quark effects on the pion
mass. As in lattice gauge theory, the choice of quark boundary conditions has a
noticeable effect on the pion mass shift in small volumes, in addition to the
shift due to pion interactions. We compare our results to chiral perturbation
theory calculations and find differences due to the fact that chiral
perturbation theory only considers pion effects in the finite volume.
| [
{
"created": "Fri, 15 Apr 2005 14:55:07 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2006 15:51:15 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Braun",
"J.",
"",
"1 and 3"
],
[
"Klein",
"B.",
"",
"1 and 3"
],
[
"Pirner",
"H. J.",
"",
"1 and 3"
]
] | We calculate the mass shift for the pion in a finite volume with renormalization group (RG) methods in the framework of the quark-mesons model. In particular, we investigate the importance of the quark effects on the pion mass. As in lattice gauge theory, the choice of quark boundary conditions has a noticeable effect on the pion mass shift in small volumes, in addition to the shift due to pion interactions. We compare our results to chiral perturbation theory calculations and find differences due to the fact that chiral perturbation theory only considers pion effects in the finite volume. |
hep-ph/0401210 | Chris Quigg | Estia J. Eichten, Kenneth Lane, and Chris Quigg | Charmonium levels near threshold and the narrow state $X(3872) \to
\pi^{+}\pi^{-}\jpsi$ | 8 pages, 6 figures, uses RevTeX and boxedeps; few transcription
errors corrected in Tables IV and VI, three entries added in Table V, updated
references. Version to appear in Phys. Rev. D | Phys.Rev.D69:094019,2004 | 10.1103/PhysRevD.69.094019 | FERMILAB-Pub-04/001-T, BUHEP-04-01 | hep-ph | null | We explore the influence of open-charm channels on charmonium properties, and
profile the 1:3D2, 1:3D3 and 2:1P1 charmonium candidates for X(3872). The
favored candidates, the 1:3D2 and 1:3D3 levels, both have prominent radiative
decays. The 1:3D2 might be visible in the $D^{0}\bar{D}^{*0}$ channel, while
the dominant decay of the 1:3D3 state should be into $D\bar{D}$. We propose
that additional discrete charmonium levels can be discovered as narrow
resonances of charmed and anticharmed mesons.
| [
{
"created": "Mon, 26 Jan 2004 19:39:06 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Apr 2004 19:29:15 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Eichten",
"Estia J.",
""
],
[
"Lane",
"Kenneth",
""
],
[
"Quigg",
"Chris",
""
]
] | We explore the influence of open-charm channels on charmonium properties, and profile the 1:3D2, 1:3D3 and 2:1P1 charmonium candidates for X(3872). The favored candidates, the 1:3D2 and 1:3D3 levels, both have prominent radiative decays. The 1:3D2 might be visible in the $D^{0}\bar{D}^{*0}$ channel, while the dominant decay of the 1:3D3 state should be into $D\bar{D}$. We propose that additional discrete charmonium levels can be discovered as narrow resonances of charmed and anticharmed mesons. |
hep-ph/9911494 | Hou Defu | Hou Defu, M.E. Carrington, R. Kobes and U. Heinz | Four-Point Spectral Functions and Ward Identities in Hot QED | 16 pages in Revtex with 3 figures, dense version, a typo corrected | Phys.Rev.D61:085013,2000; Erratum-ibid.D67:049902,2003 | 10.1103/PhysRevD.61.085013 10.1103/PhysRevD.67.049902 | CERN-TH/99-351 | hep-ph hep-th | null | We derive spectral representations for the different components of the
4-point function at finite temperature in the real time formalism in terms of
five real spectral densities. We explicitly calculate all these functions in
QED in the hard thermal loop approximation. The Ward identities obeyed by the
1-loop 3- and 4-point functions in real time and their spectral functions are
derived. We compare our results with those derived previously in the
imaginary-time formalism for retarded functions in hot QCD, and we discuss the
generalization of our results to non-equilibrium situations.
| [
{
"created": "Thu, 25 Nov 1999 18:49:57 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 1999 16:56:36 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Defu",
"Hou",
""
],
[
"Carrington",
"M. E.",
""
],
[
"Kobes",
"R.",
""
],
[
"Heinz",
"U.",
""
]
] | We derive spectral representations for the different components of the 4-point function at finite temperature in the real time formalism in terms of five real spectral densities. We explicitly calculate all these functions in QED in the hard thermal loop approximation. The Ward identities obeyed by the 1-loop 3- and 4-point functions in real time and their spectral functions are derived. We compare our results with those derived previously in the imaginary-time formalism for retarded functions in hot QCD, and we discuss the generalization of our results to non-equilibrium situations. |
1704.07627 | Sven Heinemeyer | S. Heinemeyer, C. Schappacher | Chargino and Neutralino Production at e+e- Colliders in the Complex
MSSM: A Full One-Loop Analysis | 45 pages, 26 figures. arXiv admin note: substantial text overlap with
arXiv:1606.06981, arXiv:1511.06002 | null | 10.1140/epjc/s10052-017-5195-9 | IFT-UAM/CSIC-17-013 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the search for charginos and neutralinos in the Minimal Supersymmetric
Standard Model (MSSM) as well as for future precision analyses of these
particles an accurate knowledge of their production and decay properties is
mandatory. We evaluate the cross sections for the chargino and neutralino
production at e+e- colliders in the MSSM with complex parameters (cMSSM). The
evaluation is based on a full one-loop calculation of the production mechanisms
e+e- -> cha_c cha_c' and e+e- -> neu_n neu_n', including soft and hard photon
radiation. We mostly restricted ourselves to a version of our renormalization
scheme which is valid for |M_1| < |M_2|, |mu| and M_2 != mu to simplify the
analysis, even though we are able to switch to other parameter regions and
correspondingly different renormalization schemes. The dependence of the
chargino/neutralino cross sections on the relevant cMSSM parameters is analyzed
numerically. We find sizable contributions to many production cross sections.
They amount roughly 10-20% of the tree-level results, but can go up to 40% or
higher in extreme cases. Also the complex phase dependence of the one-loop
corrections was found non-negligible. The full one-loop contributions are thus
crucial for physics analyses at a future linear e+e- collider such as the ILC
or CLIC.
| [
{
"created": "Tue, 25 Apr 2017 10:54:45 GMT",
"version": "v1"
}
] | 2017-10-25 | [
[
"Heinemeyer",
"S.",
""
],
[
"Schappacher",
"C.",
""
]
] | For the search for charginos and neutralinos in the Minimal Supersymmetric Standard Model (MSSM) as well as for future precision analyses of these particles an accurate knowledge of their production and decay properties is mandatory. We evaluate the cross sections for the chargino and neutralino production at e+e- colliders in the MSSM with complex parameters (cMSSM). The evaluation is based on a full one-loop calculation of the production mechanisms e+e- -> cha_c cha_c' and e+e- -> neu_n neu_n', including soft and hard photon radiation. We mostly restricted ourselves to a version of our renormalization scheme which is valid for |M_1| < |M_2|, |mu| and M_2 != mu to simplify the analysis, even though we are able to switch to other parameter regions and correspondingly different renormalization schemes. The dependence of the chargino/neutralino cross sections on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to many production cross sections. They amount roughly 10-20% of the tree-level results, but can go up to 40% or higher in extreme cases. Also the complex phase dependence of the one-loop corrections was found non-negligible. The full one-loop contributions are thus crucial for physics analyses at a future linear e+e- collider such as the ILC or CLIC. |
0909.3977 | Andrea Wulzer Dr | Jan Mrazek, Andrea Wulzer | A Strong Sector at the LHC: Top Partners in Same-Sign Dileptons | Corrected some typos, added a reference, 23 pages | Phys.Rev.D81:075006,2010 | 10.1103/PhysRevD.81.075006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy partners of the top quark are a common prediction of many models in
which a new strongly-coupled sector is responsible for the breaking of the EW
symmetry. In this paper we investigate their experimental signature at the LHC,
focusing on the particularly clean channel of same-sign dileptons.
We show that, thank to a strong interaction with the top quark which allows
them to be singly produced at a sizable rate, the top partners will be
discovered at the LHC if their mass is below 1.5 TeV, higher masses being
possible in particularly favorable (but plausible) situations. Being the
partners expected to be lighter in both the Higgsless and Composite-Higgs
scenarios, the one of same-sign dileptons is found to be a very promising
channel in which these models could be tested.
We also discuss several experimental signatures which would allow, after the
discovery of the excess, to uniquely attribute it to the top partners
production and to measure the relevant physical parameters, i.e. the top
partners masses and couplings. We believe that our results constitute a valid
starting point for a more detailed experimental study.
| [
{
"created": "Tue, 22 Sep 2009 12:43:27 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 2009 15:33:08 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Mrazek",
"Jan",
""
],
[
"Wulzer",
"Andrea",
""
]
] | Heavy partners of the top quark are a common prediction of many models in which a new strongly-coupled sector is responsible for the breaking of the EW symmetry. In this paper we investigate their experimental signature at the LHC, focusing on the particularly clean channel of same-sign dileptons. We show that, thank to a strong interaction with the top quark which allows them to be singly produced at a sizable rate, the top partners will be discovered at the LHC if their mass is below 1.5 TeV, higher masses being possible in particularly favorable (but plausible) situations. Being the partners expected to be lighter in both the Higgsless and Composite-Higgs scenarios, the one of same-sign dileptons is found to be a very promising channel in which these models could be tested. We also discuss several experimental signatures which would allow, after the discovery of the excess, to uniquely attribute it to the top partners production and to measure the relevant physical parameters, i.e. the top partners masses and couplings. We believe that our results constitute a valid starting point for a more detailed experimental study. |
hep-ph/0105282 | Roberto Pittau | R. Pittau (Turin U. & INFN, Turin) | Theoretical issues at LEP2 and LC | 3 pages. Talk given at 13th Convegno sulla Fisica al LEP (LEPTRE
2001), Rome, Italy, 18-20 Apr 2001 | null | null | null | hep-ph | null | After 12 years of glorious data taking LEP has been shut down. During the
past two years an incredible effort has been devoted to get more accurate
predictions and estimates of the related theoretical uncertainties. Many of the
theoretical questions driven by LEP are also relevant at the LC, where
predictions will be needed with even higher accuracy. This is particularly true
for 4-fermion Physics. In this contribution, I review some of the most
important theoretical achievements at LEP in understanding W and Z pair
production, 4-fermion + 1 visible photon signatures and in solving problems
related with gauge invariance. Issues on single W Physics are covered
elsewhere.
Part of the presented work is in progress, the final LEP2 analysis still
being under way.
| [
{
"created": "Sun, 27 May 2001 16:43:09 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Pittau",
"R.",
"",
"Turin U. & INFN, Turin"
]
] | After 12 years of glorious data taking LEP has been shut down. During the past two years an incredible effort has been devoted to get more accurate predictions and estimates of the related theoretical uncertainties. Many of the theoretical questions driven by LEP are also relevant at the LC, where predictions will be needed with even higher accuracy. This is particularly true for 4-fermion Physics. In this contribution, I review some of the most important theoretical achievements at LEP in understanding W and Z pair production, 4-fermion + 1 visible photon signatures and in solving problems related with gauge invariance. Issues on single W Physics are covered elsewhere. Part of the presented work is in progress, the final LEP2 analysis still being under way. |
hep-ph/0211231 | Luis Anchordoqui | Luis A. Anchordoqui, Diego F. Torres, Thomas P. McCauley, Gustavo E.
Romero, and Felix A. Aharonian | Neutrinos from Accreting Neutron Stars | 7 pages, 5 figures. Updates to match accepted version in Astrophys. J | Astrophys.J. 589 (2003) 481-486 | 10.1086/374551 | NUB-3235-TH-02 | hep-ph astro-ph hep-ex | null | The magnetospheres of accreting neutron stars develop electrostatic gaps with
huge potential drops. Protons and ions, accelerated in these gaps along the
dipolar magnetic field lines to energies greater than 100 TeV, can impact onto
a surrounding accretion disc. A proton-induced cascade so develops, and
$\nu$-emission is produced from charged pion decays. Using GEANT4, a computer
code that tracks particles produced in high energy collisions, we have
calculated the resulting $\nu$-spectrum with extensive disc shower simulations.
We show that the $\nu$-spectrum produced out of the proton beam is a power law.
We use this result to propose accretion-powered X-ray binaries (with highly
magnetized neutron stars) as a new population of point-like $\nu$-sources for
km-scale detectors, such as ICECUBE. As a particular example we discuss the
case of A0535+26. We show that ICECUBE should find A0535+26 to be a periodic
$\nu$-source: one for which the formation and loss of its accretion disc can be
fully detected. Finally, we briefly comment on the possibility that smaller
telescopes, like AMANDA, could also detect A0535+26 by folding observations
with the orbital period.
| [
{
"created": "Thu, 14 Nov 2002 21:02:12 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2003 17:11:03 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Torres",
"Diego F.",
""
],
[
"McCauley",
"Thomas P.",
""
],
[
"Romero",
"Gustavo E.",
""
],
[
"Aharonian",
"Felix A.",
""
]
] | The magnetospheres of accreting neutron stars develop electrostatic gaps with huge potential drops. Protons and ions, accelerated in these gaps along the dipolar magnetic field lines to energies greater than 100 TeV, can impact onto a surrounding accretion disc. A proton-induced cascade so develops, and $\nu$-emission is produced from charged pion decays. Using GEANT4, a computer code that tracks particles produced in high energy collisions, we have calculated the resulting $\nu$-spectrum with extensive disc shower simulations. We show that the $\nu$-spectrum produced out of the proton beam is a power law. We use this result to propose accretion-powered X-ray binaries (with highly magnetized neutron stars) as a new population of point-like $\nu$-sources for km-scale detectors, such as ICECUBE. As a particular example we discuss the case of A0535+26. We show that ICECUBE should find A0535+26 to be a periodic $\nu$-source: one for which the formation and loss of its accretion disc can be fully detected. Finally, we briefly comment on the possibility that smaller telescopes, like AMANDA, could also detect A0535+26 by folding observations with the orbital period. |
1008.0308 | Basudeb Dasgupta | Sandhya Choubey, Basudeb Dasgupta, Amol Dighe and Alessandro Mirizzi | Signatures of collective and matter effects on supernova neutrinos at
large detectors | 18 Pages, 5 figures and 4 tables | null | null | TIFR/TH/10-20 | hep-ph astro-ph.SR hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the expected galactic supernova neutrino signal at large
next-generation underground detectors. At different epochs after the explosion,
the primary fluxes can be quite different. For these primary neutrino fluxes,
spectral splits induced by collective neutrino flavor transformations can arise
for either mass hierarchy in both neutrino and antineutrino channels. We
classify flux models according to the nature and number of these splits, and
calculate the observable electron-neutrino and electron-antineutrino spectra at
Earth, taking into account subsequent matter effects. We find that some of the
spectral splits could occur sufficiently close to the peak energies to produce
significant distortions in the observable SN neutrino signal. The most striking
signature of this effect would be presence of peculiar energy dependent
modulations associated with Earth matter crossing, present only in portions of
the SN neutrino energy spectra demarcated by spectral splits. These signatures
at proposed large water Cherenkov, scintillation, and liquid Argon detectors
could give hints about the primary SN neutrino fluxes, as well as on the
neutrino mass hierarchy and the mixing angle theta_{13}.
| [
{
"created": "Mon, 2 Aug 2010 14:04:33 GMT",
"version": "v1"
}
] | 2010-08-03 | [
[
"Choubey",
"Sandhya",
""
],
[
"Dasgupta",
"Basudeb",
""
],
[
"Dighe",
"Amol",
""
],
[
"Mirizzi",
"Alessandro",
""
]
] | We calculate the expected galactic supernova neutrino signal at large next-generation underground detectors. At different epochs after the explosion, the primary fluxes can be quite different. For these primary neutrino fluxes, spectral splits induced by collective neutrino flavor transformations can arise for either mass hierarchy in both neutrino and antineutrino channels. We classify flux models according to the nature and number of these splits, and calculate the observable electron-neutrino and electron-antineutrino spectra at Earth, taking into account subsequent matter effects. We find that some of the spectral splits could occur sufficiently close to the peak energies to produce significant distortions in the observable SN neutrino signal. The most striking signature of this effect would be presence of peculiar energy dependent modulations associated with Earth matter crossing, present only in portions of the SN neutrino energy spectra demarcated by spectral splits. These signatures at proposed large water Cherenkov, scintillation, and liquid Argon detectors could give hints about the primary SN neutrino fluxes, as well as on the neutrino mass hierarchy and the mixing angle theta_{13}. |
2104.11369 | Lucas Johns | Lucas Johns | Collisional flavor instabilities of supernova neutrinos | 6 pages, 3 figures | Phys. Rev. Lett. 130, 191001 (2023) | 10.1103/PhysRevLett.130.191001 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A lingering mystery in core-collapse supernova theory is how collective
neutrino oscillations affect the dynamics. All previously identified flavor
instabilities, some of which might make the effects considerable, are
essentially collisionless phenomena. Here it is shown that collisional
instabilities exist as well. They are associated with asymmetries between the
neutrino and antineutrino interaction rates, are possibly prevalent deep inside
supernovae, and pose an unusual instance of decoherent interactions with a
thermal environment causing the sustained growth of quantum coherence.
| [
{
"created": "Fri, 23 Apr 2021 01:32:00 GMT",
"version": "v1"
},
{
"created": "Mon, 8 May 2023 16:23:36 GMT",
"version": "v2"
}
] | 2023-05-09 | [
[
"Johns",
"Lucas",
""
]
] | A lingering mystery in core-collapse supernova theory is how collective neutrino oscillations affect the dynamics. All previously identified flavor instabilities, some of which might make the effects considerable, are essentially collisionless phenomena. Here it is shown that collisional instabilities exist as well. They are associated with asymmetries between the neutrino and antineutrino interaction rates, are possibly prevalent deep inside supernovae, and pose an unusual instance of decoherent interactions with a thermal environment causing the sustained growth of quantum coherence. |
2408.07496 | Natasha Sharma | Peter Braun-Munzinger, Krzysztof Redlich, Natasha Sharma and Johanna
Stachel | Emergence of New Systematics for Open Charm Production in High Energy
Collisions | 10 pages, 7 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present the production systematics of open charm hadron yields in
high-energy collisions and their description based on the Statistical
Hadronization Model. The rapidity density of $D^0, D^+, D^{*+}, D_s^+$ mesons
and $\Lambda_c^+$ baryons in heavy ion and proton-proton collisions is analyzed
for different collision energies and centralities. The Statistical
Hadronization Model is extended to open charm production in minimum-bias and
high-multiplicity pp collisions. In this context, we use the link established
in [1], see also the further development in [2], between the rapidity density
of open charm hadron yields, $dN_i/dy$, and the rapidity density of
charm-anticharm quark pairs, $dN_{c\bar c}/d\eta$ to demonstrate that, in pp,
pA and AA collisions, $dN_i/dy$ scales in leading order with $dN_{c\bar
c}/d\eta$ and the slope coefficient is quantified by the appropriate thermal
density ratio calculated at the chiral crossover temperature, $T_c=156.5$ MeV.
It is also shown that, in high energy collisions and within uncertainties,
$dN_i/dy$ exhibits the power-law scaling with the charged-particle
pseudo-rapidity density. Furthermore, presently available data on different
ratios of open charm rapidity densities in high-energy collisions are
independent of collision energy and system size, as expected in the Statistical
Hadronization Model.
| [
{
"created": "Wed, 14 Aug 2024 12:21:21 GMT",
"version": "v1"
}
] | 2024-08-15 | [
[
"Braun-Munzinger",
"Peter",
""
],
[
"Redlich",
"Krzysztof",
""
],
[
"Sharma",
"Natasha",
""
],
[
"Stachel",
"Johanna",
""
]
] | We present the production systematics of open charm hadron yields in high-energy collisions and their description based on the Statistical Hadronization Model. The rapidity density of $D^0, D^+, D^{*+}, D_s^+$ mesons and $\Lambda_c^+$ baryons in heavy ion and proton-proton collisions is analyzed for different collision energies and centralities. The Statistical Hadronization Model is extended to open charm production in minimum-bias and high-multiplicity pp collisions. In this context, we use the link established in [1], see also the further development in [2], between the rapidity density of open charm hadron yields, $dN_i/dy$, and the rapidity density of charm-anticharm quark pairs, $dN_{c\bar c}/d\eta$ to demonstrate that, in pp, pA and AA collisions, $dN_i/dy$ scales in leading order with $dN_{c\bar c}/d\eta$ and the slope coefficient is quantified by the appropriate thermal density ratio calculated at the chiral crossover temperature, $T_c=156.5$ MeV. It is also shown that, in high energy collisions and within uncertainties, $dN_i/dy$ exhibits the power-law scaling with the charged-particle pseudo-rapidity density. Furthermore, presently available data on different ratios of open charm rapidity densities in high-energy collisions are independent of collision energy and system size, as expected in the Statistical Hadronization Model. |
1703.07136 | Sushant Raut | Sushant K. Raut | Matter effects at the T2HK and T2HKK experiments | Version accepted for publication in Phys. Rev. D (Originally titled
"T2HK and T2HKK: Does more matter matter?", changed at insistence of the
editorial team.) | Phys. Rev. D 96, 075029 (2017) | 10.1103/PhysRevD.96.075029 | CTPU-17-10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Determining the neutrino mass hierarchy and measuring the CP-violating phase
$\delta_{CP}$ are two of the main aims in neutrino physics today. The upcoming
T2HK (with small matter effects and high statistics) and DUNE (with large
matter effects) experiments have been shown to have excellent sensitivity to
$\delta_{CP}$ and the neutrino mass hierarchy, respectively. The recent T2HKK
proposal aims to improve the hierarchy sensitivity of T2HK by placing one of
the two tanks of the HK detector at a site in Korea, to collect data at $\sim
1100$ km baseline. In light of the fact that DUNE will anyway collect data at
$\sim 1300$ km, we explore whether it is advantageous to collect additional
long-baseline data as proposed with T2HKK, or to enhance the
$\delta_{CP}$-precision with the `conventional' T2HK by keeping both detector
tanks in Japan. We do this by comparing the physics reach of these two options
in conjunction with DUNE. We find that DUNE+T2HKK is better at excluding the
wrong hierarchy, reaching $\Delta\chi^2 > 175$ irrespective of the true
parameters. While DUNE+T2HK can measure $\delta_{CP}$ with more precision in
some parts of the parameter space, both DUNE+T2HK and DUNE+T2HKK perform
equally well near the current best-fit point, giving a $\delta_{CP}$ width of
around $15^\circ$. The T2HKK setup allows us to correlate and constrain the
systematic errors between the two detectors collecting data from the same
source, which can increase the sensitivity of the experiment by up to 25\%.
Such a reduction of the systematic errors is crucial for determining the
oscillation parameters with greater significance.
| [
{
"created": "Tue, 21 Mar 2017 10:44:07 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2017 08:55:59 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Raut",
"Sushant K.",
""
]
] | Determining the neutrino mass hierarchy and measuring the CP-violating phase $\delta_{CP}$ are two of the main aims in neutrino physics today. The upcoming T2HK (with small matter effects and high statistics) and DUNE (with large matter effects) experiments have been shown to have excellent sensitivity to $\delta_{CP}$ and the neutrino mass hierarchy, respectively. The recent T2HKK proposal aims to improve the hierarchy sensitivity of T2HK by placing one of the two tanks of the HK detector at a site in Korea, to collect data at $\sim 1100$ km baseline. In light of the fact that DUNE will anyway collect data at $\sim 1300$ km, we explore whether it is advantageous to collect additional long-baseline data as proposed with T2HKK, or to enhance the $\delta_{CP}$-precision with the `conventional' T2HK by keeping both detector tanks in Japan. We do this by comparing the physics reach of these two options in conjunction with DUNE. We find that DUNE+T2HKK is better at excluding the wrong hierarchy, reaching $\Delta\chi^2 > 175$ irrespective of the true parameters. While DUNE+T2HK can measure $\delta_{CP}$ with more precision in some parts of the parameter space, both DUNE+T2HK and DUNE+T2HKK perform equally well near the current best-fit point, giving a $\delta_{CP}$ width of around $15^\circ$. The T2HKK setup allows us to correlate and constrain the systematic errors between the two detectors collecting data from the same source, which can increase the sensitivity of the experiment by up to 25\%. Such a reduction of the systematic errors is crucial for determining the oscillation parameters with greater significance. |
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