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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0501096 | Klaus Desch | Klaus Desch | Supersymmetry at LHC and ILC | 19 pages - to appear in Proceedings of the SLAC Summer Institute 2004 | null | null | null | hep-ph | null | The prospects for the discovery and exploration of low-energy Supersymmetry
at future colliders, the Large Hadron Collider (LHC) and the future
international linear electron positron collider (ILC) are summarized. The focus
is on the experimental techniques that will be used to discover superpartners
and to measure their properties. Special attention is given to the question how
the results from both machines could influence each other, in particular when
they have overlapping running time.
| [
{
"created": "Wed, 12 Jan 2005 13:20:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Desch",
"Klaus",
""
]
] | The prospects for the discovery and exploration of low-energy Supersymmetry at future colliders, the Large Hadron Collider (LHC) and the future international linear electron positron collider (ILC) are summarized. The focus is on the experimental techniques that will be used to discover superpartners and to measure their properties. Special attention is given to the question how the results from both machines could influence each other, in particular when they have overlapping running time. |
1005.0708 | Martin Spinrath | Stefan Antusch, Stephen F. King, Martin Spinrath | Measurable Neutrino Mass Scale in A4 x SU(5) | 22 pages, 5 figures; published version | Phys.Rev.D83:013005,2011 | 10.1103/PhysRevD.83.013005 | MPP-2010-52 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a supersymmetric A4 x SU(5) model of quasi-degenerate neutrinos
which predicts the effective neutrino mass m_ee relevant for neutrinoless
double beta decay to be proportional to the neutrino mass scale, thereby
allowing its determination approximately independently of unknown Majorana
phases. Such a natural quasi-degeneracy is achieved by using the A4 (as an
example of a non-Abelian family symmetry with real triplet representations) to
enforce a type II seesaw contribution to the neutrino mass matrix proportional
to the identity. Tri-bimaximal neutrino mixing arises from a type I seesaw
contribution via A4 family symmetry and constrained sequential dominance. We
perform a numerical fit to the quark and lepton masses and quark mixing where a
simple ansatz describing quark CP violation with alpha approximately 90 degrees
also leads to the leptonic phase prediction delta_MNS approximately 90 degrees.
| [
{
"created": "Wed, 5 May 2010 09:33:15 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2011 11:54:33 GMT",
"version": "v2"
}
] | 2011-04-01 | [
[
"Antusch",
"Stefan",
""
],
[
"King",
"Stephen F.",
""
],
[
"Spinrath",
"Martin",
""
]
] | We propose a supersymmetric A4 x SU(5) model of quasi-degenerate neutrinos which predicts the effective neutrino mass m_ee relevant for neutrinoless double beta decay to be proportional to the neutrino mass scale, thereby allowing its determination approximately independently of unknown Majorana phases. Such a natural quasi-degeneracy is achieved by using the A4 (as an example of a non-Abelian family symmetry with real triplet representations) to enforce a type II seesaw contribution to the neutrino mass matrix proportional to the identity. Tri-bimaximal neutrino mixing arises from a type I seesaw contribution via A4 family symmetry and constrained sequential dominance. We perform a numerical fit to the quark and lepton masses and quark mixing where a simple ansatz describing quark CP violation with alpha approximately 90 degrees also leads to the leptonic phase prediction delta_MNS approximately 90 degrees. |
hep-ph/0110008 | D. M. Ghilencea | D.M. Ghilencea | A note on two-loop effects in the DMSSM | 10 pages, 6 figures, LaTeX | Nucl.Phys. B622 (2002) 215-226 | 10.1016/S0550-3213(01)00593-4 | null | hep-ph | null | We investigate the proposed ``D-brane alternative'' to the MSSM model (DMSSM)
which is a type II B string orientifold model with N=1 supersymmetry, three
generations and a $SU(3)\times SU(2)_R\times SU(2)_L \times U(1)_{B-L}$ gauge
group. An accurate analysis at two-loop level is performed to show that
unification constraints predict a ``left-right'' symmetry breaking scale in the
TeV region. The exact value of this scale is the result of the competing
effects of the two loop terms against the low energy supersymmetric threshold
effects. The model accommodates logarithmic unification of the gauge couplings
at an intermediate scale of $10^{12}$ GeV and the necessary conditions to
achieve this are addressed.
| [
{
"created": "Sat, 29 Sep 2001 14:20:21 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ghilencea",
"D. M.",
""
]
] | We investigate the proposed ``D-brane alternative'' to the MSSM model (DMSSM) which is a type II B string orientifold model with N=1 supersymmetry, three generations and a $SU(3)\times SU(2)_R\times SU(2)_L \times U(1)_{B-L}$ gauge group. An accurate analysis at two-loop level is performed to show that unification constraints predict a ``left-right'' symmetry breaking scale in the TeV region. The exact value of this scale is the result of the competing effects of the two loop terms against the low energy supersymmetric threshold effects. The model accommodates logarithmic unification of the gauge couplings at an intermediate scale of $10^{12}$ GeV and the necessary conditions to achieve this are addressed. |
hep-ph/0111188 | Jian-jun Yang | Jian-Jun Yang (Santa Maria U. & Nanjing Normal U.) | Quark Fragmentation Functions in a Diquark Model for $\Lambda$
Production | A reference is added to the published version | Phys.Rev. D64 (2001) 074010 | 10.1103/PhysRevD.64.074010 | USM-TH-116 | hep-ph | null | Using a simple quark-diquark model, we extract a set of unpolarized and
polarized fragmentation functions for the $\Lambda$ based on the available
unpolarized $\Lambda$ production data in $e^+ e ^- $ annihilation. It is found
that there is a strong SU(3) flavor symmetry breaking in the unpolarized
$\Lambda$ fragmentation functions and that the polarized $u$ and $d$ quark
contributions to the polarized $\Lambda$ fragmentation are positive in medium
and large $z$ region. The predictions of $\Lambda$-polarization with the
obtained quark fragmentation functions are compatible with the available data
on the longitudinally polarized $\Lambda$ produced in $e^+e^-$-annihilation,
polarized charged lepton deep inelastic scattering (DIS), and neutrino DIS. The
spin asymmetry for the $\Lambda$ production in $p\vec{p}$ collisions is also
predicted for a future test in experiments at RHIC-BNL.
| [
{
"created": "Thu, 15 Nov 2001 13:56:12 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Yang",
"Jian-Jun",
"",
"Santa Maria U. & Nanjing Normal U."
]
] | Using a simple quark-diquark model, we extract a set of unpolarized and polarized fragmentation functions for the $\Lambda$ based on the available unpolarized $\Lambda$ production data in $e^+ e ^- $ annihilation. It is found that there is a strong SU(3) flavor symmetry breaking in the unpolarized $\Lambda$ fragmentation functions and that the polarized $u$ and $d$ quark contributions to the polarized $\Lambda$ fragmentation are positive in medium and large $z$ region. The predictions of $\Lambda$-polarization with the obtained quark fragmentation functions are compatible with the available data on the longitudinally polarized $\Lambda$ produced in $e^+e^-$-annihilation, polarized charged lepton deep inelastic scattering (DIS), and neutrino DIS. The spin asymmetry for the $\Lambda$ production in $p\vec{p}$ collisions is also predicted for a future test in experiments at RHIC-BNL. |
1512.02094 | Frank Wilczek | Frank Wilczek | Unification of Force and Substance | Talk at Royal Society Symposium, "Unifying Physics and Technology in
the Light of Maxwell's Equations", November 2015. 26 pages, no figures | null | 10.1098/rsta.2015.0257 | null | hep-ph hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Maxwell's mature presentation of his equations emphasized the unity of
electromagnetism and mechanics, subsuming both as "dynamical systems". That
intuition of unity has proved both fruitful, as a source of pregnant concepts,
and broadly inspiring. A deep aspect of Maxwell's work is its use of redundant
potentials, and the associated requirement of gauge symmetry. Those concepts
have become central to our present understanding of fundamental physics, but
they can appear to be rather formal and esoteric. Here I discuss two things:
The physical significance of gauge invariance, in broad terms; and some
tantalizing prospects for further unification, building on that concept, that
are visible on the horizon today. If those prospects are realized, Maxwell's
vision of the unity of field and substance will be brought to a new level.
| [
{
"created": "Mon, 7 Dec 2015 15:41:04 GMT",
"version": "v1"
}
] | 2016-09-28 | [
[
"Wilczek",
"Frank",
""
]
] | Maxwell's mature presentation of his equations emphasized the unity of electromagnetism and mechanics, subsuming both as "dynamical systems". That intuition of unity has proved both fruitful, as a source of pregnant concepts, and broadly inspiring. A deep aspect of Maxwell's work is its use of redundant potentials, and the associated requirement of gauge symmetry. Those concepts have become central to our present understanding of fundamental physics, but they can appear to be rather formal and esoteric. Here I discuss two things: The physical significance of gauge invariance, in broad terms; and some tantalizing prospects for further unification, building on that concept, that are visible on the horizon today. If those prospects are realized, Maxwell's vision of the unity of field and substance will be brought to a new level. |
2305.08980 | Celso C. Nishi | C. C. Nishi, J. I. Silva-Marcos | Leptonic CP violation from the seesaw | 29pp, 8 figures. To appear in PRD | Phys. Rev. D 108, 095031, 2023 | 10.1103/PhysRevD.108.095031 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The seesaw extension of the SM explains the tiny neutrino masses and it is
accompanied by many CP violating phases. We study the case where all leptonic
CP violation arises from the soft breaking in the heavy Majorana mass matrix.
Parameter counting reveals that one less parameter is needed to describe this
case. This reduction leads to restrictions on the parameter space of heavy
neutrinos. We analyze the minimal seesaw case in detail and find that mass
degeneracy of heavy neutrinos is not possible for certain values of the CP
phases.
| [
{
"created": "Mon, 15 May 2023 19:42:57 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2023 17:53:09 GMT",
"version": "v2"
}
] | 2023-11-20 | [
[
"Nishi",
"C. C.",
""
],
[
"Silva-Marcos",
"J. I.",
""
]
] | The seesaw extension of the SM explains the tiny neutrino masses and it is accompanied by many CP violating phases. We study the case where all leptonic CP violation arises from the soft breaking in the heavy Majorana mass matrix. Parameter counting reveals that one less parameter is needed to describe this case. This reduction leads to restrictions on the parameter space of heavy neutrinos. We analyze the minimal seesaw case in detail and find that mass degeneracy of heavy neutrinos is not possible for certain values of the CP phases. |
hep-ph/0408186 | Guray Erkol | Guray Erkol, Gursevil Turan, Jan Willem Wagenaar | CP violation in polarized B-> pi ell+ ell- and B-> rho ell+ ell- decays | 24 pages, 10 figures; minor errors and misprints corrected,
references added, version to be published in EPJC | Eur.Phys.J.C41:189-198,2005 | 10.1140/epjc/s2005-02197-9 | null | hep-ph | null | We study the decay rate and the CP violating asymmetry of the exclusive B->
pi ell+ ell- and B-> rho ell+ ell- decays in the case where one of the final
leptons is polarized. We calculate the contributions coming from the individual
polarization states in order to identify a so-called wrong sign decay, which is
a decay with a given polarization, whose width and CP asymmetry are smaller as
compared to the unpolarized one. The results are presented for electron and tau
leptons. We observe that in particular decay channels, one can identify a wrong
sign decay which is more sensitive to new physics beyond the Standard Model.
| [
{
"created": "Tue, 17 Aug 2004 13:27:10 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2005 22:17:56 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Erkol",
"Guray",
""
],
[
"Turan",
"Gursevil",
""
],
[
"Wagenaar",
"Jan Willem",
""
]
] | We study the decay rate and the CP violating asymmetry of the exclusive B-> pi ell+ ell- and B-> rho ell+ ell- decays in the case where one of the final leptons is polarized. We calculate the contributions coming from the individual polarization states in order to identify a so-called wrong sign decay, which is a decay with a given polarization, whose width and CP asymmetry are smaller as compared to the unpolarized one. The results are presented for electron and tau leptons. We observe that in particular decay channels, one can identify a wrong sign decay which is more sensitive to new physics beyond the Standard Model. |
1707.02536 | Xuyang Liu | X.Y. Liu, A. Limphirat, K. Xu, D. Samart, K. Khosonthongkee and Y. Yan | Analysis of excited quark propagator effects on neutron charge form
factor | 8 pages, 8 figures | Eur. Phys. J. A (2019) 55: 218 | 10.1140/epja/i2019-12913-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The charge form factor and charge radius of neutron are investigated in the
perturbative chiral quark model (PCQM) with considering both the ground and
excited states in the quark propagator. A Cornell-like potential is extracted
in accordance with the predetermined ground state quark wavefunction, and the
excited quark states are derived by solving the Dirac equation with the
extracted PCQM potential numerically. The study reveals that the contributions
of the excited quark states are considerably influential in the charge form
factor and charge radius of neutron as expected, and the total results are
significantly improved and increased by nearly four times by including the
excited states in the quark propagator. The theoretical PCQM results are found,
including the ground and excited quark propagators, in good agreement with the
recent lattice QCD values at pion mass of about 130 MeV.
| [
{
"created": "Sun, 9 Jul 2017 07:46:39 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2017 04:14:53 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Nov 2019 06:55:14 GMT",
"version": "v3"
}
] | 2019-11-25 | [
[
"Liu",
"X. Y.",
""
],
[
"Limphirat",
"A.",
""
],
[
"Xu",
"K.",
""
],
[
"Samart",
"D.",
""
],
[
"Khosonthongkee",
"K.",
""
],
[
"Yan",
"Y.",
""
]
] | The charge form factor and charge radius of neutron are investigated in the perturbative chiral quark model (PCQM) with considering both the ground and excited states in the quark propagator. A Cornell-like potential is extracted in accordance with the predetermined ground state quark wavefunction, and the excited quark states are derived by solving the Dirac equation with the extracted PCQM potential numerically. The study reveals that the contributions of the excited quark states are considerably influential in the charge form factor and charge radius of neutron as expected, and the total results are significantly improved and increased by nearly four times by including the excited states in the quark propagator. The theoretical PCQM results are found, including the ground and excited quark propagators, in good agreement with the recent lattice QCD values at pion mass of about 130 MeV. |
2010.13376 | Leon Friedrich | Nicole F. Bell, Matthew J. Dolan, Leon S. Friedrich, Michael J.
Ramsey-Musolf, Raymond R. Volkas | A Real Triplet-Singlet Extended Standard Model: Dark Matter and Collider
Phenomenology | 32 pages, 8 figures. Updated to match version published in JHEP | J. High Energ. Phys. 2021, 98 (2021) | 10.1007/JHEP04(2021)098 | ACFI T20-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the collider and dark matter phenomenology of the Standard Model
extended by a hypercharge-zero SU(2) triplet scalar and gauge singlet scalar.
In particular, we study the scenario where the singlet and triplet are both
charged under a single $\mathbb{Z}_2$ symmetry. We find that such an extension
is capable of generating the observed dark matter density, while also modifying
the collider phenomenology such that the lower bound on the mass of the triplet
is smaller than in minimal triplet scalar extensions to the Standard Model. A
high triplet mass is in tension with the parameter space that leads to novel
electroweak phase transitions in the early universe. Therefore, the lower
triplet masses that are permitted in this extended model are of particular
importance for the prospects of successful electroweak baryogenesis and the
generation of gravitational waves from early universe phase transitions.
| [
{
"created": "Mon, 26 Oct 2020 07:04:46 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Nov 2020 23:40:58 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Apr 2021 02:47:05 GMT",
"version": "v3"
}
] | 2021-04-20 | [
[
"Bell",
"Nicole F.",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"Friedrich",
"Leon S.",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] | We examine the collider and dark matter phenomenology of the Standard Model extended by a hypercharge-zero SU(2) triplet scalar and gauge singlet scalar. In particular, we study the scenario where the singlet and triplet are both charged under a single $\mathbb{Z}_2$ symmetry. We find that such an extension is capable of generating the observed dark matter density, while also modifying the collider phenomenology such that the lower bound on the mass of the triplet is smaller than in minimal triplet scalar extensions to the Standard Model. A high triplet mass is in tension with the parameter space that leads to novel electroweak phase transitions in the early universe. Therefore, the lower triplet masses that are permitted in this extended model are of particular importance for the prospects of successful electroweak baryogenesis and the generation of gravitational waves from early universe phase transitions. |
hep-ph/0701035 | Yanou Cui | Matthew Bowen, Yanou Cui, James Wells | Narrow Trans-TeV Higgs Bosons and $H\to hh$ Decays: Two LHC Search Paths
for a Hidden Sector Higgs Boson | 21 pages, 5 figures | JHEP 0703:036,2007 | 10.1088/1126-6708/2007/03/036 | MCTP-07-02 | hep-ph | null | We consider the addition of a condensing singlet scalar field to the Standard
Model. Such a scenario may be motivated by any number of theoretical ideas,
including the common result in string-inspired model building of singlet scalar
fields charged under some hidden sector gauge symmetry. For concreteness, we
specify an example model of this type, and consider the relevant constraints on
Higgs physics, such as triviality, perturbative unitarity and precision
electroweak analysis. We then show that there are two unique features of the
phenomenology that present opportunities for discovery at the Large Hadron
Collider (LHC). First, it is possible to identify and discover a narrow
trans-TeV Higgs boson in this scenario -- a mass scale that is well above the
scale at which it is meaningful to discuss a SM Higgs boson. Second, the decays
of the heavier scalar state into the lighter Higgs bosons can proceed at a high
rate and may be the first discovery mode in the Higgs sector.
| [
{
"created": "Thu, 4 Jan 2007 21:53:03 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Bowen",
"Matthew",
""
],
[
"Cui",
"Yanou",
""
],
[
"Wells",
"James",
""
]
] | We consider the addition of a condensing singlet scalar field to the Standard Model. Such a scenario may be motivated by any number of theoretical ideas, including the common result in string-inspired model building of singlet scalar fields charged under some hidden sector gauge symmetry. For concreteness, we specify an example model of this type, and consider the relevant constraints on Higgs physics, such as triviality, perturbative unitarity and precision electroweak analysis. We then show that there are two unique features of the phenomenology that present opportunities for discovery at the Large Hadron Collider (LHC). First, it is possible to identify and discover a narrow trans-TeV Higgs boson in this scenario -- a mass scale that is well above the scale at which it is meaningful to discuss a SM Higgs boson. Second, the decays of the heavier scalar state into the lighter Higgs bosons can proceed at a high rate and may be the first discovery mode in the Higgs sector. |
0912.1446 | Asmita Mukherjee | Asmita Mukherjee | Twist Three Distribution e(x) : Sum Rules and Equation of Motion
Relations | genuine twist three part added, conclusions on sum rules and equation
of motion unchanged | Phys.Lett.B687:180-183,2010 | 10.1016/j.physletb.2010.03.023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the twist three distribution function $e(x)$ in light-front
Hamiltonian perturbation theory. In light-front gauge, by eliminating the
constrained field, we find a mass term, an intrinsic transverse momentum
dependent term and a 'genuine twist three' quark-gluon interaction term in the
operator. The equation of motion relation, moment relation and the sum rules
are satisfied for a quark at one loop. We compare the results with other model
calculations.
| [
{
"created": "Tue, 8 Dec 2009 09:32:34 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2010 03:54:19 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Mukherjee",
"Asmita",
""
]
] | We investigate the twist three distribution function $e(x)$ in light-front Hamiltonian perturbation theory. In light-front gauge, by eliminating the constrained field, we find a mass term, an intrinsic transverse momentum dependent term and a 'genuine twist three' quark-gluon interaction term in the operator. The equation of motion relation, moment relation and the sum rules are satisfied for a quark at one loop. We compare the results with other model calculations. |
hep-ph/0606060 | Thomas Schwetz | Thomas Schwetz | Global fits to neutrino oscillation data | 5 pages, 5 figures, talk presented at the SNOW2006 workshop,
Stockholm, 2-6 May 2006 | Phys.ScriptaT127:1-5,2006 | 10.1088/0031-8949/2006/T127/001 | SISSA 31/2006/EP | hep-ph | null | I summarize the determination of neutrino oscillation parameters within the
three-flavor framework from world neutrino oscillation data with date of May
2006, including the first results from the MINOS long-baseline experiment. It
is illustrated how the determination of the leading "solar" and "atmospheric"
parameters, as well as the bound on $\theta_{13}$ emerge from an interplay of
various complementary data sets. Furthermore, I discuss possible implications
of sub-leading three-flavor effects in present atmospheric neutrino data
induced by $\Delta m^2_{21}$ and $\theta_{13}$ for the bound on $\theta_{13}$
and non-maximal values of $\theta_{23}$, emphasizing, however, that these
effects are not statistically significant at present. Finally, in view of the
upcoming MiniBooNE results I briefly comment on the problem to reconcile the
LSND signal.
| [
{
"created": "Tue, 6 Jun 2006 10:39:14 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Schwetz",
"Thomas",
""
]
] | I summarize the determination of neutrino oscillation parameters within the three-flavor framework from world neutrino oscillation data with date of May 2006, including the first results from the MINOS long-baseline experiment. It is illustrated how the determination of the leading "solar" and "atmospheric" parameters, as well as the bound on $\theta_{13}$ emerge from an interplay of various complementary data sets. Furthermore, I discuss possible implications of sub-leading three-flavor effects in present atmospheric neutrino data induced by $\Delta m^2_{21}$ and $\theta_{13}$ for the bound on $\theta_{13}$ and non-maximal values of $\theta_{23}$, emphasizing, however, that these effects are not statistically significant at present. Finally, in view of the upcoming MiniBooNE results I briefly comment on the problem to reconcile the LSND signal. |
hep-ph/9506342 | Niels R. Walet | Atsushi Hosaka (Numazu, Japan) and Niels R. Walet (Erlangen, Germany) | The large-$N_c$ limit and the behavior of $g_A^{(0)}$ and $g_A$ | 10 pages. One ps figure, which can be included in the text using
epsf.sty. Ps file for complete document obtainable at
ftp://theorie3.physik.uni-erlangen.de/pub/publications/largeNgA.ps.gz | Phys.Lett. B358 (1995) 184-190 | 10.1016/0370-2693(95)01024-K | FAU-TP3-95/6 | hep-ph | null | We investigate the isoscalar and isovector components of the axial vector
coupling constants, $g_A^{(0)}$ and $g_A$, using algebraic models that lead to
the correct symmetries of large-$N_c$ QCD. Results obtained previously in
various chiral models are interpreted from this algebraic point of view. The
results of the Skyrme model and the valence quark model are explained by simple
realizations of the algebra.
| [
{
"created": "Fri, 16 Jun 1995 08:37:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Hosaka",
"Atsushi",
"",
"Numazu, Japan"
],
[
"Walet",
"Niels R.",
"",
"Erlangen, Germany"
]
] | We investigate the isoscalar and isovector components of the axial vector coupling constants, $g_A^{(0)}$ and $g_A$, using algebraic models that lead to the correct symmetries of large-$N_c$ QCD. Results obtained previously in various chiral models are interpreted from this algebraic point of view. The results of the Skyrme model and the valence quark model are explained by simple realizations of the algebra. |
hep-ph/9907526 | Lianshou Liu | Zheng Xiaoping, Li Jiarong, Liu Lianggang, Guo Shuohong | An effective relaxation-time approach to collisionless quark-gluon
plasma | 5 pages | null | null | HZPP-9905 | hep-ph | null | We present an effective relaxation-time theory to study the collisionless
quark-gluon plasma. Applying this method we calculate the damping rate to be of
order $g^2T$ and find plasmon scattering is the damping mechanism. The damping
for the transverse mode is stronger than the longitudinal one.
| [
{
"created": "Wed, 28 Jul 1999 03:46:44 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Xiaoping",
"Zheng",
""
],
[
"Jiarong",
"Li",
""
],
[
"Lianggang",
"Liu",
""
],
[
"Shuohong",
"Guo",
""
]
] | We present an effective relaxation-time theory to study the collisionless quark-gluon plasma. Applying this method we calculate the damping rate to be of order $g^2T$ and find plasmon scattering is the damping mechanism. The damping for the transverse mode is stronger than the longitudinal one. |
hep-ph/0008015 | Zhang Chen | Zhang Chen | Deeply Virtual Compton Scattering and Skewed Parton Distribution | Contribution to the proceedings of the 7th Conference on the
Intersections of Particle and Nuclear Physics (CIPANP 2000), Quebec City,
Canada, May 22 - 28, 2000 | AIP Conf.Proc. 549 (2002) 514-519 | 10.1063/1.1345308 | null | hep-ph | null | An overview of the current status of and possible future theoretical,
phenomenological and experimental studies of DVCS and SPD's is presented.
| [
{
"created": "Wed, 2 Aug 2000 08:06:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chen",
"Zhang",
""
]
] | An overview of the current status of and possible future theoretical, phenomenological and experimental studies of DVCS and SPD's is presented. |
1209.0499 | Keith Olive | Emilian Dudas, Andrei Linde, Yann Mambrini, Azar Mustafayev, and Keith
A. Olive | Strong moduli stabilization and phenomenology | 21 pages, 7 figures, final version with updated Figures 2 and 3 | null | 10.1140/epjc/s10052-012-2268-7 | CERN-PH-TH/2012-228; CPHT-RR069.0812; UMN-TH-3116/12;
FTPI-MINN-12/28; LPT-Orsay-12-92; UH-511-1199-12 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the resulting phenomenology of string theory/supergravity models
with strong moduli stabilization. The KL model with F-term uplifting, is one
such example. Models of this type predict universal scalar masses equal to the
gravitino mass. In contrast, A-terms receive highly suppressed gravity mediated
contributions. Under certain conditions, the same conclusion is valid for
gaugino masses, which like A-terms, are then determined by anomalies. In such
models, we are forced to relatively large gravitino masses (30-1000 TeV). We
compute the low energy spectrum as a function of m_{3/2}. We see that the Higgs
masses naturally takes values between 125-130 GeV. The lower limit is obtained
from the requirement of chargino masses greater than 104 GeV, while the upper
limit is determined by the relic density of dark matter (wino-like).
| [
{
"created": "Mon, 3 Sep 2012 23:04:47 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2013 16:28:56 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Dudas",
"Emilian",
""
],
[
"Linde",
"Andrei",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Mustafayev",
"Azar",
""
],
[
"Olive",
"Keith A.",
""
]
] | We describe the resulting phenomenology of string theory/supergravity models with strong moduli stabilization. The KL model with F-term uplifting, is one such example. Models of this type predict universal scalar masses equal to the gravitino mass. In contrast, A-terms receive highly suppressed gravity mediated contributions. Under certain conditions, the same conclusion is valid for gaugino masses, which like A-terms, are then determined by anomalies. In such models, we are forced to relatively large gravitino masses (30-1000 TeV). We compute the low energy spectrum as a function of m_{3/2}. We see that the Higgs masses naturally takes values between 125-130 GeV. The lower limit is obtained from the requirement of chargino masses greater than 104 GeV, while the upper limit is determined by the relic density of dark matter (wino-like). |
2008.12795 | Ye-Ling Zhou | Shyam Balaji, Maura Ramirez-Quezada and Ye-Ling Zhou | CP violation in neutral lepton transition dipole moment | 15 pages, 3 figures, title updated and refs added, published in JHEP | JHEP12 (2020) 090 | 10.1007/JHEP12(2020)090 | IPPP/20/38 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $CP$ violation in the neutrino transition electromagnetic dipole moment
is discussed in the context of the Standard Model with an arbitrary number of
right-handed singlet neutrinos. A full one-loop calculation of the neutrino
electromagnetic form factors is performed in the Feynman gauge. A non-zero $CP$
asymmetry is generated by a required threshold condition for the neutrino
masses along with non-vanishing $CP$ violating phases in the lepton flavour
mixing matrix. We follow the paradiagm of $CP$ violation in neutrino
oscillations to parametrise the flavour mixing contribution into a series of
Jarlskog-like parameters. This formalism is then applied to a minimal seesaw
model with two heavy right-handed neutrinos denoted $N_1$ and $N_2$. We observe
that the $CP$ asymmetries for decays into light neutrinos $N\to \nu\gamma$ are
extremely suppressed, maximally around $10^{-17}$. However the $CP$ asymmetry
for $N_2 \to N_1 \gamma$ can reach of order unity. Even if the Dirac $CP$ phase
$\delta$ is the only source of $CP$ violation, a large $CP$ asymmetry around
$10^{-5}$-$10^{-3}$ is comfortably achieved.
| [
{
"created": "Fri, 28 Aug 2020 18:01:02 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Dec 2020 12:30:46 GMT",
"version": "v2"
}
] | 2020-12-29 | [
[
"Balaji",
"Shyam",
""
],
[
"Ramirez-Quezada",
"Maura",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] | The $CP$ violation in the neutrino transition electromagnetic dipole moment is discussed in the context of the Standard Model with an arbitrary number of right-handed singlet neutrinos. A full one-loop calculation of the neutrino electromagnetic form factors is performed in the Feynman gauge. A non-zero $CP$ asymmetry is generated by a required threshold condition for the neutrino masses along with non-vanishing $CP$ violating phases in the lepton flavour mixing matrix. We follow the paradiagm of $CP$ violation in neutrino oscillations to parametrise the flavour mixing contribution into a series of Jarlskog-like parameters. This formalism is then applied to a minimal seesaw model with two heavy right-handed neutrinos denoted $N_1$ and $N_2$. We observe that the $CP$ asymmetries for decays into light neutrinos $N\to \nu\gamma$ are extremely suppressed, maximally around $10^{-17}$. However the $CP$ asymmetry for $N_2 \to N_1 \gamma$ can reach of order unity. Even if the Dirac $CP$ phase $\delta$ is the only source of $CP$ violation, a large $CP$ asymmetry around $10^{-5}$-$10^{-3}$ is comfortably achieved. |
1706.04514 | Tom\'a\v{s} Brauner | Tomas Brauner and Saurabh Kadam | Anomalous low-temperature thermodynamics of QCD in strong magnetic
fields | 1+19 pages, v2: matches published version | JHEP11(2017)103 | 10.1007/JHEP11(2017)103 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamics of quantum chromodynamics at low temperatures and in
sufficiently strong magnetic fields is governed by neutral pions. We analyze
the interacting system of neutral pions and photons at zero baryon chemical
potential using effective field theory. As a consequence of the axial anomaly
and the external magnetic field, the pions and photons mix with one another.
The resulting spectrum contains one usual, relativistic photon state, and two
nonrelativistic modes, one of which is gapless and the other gapped.
Furthermore, we calculate the leading, one-loop contribution to the pressure of
the system. In the chiral limit, a closed analytic expression for the pressure
exists, which features an unusual scaling with temperature and magnetic field,
$T^3B/f_\pi$, at low temperatures, $T\ll B/f_\pi$. Finally, we determine the
pion decay rate as a function of the magnetic field at the tree level. The
result is affected by a competition of the anisotropic kinematics and the
enlarged phase space due to the anomalous mass of the neutral pion. In the
chiral limit, the decay rate scales as $B^3/f_\pi^5$.
| [
{
"created": "Wed, 14 Jun 2017 14:31:43 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2017 10:10:29 GMT",
"version": "v2"
}
] | 2017-11-20 | [
[
"Brauner",
"Tomas",
""
],
[
"Kadam",
"Saurabh",
""
]
] | The thermodynamics of quantum chromodynamics at low temperatures and in sufficiently strong magnetic fields is governed by neutral pions. We analyze the interacting system of neutral pions and photons at zero baryon chemical potential using effective field theory. As a consequence of the axial anomaly and the external magnetic field, the pions and photons mix with one another. The resulting spectrum contains one usual, relativistic photon state, and two nonrelativistic modes, one of which is gapless and the other gapped. Furthermore, we calculate the leading, one-loop contribution to the pressure of the system. In the chiral limit, a closed analytic expression for the pressure exists, which features an unusual scaling with temperature and magnetic field, $T^3B/f_\pi$, at low temperatures, $T\ll B/f_\pi$. Finally, we determine the pion decay rate as a function of the magnetic field at the tree level. The result is affected by a competition of the anisotropic kinematics and the enlarged phase space due to the anomalous mass of the neutral pion. In the chiral limit, the decay rate scales as $B^3/f_\pi^5$. |
1709.03501 | Manuel Krauss | Manuel E. Krauss, Florian Staub | Perturbativity Constraints in BSM Models | 64 pages, 20 figures | Eur. Phys. J. C (2018) 78:185 | 10.1140/epjc/s10052-018-5676-5 | BONN-TH-2017-08, KA-TP-30-2017 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phenomenological studies performed for non-supersymmetric extensions of the
Standard Model usually use tree-level parameters as input to define the scalar
sector of the model. This implicitly assumes that a full on-shell calculation
of the scalar sector is possible - and meaningful. However, this doesn't have
to be the case as we show explicitly at the example of the Georgi-Machacek
model. This model comes with an appealing custodial symmetry to explain the
smallness of the $\rho$ parameter. However, the model cannot be renormalised
on-shell without breaking the custodial symmetry. Moreover, we find that it can
often happen that the radiative corrections are so large that any consideration
based on a perturbative expansion appears to be meaningless: counter-terms to
quartic couplings can become much larger than $4\pi$ and/or two-loop mass
corrections can become larger than the one-loop ones. Therefore, conditions are
necessary to single out parameter regions which cannot be treated
perturbatively. We propose and discuss different sets of such perturbativity
conditions and show their impact on the parameter space of the Georgi-Machacek
model. Moreover, the proposed conditions are general enough that they can be
applied to other models as well. We also point out that the vacuum stability
constraints in the Georgi-Machacek model, which have so far only been applied
at the tree level, receive crucial radiative corrections. We show that large
regions of the parameter space which feature a stable electroweak vacuum at the
loop level would have been - wrongly - ruled out by the tree-level conditions.
| [
{
"created": "Mon, 11 Sep 2017 18:00:00 GMT",
"version": "v1"
}
] | 2018-03-09 | [
[
"Krauss",
"Manuel E.",
""
],
[
"Staub",
"Florian",
""
]
] | Phenomenological studies performed for non-supersymmetric extensions of the Standard Model usually use tree-level parameters as input to define the scalar sector of the model. This implicitly assumes that a full on-shell calculation of the scalar sector is possible - and meaningful. However, this doesn't have to be the case as we show explicitly at the example of the Georgi-Machacek model. This model comes with an appealing custodial symmetry to explain the smallness of the $\rho$ parameter. However, the model cannot be renormalised on-shell without breaking the custodial symmetry. Moreover, we find that it can often happen that the radiative corrections are so large that any consideration based on a perturbative expansion appears to be meaningless: counter-terms to quartic couplings can become much larger than $4\pi$ and/or two-loop mass corrections can become larger than the one-loop ones. Therefore, conditions are necessary to single out parameter regions which cannot be treated perturbatively. We propose and discuss different sets of such perturbativity conditions and show their impact on the parameter space of the Georgi-Machacek model. Moreover, the proposed conditions are general enough that they can be applied to other models as well. We also point out that the vacuum stability constraints in the Georgi-Machacek model, which have so far only been applied at the tree level, receive crucial radiative corrections. We show that large regions of the parameter space which feature a stable electroweak vacuum at the loop level would have been - wrongly - ruled out by the tree-level conditions. |
1404.0891 | Rafal Maciula | Rafal Maciula, Andreas van Hameren and Antoni Szczurek | Charm meson production and double parton interactions at the LHC | 12 pages, 8 figures, talk given by R. Maciula at the XX Cracow
EPIPHANY Conference on the Physics at the LHC, 8-10 January 2014, Cracow,
Poland | null | 10.5506/APhysPolB.45.1493 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss production of open charm mesons in proton-proton collisions at the
LHC. The cross section for inclusive production of $c \bar c$ pairs is
calculated within the $k_{\perp}$-factorization approach in which a major part
of higher-order corrections is belived to be effectively included. We use and
test the applicability of several unintegrated gluon distributions. Numerical
results of the $k_{\perp}$-factorization approach are compared to NLO pQCD
collinear predictions. Inclusive differential distributions in transverse
momentum and (pseudo)rapidity of several charmed mesons are presented and
compared to recent results of the ALICE, ATLAS and LHCb collaborations. We also
examine production of neutral charmed meson-antimeson pairs ($D^0 {\overline
D^0}$) in unique kinematics of forward rapidities of the LHCb experiment.
Kinematical correlations in azimuthal angle $\varphi_{D^0 {\overline D^0}}$,
invariant mass $M_{D^0 {\overline D^0}}$ and rapidity difference $Y_{D^0
{\overline D^0}}$ distributions are calculated. Moreover, we also discuss
production of two pairs of $c \bar c$ within a simple formalism of
double-parton scattering (DPS). We compare results of calculations of
single-parton scattering (SPS) and double-parton scattering (DPS) for
production of $c \bar c c \bar c$ and for $D^0-D^0$ meson-meson correlations.
We compare our predictions for double charm production with recent results of
the LHCb collaboration for azimuthal angle $\varphi_{D^0 D^0}$ distribution,
dimeson invariant mass $M_{D^0 D^0}$ and rapidity distance between mesons
$Y_{D^0 D^0}$. The obtained results clearly certify the dominance of DPS in the
production of events with double charm.
| [
{
"created": "Thu, 3 Apr 2014 12:58:41 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Apr 2014 08:32:10 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Maciula",
"Rafal",
""
],
[
"van Hameren",
"Andreas",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss production of open charm mesons in proton-proton collisions at the LHC. The cross section for inclusive production of $c \bar c$ pairs is calculated within the $k_{\perp}$-factorization approach in which a major part of higher-order corrections is belived to be effectively included. We use and test the applicability of several unintegrated gluon distributions. Numerical results of the $k_{\perp}$-factorization approach are compared to NLO pQCD collinear predictions. Inclusive differential distributions in transverse momentum and (pseudo)rapidity of several charmed mesons are presented and compared to recent results of the ALICE, ATLAS and LHCb collaborations. We also examine production of neutral charmed meson-antimeson pairs ($D^0 {\overline D^0}$) in unique kinematics of forward rapidities of the LHCb experiment. Kinematical correlations in azimuthal angle $\varphi_{D^0 {\overline D^0}}$, invariant mass $M_{D^0 {\overline D^0}}$ and rapidity difference $Y_{D^0 {\overline D^0}}$ distributions are calculated. Moreover, we also discuss production of two pairs of $c \bar c$ within a simple formalism of double-parton scattering (DPS). We compare results of calculations of single-parton scattering (SPS) and double-parton scattering (DPS) for production of $c \bar c c \bar c$ and for $D^0-D^0$ meson-meson correlations. We compare our predictions for double charm production with recent results of the LHCb collaboration for azimuthal angle $\varphi_{D^0 D^0}$ distribution, dimeson invariant mass $M_{D^0 D^0}$ and rapidity distance between mesons $Y_{D^0 D^0}$. The obtained results clearly certify the dominance of DPS in the production of events with double charm. |
1009.4577 | Amine Ahriche | Amine Ahriche (Jijel U.) | A strong first order phase transition in the UMSSM | talk presented in PASCOS2010, Valencia, Spain from 19-23 Jul. 2010 | J.Phys.Conf.Ser.259:012085,2010 | 10.1088/1742-6596/259/1/012085 | LPTh-Ji 10/007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, the electroweak phase transition (EWPT) strength has been
investigated within the $U(1)$ extended Minimal Supersymmetric Standard Model
(UMSSM) without introducing any exotic fields. We found that the EWPT could be
strongly first order for reasonable values of the lightest Higgs and neutralino
masses.
| [
{
"created": "Thu, 23 Sep 2010 11:13:59 GMT",
"version": "v1"
}
] | 2011-01-04 | [
[
"Ahriche",
"Amine",
"",
"Jijel U."
]
] | In this work, the electroweak phase transition (EWPT) strength has been investigated within the $U(1)$ extended Minimal Supersymmetric Standard Model (UMSSM) without introducing any exotic fields. We found that the EWPT could be strongly first order for reasonable values of the lightest Higgs and neutralino masses. |
hep-ph/0702095 | Nasrallah Nasrallah | N. F. Nasrallah | Kaon-Baryon Couplings and the Goldberger-Treiman Relation in SU(3) x
SU(3) | 6 Pages | Phys.Lett.B647:262-264,2007 | 10.1016/j.physletb.2007.02.014 | null | hep-ph | null | The coupling constants G_(K N Lambda) and G_(K N Sigma) are obtained from the
Goldberger-Treiman relation in the strange channel with chiral symmetry
breaking taken into account. The results, G_(K N Lambda)=-12.3+-1.2 and G_(K N
Sigma)=5.5+-.5 come close to the SU(3) values.
| [
{
"created": "Thu, 8 Feb 2007 20:53:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nasrallah",
"N. F.",
""
]
] | The coupling constants G_(K N Lambda) and G_(K N Sigma) are obtained from the Goldberger-Treiman relation in the strange channel with chiral symmetry breaking taken into account. The results, G_(K N Lambda)=-12.3+-1.2 and G_(K N Sigma)=5.5+-.5 come close to the SU(3) values. |
1705.05808 | Chandan Mondal | Chandan Mondal, Dipankar Chakrabarti, Xingbo Zhao | Deuteron transverse densities in holographic QCD | 11 pages, 9 figures; to appear in Eur. Phys. J. A | Eur. Phys. J. A 53, 106 (2017) | 10.1140/epja/i2017-12292-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the transverse charge density in the longitudinally as well as
transversely polarized deuteron using the recent empirical description of the
deuteron electromagnetic form factors in the framework of holographic QCD. The
predictions of the holographic QCD are compared with the results of a standard
phenomenological parameterization. In addition, we evaluate GPDs and the
gravitational form factors for the deuteron. The longitudinal momentum
densities are also investigated in the transverse plane.
| [
{
"created": "Tue, 16 May 2017 17:21:19 GMT",
"version": "v1"
}
] | 2017-06-01 | [
[
"Mondal",
"Chandan",
""
],
[
"Chakrabarti",
"Dipankar",
""
],
[
"Zhao",
"Xingbo",
""
]
] | We investigate the transverse charge density in the longitudinally as well as transversely polarized deuteron using the recent empirical description of the deuteron electromagnetic form factors in the framework of holographic QCD. The predictions of the holographic QCD are compared with the results of a standard phenomenological parameterization. In addition, we evaluate GPDs and the gravitational form factors for the deuteron. The longitudinal momentum densities are also investigated in the transverse plane. |
1904.11542 | Chris Quigg | Estia J. Eichten and Chris Quigg | Quarkonium wave functions at the origin: an update | 2 pages | null | null | FERMILAB--PUB--19/176--T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a newly developed interquark potential, we tabulate values of the
radial Schr\"{o}dinger wave function or its first nonvanishing derivative at
zero quark--antiquark separation, for $c\bar{c}$, $c\bar{b}$, and $b\bar{b}$
levels that lie below, or just above, the flavor threshold. These quantities
are required inputs for evaluating quarkonium production cross sections.
| [
{
"created": "Thu, 25 Apr 2019 19:03:28 GMT",
"version": "v1"
}
] | 2019-04-29 | [
[
"Eichten",
"Estia J.",
""
],
[
"Quigg",
"Chris",
""
]
] | Using a newly developed interquark potential, we tabulate values of the radial Schr\"{o}dinger wave function or its first nonvanishing derivative at zero quark--antiquark separation, for $c\bar{c}$, $c\bar{b}$, and $b\bar{b}$ levels that lie below, or just above, the flavor threshold. These quantities are required inputs for evaluating quarkonium production cross sections. |
1212.4495 | Jessie Shelton | Michael L. Graesser and Jessie Shelton | Hunting Asymmetric Stops | 5 pages, 4 figures. V2: version accepted for publication in PRL | null | 10.1103/PhysRevLett.111.121802 | LA-UR-12-26897 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that in the irreducible natural SUSY spectrum, stops have
comparable branching fractions to chargino-bottom and neutralino-top in the
vast bulk of parameter space, provided only that both decay modes are
kinematically accessible. The total stop pair branching fractions into ttbar +
MET can therefore be reduced to O(50%), while b bbar + X branching fractions
are typically much smaller, O(10%), thus limiting the reach of traditional stop
searches. We propose a new stop search targeting the asymmetric final state
\~t\~t* --> t chi^0 b chi^pm, which can restore sensitivity to natural stops in
the 7 and 8 TeV LHC runs. In addition we present a new variable, topness, which
efficiently suppresses the dominant top backgrounds to semi-leptonic top
partner searches. We demonstrate the utility of topness in both our asymmetric
search channel and traditional \~t\~t* --> ttbar + MET searches and show that
it matches or out-performs existing variables.
| [
{
"created": "Tue, 18 Dec 2012 21:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Oct 2013 05:29:01 GMT",
"version": "v2"
}
] | 2013-10-08 | [
[
"Graesser",
"Michael L.",
""
],
[
"Shelton",
"Jessie",
""
]
] | We point out that in the irreducible natural SUSY spectrum, stops have comparable branching fractions to chargino-bottom and neutralino-top in the vast bulk of parameter space, provided only that both decay modes are kinematically accessible. The total stop pair branching fractions into ttbar + MET can therefore be reduced to O(50%), while b bbar + X branching fractions are typically much smaller, O(10%), thus limiting the reach of traditional stop searches. We propose a new stop search targeting the asymmetric final state \~t\~t* --> t chi^0 b chi^pm, which can restore sensitivity to natural stops in the 7 and 8 TeV LHC runs. In addition we present a new variable, topness, which efficiently suppresses the dominant top backgrounds to semi-leptonic top partner searches. We demonstrate the utility of topness in both our asymmetric search channel and traditional \~t\~t* --> ttbar + MET searches and show that it matches or out-performs existing variables. |
2205.05762 | Walter Tangarife | Diego Restrepo, Andr\'es Rivera, Walter Tangarife | Dirac dark matter, neutrino masses, and dark baryogenesis | 22 pages, 6 figures. Comments are welcome! v.3 matches the published
version | Phys. Rev. D 106, 055021 (2022) | 10.1103/PhysRevD.106.055021 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a gauged baryon number model as an example of models where all new
fermions required to cancel out the anomalies help to solve phenomenological
problems of the standard model (SM). Dark fermion doublets, along with the
iso-singlet charged fermions, in conjunction with a set of SM-singlet fermions,
participate in the generation of small neutrino masses through the Dirac-dark
Zee mechanism. The other SM-singlets explain the dark matter in the Universe,
while their coupling to an inert singlet scalar is the source of the $CP$
violation. In the presence of a strong first-order electroweak phase
transition, this "dark" $CP$ violation allows for a successful electroweak
baryogenesis mechanism.
| [
{
"created": "Wed, 11 May 2022 20:18:03 GMT",
"version": "v1"
},
{
"created": "Sat, 21 May 2022 16:25:59 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Sep 2022 14:56:06 GMT",
"version": "v3"
}
] | 2022-09-19 | [
[
"Restrepo",
"Diego",
""
],
[
"Rivera",
"Andrés",
""
],
[
"Tangarife",
"Walter",
""
]
] | We present a gauged baryon number model as an example of models where all new fermions required to cancel out the anomalies help to solve phenomenological problems of the standard model (SM). Dark fermion doublets, along with the iso-singlet charged fermions, in conjunction with a set of SM-singlet fermions, participate in the generation of small neutrino masses through the Dirac-dark Zee mechanism. The other SM-singlets explain the dark matter in the Universe, while their coupling to an inert singlet scalar is the source of the $CP$ violation. In the presence of a strong first-order electroweak phase transition, this "dark" $CP$ violation allows for a successful electroweak baryogenesis mechanism. |
2211.09105 | Saeed Ansarifard | S. Ansarifard and Y. Farzan | Revisiting pseudo-Dirac neutrino scenario after recent solar neutrino
data | Comments for v2: GNO and Gallex data added; results unchanged | null | 10.1103/PhysRevD.107.075029 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | It is still unknown whether the mass terms for neutrinos are of Majorana type
or of Dirac type. An interesting possibility, known as pseudo-Dirac scheme
combines these two with a dominant Dirac mass term and a subdominant Majorana
one. As a result, the mass eigenstates come in pairs with a maximal mixing and
a small splitting determined by the Majorana mass. This will affect the
neutrino oscillation pattern for long baselines. We revisit this scenario
employing recent solar neutrino data, including the seasonal variation of the
$^7$Be flux recently reported by BOREXINO. We constrain the splitting using
these data and find that both the time integrated solar neutrino data and the
seasonal variation independently point towards a new pseudo-Dirac solution with
nonzero splitting for $\nu_2$ of $\Delta m_2^2\simeq 1.5\times 10^{-11}$
eV$^2$. We propose alternative methods to test this new solution. In
particular, we point out the importance of measuring the solar neutrino flux at
the intermediate energies $1.5~{\rm MeV}<E_\nu<3.5~{\rm MeV}$ (below the
Super-Kamiokande detection threshold) as well as a more precise measurement of
the $pep$ flux. The code is available on
\href{https://github.com/SaeedAnsarifard/SolarNeutrinos-pseudoDirac.git}{Github}
| [
{
"created": "Wed, 16 Nov 2022 18:47:28 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2023 08:31:32 GMT",
"version": "v2"
}
] | 2023-05-10 | [
[
"Ansarifard",
"S.",
""
],
[
"Farzan",
"Y.",
""
]
] | It is still unknown whether the mass terms for neutrinos are of Majorana type or of Dirac type. An interesting possibility, known as pseudo-Dirac scheme combines these two with a dominant Dirac mass term and a subdominant Majorana one. As a result, the mass eigenstates come in pairs with a maximal mixing and a small splitting determined by the Majorana mass. This will affect the neutrino oscillation pattern for long baselines. We revisit this scenario employing recent solar neutrino data, including the seasonal variation of the $^7$Be flux recently reported by BOREXINO. We constrain the splitting using these data and find that both the time integrated solar neutrino data and the seasonal variation independently point towards a new pseudo-Dirac solution with nonzero splitting for $\nu_2$ of $\Delta m_2^2\simeq 1.5\times 10^{-11}$ eV$^2$. We propose alternative methods to test this new solution. In particular, we point out the importance of measuring the solar neutrino flux at the intermediate energies $1.5~{\rm MeV}<E_\nu<3.5~{\rm MeV}$ (below the Super-Kamiokande detection threshold) as well as a more precise measurement of the $pep$ flux. The code is available on \href{https://github.com/SaeedAnsarifard/SolarNeutrinos-pseudoDirac.git}{Github} |
1003.2933 | Mark Round | Mark Round | Holographic Renormalisation and the Electroweak Precision Parameters | null | Phys.Rev.D82:053002,2010 | 10.1103/PhysRevD.82.053002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of holographic renormalisation on an AdS/QCD inspired
description of dynamical electroweak symmetry breaking. Our model is a 5D slice
of AdS_5 geometry containing a bulk scalar and SU(2) times SU(2) gauge fields.
The scalar field obtains a VEV which represents a condensate that triggers
electroweak symmetry breaking. Fermion fields are constrained to live on the UV
brane and do not propagate in the bulk. The two-point functions are
holographically renormalised through the addition of boundary counterterms.
Measurable quantities are then expressed in terms of well defined physical
parameters, free from any spurious dependence on the UV cut-off. A complete
study of the precision parameters is carried out and bounds on physical
quantities derived. The large-N scaling of results is discussed.
| [
{
"created": "Mon, 15 Mar 2010 14:56:23 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Oct 2010 12:05:19 GMT",
"version": "v2"
}
] | 2010-10-12 | [
[
"Round",
"Mark",
""
]
] | We study the effects of holographic renormalisation on an AdS/QCD inspired description of dynamical electroweak symmetry breaking. Our model is a 5D slice of AdS_5 geometry containing a bulk scalar and SU(2) times SU(2) gauge fields. The scalar field obtains a VEV which represents a condensate that triggers electroweak symmetry breaking. Fermion fields are constrained to live on the UV brane and do not propagate in the bulk. The two-point functions are holographically renormalised through the addition of boundary counterterms. Measurable quantities are then expressed in terms of well defined physical parameters, free from any spurious dependence on the UV cut-off. A complete study of the precision parameters is carried out and bounds on physical quantities derived. The large-N scaling of results is discussed. |
1503.02280 | HyungJoo Kim | HyungJoo Kim and Su Houng Lee | Renormalization of dimension 6 gluon operators | 4 pages, 2 figures | null | 10.1016/j.physletb.2015.07.028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify the independent dimension 6 twist 4 gluon operators and calculate
their renormalization in the pure gauge theory. By constructing the
renormalization group invariant combinations, we find the scale invariant
condensates that can be estimated in nonperturbative calculations and used in
QCD sum rules for heavy quark systems in medium.
| [
{
"created": "Sun, 8 Mar 2015 14:40:39 GMT",
"version": "v1"
}
] | 2015-07-22 | [
[
"Kim",
"HyungJoo",
""
],
[
"Lee",
"Su Houng",
""
]
] | We identify the independent dimension 6 twist 4 gluon operators and calculate their renormalization in the pure gauge theory. By constructing the renormalization group invariant combinations, we find the scale invariant condensates that can be estimated in nonperturbative calculations and used in QCD sum rules for heavy quark systems in medium. |
hep-ph/0006016 | Christopher Smith | G. Lopez Castro, J. Pestieau, C. Smith and S. Trine | Parapositronium Decay and Dispersion Relations | LaTeX, 13 pages, 1 eps figure | null | null | null | hep-ph | null | Positronium decay rates are computed at the one-loop level, using
convolution-type factorized amplitudes. The dynamics of this factorization is
probed with dispersion relations, showing that unallowed approximations are
usually made, and some ordre alpha^2 corrections missed. Further, we discuss
the relevance of the Schrodinger wavefunction as the basis for perturbative
calculations. Finally, we apply our formalism to the parapositronium two-photon
decay.
| [
{
"created": "Thu, 1 Jun 2000 18:49:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Castro",
"G. Lopez",
""
],
[
"Pestieau",
"J.",
""
],
[
"Smith",
"C.",
""
],
[
"Trine",
"S.",
""
]
] | Positronium decay rates are computed at the one-loop level, using convolution-type factorized amplitudes. The dynamics of this factorization is probed with dispersion relations, showing that unallowed approximations are usually made, and some ordre alpha^2 corrections missed. Further, we discuss the relevance of the Schrodinger wavefunction as the basis for perturbative calculations. Finally, we apply our formalism to the parapositronium two-photon decay. |
0907.3523 | Tony Gherghetta | Tony Gherghetta, Daniel Sword | Fermion Flavor in Soft-Wall AdS | 22 pages, 8 figures | Phys.Rev.D80:065015,2009 | 10.1103/PhysRevD.80.065015 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formalism for modeling multiple fermion generations in a warped extra
dimension with a soft-wall is presented. A bulk Higgs condensate is responsible
for generating mass for the zero-mode fermions but leads to additional
complexity from large mixing between different flavors. We extend existing
single-generation analyses by considering new special cases in which analytical
solutions can be derived and discuss flavor constraints. The general
three-generation case is then treated using a simple numerical routine.
Assuming anarchic 5D parameters we find a fermion mass spectrum resembling the
standard model quarks and leptons with highly degenerate couplings to
Kaluza-Klein gauge bosons. This confirms that the soft-wall model has similar
attractive features as that found in hard-wall models, providing a framework to
generalize existing phenomenological analyses.
| [
{
"created": "Tue, 21 Jul 2009 01:14:42 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Gherghetta",
"Tony",
""
],
[
"Sword",
"Daniel",
""
]
] | The formalism for modeling multiple fermion generations in a warped extra dimension with a soft-wall is presented. A bulk Higgs condensate is responsible for generating mass for the zero-mode fermions but leads to additional complexity from large mixing between different flavors. We extend existing single-generation analyses by considering new special cases in which analytical solutions can be derived and discuss flavor constraints. The general three-generation case is then treated using a simple numerical routine. Assuming anarchic 5D parameters we find a fermion mass spectrum resembling the standard model quarks and leptons with highly degenerate couplings to Kaluza-Klein gauge bosons. This confirms that the soft-wall model has similar attractive features as that found in hard-wall models, providing a framework to generalize existing phenomenological analyses. |
1311.7611 | Gorazd Cvetic | Gorazd Cveti\v{c} | Evaluations of low-energy physical quantities in QCD with IR freezing of
the coupling | 11 pages, 2 Figures; new references added ([46,57,68]); presented at
the Satellite Meeting of Lightcone 2013+, Skiathos, Greece, May 24-25, 2013;
to appear in Few-Body Systems | null | 10.1007/s00601-013-0797-8 | USM-TH-317 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | MSbar-like schemes in QCD have in general the running coupling which contains
Landau singularities, i.e., singularities outside the timelike semi-axis, at
low squared momenta. As a consequence, evaluation of the spacelike quantities,
such as current correlators, in terms of (powers of) such a coupling then
results in quantities which contradict the basic principles of Quantum Field
Theories. On the other hand, in those QCD frameworks where the running coupling
remains finite at low squared momenta (IR freezing), the coupling usually does
not have Landau singularities in the complex plane of the squared momenta. I
argue that in such QCD frameworks the spacelike quantities should not be
evaluated as a power series, but rather as a series in derivatives of the
coupling with respect to the logarithm of the squared momenta. Such series show
considerably better convergence properties. Moreover, Pade-related resummations
of such logarithmic derivative series give convergent series, thus eliminating
the practical problem of series divergence due to renormalons.
| [
{
"created": "Fri, 29 Nov 2013 15:54:22 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Dec 2013 14:03:06 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Cvetič",
"Gorazd",
""
]
] | MSbar-like schemes in QCD have in general the running coupling which contains Landau singularities, i.e., singularities outside the timelike semi-axis, at low squared momenta. As a consequence, evaluation of the spacelike quantities, such as current correlators, in terms of (powers of) such a coupling then results in quantities which contradict the basic principles of Quantum Field Theories. On the other hand, in those QCD frameworks where the running coupling remains finite at low squared momenta (IR freezing), the coupling usually does not have Landau singularities in the complex plane of the squared momenta. I argue that in such QCD frameworks the spacelike quantities should not be evaluated as a power series, but rather as a series in derivatives of the coupling with respect to the logarithm of the squared momenta. Such series show considerably better convergence properties. Moreover, Pade-related resummations of such logarithmic derivative series give convergent series, thus eliminating the practical problem of series divergence due to renormalons. |
1101.3049 | Ya-Zheng Chen | Ya-Zheng Chen, Yan-An Luo, Lei Li, Hong Shen, Xue-Qian Li | Determining the nuclear form factor for detection of dark matter in the
relativistic mean field theory | 14 Pages, 4 figures, 1 table | Commun.Theor.Phys.55:1059-1064,2011 | 10.1088/0253-6102/55/6/21 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we derive the nuclear form factor for the spin-independent
collision between the WIMPs and nucleus in terms of the relativistic mean field
(RMF) theory. Comparison with the traditional form factors which are commonly
used in literature is given and it is found that our results are slightly above
that of the 2PF model by 4% to 8%, but deviate from the Helm form factor by 15%
to 25% for the whole recoil energy spectrum of 0$\sim $ 100 keV. Moreover,
taking Xe and Ge as examples, we show the dependence of the form factor on the
recoil energy.
| [
{
"created": "Sun, 16 Jan 2011 05:17:00 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Chen",
"Ya-Zheng",
""
],
[
"Luo",
"Yan-An",
""
],
[
"Li",
"Lei",
""
],
[
"Shen",
"Hong",
""
],
[
"Li",
"Xue-Qian",
""
]
] | In this work, we derive the nuclear form factor for the spin-independent collision between the WIMPs and nucleus in terms of the relativistic mean field (RMF) theory. Comparison with the traditional form factors which are commonly used in literature is given and it is found that our results are slightly above that of the 2PF model by 4% to 8%, but deviate from the Helm form factor by 15% to 25% for the whole recoil energy spectrum of 0$\sim $ 100 keV. Moreover, taking Xe and Ge as examples, we show the dependence of the form factor on the recoil energy. |
1805.11402 | Yoav Afik | Yoav Afik, Jonathan Cohen, Eitan Gozani, Enrique Kajomovitz, Yoram
Rozen | Establishing a Search for $b \rightarrow s \ell^{+} \ell^{-}$ Anomalies
at the LHC | null | J. High Energ. Phys. (2018) 2018: 56 | 10.1007/JHEP08(2018)056 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the fundamental predictions of the Standard Model is Lepton Flavour
Universality. Any deviation from this prediction would indicate the existence
of physics beyond the Standard Model. Recent LHCb measurements present a
pattern of deviations from this prediction in rare B-meson decays. While not
yet statistically significant (currently $2.2-2.6 \sigma$), these measurements
show an imbalance in the ratio of B-meson decays to a pair of muons in
association with a Kaon and decays to a pair of electrons in association with a
Kaon. If the measured deviations are indeed present in nature, new physics may
mediate interactions involving a pair of same flavour leptons, a $b$- and an
$s$-quark. We present the prospect for a search of new physics in this type of
interactions at the LHC, in a process that involves an $s$-quark, and a final
state with two leptons and a $b$-jet. The proposed search can improve the
sensitivity to new physics in these processes by a factor of four compared to
current searches with in the total dataset expected at the LHC.
| [
{
"created": "Tue, 29 May 2018 12:55:32 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2018 11:29:51 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Aug 2018 21:09:57 GMT",
"version": "v3"
}
] | 2018-08-21 | [
[
"Afik",
"Yoav",
""
],
[
"Cohen",
"Jonathan",
""
],
[
"Gozani",
"Eitan",
""
],
[
"Kajomovitz",
"Enrique",
""
],
[
"Rozen",
"Yoram",
""
]
] | One of the fundamental predictions of the Standard Model is Lepton Flavour Universality. Any deviation from this prediction would indicate the existence of physics beyond the Standard Model. Recent LHCb measurements present a pattern of deviations from this prediction in rare B-meson decays. While not yet statistically significant (currently $2.2-2.6 \sigma$), these measurements show an imbalance in the ratio of B-meson decays to a pair of muons in association with a Kaon and decays to a pair of electrons in association with a Kaon. If the measured deviations are indeed present in nature, new physics may mediate interactions involving a pair of same flavour leptons, a $b$- and an $s$-quark. We present the prospect for a search of new physics in this type of interactions at the LHC, in a process that involves an $s$-quark, and a final state with two leptons and a $b$-jet. The proposed search can improve the sensitivity to new physics in these processes by a factor of four compared to current searches with in the total dataset expected at the LHC. |
1301.2617 | A. Tolga Tasci | I. T. Cakir, A. Senol and A. T. Tasci | Associated Production of Single Top Quark and W-boson Through Anomalous
Couplings at LHeC based $\gamma p$ Colliders | 13 pages, 5 figures | Mod.Phys.Lett. A29 (2014) 1450021 | 10.1142/S0217732314500217 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the production of a single top quark in association with a $W$
boson at LHeC based $\gamma p$ collider. We compute the cross section for the
process $\gamma p\rightarrow WtX$ with the anomalous $Wtb$ and $Wtb\gamma$
couplings. We find that the sensitivities to anomalous couplings of top quark
are shown to be comparable, even better than the ones obtained from direct
searches at hadron colliders.
| [
{
"created": "Fri, 11 Jan 2013 22:00:45 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2013 14:43:46 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Mar 2013 08:25:17 GMT",
"version": "v3"
},
{
"created": "Thu, 27 Jun 2013 12:56:51 GMT",
"version": "v4"
}
] | 2014-02-11 | [
[
"Cakir",
"I. T.",
""
],
[
"Senol",
"A.",
""
],
[
"Tasci",
"A. T.",
""
]
] | We consider the production of a single top quark in association with a $W$ boson at LHeC based $\gamma p$ collider. We compute the cross section for the process $\gamma p\rightarrow WtX$ with the anomalous $Wtb$ and $Wtb\gamma$ couplings. We find that the sensitivities to anomalous couplings of top quark are shown to be comparable, even better than the ones obtained from direct searches at hadron colliders. |
hep-ph/9212232 | Bludman | S. A. Bludman | The First Gauge Theory of Weak Interactions and the Prediction of Weak
Neutral Currents | 7 pages, Latex. Revised version of hep-ph/9212232 including \def that
was previously missing | null | null | UPR-532-T | hep-ph | null | The three theoretical and historical components of the Standard Model are the
exact chiral gauge theory of weak interactions, electroweak unification, and
the Higgs mechanism for spontaneous symmetry breaking. I put into historical
perspective my 1958 invention of the first gauge theory of weak interactions,
predicting weak neutral currents, and show how the fundamental differences
between global and gauge symmetries and between partial flavour and exact gauge
symmetries, emerged in the strong and weak interactions. Although
renormalizability is necessary for theoretical consistency, electroweak
unification was not necessary, in principle. An interesting difference appears
between the $\sin^2{\theta_W}=0$ limit of the electroweak theory and the
original $SU(2)_W$ gauge theory of weak interactions. While the electroweak
mixing angle might have had any value (including zero), historically the value
$\sin^2{\theta_W} \sim 0.3$ actually observed in weak neutral currents gave
circumstantial support for the Standard Model and stimulated the search for
$W-$ and $Z-$mesons.
| [
{
"created": "Mon, 7 Dec 1992 20:02:12 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 1992 01:28:57 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Bludman",
"S. A.",
""
]
] | The three theoretical and historical components of the Standard Model are the exact chiral gauge theory of weak interactions, electroweak unification, and the Higgs mechanism for spontaneous symmetry breaking. I put into historical perspective my 1958 invention of the first gauge theory of weak interactions, predicting weak neutral currents, and show how the fundamental differences between global and gauge symmetries and between partial flavour and exact gauge symmetries, emerged in the strong and weak interactions. Although renormalizability is necessary for theoretical consistency, electroweak unification was not necessary, in principle. An interesting difference appears between the $\sin^2{\theta_W}=0$ limit of the electroweak theory and the original $SU(2)_W$ gauge theory of weak interactions. While the electroweak mixing angle might have had any value (including zero), historically the value $\sin^2{\theta_W} \sim 0.3$ actually observed in weak neutral currents gave circumstantial support for the Standard Model and stimulated the search for $W-$ and $Z-$mesons. |
1105.2922 | Stephan Narison | Stephan Narison | Gluon Condensates and m_{c,b} from QCD-Moments and their ratios to Order
alpha_s^3 and <G^4> | 11 pages, 9 figures, 5 tables. Improved version to appear in Phys.
Lett. B including a reevaluation of the different sources of the errors | null | 10.1016/j.physletb.2011.11.058 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the extraction of the gluon condensates <alpha_s G^2>,
<g^3f_{abc} G^3> and the MS running quark masses m_{c,b} from different
M_n(Q^2) Moments and their Ratios by including PT corrections to order
alpha_s^3, NPT terms up to <G^4> and using stability criteria of the results
versus the degree n (number of Q^2-derivative). We explicitly show that the
spectral part of the lowest moment M_1(0) depends strongly (as expected) on its
high-energy (continuum) contribution, which is minimized for M_{n> 3-4}(0).
Using higher moments and the correlations of <alpha_s G^2> with <g^3f_{abc}
G^3> and < G^4>, we obtain <alpha_s G^2>=(7.0+- 1.3)10^{-2} GeV^4 and
<g^3f_{abc} G^3>=(8.8+- 5.5) GeV^2 <alpha_s G^2>, while our analysis favours a
modified factorisation for <G^4>. Using the previous results, we re-determine
m_c(m_c) and find that the commonly used M_1(0) lowest moment tends to
overestimate its value compared to the ones from higher moments where stable
values of m_c(m_c) versus the variations of n and the continuum models are
reached. These features can indicate that the quoted errors of m_{c,b} from
M_1(0) may have been underestimated. Optimal results from different high-n
moments converge to the accurate (artithmetic) mean values: m_c(m_c)=1261(16)
MeV and m_b(m_b)=4171(14) MeV, in excellent agreement with results obtained in
[1] using some judicious choices of ratios of moments.
| [
{
"created": "Sun, 15 May 2011 04:56:30 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Nov 2011 19:57:58 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Narison",
"Stephan",
""
]
] | We reconsider the extraction of the gluon condensates <alpha_s G^2>, <g^3f_{abc} G^3> and the MS running quark masses m_{c,b} from different M_n(Q^2) Moments and their Ratios by including PT corrections to order alpha_s^3, NPT terms up to <G^4> and using stability criteria of the results versus the degree n (number of Q^2-derivative). We explicitly show that the spectral part of the lowest moment M_1(0) depends strongly (as expected) on its high-energy (continuum) contribution, which is minimized for M_{n> 3-4}(0). Using higher moments and the correlations of <alpha_s G^2> with <g^3f_{abc} G^3> and < G^4>, we obtain <alpha_s G^2>=(7.0+- 1.3)10^{-2} GeV^4 and <g^3f_{abc} G^3>=(8.8+- 5.5) GeV^2 <alpha_s G^2>, while our analysis favours a modified factorisation for <G^4>. Using the previous results, we re-determine m_c(m_c) and find that the commonly used M_1(0) lowest moment tends to overestimate its value compared to the ones from higher moments where stable values of m_c(m_c) versus the variations of n and the continuum models are reached. These features can indicate that the quoted errors of m_{c,b} from M_1(0) may have been underestimated. Optimal results from different high-n moments converge to the accurate (artithmetic) mean values: m_c(m_c)=1261(16) MeV and m_b(m_b)=4171(14) MeV, in excellent agreement with results obtained in [1] using some judicious choices of ratios of moments. |
1508.00216 | Marco Schreck MS | M. Schreck | Eikonal approximation, Finsler structures, and implications for
Lorentz-violating photons in weak gravitational fields | 63 pages, 4 figures | Phys. Rev. D 92, 125032 (2015) | 10.1103/PhysRevD.92.125032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current article shall contribute to understanding the classical analogue
of the minimal photon sector in the Lorentz-violating Standard-Model Extension
(SME). It is supposed to complement all studies performed on classical
point-particle equivalents of SME fermions. The classical analogue of a photon
is not a massive particle being described by a usual equation of motion, but a
geometric ray underlying the eikonal equation. The first part of the paper will
set up the necessary tools to understand this correspondence for interesting
cases of the minimal SME photon sector. In conventional optics the eikonal
equation follows from an action principle, which is demonstrated to work in
most (but not all) Lorentz-violating cases as well. The integrands of the
action functional correspond to Finsler structures, which establishes the
connection to Finsler geometry. The second part of the article treats
Lorentz-violating light rays in a weak gravitational background by implementing
the principle of minimal coupling. Thereby it is shown how Lorentz violation in
the photon sector can be constrained by measurements of light bending at
massive bodies such as the Sun. The phenomenological studies are based on the
currently running ESA mission GAIA and the planned NASA/ESA mission LATOR. The
final part of the paper discusses certain aspects of explicit Lorentz violation
in gravity based on the setting of Finsler geometry.
| [
{
"created": "Sun, 2 Aug 2015 10:39:37 GMT",
"version": "v1"
}
] | 2016-01-06 | [
[
"Schreck",
"M.",
""
]
] | The current article shall contribute to understanding the classical analogue of the minimal photon sector in the Lorentz-violating Standard-Model Extension (SME). It is supposed to complement all studies performed on classical point-particle equivalents of SME fermions. The classical analogue of a photon is not a massive particle being described by a usual equation of motion, but a geometric ray underlying the eikonal equation. The first part of the paper will set up the necessary tools to understand this correspondence for interesting cases of the minimal SME photon sector. In conventional optics the eikonal equation follows from an action principle, which is demonstrated to work in most (but not all) Lorentz-violating cases as well. The integrands of the action functional correspond to Finsler structures, which establishes the connection to Finsler geometry. The second part of the article treats Lorentz-violating light rays in a weak gravitational background by implementing the principle of minimal coupling. Thereby it is shown how Lorentz violation in the photon sector can be constrained by measurements of light bending at massive bodies such as the Sun. The phenomenological studies are based on the currently running ESA mission GAIA and the planned NASA/ESA mission LATOR. The final part of the paper discusses certain aspects of explicit Lorentz violation in gravity based on the setting of Finsler geometry. |
hep-ph/0108160 | Vladimir Sauli | V. Sauli | Towards the solution of Schwinger-Dyson equations in Minkowski space | Abstract of PhD Thesis, 25 pages | null | null | null | hep-ph | null | This is an abstract of authors PhD thesis which is devoted to studies of
quantum field models with strong coupling. The {\em Schwinger-Dyson equations}
(SDEs) in momentum representation are solved in Minkowski space. The original
version of the paper hep-ph/0108160 is included in. The full text of author's
PhD thesis can be found at this WWW:
'http://gemma.ujf.cas.cz/~sauli/papers.html'
| [
{
"created": "Mon, 20 Aug 2001 17:00:55 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2001 10:42:21 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Dec 2001 14:41:56 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Nov 2002 18:13:42 GMT",
"version": "v4"
},
{
"created": "Tue, 21 Jun 2005 14:23:47 GMT",
"version": "v5"
}
] | 2007-05-23 | [
[
"Sauli",
"V.",
""
]
] | This is an abstract of authors PhD thesis which is devoted to studies of quantum field models with strong coupling. The {\em Schwinger-Dyson equations} (SDEs) in momentum representation are solved in Minkowski space. The original version of the paper hep-ph/0108160 is included in. The full text of author's PhD thesis can be found at this WWW: 'http://gemma.ujf.cas.cz/~sauli/papers.html' |
hep-ph/9707345 | Stefano Frixione | S. Frixione (ETH) and G. Ridolfi (INFN Genoa) | Jet photoproduction at HERA | 26 pages Latex, uses epsfig.sty, 24 eps figures included | Nucl.Phys.B507:315-333,1997 | 10.1016/S0550-3213(97)00575-0 | ETH-TH/97-21, GEF-TH-8/1997 | hep-ph | null | We compute various kinematical distributions for one-jet and two-jet
inclusive photoproduction at HERA. Our results are accurate to next-to-leading
order in QCD. We use the subtraction method for the cancellation of infrared
singularities. We perform a thorough study of the reliability of QCD
predictions; in particular, we consider the scale dependence of our results and
discuss the cases when the perturbative expansion might break down. We also
deal with the problem of the experimental definition of the pointlike and
hadronic components of the incident photon, and briefly discuss the sensitivity
of QCD predictions upon the input parameters of the calculation, like
$\alpha_S$ and the parton densities.
| [
{
"created": "Mon, 14 Jul 1997 16:01:22 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Frixione",
"S.",
"",
"ETH"
],
[
"Ridolfi",
"G.",
"",
"INFN Genoa"
]
] | We compute various kinematical distributions for one-jet and two-jet inclusive photoproduction at HERA. Our results are accurate to next-to-leading order in QCD. We use the subtraction method for the cancellation of infrared singularities. We perform a thorough study of the reliability of QCD predictions; in particular, we consider the scale dependence of our results and discuss the cases when the perturbative expansion might break down. We also deal with the problem of the experimental definition of the pointlike and hadronic components of the incident photon, and briefly discuss the sensitivity of QCD predictions upon the input parameters of the calculation, like $\alpha_S$ and the parton densities. |
hep-ph/9801344 | Burkhard Kaempfer | A. Peshier, B. K\"ampfer, O.P. Pavlenko, G. Soff | Thermodynamics of the \phi^4 theory in tadpole approximation | 6 pages, including 1 eps figure | Europhys.Lett.43:381-385,1998 | 10.1209/epl/i1998-00369-6 | FZR (January, 1998) | hep-ph | null | Relying on the Luttinger-Ward theorem we derive a thermodynamically
selfconsistent and scale independent approximation of the thermodynamic
potential for the scalar $\phi^4$ theory in the tadpole approximation. The
resulting thermodynamic potential as a function of the temperature is similar
to the one of the recently proposed screened perturbation theory.
| [
{
"created": "Mon, 19 Jan 1998 15:19:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Peshier",
"A.",
""
],
[
"Kämpfer",
"B.",
""
],
[
"Pavlenko",
"O. P.",
""
],
[
"Soff",
"G.",
""
]
] | Relying on the Luttinger-Ward theorem we derive a thermodynamically selfconsistent and scale independent approximation of the thermodynamic potential for the scalar $\phi^4$ theory in the tadpole approximation. The resulting thermodynamic potential as a function of the temperature is similar to the one of the recently proposed screened perturbation theory. |
1806.11122 | Nicol\'as Bernal Dr. | Nicol\'as Bernal, Catarina Cosme, Tommi Tenkanen, Ville Vaskonen | Scalar singlet dark matter in non-standard cosmologies | V1: 17 pages, 4 figures. V2: matches version published in EPJC | null | 10.1140/epjc/s10052-019-6550-9 | PI/UAN-2018-630FT | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study production of dark matter (DM) in models with a non-standard
expansion history. We consider both freeze-out and freeze-in mechanisms for
producing the observed DM abundance in a model where the DM consists of scalar
singlet particles coupled to the Standard Model sector via the Higgs portal. We
show that a non-standard expansion phase can lead to a significant change in
the DM abundance and therefore to observational ramifications. For example, for
DM freeze-in the required portal coupling can be much larger, whereas for DM
freeze-out much smaller values become allowed. We evaluate the relevant
constraints and discuss prospects for direct detection of such DM.
| [
{
"created": "Thu, 28 Jun 2018 18:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2019 21:06:56 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Bernal",
"Nicolás",
""
],
[
"Cosme",
"Catarina",
""
],
[
"Tenkanen",
"Tommi",
""
],
[
"Vaskonen",
"Ville",
""
]
] | We study production of dark matter (DM) in models with a non-standard expansion history. We consider both freeze-out and freeze-in mechanisms for producing the observed DM abundance in a model where the DM consists of scalar singlet particles coupled to the Standard Model sector via the Higgs portal. We show that a non-standard expansion phase can lead to a significant change in the DM abundance and therefore to observational ramifications. For example, for DM freeze-in the required portal coupling can be much larger, whereas for DM freeze-out much smaller values become allowed. We evaluate the relevant constraints and discuss prospects for direct detection of such DM. |
hep-ph/0012221 | S. Descotes | S. Descotes | Zweig rule violation in the scalar sector and values of low-energy
constants | 58 pages, 18 figures | JHEP 0103:002,2001 | 10.1088/1126-6708/2001/03/002 | IPNO-DR/00-33, SHEP/00-16 | hep-ph | null | We discuss the role of the Zweig rule violation in the scalar channel for the
determination of low-energy constants and condensates arising in the effective
chiral Lagrangian of QCD. The analysis of the Goldstone boson masses and decay
constants shows that the three-flavor condensate and some low-energy constants
are very sensitive to the value of the Zweig Rule violating constant L_6. A
similar study is performed in the case of the decay constants. A chiral sum
rule based on experimental data in the scalar channel is used to constrain L_6,
indicating a significant decrease between the two- and the three-flavor
condensates. The analysis of the scalar form factors of the pion at zero
momentum suggests that the pseudoscalar decay constant could also be suppressed
from N_f=2 to 3.
| [
{
"created": "Mon, 18 Dec 2000 12:18:05 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Descotes",
"S.",
""
]
] | We discuss the role of the Zweig rule violation in the scalar channel for the determination of low-energy constants and condensates arising in the effective chiral Lagrangian of QCD. The analysis of the Goldstone boson masses and decay constants shows that the three-flavor condensate and some low-energy constants are very sensitive to the value of the Zweig Rule violating constant L_6. A similar study is performed in the case of the decay constants. A chiral sum rule based on experimental data in the scalar channel is used to constrain L_6, indicating a significant decrease between the two- and the three-flavor condensates. The analysis of the scalar form factors of the pion at zero momentum suggests that the pseudoscalar decay constant could also be suppressed from N_f=2 to 3. |
hep-ph/9511290 | Takhmassib Aliev | T. M. Aliev, D. A. Demir, E. Iltan and N. K. Pak | Radiative $B^{*}\to B\gamma$ and $D^{*}\to D\gamma$ decays in light cone
QCD sum rules | 13 pages, Latex, 3 figures | Phys.Rev. D54 (1996) 857-862 | 10.1103/PhysRevD.54.857 | METU-HE-15/95 | hep-ph | null | The radiative decays $ B^{*} (D^{*})\rightarrow B(D) \gamma$ are investigated
in the framework of light cone QCD sum rules. The transition amplitude and
decay rates are estimated.It is shown that our results on branching ratios of D
meson decays are in good agreement with the existing experimental data.
| [
{
"created": "Fri, 10 Nov 1995 13:19:22 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 1995 10:16:45 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Aliev",
"T. M.",
""
],
[
"Demir",
"D. A.",
""
],
[
"Iltan",
"E.",
""
],
[
"Pak",
"N. K.",
""
]
] | The radiative decays $ B^{*} (D^{*})\rightarrow B(D) \gamma$ are investigated in the framework of light cone QCD sum rules. The transition amplitude and decay rates are estimated.It is shown that our results on branching ratios of D meson decays are in good agreement with the existing experimental data. |
0903.2322 | Deog Ki Hong | Deog Ki Hong | Baryons in dense QCD | 16 pages, 1 figure, A contribution to "Multifaceted Skyrmion", edited
by G. Brown and M. Rho, World Scientific | null | null | PNUTP-09-A01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | QCD predicts matter at high density should exhibit color superconductivity.
We review briefly several pertinent properties of color superconductivity and
then discuss how baryons are realized in color superconductors. Especially, we
explain an attempt to describe the color-flavor locked quark matter in terms of
bosonic degrees of freedom, where the gaped quarks and Fermi sea are realized
as Skyrmions, called superqualitons, and Q-matter, respectively.
| [
{
"created": "Fri, 13 Mar 2009 06:38:44 GMT",
"version": "v1"
}
] | 2009-03-16 | [
[
"Hong",
"Deog Ki",
""
]
] | QCD predicts matter at high density should exhibit color superconductivity. We review briefly several pertinent properties of color superconductivity and then discuss how baryons are realized in color superconductors. Especially, we explain an attempt to describe the color-flavor locked quark matter in terms of bosonic degrees of freedom, where the gaped quarks and Fermi sea are realized as Skyrmions, called superqualitons, and Q-matter, respectively. |
2209.14404 | Zurab Tavartkiladze | Zurab Tavartkiladze | SM extension with a gauged flavor $U(1)_F$ symmetry | Matched to Phys. Rev. D version | null | 10.1103/PhysRevD.106.115002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An extension of the Standard Model with anomaly free $U(1)_F$ flavor symmetry
is studied in this paper. With this extension and the addition of the
right-handed neutrino states, the solution of anomaly free charge assignments
is found, which gives appealing texture zero and hierarchical Yukawa matrices.
This gives us a natural understanding of the hierarchies between charged
fermion masses and Cabibbo-Kobayashi-Maskawa (CKM) matrix elements. Neutrino
Dirac and Majorana coupling matrices also have desirable structures leading to
successful neutrino oscillations with inverted neutrino mass ordering. Other
interesting implications of the presented scenario are also discussed.
| [
{
"created": "Wed, 28 Sep 2022 20:07:19 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2022 14:52:34 GMT",
"version": "v2"
}
] | 2022-12-14 | [
[
"Tavartkiladze",
"Zurab",
""
]
] | An extension of the Standard Model with anomaly free $U(1)_F$ flavor symmetry is studied in this paper. With this extension and the addition of the right-handed neutrino states, the solution of anomaly free charge assignments is found, which gives appealing texture zero and hierarchical Yukawa matrices. This gives us a natural understanding of the hierarchies between charged fermion masses and Cabibbo-Kobayashi-Maskawa (CKM) matrix elements. Neutrino Dirac and Majorana coupling matrices also have desirable structures leading to successful neutrino oscillations with inverted neutrino mass ordering. Other interesting implications of the presented scenario are also discussed. |
hep-ph/0206286 | Helmut Boettcher | J. Bl\"umlein and H. B\"ottcher | QCD Analysis of Polarized Scattering Data and New Polarized Parton
Distributions | 5 pages LATEX, 1 ps figure, 1 style file, Contribution to DIS 2002,
April 30 - May 4, 2002, Cracow | Acta Phys.Polon. B33 (2002) 3725-3730 | null | null | hep-ph | null | In this talk results from a new QCD analysis in leading (LO) and
next--to--leading (NLO) order are presented. New parametrizations of the
polarized quark and gluon densities are derived together with parametrizations
of their fully correlated 1$\sigma$ error bands. Furthermore the value of
$\alpha_s(M_Z^2)$ is determined. Finally a number of low moments of the
polarized parton densities are compared with results from lattice simulations.
| [
{
"created": "Thu, 27 Jun 2002 14:33:27 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Blümlein",
"J.",
""
],
[
"Böttcher",
"H.",
""
]
] | In this talk results from a new QCD analysis in leading (LO) and next--to--leading (NLO) order are presented. New parametrizations of the polarized quark and gluon densities are derived together with parametrizations of their fully correlated 1$\sigma$ error bands. Furthermore the value of $\alpha_s(M_Z^2)$ is determined. Finally a number of low moments of the polarized parton densities are compared with results from lattice simulations. |
hep-ph/0406109 | Reinosa | Jean-Paul Blaizot and Urko Reinosa | Isolating vacuum amplitudes in quantum field calculations at finite
temperature | 37 pages, 12 figures | Nucl.Phys. A764 (2006) 393-422 | 10.1016/j.nuclphysa.2005.09.004 | T04/073 and TUW-04-13 | hep-ph | null | In calculating Feynman diagrams at finite temperature, it is sometimes
convenient to isolate subdiagrams which do not depend explicitly on the
temperature. We show that, in the imaginary time formalism, such a separation
can be achieved easily by exploiting a simple method, due to M. Gaudin, to
perform the sum over the Matsubara frequencies. In order to manipulate freely
contributions which may be individually singular, a regularization has to be
introduced. We show that, in some cases, it is possible to choose this
regularization in such a way that the isolated subdiagrams can be identified
with analytical continuations of vacuum n-point functions. As an aside
illustration of Gaudin's method, we use it to prove the main part of a recent
conjecture concerning the relation which exists in the imaginary time formalism
between the expressions of a Feynman diagram at zero and finite temperature.
| [
{
"created": "Wed, 9 Jun 2004 18:52:57 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Blaizot",
"Jean-Paul",
""
],
[
"Reinosa",
"Urko",
""
]
] | In calculating Feynman diagrams at finite temperature, it is sometimes convenient to isolate subdiagrams which do not depend explicitly on the temperature. We show that, in the imaginary time formalism, such a separation can be achieved easily by exploiting a simple method, due to M. Gaudin, to perform the sum over the Matsubara frequencies. In order to manipulate freely contributions which may be individually singular, a regularization has to be introduced. We show that, in some cases, it is possible to choose this regularization in such a way that the isolated subdiagrams can be identified with analytical continuations of vacuum n-point functions. As an aside illustration of Gaudin's method, we use it to prove the main part of a recent conjecture concerning the relation which exists in the imaginary time formalism between the expressions of a Feynman diagram at zero and finite temperature. |
hep-ph/9902380 | Daniele Montanino | A. Masiero, D. Montanino, M. Peloso (S.I.S.S.A. and I.N.F.N., Trieste) | Can unstable relics save pure Cold Dark Matter? | 21 pages (RevTeX) + 3 figures (postscript) included with epsfig.sty.
Substantial corrections in the text. Final version to be published in
Astropart. Phys | Astropart.Phys.12:351-365,2000 | 10.1016/S0927-6505(99)00095-X | SISSA-15-99-EP | hep-ph astro-ph | null | The standard CDM model fails to describe the power spectrum of fluctuations
since it gives too much power at small scales. Among other possible
improvements, it has been suggested that an agreement with observations can be
achieved with the addition of a late decaying particle, through the injection
of non-thermal radiation and the consequent increase of the horizon length at
the equivalence time. We analyze the possibility of implementing this idea in
some extensions of the electroweak standard model, discussing the cosmological
and astrophysical bounds to which these schemes are subject.
| [
{
"created": "Wed, 17 Feb 1999 18:47:04 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Aug 1999 15:09:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Masiero",
"A.",
"",
"S.I.S.S.A. and I.N.F.N., Trieste"
],
[
"Montanino",
"D.",
"",
"S.I.S.S.A. and I.N.F.N., Trieste"
],
[
"Peloso",
"M.",
"",
"S.I.S.S.A. and I.N.F.N., Trieste"
]
] | The standard CDM model fails to describe the power spectrum of fluctuations since it gives too much power at small scales. Among other possible improvements, it has been suggested that an agreement with observations can be achieved with the addition of a late decaying particle, through the injection of non-thermal radiation and the consequent increase of the horizon length at the equivalence time. We analyze the possibility of implementing this idea in some extensions of the electroweak standard model, discussing the cosmological and astrophysical bounds to which these schemes are subject. |
2307.10362 | Sebastian Ellis | Carl Beadle, Sebastian A. R. Ellis, J\'er\'emie Quevillon, Pham Ngoc
Hoa Vuong | Quadratic Coupling of the Axion to Photons | 5 pages, 2 figures, 6 page appendix | null | null | CERN-TH-2023-136, DESY-23-097 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the QCD axion couples to the electromagnetic kinetic term at one
loop. The result is that if axions make up dark matter, they induce temporal
variation of the fine structure constant $\alpha$, which is severely
constrained. We recast these constraints on the QCD axion parameter space. We
also discuss how to generalise our finding to axion-like particles, and the
resulting constraints.
| [
{
"created": "Wed, 19 Jul 2023 18:00:01 GMT",
"version": "v1"
}
] | 2023-07-21 | [
[
"Beadle",
"Carl",
""
],
[
"Ellis",
"Sebastian A. R.",
""
],
[
"Quevillon",
"Jérémie",
""
],
[
"Vuong",
"Pham Ngoc Hoa",
""
]
] | We show that the QCD axion couples to the electromagnetic kinetic term at one loop. The result is that if axions make up dark matter, they induce temporal variation of the fine structure constant $\alpha$, which is severely constrained. We recast these constraints on the QCD axion parameter space. We also discuss how to generalise our finding to axion-like particles, and the resulting constraints. |
1012.3566 | Balasubramanian Ananthanarayan | B. Ananthanarayan, Monalisa Patra, P. Poulose | Signals of additional Z boson in e+e-\to W+W^- at the ILC with polarized
beams | 23 pages, 9 figures, uses plain latex; substantially improved
discussion, references added, version accepted for publication in JHEP | JHEP 1102:043,2011 | 10.1007/JHEP02(2011)043 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of fingerprinting the presence of heavy
additional Z' bosons that arise naturally in extensions of the standard model
such as E_6 models and left-right symmetric models, through their mixing with
the standard model Z boson. By considering a class of observables including
total cross sections, energy distributions and angular distributions of decay
leptons we find significant deviation from the standard model predictions for
these quantities with right-handed electrons and left-handed positrons at
\sqrt{s}=800 GeV. The deviations being less pronounced at smaller centre of
mass energies as the models are already tightly constrained. Our work suggests
that the ILC should have a strong beam polarization physics program
particularly with these configurations. On the other hand, a forward backward
asymmetry and lepton fraction in the backward direction are more sensitive to
new physics with realistic polarization due to interesting interplay with the
neutrino t- channel diagram. This process complements the study of fermion pair
production processes that have been considered for discrimination between these
models.
| [
{
"created": "Thu, 16 Dec 2010 11:31:20 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2011 04:13:47 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Ananthanarayan",
"B.",
""
],
[
"Patra",
"Monalisa",
""
],
[
"Poulose",
"P.",
""
]
] | We consider the possibility of fingerprinting the presence of heavy additional Z' bosons that arise naturally in extensions of the standard model such as E_6 models and left-right symmetric models, through their mixing with the standard model Z boson. By considering a class of observables including total cross sections, energy distributions and angular distributions of decay leptons we find significant deviation from the standard model predictions for these quantities with right-handed electrons and left-handed positrons at \sqrt{s}=800 GeV. The deviations being less pronounced at smaller centre of mass energies as the models are already tightly constrained. Our work suggests that the ILC should have a strong beam polarization physics program particularly with these configurations. On the other hand, a forward backward asymmetry and lepton fraction in the backward direction are more sensitive to new physics with realistic polarization due to interesting interplay with the neutrino t- channel diagram. This process complements the study of fermion pair production processes that have been considered for discrimination between these models. |
hep-ph/9909227 | Tatsuo Kobayashi | Katri Huitu, Yoshiharu Kawamura, Tatsuo Kobayashi, Kai Puolamaki | Generic Gravitational Corrections to Gauge Couplings in SUSY SU(5) GUTs | 13 pages, latex, 4 figures | Phys.Lett. B468 (1999) 111-117 | 10.1016/S0370-2693(99)01196-X | null | hep-ph | null | We study non-universal corrections to the gauge couplings due to higher
dimensional operators in supersymmetric SU(5) grand unified theories. The
corrections are, in general, parametrized by three components originating from
{\bf 24}, {\bf 75} and {\bf 200} representations. We consider the prediction of
$\alpha_3(M_Z)$ along each {\bf 24}, {\bf 75} and {\bf 200} direction, and
their linear combinations. The magnitude of GUT scale and its effects on proton
decay are discussed. Non-SUSY case is also examined.
| [
{
"created": "Thu, 2 Sep 1999 13:20:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Huitu",
"Katri",
""
],
[
"Kawamura",
"Yoshiharu",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Puolamaki",
"Kai",
""
]
] | We study non-universal corrections to the gauge couplings due to higher dimensional operators in supersymmetric SU(5) grand unified theories. The corrections are, in general, parametrized by three components originating from {\bf 24}, {\bf 75} and {\bf 200} representations. We consider the prediction of $\alpha_3(M_Z)$ along each {\bf 24}, {\bf 75} and {\bf 200} direction, and their linear combinations. The magnitude of GUT scale and its effects on proton decay are discussed. Non-SUSY case is also examined. |
hep-ph/0107109 | Alexander Studenikin | M.S. Dvornikov, A.I. Studenikin | Parametric Resonance Amplification of Neutrino Oscillations in
Electromagnetic Wave with Varying Amplitude and "Castle Wall" Magnetic Field | null | null | null | null | hep-ph | null | Within the Lorentz invariant formalizm for description of neutrino evolution
in electromagnetic fields and matter we consider neutrino spin oscillations in
the electromagnetic wave with varying amplitude and in "castle wall" magnetic
field. It is shown for the first time that the parametric resonances of
neutrino oscillations in such systems can occur.
| [
{
"created": "Tue, 10 Jul 2001 08:41:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dvornikov",
"M. S.",
""
],
[
"Studenikin",
"A. I.",
""
]
] | Within the Lorentz invariant formalizm for description of neutrino evolution in electromagnetic fields and matter we consider neutrino spin oscillations in the electromagnetic wave with varying amplitude and in "castle wall" magnetic field. It is shown for the first time that the parametric resonances of neutrino oscillations in such systems can occur. |
hep-ph/0004019 | Peter Meszaros | John N. Bahcall and Peter Meszaros | 5-10 GeV Neutrinos from Gamma-Ray Burst Fireballs | 4 pages, latex, 1 figure, aps style files. Final version, accepted in
Phys.Rev.Lett., 6/22/2000; some clarifications in the text, same conclusions | Phys.Rev.Lett.85:1362-1365,2000 | 10.1103/PhysRevLett.85.1362 | null | hep-ph astro-ph hep-ex | null | A gamma-ray burst fireball is likely to contain an admixture of neutrons, in
addition to protons, in essentially all progenitor scenarios. Inelastic
collisions between differentially streaming protons and neutrons in the
fireball produce muon neutrinos (antineutrinos) of ~ 10 GeV as well as electron
neutrinos (antineutrinos) of ~ 5 GeV, which could produce ~ 7 events/year in
kilometer cube detectors, if the neutron abundance is comparable to that of
protons. Photons of ~ 10 GeV from pi-zero decay and ~ 100 MeV electron
antineutrinos from neutron decay are also produced, but will be difficult to
detect. Photons with energies < 1 MeV from shocks following neutron decay
produce a characteristic signal which may be distinguishable from the
proton-related MeV photons.
| [
{
"created": "Tue, 4 Apr 2000 01:10:46 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Apr 2000 16:22:48 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Apr 2000 18:42:15 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Jun 2000 11:04:57 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Bahcall",
"John N.",
""
],
[
"Meszaros",
"Peter",
""
]
] | A gamma-ray burst fireball is likely to contain an admixture of neutrons, in addition to protons, in essentially all progenitor scenarios. Inelastic collisions between differentially streaming protons and neutrons in the fireball produce muon neutrinos (antineutrinos) of ~ 10 GeV as well as electron neutrinos (antineutrinos) of ~ 5 GeV, which could produce ~ 7 events/year in kilometer cube detectors, if the neutron abundance is comparable to that of protons. Photons of ~ 10 GeV from pi-zero decay and ~ 100 MeV electron antineutrinos from neutron decay are also produced, but will be difficult to detect. Photons with energies < 1 MeV from shocks following neutron decay produce a characteristic signal which may be distinguishable from the proton-related MeV photons. |
1608.01318 | Bahman Dehnadi | Mathias Butenschoen, Bahman Dehnadi, Andre H. Hoang, Vicent Mateu,
Moritz Preisser, Iain W. Stewart | Top Quark Mass Calibration for Monte Carlo Event Generators | 6 pages, 3 figures | Phys. Rev. Lett. 117, 232001 (2016) | 10.1103/PhysRevLett.117.232001 | IFT-UAM/CSIC-16-069, FTUAM-16-28, MIT-CTP 4820, UWTHPH 2016-13, DESY
16-150 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most precise top quark mass measurements use kinematic reconstruction
methods, determining the top mass parameter of a Monte Carlo event generator,
$m_t^{\rm MC}$. Due to hadronization and parton shower dynamics, relating
$m_t^{\rm MC}$ to a field theory mass is difficult. We present a calibration
procedure to determine this relation using hadron level QCD predictions for
observables with kinematic mass sensitivity. Fitting $e^+e^-$ 2-Jettiness
calculations at NLL/NNLL order to Pythia 8.205, $m_t^{\rm MC}$ differs from the
pole mass by $900$/$600$ MeV, and agrees with the MSR mass within
uncertainties, $m_t^{\rm MC}\simeq m_{t,1\,{\rm GeV}}^{\rm MSR}$.
| [
{
"created": "Wed, 3 Aug 2016 20:00:05 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"Butenschoen",
"Mathias",
""
],
[
"Dehnadi",
"Bahman",
""
],
[
"Hoang",
"Andre H.",
""
],
[
"Mateu",
"Vicent",
""
],
[
"Preisser",
"Moritz",
""
],
[
"Stewart",
"Iain W.",
""
]
] | The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, $m_t^{\rm MC}$. Due to hadronization and parton shower dynamics, relating $m_t^{\rm MC}$ to a field theory mass is difficult. We present a calibration procedure to determine this relation using hadron level QCD predictions for observables with kinematic mass sensitivity. Fitting $e^+e^-$ 2-Jettiness calculations at NLL/NNLL order to Pythia 8.205, $m_t^{\rm MC}$ differs from the pole mass by $900$/$600$ MeV, and agrees with the MSR mass within uncertainties, $m_t^{\rm MC}\simeq m_{t,1\,{\rm GeV}}^{\rm MSR}$. |
hep-ph/9403368 | null | M.Drees, R.M. Godbole, M. Nowakowski and S.D. Rindani | $\gamma \gamma $ Processes at High Energy pp Colliders | REVTEX, 12 pages, two uuencoded figures appended at the end of the
file | Phys.Rev.D50:2335-2338,1994 | 10.1103/PhysRevD.50.2335 | null | hep-ph | null | In this note we investigate the production of charged heavy particles via
\gaga\ fusion at high energy pp colliders. We revise previous claims that the
\gaga\ cross section is comparable to or larger than that for the corresponding
Drell-Yan process at high energies. Indeed we find that the \gaga\ contribution
to the total production cross section at pp is far below the Drell-Yan cross
section. As far as the individual elastic, semi-elastic and inelastic
contributions to the \gaga\ process are concerned we find that they are all of
the same order of magnitude.
| [
{
"created": "Fri, 25 Mar 1994 19:12:00 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Drees",
"M.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Nowakowski",
"M.",
""
],
[
"Rindani",
"S. D.",
""
]
] | In this note we investigate the production of charged heavy particles via \gaga\ fusion at high energy pp colliders. We revise previous claims that the \gaga\ cross section is comparable to or larger than that for the corresponding Drell-Yan process at high energies. Indeed we find that the \gaga\ contribution to the total production cross section at pp is far below the Drell-Yan cross section. As far as the individual elastic, semi-elastic and inelastic contributions to the \gaga\ process are concerned we find that they are all of the same order of magnitude. |
2305.03776 | Vin\'icius Oliveira | Ant\'onio P. Morais, Vin\'icius Oliveira, Ant\'onio Onofre, Roman
Pasechnik, Rui Santos | Exploring the viability of pseudo Nambu-Goldstone boson as ultralight
dark matter in a mass range relevant for strong gravity applications | 22 pages, 5 figures | null | null | null | hep-ph astro-ph.HE gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study a simple extension of the Standard Model featuring a dark sector
with an ultralight pseudo Nambu-Goldstone boson as dark matter candidate. We
focus on the mass range $\mathcal{O}(10^{-20} - 10^{-10})$ eV, relevant for
strong gravity applications, and explore its production and evolution in the
early Universe. The model is formulated in such a way that dark matter does not
couple directly to photons or other Standard Model particles avoiding some of
the most stringent cosmological bounds related to axion-like particles. In this
work, two different scenarios are considered depending on whether dark matter
is produced in a pre-inflationary or post-inflationary regime. We also discuss
the effect from emergent topological defects such as cosmic strings and domain
walls, and estimate the spectrum of stochastic gravitational waves produced by
their decay, enabling to test the model at current and future
gravitational-wave experiments.
| [
{
"created": "Fri, 5 May 2023 18:10:36 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 2023 14:39:02 GMT",
"version": "v2"
}
] | 2023-05-22 | [
[
"Morais",
"António P.",
""
],
[
"Oliveira",
"Vinícius",
""
],
[
"Onofre",
"António",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Santos",
"Rui",
""
]
] | We study a simple extension of the Standard Model featuring a dark sector with an ultralight pseudo Nambu-Goldstone boson as dark matter candidate. We focus on the mass range $\mathcal{O}(10^{-20} - 10^{-10})$ eV, relevant for strong gravity applications, and explore its production and evolution in the early Universe. The model is formulated in such a way that dark matter does not couple directly to photons or other Standard Model particles avoiding some of the most stringent cosmological bounds related to axion-like particles. In this work, two different scenarios are considered depending on whether dark matter is produced in a pre-inflationary or post-inflationary regime. We also discuss the effect from emergent topological defects such as cosmic strings and domain walls, and estimate the spectrum of stochastic gravitational waves produced by their decay, enabling to test the model at current and future gravitational-wave experiments. |
1202.6075 | Fu-Guang Cao | Fu-Guang Cao | Determination of the $\eta$-$\eta^\prime$ mixing angle | 5 pages, revtex, no figures, accepted for publication as a Brief
Report in Physical Review D | Phys. Rev. D 85, 057501 (2012) | 10.1103/PhysRevD.85.057501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extract $\eta$-$\eta^\prime$ mixing angle and the ratios of decay
constants of light pseudoscalar mesons $\pi^0$, $\eta$ and $\eta^\prime$ using
recently available BaBar measurements on $\eta$-photon and $\eta^\prime$-photon
transition form factors and more accurate experimental data for the masses and
two-photon decay widths of the light pseduoscalar mesons.
| [
{
"created": "Mon, 27 Feb 2012 21:22:10 GMT",
"version": "v1"
}
] | 2012-03-29 | [
[
"Cao",
"Fu-Guang",
""
]
] | We extract $\eta$-$\eta^\prime$ mixing angle and the ratios of decay constants of light pseudoscalar mesons $\pi^0$, $\eta$ and $\eta^\prime$ using recently available BaBar measurements on $\eta$-photon and $\eta^\prime$-photon transition form factors and more accurate experimental data for the masses and two-photon decay widths of the light pseduoscalar mesons. |
2305.02357 | Peter Athron | Peter Athron, Csaba Bal\'azs, Andrew Fowlie, Lachlan Morris, Lei Wu | Cosmological phase transitions: from perturbative particle physics to
gravitational waves | 155 pages, 20 figures, invited review for Progress in Particle and
Nuclear Physics; v2 matches version accepted for publication in Progress in
Particle and Nuclear Physics and includes some improvements for readability
and clearer pedagogy; v3 fix Fig 18 matching published version | Progress in Particle and Nuclear Physics 135 (2024) 104094 | 10.1016/j.ppnp.2023.104094 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves (GWs) were recently detected for the first time. This
revolutionary discovery opens a new way of learning about particle physics
through GWs from first-order phase transitions (FOPTs) in the early Universe.
FOPTs could occur when new fundamental symmetries are spontaneously broken down
to the Standard Model and are a vital ingredient in solutions of the matter
anti-matter asymmetry problem. The purpose of our work is to review the path
from a particle physics model to GWs, which contains many specialized parts, so
here we provide a timely review of all the required steps, including: (i)
building a finite-temperature effective potential in a particle physics model
and checking for FOPTs; (ii) computing transition rates; (iii) analyzing the
dynamics of bubbles of true vacuum expanding in a thermal plasma; (iv)
characterizing a transition using thermal parameters; and, finally, (v) making
predictions for GW spectra using the latest simulations and theoretical results
and considering the detectability of predicted spectra at future GW detectors.
For each step we emphasize the subtleties, advantages and drawbacks of
different methods, discuss open questions and review the state-of-art
approaches available in the literature. This provides everything a particle
physicist needs to begin exploring GW phenomenology.
| [
{
"created": "Wed, 3 May 2023 18:00:08 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2023 04:56:58 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jan 2024 08:56:34 GMT",
"version": "v3"
}
] | 2024-01-23 | [
[
"Athron",
"Peter",
""
],
[
"Balázs",
"Csaba",
""
],
[
"Fowlie",
"Andrew",
""
],
[
"Morris",
"Lachlan",
""
],
[
"Wu",
"Lei",
""
]
] | Gravitational waves (GWs) were recently detected for the first time. This revolutionary discovery opens a new way of learning about particle physics through GWs from first-order phase transitions (FOPTs) in the early Universe. FOPTs could occur when new fundamental symmetries are spontaneously broken down to the Standard Model and are a vital ingredient in solutions of the matter anti-matter asymmetry problem. The purpose of our work is to review the path from a particle physics model to GWs, which contains many specialized parts, so here we provide a timely review of all the required steps, including: (i) building a finite-temperature effective potential in a particle physics model and checking for FOPTs; (ii) computing transition rates; (iii) analyzing the dynamics of bubbles of true vacuum expanding in a thermal plasma; (iv) characterizing a transition using thermal parameters; and, finally, (v) making predictions for GW spectra using the latest simulations and theoretical results and considering the detectability of predicted spectra at future GW detectors. For each step we emphasize the subtleties, advantages and drawbacks of different methods, discuss open questions and review the state-of-art approaches available in the literature. This provides everything a particle physicist needs to begin exploring GW phenomenology. |
1704.02333 | Jiayin Gu | Gauthier Durieux, Christophe Grojean, Jiayin Gu, Kechen Wang | The leptonic future of the Higgs | 55 pages, lots of figures, v2: references added, minor corrections,
extended discussions on quadratic EFT contributions and beam polarization
effects, matches published version in JHEP | null | 10.1007/JHEP09(2017)014 | DESY 17-018 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Precision study of electroweak symmetry breaking strongly motivates the
construction of a lepton collider with center-of-mass energy of at least 240
GeV. Besides Higgsstrahlung ($e^+e^- \to hZ$), such a collider would measure
weak boson pair production ($e^+e^- \to WW$) with an astonishing precision. The
weak-boson-fusion production process ($e^+e^- \to \nu \bar{\nu} h$) provides an
increasingly powerful handle at higher center-of-mass energies. High energies
also benefit the associated top-Higgs production ($e^+e^-\to t\bar th$) that is
crucial to constrain directly the top Yukawa coupling. The impact and
complementarity of differential measurements, at different center-of-mass
energies and for several beam polarization configurations, are studied in a
global effective-field-theory framework. We define a "global determinant
parameter" (GDP) which characterizes the overall strengthening of constraints
independently of the choice of operator basis. The reach of the CEPC, CLIC,
FCC-ee, and ILC designs is assessed.
| [
{
"created": "Fri, 7 Apr 2017 18:16:59 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Sep 2017 13:07:02 GMT",
"version": "v2"
}
] | 2017-09-20 | [
[
"Durieux",
"Gauthier",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Gu",
"Jiayin",
""
],
[
"Wang",
"Kechen",
""
]
] | Precision study of electroweak symmetry breaking strongly motivates the construction of a lepton collider with center-of-mass energy of at least 240 GeV. Besides Higgsstrahlung ($e^+e^- \to hZ$), such a collider would measure weak boson pair production ($e^+e^- \to WW$) with an astonishing precision. The weak-boson-fusion production process ($e^+e^- \to \nu \bar{\nu} h$) provides an increasingly powerful handle at higher center-of-mass energies. High energies also benefit the associated top-Higgs production ($e^+e^-\to t\bar th$) that is crucial to constrain directly the top Yukawa coupling. The impact and complementarity of differential measurements, at different center-of-mass energies and for several beam polarization configurations, are studied in a global effective-field-theory framework. We define a "global determinant parameter" (GDP) which characterizes the overall strengthening of constraints independently of the choice of operator basis. The reach of the CEPC, CLIC, FCC-ee, and ILC designs is assessed. |
hep-ph/0310014 | Donini Andrea | A. Donini | NUFACT'03: The Fate of the Clones | 4 pages using epsfig. Talk given at NUFACT03, 5-11 June 2003, New
York, USA | null | 10.1063/1.1818401 | null | hep-ph | null | We present a Neutrino-Factory-based setup with three detectors of different
kind in principle capable to solve the eightfold-degeneracy in the simultaneous
measurement of $\theta_{13}$ and $\delta$, for $\theta_{13} \geq 1^\circ
(\sin^2 (2 \theta_{13}) \geq 10^{-3})$. Our setup includes a Superbeam-driven
water Cherenkov (the Superbeam conceived as the first stage of the Neutrino
Factory); two muon-storage-ring-driven detectors (namely, a large magnetized
iron calorimeter and an emulsion cloud chamber) to take advantage of both the
so-called "golden" ($\nu_e \to \nu_\mu$) and "silver" ($\nu_e \to \nu_\tau$)
channels.
| [
{
"created": "Wed, 1 Oct 2003 12:57:34 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Donini",
"A.",
""
]
] | We present a Neutrino-Factory-based setup with three detectors of different kind in principle capable to solve the eightfold-degeneracy in the simultaneous measurement of $\theta_{13}$ and $\delta$, for $\theta_{13} \geq 1^\circ (\sin^2 (2 \theta_{13}) \geq 10^{-3})$. Our setup includes a Superbeam-driven water Cherenkov (the Superbeam conceived as the first stage of the Neutrino Factory); two muon-storage-ring-driven detectors (namely, a large magnetized iron calorimeter and an emulsion cloud chamber) to take advantage of both the so-called "golden" ($\nu_e \to \nu_\mu$) and "silver" ($\nu_e \to \nu_\tau$) channels. |
hep-ph/0410027 | Fritz W. Bopp | F.W. Bopp, J. Ranft, R. Engel, and S. Roesler | d-Au and p-p collisions at RHIC and the multichain Monte Carlo
Dpmjet-III | 8 pages, 13 figures, Based on a contribution to a workshop "QCD at
Cosmic Energies, Erice, Italie, Aug.29 to Sept.5 2004 | null | null | SI-HEP-2004-11 | hep-ph | null | In this paper we compare systematically the two-component Dual Parton Model
(DPM) event generator Dpmjet-III to d-Au and p-p data from RHIC. In this
process we are able to improve the model. The need for fusion of chains and a
recalibration of the model to obtain collision scaling in h-A and d-A
collisions was found already in previous comparisons. Here, comparing to
transverse momentum distributions of identified charged hadrons we find also
the need to modify the transverse momentum distributions in the decay of
hadronic strings, the basic building blocks of the model on soft hadronic
collisions.
| [
{
"created": "Sat, 2 Oct 2004 00:41:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bopp",
"F. W.",
""
],
[
"Ranft",
"J.",
""
],
[
"Engel",
"R.",
""
],
[
"Roesler",
"S.",
""
]
] | In this paper we compare systematically the two-component Dual Parton Model (DPM) event generator Dpmjet-III to d-Au and p-p data from RHIC. In this process we are able to improve the model. The need for fusion of chains and a recalibration of the model to obtain collision scaling in h-A and d-A collisions was found already in previous comparisons. Here, comparing to transverse momentum distributions of identified charged hadrons we find also the need to modify the transverse momentum distributions in the decay of hadronic strings, the basic building blocks of the model on soft hadronic collisions. |
hep-ph/9506328 | null | Carl Carlson, Probir Roy and Marc Sher | New Bounds on R-parity Violating Couplings | Latex file, 16 pages including 6 uuencoded Postscript files appended.
Figures also available via anonymous ftp at ftp://physics.wm.edu/pub/ (get
rparity*.ps). Revised version corrects a few sentences in introduction and
adds some references | Phys.Lett. B357 (1995) 99-104 | 10.1016/0370-2693(95)00895-R | WM-95-104; TIFR/TH/95-20 | hep-ph | null | We use information from rare nonleptonic decays of heavy-quark mesons to put
new bounds on the magnitudes of certain product combinations of baryon
nonconserving R-parity violating couplings in supersymmetric models. Product
combinations of lepton and baryon nonconserving R-parity violating couplings
are also considered in the light of existing bounds on nucleon decay. Contrary
to popular impression, a few such combinations are shown to remain essentially
unconstrained.
| [
{
"created": "Wed, 14 Jun 1995 14:32:03 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 1995 18:20:15 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Carlson",
"Carl",
""
],
[
"Roy",
"Probir",
""
],
[
"Sher",
"Marc",
""
]
] | We use information from rare nonleptonic decays of heavy-quark mesons to put new bounds on the magnitudes of certain product combinations of baryon nonconserving R-parity violating couplings in supersymmetric models. Product combinations of lepton and baryon nonconserving R-parity violating couplings are also considered in the light of existing bounds on nucleon decay. Contrary to popular impression, a few such combinations are shown to remain essentially unconstrained. |
2102.12483 | Timon Emken | Timon Emken | Solar reflection of light dark matter with heavy mediators | 34 pages, 18 figures, 3 appendices. The simulation code is available
under https://github.com/temken/DaMaSCUS-SUN and version 0.1.1 is archived
under https://zenodo.org/record/5957388 . v2: Matches the version published
in PRD | Phys. Rev. D 105, 063020 (2022) | 10.1103/PhysRevD.105.063020 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The direct detection of sub-GeV dark matter particles is hampered by their
low energy deposits. If the maximum deposit allowed by kinematics falls below
the energy threshold of a direct detection experiment, it is unable to detect
these light particles. Mechanisms that boost particles from the galactic halo
can therefore extend the sensitivity of terrestrial direct dark matter searches
to lower masses. Sub-GeV and sub-MeV dark matter particles can be efficiently
accelerated by colliding with thermal nuclei and electrons of the solar plasma
respectively. This process is called 'solar reflection'. In this paper, we
present a comprehensive study of solar reflection via electron and/or nuclear
scatterings using Monte Carlo simulations of dark matter trajectories through
the Sun. We study the properties of the boosted dark matter particles, obtain
exclusion limits based on various experiments probing both electron and nuclear
recoils, and derive projections for future detectors. In addition, we find and
quantify a novel, distinct annual modulation signature of a potential solar
reflection signal which critically depends on the anisotropies of the boosted
dark matter flux ejected from the Sun. Along with this paper, we also publish
the corresponding research software.
| [
{
"created": "Wed, 24 Feb 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2022 08:07:20 GMT",
"version": "v2"
}
] | 2022-03-30 | [
[
"Emken",
"Timon",
""
]
] | The direct detection of sub-GeV dark matter particles is hampered by their low energy deposits. If the maximum deposit allowed by kinematics falls below the energy threshold of a direct detection experiment, it is unable to detect these light particles. Mechanisms that boost particles from the galactic halo can therefore extend the sensitivity of terrestrial direct dark matter searches to lower masses. Sub-GeV and sub-MeV dark matter particles can be efficiently accelerated by colliding with thermal nuclei and electrons of the solar plasma respectively. This process is called 'solar reflection'. In this paper, we present a comprehensive study of solar reflection via electron and/or nuclear scatterings using Monte Carlo simulations of dark matter trajectories through the Sun. We study the properties of the boosted dark matter particles, obtain exclusion limits based on various experiments probing both electron and nuclear recoils, and derive projections for future detectors. In addition, we find and quantify a novel, distinct annual modulation signature of a potential solar reflection signal which critically depends on the anisotropies of the boosted dark matter flux ejected from the Sun. Along with this paper, we also publish the corresponding research software. |
hep-ph/0610077 | Utpal Chattopadhyay | Utpal Chattopadhyay, Debottam Das, Partha Konar and D.P. Roy | Looking for a heavy wino LSP in collider and dark matter experiments | A discussion on non-perturbative effects on annihilation cross
section of TeV scale wino LSP added. Version to appear in Phys. Rev. D. | Phys.Rev.D75:073014,2007 | 10.1103/PhysRevD.75.073014 | null | hep-ph | null | We investigate the phenomenology of a wino LSP as obtained in AMSB and some
string models. The WMAP constraint on the DM relic density implies a wino LSP
mass of 2.0-2.3 TeV. We find a viable signature for such a heavy wino at CLIC,
operating at its highest CM energy of 5 TeV. One also expects a viable
monochromatic $\gamma$-ray signal from its pair-annihilation at the galactic
centre at least for cuspy DM halo profiles.
| [
{
"created": "Fri, 6 Oct 2006 13:42:15 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2006 14:24:37 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Apr 2007 12:08:27 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Chattopadhyay",
"Utpal",
""
],
[
"Das",
"Debottam",
""
],
[
"Konar",
"Partha",
""
],
[
"Roy",
"D. P.",
""
]
] | We investigate the phenomenology of a wino LSP as obtained in AMSB and some string models. The WMAP constraint on the DM relic density implies a wino LSP mass of 2.0-2.3 TeV. We find a viable signature for such a heavy wino at CLIC, operating at its highest CM energy of 5 TeV. One also expects a viable monochromatic $\gamma$-ray signal from its pair-annihilation at the galactic centre at least for cuspy DM halo profiles. |
1312.1219 | Jose Manuel Alarc\'on | Jose Manuel Alarc\'on, Vadim Lensky and Vladimir Pascalutsa | Chiral perturbation theory of muonic hydrogen Lamb shift: polarizability
contribution | 16 pages, 5 figures | null | 10.1140/epjc/s10052-014-2852-0 | null | hep-ph nucl-ex nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proton polarizability effect in the muonic-hydrogen Lamb shift comes out
as a prediction of baryon chiral perturbation theory at leading order and our
calculation yields for it: $\Delta E^{(\mathrm{pol})} (2P-2S) = 8^{+3}_{-1}\,
\mu$eV. This result is consistent with most of evaluations based on dispersive
sum rules, but is about a factor of two smaller than the recent result obtained
in {\em heavy-baryon} chiral perturbation theory. We also find that the effect
of $\Delta(1232)$-resonance excitation on the Lamb-shift is suppressed, as is
the entire contribution of the magnetic polarizability; the electric
polarizability dominates. Our results reaffirm the point of view that the
proton structure effects, beyond the charge radius, are too small to resolve
the `proton radius puzzle'.
| [
{
"created": "Wed, 4 Dec 2013 15:50:19 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Alarcón",
"Jose Manuel",
""
],
[
"Lensky",
"Vadim",
""
],
[
"Pascalutsa",
"Vladimir",
""
]
] | The proton polarizability effect in the muonic-hydrogen Lamb shift comes out as a prediction of baryon chiral perturbation theory at leading order and our calculation yields for it: $\Delta E^{(\mathrm{pol})} (2P-2S) = 8^{+3}_{-1}\, \mu$eV. This result is consistent with most of evaluations based on dispersive sum rules, but is about a factor of two smaller than the recent result obtained in {\em heavy-baryon} chiral perturbation theory. We also find that the effect of $\Delta(1232)$-resonance excitation on the Lamb-shift is suppressed, as is the entire contribution of the magnetic polarizability; the electric polarizability dominates. Our results reaffirm the point of view that the proton structure effects, beyond the charge radius, are too small to resolve the `proton radius puzzle'. |
hep-ph/0111439 | Ismd31 | G. Valenti | Heavy Ion Physics at LHC | 5 pages, 1 figure (in eps) talk given at XXXI International Symposium
on Multiparticle Dynamics, Sep. 1-7, 2001, Datong China URL
http://ismd31.ccnu.edu.cn/ | null | 10.1142/9789812778048_0026 | null | hep-ph | null | The study of heavy ion interactions constitutes an important part of the
experimental program outlined for the Large Hadron Collider under construction
at CERN and expected to be operational by 2006. ALICE is the single detector
having the capabilities to explore at the same time most of the characteristics
of high energy heavy ion interactions. Specific studies of jet quenching and
quarkonia production, essentially related to $\mu$ detection are also planned
by CMS.
| [
{
"created": "Fri, 30 Nov 2001 01:25:33 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Valenti",
"G.",
""
]
] | The study of heavy ion interactions constitutes an important part of the experimental program outlined for the Large Hadron Collider under construction at CERN and expected to be operational by 2006. ALICE is the single detector having the capabilities to explore at the same time most of the characteristics of high energy heavy ion interactions. Specific studies of jet quenching and quarkonia production, essentially related to $\mu$ detection are also planned by CMS. |
2403.08874 | Xiaohui Liu | Xiaohui Liu and Hua Xing Zhu | TMDs from Semi-inclusive Energy Correlators | 7 pages, 4 figures + supplemental materials (4 pages) | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We introduce a novel category of observables known as the Semi-Inclusive
Energy Correlators (SIECs), an extension of the recently proposed nucleon
energy correlator to integrate a new element, the fragmenting energy
correlation function. These SIECs gauge the correlation between the examined
hadron and the surrounding radiations, providing a comprehensive tomography of
the radiative patterns originating from initial state radiation or parton
fragmentation. As such, they could function as the generating functions for
numerous kinematic distributions. To illustrate, we find a direct relation
between the transverse momentum moments (TMMs) of the transverse
momentum-dependent (TMD) distributions and the SIECs. We demonstrate how the
TMMs of the TMD parton distributions and the fragmentation functions can be
distinctively derived from the nucleon energy correlator and the fragmenting
energy correlator, respectively, without enforcing the back-to-back kinematics.
| [
{
"created": "Wed, 13 Mar 2024 18:00:18 GMT",
"version": "v1"
}
] | 2024-03-15 | [
[
"Liu",
"Xiaohui",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | We introduce a novel category of observables known as the Semi-Inclusive Energy Correlators (SIECs), an extension of the recently proposed nucleon energy correlator to integrate a new element, the fragmenting energy correlation function. These SIECs gauge the correlation between the examined hadron and the surrounding radiations, providing a comprehensive tomography of the radiative patterns originating from initial state radiation or parton fragmentation. As such, they could function as the generating functions for numerous kinematic distributions. To illustrate, we find a direct relation between the transverse momentum moments (TMMs) of the transverse momentum-dependent (TMD) distributions and the SIECs. We demonstrate how the TMMs of the TMD parton distributions and the fragmentation functions can be distinctively derived from the nucleon energy correlator and the fragmenting energy correlator, respectively, without enforcing the back-to-back kinematics. |
hep-ph/9809502 | George Gogiberidze | G.L. Gogiberidze, L.K. Gelovani, E.K. Sarkisyan | Coherency vs. Stochasticity in Spike Production in Nuclear Collisions at
Intermediate Energies | 9 pages, LaTeX, 4 eps figs. Talk given at the 8th International
Workshop on Multiparticle Production: Correlations and Fluctuations '98
(CF98), Matrahaza, Hungary 14-21 June 1998 | null | null | null | hep-ph | null | Multiparticle spike-production process is investigated in central C-Cu
collisions at 4.5 $A$ Gev/c per nucleon. The study is based on two different
hypotheses - stochastic vs. coherent - of the formation of spikes. To observe
manifestations of the stochastic dynamics, the non-regularities in the
multiplicity distributions are analyzed using intermittency approach to a
possible phase transition as well as the one-dimensional intermittency model.
The entropy indices are calculated based on the erraticity approach. Coherency
is studied in the framework of the coherent gluon-jet radiation model. To this
end, the spike-center pseudorapidity distributions are analyzed. Coexistence of
the two mechanisms of spike formation process is discussed.
| [
{
"created": "Wed, 23 Sep 1998 14:22:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gogiberidze",
"G. L.",
""
],
[
"Gelovani",
"L. K.",
""
],
[
"Sarkisyan",
"E. K.",
""
]
] | Multiparticle spike-production process is investigated in central C-Cu collisions at 4.5 $A$ Gev/c per nucleon. The study is based on two different hypotheses - stochastic vs. coherent - of the formation of spikes. To observe manifestations of the stochastic dynamics, the non-regularities in the multiplicity distributions are analyzed using intermittency approach to a possible phase transition as well as the one-dimensional intermittency model. The entropy indices are calculated based on the erraticity approach. Coherency is studied in the framework of the coherent gluon-jet radiation model. To this end, the spike-center pseudorapidity distributions are analyzed. Coexistence of the two mechanisms of spike formation process is discussed. |
hep-ph/0102313 | Gregory Korchemsky | V.M.Braun, G.P.Korchemsky and A.N.Manashov | Evolution equation for the structure function g_2(x,Q^2) | 53 pages, 10 figures, LaTeX style | Nucl.Phys.B603:69-124,2001 | 10.1016/S0550-3213(01)00165-1 | LPT-Orsay-01-19, TPR-01-02, UB-ECM-PF-01/01 | hep-ph | null | We perform an extensive study of the scale dependence of flavor-singlet
contributions to the structure function g_2(x,Q^2) in polarized deep-inelastic
scattering. We find that the mixing between quark-antiquark-gluon and
three-gluon twist-3 operators only involves the three-gluon operator with the
lowest anomalous dimension and is weak in other cases. This means, effectively,
that only those three-gluon operators with the lowest anomalous dimension for
each moment are important, and allows to formulate a simple two-component
parton-like description of g_2(x,Q^2) in analogy with the conventional
description of twist-2 parton distributions. The similar simplification was
observed earlier for the nonsinglet distributions, although the reason is in
our case different.
| [
{
"created": "Mon, 26 Feb 2001 13:26:38 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Braun",
"V. M.",
""
],
[
"Korchemsky",
"G. P.",
""
],
[
"Manashov",
"A. N.",
""
]
] | We perform an extensive study of the scale dependence of flavor-singlet contributions to the structure function g_2(x,Q^2) in polarized deep-inelastic scattering. We find that the mixing between quark-antiquark-gluon and three-gluon twist-3 operators only involves the three-gluon operator with the lowest anomalous dimension and is weak in other cases. This means, effectively, that only those three-gluon operators with the lowest anomalous dimension for each moment are important, and allows to formulate a simple two-component parton-like description of g_2(x,Q^2) in analogy with the conventional description of twist-2 parton distributions. The similar simplification was observed earlier for the nonsinglet distributions, although the reason is in our case different. |
hep-ph/0403064 | Francisco Duraes | F.O. Dur\~aes, F.S. Navarra, M. Nielsen and M.R. Robilotta | Meson loops and the $g_{D^* D \pi}$ coupling | 8 pages, RevTex, 6 eps figures | Braz.J.Phys. 36 (2006) 1232-1237 | 10.1590/S0103-97332006000700021 | null | hep-ph nucl-th | null | The $D^*D\pi$ form factor is evaluated at low and moderate $Q^2$ in a
hadronic loop model, for off-shell $D$ mesons. The results contain arbitrary
constants, which are fixed so as to match previous QCD sum rule calculations
valid at higher $Q^2$. The form factor obtained in this way was used to extract
the coupling constant, which is in very good agreement with the experimental
value.
| [
{
"created": "Fri, 5 Mar 2004 14:07:33 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Durães",
"F. O.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Robilotta",
"M. R.",
""
]
] | The $D^*D\pi$ form factor is evaluated at low and moderate $Q^2$ in a hadronic loop model, for off-shell $D$ mesons. The results contain arbitrary constants, which are fixed so as to match previous QCD sum rule calculations valid at higher $Q^2$. The form factor obtained in this way was used to extract the coupling constant, which is in very good agreement with the experimental value. |
2103.10149 | Yago Philippe Porto Silva | Yago P. Porto-Silva, Alexei Yu. Smirnov | Coherence of oscillations in matter and supernova neutrinos | null | null | 10.1088/1475-7516/2021/06/029 | null | hep-ph astro-ph.HE hep-ex | http://creativecommons.org/licenses/by/4.0/ | We study the propagation coherence for neutrino oscillations in media with
different density profiles. For each profile, we find the dependence of the
coherence length, $L_{coh}$, on neutrino energy and address the issue of
correspondence of results in the distance and energy-momentum representations.
The key new feature in matter is existence of energy ranges with enhanced
coherence around the energies $E_0$ of "infinite coherence" at which $L_{coh}
\rightarrow \infty$. In the configuration space, the infinite coherence
corresponds to equality of the (effective) group velocities of the eigenstates.
In constant density medium, there is a unique $E_0$, which coincides with the
MSW resonance energy of oscillations of mass states and is close to the MSW
resonance energy of flavor states. In the case of massless neutrinos or
negligible masses in a very dense medium the coherence persists continuously.
In the adiabatic case, the infinite coherence is realized for periodic density
change. Adiabaticity violation changes the shape factors of the wave packets
(WPs) and leads to their spread. In a medium with sharp density changes
(jumps), splitting of the eigenstates occurs at crossing of each jump. We study
the increase of the coherence length in a single jump and periodic density
jumps - castle-wall (CW) profiles. For the CW profile, there are several $E_0$
corresponding to parametric resonances. We outlined applications of the results
for supernova neutrinos. In particular, we show that coherence between two
shock wave fronts leads to observable oscillation effects, and our analysis
suggests that the decoherence can be irrelevant for flavor transformations in
the central parts of collapsing stars.
| [
{
"created": "Thu, 18 Mar 2021 10:31:44 GMT",
"version": "v1"
}
] | 2021-06-23 | [
[
"Porto-Silva",
"Yago P.",
""
],
[
"Smirnov",
"Alexei Yu.",
""
]
] | We study the propagation coherence for neutrino oscillations in media with different density profiles. For each profile, we find the dependence of the coherence length, $L_{coh}$, on neutrino energy and address the issue of correspondence of results in the distance and energy-momentum representations. The key new feature in matter is existence of energy ranges with enhanced coherence around the energies $E_0$ of "infinite coherence" at which $L_{coh} \rightarrow \infty$. In the configuration space, the infinite coherence corresponds to equality of the (effective) group velocities of the eigenstates. In constant density medium, there is a unique $E_0$, which coincides with the MSW resonance energy of oscillations of mass states and is close to the MSW resonance energy of flavor states. In the case of massless neutrinos or negligible masses in a very dense medium the coherence persists continuously. In the adiabatic case, the infinite coherence is realized for periodic density change. Adiabaticity violation changes the shape factors of the wave packets (WPs) and leads to their spread. In a medium with sharp density changes (jumps), splitting of the eigenstates occurs at crossing of each jump. We study the increase of the coherence length in a single jump and periodic density jumps - castle-wall (CW) profiles. For the CW profile, there are several $E_0$ corresponding to parametric resonances. We outlined applications of the results for supernova neutrinos. In particular, we show that coherence between two shock wave fronts leads to observable oscillation effects, and our analysis suggests that the decoherence can be irrelevant for flavor transformations in the central parts of collapsing stars. |
1304.4458 | Gang Li | Gang Li | Hidden-charmonium decays of $Z_c(3900)$ and $Z_c(4025)$ in intermediate
meson loops model | 8 pages, 9 figures; Accepted by Eur. Phys. J. C. arXiv admin note:
text overlap with arXiv:1212.3784 | null | 10.1140/epjc/s10052-013-2621-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The BESIII collaboration reported an observation of two charged
charmonium-like structure $Z_c^{\pm}(3900)$ and $Z_c^{\pm}(4025)$ in $e^+e^-
\to (J/\psi \pi)^{\pm} \pi^{\mp}$ and $e^+e^- \to (D^* {\bar D}^*)^{\pm}
\pi^{\mp}$ at ${\sqrt s} =4.26$ GeV recently, which could be an analogue of
$Z_b(10610)$ and $Z_b(10650)$ claimed by the Belle Collaboration. In this work,
we investigate the hidden-charmonium transitions of $Z_c^{\pm}(3900)$ and
$Z_c^{\pm}(4025)$ via intermediate $D^{(*)} {D}^{(*)}$ meson loops. Reasonable
results for the branching ratios by taking appropriate values of $\alpha$ in
this model can be obtained, which shows that the intermediate $D^{(*)}
{D}^{(*)}$ meson loops process may be a possible mechanism in these decays. Our
results are consistent with the power-counting analysis, and comparable with
the calculations in the framework of nonrelativistic effective field theory to
some extent. We expect more experimental measurements on these
hidden-charmonium decays and search for the decays of $Z_c\to D{\bar D}^*
+c.c.$ and $Z_c^\prime \to D^* {\bar D}^*$, which will help us investigate the
$Z_c^{(\prime)}$ decays deeply.
| [
{
"created": "Tue, 16 Apr 2013 14:23:03 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Oct 2013 07:39:16 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Li",
"Gang",
""
]
] | The BESIII collaboration reported an observation of two charged charmonium-like structure $Z_c^{\pm}(3900)$ and $Z_c^{\pm}(4025)$ in $e^+e^- \to (J/\psi \pi)^{\pm} \pi^{\mp}$ and $e^+e^- \to (D^* {\bar D}^*)^{\pm} \pi^{\mp}$ at ${\sqrt s} =4.26$ GeV recently, which could be an analogue of $Z_b(10610)$ and $Z_b(10650)$ claimed by the Belle Collaboration. In this work, we investigate the hidden-charmonium transitions of $Z_c^{\pm}(3900)$ and $Z_c^{\pm}(4025)$ via intermediate $D^{(*)} {D}^{(*)}$ meson loops. Reasonable results for the branching ratios by taking appropriate values of $\alpha$ in this model can be obtained, which shows that the intermediate $D^{(*)} {D}^{(*)}$ meson loops process may be a possible mechanism in these decays. Our results are consistent with the power-counting analysis, and comparable with the calculations in the framework of nonrelativistic effective field theory to some extent. We expect more experimental measurements on these hidden-charmonium decays and search for the decays of $Z_c\to D{\bar D}^* +c.c.$ and $Z_c^\prime \to D^* {\bar D}^*$, which will help us investigate the $Z_c^{(\prime)}$ decays deeply. |
1411.3342 | Francesco D'Eramo | Francesco D'Eramo, Massimiliano Procura | Connecting Dark Matter UV Complete Models to Direct Detection Rates via
Effective Field Theory | 22 pages + appendices, 11 figures; v2, improved numerics, references
added, typos corrected; v3, minor changes, journal version | JHEP 1504 (2015) 054 | 10.1007/JHEP04(2015)054 | UCB-PTH-14/38, UWThPh-2014-27 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Direct searches for WIMPs are sensitive to physics well below the weak scale.
In the absence of light mediators, it is fruitful to apply an Effective Field
Theory (EFT) approach accounting only for dark matter (DM) interactions with
Standard Model (SM) fields. We consider a singlet fermion WIMP and effective
operators up to dimension 6 which are generated at the mass scale of particles
mediating DM interactions with the SM. We perform a one-loop Renormalization
Group Evolution (RGE) analysis, evolving these effective operators from the
mediators mass scale to the nuclear scales probed by direct searches. We apply
our results to models with DM velocity-suppressed interactions, DM couplings
only to heavy quarks, leptophilic DM and Higgs portal, which without our
analysis would not get constrained from direct detection bounds. Remarkably, a
large parameter space region for these models is found to be excluded as a
consequence of spin-independent couplings induced by SM loops. In addition to
these examples, we stress that more general renormalizable models for singlet
fermion WIMP can be matched onto our EFT framework, and the subsequent
model-independent RGE can be used to compute direct detection rates. Our
results allow us to properly connect the different energy scales involved in
constraining WIMP models, and to combine information from direct detection with
other complementary searches, such as collider and indirect detection.
| [
{
"created": "Wed, 12 Nov 2014 21:01:21 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Dec 2014 21:49:35 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Apr 2015 00:35:39 GMT",
"version": "v3"
}
] | 2015-04-21 | [
[
"D'Eramo",
"Francesco",
""
],
[
"Procura",
"Massimiliano",
""
]
] | Direct searches for WIMPs are sensitive to physics well below the weak scale. In the absence of light mediators, it is fruitful to apply an Effective Field Theory (EFT) approach accounting only for dark matter (DM) interactions with Standard Model (SM) fields. We consider a singlet fermion WIMP and effective operators up to dimension 6 which are generated at the mass scale of particles mediating DM interactions with the SM. We perform a one-loop Renormalization Group Evolution (RGE) analysis, evolving these effective operators from the mediators mass scale to the nuclear scales probed by direct searches. We apply our results to models with DM velocity-suppressed interactions, DM couplings only to heavy quarks, leptophilic DM and Higgs portal, which without our analysis would not get constrained from direct detection bounds. Remarkably, a large parameter space region for these models is found to be excluded as a consequence of spin-independent couplings induced by SM loops. In addition to these examples, we stress that more general renormalizable models for singlet fermion WIMP can be matched onto our EFT framework, and the subsequent model-independent RGE can be used to compute direct detection rates. Our results allow us to properly connect the different energy scales involved in constraining WIMP models, and to combine information from direct detection with other complementary searches, such as collider and indirect detection. |
2003.12606 | Valentina De Romeri | Valentina De Romeri, Dimitrios Karamitros, Oleg Lebedev, Takashi Toma | Neutrino dark matter and the Higgs portal: improved freeze-in analysis | 44 pages, 12 figures. Minor changes, matches JHEP version | null | 10.1007/JHEP10(2020)137 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sterile neutrinos are one of the leading dark matter candidates. Their masses
may originate from a vacuum expectation value of a scalar field. If the sterile
neutrino couplings are very small and their direct coupling to the inflaton is
forbidden by the lepton number symmetry, the leading dark matter production
mechanism is the freeze-in scenario. We study this possibility in the neutrino
mass range up to 1 GeV, taking into account relativistic production rates based
on the Bose-Einstein statistics, thermal masses and phase transition effects.
The specifics of the production mechanism and the dominant mode depend on the
relation between the scalar and sterile neutrino masses as well as on whether
or not the scalar is thermalized. We find that the observed dark matter
abundance can be produced in all of the cases considered. We also revisit the
freeze-in production of a Higgs portal scalar, pointing out the importance of a
fusion mode, as well as the thermalization constraints.
| [
{
"created": "Fri, 27 Mar 2020 19:22:06 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2020 09:47:34 GMT",
"version": "v2"
}
] | 2020-12-02 | [
[
"De Romeri",
"Valentina",
""
],
[
"Karamitros",
"Dimitrios",
""
],
[
"Lebedev",
"Oleg",
""
],
[
"Toma",
"Takashi",
""
]
] | Sterile neutrinos are one of the leading dark matter candidates. Their masses may originate from a vacuum expectation value of a scalar field. If the sterile neutrino couplings are very small and their direct coupling to the inflaton is forbidden by the lepton number symmetry, the leading dark matter production mechanism is the freeze-in scenario. We study this possibility in the neutrino mass range up to 1 GeV, taking into account relativistic production rates based on the Bose-Einstein statistics, thermal masses and phase transition effects. The specifics of the production mechanism and the dominant mode depend on the relation between the scalar and sterile neutrino masses as well as on whether or not the scalar is thermalized. We find that the observed dark matter abundance can be produced in all of the cases considered. We also revisit the freeze-in production of a Higgs portal scalar, pointing out the importance of a fusion mode, as well as the thermalization constraints. |
1102.5702 | Sergei Gninenko | S.N. Gninenko, A.Yu. Ignatiev, and V.A. Matveev | Two photon decay of Z' as a probe of Bose symmetry violation at the CERN
LHC | 10 pages, 3 figures. Published version, but with extended
introductory discussion | Int.J.Mod.Phys. A26 (2011) 4367-4385 | 10.1142/S0217751X11054528 | null | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question if the Bose statistics is broken at the TeV scale is discussed.
The decay of a new heavy spin 1 gauge boson Z' into two photons, Z'-> 2 gamma,
is forbidden by the Bose statistics among other general principles of quantum
field theory (Landau-Yang theorem). We point out that the search for this decay
can be effectively used to probe the Bose symmetry violation at the CERN LHC.
| [
{
"created": "Mon, 28 Feb 2011 16:18:48 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Oct 2011 09:19:59 GMT",
"version": "v2"
}
] | 2011-10-18 | [
[
"Gninenko",
"S. N.",
""
],
[
"Ignatiev",
"A. Yu.",
""
],
[
"Matveev",
"V. A.",
""
]
] | The question if the Bose statistics is broken at the TeV scale is discussed. The decay of a new heavy spin 1 gauge boson Z' into two photons, Z'-> 2 gamma, is forbidden by the Bose statistics among other general principles of quantum field theory (Landau-Yang theorem). We point out that the search for this decay can be effectively used to probe the Bose symmetry violation at the CERN LHC. |
0902.0865 | Ingrid Kraus | H. Oeschler | Strangeness Production at 1 - 2 A GeV | 7 pages, 7 figures, conference contribution for "International school
of nuclear physics", Erice, Sicily, 16 - 24 September 2008 | null | 10.1016/j.ppnp.2008.12.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of K+ and K- mesons below and at the NN threshold is
summarized, based on a comparison of data with transport model calculations. K+
mesons are created in associate production together with hyperons (e.g. Lambda)
in multi-step processes involving Delta resonances. These processes occur
mainly during the high-density phase of the collision and this makes the K+ an
ideal tool to extract the stiffness of the nuclear equation of state, found to
be rather soft with a compressibility modulus K below 240 MeV. In contrast, the
major part of K- mesons are produced via strangeness exchange. Most of the
created K- are absorbed and the surviving ones are emitted quite late and at
low densities.
| [
{
"created": "Thu, 5 Feb 2009 08:43:21 GMT",
"version": "v1"
}
] | 2009-02-06 | [
[
"Oeschler",
"H.",
""
]
] | The production of K+ and K- mesons below and at the NN threshold is summarized, based on a comparison of data with transport model calculations. K+ mesons are created in associate production together with hyperons (e.g. Lambda) in multi-step processes involving Delta resonances. These processes occur mainly during the high-density phase of the collision and this makes the K+ an ideal tool to extract the stiffness of the nuclear equation of state, found to be rather soft with a compressibility modulus K below 240 MeV. In contrast, the major part of K- mesons are produced via strangeness exchange. Most of the created K- are absorbed and the surviving ones are emitted quite late and at low densities. |
hep-ph/9306208 | Frans Klinkhamer | F. R. Klinkhamer | Existence of a New Instanton in Constrained Yang-Mills-Higgs Theory | 32 pages, Latex, NIKHEF-H/93-02 (March 1993), postscript file
including 10 figures available by anonymous ftp from nikhefh.nikhef.nl | Nucl.Phys. B407 (1993) 88-114 | 10.1016/0550-3213(93)90275-T | null | hep-ph | null | Our goal is to discover possible new 4-dimensional euclidean solutions
(instantons) in fundamental SU(2) Yang-Mills-Higgs theory, with a constraint
added to prevent collapse of the scale. We show that, most likely, there exists
one particular new constrained instanton (\Istar) with vanishing Pontryagin
index. This is based on a topological argument that involves the construction
of a non-contractible loop of 4-dimensional configurations with a certain
upperbound on the action, which we establish numerically. We expect \Istar to
be the lowest action non-trivial solution in the vacuum sector of the theory.
There also exists a related static, but unstable, solution, the new sphaleron
\Sstar. Possible applications of \Istar to the electroweak interactions include
the asymptotics of perturbation theory and the high-energy behaviour of the
total cross-section.
| [
{
"created": "Wed, 2 Jun 1993 10:06:11 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Klinkhamer",
"F. R.",
""
]
] | Our goal is to discover possible new 4-dimensional euclidean solutions (instantons) in fundamental SU(2) Yang-Mills-Higgs theory, with a constraint added to prevent collapse of the scale. We show that, most likely, there exists one particular new constrained instanton (\Istar) with vanishing Pontryagin index. This is based on a topological argument that involves the construction of a non-contractible loop of 4-dimensional configurations with a certain upperbound on the action, which we establish numerically. We expect \Istar to be the lowest action non-trivial solution in the vacuum sector of the theory. There also exists a related static, but unstable, solution, the new sphaleron \Sstar. Possible applications of \Istar to the electroweak interactions include the asymptotics of perturbation theory and the high-energy behaviour of the total cross-section. |
hep-ph/0003310 | Xiao-Gang He | Xiao-Gang He (NTU) | CP Violation in the SM and Beyond in Hadronic B Decays | Talk presented at PASCOS'99, Dec. 10-16, 1999, Tahoe, California.
Latex 6 pages including two figures | null | 10.1142/9789812792433_0025 | null | hep-ph | null | Three different methods, using $B_d\to J/\psi K_S$, $J/\psi K_S \pi^0$,
$B_d\to K^-\pi^+, \pi^+\pi^-$ and $B_u\to K^- \pi^0, \bar K^0 \pi^-,
\pi^-\pi^0$, to extract hadronic model independent information about new
physics are discussed in this talk.
| [
{
"created": "Fri, 31 Mar 2000 07:23:46 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"He",
"Xiao-Gang",
"",
"NTU"
]
] | Three different methods, using $B_d\to J/\psi K_S$, $J/\psi K_S \pi^0$, $B_d\to K^-\pi^+, \pi^+\pi^-$ and $B_u\to K^- \pi^0, \bar K^0 \pi^-, \pi^-\pi^0$, to extract hadronic model independent information about new physics are discussed in this talk. |
hep-ph/9402223 | null | N.I. Ussyukina and A.I. Davydychev | New results for two-loop off-shell three-point diagrams | 10 pages, 3 figures, standard LaTEX (PS-file is also available by
anonymous FTP at node VSFYS1.FI.UIB.NO in subdirectory DAVYDYCHEV, the file
BERGEN94-03.PS), Bergen Scientific/Technical Report No.1994-03 | Phys.Lett. B332 (1994) 159-167 | 10.1016/0370-2693(94)90874-5 | null | hep-ph | null | A number of exact results for two-loop three-point diagrams with massless
internal particles and arbitrary (off-shell) external momenta are presented.
Divergent contributions are calculated in the framework of dimensional
regularization.
| [
{
"created": "Thu, 3 Feb 1994 17:56:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ussyukina",
"N. I.",
""
],
[
"Davydychev",
"A. I.",
""
]
] | A number of exact results for two-loop three-point diagrams with massless internal particles and arbitrary (off-shell) external momenta are presented. Divergent contributions are calculated in the framework of dimensional regularization. |
1201.4614 | Salah Nasri | Amine Ahriche (Jijel U.), Salah Nasri (United Arab Emirates U.) | Light Dark Matter, Light Higgs and the Electroweak Phase Transition | figures updated, references added. Published in PRD | Phys. Rev. D 85, 093007 (2012) | 10.1103/PhysRevD.85.093007 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a minimal extension of the Standard Model by two real singlet
fields that could provide a good candidate for light Dark Matter, and give a
strong first order electroweak phase transition. As a result, there are two CP
even scalars; one is lighter than \sim 70 GeV, and the other one with mass in
the range of 280-400 GeV; and consistent with electroweak precision tests. We
show that the light scalar mass can be as small as 25 GeV while still being
consistent with the LEP data. The predicted dark matter scattering cross
section is large enough to accommodate CoGeNT and can be probed by future XENON
experiment. We also show that for dark matter mass around 2 GeV, the branching
fraction of the process (B^+\rightarrowK^++2(DM)) can be accessible in SuperB
factories.
| [
{
"created": "Sun, 22 Jan 2012 23:58:35 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2012 11:25:55 GMT",
"version": "v2"
},
{
"created": "Thu, 17 May 2012 13:10:59 GMT",
"version": "v3"
}
] | 2012-05-18 | [
[
"Ahriche",
"Amine",
"",
"Jijel U."
],
[
"Nasri",
"Salah",
"",
"United Arab Emirates U."
]
] | We propose a minimal extension of the Standard Model by two real singlet fields that could provide a good candidate for light Dark Matter, and give a strong first order electroweak phase transition. As a result, there are two CP even scalars; one is lighter than \sim 70 GeV, and the other one with mass in the range of 280-400 GeV; and consistent with electroweak precision tests. We show that the light scalar mass can be as small as 25 GeV while still being consistent with the LEP data. The predicted dark matter scattering cross section is large enough to accommodate CoGeNT and can be probed by future XENON experiment. We also show that for dark matter mass around 2 GeV, the branching fraction of the process (B^+\rightarrowK^++2(DM)) can be accessible in SuperB factories. |
hep-ph/0512041 | Pedro Bicudo | P. Bicudo | A quark model suggestion against Ds*(2317) and Ds*(2460) as chiral
partners of standard Ds | 8 pages, 2 tables, 4 figures, longer version | Phys.Rev.D74:036008,2006 | 10.1103/PhysRevD.74.036008 | null | hep-ph | null | This paper presents the first study of mesons with a quark and an antiquark
with different and finite masses, in a simple confining and chiral invariant
quark-antiquark interaction, leading to spontaneous chiral symmetry breaking
and to constituent quarks. In the false chiral invariant vacuum, the chiral
partners are degenerate, and tachyons occur in the light-light spectrum. In the
true vacuum, most of the standard non-relativistic quark model spectra should
be recovered except for the pion and other particular constraints. The
calibration problem of chiral quark models is also addressed here. The detailed
inspection of the different contributions to the D and Ds masses suggests that
the challenging recently observed Ds*(2317) and Ds*(2460) mesons might not fit
as global chirally rotated quark-antiquark Ds mesons.
| [
{
"created": "Fri, 2 Dec 2005 20:08:17 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Dec 2005 19:16:49 GMT",
"version": "v2"
},
{
"created": "Tue, 30 May 2006 18:51:40 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bicudo",
"P.",
""
]
] | This paper presents the first study of mesons with a quark and an antiquark with different and finite masses, in a simple confining and chiral invariant quark-antiquark interaction, leading to spontaneous chiral symmetry breaking and to constituent quarks. In the false chiral invariant vacuum, the chiral partners are degenerate, and tachyons occur in the light-light spectrum. In the true vacuum, most of the standard non-relativistic quark model spectra should be recovered except for the pion and other particular constraints. The calibration problem of chiral quark models is also addressed here. The detailed inspection of the different contributions to the D and Ds masses suggests that the challenging recently observed Ds*(2317) and Ds*(2460) mesons might not fit as global chirally rotated quark-antiquark Ds mesons. |
hep-ph/9810527 | Mikko Vanttinen | M. V\"anttinen, L. Mankiewicz (TU Munich), and E. Stein (INFN Sezione
di Torino) | Higher-twist contributions in exclusive processes | 4 pages, 2 figures (Latex2e, Postscript, style file b98proc.cls
included); talk given in the Baryons'98 conference, Bonn, Germany, Sept.
22-26, 1998 | null | null | null | hep-ph | null | Using the renormalon technique, we estimate higher-twist contributions in
deeply virtual Compton scattering and in hard exclusive $\pi^0$
leptoproduction.
| [
{
"created": "Thu, 29 Oct 1998 15:55:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vänttinen",
"M.",
"",
"TU Munich"
],
[
"Mankiewicz",
"L.",
"",
"TU Munich"
],
[
"Stein",
"E.",
"",
"INFN Sezione\n di Torino"
]
] | Using the renormalon technique, we estimate higher-twist contributions in deeply virtual Compton scattering and in hard exclusive $\pi^0$ leptoproduction. |
hep-ph/9705418 | Jacek Ziabicki | Merle Michael Robinson and Jacek Ziabicki | Spontaneous CP Violation in Models with Anomalous U(1) | 14 pages, 1 figure included in text, plain LaTeX | null | null | EFI-97-22 | hep-ph | null | We examine a class of Froggatt-Nielsen models with an anomalous U(1) as the
flavor dependent symmetry. Anomaly cancellation and unbroken supersymmetry
impose constraints on the U(1)_X charges of the fermions and the vacuum
expectation values of the symmetry-breaking scalars. We show by example that it
is possible to find models that reproduce the observed masses and mixings of
the standard model fermions, and exhibit a realistic amount of CP violation.
| [
{
"created": "Mon, 26 May 1997 02:23:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Robinson",
"Merle Michael",
""
],
[
"Ziabicki",
"Jacek",
""
]
] | We examine a class of Froggatt-Nielsen models with an anomalous U(1) as the flavor dependent symmetry. Anomaly cancellation and unbroken supersymmetry impose constraints on the U(1)_X charges of the fermions and the vacuum expectation values of the symmetry-breaking scalars. We show by example that it is possible to find models that reproduce the observed masses and mixings of the standard model fermions, and exhibit a realistic amount of CP violation. |
hep-ph/9805314 | Borzumati Francesca | Francesca Borzumati, Glennys Farrar, Nir Polonsky, and Scott Thomas | Fermion Masses without Yukawa Couplings | 10 pages, Latex+sprocl.sty (included). To appear in the Proceedings
of the Workshop on Phenomenological Aspects of String Theory (PAST), 2-4 Oct
1997, Trieste | null | null | ZU-TH 10/98, RU-98-18, SU-ITP 98-30 | hep-ph | null | Radiatively generated fermion masses without tree level Yukawa couplings are
re-analyzed within supersymmetric models. Special emphasis is given to the
possible appearance of color and charge breaking vacua. Several scenarios in
which the radiative mechanism can be accomodated for the first, second, and
third generation fermion masses are presented. Some of these require a low
scale of supersymmetry breaking.
| [
{
"created": "Wed, 13 May 1998 17:53:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Borzumati",
"Francesca",
""
],
[
"Farrar",
"Glennys",
""
],
[
"Polonsky",
"Nir",
""
],
[
"Thomas",
"Scott",
""
]
] | Radiatively generated fermion masses without tree level Yukawa couplings are re-analyzed within supersymmetric models. Special emphasis is given to the possible appearance of color and charge breaking vacua. Several scenarios in which the radiative mechanism can be accomodated for the first, second, and third generation fermion masses are presented. Some of these require a low scale of supersymmetry breaking. |
1603.03930 | Gregory Adkins | Gregory S. Adkins, Lam M. Tran, Ruihan Wang | Positronium energy levels at order $m \alpha^7$: Product contributions
in the two-photon-annihilation channel | 11 pages, 4 figures | Phys. Rev. A 93, 052511 (2016) | 10.1103/PhysRevA.93.052511 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ongoing improvements in the measurement of positronium transition intervals
motivate the calculation of the $O(m \alpha^7)$ corrections to these intervals.
In this work we focus on corrections to the spin-singlet parapositronium
energies involving virtual annihilation to two photons in an intermediate
state. We have evaluated all contributions to the positronium S-state energy
levels that can be written as the product of a one-loop correction on one side
of the annihilation event and another one-loop correction on the other side.
These effects contribute $\Delta E = -0.561971(25) m \alpha^7/\pi^3$ to the
parapositronium ground state energy.
| [
{
"created": "Sat, 12 Mar 2016 15:26:36 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Adkins",
"Gregory S.",
""
],
[
"Tran",
"Lam M.",
""
],
[
"Wang",
"Ruihan",
""
]
] | Ongoing improvements in the measurement of positronium transition intervals motivate the calculation of the $O(m \alpha^7)$ corrections to these intervals. In this work we focus on corrections to the spin-singlet parapositronium energies involving virtual annihilation to two photons in an intermediate state. We have evaluated all contributions to the positronium S-state energy levels that can be written as the product of a one-loop correction on one side of the annihilation event and another one-loop correction on the other side. These effects contribute $\Delta E = -0.561971(25) m \alpha^7/\pi^3$ to the parapositronium ground state energy. |
0903.1813 | Motoi Endo | Motoi Endo and Tetsuo Shindou | R-parity Violating Right-Handed Neutrino in Gravitino Dark Matter
Scenario | 13 pages, 1 figure | JHEP 0909:037,2009 | 10.1088/1126-6708/2009/09/037 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A decay of the gravitino dark matter is an attractive candidate to explain
the current excesses of the PAMELA/ATIC cosmic-ray data. However, R-parity
violations are required to be very tiny in low-energy scale. We suggest a
R-parity violation in the right-handed neutrino sector. The violation is
suppressed by a see-saw mechanism. Although a reheating temperature is
constrained from above, the thermal leptogenesis is found to work successfully
with a help of the R-parity violating right-handed neutrino.
| [
{
"created": "Tue, 10 Mar 2009 16:45:39 GMT",
"version": "v1"
}
] | 2009-09-28 | [
[
"Endo",
"Motoi",
""
],
[
"Shindou",
"Tetsuo",
""
]
] | A decay of the gravitino dark matter is an attractive candidate to explain the current excesses of the PAMELA/ATIC cosmic-ray data. However, R-parity violations are required to be very tiny in low-energy scale. We suggest a R-parity violation in the right-handed neutrino sector. The violation is suppressed by a see-saw mechanism. Although a reheating temperature is constrained from above, the thermal leptogenesis is found to work successfully with a help of the R-parity violating right-handed neutrino. |
2110.15604 | Jan-e Alam Professor | Sushant K. Singh and Jan-e Alam | Suppression of thermal vorticity as an indicator of QCD critical point | Latex file, 15 figures including supplementary material | null | null | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study the impact of the QCD critical point (CP) on the spin polarization
of $\Lambda$-hyperon generated by the thermal vorticity in viscous quark gluon
plasma (QGP). The equations of the relativistic causal viscous hydrodynamics
have been solved numerically in (3+1) dimensions to evaluate the thermal
vorticity. The effects of the CP have been incorporated through the equation of
state (EoS) and the scaling behavior of the transport coefficients. A
significant reduction in the global polarization has been found as the CP is
approached. A drastic change induced by the CP in the rapidity dependence of
the spin polarization is observed which can be used as a signature of the CP.
| [
{
"created": "Fri, 29 Oct 2021 08:08:31 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2021 11:37:21 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Nov 2022 13:19:36 GMT",
"version": "v3"
}
] | 2022-12-01 | [
[
"Singh",
"Sushant K.",
""
],
[
"Alam",
"Jan-e",
""
]
] | We study the impact of the QCD critical point (CP) on the spin polarization of $\Lambda$-hyperon generated by the thermal vorticity in viscous quark gluon plasma (QGP). The equations of the relativistic causal viscous hydrodynamics have been solved numerically in (3+1) dimensions to evaluate the thermal vorticity. The effects of the CP have been incorporated through the equation of state (EoS) and the scaling behavior of the transport coefficients. A significant reduction in the global polarization has been found as the CP is approached. A drastic change induced by the CP in the rapidity dependence of the spin polarization is observed which can be used as a signature of the CP. |
hep-ph/9909369 | Shang-Yung Wang | D. Boyanovsky, H.J. de Vega, S.-Y. Wang | Dynamical Renormalization Group Approach to Quantum Kinetics in Scalar
and Gauge Theories | RevTeX, 40 pages, 4 eps figures, published version | Phys.Rev. D61 (2000) 065006 | 10.1103/PhysRevD.61.065006 | null | hep-ph cond-mat nucl-th | null | We derive quantum kinetic equations from a quantum field theory implementing
a diagrammatic perturbative expansion improved by a resummation via the
dynamical renormalization group. The method begins by obtaining the equation of
motion of the distribution function in perturbation theory. The solution of
this equation of motion reveals secular terms that grow in time, the dynamical
renormalization group resums these secular terms in real time and leads
directly to the quantum kinetic equation. We used this method to study the
relaxation in a cool gas of pions and sigma mesons in the O(4) chiral linear
sigma model. We obtain in relaxation time approximation the pion and sigma
meson relaxation rates. We also find that in large momentum limit emission and
absorption of massless pions result in threshold infrared divergence in sigma
meson relaxation rate and lead to a crossover behavior in relaxation. We then
study the relaxation of charged quasiparticles in scalar electrodynamics
(SQED). While longitudinal, Debye screened photons lead to purely exponential
relaxation, transverse photons, only dynamically screened by Landau damping
lead to anomalous relaxation, thus leading to a crossover between two different
relaxational regimes. We emphasize that infrared divergent damping rates are
indicative of non-exponential relaxation and the dynamical renormalization
group reveals the correct relaxation directly in real time. Finally we also
show that this method provides a natural framework to interpret and resolve the
issue of pinch singularities out of equilibrium and establish a direct
correspondence between pinch singularities and secular terms. We argue that
this method is particularly well suited to study quantum kinetics and transport
in gauge theories.
| [
{
"created": "Tue, 14 Sep 1999 16:35:01 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2000 04:13:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Boyanovsky",
"D.",
""
],
[
"de Vega",
"H. J.",
""
],
[
"Wang",
"S. -Y.",
""
]
] | We derive quantum kinetic equations from a quantum field theory implementing a diagrammatic perturbative expansion improved by a resummation via the dynamical renormalization group. The method begins by obtaining the equation of motion of the distribution function in perturbation theory. The solution of this equation of motion reveals secular terms that grow in time, the dynamical renormalization group resums these secular terms in real time and leads directly to the quantum kinetic equation. We used this method to study the relaxation in a cool gas of pions and sigma mesons in the O(4) chiral linear sigma model. We obtain in relaxation time approximation the pion and sigma meson relaxation rates. We also find that in large momentum limit emission and absorption of massless pions result in threshold infrared divergence in sigma meson relaxation rate and lead to a crossover behavior in relaxation. We then study the relaxation of charged quasiparticles in scalar electrodynamics (SQED). While longitudinal, Debye screened photons lead to purely exponential relaxation, transverse photons, only dynamically screened by Landau damping lead to anomalous relaxation, thus leading to a crossover between two different relaxational regimes. We emphasize that infrared divergent damping rates are indicative of non-exponential relaxation and the dynamical renormalization group reveals the correct relaxation directly in real time. Finally we also show that this method provides a natural framework to interpret and resolve the issue of pinch singularities out of equilibrium and establish a direct correspondence between pinch singularities and secular terms. We argue that this method is particularly well suited to study quantum kinetics and transport in gauge theories. |
hep-ph/9211327 | null | P.M. Stevenson | Response to Brodsky and Lu's Letter "On the Self-Consistency of
Scale-Setting Methods | 4 pages, LaTeX | null | null | DE-FG05-92ER40717-2 | hep-ph | null | The claim that the Principle of Minimal Sensitivity is "disfavored" because
it does not satisfy certain "self-consistency requirements" is meaningless, and
shows a basic misunderstanding of the renormalization-scheme-dependence
problem.
| [
{
"created": "Fri, 27 Nov 1992 21:47:00 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 1992 19:42:00 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Stevenson",
"P. M.",
""
]
] | The claim that the Principle of Minimal Sensitivity is "disfavored" because it does not satisfy certain "self-consistency requirements" is meaningless, and shows a basic misunderstanding of the renormalization-scheme-dependence problem. |
2202.00167 | Ismail Zahed | Edward Shuryak and Ismail Zahed | Hadronic structure on the light-front IV: Heavy and light Baryons | 24 pages, 12 figures | null | 10.1103/PhysRevD.107.034026 | null | hep-ph hep-lat nucl-th | http://creativecommons.org/licenses/by/4.0/ | This work is a continuation in our series of papers, that addresses quark
models of hadronic structure on the light front. The chief focus of this paper
is the quantum-mechanical solution of the three-quark model Hamiltonian,
describing baryons. In Jacobi coordinates, we use a harmonic oscillator basis
for the transverse directions. For the longitudinal momentum fractions $x_i$,
the pertinent basis follows from quantum mechanics in a "triangular cup"
potential, which we solve exactly. We calculate the masses and light front wave
functions for the flavor symmetric $\frac 32^+$ baryons $bbb,ccc,sss,uuu$.
| [
{
"created": "Tue, 1 Feb 2022 00:50:48 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2022 14:52:32 GMT",
"version": "v2"
}
] | 2023-03-08 | [
[
"Shuryak",
"Edward",
""
],
[
"Zahed",
"Ismail",
""
]
] | This work is a continuation in our series of papers, that addresses quark models of hadronic structure on the light front. The chief focus of this paper is the quantum-mechanical solution of the three-quark model Hamiltonian, describing baryons. In Jacobi coordinates, we use a harmonic oscillator basis for the transverse directions. For the longitudinal momentum fractions $x_i$, the pertinent basis follows from quantum mechanics in a "triangular cup" potential, which we solve exactly. We calculate the masses and light front wave functions for the flavor symmetric $\frac 32^+$ baryons $bbb,ccc,sss,uuu$. |
hep-ph/0601195 | Shi-Yuan Li | Wei Han, Shi-Yuan Li, Zong-Guo Si and Zhong-Juan Yang | Colour Connection and Diquark Fragmentation in e^+e^- \to c \bar c q
\bar q \to h's Process | 10 pages, 7 figures and 1 table in latex with axodraw.sty, version to
appear in PLB | Phys.Lett.B642:62-67,2006 | 10.1016/j.physletb.2006.08.067 | SDU-HEP200601 | hep-ph | null | The hadronization effects induced by different colour connections of
$c\bar{c}q\bar{q}$ system in $e^+e^-$ annihilation are investigated by a toy
model where diquark fragmentation is employed based on Pythia. It is found that
the correlations between the charm baryons and charm antibaryons produced via
diquark pair fragmentation are much stronger, and their momentum spectra are
harder than those from the standard colour connection in Pythia.
| [
{
"created": "Tue, 24 Jan 2006 11:15:15 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2006 16:58:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Han",
"Wei",
""
],
[
"Li",
"Shi-Yuan",
""
],
[
"Si",
"Zong-Guo",
""
],
[
"Yang",
"Zhong-Juan",
""
]
] | The hadronization effects induced by different colour connections of $c\bar{c}q\bar{q}$ system in $e^+e^-$ annihilation are investigated by a toy model where diquark fragmentation is employed based on Pythia. It is found that the correlations between the charm baryons and charm antibaryons produced via diquark pair fragmentation are much stronger, and their momentum spectra are harder than those from the standard colour connection in Pythia. |
2312.11833 | Dibyendu Nanda | Talal Ahmed Chowdhury, Kareem Ezzat, Shaaban Khalil, Ernest Ma,
Dibyendu Nanda | Higgs Quadruplet Impact on $W$ Mass Shift, Dark Matter, and LHC
Signatures | 7 pages, 5 fugures, 1 table, matches the version accepted for
publication in PRD | Phys. Rev. D 109, 075039 (2024) | 10.1103/PhysRevD.109.075039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The addition of a Higgs quadruplet to the standard model (SM) of quarks and
leptons would shift the $W$ boson mass upward. It could also facilitate the
production of dark matter through the conventional thermal freeze-out scenario
via Yukawa interaction with the Higgs quadruplet or freeze-in production from
the decay of SM Higgs. We investigate the same-sign lepton smoking gun
signature of the double-charged scalar component of the Quadruplet Higgs at the
LHC.
| [
{
"created": "Tue, 19 Dec 2023 04:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2024 18:03:12 GMT",
"version": "v2"
}
] | 2024-04-25 | [
[
"Chowdhury",
"Talal Ahmed",
""
],
[
"Ezzat",
"Kareem",
""
],
[
"Khalil",
"Shaaban",
""
],
[
"Ma",
"Ernest",
""
],
[
"Nanda",
"Dibyendu",
""
]
] | The addition of a Higgs quadruplet to the standard model (SM) of quarks and leptons would shift the $W$ boson mass upward. It could also facilitate the production of dark matter through the conventional thermal freeze-out scenario via Yukawa interaction with the Higgs quadruplet or freeze-in production from the decay of SM Higgs. We investigate the same-sign lepton smoking gun signature of the double-charged scalar component of the Quadruplet Higgs at the LHC. |
2407.08673 | Jonathan Leon Schubert | Jonathan L. Schubert (1 and 2), Babette D\"obrich (2), Jan Jerhot (2),
Tommaso Spadaro (3) ((1) Technical University of Munich, (2)
Max-Planck-Institut f\"ur Physik, (3) Laboratori Nazionali di Frascati dell
INFN) | On the impact of heavy meson production spectra on searches for heavy
neutral leptons | 50 pages, 22 figures, uses jheppub.sty | null | null | MPP-2024-129 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Feebly Interacting Particles are a commonly considered extension to the
Standard Model of Particle Physics. In many theoretical frameworks these
particles can explain observed physical phenomena which are in tension with the
current model. \textsc{ALPiNIST} is a simplified Monte Carlo framework aimed at
evaluating past, present, and future, short and long baseline experiments for
their sensitivities to different models of Axion-Like Particles. We present the
extension of this framework to accommodate new classes of Feebly Interacting
Particles with emphasis on Heavy Neutral Leptons. This extension is especially
well motivated, solving multiple of the standing issues with the Standard Model
at the same time. The fundamental importance of inputs on the resulting
parameter sensitivity, and thus the need for a unified simulation set-up, is
highlighted.
| [
{
"created": "Thu, 11 Jul 2024 17:05:08 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Schubert",
"Jonathan L.",
"",
"1 and 2"
],
[
"Döbrich",
"Babette",
""
],
[
"Jerhot",
"Jan",
""
],
[
"Spadaro",
"Tommaso",
""
]
] | Feebly Interacting Particles are a commonly considered extension to the Standard Model of Particle Physics. In many theoretical frameworks these particles can explain observed physical phenomena which are in tension with the current model. \textsc{ALPiNIST} is a simplified Monte Carlo framework aimed at evaluating past, present, and future, short and long baseline experiments for their sensitivities to different models of Axion-Like Particles. We present the extension of this framework to accommodate new classes of Feebly Interacting Particles with emphasis on Heavy Neutral Leptons. This extension is especially well motivated, solving multiple of the standing issues with the Standard Model at the same time. The fundamental importance of inputs on the resulting parameter sensitivity, and thus the need for a unified simulation set-up, is highlighted. |
hep-ph/0002192 | Stephen Wong | J.I. Kapusta and S.M.H. Wong | Modification of Z Boson Properties in Quark-Gluon Plasma | 7 pages latex file with 6 embedded PS figures | Phys.Rev. D62 (2000) 037301 | 10.1103/PhysRevD.62.037301 | NUC-MINN-00/05-T | hep-ph nucl-th | null | We calculate the change in the effective mass and width of a Z boson in the
environment of a quark-gluon plasma under the conditions expected in Pb-Pb
collisions at the LHC. The change in width is predicted to be only about 1 MeV
at a temperature of 1 GeV, compared to the natural width of 2490$\pm$7 MeV. The
mass shift is even smaller. Hence no observable effects are to be expected.
| [
{
"created": "Thu, 17 Feb 2000 22:12:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kapusta",
"J. I.",
""
],
[
"Wong",
"S. M. H.",
""
]
] | We calculate the change in the effective mass and width of a Z boson in the environment of a quark-gluon plasma under the conditions expected in Pb-Pb collisions at the LHC. The change in width is predicted to be only about 1 MeV at a temperature of 1 GeV, compared to the natural width of 2490$\pm$7 MeV. The mass shift is even smaller. Hence no observable effects are to be expected. |
1111.4002 | Qiang Zhao | Xiao-Gang Wu and Qiang Zhao | The mixing of $D_{s1}(2460)$ and $D_{s1}(2536)$ | Revtex, 16 pages and 15 eps figures, Phys. Rev. D. in press | null | 10.1103/PhysRevD.85.034040 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mixing mechanism of axial-vectors $D_{s1}(2460)$ and $D_{s1}(2536)$ is
studied via intermediate hadron loops, e.g. $D^* K$, to which both states have
strong couplings. By constructing the two-state mixing propagator matrix that
respects the unitarity constraint and calculating the vertex coupling form
factors in a chiral quark model, we can extract the masses, widths and mixing
angles of the physical states. Two poles can be identified in the propagator
matrix. One is at $\sqrt{s}=2454.5 \ \textrm{MeV}$ corresponding to
$D_{s1}(2460)$ and the other at $\sqrt{s}=(2544.9-1.0i) \ \textrm{MeV}$
corresponding to $D_{s1}(2536)$. For $D_{s1}(2460)$, a large mixing angle
$\theta=47.5^\circ$ between ${}^3P_1$ and ${}^1P_1$ is obtained. It is driven
by the real part of the mixing matrix element and corresponds to
$\theta'=12.3^\circ$ between the $j=1/2$ and $j=3/2$ state mixing in the heavy
quark limit. For $D_{s1}(2536)$, a mixing angle $\theta=39.7^\circ$ which
corresponds to $\theta'=4.4^\circ$ in the heavy quark limit is found. An
additional phase angle $\phi=-6.9^\circ \sim 6.9^\circ$ is needed at the pole
mass of $D_{s1}(2536)$ since the mixing matrix elements are complex numbers.
Both the real and imaginary part are found important for the large mixing
angle. We show that the new experimental data from BaBar provide a strong
constraint on the mixing angle at the mass of $D_{s1}(2536)$, from which two
values can be extracted, i.e. $\theta_1=32.1^\circ$ or $\theta_2=38.4^\circ$.
Our study agrees well with the latter one. Detailed analysis of the mass shift
procedure due to the coupled channel effects is also presented.
| [
{
"created": "Thu, 17 Nov 2011 01:38:32 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Feb 2012 04:07:10 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Wu",
"Xiao-Gang",
""
],
[
"Zhao",
"Qiang",
""
]
] | The mixing mechanism of axial-vectors $D_{s1}(2460)$ and $D_{s1}(2536)$ is studied via intermediate hadron loops, e.g. $D^* K$, to which both states have strong couplings. By constructing the two-state mixing propagator matrix that respects the unitarity constraint and calculating the vertex coupling form factors in a chiral quark model, we can extract the masses, widths and mixing angles of the physical states. Two poles can be identified in the propagator matrix. One is at $\sqrt{s}=2454.5 \ \textrm{MeV}$ corresponding to $D_{s1}(2460)$ and the other at $\sqrt{s}=(2544.9-1.0i) \ \textrm{MeV}$ corresponding to $D_{s1}(2536)$. For $D_{s1}(2460)$, a large mixing angle $\theta=47.5^\circ$ between ${}^3P_1$ and ${}^1P_1$ is obtained. It is driven by the real part of the mixing matrix element and corresponds to $\theta'=12.3^\circ$ between the $j=1/2$ and $j=3/2$ state mixing in the heavy quark limit. For $D_{s1}(2536)$, a mixing angle $\theta=39.7^\circ$ which corresponds to $\theta'=4.4^\circ$ in the heavy quark limit is found. An additional phase angle $\phi=-6.9^\circ \sim 6.9^\circ$ is needed at the pole mass of $D_{s1}(2536)$ since the mixing matrix elements are complex numbers. Both the real and imaginary part are found important for the large mixing angle. We show that the new experimental data from BaBar provide a strong constraint on the mixing angle at the mass of $D_{s1}(2536)$, from which two values can be extracted, i.e. $\theta_1=32.1^\circ$ or $\theta_2=38.4^\circ$. Our study agrees well with the latter one. Detailed analysis of the mass shift procedure due to the coupled channel effects is also presented. |
2310.06519 | Majid Hashemi | Majid Hashemi, Laleh Roushandel | Charged Higgs decay to $W^{\pm}H$ at a high energy lepton collider | 12 pages, 24 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we present a search strategy for heavy charged Higgs boson at
Compact Linear Collider (CLIC) as a future $e^+e^-$ collider. The signal is
charged Higgs boson pair production in two Higgs doublet model (2HDM) followed
by $H^{\pm}\to W^{\pm}H$ and $H\to b\bar{b}$. Here, $H$ denotes the heavy
CP-even neutral Higgs boson of the model. The collider center of mass energy is
chosen to be $\sqrt{s}=1400$ GeV as the second stage of CLIC operation. In this
case, $m_{H^+}<\sqrt{s}/2$ can be explored due to the pair production. It is
shown that the signal of charged Higgs in the mass range 250 GeV $<m_{H^+}<$
650 GeV in fully hadronic final state, containing four $b$-jets from neutral
Higgs and four jets from $W$ bosons, can well be observed on top of the only
remaining standard model background, i.e., $t\bar{t}$. Finally, a measure of
data needed for discovery is expressed in terms of integrated luminosity for
$5\sigma$ at each theoretical hypothesis.
| [
{
"created": "Tue, 10 Oct 2023 11:02:16 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2023 07:17:17 GMT",
"version": "v2"
}
] | 2023-10-12 | [
[
"Hashemi",
"Majid",
""
],
[
"Roushandel",
"Laleh",
""
]
] | In this work, we present a search strategy for heavy charged Higgs boson at Compact Linear Collider (CLIC) as a future $e^+e^-$ collider. The signal is charged Higgs boson pair production in two Higgs doublet model (2HDM) followed by $H^{\pm}\to W^{\pm}H$ and $H\to b\bar{b}$. Here, $H$ denotes the heavy CP-even neutral Higgs boson of the model. The collider center of mass energy is chosen to be $\sqrt{s}=1400$ GeV as the second stage of CLIC operation. In this case, $m_{H^+}<\sqrt{s}/2$ can be explored due to the pair production. It is shown that the signal of charged Higgs in the mass range 250 GeV $<m_{H^+}<$ 650 GeV in fully hadronic final state, containing four $b$-jets from neutral Higgs and four jets from $W$ bosons, can well be observed on top of the only remaining standard model background, i.e., $t\bar{t}$. Finally, a measure of data needed for discovery is expressed in terms of integrated luminosity for $5\sigma$ at each theoretical hypothesis. |
1901.10030 | Kalliopi Petraki | Julia Harz and Kalliopi Petraki | Higgs-mediated bound states in dark-matter models | v2: 40 pages, 15 figures, 2 tables, published version | JHEP 1904 (2019) 130 | 10.1007/JHEP04(2019)130 | TUM-HEP-1186-19; Nikhef-2019-004 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently demonstrated that the 125 GeV Higgs boson can mediate a
long-range force between TeV-scale particles, that can impact considerably
their annihilation due to the Sommerfeld effect, and hence the density of
thermal relic dark matter. In the presence of long-range interactions, the
formation and decay of particle-antiparticle bound states can also deplete dark
matter significantly. We consider the Higgs boson as mediator in the formation
of bound states, and compute the effect on the dark matter abundance. To this
end, we consider a simplified model in which dark matter co-annihilates with
coloured particles that have a sizeable coupling to the Higgs. The
Higgs-mediated force affects the dark matter depletion via bound state
formation in several ways. It enhances the capture cross-sections due to the
attraction it mediates between the incoming particles, it increases the binding
energy of the bound states, hence rendering their ionisation inefficient sooner
in the early universe, and for large enough couplings, it can overcome the
gluon repulsion of certain colour representations and give rise to additional
bound states. Because it alters the momentum exchange in the bound states, the
Higgs-mediated force also affects the gluon-mediated potential via the running
of the strong coupling. We comment on the experimental implications and
conclude that the Higgs-mediated potential must be taken into account when
circumscribing the viable parameter space of related models.
| [
{
"created": "Mon, 28 Jan 2019 23:08:51 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2019 15:32:30 GMT",
"version": "v2"
}
] | 2019-04-22 | [
[
"Harz",
"Julia",
""
],
[
"Petraki",
"Kalliopi",
""
]
] | It has been recently demonstrated that the 125 GeV Higgs boson can mediate a long-range force between TeV-scale particles, that can impact considerably their annihilation due to the Sommerfeld effect, and hence the density of thermal relic dark matter. In the presence of long-range interactions, the formation and decay of particle-antiparticle bound states can also deplete dark matter significantly. We consider the Higgs boson as mediator in the formation of bound states, and compute the effect on the dark matter abundance. To this end, we consider a simplified model in which dark matter co-annihilates with coloured particles that have a sizeable coupling to the Higgs. The Higgs-mediated force affects the dark matter depletion via bound state formation in several ways. It enhances the capture cross-sections due to the attraction it mediates between the incoming particles, it increases the binding energy of the bound states, hence rendering their ionisation inefficient sooner in the early universe, and for large enough couplings, it can overcome the gluon repulsion of certain colour representations and give rise to additional bound states. Because it alters the momentum exchange in the bound states, the Higgs-mediated force also affects the gluon-mediated potential via the running of the strong coupling. We comment on the experimental implications and conclude that the Higgs-mediated potential must be taken into account when circumscribing the viable parameter space of related models. |
1505.01506 | Aleksandr Azatov | Aleksandr Azatov, Debtosh Chowdhury, Diptimoy Ghosh, Tirtha Sankar Ray | Same sign di-lepton candles of the composite gluons | 19 pages, to be published in JHEP | null | null | CERN-PH-TH-2015-10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Composite Higgs models, where the Higgs boson is identified with the
pseudo-Nambu-Goldstone-Boson (pNGB) of a strong sector, typically have light
composite fermions (top partners) to account for a light Higgs. This type of
models generically also predicts the existence of heavy vector fields
(composite gluons) which appear as an octet of QCD. These composite gluons
generically become very broad resonances once phase-space allows them to decay
into two composite fermions. This makes their traditional experimental
searches, which are designed to look for narrow resonances, quite ineffective.
In this paper we, as an alternative, propose to utilize the impact of composite
gluons on the production of top partners to constrain their parameter space. We
place constraints on the parameters of the composite resonances using the 8 TeV
LHC data and also assess the reach of the 14 TeV LHC. We find that the high
luminosity LHC will be able to probe composite gluon masses up to $\sim 6$ TeV,
even in the broad resonance regime.
| [
{
"created": "Wed, 6 May 2015 20:18:55 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Aug 2015 14:08:13 GMT",
"version": "v2"
}
] | 2015-09-01 | [
[
"Azatov",
"Aleksandr",
""
],
[
"Chowdhury",
"Debtosh",
""
],
[
"Ghosh",
"Diptimoy",
""
],
[
"Ray",
"Tirtha Sankar",
""
]
] | Composite Higgs models, where the Higgs boson is identified with the pseudo-Nambu-Goldstone-Boson (pNGB) of a strong sector, typically have light composite fermions (top partners) to account for a light Higgs. This type of models generically also predicts the existence of heavy vector fields (composite gluons) which appear as an octet of QCD. These composite gluons generically become very broad resonances once phase-space allows them to decay into two composite fermions. This makes their traditional experimental searches, which are designed to look for narrow resonances, quite ineffective. In this paper we, as an alternative, propose to utilize the impact of composite gluons on the production of top partners to constrain their parameter space. We place constraints on the parameters of the composite resonances using the 8 TeV LHC data and also assess the reach of the 14 TeV LHC. We find that the high luminosity LHC will be able to probe composite gluon masses up to $\sim 6$ TeV, even in the broad resonance regime. |
hep-ph/9309330 | Yoshio Koide | Yoshio Koide | Phenomenological Quark Mass Matrix Model with Two Adjustable Parameters | 12 pages (Latex) | Phys.Rev.D49:2638-2641,1994 | 10.1103/PhysRevD.49.2638 | null | hep-ph | null | A phenomenological quark mass matrix model which includes only two adjustable
parameters is proposed from the point of view of the unification of quark and
lepton mass matrices. The model can provide reasonable values of quark mass
ratios and Kobayashi-Maskawa matrix parameters.
| [
{
"created": "Tue, 28 Sep 1993 05:37:15 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Koide",
"Yoshio",
""
]
] | A phenomenological quark mass matrix model which includes only two adjustable parameters is proposed from the point of view of the unification of quark and lepton mass matrices. The model can provide reasonable values of quark mass ratios and Kobayashi-Maskawa matrix parameters. |
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