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2103.04798 | Adriano Lana Cherchiglia | A. L. Cherchiglia, G. De Conto, C. C. Nishi | Flavor constraints for a Vector-like quark of Nelson-Barr type | Appendices added | JHEP11 (2021) 093 | 10.1007/JHEP11(2021)093 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Nelson-Barr (NB) mechanism to solve the strong CP problem assumes CP
conservation, arranges vanishing $\bar{\theta}$ at tree-level and requires
vector-like quarks (VLQs) to transmit the CP breaking to the SM. We analyze the
flavor constraints coming from the presence of one such down type VLQ of NB
type by performing a global fit on the relevant flavor observables. A
comparison is made to the case of one generic VLQ. We find that the allowed
parameter space for the VLQ Yukawa couplings and the mixing to the SM are
confined to a region much smaller than in the generic case, making the NB case
falsifiable in principle.
| [
{
"created": "Mon, 8 Mar 2021 14:47:56 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 16:32:23 GMT",
"version": "v2"
}
] | 2021-11-19 | [
[
"Cherchiglia",
"A. L.",
""
],
[
"De Conto",
"G.",
""
],
[
"Nishi",
"C. C.",
""
]
] | The Nelson-Barr (NB) mechanism to solve the strong CP problem assumes CP conservation, arranges vanishing $\bar{\theta}$ at tree-level and requires vector-like quarks (VLQs) to transmit the CP breaking to the SM. We analyze the flavor constraints coming from the presence of one such down type VLQ of NB type by performing a global fit on the relevant flavor observables. A comparison is made to the case of one generic VLQ. We find that the allowed parameter space for the VLQ Yukawa couplings and the mixing to the SM are confined to a region much smaller than in the generic case, making the NB case falsifiable in principle. |
hep-ph/9505216 | Marina Nielsen | G. Krein, D.P. Menezes, M. Nielsen and M.B. Pinto | Studying medium effects with the optimized $\bdelta$ expansion | 24 pages in revtex, 9 figures (not included) available as ps files
upon request | null | null | IFUSP/P-1151 | hep-ph nucl-th | null | The possibility of using the optimized $\delta$ expansion for studying medium
effects on hadronic properties in quark or nuclear matter is investigated. The
$\delta$ expansion is employed to study density effects with two commonly used
models in hadron and nuclear physics, the Nambu--Jona-Lasinio model for the
dynamical chiral symmetry breaking and the Walecka model for the equation of
state of nuclear matter. The results obtained with the $\delta$ expansion are
compared to those obtained with the traditional Hartree-Fock approximation.
Perspectives for using the $\delta$ expansion in other field theoretic models
in hadron and nuclear physics are discussed.
| [
{
"created": "Tue, 2 May 1995 16:18:50 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Krein",
"G.",
""
],
[
"Menezes",
"D. P.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Pinto",
"M. B.",
""
]
] | The possibility of using the optimized $\delta$ expansion for studying medium effects on hadronic properties in quark or nuclear matter is investigated. The $\delta$ expansion is employed to study density effects with two commonly used models in hadron and nuclear physics, the Nambu--Jona-Lasinio model for the dynamical chiral symmetry breaking and the Walecka model for the equation of state of nuclear matter. The results obtained with the $\delta$ expansion are compared to those obtained with the traditional Hartree-Fock approximation. Perspectives for using the $\delta$ expansion in other field theoretic models in hadron and nuclear physics are discussed. |
0901.3387 | Thomas A. Trainor | Thomas A. Trainor | Evolution of minimum-bias parton fragmentation in nuclear collisions | 20 pages, 18 figures | Phys.Rev.C80:044901,2009 | 10.1103/PhysRevC.80.044901 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Minimum-bias fragment distributions (FDs) are calculated by folding a
power-law parton energy spectrum with parametrized fragmentation functions
(FFs) derived from $e^+$-$e^-$ and p-\=p collisions. Changes in FFs due to
parton "energy loss" or "medium modification" are modeled by altering FF
parametrizations consistent with rescaling QCD splitting functions. The common
parton spectrum is constrained by comparison with a p-p $p_t$ spectrum hard
component. In-vacuum and in-medium FDs are compared with spectrum hard
components from 200 GeV Au-Au collisions for several centralities. The
reference for all nuclear collisions is the FD derived from in-vacuum
$e^+$-$e^-$ FFs. The hard component for p-p and peripheral Au-Au collisions is
found to be {\em strongly suppressed} for smaller fragment momenta, consistent
with the FD derived from in-vacuum p-\=p FFs. At a particular centrality the
Au-Au hard component transitions to enhancement at smaller momenta and
suppression at larger momenta, consistent with FDs derived from in-medium
$e^+$-$e^-$ FFs. Fragmentation systematics suggest that QCD color connections
change dramatically in more-central A-A collisions. Spectrum systematics are
inconsistent with saturation-scale arguments and parton thermalization.
| [
{
"created": "Thu, 22 Jan 2009 01:35:00 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2009 00:02:34 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"Trainor",
"Thomas A.",
""
]
] | Minimum-bias fragment distributions (FDs) are calculated by folding a power-law parton energy spectrum with parametrized fragmentation functions (FFs) derived from $e^+$-$e^-$ and p-\=p collisions. Changes in FFs due to parton "energy loss" or "medium modification" are modeled by altering FF parametrizations consistent with rescaling QCD splitting functions. The common parton spectrum is constrained by comparison with a p-p $p_t$ spectrum hard component. In-vacuum and in-medium FDs are compared with spectrum hard components from 200 GeV Au-Au collisions for several centralities. The reference for all nuclear collisions is the FD derived from in-vacuum $e^+$-$e^-$ FFs. The hard component for p-p and peripheral Au-Au collisions is found to be {\em strongly suppressed} for smaller fragment momenta, consistent with the FD derived from in-vacuum p-\=p FFs. At a particular centrality the Au-Au hard component transitions to enhancement at smaller momenta and suppression at larger momenta, consistent with FDs derived from in-medium $e^+$-$e^-$ FFs. Fragmentation systematics suggest that QCD color connections change dramatically in more-central A-A collisions. Spectrum systematics are inconsistent with saturation-scale arguments and parton thermalization. |
hep-ph/0509266 | Gilberto Colangelo | Irinel Caprini, Gilberto Colangelo and Heinrich Leutwyler | Theoretical Aspects of the Pion-Pion Interaction | 4 pages, talk presented by I. Caprini at the International Conference
on QCD and Hadronic Physics, June 16-20 2005, Beijing | Int.J.Mod.Phys.A21:954-957,2006 | 10.1142/S0217751X0603240X | null | hep-ph | null | We give a brief review of the theoretical description of low energy pion-pion
scattering by the combined use of Chiral Perturbation Theory and Roy equations,
an update of the Regge parametrization of $\pi\pi$ cross sections at high
energies, and a short discussion of the scalar radius of the pion.
| [
{
"created": "Fri, 23 Sep 2005 16:04:52 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Caprini",
"Irinel",
""
],
[
"Colangelo",
"Gilberto",
""
],
[
"Leutwyler",
"Heinrich",
""
]
] | We give a brief review of the theoretical description of low energy pion-pion scattering by the combined use of Chiral Perturbation Theory and Roy equations, an update of the Regge parametrization of $\pi\pi$ cross sections at high energies, and a short discussion of the scalar radius of the pion. |
2005.14465 | Ziyue Wang | Ziyue Wang, Shuzhe Shi, and Pengfei Zhuang | Chiral Phase Transition in an Expanding Quark System | 14 pages, 8 figures | Phys. Rev. C 103, 014901 (2021) | 10.1103/PhysRevC.103.014901 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of chiral symmetry which varies along the
space-time evolution of the system by considering the chiral phase transition
in an non-equilibrium expanding quark-antiquark system. The chiral symmetry is
described by the mean field order parameter, whose values is the solution of a
self-consistent equation, and affects the space-time evolution of the system
through the force term in the Vlasov equation. The Vlasov equation and the gap
equation are solved concurrently and continuously for a longitudinal
boost-invariant and transversely rotation-invariant system. This numerical
framework enables us to carefully investigate how the phase transition and
collision affect the evolution of the system. It is observed that the chiral
phase transition gives rise to a kink in the flow velocity, which is caused by
the force term in the Vlasov equation. The kink is enhanced by larger
susceptibility and tends to be smoothed out by non-equilibrium effect. The
spatial phase boundary appears as a "wall" for the quarks, as the quarks with
low momentum are bounced back, while those with high momentum go through the
wall but are slowed down.
| [
{
"created": "Fri, 29 May 2020 09:26:37 GMT",
"version": "v1"
}
] | 2021-01-13 | [
[
"Wang",
"Ziyue",
""
],
[
"Shi",
"Shuzhe",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | We investigate the influence of chiral symmetry which varies along the space-time evolution of the system by considering the chiral phase transition in an non-equilibrium expanding quark-antiquark system. The chiral symmetry is described by the mean field order parameter, whose values is the solution of a self-consistent equation, and affects the space-time evolution of the system through the force term in the Vlasov equation. The Vlasov equation and the gap equation are solved concurrently and continuously for a longitudinal boost-invariant and transversely rotation-invariant system. This numerical framework enables us to carefully investigate how the phase transition and collision affect the evolution of the system. It is observed that the chiral phase transition gives rise to a kink in the flow velocity, which is caused by the force term in the Vlasov equation. The kink is enhanced by larger susceptibility and tends to be smoothed out by non-equilibrium effect. The spatial phase boundary appears as a "wall" for the quarks, as the quarks with low momentum are bounced back, while those with high momentum go through the wall but are slowed down. |
1712.00051 | Mohammad R. Ahmady | Mohammad Ahmady, Farrukh Chishtie and Ruben Sandapen | The pion holographic wavefunction with dynamical spin effects | 6 pages, 1 figure, to appear in the proceedings of the XVII
International Conference on Hadron Spectroscopy and Structure (Hadron 2017),
September 25th-29th 2017 Salamanca, Spain | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report that the inclusion of dynamical spin effects in the pion
holographic light-front wavefunction leads to a remarkable improvement in
describing pion observables (pion mean charge radius, decay constant, spacelike
electromagnetic form factor) without the need to invoke higher Fock state
contributions and/or a special AdS/QCD mass scale for the pion.
| [
{
"created": "Thu, 30 Nov 2017 19:49:07 GMT",
"version": "v1"
}
] | 2017-12-04 | [
[
"Ahmady",
"Mohammad",
""
],
[
"Chishtie",
"Farrukh",
""
],
[
"Sandapen",
"Ruben",
""
]
] | We report that the inclusion of dynamical spin effects in the pion holographic light-front wavefunction leads to a remarkable improvement in describing pion observables (pion mean charge radius, decay constant, spacelike electromagnetic form factor) without the need to invoke higher Fock state contributions and/or a special AdS/QCD mass scale for the pion. |
hep-ph/0606252 | Robert Kaminski | Yu. S. Surovtsev, R. Kaminski, D. Krupa, M. Nagy | On nature of scalar and tensor mesons from the analysis of processes
pi-pi-> pi-pi, K-Kbar, eta-eta | 22 pages, talk given at the International Conference "New Trends in
High Energy Physics", September 10 - 17, Yalta, Crimea, Ukraine | null | 10.1007/978-1-4020-4965-1_14 | null | hep-ph | null | Analysis of the isoscalar S- and D-waves of processes pi-pi-> pi-pi, K-Kbar,
eta-eta is carried out aimed at studying the status and QCD nature of scalar
and tensor mesons below 2 GeV and 2.3 GeV, respectively. Assignment of these
mesons to lower scalar and tensor nonets is proposed.
| [
{
"created": "Fri, 23 Jun 2006 14:05:05 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Surovtsev",
"Yu. S.",
""
],
[
"Kaminski",
"R.",
""
],
[
"Krupa",
"D.",
""
],
[
"Nagy",
"M.",
""
]
] | Analysis of the isoscalar S- and D-waves of processes pi-pi-> pi-pi, K-Kbar, eta-eta is carried out aimed at studying the status and QCD nature of scalar and tensor mesons below 2 GeV and 2.3 GeV, respectively. Assignment of these mesons to lower scalar and tensor nonets is proposed. |
hep-ph/0005193 | Antonio Soares de Castro | W. S. Carvalho, A. S. de Castro, A. C. B. Antunes | Absence of Gluonic Components in Axial and Tensor Mesons | 12 pages | Eur.Phys.J.C17:173-177,2000 | 10.1007/s100520000444 | null | hep-ph | null | A quarkonium-gluonium mixing scheme previously developed to describe the
characteristic of the pseudoscalar mesons is applied to axial and tensor
mesons. The parameters of the model are determined by fitting the eigenvalues
of a mass matrix. The corresponding eigenvectors give the proportion of light
quarks, strange quarks and glueball in each meson. However the predictions of
the model for branching ratios and electromagnetic decays are incompatible with
the experimental results. These results suggest the absence of gluonic
components in the states of axial and tensor isosinglet mesons analyzed here.
| [
{
"created": "Thu, 18 May 2000 17:23:12 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Carvalho",
"W. S.",
""
],
[
"de Castro",
"A. S.",
""
],
[
"Antunes",
"A. C. B.",
""
]
] | A quarkonium-gluonium mixing scheme previously developed to describe the characteristic of the pseudoscalar mesons is applied to axial and tensor mesons. The parameters of the model are determined by fitting the eigenvalues of a mass matrix. The corresponding eigenvectors give the proportion of light quarks, strange quarks and glueball in each meson. However the predictions of the model for branching ratios and electromagnetic decays are incompatible with the experimental results. These results suggest the absence of gluonic components in the states of axial and tensor isosinglet mesons analyzed here. |
hep-ph/0604051 | Boris A. Arbuzov | Boris A. Arbuzov, Mikhail K. Volkov, Ivan V. Zaitsev | NJL model derived from QCD | 19 pages, 2 figures | Int.J.Mod.Phys. A21 (2006) 5721-5742 | 10.1142/S0217751X06033830 | null | hep-ph | null | We apply Bogolubov approach to QCD with two light quarks to demonstrate a
spontaneous generation of an effective interaction, leading to the Nambu --
Jona-Lasinio model. The resulting theory contains two parameters: average
low-energy value of $\alpha_s$ and current light quark mass $m_0$. All other
low-energy parameters: the pion decay constant, mass of the $\pi$-meson, mass
of the $\sigma$-meson and its width, the constituent quark mass, the quark
condensate are expressed in terms of the two input parameters in satisfactory
correspondence to experimental data and chiral phenomenology. {\it E.g.} in the
approximation being used we have for $\alpha_s = 0.67$ and $m_0 = 20 MeV$:
$f_\pi = 93 MeV, m_\pi = 135 MeV, m_\sigma = 492 MeV, \Gamma_\sigma = 574 MeV,
m_q = 295 MeV, <\bar q q> = -(222 MeV)^3$.
| [
{
"created": "Thu, 6 Apr 2006 09:19:48 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Arbuzov",
"Boris A.",
""
],
[
"Volkov",
"Mikhail K.",
""
],
[
"Zaitsev",
"Ivan V.",
""
]
] | We apply Bogolubov approach to QCD with two light quarks to demonstrate a spontaneous generation of an effective interaction, leading to the Nambu -- Jona-Lasinio model. The resulting theory contains two parameters: average low-energy value of $\alpha_s$ and current light quark mass $m_0$. All other low-energy parameters: the pion decay constant, mass of the $\pi$-meson, mass of the $\sigma$-meson and its width, the constituent quark mass, the quark condensate are expressed in terms of the two input parameters in satisfactory correspondence to experimental data and chiral phenomenology. {\it E.g.} in the approximation being used we have for $\alpha_s = 0.67$ and $m_0 = 20 MeV$: $f_\pi = 93 MeV, m_\pi = 135 MeV, m_\sigma = 492 MeV, \Gamma_\sigma = 574 MeV, m_q = 295 MeV, <\bar q q> = -(222 MeV)^3$. |
1010.2978 | Yun Guo | M.E. Carrington and Yun Guo | Techniques for n-Particle Irreducible Effective Theories | 43 pages, 48 figures, add a paragraph in conclusions, Figs. 25,45,46
changed, typos corrected, final version to appear in PRD | Phys.Rev.D83:016006,2011 | 10.1103/PhysRevD.83.016006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show that the skeleton diagrams in the m-Loop nPI effective
action correspond to an infinite resummation of perturbative diagrams which is
void of double counting at the m-Loop level. We also show that the variational
equations of motion produced by the n-Loop nPI effective theory are equivalent
to the Schwinger-Dyson equations, up to the order at which they are consistent
with the underlying symmetries of the original theory. We use a diagrammatic
technique to obtain the 5-Loop 5PI effective action for a scalar theory with
cubic and quartic interactions, and verify that the result satisfies these two
statements.
| [
{
"created": "Thu, 14 Oct 2010 16:57:49 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jan 2011 19:44:40 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Carrington",
"M. E.",
""
],
[
"Guo",
"Yun",
""
]
] | In this paper we show that the skeleton diagrams in the m-Loop nPI effective action correspond to an infinite resummation of perturbative diagrams which is void of double counting at the m-Loop level. We also show that the variational equations of motion produced by the n-Loop nPI effective theory are equivalent to the Schwinger-Dyson equations, up to the order at which they are consistent with the underlying symmetries of the original theory. We use a diagrammatic technique to obtain the 5-Loop 5PI effective action for a scalar theory with cubic and quartic interactions, and verify that the result satisfies these two statements. |
hep-ph/0607263 | Ernesto Arganda | S. Antusch, E. Arganda, M.J. Herrero, A. M. Teixeira | Impact of $\theta_{13}$ on Lepton Flavour Violating processes within
SUSY Seesaw | 44 pages, 25 figures. Some comments and references added. Version to
appear in JHEP | JHEP 0611 (2006) 090 | 10.1088/1126-6708/2006/11/090 | FTUAM 06/11, IFT-UAM/CSIC-06-35 | hep-ph | null | We study the impact of neutrino masses and mixings on LFV processes within
the context of the supersymmetric seesaw scenario, where the CMSSM is extended
by three right-handed (s)neutrinos. A hierarchical spectrum is considered for
both heavy and light neutrinos. We systematically analyse the interesting
relation between the leptonic mixing angle $\theta_{13}$ and LFV muon and tau
decays, namely $l_j \to l_i \gamma$ and $l_j \to 3 l_i$, and discuss the
interplay with the other relevant parameters. We require compatibility with low
energy neutrino data, bounds on both LFV decays and charged lepton electric
dipole moments, and impose a successful baryogenesis via thermal leptogenesis.
Particular emphasis is given to the implications that a future $\theta_{13}$
measurement can have on our knowledge of the heavy neutrino sector.
| [
{
"created": "Mon, 24 Jul 2006 15:00:37 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Nov 2006 09:40:17 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Antusch",
"S.",
""
],
[
"Arganda",
"E.",
""
],
[
"Herrero",
"M. J.",
""
],
[
"Teixeira",
"A. M.",
""
]
] | We study the impact of neutrino masses and mixings on LFV processes within the context of the supersymmetric seesaw scenario, where the CMSSM is extended by three right-handed (s)neutrinos. A hierarchical spectrum is considered for both heavy and light neutrinos. We systematically analyse the interesting relation between the leptonic mixing angle $\theta_{13}$ and LFV muon and tau decays, namely $l_j \to l_i \gamma$ and $l_j \to 3 l_i$, and discuss the interplay with the other relevant parameters. We require compatibility with low energy neutrino data, bounds on both LFV decays and charged lepton electric dipole moments, and impose a successful baryogenesis via thermal leptogenesis. Particular emphasis is given to the implications that a future $\theta_{13}$ measurement can have on our knowledge of the heavy neutrino sector. |
hep-ph/0107082 | Masataka Fukugita | M. Fukugita and M. Tanimoto | Lepton Flavour Mixing Matrix and CP Violation from Neutrino Oscillation
Experiments | 8 pages LaTeX file. Accepted for publication in Phys. Lett. B | Phys.Lett.B515:30-32,2001 | 10.1016/S0370-2693(01)00870-X | null | hep-ph | null | The measurement of the charged-current 8B solar neutrino reaction on
deuterium at the Sudbury Neutrino Observatory confirms the neutrino oscillation
hypothesis for the solar neutrino problem, and the result favours the solution
with large neutrino mixing angles. We demonstrate that the current neutrino
oscillation data (including atmospheric and reactor neutrinos) are sufficient
to construct the lepton flavour mixing matrix with a reasonable accuracy. We
also infer the maximum size of CP violation effects consistent with the current
neutrino oscillation experiments.
| [
{
"created": "Mon, 9 Jul 2001 05:20:54 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Fukugita",
"M.",
""
],
[
"Tanimoto",
"M.",
""
]
] | The measurement of the charged-current 8B solar neutrino reaction on deuterium at the Sudbury Neutrino Observatory confirms the neutrino oscillation hypothesis for the solar neutrino problem, and the result favours the solution with large neutrino mixing angles. We demonstrate that the current neutrino oscillation data (including atmospheric and reactor neutrinos) are sufficient to construct the lepton flavour mixing matrix with a reasonable accuracy. We also infer the maximum size of CP violation effects consistent with the current neutrino oscillation experiments. |
1410.5806 | Dorival Goncalves | Malte Buschmann, Dorival Goncalves, Silvan Kuttimalai, Marek
Schonherr, Frank Krauss, Tilman Plehn | Mass Effects in the Higgs-Gluon Coupling: Boosted vs Off-Shell
Production | 15 pages, 11 figures | null | 10.1007/JHEP02(2015)038 | IPPP/14/93; DCPT/14/186 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the upcoming LHC run we will be able to probe the structure ofthe
loop--induced Higgs--gluon coupling through kinematics. First, we establish
state-of-the-art simulations with up to two jets to next-to-leading order
including top mass effects. They allow us to search for deviations from the
low-energy limits in boosted Higgs production. In addition, the size of the top
mass effects suggests that they should generally be included in Higgs studies
at the LHC. Next, we show how off-shell Higgs production with a decay to four
leptons is sensitive to the same top mass effects. We compare the potential of
both methods based on the same top--Higgs Lagrangian. Finally, we comment on
related model assumptions required for a Higgs width measurement.
| [
{
"created": "Tue, 21 Oct 2014 19:59:27 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Buschmann",
"Malte",
""
],
[
"Goncalves",
"Dorival",
""
],
[
"Kuttimalai",
"Silvan",
""
],
[
"Schonherr",
"Marek",
""
],
[
"Krauss",
"Frank",
""
],
[
"Plehn",
"Tilman",
""
]
] | In the upcoming LHC run we will be able to probe the structure ofthe loop--induced Higgs--gluon coupling through kinematics. First, we establish state-of-the-art simulations with up to two jets to next-to-leading order including top mass effects. They allow us to search for deviations from the low-energy limits in boosted Higgs production. In addition, the size of the top mass effects suggests that they should generally be included in Higgs studies at the LHC. Next, we show how off-shell Higgs production with a decay to four leptons is sensitive to the same top mass effects. We compare the potential of both methods based on the same top--Higgs Lagrangian. Finally, we comment on related model assumptions required for a Higgs width measurement. |
1902.04476 | Daniel R. Tovey | Daniel R. Tovey | Transformation properties of the transverse mass under transverse
Lorentz boosts at hadron colliders | 7 pages double column, 7 figures, formatted for EPJC | null | 10.1140/epjc/s10052-019-6813-5 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The transverse mass of semi-invisibly decaying particles, calculated from the
transverse momenta of their decay products, has been used in a broad range of
searches and measurements at hadron colliders, such as the LHC. This variable
is invariant by construction under Lorentz boosts purely in the longitudinal
(beam) direction, thereby minimising sensitivity to fluctuations in the
fractions of the proton momentum carried by the colliding partons. In this
paper we examine, by contrast, the properties of the transverse mass under
boosts with a component also in the transverse plane perpendicular to the beam
direction. We show that this variable is invariant under such boosts in cases
where the boost is purely transverse and (a) the momenta of the decay products
are confined to the transverse plane in the rest frame of the parent particle
and/or (b) the transverse momenta of the decay products are perpendicular to
the boost direction. We discuss the transformation properties of the transverse
mass in the case of combined transverse and longitudinal boosts and identify
the criteria under which the transverse mass in the laboratory frame can equal
the rest mass of the parent particle, irrespective of its value in the rest
frame of the parent.
| [
{
"created": "Tue, 12 Feb 2019 16:26:27 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2019 08:10:19 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Mar 2019 19:05:23 GMT",
"version": "v3"
}
] | 2019-05-01 | [
[
"Tovey",
"Daniel R.",
""
]
] | The transverse mass of semi-invisibly decaying particles, calculated from the transverse momenta of their decay products, has been used in a broad range of searches and measurements at hadron colliders, such as the LHC. This variable is invariant by construction under Lorentz boosts purely in the longitudinal (beam) direction, thereby minimising sensitivity to fluctuations in the fractions of the proton momentum carried by the colliding partons. In this paper we examine, by contrast, the properties of the transverse mass under boosts with a component also in the transverse plane perpendicular to the beam direction. We show that this variable is invariant under such boosts in cases where the boost is purely transverse and (a) the momenta of the decay products are confined to the transverse plane in the rest frame of the parent particle and/or (b) the transverse momenta of the decay products are perpendicular to the boost direction. We discuss the transformation properties of the transverse mass in the case of combined transverse and longitudinal boosts and identify the criteria under which the transverse mass in the laboratory frame can equal the rest mass of the parent particle, irrespective of its value in the rest frame of the parent. |
1308.4146 | Matthew Buckley | Matthew R. Buckley | Using Effective Operators to Understand CoGeNT and CDMS-Silicon | 15 pages, 2 tables, 4 figures | Phys. Rev. D 88, 055028 (2013) | 10.1103/PhysRevD.88.055028 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several direct detection experiments have reported positive signals
consistent with a dark matter particle with a mass of approximately 7-9 GeV and
a spin independent scattering cross section of 2.5-4.8 x 10^-41 cm^2. These
results do not rise to the level of discovery, but assuming that they are due
to dark matter, some questions about the underlying physics can already be
addressed. In this paper, I apply the effective operator formalism for dark
matter-Standard Model interactions to the results of the CoGeNT and CDMS
silicon target experiments. I demonstrate that only one set of flavor-blind
effective operators between dark matter can quarks can be consistent with the
reported results in all energy regimes of interest, namely thermal freeze-out,
nuclear scattering, indirect detection, and TeV-scale colliders. This set of
operators implies large couplings of dark matter with heavy quarks. The
alternative implies either that the new physics has non-trivial flavor
structure, that the effective formalism is not applicable and so contains new
states in the spectrum accessible at the LHC, or has large annihilation
channels (possibly via effective operators) into non-colored Standard Model
particles.
| [
{
"created": "Mon, 19 Aug 2013 20:00:06 GMT",
"version": "v1"
}
] | 2013-10-30 | [
[
"Buckley",
"Matthew R.",
""
]
] | Several direct detection experiments have reported positive signals consistent with a dark matter particle with a mass of approximately 7-9 GeV and a spin independent scattering cross section of 2.5-4.8 x 10^-41 cm^2. These results do not rise to the level of discovery, but assuming that they are due to dark matter, some questions about the underlying physics can already be addressed. In this paper, I apply the effective operator formalism for dark matter-Standard Model interactions to the results of the CoGeNT and CDMS silicon target experiments. I demonstrate that only one set of flavor-blind effective operators between dark matter can quarks can be consistent with the reported results in all energy regimes of interest, namely thermal freeze-out, nuclear scattering, indirect detection, and TeV-scale colliders. This set of operators implies large couplings of dark matter with heavy quarks. The alternative implies either that the new physics has non-trivial flavor structure, that the effective formalism is not applicable and so contains new states in the spectrum accessible at the LHC, or has large annihilation channels (possibly via effective operators) into non-colored Standard Model particles. |
1509.06998 | Guruprasad Kadam Mr. | Guru Prakash Kadam and Hiranmaya Mishra | Medium modification of hadron masses and the thermodynamics of hadron
resonance gas model | 9 pages, 8 figures | Phys. Rev. C 93, 025205 (2016) | 10.1103/PhysRevC.93.025205 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of temperature (T) and baryon density ({\mu}) dependent
hadron masses on the thermodynamics of hadronic matter. We use linear scaling
rule in terms of constituent quark masses for all hadrons except for light
mesons. T and {\mu} dependent constituent quark masses and the light mesons
masses are computed using 2+1 flavor Nambu-Jona-Lasinio (NJL) model. We compute
the thermodynamical quantities of hadronic matter within excluded volume hadron
resonance gas model (EHRG) with these T and {\mu} dependent hadron masses. We
confront the thermodynamical quantities with the lattice quantum chromodynamics
(LQCD) at {\mu} = 0 GeV. Further, we comment on the effect of T and {\mu}
dependent hadron masses on the transport properties near the transition
temperature.
| [
{
"created": "Wed, 23 Sep 2015 14:16:14 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Feb 2016 05:15:16 GMT",
"version": "v2"
}
] | 2016-02-24 | [
[
"Kadam",
"Guru Prakash",
""
],
[
"Mishra",
"Hiranmaya",
""
]
] | We study the effect of temperature (T) and baryon density ({\mu}) dependent hadron masses on the thermodynamics of hadronic matter. We use linear scaling rule in terms of constituent quark masses for all hadrons except for light mesons. T and {\mu} dependent constituent quark masses and the light mesons masses are computed using 2+1 flavor Nambu-Jona-Lasinio (NJL) model. We compute the thermodynamical quantities of hadronic matter within excluded volume hadron resonance gas model (EHRG) with these T and {\mu} dependent hadron masses. We confront the thermodynamical quantities with the lattice quantum chromodynamics (LQCD) at {\mu} = 0 GeV. Further, we comment on the effect of T and {\mu} dependent hadron masses on the transport properties near the transition temperature. |
2103.14270 | Mikko Laine | M. Laine | 1-loop matching of a thermal Lorentz force | 21 pages. v2: clarifications added | JHEP 06 (2021) 139 | 10.1007/JHEP06(2021)139 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studying the diffusion and kinetic equilibration of heavy quarks within a hot
QCD medium profits from the knowledge of a coloured Lorentz force that acts on
them. Starting from the spatial components of the vector current, and carrying
out two matching computations, one for the heavy quark mass scale ($M$) and
another for thermal scales ($\sqrt{MT}$, $T$), we determine 1-loop matching
coefficients for the electric and magnetic parts of a Lorentz force. The
magnetic part has a non-zero anomalous dimension, which agrees with that
extracted from two other considerations, one thermal and the other in vacuum.
The matching coefficient could enable a lattice study of a colour-magnetic
2-point correlator.
| [
{
"created": "Fri, 26 Mar 2021 05:42:35 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2021 06:40:32 GMT",
"version": "v2"
}
] | 2021-06-25 | [
[
"Laine",
"M.",
""
]
] | Studying the diffusion and kinetic equilibration of heavy quarks within a hot QCD medium profits from the knowledge of a coloured Lorentz force that acts on them. Starting from the spatial components of the vector current, and carrying out two matching computations, one for the heavy quark mass scale ($M$) and another for thermal scales ($\sqrt{MT}$, $T$), we determine 1-loop matching coefficients for the electric and magnetic parts of a Lorentz force. The magnetic part has a non-zero anomalous dimension, which agrees with that extracted from two other considerations, one thermal and the other in vacuum. The matching coefficient could enable a lattice study of a colour-magnetic 2-point correlator. |
2312.10292 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the vector hidden-charm-hidden-strange tetraquark states
with implicit P-waves | 15 pages, 4 figures | Nucl. Phys. B1002 (2024) 116514 | 10.1016/j.nuclphysb.2024.116514 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We take the scalar, pseudoscalar, axialvector, vector and tensor diquarks as
the basic building blocks to construct the four-quark currents with implicit
P-waves, and investigate the hidden-charm-hidden-strange tetraquark states with
the $J^{PC}=1^{--}$ and $1^{-+}$ via the QCD sum rules in a comprehensive and
consistent way, and revisit the assignments of the $X/Y$ states, especially the
$Y(4500)$, $X(4630)$, $Y(4660)$, $Y(4710)$ and $Y(4790)$, in the tetraquark
picture.
| [
{
"created": "Sat, 16 Dec 2023 02:25:24 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2024 01:44:35 GMT",
"version": "v2"
}
] | 2024-04-01 | [
[
"Wang",
"Zhi-Gang",
""
]
] | We take the scalar, pseudoscalar, axialvector, vector and tensor diquarks as the basic building blocks to construct the four-quark currents with implicit P-waves, and investigate the hidden-charm-hidden-strange tetraquark states with the $J^{PC}=1^{--}$ and $1^{-+}$ via the QCD sum rules in a comprehensive and consistent way, and revisit the assignments of the $X/Y$ states, especially the $Y(4500)$, $X(4630)$, $Y(4660)$, $Y(4710)$ and $Y(4790)$, in the tetraquark picture. |
1202.1292 | Hai-Yang Cheng | Hai-Yang Cheng, Cheng-Wei Chiang | Revisiting Scalar and Pseudoscalar Couplings with Nucleons | 17 pages, Sec. II is revised and the pion-nucleon sigma term
extracted from the scattering data is discussed. Version to appear in JHEP | null | 10.1007/JHEP07(2012)009 | null | hep-ph astro-ph.CO hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Certain dark matter interactions with nuclei are mediated possibly by a
scalar or pseudoscalar Higgs boson. The estimation of the corresponding cross
sections requires a correct evaluation of the couplings between the scalar or
pseudoscalar Higgs boson and the nucleons. Progress has been made in two
aspects relevant to this study in the past few years. First, recent lattice
calculations show that the strange-quark sigma term $\sigma_s$ and the
strange-quark content in the nucleon are much smaller than what are expected
previously. Second, lattice and model analyses imply sizable SU(3) breaking
effects in the determination on the axial-vector coupling constant $g_A^8$ that
in turn affect the extraction of the isosinglet coupling $g_A^0$ and the
strange quark spin component $\Delta s$ from polarized deep inelastic
scattering experiments. Based on these new developments, we re-evaluate the
relevant nucleon matrix elements and compute the scalar and pseudoscalar
couplings of the proton and neutron. We also find that the strange quark
contribution in both types of couplings is smaller than previously thought.
| [
{
"created": "Mon, 6 Feb 2012 21:07:47 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2012 02:33:46 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Chiang",
"Cheng-Wei",
""
]
] | Certain dark matter interactions with nuclei are mediated possibly by a scalar or pseudoscalar Higgs boson. The estimation of the corresponding cross sections requires a correct evaluation of the couplings between the scalar or pseudoscalar Higgs boson and the nucleons. Progress has been made in two aspects relevant to this study in the past few years. First, recent lattice calculations show that the strange-quark sigma term $\sigma_s$ and the strange-quark content in the nucleon are much smaller than what are expected previously. Second, lattice and model analyses imply sizable SU(3) breaking effects in the determination on the axial-vector coupling constant $g_A^8$ that in turn affect the extraction of the isosinglet coupling $g_A^0$ and the strange quark spin component $\Delta s$ from polarized deep inelastic scattering experiments. Based on these new developments, we re-evaluate the relevant nucleon matrix elements and compute the scalar and pseudoscalar couplings of the proton and neutron. We also find that the strange quark contribution in both types of couplings is smaller than previously thought. |
1508.06524 | Andreas Papaefstathiou | Andreas Papaefstathiou and Kazuki Sakurai | Triple Higgs boson production at a 100 TeV proton-proton collider | Corrected version of Figure 6 | null | 10.1007/JHEP02(2016)006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider triple Higgs boson production at a future 100 TeV proton-proton
collider. We perform a survey of viable final states and compare and contrast
triple production to Higgs boson pair production. Focussing on the $hhh
\rightarrow (b\bar{b}) (b\bar{b}) (\gamma \gamma)$ final state, we construct a
baseline analysis for the Standard Model scenario and simple deformations,
demonstrating that the process merits investigation in the high-luminosity
phase of the future collider as a new probe of the self-coupling sector of the
Higgs boson.
| [
{
"created": "Wed, 26 Aug 2015 15:07:11 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 2016 08:28:18 GMT",
"version": "v2"
},
{
"created": "Thu, 23 May 2019 15:00:59 GMT",
"version": "v3"
}
] | 2019-05-24 | [
[
"Papaefstathiou",
"Andreas",
""
],
[
"Sakurai",
"Kazuki",
""
]
] | We consider triple Higgs boson production at a future 100 TeV proton-proton collider. We perform a survey of viable final states and compare and contrast triple production to Higgs boson pair production. Focussing on the $hhh \rightarrow (b\bar{b}) (b\bar{b}) (\gamma \gamma)$ final state, we construct a baseline analysis for the Standard Model scenario and simple deformations, demonstrating that the process merits investigation in the high-luminosity phase of the future collider as a new probe of the self-coupling sector of the Higgs boson. |
hep-ph/9602256 | null | M.B. Voloshin | Second order QCD corrections to the nonleptonic decay of the $b$ quark
in the slow charm limit | 11 pages, 4 figures, all in standard LaTeX | Int.J.Mod.Phys.A11:4931-4942,1996 | 10.1142/S0217751X96002261 | TPI-MINN-96/1-T, UMN-TH-1422-96 | hep-ph | null | The perturbative QCD corrections to the nonleptonic decay rate of the $b$
quark are discussed. By considering the limit where the final charmed quarks
are slow, it is argued that the coefficients of the $\alpha_s^2$ terms,
corresponding to next-to-next-to-leading order in the standard renormalization
group expansion in $\ln (m_W/m_b)$, are naturally large. The large coefficients
arise from the final-state gluon exchange between quarks and are associated
with the region of rather low momenta, which may further enhance the
phenomenological significance of these terms.
| [
{
"created": "Thu, 8 Feb 1996 17:32:37 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Voloshin",
"M. B.",
""
]
] | The perturbative QCD corrections to the nonleptonic decay rate of the $b$ quark are discussed. By considering the limit where the final charmed quarks are slow, it is argued that the coefficients of the $\alpha_s^2$ terms, corresponding to next-to-next-to-leading order in the standard renormalization group expansion in $\ln (m_W/m_b)$, are naturally large. The large coefficients arise from the final-state gluon exchange between quarks and are associated with the region of rather low momenta, which may further enhance the phenomenological significance of these terms. |
2212.11315 | Ruiwen Ouyang | Abdelhak Djouadi, Renato Fonseca, Ruiwen Ouyang, Martti Raidal | Non-supersymmetric SO(10) models with Gauge and Yukawa coupling
unification | 40 pages, 7 figures, Fig. 7 added compared to v1, comments are
welcome | null | 10.1140/epjc/s10052-023-11696-4 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study a non-supersymmetric SO(10) Grand Unification Theory with a very
high energy intermediate symmetry breaking scale in which not only gauge but
also Yukawa coupling unification are enforced via suitable threshold
corrections and matching conditions. For gauge unification, we focus on a few
symmetry breaking patterns with the intermediate gauge groups ${\rm SU(4)_C
\times SU(2)_L \times SU(2)_R}$ (Pati-Salam) and ${\rm SU(3)_C \times SU(2)_L
\times SU(2)_R\times U(1)_{B-L}}$ (minimal left-right symmetry) assuming an
additional global U(1) Peccei--Quinn symmetry, and having the Standard Model
supplemented by a second Higgs doublet field at the electroweak scale. We
derive the conditions as well as the approximate analytical solutions for the
unification of the gauge coupling constants at the two-loop level and discuss
the constraints from proton decay on the resulting high scale. Specializing to
the case of the Pati-Salam intermediate breaking pattern, we then impose also
the unification of the Yukawa couplings of third generation fermions at the
high scale, again at the two-loop level. In the considered context, Yukawa
unification implies a relation between the fermion couplings to the 10- and
126-dimensional scalar representations of the SO(10) group. We consider one
such possible relation which is obtainable in an ${\rm E_6}$ model where the
previous two scalar fields are part of a single multiplet. Taking into account
some phenomenological features such as the absence of flavor changing neutral
currents at tree-level, we derive constraints on the parameters of the low
energy model, in particular on the ratio of the two Higgs doublets vacuum
expectation values $\tan\beta$.
| [
{
"created": "Wed, 21 Dec 2022 19:24:06 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2023 22:49:19 GMT",
"version": "v2"
}
] | 2023-07-12 | [
[
"Djouadi",
"Abdelhak",
""
],
[
"Fonseca",
"Renato",
""
],
[
"Ouyang",
"Ruiwen",
""
],
[
"Raidal",
"Martti",
""
]
] | We study a non-supersymmetric SO(10) Grand Unification Theory with a very high energy intermediate symmetry breaking scale in which not only gauge but also Yukawa coupling unification are enforced via suitable threshold corrections and matching conditions. For gauge unification, we focus on a few symmetry breaking patterns with the intermediate gauge groups ${\rm SU(4)_C \times SU(2)_L \times SU(2)_R}$ (Pati-Salam) and ${\rm SU(3)_C \times SU(2)_L \times SU(2)_R\times U(1)_{B-L}}$ (minimal left-right symmetry) assuming an additional global U(1) Peccei--Quinn symmetry, and having the Standard Model supplemented by a second Higgs doublet field at the electroweak scale. We derive the conditions as well as the approximate analytical solutions for the unification of the gauge coupling constants at the two-loop level and discuss the constraints from proton decay on the resulting high scale. Specializing to the case of the Pati-Salam intermediate breaking pattern, we then impose also the unification of the Yukawa couplings of third generation fermions at the high scale, again at the two-loop level. In the considered context, Yukawa unification implies a relation between the fermion couplings to the 10- and 126-dimensional scalar representations of the SO(10) group. We consider one such possible relation which is obtainable in an ${\rm E_6}$ model where the previous two scalar fields are part of a single multiplet. Taking into account some phenomenological features such as the absence of flavor changing neutral currents at tree-level, we derive constraints on the parameters of the low energy model, in particular on the ratio of the two Higgs doublets vacuum expectation values $\tan\beta$. |
hep-ph/0311037 | Yg Kim | S. Y. Choi and Y. G. Kim | Analysis of the Neutralino System in Two--Body Decays of Neutralinos | 14 pages, 3 figures, minor revision, to appear in Phys. Rev. D | Phys.Rev. D69 (2004) 015011 | 10.1103/PhysRevD.69.015011 | KIAS-P03079, KUPT-03-04 | hep-ph | null | In the minimal supersymmetric standard model (MSSM), the neutralinos, the
spin--1/2 Majorana superpartners of the neutral gauge and Higgs bosons, are
expected to be among the light supersymmetric particles that can be produced
copiously at future high--energy colliders. We analyze two--body neutralino
decays into a neutralino plus a $Z$ boson or a lightest neutral Higgs boson
$h$, allowing the relevant parameters to have complex phases. We show that the
two--body tree--level decays of neutralinos are kinematically allowed in a
large region of the MSSM parameter space and they can provide us with a
powerful probe of the Majorana nature and CP properties of the neutralinos
through the $Z$--boson polarization measured from $Z$--boson leptonic decays.
| [
{
"created": "Tue, 4 Nov 2003 05:17:04 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2003 05:34:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Choi",
"S. Y.",
""
],
[
"Kim",
"Y. G.",
""
]
] | In the minimal supersymmetric standard model (MSSM), the neutralinos, the spin--1/2 Majorana superpartners of the neutral gauge and Higgs bosons, are expected to be among the light supersymmetric particles that can be produced copiously at future high--energy colliders. We analyze two--body neutralino decays into a neutralino plus a $Z$ boson or a lightest neutral Higgs boson $h$, allowing the relevant parameters to have complex phases. We show that the two--body tree--level decays of neutralinos are kinematically allowed in a large region of the MSSM parameter space and they can provide us with a powerful probe of the Majorana nature and CP properties of the neutralinos through the $Z$--boson polarization measured from $Z$--boson leptonic decays. |
0905.1344 | Zhenyu Han | Hsin-Chia Cheng, John F. Gunion, Zhenyu Han (UC Davis), and Bob
McElrath (CERN) | Accurate Mass Determinations in Decay Chains with Missing Energy: II | v2, published version in PRD | Phys.Rev.D80:035020,2009 | 10.1103/PhysRevD.80.035020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss kinematic methods for determining the masses of the particles in
events at a hadron collider in which a pair of identical particles is produced
with each decaying via a series of on-shell intermediate beyond-the-SM (BSM)
particles to visible SM particles and an invisible particle (schematically, pp
-> ZZ + jets with Z -> Aa -> Bba -> Ccba -> ... -> cba... + N where a,b,c,...
are visible SM particles or groups of SM particles, A,B,C,... are on-shell BSM
particles and N is invisible). This topology arises in many models including
SUSY processes such as squark and gluino pair production and decay. We present
the detailed procedure for the case of Z -> 3 visible particles + N and
demonstrate that the masses obtained from the kinematic procedure are
independent of the model by comparing SUSY to UED.
| [
{
"created": "Fri, 8 May 2009 21:28:43 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 2010 18:17:50 GMT",
"version": "v2"
}
] | 2010-05-21 | [
[
"Cheng",
"Hsin-Chia",
"",
"UC Davis"
],
[
"Gunion",
"John F.",
"",
"UC Davis"
],
[
"Han",
"Zhenyu",
"",
"UC Davis"
],
[
"McElrath",
"Bob",
"",
"CERN"
]
] | We discuss kinematic methods for determining the masses of the particles in events at a hadron collider in which a pair of identical particles is produced with each decaying via a series of on-shell intermediate beyond-the-SM (BSM) particles to visible SM particles and an invisible particle (schematically, pp -> ZZ + jets with Z -> Aa -> Bba -> Ccba -> ... -> cba... + N where a,b,c,... are visible SM particles or groups of SM particles, A,B,C,... are on-shell BSM particles and N is invisible). This topology arises in many models including SUSY processes such as squark and gluino pair production and decay. We present the detailed procedure for the case of Z -> 3 visible particles + N and demonstrate that the masses obtained from the kinematic procedure are independent of the model by comparing SUSY to UED. |
hep-ph/0311175 | Antoni Szczurek | Antoni Szczurek | Unintegrated parton distributions and particle production in hadronic
collisions | 8 pages, 4 figures, a talk presented at the XXXIII International
Symposium on Multiparticle Dynamics, 5-11 September 2003, Cracow, Poland | Acta Phys.Polon. B35 (2004) 161-168 | null | null | hep-ph nucl-th | null | The inclusive distributions of gluons and pions for high-energy NN collisions
are calculated. The results for several unintegrated gluon distributions
(UGD's) from the literature are compared. We find huge differences in both
rapidity and $p_t$ of gluons and $\pi$'s in NN collisions for different models
of UGD's. The Karzeev-Levin UGD gives good description of momentum distribution
of charged hadrons at midrapidities. We find, however, that the gluonic
mechanism discussed does not describe the inclusive spectra of charged
particles in the fragmentation region. Some of the missing mechanisms are
calculated with the help of unintegrated parton distributions from the solution
of the CCFM equation.
| [
{
"created": "Thu, 13 Nov 2003 18:22:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Szczurek",
"Antoni",
""
]
] | The inclusive distributions of gluons and pions for high-energy NN collisions are calculated. The results for several unintegrated gluon distributions (UGD's) from the literature are compared. We find huge differences in both rapidity and $p_t$ of gluons and $\pi$'s in NN collisions for different models of UGD's. The Karzeev-Levin UGD gives good description of momentum distribution of charged hadrons at midrapidities. We find, however, that the gluonic mechanism discussed does not describe the inclusive spectra of charged particles in the fragmentation region. Some of the missing mechanisms are calculated with the help of unintegrated parton distributions from the solution of the CCFM equation. |
1011.3918 | Massimiliano Grazzini | S. Catani, M. Grazzini | QCD transverse-momentum resummation in gluon fusion processes | 27 pages, no figures | Nucl.Phys.B845:297-323,2011 | 10.1016/j.nuclphysb.2010.12.007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the production of a generic system of non-strongly interacting
particles with a high total invariant mass M in hadron collisions. We examine
the transverse-momentum (q_T) distribution of the system in the small-q_T
region (q_T << M), and we present a study of the perturbative QCD contributions
that are enhanced by powers of large logarithmic terms of the type ln
(M^2/q_T^2). These terms can be resummed to all orders in QCD perturbation
theory. The partonic production mechanism of the final-state system can be
controlled by quark-antiquark (qqbar) annihilation and/or by gluon fusion. The
resummation formalism for the qqbar annihilation subprocess is well
established, and it is usually extrapolated to the gluon fusion subprocess. We
point out that this naive extrapolation is not correct, and we present the
all-order resummation formula for the q_T distribution in gluon fusion
processes. The gluon fusion resummation formula has a richer structure than the
resummation formula in qqbar annihilation. The additional structure originates
from collinear correlations that are a specific feature of the evolution of the
colliding hadrons into gluon partonic states. In the q_T cross section at small
values of q_T, these gluon collinear correlations produce coherent spin
correlations between the helicity states of the initial-state gluons and
definite azimuthal-angle correlations between the final-state particles of the
observed high-mass system.
| [
{
"created": "Wed, 17 Nov 2010 09:53:10 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Catani",
"S.",
""
],
[
"Grazzini",
"M.",
""
]
] | We consider the production of a generic system of non-strongly interacting particles with a high total invariant mass M in hadron collisions. We examine the transverse-momentum (q_T) distribution of the system in the small-q_T region (q_T << M), and we present a study of the perturbative QCD contributions that are enhanced by powers of large logarithmic terms of the type ln (M^2/q_T^2). These terms can be resummed to all orders in QCD perturbation theory. The partonic production mechanism of the final-state system can be controlled by quark-antiquark (qqbar) annihilation and/or by gluon fusion. The resummation formalism for the qqbar annihilation subprocess is well established, and it is usually extrapolated to the gluon fusion subprocess. We point out that this naive extrapolation is not correct, and we present the all-order resummation formula for the q_T distribution in gluon fusion processes. The gluon fusion resummation formula has a richer structure than the resummation formula in qqbar annihilation. The additional structure originates from collinear correlations that are a specific feature of the evolution of the colliding hadrons into gluon partonic states. In the q_T cross section at small values of q_T, these gluon collinear correlations produce coherent spin correlations between the helicity states of the initial-state gluons and definite azimuthal-angle correlations between the final-state particles of the observed high-mass system. |
hep-ph/9504401 | Elizabeth H. Simmons | E.H. Simmons (Boston Univ.) and P. Cho (Caltech) | Anomalous Gluon Self-Interactions and $t \bar{t}$ Production | Latex file using [aps,aipbook,floats,epsf]{revtex}. 12 pages, 4
Postscript figures. Full PS copy at http://smyrd.bu.edu/htfigs/htfigs.html
Talk presented by EHS at the International Symposium on Vector Boson
Self-Interactions, UCLA, Feb. 1-3, 1995 | null | 10.1063/1.49294 | BUHEP-95-14 | hep-ph | null | Strong-interaction physics that lies beyond the standard model may
conveniently be described by an effective Lagrangian. The only genuinely
gluonic CP-conserving term at dimension six is the three-gluon-field-strength
operator $G^3$. This operator, which alters the 3-gluon and 4-gluon vertices
form their standard model forms, turns out to be difficult to detect in final
states containing light jets. Its effects on top quark pair production hold the
greatest promise of visibility.
| [
{
"created": "Wed, 26 Apr 1995 18:49:29 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 1995 13:36:21 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Simmons",
"E. H.",
"",
"Boston Univ."
],
[
"Cho",
"P.",
"",
"Caltech"
]
] | Strong-interaction physics that lies beyond the standard model may conveniently be described by an effective Lagrangian. The only genuinely gluonic CP-conserving term at dimension six is the three-gluon-field-strength operator $G^3$. This operator, which alters the 3-gluon and 4-gluon vertices form their standard model forms, turns out to be difficult to detect in final states containing light jets. Its effects on top quark pair production hold the greatest promise of visibility. |
1107.2902 | Gorazd Cvetic | Gorazd Cveti\v{c}, Reinhart K\"ogerler | Applying generalized Pad\'e approximants in analytic QCD models | 14 pages; extended presentation of the analytic QCD models in Sec.IV;
two references added ([37,38]); version to appear in Phys.Rev.D | null | 10.1103/PhysRevD.84.056005 | USM-TH-291 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method of resummation of truncated perturbation series, related to diagonal
Pad\'e approximants but giving results independent of the renormalization
scale, was developed more than ten years ago by us with a view of applying it
in perturbative QCD. We now apply this method in analytic QCD models, i.e.,
models where the running coupling has no unphysical singularities, and we show
that the method has attractive features such as a rapid convergence. The method
can be regarded as a generalization of the scale-setting methods of Stevenson,
Grunberg, and Brodsky-Lepage-Mackenzie. The method involves the fixing of
various scales and weight coefficients via an auxiliary construction of
diagonal Pad\'e approximant. In low-energy QCD observables, some of these
scales become sometimes low at high order, which prevents the method from being
effective in perturbative QCD where the coupling has unphysical singularities
at low spacelike momenta. There are no such problems in analytic QCD.
| [
{
"created": "Thu, 14 Jul 2011 19:23:45 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Aug 2011 16:14:08 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Cvetič",
"Gorazd",
""
],
[
"Kögerler",
"Reinhart",
""
]
] | A method of resummation of truncated perturbation series, related to diagonal Pad\'e approximants but giving results independent of the renormalization scale, was developed more than ten years ago by us with a view of applying it in perturbative QCD. We now apply this method in analytic QCD models, i.e., models where the running coupling has no unphysical singularities, and we show that the method has attractive features such as a rapid convergence. The method can be regarded as a generalization of the scale-setting methods of Stevenson, Grunberg, and Brodsky-Lepage-Mackenzie. The method involves the fixing of various scales and weight coefficients via an auxiliary construction of diagonal Pad\'e approximant. In low-energy QCD observables, some of these scales become sometimes low at high order, which prevents the method from being effective in perturbative QCD where the coupling has unphysical singularities at low spacelike momenta. There are no such problems in analytic QCD. |
2108.13136 | Jacek Ksawery Osi\'nski | Rouzbeh Allahverdi and Jacek K. Osi\'nski | Early Matter Domination from Long-Lived Particles in the Visible Sector | 15 pages, 8 figures; reference added | null | 10.1103/PhysRevD.105.023502 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a nonstandard cosmological history with a period of early matter
domination driven by a sub-TeV visible-sector particle can arise rather
naturally. This scenario involves a long-lived standard model singlet that
acquires a thermal abundance at high temperatures from decays and inverse
decays of a parent particle with SM charge(s), and subsequently dominates the
energy density of the Universe as a frozen species. Entropy generation at the
end of early matter domination dilutes the abundance of dangerous relics (such
as gravitinos) by a factor as large as $10^4$. The scenario can accommodate the
correct dark matter relic abundance for cases with $\langle \sigma_{\rm ann} v
\rangle_{\rm f} \lessgtr 3 \times 10^{-26}$cm$^3$s$^{-1}$. More importantly,
the allowed parameter space can be directly probed by proposed searches for
neutral long-lived particles at the energy frontier, allowing us to use
particle physics experiments to reconstruct the cosmological history just prior
to big bang nucleosynthesis.
| [
{
"created": "Mon, 30 Aug 2021 11:50:20 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Sep 2021 10:33:04 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Osiński",
"Jacek K.",
""
]
] | We show that a nonstandard cosmological history with a period of early matter domination driven by a sub-TeV visible-sector particle can arise rather naturally. This scenario involves a long-lived standard model singlet that acquires a thermal abundance at high temperatures from decays and inverse decays of a parent particle with SM charge(s), and subsequently dominates the energy density of the Universe as a frozen species. Entropy generation at the end of early matter domination dilutes the abundance of dangerous relics (such as gravitinos) by a factor as large as $10^4$. The scenario can accommodate the correct dark matter relic abundance for cases with $\langle \sigma_{\rm ann} v \rangle_{\rm f} \lessgtr 3 \times 10^{-26}$cm$^3$s$^{-1}$. More importantly, the allowed parameter space can be directly probed by proposed searches for neutral long-lived particles at the energy frontier, allowing us to use particle physics experiments to reconstruct the cosmological history just prior to big bang nucleosynthesis. |
hep-ph/0602076 | Kang Young Lee | C.S. Kim, Chaehyun Yu, and Kang Young Lee | Probing CP Violating Two Higgs Doublet Model through Interplay between
LHC and ILC | 10 pages, 3 figures | null | null | KAIST-TH 2005/20 | hep-ph | null | We study the neutral Higgs boson production at the CERN Large Hadron Collider
(LHC) and the future $e^- e^+$ linear collider (ILC) in the two Higgs doublet
model with CP violation. The CP-even and CP-odd scalars are mixed in this
model, which affects the production processes of neutral Higgs boson. We
examine the correlation of the Higgs production at LHC and ILC and provide a
strategy to distinguish the model from the CP conserving model and to determine
the parameters of the Higgs sector.
| [
{
"created": "Thu, 9 Feb 2006 06:36:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"C. S.",
""
],
[
"Yu",
"Chaehyun",
""
],
[
"Lee",
"Kang Young",
""
]
] | We study the neutral Higgs boson production at the CERN Large Hadron Collider (LHC) and the future $e^- e^+$ linear collider (ILC) in the two Higgs doublet model with CP violation. The CP-even and CP-odd scalars are mixed in this model, which affects the production processes of neutral Higgs boson. We examine the correlation of the Higgs production at LHC and ILC and provide a strategy to distinguish the model from the CP conserving model and to determine the parameters of the Higgs sector. |
0909.0558 | Michael Eides | Michael I. Eides and Valery A. Shelyuto | Radiative-Recoil Corrections to Hyperfine Splitting: Polarization
Insertions in the Muon Factor | 10 pages, 4 figures | Phys.Rev.D80:053008,2009 | 10.1103/PhysRevD.80.053008 | UK/09-06 | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider three-loop radiative-recoil corrections to hyperfine splitting in
muonium due to insertions of one-loop polarization operator in the muon factor.
The contribution produced by electron polarization insertions are enhanced by
the large logarithm of the electron-muon mass ratio. We obtained all
single-logarithmic and nonlogarithmic radiative-recoil corrections of order
$\alpha^3(m/M)E_F$ generated by the diagrams with electron and muon
polarization insertions.
| [
{
"created": "Thu, 3 Sep 2009 01:00:15 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Eides",
"Michael I.",
""
],
[
"Shelyuto",
"Valery A.",
""
]
] | We consider three-loop radiative-recoil corrections to hyperfine splitting in muonium due to insertions of one-loop polarization operator in the muon factor. The contribution produced by electron polarization insertions are enhanced by the large logarithm of the electron-muon mass ratio. We obtained all single-logarithmic and nonlogarithmic radiative-recoil corrections of order $\alpha^3(m/M)E_F$ generated by the diagrams with electron and muon polarization insertions. |
0911.4132 | Andrey Katz | Andrey Katz and Brock Tweedie | Signals of a Sneutrino (N)LSP at the LHC | 41 pages, 13 figures. V2: Tau-tau background added and background
discussion in subsection V.C modified. Short discussion about early discovery
in subsection V.D added. Minors changes and refs. added | Phys.Rev.D81:035012,2010 | 10.1103/PhysRevD.81.035012 | UMD-PP-09-061 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sneutrino is a viable candidate for the NLSP in SUSY spectra with
gravitino LSP. In this work we study the collider implications of this
possibility. In particular, we investigate whether the LHC can distinguish it
(at least, in some cases) from alternative spectra, such as those with a
neutralino LSP. We show that there exists a complete family of experimentally
allowed and theoretically motivated spectra with sneutrino NLSP, which exhibit
very distinctive multilepton signals that are difficult to fake within the
MSSM. We study these signals in detail, including the techniques necessary to
find them. We demonstrate our analysis approach on simulations incorporating
backgrounds.
| [
{
"created": "Sun, 22 Nov 2009 21:49:40 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2010 19:08:44 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Katz",
"Andrey",
""
],
[
"Tweedie",
"Brock",
""
]
] | The sneutrino is a viable candidate for the NLSP in SUSY spectra with gravitino LSP. In this work we study the collider implications of this possibility. In particular, we investigate whether the LHC can distinguish it (at least, in some cases) from alternative spectra, such as those with a neutralino LSP. We show that there exists a complete family of experimentally allowed and theoretically motivated spectra with sneutrino NLSP, which exhibit very distinctive multilepton signals that are difficult to fake within the MSSM. We study these signals in detail, including the techniques necessary to find them. We demonstrate our analysis approach on simulations incorporating backgrounds. |
hep-ph/0610412 | Theodore Tomaras | Theodore N. Tomaras | Brane-bulk energy exchange and the Universe as a global attractor | Invited talk at the International Seminar "Quarks-2006"; Repino, St.
Petersburg, 19-25 May, 2006. 7 pages, 2 figures, revtex | null | null | null | hep-ph | null | The assumption that our Universe is close to a late time fixed point of the
equations of cosmology, leads to a modification of the latter to include energy
exchange between the matter and the "dark energy". The brane-world scenario
provides a natural set-up for such energy exchange and is analyzed in detail.
The role of brane-bulk energy exchange and of an induced gravity term on a
single braneworld of negative tension and vanishing effective cosmological
constant is studied. It is shown that for the physically interesting cases of
dust and radiation a unique global attractor which can realize our present
universe (accelerating and $0<\Omega_{m0}<1$) exists for a wide range of the
parameters of the model. For $\Omega_{m0}=0.3$, independently of the other
parameters, the model predicts that the equation of state for the dark energy
today is $w_{DE,0}=-1.4$, while $\Omega_{m0}=0.03$ leads to $w_{DE,0}=-1.03$.
In addition, during its evolution, $w_{DE}$ crosses the $w_{DE}=-1$ line to
smaller values.
| [
{
"created": "Mon, 30 Oct 2006 14:31:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tomaras",
"Theodore N.",
""
]
] | The assumption that our Universe is close to a late time fixed point of the equations of cosmology, leads to a modification of the latter to include energy exchange between the matter and the "dark energy". The brane-world scenario provides a natural set-up for such energy exchange and is analyzed in detail. The role of brane-bulk energy exchange and of an induced gravity term on a single braneworld of negative tension and vanishing effective cosmological constant is studied. It is shown that for the physically interesting cases of dust and radiation a unique global attractor which can realize our present universe (accelerating and $0<\Omega_{m0}<1$) exists for a wide range of the parameters of the model. For $\Omega_{m0}=0.3$, independently of the other parameters, the model predicts that the equation of state for the dark energy today is $w_{DE,0}=-1.4$, while $\Omega_{m0}=0.03$ leads to $w_{DE,0}=-1.03$. In addition, during its evolution, $w_{DE}$ crosses the $w_{DE}=-1$ line to smaller values. |
hep-ph/9602337 | null | Pran Nath | Textured Minimal and Extended Supergravity Unification and Implications
for Proton Stability | 14 pages, latex, no figures | Phys.Lett.B381:147-153,1996 | 10.1016/0370-2693(96)00593-X | NSF-ITP-96-04/NUB-TH-3131 | hep-ph | null | We construct a class of textured supergravity unified SU(5) models using
Planck scale corrections. We show that the texture constraints in the Higgs
doublet sector are insufficient in general to fully determine the textures in
the Higgs triplet sector. A classification of textured minimal parameter models
is given and their Higgs triplet textures computed under the constraint that
they possess the Georgi-Jarlskog textures in the Higgs doublet sector. It is
argued that additional dynamical assumptions are needed to remove the
ambiguity.The recently proposed extension of supergravity unification to
include a minimal exotic sector is free of this ambiguity and leads to unique
textures in the Higgs triplet sector. Implications for proton stability are
discussed.
| [
{
"created": "Sun, 18 Feb 1996 13:14:31 GMT",
"version": "v1"
}
] | 2011-06-02 | [
[
"Nath",
"Pran",
""
]
] | We construct a class of textured supergravity unified SU(5) models using Planck scale corrections. We show that the texture constraints in the Higgs doublet sector are insufficient in general to fully determine the textures in the Higgs triplet sector. A classification of textured minimal parameter models is given and their Higgs triplet textures computed under the constraint that they possess the Georgi-Jarlskog textures in the Higgs doublet sector. It is argued that additional dynamical assumptions are needed to remove the ambiguity.The recently proposed extension of supergravity unification to include a minimal exotic sector is free of this ambiguity and leads to unique textures in the Higgs triplet sector. Implications for proton stability are discussed. |
1505.03133 | Sven Heinemeyer | S. Borowka, T. Hahn, S. Heinemeyer, G. Heinrich, W. Hollik | Renormalization scheme dependence of the two-loop QCD corrections to the
neutral Higgs-boson masses in the MSSM | Discussion of Higgs field renormalization effects extended. arXiv
admin note: text overlap with arXiv:1404.7074 | null | 10.1140/epjc/s10052-015-3648-6 | MPP-2015-97, ZU-TH 11/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Reaching a theoretical accuracy in the prediction of the lightest MSSM
Higgs-boson mass, M_h, at the level of the current experimental precision
requires the inclusion of momentum-dependent contributions at the two-loop
level. Recently two groups presented the two-loop QCD momentum-dependent
corrections to Mh [1,2], using a hybrid on-shell--DRbar scheme, with apparently
different results. We show that the differences can be traced back to a
different renormalization of the top-quark mass, and that the claim in [2] of
an inconsistency in [1] is incorrect. We furthermore compare consistently the
results for M_h obtained with the top-quark mass renormalized on-shell and
DRbar. The latter calculation has been added to the FeynHiggs package and can
be used to estimate missing higher-order corrections beyond the two-loop level.
| [
{
"created": "Tue, 12 May 2015 19:41:05 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 2015 08:33:22 GMT",
"version": "v2"
}
] | 2015-09-30 | [
[
"Borowka",
"S.",
""
],
[
"Hahn",
"T.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Hollik",
"W.",
""
]
] | Reaching a theoretical accuracy in the prediction of the lightest MSSM Higgs-boson mass, M_h, at the level of the current experimental precision requires the inclusion of momentum-dependent contributions at the two-loop level. Recently two groups presented the two-loop QCD momentum-dependent corrections to Mh [1,2], using a hybrid on-shell--DRbar scheme, with apparently different results. We show that the differences can be traced back to a different renormalization of the top-quark mass, and that the claim in [2] of an inconsistency in [1] is incorrect. We furthermore compare consistently the results for M_h obtained with the top-quark mass renormalized on-shell and DRbar. The latter calculation has been added to the FeynHiggs package and can be used to estimate missing higher-order corrections beyond the two-loop level. |
1811.01853 | Ajjath A H | Ajjath A H, Pulak Banerjee, Amlan Chakraborty, Prasanna K. Dhani,
Pooja Mukherjee, Narayan Rana and V. Ravindran | Higgs pair production from bottom quark annihilation to NNLO in QCD | 30 pages, 6 figures, 3 tables | JHEP 1905 (2019) 030 | 10.1007/JHEP05(2019)030 | IMSc/2018/11/09, DESY 18--166, TIF-UNIMI-2018-9 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first results on the two-loop massless QCD corrections to the
four-point amplitude $b+\overline{b} \rightarrow H+H$ in the five flavor
scheme, treating bottom quarks as massless. This amplitude is sensitive to the
trilinear Higgs boson coupling. Our two-loop result for this amplitude
constitutes of purely virtual contributions to the next-to-next-to-leading
order QCD predictions for the production of a pair of Higgs bosons at the Large
Hadron Collider. Using these two loop amplitudes and exploiting the
universality of the soft contributions in perturbative QCD, we obtain the NNLO
QCD effects in the soft plus virtual approximation. We find that the inclusion
of higher order terms reduce the uncertainties resulting from the unphysical
renormalisation and factorisation scales.
| [
{
"created": "Mon, 5 Nov 2018 17:19:13 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2019 09:21:50 GMT",
"version": "v2"
}
] | 2019-06-03 | [
[
"H",
"Ajjath A",
""
],
[
"Banerjee",
"Pulak",
""
],
[
"Chakraborty",
"Amlan",
""
],
[
"Dhani",
"Prasanna K.",
""
],
[
"Mukherjee",
"Pooja",
""
],
[
"Rana",
"Narayan",
""
],
[
"Ravindran",
"V.",
""
]
] | We present the first results on the two-loop massless QCD corrections to the four-point amplitude $b+\overline{b} \rightarrow H+H$ in the five flavor scheme, treating bottom quarks as massless. This amplitude is sensitive to the trilinear Higgs boson coupling. Our two-loop result for this amplitude constitutes of purely virtual contributions to the next-to-next-to-leading order QCD predictions for the production of a pair of Higgs bosons at the Large Hadron Collider. Using these two loop amplitudes and exploiting the universality of the soft contributions in perturbative QCD, we obtain the NNLO QCD effects in the soft plus virtual approximation. We find that the inclusion of higher order terms reduce the uncertainties resulting from the unphysical renormalisation and factorisation scales. |
hep-ph/0106079 | M. Pickles | M. Pickles and A.C. Davis | Dynamics and Properties of Chiral Cosmic Strings | 12 pages, 6 figures included as .eps files | Phys.Lett. B520 (2001) 345-352 | 10.1016/S0370-2693(01)01185-6 | null | hep-ph astro-ph hep-th | null | Chiral cosmic strings naturally arise in many particle physics models, in
particular in supersymmetric theories with a D-term. These strings have a
single fermion zero mode in the core. We derive the general equation of motion
for such strings. In Minkowski space we give the self-intersections for an
arbitary varying current on the loop, showing that the self-intersection
probability is dominated by the fraction of loop with maximal charge. We show
how to relate the charge to the fermion condensation temperature, arguing that
strings which become current carrying at formation will automatically have a
maximal charge. Any daughter loops produced are likely to have the same charge
as the parent loop. Possible models for chiral cosmic strings are also
discussed and consequences for D-term inflation mentioned.
| [
{
"created": "Thu, 7 Jun 2001 15:44:41 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Pickles",
"M.",
""
],
[
"Davis",
"A. C.",
""
]
] | Chiral cosmic strings naturally arise in many particle physics models, in particular in supersymmetric theories with a D-term. These strings have a single fermion zero mode in the core. We derive the general equation of motion for such strings. In Minkowski space we give the self-intersections for an arbitary varying current on the loop, showing that the self-intersection probability is dominated by the fraction of loop with maximal charge. We show how to relate the charge to the fermion condensation temperature, arguing that strings which become current carrying at formation will automatically have a maximal charge. Any daughter loops produced are likely to have the same charge as the parent loop. Possible models for chiral cosmic strings are also discussed and consequences for D-term inflation mentioned. |
2102.09567 | Tanner Trickle | Ahmet Coskuner, Tanner Trickle, Zhengkang Zhang, Kathryn M. Zurek | Directional Detectability of Dark Matter With Single Phonon Excitations:
Target Comparison | 13 pages, 11 figures; updated to match published version | Phys. Rev. D 105, 015010, 2022 | 10.1103/PhysRevD.105.015010 | CALT-TH-2021-008 | hep-ph astro-ph.CO cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Single phonon excitations are sensitive probes of light dark matter in the
keV-GeV mass window. For anisotropic target materials, the signal depends on
the direction of the incoming dark matter wind and exhibits a daily modulation.
We discuss in detail the various sources of anisotropy, and carry out a
comparative study of 26 crystal targets, focused on sub-MeV dark matter
benchmarks. We compute the modulation reach for the most promising targets,
corresponding to the cross section where the daily modulation can be observed
for a given exposure, which allows us to combine the strength of DM-phonon
couplings and the amplitude of daily modulation. We highlight Al$_2$O$_3$
(sapphire), CaWO$_4$ and h-BN (hexagonal boron nitride) as the best polar
materials for recovering a daily modulation signal, which feature
$\mathcal{O}(1 - 100)\%$ variations of detection rates throughout the day,
depending on the dark matter mass and interaction. The directional nature of
single phonon excitations offers a useful handle to mitigate backgrounds, which
is crucial for fully realizing the discovery potential of near future
experiments.
| [
{
"created": "Thu, 18 Feb 2021 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2022 17:39:20 GMT",
"version": "v2"
}
] | 2022-01-12 | [
[
"Coskuner",
"Ahmet",
""
],
[
"Trickle",
"Tanner",
""
],
[
"Zhang",
"Zhengkang",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | Single phonon excitations are sensitive probes of light dark matter in the keV-GeV mass window. For anisotropic target materials, the signal depends on the direction of the incoming dark matter wind and exhibits a daily modulation. We discuss in detail the various sources of anisotropy, and carry out a comparative study of 26 crystal targets, focused on sub-MeV dark matter benchmarks. We compute the modulation reach for the most promising targets, corresponding to the cross section where the daily modulation can be observed for a given exposure, which allows us to combine the strength of DM-phonon couplings and the amplitude of daily modulation. We highlight Al$_2$O$_3$ (sapphire), CaWO$_4$ and h-BN (hexagonal boron nitride) as the best polar materials for recovering a daily modulation signal, which feature $\mathcal{O}(1 - 100)\%$ variations of detection rates throughout the day, depending on the dark matter mass and interaction. The directional nature of single phonon excitations offers a useful handle to mitigate backgrounds, which is crucial for fully realizing the discovery potential of near future experiments. |
1807.00503 | Giampiero Passarino | Giampiero Passarino (Turin U. & INFN, Turin) | Peaks and cusps: anomalous thresholds and LHC physics | null | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The behavior of scattering amplitudes in the vicinity of a physical-region
Landau singularity is considered. The impact on LHC processes is discussed.
| [
{
"created": "Mon, 2 Jul 2018 07:44:06 GMT",
"version": "v1"
}
] | 2018-07-03 | [
[
"Passarino",
"Giampiero",
"",
"Turin U. & INFN, Turin"
]
] | The behavior of scattering amplitudes in the vicinity of a physical-region Landau singularity is considered. The impact on LHC processes is discussed. |
hep-ph/0406193 | Joachim Bartels | J. Bartels, V.S.Fadin, L.N. Lipatov | Solution of the Fan Diagram Equation in 2+1 Dimensional QCD | 23 pages | Nucl.Phys. B698 (2004) 255-276 | 10.1016/j.nuclphysb.2004.07.035 | DESY-04-104 | hep-ph | null | We investigate the Balitsky-Kovchegov (BK) equation for D=3 space-time
dimensions, corresponding to one transverse coordinate, and we show that it can
be solved analytically. The explicit solutions are found in the linear
approximation and for the paricular cases when they do not depend on the impact
parameter of the dipole or on its rapidity. It is shown, that in a general case
different solutions are related by an infinite parameter group of
transformations. The key observation is that the equation has the
Kowalewskaya-Painlev\'{e} property, which gives the possibility of reducing the
non-linear problem to the solution of a linear integral equation.
| [
{
"created": "Thu, 17 Jun 2004 18:40:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bartels",
"J.",
""
],
[
"Fadin",
"V. S.",
""
],
[
"Lipatov",
"L. N.",
""
]
] | We investigate the Balitsky-Kovchegov (BK) equation for D=3 space-time dimensions, corresponding to one transverse coordinate, and we show that it can be solved analytically. The explicit solutions are found in the linear approximation and for the paricular cases when they do not depend on the impact parameter of the dipole or on its rapidity. It is shown, that in a general case different solutions are related by an infinite parameter group of transformations. The key observation is that the equation has the Kowalewskaya-Painlev\'{e} property, which gives the possibility of reducing the non-linear problem to the solution of a linear integral equation. |
hep-ph/9507347 | Marcelo M. De Francia | M. De Francia, H. Falomir, E. M. Santangelo | Cheshire Cat Scenario in a 3+1 dimensional Hybrid Chiral Bag | 16 pages, 3 uuencoded postscript figures, typing error corrected | Phys.Lett. B371 (1996) 285-292 | 10.1016/0370-2693(96)00002-0 | null | hep-ph nucl-th | null | The total energy in the two-phase chiral bag model is studied, including the
contribution due to the bag (Casimir energy plus energy of the valence quarks),
as well as the one coming from the Skyrmion in the external sector. A
consistent determination of the parameters of the model and the renormalization
constants in the energy is performed. The total energy shows an approximate
independence with the bag radius (separation limit between the phases), in
agreement with the Cheshire Cat Principle.
| [
{
"created": "Thu, 20 Jul 1995 00:57:47 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 1995 20:33:23 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"De Francia",
"M.",
""
],
[
"Falomir",
"H.",
""
],
[
"Santangelo",
"E. M.",
""
]
] | The total energy in the two-phase chiral bag model is studied, including the contribution due to the bag (Casimir energy plus energy of the valence quarks), as well as the one coming from the Skyrmion in the external sector. A consistent determination of the parameters of the model and the renormalization constants in the energy is performed. The total energy shows an approximate independence with the bag radius (separation limit between the phases), in agreement with the Cheshire Cat Principle. |
1102.4725 | Ilya Gorbunov N | G.A. Kozlov, I.N. Gorbunov | Dilaton decays into unparticles and a single photon | 9 pages, 2 figures | null | 10.1142/S0217751X11054024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of the vector $U$ -unparticle stuff and a single
photon in decays of a dilaton. The signals of an unparticle can be detected
through the missing energy and momentum distribution carried away by $U$ once
it was produced in radiative decay of a dilaton The continuous energy spectrum
of the emitted photons encoding the recoil unparticle can be measured in
precision studies of rare decays of the dilaton or Higgs-boson after their
discoveres.
| [
{
"created": "Wed, 23 Feb 2011 12:48:33 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Kozlov",
"G. A.",
""
],
[
"Gorbunov",
"I. N.",
""
]
] | We study the production of the vector $U$ -unparticle stuff and a single photon in decays of a dilaton. The signals of an unparticle can be detected through the missing energy and momentum distribution carried away by $U$ once it was produced in radiative decay of a dilaton The continuous energy spectrum of the emitted photons encoding the recoil unparticle can be measured in precision studies of rare decays of the dilaton or Higgs-boson after their discoveres. |
2207.10560 | Maria Elena Tejeda-Yeomans | Alejandro Ayala, Isabel Dom\'inguez, Ivonne Maldonado, Maria Elena
Tejeda-Yeomans | $\Lambda$ and $\bar{\Lambda}$ global polarization from the core-corona
model | Proceedings for the 37th Winter Workshop on Nuclear Dynamics | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We report on work aimed to describe the $\Lambda$ and $\bar{\Lambda}$ global
polarizations in a heavy-ion collision environment using the core-corona model,
where the source of these hyperons is a high-density core and a less dense
corona. We show that the overall properties of the polarization excitation
functions can be linked to the relative abundance of $\Lambda$s and
$\bar{\Lambda}$s coming from the core versus those coming from the corona. Both
global polarizations peak at collision energies $\sqrt{s_{NN}} \lesssim 10$
GeV. The exact positions and heights of these peaks depend not only on a
reversal of relative abundances with collision energy, but also on the
centrality class, both related to the QGP volume and lifetime.
| [
{
"created": "Thu, 21 Jul 2022 16:04:00 GMT",
"version": "v1"
}
] | 2022-07-22 | [
[
"Ayala",
"Alejandro",
""
],
[
"Domínguez",
"Isabel",
""
],
[
"Maldonado",
"Ivonne",
""
],
[
"Tejeda-Yeomans",
"Maria Elena",
""
]
] | We report on work aimed to describe the $\Lambda$ and $\bar{\Lambda}$ global polarizations in a heavy-ion collision environment using the core-corona model, where the source of these hyperons is a high-density core and a less dense corona. We show that the overall properties of the polarization excitation functions can be linked to the relative abundance of $\Lambda$s and $\bar{\Lambda}$s coming from the core versus those coming from the corona. Both global polarizations peak at collision energies $\sqrt{s_{NN}} \lesssim 10$ GeV. The exact positions and heights of these peaks depend not only on a reversal of relative abundances with collision energy, but also on the centrality class, both related to the QGP volume and lifetime. |
0907.0451 | Vadim Lensky | V. Lensky (ECT*, Trento and ITEP, Moscow), V. Pascalutsa (Mainz U. and
ECT*, Trento) | Predictive powers of chiral perturbation theory in Compton scattering
off protons | 24 pages, 9 figures, RevTeX4, revised version published in EPJ C | Eur.Phys.J.C65:195-209,2010 | 10.1140/epjc/s10052-009-1183-z | ECT*-09-06, MKPH-T-09-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study low-energy nucleon Compton scattering in the framework of baryon
chiral perturbation theory (B$\chi$PT) with pion, nucleon, and $\Delta$(1232)
degrees of freedom, up to and including the next-to-next-to-leading order
(NNLO). We include the effects of order $p^2$, $p^3$ and $p^4/\varDelta$, with
$\varDelta\approx 300$ MeV the $\Delta$-resonance excitation energy. These are
all "predictive" powers in the sense that no unknown low-energy constants enter
until at least one order higher (i.e, $p^4$). Estimating the theoretical
uncertainty on the basis of natural size for $p^4$ effects, we find that
uncertainty of such a NNLO result is comparable to the uncertainty of the
present experimental data for low-energy Compton scattering. We find an
excellent agreement with the experimental cross section data up to at least the
pion-production threshold. Nevertheless, for the proton's magnetic
polarizability we obtain a value of $(4.0\pm 0.7)\times 10^{-4}$ fm$^3$, in
significant disagreement with the current PDG value. Unlike the previous
$\chi$PT studies of Compton scattering, we perform the calculations in a
manifestly Lorentz-covariant fashion, refraining from the heavy-baryon (HB)
expansion. The difference between the lowest order HB$\chi$PT and B$\chi$PT
results for polarizabilities is found to be appreciable. We discuss the chiral
behavior of proton polarizabilities in both HB$\chi$PT and B$\chi$PT with the
hope to confront it with lattice QCD calculations in a near future. In studying
some of the polarized observables, we identify the regime where their naive
low-energy expansion begins to break down, thus addressing the forthcoming
precision measurements at the HIGS facility.
| [
{
"created": "Thu, 2 Jul 2009 18:31:11 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2009 12:42:41 GMT",
"version": "v2"
}
] | 2010-01-06 | [
[
"Lensky",
"V.",
"",
"ECT*, Trento and ITEP, Moscow"
],
[
"Pascalutsa",
"V.",
"",
"Mainz U. and\n ECT*, Trento"
]
] | We study low-energy nucleon Compton scattering in the framework of baryon chiral perturbation theory (B$\chi$PT) with pion, nucleon, and $\Delta$(1232) degrees of freedom, up to and including the next-to-next-to-leading order (NNLO). We include the effects of order $p^2$, $p^3$ and $p^4/\varDelta$, with $\varDelta\approx 300$ MeV the $\Delta$-resonance excitation energy. These are all "predictive" powers in the sense that no unknown low-energy constants enter until at least one order higher (i.e, $p^4$). Estimating the theoretical uncertainty on the basis of natural size for $p^4$ effects, we find that uncertainty of such a NNLO result is comparable to the uncertainty of the present experimental data for low-energy Compton scattering. We find an excellent agreement with the experimental cross section data up to at least the pion-production threshold. Nevertheless, for the proton's magnetic polarizability we obtain a value of $(4.0\pm 0.7)\times 10^{-4}$ fm$^3$, in significant disagreement with the current PDG value. Unlike the previous $\chi$PT studies of Compton scattering, we perform the calculations in a manifestly Lorentz-covariant fashion, refraining from the heavy-baryon (HB) expansion. The difference between the lowest order HB$\chi$PT and B$\chi$PT results for polarizabilities is found to be appreciable. We discuss the chiral behavior of proton polarizabilities in both HB$\chi$PT and B$\chi$PT with the hope to confront it with lattice QCD calculations in a near future. In studying some of the polarized observables, we identify the regime where their naive low-energy expansion begins to break down, thus addressing the forthcoming precision measurements at the HIGS facility. |
2309.08756 | Valentina Mantovani Sarti | V. Mantovani Sarti, A. Feijoo, I. Vida\~na, A. Ramos, F. Giacosa, T.
Hyodo, Y. Kamiya | Constraining the low-energy S=-2 meson-baryon interaction with
two-particle correlations | null | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-particle correlation technique applied to $K^-\Lambda$ pairs in pp
collisions at LHC recently provided the most precise data on the strangeness
$S=-2$ meson-baryon interaction. In this letter, we use for the first time
femtoscopic data to constrain the parameters of a low-energy effective QCD
Lagrangian. The tuned model delivers new insights on the molecular nature of
the $\Xi(1620)$ and $\Xi(1690)$ states. This procedure opens the possibility to
determine higher order corrections, directly constraining QCD effective models
particularly in the multi-strange and charm sectors.
| [
{
"created": "Fri, 15 Sep 2023 20:54:59 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2023 11:28:51 GMT",
"version": "v2"
}
] | 2023-12-21 | [
[
"Sarti",
"V. Mantovani",
""
],
[
"Feijoo",
"A.",
""
],
[
"Vidaña",
"I.",
""
],
[
"Ramos",
"A.",
""
],
[
"Giacosa",
"F.",
""
],
[
"Hyodo",
"T.",
""
],
[
"Kamiya",
"Y.",
""
]
] | The two-particle correlation technique applied to $K^-\Lambda$ pairs in pp collisions at LHC recently provided the most precise data on the strangeness $S=-2$ meson-baryon interaction. In this letter, we use for the first time femtoscopic data to constrain the parameters of a low-energy effective QCD Lagrangian. The tuned model delivers new insights on the molecular nature of the $\Xi(1620)$ and $\Xi(1690)$ states. This procedure opens the possibility to determine higher order corrections, directly constraining QCD effective models particularly in the multi-strange and charm sectors. |
hep-ph/0008044 | Werner Rodejohann | W. Rodejohann (Dortmund University) | Cancellations in Neutrinoless Double Beta Decay and the Neutrino Mass
Matrix | 20 pages, 10 figures. Title, abstract and parts of the text changed | Nucl.Phys. B597 (2001) 110-126 | 10.1016/S0550-3213(00)00728-8 | DO-TH 00/12 | hep-ph | null | In a degenerate scheme with mass m_0 a complete analysis of the allowed range
of the effective electron neutrino Majorana mass <m> is performed. Special
attention is paid to effects of cancellations caused either by intrinsic CP
parities of the eigenstates (CP invariance) or by complex mixing matrix
elements (CP violation). We investigate all possibilities and give in each case
constraints on the phases, the relative CP parities or the neutrino mass scale.
A solar mixing angle \sin^2 2 \theta smaller than 0.7 jeopardizes the
degenerate mass scheme. A key value of <m>/m_0 is identified, which is
independent on the solar solution and would rule out certain schemes. Also it
would answer the question regarding the presence of CP violation. Even if a
total neutrino mass scale and an effective mass is measured, the value of the
phases or parities is not fixed, unless in some special cases. The resulting
uncertainty in the other mass matrix elements is at least of the same order
than the one stemming from nuclear matrix elements calculations.
| [
{
"created": "Fri, 4 Aug 2000 12:22:36 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2000 07:32:57 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Dec 2000 09:42:54 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Dec 2000 15:26:08 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Rodejohann",
"W.",
"",
"Dortmund University"
]
] | In a degenerate scheme with mass m_0 a complete analysis of the allowed range of the effective electron neutrino Majorana mass <m> is performed. Special attention is paid to effects of cancellations caused either by intrinsic CP parities of the eigenstates (CP invariance) or by complex mixing matrix elements (CP violation). We investigate all possibilities and give in each case constraints on the phases, the relative CP parities or the neutrino mass scale. A solar mixing angle \sin^2 2 \theta smaller than 0.7 jeopardizes the degenerate mass scheme. A key value of <m>/m_0 is identified, which is independent on the solar solution and would rule out certain schemes. Also it would answer the question regarding the presence of CP violation. Even if a total neutrino mass scale and an effective mass is measured, the value of the phases or parities is not fixed, unless in some special cases. The resulting uncertainty in the other mass matrix elements is at least of the same order than the one stemming from nuclear matrix elements calculations. |
hep-ph/9409411 | null | A.P.Kobushkin and A.I.Syamtomov | Deuteron Electromagnetic Form Factors in the Transitional Region Between
Nucleon-Meson and Quark-Gluon Pictures | LaTeX, 9 pages+(ps-figures), ITP-94-30E | Phys.Atom.Nucl. 58 (1995) 1477-1482; Yad.Fiz. 58N9 (1995)
1565-1571 | null | null | hep-ph | null | Experimental observables of the elastic eD-scattering in the region of
intermediate energies are discussed. We offer the analysis of the available
experimental data, which reproduces the results of the calculations with
popular $NN$-potentials at low energies ($Q^2\ll 1(GeV/c)^2$), but, at the same
time, provides the right asymptotic behavior of the deuteron e.m. form factors,
following from the quark counting rules, at high energies ($Q^2\gg
1(GeV/c)^2$). The numerical analysis developed allows to make certain
estimations of the characteristic energy scale, at what the consideration of
quark-gluon degrees of freedom in the deuteron becomes essential.
| [
{
"created": "Sat, 24 Sep 1994 14:38:28 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Kobushkin",
"A. P.",
""
],
[
"Syamtomov",
"A. I.",
""
]
] | Experimental observables of the elastic eD-scattering in the region of intermediate energies are discussed. We offer the analysis of the available experimental data, which reproduces the results of the calculations with popular $NN$-potentials at low energies ($Q^2\ll 1(GeV/c)^2$), but, at the same time, provides the right asymptotic behavior of the deuteron e.m. form factors, following from the quark counting rules, at high energies ($Q^2\gg 1(GeV/c)^2$). The numerical analysis developed allows to make certain estimations of the characteristic energy scale, at what the consideration of quark-gluon degrees of freedom in the deuteron becomes essential. |
2402.01836 | Alexei Prokudin | Oscar del Rio, Alexei Prokudin, Ignazio Scimemi, Alexey Vladimirov | Transverse Momentum Moments | 24 pages, 6 figures | null | null | IPARCOS-UCM-2024-007, JLAB-THY-24-3989 | hep-ph hep-ex hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish robust relations between Transverse Momentum Dependent
distributions (TMDs) and collinear distributions. We define weighted integrals
of TMDs that we call Transverse Momentum Moments (TMMs) and prove that TMMs are
equal to collinear distributions evaluated in some minimal subtraction scheme.
The conversion to the $\bar{MS}$-scheme can be done by a calculable factor,
which we derive up to three loops for some cases. We discuss in detail the
zeroth, the first, and the second TMMs and provide phenomenological results for
them based on the current extractions of TMDs. The results of this paper open
new avenues for theoretical and phenomenological investigation of the
three-dimensional and collinear hadron structures.
| [
{
"created": "Fri, 2 Feb 2024 19:00:04 GMT",
"version": "v1"
}
] | 2024-02-06 | [
[
"del Rio",
"Oscar",
""
],
[
"Prokudin",
"Alexei",
""
],
[
"Scimemi",
"Ignazio",
""
],
[
"Vladimirov",
"Alexey",
""
]
] | We establish robust relations between Transverse Momentum Dependent distributions (TMDs) and collinear distributions. We define weighted integrals of TMDs that we call Transverse Momentum Moments (TMMs) and prove that TMMs are equal to collinear distributions evaluated in some minimal subtraction scheme. The conversion to the $\bar{MS}$-scheme can be done by a calculable factor, which we derive up to three loops for some cases. We discuss in detail the zeroth, the first, and the second TMMs and provide phenomenological results for them based on the current extractions of TMDs. The results of this paper open new avenues for theoretical and phenomenological investigation of the three-dimensional and collinear hadron structures. |
1704.06188 | Filippo Sala | Filippo Sala, David M. Straub | A New Light Particle in B Decays? | 5 pages, 2 figures. v2: typos corrected, references and
clarifications added | null | 10.1016/j.physletb.2017.09.072 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility whether the tensions with SM expectations
observed in several b -> sll transitions, including hints for lepton flavour
non-universality, could be due to the decay of B into a new light resonance. We
find that qualitative agreement with the data can be obtained with a light
vector resonance dominantly decaying invisibly. This scenario predicts a shift
in the muon anomalous magnetic moment that could explain the long-standing
discrepancy. The most stringent constraint comes from searches for B decays
with missing energy. A striking prediction is a strong q^2 dependence of the
lepton flavour universality ratios R_K and R_K* that should allow to clearly
confirm or rule out this possibility experimentally. We also comment on the
possible connection of the invisible decay product with Dark Matter.
| [
{
"created": "Thu, 20 Apr 2017 15:31:36 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 17:30:09 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Sala",
"Filippo",
""
],
[
"Straub",
"David M.",
""
]
] | We investigate the possibility whether the tensions with SM expectations observed in several b -> sll transitions, including hints for lepton flavour non-universality, could be due to the decay of B into a new light resonance. We find that qualitative agreement with the data can be obtained with a light vector resonance dominantly decaying invisibly. This scenario predicts a shift in the muon anomalous magnetic moment that could explain the long-standing discrepancy. The most stringent constraint comes from searches for B decays with missing energy. A striking prediction is a strong q^2 dependence of the lepton flavour universality ratios R_K and R_K* that should allow to clearly confirm or rule out this possibility experimentally. We also comment on the possible connection of the invisible decay product with Dark Matter. |
2405.06062 | Teppei Kitahara | Syuhei Iguro, Teppei Kitahara, Ryoutaro Watanabe | Global fit to $b \to c\tau\nu$ anomaly 2024 Spring breeze | 45 pages, 5 figures, 6 tables, this paper builds upon an unpublished
manuscript arXiv:2210.10751 | null | null | KEK-TH-2614, P3H-24-024, TTP24-008, CHIBA-EP-262 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Recently, several new experimental results of the test of lepton flavor
universality (LFU) in $B\to D^{(\ast)}$ semi-leptonic decays were announced:
the first result of $R_{D}$ from the LHCb Run 1 data, the first results of
$R_{D}$ and $R_{D^\ast}$ from the LHCb Run 2 data, and the first result of
$R_{D^\ast}$ from the Belle II collaboration. Including these new data, a
global analysis still prefers the violation of the LFU between the tau and
light leptons. A new world average of the data from the BaBar, LHCb, Belle, and
Belle II collaborations is $R_{D} = 0.344 \pm 0.026$ and $R_{D^{\ast}} = 0.285
\pm 0.012$. Including this new data, we update a circumstance of the $b \to c
\tau \overline\nu$ measurements and their implications for new physics (NP).
Incorporating recent developments for the $B \to D^{(\ast)}$ form factors in
the Standard Model (SM), we observe a $4.3 \sigma$ deviation from the SM
prediction. Our updates also include; model-independent NP formulae for the
related observables; and the global fittings of parameters for leptoquark
scenarios as well as single NP operator scenarios. Furthermore, we show future
potential to indirectly distinguish different NP scenarios with the use of the
precise measurements of the polarization observables in $B\to D^{(\ast)}\tau
\overline\nu$ at the Belle II and the high-$p_{\rm T}$ flavored-tail searches
at the LHC. We also discuss an impact on the LFU violation in $\Upsilon \to l^+
l^-$.
| [
{
"created": "Mon, 8 Apr 2024 12:30:17 GMT",
"version": "v1"
}
] | 2024-05-27 | [
[
"Iguro",
"Syuhei",
""
],
[
"Kitahara",
"Teppei",
""
],
[
"Watanabe",
"Ryoutaro",
""
]
] | Recently, several new experimental results of the test of lepton flavor universality (LFU) in $B\to D^{(\ast)}$ semi-leptonic decays were announced: the first result of $R_{D}$ from the LHCb Run 1 data, the first results of $R_{D}$ and $R_{D^\ast}$ from the LHCb Run 2 data, and the first result of $R_{D^\ast}$ from the Belle II collaboration. Including these new data, a global analysis still prefers the violation of the LFU between the tau and light leptons. A new world average of the data from the BaBar, LHCb, Belle, and Belle II collaborations is $R_{D} = 0.344 \pm 0.026$ and $R_{D^{\ast}} = 0.285 \pm 0.012$. Including this new data, we update a circumstance of the $b \to c \tau \overline\nu$ measurements and their implications for new physics (NP). Incorporating recent developments for the $B \to D^{(\ast)}$ form factors in the Standard Model (SM), we observe a $4.3 \sigma$ deviation from the SM prediction. Our updates also include; model-independent NP formulae for the related observables; and the global fittings of parameters for leptoquark scenarios as well as single NP operator scenarios. Furthermore, we show future potential to indirectly distinguish different NP scenarios with the use of the precise measurements of the polarization observables in $B\to D^{(\ast)}\tau \overline\nu$ at the Belle II and the high-$p_{\rm T}$ flavored-tail searches at the LHC. We also discuss an impact on the LFU violation in $\Upsilon \to l^+ l^-$. |
2308.11612 | Gino Isidori | Gino Isidori | Flavor physics beyond the Standard Model and the Kobayashi-Maskawa
legacy | 17 pages, based on the talk given at the KM50 Symposium (KEK,
February 2023) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kobayashi-Maskawa (KM) hypothesis about the existence of a third
generation of quarks represents a cornerstone of the Standard Model (SM). Fifty
years after this seminal paper, flavor physics continues to represent a
privileged observatory on physics occurring at high energy scales. In this
paper I first review this statement using general effective-theory arguments,
highlighting some interesting modern lessons from the KM paper. I then discuss
some novel extensions of the SM based on the concept of flavor deconstruction:
the hypothesis that gauge interactions are manifestly flavor non universal in
the ultraviolet. The phenomenological consequences of this class of models are
also briefly illustrated.
| [
{
"created": "Tue, 22 Aug 2023 17:56:12 GMT",
"version": "v1"
}
] | 2023-08-23 | [
[
"Isidori",
"Gino",
""
]
] | The Kobayashi-Maskawa (KM) hypothesis about the existence of a third generation of quarks represents a cornerstone of the Standard Model (SM). Fifty years after this seminal paper, flavor physics continues to represent a privileged observatory on physics occurring at high energy scales. In this paper I first review this statement using general effective-theory arguments, highlighting some interesting modern lessons from the KM paper. I then discuss some novel extensions of the SM based on the concept of flavor deconstruction: the hypothesis that gauge interactions are manifestly flavor non universal in the ultraviolet. The phenomenological consequences of this class of models are also briefly illustrated. |
hep-ph/0402107 | Yue-Liang Wu | Wen-Yu Wang, Yue-Liang Wu and Yu-Feng Zhou | More Precise Determination of V_{cb} & V_{ub} and Direct CP Violation in
Charmless B Decays | RevTex 7 pages. To be published in JKPS | J.Korean Phys.Soc. 45 (2004) S459-S466 | null | null | hep-ph | null | More precise extractions on the two important CKM matrix elements $|V_{cb}|$
and $|V_{ub}|$ are presented up to $1/m_Q^2$ corrections based on the complete
heavy quark effective field theory (HQEFT) of QCD. The HQEFT as a large
component QCD provides us a complete theoretical framework for correctly and
systematically evaluating the subleading and higher order contributions in
$1/m_Q$ expansion of heavy quarks. A global analysis on charmless B decays is
made based on the isospin and SU(3) flavor symmetry. An isospin relation is
found to be very useful for studying SU(3) symmetry breaking effects of strong
phases and exploring new type of electroweak penguin effects. The direct CP
violation in charmless B decays is predicted and its precise measurement is
helpful either for testing SU(3) symmetry breaking effects of strong phases or
for probing new physics beyond standard model.
| [
{
"created": "Tue, 10 Feb 2004 12:44:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wang",
"Wen-Yu",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | More precise extractions on the two important CKM matrix elements $|V_{cb}|$ and $|V_{ub}|$ are presented up to $1/m_Q^2$ corrections based on the complete heavy quark effective field theory (HQEFT) of QCD. The HQEFT as a large component QCD provides us a complete theoretical framework for correctly and systematically evaluating the subleading and higher order contributions in $1/m_Q$ expansion of heavy quarks. A global analysis on charmless B decays is made based on the isospin and SU(3) flavor symmetry. An isospin relation is found to be very useful for studying SU(3) symmetry breaking effects of strong phases and exploring new type of electroweak penguin effects. The direct CP violation in charmless B decays is predicted and its precise measurement is helpful either for testing SU(3) symmetry breaking effects of strong phases or for probing new physics beyond standard model. |
1110.4443 | Bo-Qiang Ma | Nan Qin, Bo-Qiang Ma | Superluminal Neutrinos in the Minimal Standard Model Extension | 7 pages, 2 figures | Int.J.Mod.Phys.A 27 (2012) 1250045 | 10.1142/S0217751X12500455 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most recently, the measurement of the neutrino velocity with the OPERA
detector in the CNGS beam shows unexpected indication, that the muon neutrino
velocity, $v_{\nu}$, exceeds the velocity of light in the vacuum, $c$, which is
obviously in contradiction with the most basic hypothesis of modern physics.
Within the framework of minimal Standard Model Extension, we discuss the
modified dispersion relation and consequently the velocity-energy relation of
muon neutrinos. The simplified models are fit to the OPERA data, Fermilab
experiment and MINO data. We find that minimal Standard Extension can describe
these long baseline superluminal neutrinos to a good accuracy. For the
well-known tension between the OPERA measurement and the Supernova 1987A
neutrino observation, we discussed two ways out of the contradiction.
| [
{
"created": "Thu, 20 Oct 2011 04:56:14 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Mar 2012 17:45:15 GMT",
"version": "v2"
}
] | 2012-03-27 | [
[
"Qin",
"Nan",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | Most recently, the measurement of the neutrino velocity with the OPERA detector in the CNGS beam shows unexpected indication, that the muon neutrino velocity, $v_{\nu}$, exceeds the velocity of light in the vacuum, $c$, which is obviously in contradiction with the most basic hypothesis of modern physics. Within the framework of minimal Standard Model Extension, we discuss the modified dispersion relation and consequently the velocity-energy relation of muon neutrinos. The simplified models are fit to the OPERA data, Fermilab experiment and MINO data. We find that minimal Standard Extension can describe these long baseline superluminal neutrinos to a good accuracy. For the well-known tension between the OPERA measurement and the Supernova 1987A neutrino observation, we discussed two ways out of the contradiction. |
1505.04734 | Tania Robens | Agnieszka Ilnicka, Maria Krawczyk, Tania Robens | Constraining the Inert Doublet Model | 6 pages, 3 figures, to appear in the Proceedings of Toyama
International Workshop on Higgs as a Probe of New Physics 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a survey on current constraints on the Inert Doublet Model parameter
space, including all theoretical as well as experimental limits from collider
and astrophysical data. For allowed regions in the parameter space, we provide
total production cross sections for the pair-production of scalars at the 13
TeV LHC and propose benchmarks scenarios which should be investigated by the
LHC experiments at Run II.
| [
{
"created": "Mon, 18 May 2015 17:48:04 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Ilnicka",
"Agnieszka",
""
],
[
"Krawczyk",
"Maria",
""
],
[
"Robens",
"Tania",
""
]
] | We give a survey on current constraints on the Inert Doublet Model parameter space, including all theoretical as well as experimental limits from collider and astrophysical data. For allowed regions in the parameter space, we provide total production cross sections for the pair-production of scalars at the 13 TeV LHC and propose benchmarks scenarios which should be investigated by the LHC experiments at Run II. |
1505.01361 | Kristof De Bruyn | Lennaert Bel, Kristof De Bruyn, Robert Fleischer, Mick Mulder, Niels
Tuning | Anatomy of $B\rightarrow D\bar{D}$ Decays | 47 pages, 17 figures, matching published version | JHEP 1507 (2015) 108 | 10.1007/JHEP07(2015)108 | Nikhef-2015-019 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decays $B_d^0\rightarrow D_d^-D_d^+$ and $B_s^0\rightarrow D_s^-D_s^+$
probe the CP-violating mixing phases $\phi_d$ and $\phi_s$, respectively. The
theoretical uncertainty of the corresponding determinations is limited by
contributions from penguin topologies, which can be included with the help of
the $U$-spin symmetry of the strong interaction. We analyse the currently
available data for $B^0_{d,s}\rightarrow D_{d,s}^-D_{d,s}^+$ decays and those
with similar dynamics to constrain the involved non-perturbative parameters.
Using further information from semileptonic $B_d^0\rightarrow
D_d^-\ell^+\nu_{\ell}$ decays, we perform a test of the factorisation
approximation and take non-factorisable $SU(3)$-breaking corrections into
account. The branching ratios of the $B_d^0\rightarrow D_d^-D_d^+$,
$B_s^0\rightarrow D_s^-D_d^+$ and $B_s^0\rightarrow D_s^-D_s^+$,
$B_d^0\rightarrow D_d^-D_s^+$ decays show an interesting pattern which can be
accommodated through significantly enhanced exchange and penguin annihilation
topologies. This feature is also supported by data for the $B_s^0\rightarrow
D_d^-D_d^+$ channel. Moreover, there are indications of potentially enhanced
penguin contributions in the $B_d^0\rightarrow D_d^-D_d^+$ and
$B_s^0\rightarrow D_s^-D_s^+$ decays, which would make it mandatory to control
these effects in the future measurements of $\phi_d$ and $\phi_s$. We discuss
scenarios for high-precision measurements in the era of Belle II and the LHCb
upgrade.
| [
{
"created": "Wed, 6 May 2015 13:42:09 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2015 08:24:35 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jul 2015 14:09:44 GMT",
"version": "v3"
}
] | 2015-07-24 | [
[
"Bel",
"Lennaert",
""
],
[
"De Bruyn",
"Kristof",
""
],
[
"Fleischer",
"Robert",
""
],
[
"Mulder",
"Mick",
""
],
[
"Tuning",
"Niels",
""
]
] | The decays $B_d^0\rightarrow D_d^-D_d^+$ and $B_s^0\rightarrow D_s^-D_s^+$ probe the CP-violating mixing phases $\phi_d$ and $\phi_s$, respectively. The theoretical uncertainty of the corresponding determinations is limited by contributions from penguin topologies, which can be included with the help of the $U$-spin symmetry of the strong interaction. We analyse the currently available data for $B^0_{d,s}\rightarrow D_{d,s}^-D_{d,s}^+$ decays and those with similar dynamics to constrain the involved non-perturbative parameters. Using further information from semileptonic $B_d^0\rightarrow D_d^-\ell^+\nu_{\ell}$ decays, we perform a test of the factorisation approximation and take non-factorisable $SU(3)$-breaking corrections into account. The branching ratios of the $B_d^0\rightarrow D_d^-D_d^+$, $B_s^0\rightarrow D_s^-D_d^+$ and $B_s^0\rightarrow D_s^-D_s^+$, $B_d^0\rightarrow D_d^-D_s^+$ decays show an interesting pattern which can be accommodated through significantly enhanced exchange and penguin annihilation topologies. This feature is also supported by data for the $B_s^0\rightarrow D_d^-D_d^+$ channel. Moreover, there are indications of potentially enhanced penguin contributions in the $B_d^0\rightarrow D_d^-D_d^+$ and $B_s^0\rightarrow D_s^-D_s^+$ decays, which would make it mandatory to control these effects in the future measurements of $\phi_d$ and $\phi_s$. We discuss scenarios for high-precision measurements in the era of Belle II and the LHCb upgrade. |
1102.2795 | Daniele Binosi | Daniele Binosi | IR properties of Yang-Mills theories from the Batalin-Vilkovisky
formalism | 12 pages, 3 figures. v3: one typo in formula (2.14) corrected.
Contribution for the workshop "The many faces of QCD", 1-5 Nov 2010, Ghent,
Belgium | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The powerful quantization formalism of Batalin and Vilkovisky streamlines the
derivation of the complete set of (non-linear) identities arising from the
local BRST symmetry of Yang-Mills theories. When applied in the Background
Field Method type of gauges, it also gives rise to identities which relate
Green's functions involving background fields to Green's functions involving
quantum fields. All these identities lie at the core of the recent progress in
understanding from the continuum formulation the IR dynamics emerging from
lattice simulations. In this talk, we will first review the Batalin-Vilkovisky
formalism and then apply it to the problem of extracting the effective charge
from the available lattice data.
| [
{
"created": "Mon, 14 Feb 2011 15:16:04 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2011 14:08:52 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Jul 2011 10:24:51 GMT",
"version": "v3"
}
] | 2011-07-20 | [
[
"Binosi",
"Daniele",
""
]
] | The powerful quantization formalism of Batalin and Vilkovisky streamlines the derivation of the complete set of (non-linear) identities arising from the local BRST symmetry of Yang-Mills theories. When applied in the Background Field Method type of gauges, it also gives rise to identities which relate Green's functions involving background fields to Green's functions involving quantum fields. All these identities lie at the core of the recent progress in understanding from the continuum formulation the IR dynamics emerging from lattice simulations. In this talk, we will first review the Batalin-Vilkovisky formalism and then apply it to the problem of extracting the effective charge from the available lattice data. |
1404.4663 | Yue Zhang | Mark B. Wise, Yue Zhang | Effective Theory and Simple Completions for Neutrino Interactions | 12 pages, 2 figures | null | 10.1103/PhysRevD.90.053005 | CALT-68-2884 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider all the dimension 6 operators as well as some simple extensions
of the standard model that give new contributions to neutrino interactions with
matter. Such interactions are usually parametrized by $\epsilon_{\alpha
\beta}$, where $\alpha$ and $\beta$ are neutrino flavor indices taking the
values $e$, $\mu$ and $\tau$. In the simple models we consider the
$\epsilon_{\alpha \beta}$'s are much more constrained than in the
operator-based model-independent approach. Typically the $\epsilon_{\alpha
\beta}$'s are restricted to be smaller in magnitude than around $10^{-3}$. In
some of the leptoquark models, a specific pattern for the leptoquark Yukawa
couplings allows the diagonal element $\epsilon_{\tau\tau}$ to be as large as
$\sim0.1$, or one of $\epsilon_{ee}$, $\epsilon_{\mu\mu}\sim0.01$. We discuss
the interplay between neutrino physics and leptoquark searches at the LHC.
| [
{
"created": "Thu, 17 Apr 2014 22:16:46 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Wise",
"Mark B.",
""
],
[
"Zhang",
"Yue",
""
]
] | We consider all the dimension 6 operators as well as some simple extensions of the standard model that give new contributions to neutrino interactions with matter. Such interactions are usually parametrized by $\epsilon_{\alpha \beta}$, where $\alpha$ and $\beta$ are neutrino flavor indices taking the values $e$, $\mu$ and $\tau$. In the simple models we consider the $\epsilon_{\alpha \beta}$'s are much more constrained than in the operator-based model-independent approach. Typically the $\epsilon_{\alpha \beta}$'s are restricted to be smaller in magnitude than around $10^{-3}$. In some of the leptoquark models, a specific pattern for the leptoquark Yukawa couplings allows the diagonal element $\epsilon_{\tau\tau}$ to be as large as $\sim0.1$, or one of $\epsilon_{ee}$, $\epsilon_{\mu\mu}\sim0.01$. We discuss the interplay between neutrino physics and leptoquark searches at the LHC. |
2302.05471 | Carlos Mir\'o | Francisco J. Botella, Fernando Cornet-Gomez, Carlos Mir\'o, Miguel
Nebot | New Physics hints from $\tau$ scalar interactions and $(g-2)_{e,\mu}$ | 25 pages, 8 figures, 5 tables. Matches published version | null | null | IFIC/23-05 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider a flavour conserving two Higgs doublet model that consists of a
type I (or X) quark sector and a generalized lepton sector where the Yukawa
couplings of the charged leptons to the new scalars are not proportional to the
lepton masses. The model, previously proposed to solve both muon and electron
$g-2$ anomalies simultaneously, is also capable to accommodate the ATLAS excess
in $pp \rightarrow S \rightarrow \tau^{+}\tau^{-}$ with gluon-gluon fusion
production in the invariant mass range [0.2; 0.6] TeV, including all relevant
low and high energy constraints. The excess is reproduced taking into account
the new contributions from the scalar H, the pseudoscalar A, or both. In
particular, detailed numerical analyses favoured the solution with a
significant hierarchy among the vevs of the two Higgs doublets, $t_{\beta} \sim
10$, and light neutral scalars satisfying $m_\mathrm{A} > m_\mathrm{H}$ with
sizable couplings to $\tau$ leptons. In this region of the parameter space, the
muon $g-2$ anomaly receives one and two loop (Barr-Zee) contributions of
similar size, while the electron anomaly is explained at two loops. An
analogous ATLAS excess in $b$-associated production and the CMS excess in ditop
production are also studied. Further New Physics prospects concerning the
anomalous magnetic moment of the $\tau$ lepton and the implications of the CDF
$M_W$ measurement on the final results are discussed.
| [
{
"created": "Fri, 10 Feb 2023 19:04:41 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2023 10:50:41 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jan 2024 12:30:44 GMT",
"version": "v3"
}
] | 2024-01-12 | [
[
"Botella",
"Francisco J.",
""
],
[
"Cornet-Gomez",
"Fernando",
""
],
[
"Miró",
"Carlos",
""
],
[
"Nebot",
"Miguel",
""
]
] | We consider a flavour conserving two Higgs doublet model that consists of a type I (or X) quark sector and a generalized lepton sector where the Yukawa couplings of the charged leptons to the new scalars are not proportional to the lepton masses. The model, previously proposed to solve both muon and electron $g-2$ anomalies simultaneously, is also capable to accommodate the ATLAS excess in $pp \rightarrow S \rightarrow \tau^{+}\tau^{-}$ with gluon-gluon fusion production in the invariant mass range [0.2; 0.6] TeV, including all relevant low and high energy constraints. The excess is reproduced taking into account the new contributions from the scalar H, the pseudoscalar A, or both. In particular, detailed numerical analyses favoured the solution with a significant hierarchy among the vevs of the two Higgs doublets, $t_{\beta} \sim 10$, and light neutral scalars satisfying $m_\mathrm{A} > m_\mathrm{H}$ with sizable couplings to $\tau$ leptons. In this region of the parameter space, the muon $g-2$ anomaly receives one and two loop (Barr-Zee) contributions of similar size, while the electron anomaly is explained at two loops. An analogous ATLAS excess in $b$-associated production and the CMS excess in ditop production are also studied. Further New Physics prospects concerning the anomalous magnetic moment of the $\tau$ lepton and the implications of the CDF $M_W$ measurement on the final results are discussed. |
1411.4909 | Celso C. Nishi | C. C. Nishi | Compatible abelian symmetries in N-Higgs-Doublet Models | v2: 40pp; some modifications in text, brief discussion on the
supersymmetric case added; to appear in JHEP | JHEP03(2015)034 | 10.1007/JHEP03(2015)034 | UMD-PP-014-019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the compatibility between abelian symmetries acting in two
different sectors of a theory using the Smith Normal Form method. We focus on
N-Higgs-doublet models (NHDMs) and on the compatibility between symmetries in
the Higgs potential and in the Yukawa interactions, which were separately
analyzed previous works. It is shown that two equal (isomorphic) symmetry
groups that act in two separate sectors are not necessarily compatible in the
whole theory and an upper bound is found for the size of the group that can be
implemented in the entire NHDM. We also develop useful techniques to analyze
compatibility and extend a symmetry from one sector to another. Consequences to
the supersymmetric case are briefly discussed.
| [
{
"created": "Tue, 18 Nov 2014 16:55:40 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Mar 2015 20:13:22 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Nishi",
"C. C.",
""
]
] | We analyze the compatibility between abelian symmetries acting in two different sectors of a theory using the Smith Normal Form method. We focus on N-Higgs-doublet models (NHDMs) and on the compatibility between symmetries in the Higgs potential and in the Yukawa interactions, which were separately analyzed previous works. It is shown that two equal (isomorphic) symmetry groups that act in two separate sectors are not necessarily compatible in the whole theory and an upper bound is found for the size of the group that can be implemented in the entire NHDM. We also develop useful techniques to analyze compatibility and extend a symmetry from one sector to another. Consequences to the supersymmetric case are briefly discussed. |
hep-ph/9403316 | Georgios Lazarides | G.Lazarides and C.Panagiotakopoulos | Large $tan \beta$ from $SU(2)_R$ Gauge Symmetry | 13 pages, LaTeX, UT-STPD-1-94 | Phys.Lett.B337:90-94,1994 | 10.1016/0370-2693(94)91449-4 | null | hep-ph | null | Sufficient conditions for the relation $tan \beta \simeq m_t/m_b$ to hold in
supersymmetric grand unified theories are formulated. Essential ingredients are
the $SU(2)_R$ gauge symmetry and a discrete matter parity. The applicability of
our conditions is illustrated by specific examples. Implications for neutrino
masses are discussed.
| [
{
"created": "Fri, 18 Mar 1994 11:58:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lazarides",
"G.",
""
],
[
"Panagiotakopoulos",
"C.",
""
]
] | Sufficient conditions for the relation $tan \beta \simeq m_t/m_b$ to hold in supersymmetric grand unified theories are formulated. Essential ingredients are the $SU(2)_R$ gauge symmetry and a discrete matter parity. The applicability of our conditions is illustrated by specific examples. Implications for neutrino masses are discussed. |
1111.4965 | Roberto Pittau | R. Pittau (U. of Granada) | Primary Feynman rules to calculate the epsilon-dimensional integrand of
any 1-loop amplitude | 19 pages, 14 figures, uses axodraw.sty. Version accepted for
publication in JHEP | null | 10.1007/JHEP02(2012)029 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When using dimensional regularization/reduction the epsilon-dimensional
numerator of the 1-loop Feynman diagrams gives rise to rational contributions.
I list the set of fundamental rules that allow the extraction of such terms at
the integrand level in any theory containing scalars, vectors and fermions,
such as the electroweak standard model, QCD and SUSY.
| [
{
"created": "Mon, 21 Nov 2011 18:34:49 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2011 11:24:26 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Feb 2012 10:35:43 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Pittau",
"R.",
"",
"U. of Granada"
]
] | When using dimensional regularization/reduction the epsilon-dimensional numerator of the 1-loop Feynman diagrams gives rise to rational contributions. I list the set of fundamental rules that allow the extraction of such terms at the integrand level in any theory containing scalars, vectors and fermions, such as the electroweak standard model, QCD and SUSY. |
0810.4252 | Egle Tomasi-Gustafsson | E. A. Kuraev and E. Tomasi-Gustafsson | The two photon exchange amplitude in $ep$ and $e\mu $ elastic
scattering: a comparison | 10 pages, 4 figures | Phys.Part.Nucl.Lett.7:67-71,2010 | 10.1134/S1547477110020019 | dapnia-07-138 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we give arguments in favor of the statement that the
contribution of the box diagram calculated for electron muon elastic scattering
can be considered an upper limit to electron proton scattering. As an exact QED
calculation can be performed, this statement is useful for constraining model
calculations involving the proton structure.
| [
{
"created": "Thu, 23 Oct 2008 10:57:38 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Kuraev",
"E. A.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] | In this note we give arguments in favor of the statement that the contribution of the box diagram calculated for electron muon elastic scattering can be considered an upper limit to electron proton scattering. As an exact QED calculation can be performed, this statement is useful for constraining model calculations involving the proton structure. |
2111.11480 | Pedro Dedin Neto | Pedro Dedin Neto, Ernesto Kemp | Neutrino-(anti)neutrino forward scattering potential for massive
neutrinos at low energies | 21 pages, 6 figures; Changed to the MPLA template and Added a new
section connecting the result to the polarization vectors formalism | null | 10.1142/S0217732322500481 | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In this work, we calculate expression for the potential due to
neutrino-(anti)neutrino forward scattering at low energies ($E<<m_{Z^0}$) for
ultra-relativistic massive neutrinos ($E>>m_{\nu}$), a representative regime
within astrophysical scenarios. There is a broadly used expression for this
potential in the literature, which, however, lacks an explicit derivation from
basic principles of quantum field theory. Therefore, this paper has the
intention to guide the reader through the steps and concepts to derive this
potential, trying to be clear and pedagogical. Moreover, we used a rigorous
approach concerning the massive nature of the neutrinos, using massive
quantized neutrino fields throughout the entire process, while the usual
approach is to consider massless neutrino fields at the interaction. In this
context, we explicitly show the validity of the massless neutrino fields
approximation at the ultra-relativistic regime, as expected. As the last step,
we connect the potential expression to the density matrix formalism, which is a
usual framework for works considering neutrino-neutrino interactions. We also
discuss some theoretical details through the paper, such as the normal ordering
of quantum operators and the implications of massive fields in the neutrino
state at its production.
| [
{
"created": "Mon, 22 Nov 2021 19:18:29 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Nov 2021 14:27:24 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jan 2022 23:06:50 GMT",
"version": "v3"
}
] | 2022-04-07 | [
[
"Neto",
"Pedro Dedin",
""
],
[
"Kemp",
"Ernesto",
""
]
] | In this work, we calculate expression for the potential due to neutrino-(anti)neutrino forward scattering at low energies ($E<<m_{Z^0}$) for ultra-relativistic massive neutrinos ($E>>m_{\nu}$), a representative regime within astrophysical scenarios. There is a broadly used expression for this potential in the literature, which, however, lacks an explicit derivation from basic principles of quantum field theory. Therefore, this paper has the intention to guide the reader through the steps and concepts to derive this potential, trying to be clear and pedagogical. Moreover, we used a rigorous approach concerning the massive nature of the neutrinos, using massive quantized neutrino fields throughout the entire process, while the usual approach is to consider massless neutrino fields at the interaction. In this context, we explicitly show the validity of the massless neutrino fields approximation at the ultra-relativistic regime, as expected. As the last step, we connect the potential expression to the density matrix formalism, which is a usual framework for works considering neutrino-neutrino interactions. We also discuss some theoretical details through the paper, such as the normal ordering of quantum operators and the implications of massive fields in the neutrino state at its production. |
2004.10868 | Kunfeng Lyu | Kun-Feng Lyu, Emmanuel Stamou, Lian-Tao Wang | Self-interacting neutrinos: solution to Hubble tension versus
experimental constraints | 10 pages, 2 figures | Phys. Rev. D 103, 015004 (2021) | 10.1103/PhysRevD.103.015004 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exotic self-interactions among the Standard-Model neutrinos have been
proposed as a potential reason behind the tension in the expansion rate, H0, of
the universe inferred from different observations. We constrain this proposal
using electroweak precision observables, rare meson decays, and neutrinoless
double-\{beta} decay. In contrast to previous works, we emphasize the
importance of carrying out this study in a framework with full Standard-Model
gauge invariance. We implement this first by working with a relevant set of
Standard- Model-Effective-Field-Theory operators and subsequently by
considering a UV completion in the inverse See-Saw model. We find that the
scenario in which all flavors of neutrinos self-interact universally is
strongly constrained, disfavoring a potential solution to the H0 problem in
this case. The scenario with self-interactions only among tau neutrinos is the
least constrained and can potentially be consistent with a solution to the H0
problem.
| [
{
"created": "Wed, 22 Apr 2020 21:22:49 GMT",
"version": "v1"
}
] | 2021-01-13 | [
[
"Lyu",
"Kun-Feng",
""
],
[
"Stamou",
"Emmanuel",
""
],
[
"Wang",
"Lian-Tao",
""
]
] | Exotic self-interactions among the Standard-Model neutrinos have been proposed as a potential reason behind the tension in the expansion rate, H0, of the universe inferred from different observations. We constrain this proposal using electroweak precision observables, rare meson decays, and neutrinoless double-\{beta} decay. In contrast to previous works, we emphasize the importance of carrying out this study in a framework with full Standard-Model gauge invariance. We implement this first by working with a relevant set of Standard- Model-Effective-Field-Theory operators and subsequently by considering a UV completion in the inverse See-Saw model. We find that the scenario in which all flavors of neutrinos self-interact universally is strongly constrained, disfavoring a potential solution to the H0 problem in this case. The scenario with self-interactions only among tau neutrinos is the least constrained and can potentially be consistent with a solution to the H0 problem. |
hep-ph/0305123 | Kaminski | M. Gozdz, Wieslaw A. Kaminski, and A. Wodecki | Minimal supersymmetric standard model with gauge mediated supersymmetry
breaking and neutrinoless double beta decay | 10 pages, 7 figures | Phys.Rev. C69 (2004) 025501 | 10.1103/PhysRevC.69.025501 | null | hep-ph | null | The Minimal Supersymmetric Standard Model with gauge mediated supersymmetry
breaking and trilinear R-parity violation is applied to the description of
neutrinoless double beta decay. A detailed study of limits on the parameter
space coming from the B to (X,gamma) processes by using the recent CLEO results
is performed. The importance of two-nucleon and pion-exchange realizations of
neutrinoless double beta decay together with gluino and neutralino
contributions to this process are addressed. We have deduced new limits on the
trilinear R-parity breaking parameter lambda_{111}' from the non-observability
of 0 nu beta beta in several medium and heavy open-shell nuclei for different
gauge mediated breaking scenarios. In general, they are stronger than those
known from other analyses. Also some studies with respect to the future
neutrinoless double beta decay projects are presented.
| [
{
"created": "Mon, 12 May 2003 15:54:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gozdz",
"M.",
""
],
[
"Kaminski",
"Wieslaw A.",
""
],
[
"Wodecki",
"A.",
""
]
] | The Minimal Supersymmetric Standard Model with gauge mediated supersymmetry breaking and trilinear R-parity violation is applied to the description of neutrinoless double beta decay. A detailed study of limits on the parameter space coming from the B to (X,gamma) processes by using the recent CLEO results is performed. The importance of two-nucleon and pion-exchange realizations of neutrinoless double beta decay together with gluino and neutralino contributions to this process are addressed. We have deduced new limits on the trilinear R-parity breaking parameter lambda_{111}' from the non-observability of 0 nu beta beta in several medium and heavy open-shell nuclei for different gauge mediated breaking scenarios. In general, they are stronger than those known from other analyses. Also some studies with respect to the future neutrinoless double beta decay projects are presented. |
1310.5789 | Renato Zamora | M. Loewe, C. Villavicencio, R. Zamora | The Linear Sigma Model and the formation of a charged pion condensate in
the presence of an external magnetic field | 8 pages, 3 figures. Some changes as well as new references have been
added. Accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.89.016004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the charged pion condensation phenomenon in the linear sigma
model, in the presence of an external uniform magnetic field. The critical
temperature is obtained as a function of the external magnetic field, assuming
the transition is of second order, by considering a dilute gas at low
temperature. As a result we found magnetic anti-catalysis in the Bose-Einstein
condensation for lower values of the external magnetic field, and catalysis for
higher values of the external magnetic field. This behavior confirms previous
results with a single charged scalar field.
| [
{
"created": "Tue, 22 Oct 2013 03:19:24 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2013 23:20:24 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Loewe",
"M.",
""
],
[
"Villavicencio",
"C.",
""
],
[
"Zamora",
"R.",
""
]
] | We discuss the charged pion condensation phenomenon in the linear sigma model, in the presence of an external uniform magnetic field. The critical temperature is obtained as a function of the external magnetic field, assuming the transition is of second order, by considering a dilute gas at low temperature. As a result we found magnetic anti-catalysis in the Bose-Einstein condensation for lower values of the external magnetic field, and catalysis for higher values of the external magnetic field. This behavior confirms previous results with a single charged scalar field. |
hep-ph/0401159 | Matthias Burkardt | Matthias Burkardt (New Mexico State University) | Generalized Parton Distributions for large $x$ | 4 pages, revtex | Phys.Lett. B595 (2004) 245-249 | 10.1016/j.physletb.2004.05.070 | null | hep-ph | null | The $t$-dependence of generalized parton distrbutions for $x\to 1$ is
discussed. We argue that constituent quark models, where the $t$-dependence for
$x\to 1$ is through the product $(1-x)t$, are inconsistent. Instead we suggest
a leading dependence in terms of $(1-x)^n t$, where $n\geq 2$, for $x\to 1$.
| [
{
"created": "Wed, 21 Jan 2004 18:09:28 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jan 2004 17:52:58 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Jan 2004 12:34:27 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Burkardt",
"Matthias",
"",
"New Mexico State University"
]
] | The $t$-dependence of generalized parton distrbutions for $x\to 1$ is discussed. We argue that constituent quark models, where the $t$-dependence for $x\to 1$ is through the product $(1-x)t$, are inconsistent. Instead we suggest a leading dependence in terms of $(1-x)^n t$, where $n\geq 2$, for $x\to 1$. |
1707.00168 | Joao Pacheco B. C. de Melo Dr. | W. R. B. de Ar\'aujo (Secretaria de Educa\c{c}ao do Estado de S\~ao
Paulo), J.P. B. C. de Melo, K. Tsushima (Laborat\'orio de F\'isica Te\'orica
e Computacional, Universidade Cruzeiro do Sul) | Study of the in-medium nucleon electromagnetic form factors using a
light-front nucleon wave function combined with the quark-meson coupling
model | 39 pages, 11 figures. Revtex style. Title change, and news results
added. To appear Nuclear Physics A | null | 10.1016/j.nuclphysa.2017.12.005 | LFTC-17-5/5 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nucleon electromagnetic (EM) form factors in symmetric nuclear
matter as well as in vacuum within a light-front approach using the in-medium
inputs calculated by the quark-meson coupling model. The same in-medium quark
properties are used as those used for the study of in-medium pion properties.
The zero of the proton EM form factor ratio in vacuum, the electric to magnetic
form factor ratio $\mu_p G_{Ep}(Q^2)/G_{Mp}(Q^2)$ ($Q^2 = -q^2 > 0$ with $q$
being the four-momentum transfer), is determined including the latest
experimental data by implementing a hard constituent quark component in the
nucleon wave function. A reasonable fit is achieved for the ratio
$\mu_pG_{Ep}(Q^2)/G_{Mp}(Q^2)$ in vacuum, and we predict that the $Q_0^2$ value
to cross the zero of the ratio to be about 15 GeV$^2$. In addition the double
ratio data of the proton EM form factors in $^4$He and H nuclei, $[G^{^4{\rm
He}}_{Ep}(Q^2)/G^{^4{\rm He}}_{Mp}(Q^2)]/[G^{^1{\rm H}}_{Ep}(Q^2)/G^{^1{\rm
H}}_{Mp}(Q^2)]$, extracted by the polarized ($\vec{e}, e' \vec{p}$) scattering
experiment on $^4$He at JLab, are well described. We also predict that the
$Q_0^2$ value satisfying $\mu_pG_{Ep}(Q_0^2)/G_{Mp}(Q_0^2) = 0$ in symmetric
nuclear matter, shifts to a smaller value as increasing nuclear matter density,
which reflects the facts that the faster falloff of $G_{Ep}(Q^2)$ as increasing
$Q^2$ and the increase of the proton mean-square charge radius. Furthermore, we
calculate the neutron EM form factor double ratio in symmetric nuclear matter
for $0.1 < Q^2 < 1.0$ GeV$^2$. The result shows that the neutron double ratio
is enhanced relative to that in vacuum, while for the proton it is quenched,
and agrees with an existing theoretical prediction.
| [
{
"created": "Sat, 1 Jul 2017 15:40:57 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2017 18:34:46 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"de Aráujo",
"W. R. B.",
"",
"Secretaria de Educaçao do Estado de São\n Paulo"
],
[
"de Melo",
"J. P. B. C.",
"",
"Laboratório de Física Teórica\n e Computacional, Universidade Cruzeiro do Sul"
],
[
"Tsushima",
"K.",
"",
"Laboratório de Física Teórica\n e... | We study the nucleon electromagnetic (EM) form factors in symmetric nuclear matter as well as in vacuum within a light-front approach using the in-medium inputs calculated by the quark-meson coupling model. The same in-medium quark properties are used as those used for the study of in-medium pion properties. The zero of the proton EM form factor ratio in vacuum, the electric to magnetic form factor ratio $\mu_p G_{Ep}(Q^2)/G_{Mp}(Q^2)$ ($Q^2 = -q^2 > 0$ with $q$ being the four-momentum transfer), is determined including the latest experimental data by implementing a hard constituent quark component in the nucleon wave function. A reasonable fit is achieved for the ratio $\mu_pG_{Ep}(Q^2)/G_{Mp}(Q^2)$ in vacuum, and we predict that the $Q_0^2$ value to cross the zero of the ratio to be about 15 GeV$^2$. In addition the double ratio data of the proton EM form factors in $^4$He and H nuclei, $[G^{^4{\rm He}}_{Ep}(Q^2)/G^{^4{\rm He}}_{Mp}(Q^2)]/[G^{^1{\rm H}}_{Ep}(Q^2)/G^{^1{\rm H}}_{Mp}(Q^2)]$, extracted by the polarized ($\vec{e}, e' \vec{p}$) scattering experiment on $^4$He at JLab, are well described. We also predict that the $Q_0^2$ value satisfying $\mu_pG_{Ep}(Q_0^2)/G_{Mp}(Q_0^2) = 0$ in symmetric nuclear matter, shifts to a smaller value as increasing nuclear matter density, which reflects the facts that the faster falloff of $G_{Ep}(Q^2)$ as increasing $Q^2$ and the increase of the proton mean-square charge radius. Furthermore, we calculate the neutron EM form factor double ratio in symmetric nuclear matter for $0.1 < Q^2 < 1.0$ GeV$^2$. The result shows that the neutron double ratio is enhanced relative to that in vacuum, while for the proton it is quenched, and agrees with an existing theoretical prediction. |
hep-ph/0412280 | Maxim Pospelov | Maxim Pospelov | Ghosts and Tachyons in the Fifth Dimension | New references added | Int.J.Mod.Phys.A23:881-893,2008 | 10.1142/S0217751X08039384 | UVIC-TH-04-10 | hep-ph | null | We present several solutions for the five dimensional gravity models in the
presence of bulk ghosts and tachyons to argue that these "troublesome" fields
can be a useful model-building tool. The ghost-like signature of the kinetic
term for a bulk scalar creates a minimum in the scale factor, removing the
necessity for a negative tension brane in models with the compactified fifth
dimension. It is shown that the model with the positive tension branes and a
ghost field in the bulk leads to the radion stabilization. The bulk scalar with
the variable sign kinetic term can be used to model both positive and negative
tension branes of a finite width in the compact dimension. Finally, we present
several ghost and tachyon field configurations in the bulk that lead to the
localization of gravity in four dimensions, including one solution with the
Gaussian profile for the metric, g_{\mu\nu}(y)=\eta_{\mu\nu}\exp{-\alpha y^2},
which leads to a stronger localization of gravity than the Randall-Sundrum
model.
| [
{
"created": "Mon, 20 Dec 2004 04:50:03 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2005 04:01:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pospelov",
"Maxim",
""
]
] | We present several solutions for the five dimensional gravity models in the presence of bulk ghosts and tachyons to argue that these "troublesome" fields can be a useful model-building tool. The ghost-like signature of the kinetic term for a bulk scalar creates a minimum in the scale factor, removing the necessity for a negative tension brane in models with the compactified fifth dimension. It is shown that the model with the positive tension branes and a ghost field in the bulk leads to the radion stabilization. The bulk scalar with the variable sign kinetic term can be used to model both positive and negative tension branes of a finite width in the compact dimension. Finally, we present several ghost and tachyon field configurations in the bulk that lead to the localization of gravity in four dimensions, including one solution with the Gaussian profile for the metric, g_{\mu\nu}(y)=\eta_{\mu\nu}\exp{-\alpha y^2}, which leads to a stronger localization of gravity than the Randall-Sundrum model. |
hep-ph/9502348 | Kataev | A.L.Kataev and V.V. Starshenko | Estimates of the higher-order QCD corrections to R(s), R_{\tau} and
deep-inelasstic scattering sum rules | LATEX, 17 pages; to be published in Mod.Phys.Lett.A10,N3 (1995) 235 | Mod.Phys.Lett. A10 (1995) 235-250 | 10.1142/S0217732395000272 | null | hep-ph | null | We present the attempt to study the problem of the estimates of higher-order
perturbative corrections to physical quantities in the Euclidean region. Our
considerations are based on the application of the scheme-invariant methods,
namely the principle of minimal sensitivity and the effective charges approach.
We emphasize, that in order to obtain the concrete results for the physical
quantities in the Minkowskian region the results of application of this
formalism should be supplemented by the explicite calculations of the effects
of the analytical continuation. We present the estimates of the order
$O(\alpha^{4}_{s})$ QCD corrections to the Euclidean quantities: the
$e^+e^-$-annihilation $D$-function and the deep inelastic scattering sum rules,
namely the non-polarized and polarized Bjorken sum rules and to the
Gross--Llewellyn Smith sum rule. The results for the $D$-function are further
applied to estimate the $O(\alpha_s^4)$ QCD corrections to the Minkowskian
quantities $R(s) = \sigma_{tot} (e^{+}e^{-} \to {\rm hadrons}) /
\sigma (e^{+}e^{-} \to \mu^{+} \mu^{-})$ and $R_{\tau} =
\Gamma (\tau \to \nu_{\tau} + {\rm hadrons}) /
\Gamma (\tau \to \nu_{\tau} \overline{\nu}_{e} e)$. The problem of the
fixation of the uncertainties due to the $O(\alpha_s^5)$ corrections to the
considered quantities is also discussed.
| [
{
"created": "Mon, 20 Feb 1995 11:48:48 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kataev",
"A. L.",
""
],
[
"Starshenko",
"V. V.",
""
]
] | We present the attempt to study the problem of the estimates of higher-order perturbative corrections to physical quantities in the Euclidean region. Our considerations are based on the application of the scheme-invariant methods, namely the principle of minimal sensitivity and the effective charges approach. We emphasize, that in order to obtain the concrete results for the physical quantities in the Minkowskian region the results of application of this formalism should be supplemented by the explicite calculations of the effects of the analytical continuation. We present the estimates of the order $O(\alpha^{4}_{s})$ QCD corrections to the Euclidean quantities: the $e^+e^-$-annihilation $D$-function and the deep inelastic scattering sum rules, namely the non-polarized and polarized Bjorken sum rules and to the Gross--Llewellyn Smith sum rule. The results for the $D$-function are further applied to estimate the $O(\alpha_s^4)$ QCD corrections to the Minkowskian quantities $R(s) = \sigma_{tot} (e^{+}e^{-} \to {\rm hadrons}) / \sigma (e^{+}e^{-} \to \mu^{+} \mu^{-})$ and $R_{\tau} = \Gamma (\tau \to \nu_{\tau} + {\rm hadrons}) / \Gamma (\tau \to \nu_{\tau} \overline{\nu}_{e} e)$. The problem of the fixation of the uncertainties due to the $O(\alpha_s^5)$ corrections to the considered quantities is also discussed. |
2111.03677 | Basabendu Barman | Basabendu Barman, Nicol\'as Bernal, Nicklas Ramberg, Luca Visinelli | QCD Axion Kinetic Misalignment without Prejudice | 24 pages, 6 figures, 1 table, version accpeted for publication in
Universe | Universe 8(12), 634 (2022) | 10.3390/universe8120634 | PI/UAN-2021-703FT, MITP-21-057 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The axion field, the angular direction of the complex scalar field associated
with the spontaneous symmetry breaking of the Peccei-Quinn (PQ) symmetry, could
have originated with initial non-zero velocity. The presence of a non-zero
angular velocity resulting from additional terms in the potential that
explicitly break the PQ symmetry has important phenomenological consequences
such as a modification of the axion mass with respect to the conventional PQ
framework or an explanation for the observed matter-antimatter asymmetry. We
elaborate further on the consequences of the "kinetic misalignment" mechanism,
assuming that axions form the entirety of the dark matter abundance. The
kinetic misalignment mechanism possesses a {\it weak} limit in which the axion
field starts to oscillate at the same temperature as in the conventional PQ
framework, and a {\it strong} limit corresponding to large initial velocities
which effectively delay the onset of oscillations. Following a UV-agnostic
approach, we show how this scenario impacts the formation of axion
miniclusters, and we sketch the details of these substructures along with
potential detecting signatures.
| [
{
"created": "Fri, 5 Nov 2021 18:00:13 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2022 17:01:59 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Barman",
"Basabendu",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Ramberg",
"Nicklas",
""
],
[
"Visinelli",
"Luca",
""
]
] | The axion field, the angular direction of the complex scalar field associated with the spontaneous symmetry breaking of the Peccei-Quinn (PQ) symmetry, could have originated with initial non-zero velocity. The presence of a non-zero angular velocity resulting from additional terms in the potential that explicitly break the PQ symmetry has important phenomenological consequences such as a modification of the axion mass with respect to the conventional PQ framework or an explanation for the observed matter-antimatter asymmetry. We elaborate further on the consequences of the "kinetic misalignment" mechanism, assuming that axions form the entirety of the dark matter abundance. The kinetic misalignment mechanism possesses a {\it weak} limit in which the axion field starts to oscillate at the same temperature as in the conventional PQ framework, and a {\it strong} limit corresponding to large initial velocities which effectively delay the onset of oscillations. Following a UV-agnostic approach, we show how this scenario impacts the formation of axion miniclusters, and we sketch the details of these substructures along with potential detecting signatures. |
0912.1163 | Xin Liu | Xin Liu, Zhen-Jun xiao and Cai-Dian Lu | The pure annihilation type B_c to M_2 M_3 decays in the perturbative QCD
approach | 22 pages, 1 figure | Phys.Rev.D81:014022,2010 | 10.1103/PhysRevD.81.014022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the standard model the two-body charmless hadronic $B_c$ meson decays can
occur via annihilation diagrams only. In this work, we studied the $B_c \to PP,
PV/VP,VV$ decays by employing the perturbative QCD (pQCD) factorization
approach. From our calculations, we find that (a) the pQCD predictions for the
branching ratios of the considered $B_c$ decays are in the range of $10^{-6}$
to $10^{-8}$; (b) for $B_c \to PV/VP, VV$ decays, the branching ratios of
$\Delta S= 0$ decays are much larger than those of $\Delta S =1$ ones because
the different Cabibbo-Kobayashi-Maskawa(CKM) factors are involved; (c)
analogous to $B \to K \eta^{(\prime)}$ decays, we find $Br(B_c \to K^+
\eta^\prime) \sim 10 \times Br(B_c \to K^+ \eta)$, which can be understood by
the destructive and constructive interference between the $\eta_q$ and $\eta_s$
contribution to the $B_c \to K^+ \eta$ and $B_c \to K^+ \eta^\prime$ decay; (d)
the longitudinal polarization fractions of $B_c \to VV$ decays are in the range
of $86%-95%$ and play the dominant role; and (e) there is no CP-violating
asymmetries for the considered $B_c$ decays because only one type tree
operators involved.
| [
{
"created": "Mon, 7 Dec 2009 04:38:10 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Liu",
"Xin",
""
],
[
"xiao",
"Zhen-Jun",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | In the standard model the two-body charmless hadronic $B_c$ meson decays can occur via annihilation diagrams only. In this work, we studied the $B_c \to PP, PV/VP,VV$ decays by employing the perturbative QCD (pQCD) factorization approach. From our calculations, we find that (a) the pQCD predictions for the branching ratios of the considered $B_c$ decays are in the range of $10^{-6}$ to $10^{-8}$; (b) for $B_c \to PV/VP, VV$ decays, the branching ratios of $\Delta S= 0$ decays are much larger than those of $\Delta S =1$ ones because the different Cabibbo-Kobayashi-Maskawa(CKM) factors are involved; (c) analogous to $B \to K \eta^{(\prime)}$ decays, we find $Br(B_c \to K^+ \eta^\prime) \sim 10 \times Br(B_c \to K^+ \eta)$, which can be understood by the destructive and constructive interference between the $\eta_q$ and $\eta_s$ contribution to the $B_c \to K^+ \eta$ and $B_c \to K^+ \eta^\prime$ decay; (d) the longitudinal polarization fractions of $B_c \to VV$ decays are in the range of $86%-95%$ and play the dominant role; and (e) there is no CP-violating asymmetries for the considered $B_c$ decays because only one type tree operators involved. |
hep-ph/0610315 | Robert Kaminski | R. Kaminski, J. R. Pelaez, F. J. Yndurain | Forward dispersion relations and Roy equations in pi-pi scattering | 6 pages, invited talk to the IV International Conference on Quarks
and Nuclear Physics QNP06, Madrid 5th-10th June 2006 | Eur.Phys.J.A31:479-484,2007 | 10.1140/epja/i2007-10006-6 | null | hep-ph | null | We review results of an analysis of pipi interactions in S, P and D waves for
two-pion effective mass from threshold to about 1.4 GeV. In particular we show
a recent improvement of this analysis above the K anti-K threshold using more
data for phase shifts and including the S0 wave inelasticity from pipi -> K
anti-K. In addition, we have improved the fit to the f2(1270) resonance and
used a more flexible P wave parametrization above the K anti-K threshold and
included an estimation of the D2 wave inelasticity. The better accuracy thus
achieved also required a refinement of the Regge analysis above 1.42 GeV. We
have checked that the pipi scattering amplitudes obtained in this approach
satisfy remarkably well forward dispersion relations and Roy's equations.
| [
{
"created": "Tue, 24 Oct 2006 15:44:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kaminski",
"R.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Yndurain",
"F. J.",
""
]
] | We review results of an analysis of pipi interactions in S, P and D waves for two-pion effective mass from threshold to about 1.4 GeV. In particular we show a recent improvement of this analysis above the K anti-K threshold using more data for phase shifts and including the S0 wave inelasticity from pipi -> K anti-K. In addition, we have improved the fit to the f2(1270) resonance and used a more flexible P wave parametrization above the K anti-K threshold and included an estimation of the D2 wave inelasticity. The better accuracy thus achieved also required a refinement of the Regge analysis above 1.42 GeV. We have checked that the pipi scattering amplitudes obtained in this approach satisfy remarkably well forward dispersion relations and Roy's equations. |
0810.2874 | Michael Wick | Michael Wick, Wolfgang Altmannshofer | A Reconsideration of the b -> s gamma Decay in the Minimal Flavor
Violating MSSM | 4 pages, 3 figures, based on a talk given by M.Wick at SUSY08, Seoul,
Korea} | AIP Conf.Proc.1078:348-353,2009 | 10.1063/1.3051956 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a MSSM study of the b -> s gamma decay in a Minimal Flavor
Violating (MFV) framework, where the form of the soft SUSY breaking terms is
determined by the Standard Model Yukawa couplings. In particular, we address
the role of gluino contributions, which are set to zero in most studies of the
MFV MSSM.
Gluino contributions can play an important role in the MFV MSSM whenever mu *
tan(beta) is large. In fact, similarly to chargino contributions, gluino
contributions are tan(beta) enhanced and can easily dominate charged Higgs
contributions for large values of tan(beta). Even though each of the separate
contributions to b -> s gamma can be sizeable by itself, surprisingly no
absolute lower bound can be placed on any of the relevant SUSY masses, since
patterns of partial cancellations among the three competing contributions
(Higgs, chargino and gluino) can occur throughout the MSSM parameter space.
| [
{
"created": "Thu, 16 Oct 2008 09:21:52 GMT",
"version": "v1"
}
] | 2009-02-02 | [
[
"Wick",
"Michael",
""
],
[
"Altmannshofer",
"Wolfgang",
""
]
] | We present a MSSM study of the b -> s gamma decay in a Minimal Flavor Violating (MFV) framework, where the form of the soft SUSY breaking terms is determined by the Standard Model Yukawa couplings. In particular, we address the role of gluino contributions, which are set to zero in most studies of the MFV MSSM. Gluino contributions can play an important role in the MFV MSSM whenever mu * tan(beta) is large. In fact, similarly to chargino contributions, gluino contributions are tan(beta) enhanced and can easily dominate charged Higgs contributions for large values of tan(beta). Even though each of the separate contributions to b -> s gamma can be sizeable by itself, surprisingly no absolute lower bound can be placed on any of the relevant SUSY masses, since patterns of partial cancellations among the three competing contributions (Higgs, chargino and gluino) can occur throughout the MSSM parameter space. |
hep-ph/0106210 | Osamu Yasuda | John Pinney | Correlations of errors in a CP-violation neutrino factory experiment | 4 pages, uses elsart.cls & epsfig, 2 figures, talk at the NUFACT'01
Workshop in Tsukuba, Japan, 24-30 May 2001 | Nucl.Instrum.Meth.A503:205-207,2001 | 10.1016/S0168-9002(03)00674-0 | null | hep-ph | null | An indirect CP-violation neutrino factory experiment is studied, including
simul taneous correlations of errors of the six oscillation parameters and a
matter ef fect normalisation parameter, C. It is found that for larger values
of $\theta_{13}$ ($3^\circ$), an uncertainty on the matter effect of the order
5% means t hat the optimal baseline for measurement of $\delta$ is reduced from
3000km to 2 000km. When the background fraction is assumed to be $10^{-3}$ the
optimal muon energy is also reduced from 50GeV to around 20GeV. An experiment
with L=2000km, $E_\mu=$20GeV is found to be sensitive to non-zero $\delta$ down
to around $\t heta_{13}\approx0.3^\circ$.
| [
{
"created": "Tue, 19 Jun 2001 07:58:47 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Pinney",
"John",
""
]
] | An indirect CP-violation neutrino factory experiment is studied, including simul taneous correlations of errors of the six oscillation parameters and a matter ef fect normalisation parameter, C. It is found that for larger values of $\theta_{13}$ ($3^\circ$), an uncertainty on the matter effect of the order 5% means t hat the optimal baseline for measurement of $\delta$ is reduced from 3000km to 2 000km. When the background fraction is assumed to be $10^{-3}$ the optimal muon energy is also reduced from 50GeV to around 20GeV. An experiment with L=2000km, $E_\mu=$20GeV is found to be sensitive to non-zero $\delta$ down to around $\t heta_{13}\approx0.3^\circ$. |
2103.11984 | Heinrich P\"as | Dominik Hellmann, Heinrich P\"as, Erika Rani | Searching New Particles at Neutrino Telescopes with
Quantum-Gravitational Decoherence | 25 pages, 4 figures, version to be published in Physical Review D | null | 10.1103/PhysRevD.105.055007 | DO-TH 21/10 | hep-ph astro-ph.HE gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the interplay of wave packet decoherence and decoherence induced
by quantum gravity via interactions with spacetime foam for high energy
astrophysical neutrinos. In this context we point out a compelling consequence
of the expectation that quantum gravity should break global symmetries, namely
that quantum-gravity induced decoherence may not only be the most sensitive
probe for quantum properties of spacetime, but also can provide both a powerful
tool for the search for new particles, including totally decoupled backgrounds
interacting only gravitationally, and at the same time a window into the
intricacies of black hole information processing.
| [
{
"created": "Mon, 22 Mar 2021 16:33:18 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2022 14:40:57 GMT",
"version": "v2"
}
] | 2022-03-23 | [
[
"Hellmann",
"Dominik",
""
],
[
"Päs",
"Heinrich",
""
],
[
"Rani",
"Erika",
""
]
] | We discuss the interplay of wave packet decoherence and decoherence induced by quantum gravity via interactions with spacetime foam for high energy astrophysical neutrinos. In this context we point out a compelling consequence of the expectation that quantum gravity should break global symmetries, namely that quantum-gravity induced decoherence may not only be the most sensitive probe for quantum properties of spacetime, but also can provide both a powerful tool for the search for new particles, including totally decoupled backgrounds interacting only gravitationally, and at the same time a window into the intricacies of black hole information processing. |
2202.12648 | Chih-Ting Lu | P. Ko, Chih-Ting Lu, Ui Min | Crossing two-component dark matter models and implications for 511 keV
$\gamma$-ray and XENON1T excesses | 41 pages, 12 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We study scalar and fermionic crossing two-component dark matter (C2CDM)
models with $ U(1)_X $ dark gauge symmetry. This $ U(1)_X $ gauge symmetry is
broken via the dark Higgs mechanism of a dark Higgs field $\Phi$ and the dark
photon becomes massive. On the other hand, the same dark Higgs field $\Phi$
also serves as a bridge between each component of two DM sectors such that the
dark flavor-changing neutral current (DFCNC) interaction between them is
induced. Moreover, the mass splitting between these two DM sectors is generated
after $ U(1)_X $ gauge symmetry breaking by nonzero $\langle \Phi \rangle$. We
discuss the stability of DM candidates and allowed parameter space from the
relic density and other constraints in C2CDM models. Some novel signatures with
displaced vertices at Belle II are studied. Finally, the possible explanations
of 511 keV $\gamma$-ray line and XENON1T excess in C2CDM models are discussed.
| [
{
"created": "Fri, 25 Feb 2022 12:13:16 GMT",
"version": "v1"
}
] | 2022-02-28 | [
[
"Ko",
"P.",
""
],
[
"Lu",
"Chih-Ting",
""
],
[
"Min",
"Ui",
""
]
] | We study scalar and fermionic crossing two-component dark matter (C2CDM) models with $ U(1)_X $ dark gauge symmetry. This $ U(1)_X $ gauge symmetry is broken via the dark Higgs mechanism of a dark Higgs field $\Phi$ and the dark photon becomes massive. On the other hand, the same dark Higgs field $\Phi$ also serves as a bridge between each component of two DM sectors such that the dark flavor-changing neutral current (DFCNC) interaction between them is induced. Moreover, the mass splitting between these two DM sectors is generated after $ U(1)_X $ gauge symmetry breaking by nonzero $\langle \Phi \rangle$. We discuss the stability of DM candidates and allowed parameter space from the relic density and other constraints in C2CDM models. Some novel signatures with displaced vertices at Belle II are studied. Finally, the possible explanations of 511 keV $\gamma$-ray line and XENON1T excess in C2CDM models are discussed. |
hep-ph/0510262 | Fulvia de Fazio | F. De Fazio, Th. Feldmann, T. Hurth | Light-cone sum rules: A SCET-based formulation | LaTex, 4 pages, 2 eps figures. Talk given at QCD05, 12th
International QCD Conference, 4-9th July 2005, Montpellier, France | null | null | BARI-TH/05-522; SI-HEP-2005-13; CERN-PH-TH/2005-202; SLAC-PUB-11529 | hep-ph | null | We describe the construction of light-cone sum rules (LCSRs) for exclusive
$B$-meson decays into light energetic hadrons from correlation functions within
soft-collinear effective theory (SCET). As an example, we consider the SCET sum
rule for the $B \to \pi$ transition form factor at large recoil, including
radiative corrections from hard-collinear loop diagrams at first order in the
strong coupling constant.
| [
{
"created": "Thu, 20 Oct 2005 09:52:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"De Fazio",
"F.",
""
],
[
"Feldmann",
"Th.",
""
],
[
"Hurth",
"T.",
""
]
] | We describe the construction of light-cone sum rules (LCSRs) for exclusive $B$-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory (SCET). As an example, we consider the SCET sum rule for the $B \to \pi$ transition form factor at large recoil, including radiative corrections from hard-collinear loop diagrams at first order in the strong coupling constant. |
1111.2691 | Yasumiro Yamaguchi | Yasuhiro Yamaguchi, Shunsuke Ohkoda, Shigehiro Yasui, and Atsushi
Hosaka | Exotic baryons from a heavy meson and a nucleon - Positive parity states
- | null | Phys. Rev. D 85, 054003 (2012) | 10.1103/PhysRevD.85.054003 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study heavy baryons with exotic flavor quantum numbers formed by a heavy
meson and a nucleon (DbarN and BN) with positive parity. One pion exchange
interaction, providing a tensor force, dominates as a long range force to bind
the DbarN and BN ystems. In the heavy quark mass limit, pseudoscalar meson and
vector meson are degenerate and the binding mechanism by the tensor force
analogous to that in the nuclear systems becomes important. As a result, we
obtain the DbarN and BN resonant states in the J^P=1/2^+, 3/2^+ and 5/2^+
channels with I=0.
| [
{
"created": "Fri, 11 Nov 2011 09:46:54 GMT",
"version": "v1"
}
] | 2019-08-08 | [
[
"Yamaguchi",
"Yasuhiro",
""
],
[
"Ohkoda",
"Shunsuke",
""
],
[
"Yasui",
"Shigehiro",
""
],
[
"Hosaka",
"Atsushi",
""
]
] | We study heavy baryons with exotic flavor quantum numbers formed by a heavy meson and a nucleon (DbarN and BN) with positive parity. One pion exchange interaction, providing a tensor force, dominates as a long range force to bind the DbarN and BN ystems. In the heavy quark mass limit, pseudoscalar meson and vector meson are degenerate and the binding mechanism by the tensor force analogous to that in the nuclear systems becomes important. As a result, we obtain the DbarN and BN resonant states in the J^P=1/2^+, 3/2^+ and 5/2^+ channels with I=0. |
hep-ph/0701186 | Gilad Perez | Kaustubh Agashe, Hooman Davoudiasl, Gilad Perez and Amarjit Soni | Warped Gravitons at the LHC and Beyond | 9 pages, 5 figures. Minor modifications, reference added | Phys.Rev.D76:036006,2007 | 10.1103/PhysRevD.76.036006 | SU-4252-843, BNL-HET-07/3, YITP-SB-07-02 | hep-ph | null | We study the production and decay of Kaluza-Klein (KK) gravitons at the Large
Hadron Collider (LHC), in the framework of a warped extra dimension in which
the Standard Model (SM) fields propagate. Such a scenario can provide solutions
to both the Planck-weak hierarchy problem and the flavor puzzle of the SM. In
this scenario, the production via $q \bar{q}$ annihilation and decays to the
conventional photon and lepton channels are highly suppressed. However, we show
that graviton production via gluon fusion followed by decay to longitudinal
$Z/W$ can be significant; vector boson fusion is found to be a sub-dominant
production mode. In particular, the ``golden'' $ZZ$ decay mode offers a
distinctive 4-lepton signal that could lead to the observation at the LHC with
300 fb$^{-1}$ (SLHC with 3 ab$^{-1}$) of a KK graviton with a mass up to $\sim
2$ ($\sim 3$) TeV for the ratio of the AdS$_5$ curvature to the Planck scale
modestly above unity. We argue that (contrary to the lore) such a size of the
curvature scale can still be within the regime of validity of the framework.
Upgrades beyond the SLHC luminosity are required to discover gravitons heavier
than $\sim 4$ TeV, as favored by the electroweak and flavor precision tests in
the simplest such models.
| [
{
"created": "Mon, 22 Jan 2007 20:47:28 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Apr 2007 23:17:53 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jul 2007 21:59:30 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Davoudiasl",
"Hooman",
""
],
[
"Perez",
"Gilad",
""
],
[
"Soni",
"Amarjit",
""
]
] | We study the production and decay of Kaluza-Klein (KK) gravitons at the Large Hadron Collider (LHC), in the framework of a warped extra dimension in which the Standard Model (SM) fields propagate. Such a scenario can provide solutions to both the Planck-weak hierarchy problem and the flavor puzzle of the SM. In this scenario, the production via $q \bar{q}$ annihilation and decays to the conventional photon and lepton channels are highly suppressed. However, we show that graviton production via gluon fusion followed by decay to longitudinal $Z/W$ can be significant; vector boson fusion is found to be a sub-dominant production mode. In particular, the ``golden'' $ZZ$ decay mode offers a distinctive 4-lepton signal that could lead to the observation at the LHC with 300 fb$^{-1}$ (SLHC with 3 ab$^{-1}$) of a KK graviton with a mass up to $\sim 2$ ($\sim 3$) TeV for the ratio of the AdS$_5$ curvature to the Planck scale modestly above unity. We argue that (contrary to the lore) such a size of the curvature scale can still be within the regime of validity of the framework. Upgrades beyond the SLHC luminosity are required to discover gravitons heavier than $\sim 4$ TeV, as favored by the electroweak and flavor precision tests in the simplest such models. |
hep-ph/0504104 | Gerhart Seidl | T. Enkhbat (Oklahoma State University) and G. Seidl (Oklahoma State
University) | Quark and Lepton Masses from Deconstruction | 22 pages, 2 figures, typos in neutrino mass squared differences
corrected | Nucl.Phys. B730 (2005) 223-238 | 10.1016/j.nuclphysb.2005.10.002 | OSU-HEP-05-06 | hep-ph | null | We propose a supersymmetric SU(5)xSU(5) model, where the quarks and leptons
live in a U(1) product group theory space that is compactified on the real
projective plane RP^2. The fermion generations are placed on different points
in the deconstructed manifold by assigning them SO(10) compatible U(1) charges.
The observed masses and mixing angles of quarks and leptons emerge from
non-renormalizable operators involving the chiral link fields. The link fields
introduce a large atmospheric neutrino mixing angle \theta_23 via a dynamical
realization of the seesaw mechanism, which sets the deconstruction scale to a
value of the order the B-L breaking scale 10^14 GeV. Supersymmetry breaking can
be achieved through topological effects due to a non-trivial homology group
Z_2. The mixed anomalies of the link fields are canceled by Wess-Zumino terms,
which are local polynomials in the gauge and link fields only. We also comment
on the construction of Chern-Simons couplings from these fields.
| [
{
"created": "Thu, 14 Apr 2005 05:32:51 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2005 22:27:05 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Oct 2005 17:52:57 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Sep 2007 11:02:54 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Enkhbat",
"T.",
"",
"Oklahoma State University"
],
[
"Seidl",
"G.",
"",
"Oklahoma State\n University"
]
] | We propose a supersymmetric SU(5)xSU(5) model, where the quarks and leptons live in a U(1) product group theory space that is compactified on the real projective plane RP^2. The fermion generations are placed on different points in the deconstructed manifold by assigning them SO(10) compatible U(1) charges. The observed masses and mixing angles of quarks and leptons emerge from non-renormalizable operators involving the chiral link fields. The link fields introduce a large atmospheric neutrino mixing angle \theta_23 via a dynamical realization of the seesaw mechanism, which sets the deconstruction scale to a value of the order the B-L breaking scale 10^14 GeV. Supersymmetry breaking can be achieved through topological effects due to a non-trivial homology group Z_2. The mixed anomalies of the link fields are canceled by Wess-Zumino terms, which are local polynomials in the gauge and link fields only. We also comment on the construction of Chern-Simons couplings from these fields. |
0706.1100 | Shao-Long Chen | Shao-Long Chen, Xiao-Gang He, A. Hovhannisyan and Ho-Chin Tsai | SUSY R-parity violating contributions to the width differences for
$D-\bar{D}$ and $B_{d,s}-\bar B_{d,s}$ systems | 19 pages, 1 figure. submitted to JHEP | JHEP 0709:044,2007 | 10.1088/1126-6708/2007/09/044 | null | hep-ph | null | We study R-parity violating contributions to the mixing parameter $y$ for
$D^0 -\bar D^0$ and $B^0_{d,s} - \bar B^0_{d,s}$ systems. We first obtain
general expressions for new physics contributions to $y$ from effective four
fermion operators. We then use them to study R-parity contributions. We find
that R-parity violating contributions to $D^0 - \bar D^0$ mixing, and $B_{d}^0
- \bar B_{d}^0$ to be small. There may be sizable contribution to $B_s^0 -\bar
B_s^0$ mixing. We also obtain some interesting bounds on R-parity violating
parameters using known Standard Model predictions and experimental data.
| [
{
"created": "Fri, 8 Jun 2007 05:47:06 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2007 09:05:58 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Aug 2007 03:41:06 GMT",
"version": "v3"
},
{
"created": "Thu, 30 Aug 2007 08:27:00 GMT",
"version": "v4"
}
] | 2009-01-06 | [
[
"Chen",
"Shao-Long",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Hovhannisyan",
"A.",
""
],
[
"Tsai",
"Ho-Chin",
""
]
] | We study R-parity violating contributions to the mixing parameter $y$ for $D^0 -\bar D^0$ and $B^0_{d,s} - \bar B^0_{d,s}$ systems. We first obtain general expressions for new physics contributions to $y$ from effective four fermion operators. We then use them to study R-parity contributions. We find that R-parity violating contributions to $D^0 - \bar D^0$ mixing, and $B_{d}^0 - \bar B_{d}^0$ to be small. There may be sizable contribution to $B_s^0 -\bar B_s^0$ mixing. We also obtain some interesting bounds on R-parity violating parameters using known Standard Model predictions and experimental data. |
1507.06660 | Susanne Westhoff | Genevi\`eve B\'elanger, C\'edric Delaunay, and Susanne Westhoff | A Dark Matter Relic From Muon Anomalies | 10 pages, 7 figures, 1 table | Phys. Rev. D 92, 055021 (2015) | 10.1103/PhysRevD.92.055021 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the recently reported anomalies in $b\to s\mu^+\mu^-$
transitions, as well as the long-standing $g_\mu-2$ discrepancy, can be
addressed simultaneously by a new massive abelian gauge boson with loop-induced
coupling to muons. Such a scenario typically leads to a stable dark matter
candidate with a thermal relic density close to the observed value. Dark matter
in our model couples dominantly to leptons, hence signals in direct detection
experiments lie well below the current sensitivity. The LHC, in combination
with indirect detection searches, can test this scenario through distinctive
signatures with muon pairs and missing energy.
| [
{
"created": "Thu, 23 Jul 2015 20:03:05 GMT",
"version": "v1"
}
] | 2015-09-23 | [
[
"Bélanger",
"Geneviève",
""
],
[
"Delaunay",
"Cédric",
""
],
[
"Westhoff",
"Susanne",
""
]
] | We show that the recently reported anomalies in $b\to s\mu^+\mu^-$ transitions, as well as the long-standing $g_\mu-2$ discrepancy, can be addressed simultaneously by a new massive abelian gauge boson with loop-induced coupling to muons. Such a scenario typically leads to a stable dark matter candidate with a thermal relic density close to the observed value. Dark matter in our model couples dominantly to leptons, hence signals in direct detection experiments lie well below the current sensitivity. The LHC, in combination with indirect detection searches, can test this scenario through distinctive signatures with muon pairs and missing energy. |
hep-ph/9510282 | null | Yu.S.Kalashnikova, A.V.Nefediev (ITEP) | String junction as a baryonic constituent | Latex,7 pages,no figures | Phys.Lett. B367 (1996) 265-269 | 10.1016/0370-2693(95)01421-7 | ITEP-52-95 | hep-ph | null | We extend the model for QCD string with quarks to consider the Mercedes Benz
string configuration describing the three-quark baryon. Under the assumption of
adiabatic separation of quark and string junction motion we formulate and solve
the classical equation of motion for the junction.We dare to quantize the
motion of the junction, and discuss the impact of these modes on the baryon
spectra.
| [
{
"created": "Thu, 12 Oct 1995 12:10:51 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Kalashnikova",
"Yu. S.",
"",
"ITEP"
],
[
"Nefediev",
"A. V.",
"",
"ITEP"
]
] | We extend the model for QCD string with quarks to consider the Mercedes Benz string configuration describing the three-quark baryon. Under the assumption of adiabatic separation of quark and string junction motion we formulate and solve the classical equation of motion for the junction.We dare to quantize the motion of the junction, and discuss the impact of these modes on the baryon spectra. |
hep-ph/0105312 | Mikolaj Misiak | Mikolaj Misiak | Radiative B Decay in the SM | Contribution to the proceedings of the XXXVIth Rencontres de Moriond,
Les Arcs, March 2001. 4 pages, 2 figures, uses epsfig | null | null | null | hep-ph | null | The experimental and theoretical status of the inclusive decay B -> X_s gamma
is briefly summarized. Results from a very recent theoretical analysis are
reported. An ~11% increase in the SM prediction for BR[ B -> X_s gamma] is
found after replacing m_c^pole/m_b^pole by m_c(mu)/m_b^1S in the NLO QCD
correction. The well-known enhancement of the branching ratio by QCD logarithms
is identified as an effect of m_b-evolution in the top-quark contribution to
the amplitude. This observation helps controlling the residual
scale-dependence. The present prediction for the "total" branching ratio
differs by 1.4 sigma from the experimental world average.
| [
{
"created": "Tue, 29 May 2001 21:23:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Misiak",
"Mikolaj",
""
]
] | The experimental and theoretical status of the inclusive decay B -> X_s gamma is briefly summarized. Results from a very recent theoretical analysis are reported. An ~11% increase in the SM prediction for BR[ B -> X_s gamma] is found after replacing m_c^pole/m_b^pole by m_c(mu)/m_b^1S in the NLO QCD correction. The well-known enhancement of the branching ratio by QCD logarithms is identified as an effect of m_b-evolution in the top-quark contribution to the amplitude. This observation helps controlling the residual scale-dependence. The present prediction for the "total" branching ratio differs by 1.4 sigma from the experimental world average. |
hep-ph/0510279 | Tomoki Endo | Tomoki Endo, Toshiki Maruyama, Satoshi Chiba and Toshitaka Tatsumi | Charge screening effect in the hadron-quark mixed phase | 16 pages, 12 figures | Prog.Theor.Phys. 115 (2006) 337-353 | 10.1143/PTP.115.337 | null | hep-ph nucl-th | null | The Coulomb interaction effect and the surface effect are consistently taken
into account in the hadron-quark mixed phase. These two finite-size effects
greatly change the properties of the mixed phase and restrict its density
region. In particular, the charge screening effect and the rearrangement of the
charged particles are elucidated. Keeping the Gibbs conditions throughout the
numerical procedure, we show the Maxwell construction effectively regain the
physical meaning and the equation of state becomes similar to that given by the
Maxwell construction.
| [
{
"created": "Fri, 21 Oct 2005 08:38:43 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Oct 2005 06:16:50 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Endo",
"Tomoki",
""
],
[
"Maruyama",
"Toshiki",
""
],
[
"Chiba",
"Satoshi",
""
],
[
"Tatsumi",
"Toshitaka",
""
]
] | The Coulomb interaction effect and the surface effect are consistently taken into account in the hadron-quark mixed phase. These two finite-size effects greatly change the properties of the mixed phase and restrict its density region. In particular, the charge screening effect and the rearrangement of the charged particles are elucidated. Keeping the Gibbs conditions throughout the numerical procedure, we show the Maxwell construction effectively regain the physical meaning and the equation of state becomes similar to that given by the Maxwell construction. |
0904.4599 | Raphael Tumanyan V. | Rafael Tumanyan | Harmonic potential and hadron spectroscopy | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quark-gluon sea in the hadrons is considered as periodically correlated.
Energy levels of Shrodinger equation with harmonic potential is used for
describing of the spectrum of hadron masses. In the considered cases the
effective potential operating on each particle of ensemble, under certain
conditions becomes square-law on displacement from a equilibrium point. It can
become an explanation of popularity of oscillator potential for the description
of a spectrum of masses of elementary particles. The analysis shows that levels
of periodic potential better agreed to the spectrum of hadron masses, than
levels of other potentials used for an explanation of a spectrum of masses.
| [
{
"created": "Wed, 29 Apr 2009 12:47:12 GMT",
"version": "v1"
},
{
"created": "Thu, 28 May 2009 16:46:01 GMT",
"version": "v2"
}
] | 2009-05-28 | [
[
"Tumanyan",
"Rafael",
""
]
] | The quark-gluon sea in the hadrons is considered as periodically correlated. Energy levels of Shrodinger equation with harmonic potential is used for describing of the spectrum of hadron masses. In the considered cases the effective potential operating on each particle of ensemble, under certain conditions becomes square-law on displacement from a equilibrium point. It can become an explanation of popularity of oscillator potential for the description of a spectrum of masses of elementary particles. The analysis shows that levels of periodic potential better agreed to the spectrum of hadron masses, than levels of other potentials used for an explanation of a spectrum of masses. |
0709.2865 | Michael C. Birse | Michael C. Birse (Manchester) | Renormalisation in Quantum Mechanics | 9 pages, 4 eps figures; contribution to the Bled 2007 Workshop
"Hadron structure and lattice QCD" | null | null | null | hep-ph nucl-th quant-ph | null | This lecture provides an introduction to the renormalisation group as applied
to scattering of two nonrelativistic particles. As well as forming a framework
for constructing effective theories of few-nucleon systems, these ideas also
provide a simple example which illustrates general features of the
renormalisation group.
| [
{
"created": "Tue, 18 Sep 2007 16:12:11 GMT",
"version": "v1"
}
] | 2007-09-20 | [
[
"Birse",
"Michael C.",
"",
"Manchester"
]
] | This lecture provides an introduction to the renormalisation group as applied to scattering of two nonrelativistic particles. As well as forming a framework for constructing effective theories of few-nucleon systems, these ideas also provide a simple example which illustrates general features of the renormalisation group. |
0707.3561 | Krzysztof M. Graczyk | K. M. Graczyk, J. T. Sobczyk | Form Factors in the Quark Resonance Model | 15 pages, 4 figures, 3 tables | Phys.Rev.D77:053001,2008; Erratum-ibid.D79:079903,2009 | 10.1103/PhysRevD.77.053001 10.1103/PhysRevD.79.079903 | null | hep-ph | null | Vector and axial form factors in the quark resonance model are analyzed with
a combination of theoretical and phenomenological arguments. The new form of
form factors is deduced from $\Delta$(1232) excitation models and available
data. The vector part is shown to agree with the resonant contribution to
electron-proton inclusive $F_2$ data. The axial part is obtained by finding a
simultaneous fit to ANL and BNL $\frac{d \sigma}{d Q^2}$ neutrino scattering
data. The best fit corresponds to $C_5^A(0)=0.88$ in the Rarita Schwinger
formalism.
| [
{
"created": "Tue, 24 Jul 2007 15:05:58 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2008 14:37:28 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Graczyk",
"K. M.",
""
],
[
"Sobczyk",
"J. T.",
""
]
] | Vector and axial form factors in the quark resonance model are analyzed with a combination of theoretical and phenomenological arguments. The new form of form factors is deduced from $\Delta$(1232) excitation models and available data. The vector part is shown to agree with the resonant contribution to electron-proton inclusive $F_2$ data. The axial part is obtained by finding a simultaneous fit to ANL and BNL $\frac{d \sigma}{d Q^2}$ neutrino scattering data. The best fit corresponds to $C_5^A(0)=0.88$ in the Rarita Schwinger formalism. |
0708.0172 | Bo-Qiang Ma | Jianghao Yu, Teng Wang, Chueng-Ryong Ji, Bo-Qiang Ma | Zero-Mode Contribution in Nucleon-Delta Transition | 16 latex pages, 7 figures, to appear in PRD | Phys.Rev.D76:074009,2007 | 10.1103/PhysRevD.76.074009 | null | hep-ph | null | We investigate the transition form factors between nucleon and $\Delta$(1232)
particles by using a covariant quark-spectator-diquark field theory model in
(3+1) dimensions. Performing a light-front calculation in parallel with the
manifestly covariant calculation in light-front helicity basis, we examine the
light-front zero-mode contribution to the helicity components of light-front
good ("+") current matrix elements. Choosing the light-front gauge
($\epsilon^+_{h=\pm}=0$) with circular polarization in Drell-Yan-West frame, we
find that only the helicity components $({1\over 2}, {1\over 2})$ and $({1\over
2},-{1\over 2})$ of the good current receive the zero-mode contribution. Taking
into account the zero-mode, we find the prescription independence in obtaining
the light-front solution of form factors from any three helicity matrix
elements with smeared light-front wavefunctions. The angular condition, which
guarantees the full covariance of different schemes, is recovered.
| [
{
"created": "Wed, 1 Aug 2007 15:00:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Yu",
"Jianghao",
""
],
[
"Wang",
"Teng",
""
],
[
"Ji",
"Chueng-Ryong",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We investigate the transition form factors between nucleon and $\Delta$(1232) particles by using a covariant quark-spectator-diquark field theory model in (3+1) dimensions. Performing a light-front calculation in parallel with the manifestly covariant calculation in light-front helicity basis, we examine the light-front zero-mode contribution to the helicity components of light-front good ("+") current matrix elements. Choosing the light-front gauge ($\epsilon^+_{h=\pm}=0$) with circular polarization in Drell-Yan-West frame, we find that only the helicity components $({1\over 2}, {1\over 2})$ and $({1\over 2},-{1\over 2})$ of the good current receive the zero-mode contribution. Taking into account the zero-mode, we find the prescription independence in obtaining the light-front solution of form factors from any three helicity matrix elements with smeared light-front wavefunctions. The angular condition, which guarantees the full covariance of different schemes, is recovered. |
1107.4317 | Andrea De Simone | Andrea De Simone, Germano Nardini, Mariano Quiros, Antonio Riotto | Magnetic Fields at First Order Phase Transition: A Threat to Electroweak
Baryogenesis | 16 pages, 4 figures. Minor corrections and references added to match
published version | JCAP 1110:030,2011 | 10.1088/1475-7516/2011/10/030 | CERN-PH-TH/2011-177, UAB-FT-695, ULB-TH/11-18 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generation of the observed baryon asymmetry may have taken place during
the electroweak phase transition, thus involving physics testable at LHC, a
scenario dubbed electroweak baryogenesis. In this paper we point out that the
magnetic field which is produced in the bubbles of a first order phase
transition endangers the baryon asymmetry produced in the bubble walls. The
reason being that the produced magnetic field couples to the sphaleron magnetic
moment and lowers the sphaleron energy; this strengthens the sphaleron
transitions inside the bubbles and triggers a more effective wash out of the
baryon asymmetry. We apply this scenario to the Minimal Supersymmetric
extension of the Standard Model (MSSM) where, in the absence of a magnetic
field, successful electroweak baryogenesis requires the lightest CP-even Higgs
and the right-handed stop masses to be lighter than about 127 GeV and 120 GeV,
respectively. We show that even for moderate values of the magnetic field, the
Higgs mass required to preserve the baryon asymmetry is below the present
experimental bound. As a consequence electroweak baryogenesis within the MSSM
should be confronted on the one hand to future measurements at the LHC on the
Higgs and the right-handed stop masses, and on the other hand to more precise
calculations of the magnetic field produced at the electroweak phase
transition.
| [
{
"created": "Thu, 21 Jul 2011 17:16:48 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Oct 2011 13:39:33 GMT",
"version": "v2"
}
] | 2011-10-24 | [
[
"De Simone",
"Andrea",
""
],
[
"Nardini",
"Germano",
""
],
[
"Quiros",
"Mariano",
""
],
[
"Riotto",
"Antonio",
""
]
] | The generation of the observed baryon asymmetry may have taken place during the electroweak phase transition, thus involving physics testable at LHC, a scenario dubbed electroweak baryogenesis. In this paper we point out that the magnetic field which is produced in the bubbles of a first order phase transition endangers the baryon asymmetry produced in the bubble walls. The reason being that the produced magnetic field couples to the sphaleron magnetic moment and lowers the sphaleron energy; this strengthens the sphaleron transitions inside the bubbles and triggers a more effective wash out of the baryon asymmetry. We apply this scenario to the Minimal Supersymmetric extension of the Standard Model (MSSM) where, in the absence of a magnetic field, successful electroweak baryogenesis requires the lightest CP-even Higgs and the right-handed stop masses to be lighter than about 127 GeV and 120 GeV, respectively. We show that even for moderate values of the magnetic field, the Higgs mass required to preserve the baryon asymmetry is below the present experimental bound. As a consequence electroweak baryogenesis within the MSSM should be confronted on the one hand to future measurements at the LHC on the Higgs and the right-handed stop masses, and on the other hand to more precise calculations of the magnetic field produced at the electroweak phase transition. |
hep-ph/0204005 | Robert Shrock | Robert Shrock | On the Large-$N_c$ Limit and Electroweak Interactions: Some Properties
of the $N_c$-Extended Standard Model | 10 pages, latex, uses ws-p8-50x6-00.cls and sprocl.sty (included);
talk given at the Workshop on the Phenomenology of Large N_C QCD, ASU (Jan.
2002), to be published in the proceedings | null | 10.1142/9789812776914_0011 | null | hep-ph hep-th | null | We discuss properties of QCD with variable and large $N_c$, taking into
account electroweak interactions; i.e., we analyze the generalization of the
standard model based on the gauge group $G={\rm SU}(N_c) \times {\rm SU(2)}_L
\times {\rm U(1)}_Y$. General classes of solutions to anomaly constraints are
given, and it is shown that these allow a $T_3 = \pm 1/2$ quark or $T_3=-1/2$
lepton rather than the neutrino as an electrically neutral fermion. The issue
of grand unification is addressed, and it is shown that $G$ cannot be embedded
in the usual way in a simple SO($N$) or SU($N$) gauge group unless $N_c=3$. The
ratio of strengths of QCD and electroweak interactions is discussed.
| [
{
"created": "Sat, 30 Mar 2002 18:01:16 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Shrock",
"Robert",
""
]
] | We discuss properties of QCD with variable and large $N_c$, taking into account electroweak interactions; i.e., we analyze the generalization of the standard model based on the gauge group $G={\rm SU}(N_c) \times {\rm SU(2)}_L \times {\rm U(1)}_Y$. General classes of solutions to anomaly constraints are given, and it is shown that these allow a $T_3 = \pm 1/2$ quark or $T_3=-1/2$ lepton rather than the neutrino as an electrically neutral fermion. The issue of grand unification is addressed, and it is shown that $G$ cannot be embedded in the usual way in a simple SO($N$) or SU($N$) gauge group unless $N_c=3$. The ratio of strengths of QCD and electroweak interactions is discussed. |
hep-ph/9906207 | Carlos Quimbaya Fisica Unalcol | John Morales, Carlos Quimbay, and Frank Fonseca (Universidad Nacional
de Colombia, Santafe de Bogota, D.C., Colombia) | Fermionic dispersion relations at finite temperature and non-vanishing
chemical potentials in the minimal standard model | LaTeX File, 18 pages, 1 Postscript figure | Nucl.Phys. B560 (1999) 601-616 | 10.1016/S0550-3213(99)00459-9 | FIUN-CP-99/1 | hep-ph | null | We calculate the fermionic dispersion relations in the minimal standard model
at finite temperature in presence of non-vanishing chemical potentials due to
the CP-asymmetric fermionic background. The dispersion relations are calculated
for a vacuum expectation value of the Higgs field equal to zero (unbroken
electroweak symmetry). The calculation is performed in the real time formalism
of the thermal field theory at one-loop order in a general $\xi$ gauge. The
fermionic self-energy is calculated at leading order in temperature and
chemical potential and this fact permits us to obtain gauge invariant
analytical expressions for the dispersion relations.
| [
{
"created": "Tue, 1 Jun 1999 16:25:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Morales",
"John",
"",
"Universidad Nacional\n de Colombia, Santafe de Bogota, D.C., Colombia"
],
[
"Quimbay",
"Carlos",
"",
"Universidad Nacional\n de Colombia, Santafe de Bogota, D.C., Colombia"
],
[
"Fonseca",
"Frank",
"",
"Universidad Nacional\n de Co... | We calculate the fermionic dispersion relations in the minimal standard model at finite temperature in presence of non-vanishing chemical potentials due to the CP-asymmetric fermionic background. The dispersion relations are calculated for a vacuum expectation value of the Higgs field equal to zero (unbroken electroweak symmetry). The calculation is performed in the real time formalism of the thermal field theory at one-loop order in a general $\xi$ gauge. The fermionic self-energy is calculated at leading order in temperature and chemical potential and this fact permits us to obtain gauge invariant analytical expressions for the dispersion relations. |
1012.0341 | Sally Dawson | S. Dawson, C. B. Jackson, and P. Jaiswal | Associated b-Quark Higgs Boson Production at the LHC | 35th International Conference of High Energy Physics - ICHEP2010,
July 22-28, 2010, Paris France | PoS ICHEP2010:052,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The associated production of a Higgs boson with a b quark is a discovery mode
for an MSSM Higgs boson at large tan beta. We present updates on the production
rate at the LHC, along with a discussion of the importance of the SQCD
corrections from squark and gluino loops. We also discuss the purely
electroweak contributions.
| [
{
"created": "Wed, 1 Dec 2010 22:28:26 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Dawson",
"S.",
""
],
[
"Jackson",
"C. B.",
""
],
[
"Jaiswal",
"P.",
""
]
] | The associated production of a Higgs boson with a b quark is a discovery mode for an MSSM Higgs boson at large tan beta. We present updates on the production rate at the LHC, along with a discussion of the importance of the SQCD corrections from squark and gluino loops. We also discuss the purely electroweak contributions. |
1205.4751 | Swarup Kumar Majee | Swarup Kumar Majee (Taiwan, Natl. Taiwan U.) | The Impact of Non-zero \theta_{13} on Neutrino Mass and Leptogenesis in
a SUSY SO(10) Model | 7 pages, 6 figures, 1 table. arXiv admin note: text overlap with
arXiv:1007.5085 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent measurement of the reactor angle as $\sin^2 2\theta_{13} = 0.092
\pm 0.016(stat) \pm 0.005(syst)$ come from the Daya Bay collaboration. Evidence
of nonzero \theta_{13} was also there at T2K, MINOS and Double Chooz
experiments. We study the implication of these recent data on neutrino mass
matrix and consequently on leptogenesis in a supersymmetric SO(10) model. To
explain the smallness of neutrino mass, in general, we require a heavy Majorana
neutrino which is a natural candidate in SO(10) model. In minimal SO(10) model,
the symmetry breaking scale or the right-handed neutrino mass scale is close to
the GUT scale. It is not only beyond the reach of any present or future
collider search but the lepton asymmetry generated from its decay is in
conflict with the gravitino constraint as well as unable to fit the neutrino
data. We show that addition of an extra fermion singlet can accommodate the
observed recent neutrino data in a supersymmetric SO(10) model. This model can
generate the desired lepton asymmetry and provide TeV scale doubly-charged
Higgs scalars to be detected at LHC.
| [
{
"created": "Mon, 21 May 2012 21:10:39 GMT",
"version": "v1"
}
] | 2012-05-23 | [
[
"Majee",
"Swarup Kumar",
"",
"Taiwan, Natl. Taiwan U."
]
] | The recent measurement of the reactor angle as $\sin^2 2\theta_{13} = 0.092 \pm 0.016(stat) \pm 0.005(syst)$ come from the Daya Bay collaboration. Evidence of nonzero \theta_{13} was also there at T2K, MINOS and Double Chooz experiments. We study the implication of these recent data on neutrino mass matrix and consequently on leptogenesis in a supersymmetric SO(10) model. To explain the smallness of neutrino mass, in general, we require a heavy Majorana neutrino which is a natural candidate in SO(10) model. In minimal SO(10) model, the symmetry breaking scale or the right-handed neutrino mass scale is close to the GUT scale. It is not only beyond the reach of any present or future collider search but the lepton asymmetry generated from its decay is in conflict with the gravitino constraint as well as unable to fit the neutrino data. We show that addition of an extra fermion singlet can accommodate the observed recent neutrino data in a supersymmetric SO(10) model. This model can generate the desired lepton asymmetry and provide TeV scale doubly-charged Higgs scalars to be detected at LHC. |
1308.1519 | Asmita Mukherjee | A. Harindranath, Rajen Kundu, Asmita Mukherjee | On transverse spin sum rules | 11 pages, Latex | null | 10.1016/j.physletb.2013.11.042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we provide explicit calculations that support the conclusions
stated in Phys. Rev. Lett. 111, 039102 (2013) (comment), regarding recent
literature on transverse polarization. We also compare and contrast two methods
of deriving spin sum rules.
| [
{
"created": "Wed, 7 Aug 2013 09:31:50 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Harindranath",
"A.",
""
],
[
"Kundu",
"Rajen",
""
],
[
"Mukherjee",
"Asmita",
""
]
] | In this work we provide explicit calculations that support the conclusions stated in Phys. Rev. Lett. 111, 039102 (2013) (comment), regarding recent literature on transverse polarization. We also compare and contrast two methods of deriving spin sum rules. |
2307.07510 | Xiaoyuan Zhang | Wen Chen, Jun Gao, Yibei Li, Zhen Xu, Xiaoyuan Zhang, Hua Xing Zhu | NNLL Resummation for Projected Three-Point Energy Correlator | 28 pages + appendix, 13 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The projected energy correlator measures the energy deposited in multiple
detectors as a function of the largest angular distance $x_L = (1 -
\cos\chi_L)/2$ between detectors. The collinear limit $x_L\to 0$ of the
projected energy correlator is particularly interesting for understanding the
jet-substructures, while the large logarithms of $x_L$ could potentially spoil
the perturbation theory and must be resummed. As a necessary ingredient for its
resummation at next-to-next-to-leading logarithmic (NNLL) accuracy, we
calculate the two-loop jet functions for the projected three-point energy
correlator (E3C), using direct integration method and the parameter space
Integration-by-Part (IBP) method. We then present the NNLL resummation for
$e^+e^-$ annihilation and an approximate NNLL resummation for $pp\rightarrow
jj$ process, where the two-loop hard constant is estimated in the latter case.
The convergence is improved and the hadronization effect in the collinear limit
is suppressed when considering the ratio of E3C distribution to two-point
energy-energy correlator (EEC). Our results show potential in precision
determination of strong coupling constant using energy correlators from both
$e^+e^-$ data and $pp$ data.
| [
{
"created": "Fri, 14 Jul 2023 17:58:13 GMT",
"version": "v1"
}
] | 2023-07-17 | [
[
"Chen",
"Wen",
""
],
[
"Gao",
"Jun",
""
],
[
"Li",
"Yibei",
""
],
[
"Xu",
"Zhen",
""
],
[
"Zhang",
"Xiaoyuan",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | The projected energy correlator measures the energy deposited in multiple detectors as a function of the largest angular distance $x_L = (1 - \cos\chi_L)/2$ between detectors. The collinear limit $x_L\to 0$ of the projected energy correlator is particularly interesting for understanding the jet-substructures, while the large logarithms of $x_L$ could potentially spoil the perturbation theory and must be resummed. As a necessary ingredient for its resummation at next-to-next-to-leading logarithmic (NNLL) accuracy, we calculate the two-loop jet functions for the projected three-point energy correlator (E3C), using direct integration method and the parameter space Integration-by-Part (IBP) method. We then present the NNLL resummation for $e^+e^-$ annihilation and an approximate NNLL resummation for $pp\rightarrow jj$ process, where the two-loop hard constant is estimated in the latter case. The convergence is improved and the hadronization effect in the collinear limit is suppressed when considering the ratio of E3C distribution to two-point energy-energy correlator (EEC). Our results show potential in precision determination of strong coupling constant using energy correlators from both $e^+e^-$ data and $pp$ data. |
2112.12569 | Subhasmita Mishra | Subhasmita Mishra, Nimmala Narendra, Prafulla Kumar Panda, Nirakar
Sahoo | Scalar Dark Matter and Radiative Dirac neutrino mass in an extended
$U(1)_{B-L}$ model | 19 pages, 18 figures | null | 10.1016/j.nuclphysb.2022.115855 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a gauged $U(1)_{B-L}$ extension of standard model with inclusion
of three right-handed neutrinos of exotic $B-L$ charges to cancel the gauge
anomaly. Non-trivial transformation of new particles under $B-L$ symmetry
forbids the neutrino mass at tree level and hence a small Dirac mass can be
generated radiatively at one loop with a doublet fermion and singlet scalar. We
also discuss the phenomenology of a scalar dark matter, which can be obtained
from the mixing of neutral CP even component of a doublet and real singlet
scalar. An adhoc $Z_2$ symmetry is required in the current framework to
stabilize the dark matter candidate. Presence of new particles with $Z_2$ odd
charges and small mass splitting, makes the phenomenology more interesting by
governing the relic density with co-annihilation processes. We explore the
spin-independent direct detection constraints on dark matter via the scalar
mediation. The new particle spectrum not only opens up new window for dark
matter study but also satisfy the constraints from lepton flavor violating
decay of $\mu \rightarrow e \gamma$.
| [
{
"created": "Thu, 23 Dec 2021 14:31:05 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Mishra",
"Subhasmita",
""
],
[
"Narendra",
"Nimmala",
""
],
[
"Panda",
"Prafulla Kumar",
""
],
[
"Sahoo",
"Nirakar",
""
]
] | We explore a gauged $U(1)_{B-L}$ extension of standard model with inclusion of three right-handed neutrinos of exotic $B-L$ charges to cancel the gauge anomaly. Non-trivial transformation of new particles under $B-L$ symmetry forbids the neutrino mass at tree level and hence a small Dirac mass can be generated radiatively at one loop with a doublet fermion and singlet scalar. We also discuss the phenomenology of a scalar dark matter, which can be obtained from the mixing of neutral CP even component of a doublet and real singlet scalar. An adhoc $Z_2$ symmetry is required in the current framework to stabilize the dark matter candidate. Presence of new particles with $Z_2$ odd charges and small mass splitting, makes the phenomenology more interesting by governing the relic density with co-annihilation processes. We explore the spin-independent direct detection constraints on dark matter via the scalar mediation. The new particle spectrum not only opens up new window for dark matter study but also satisfy the constraints from lepton flavor violating decay of $\mu \rightarrow e \gamma$. |
hep-ph/0005197 | Ed Stoeffhaas | V. Barger, S. Pakvasa, T. J. Weiler, and K. Whisnant | CPT-odd Resonances in Neutrino Oscillations | 10 pages, Revtex (singlespaced), uses epsf.sty, 2 postscript figures | Phys.Rev.Lett.85:5055-5058,2000 | 10.1103/PhysRevLett.85.5055 | MADPH-00-1177, UH-511-964-00, VAND-TH-00-5, AMES-HET 00-04 | hep-ph | null | We consider the consequences for future neutrino factory experiments of small
CPT-odd interactions in neutrino oscillations. The \nu_\mu\to\nu_\mu and
\bar\nu_\mu\to\bar\nu_\mu survival probabilities at a baseline L=732 km can
test for CPT-odd contributions at orders of magnitude better sensitivity than
present limits. Interference between the CPT-violating interaction and CPT-even
mass terms in the Lagrangian can lead to a resonant enhancement of the
oscillation amplitude. For oscillations in matter, a simultaneous enhancement
of both neutrino and antineutrino oscillation amplitudes is possible.
| [
{
"created": "Thu, 18 May 2000 21:10:28 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Barger",
"V.",
""
],
[
"Pakvasa",
"S.",
""
],
[
"Weiler",
"T. J.",
""
],
[
"Whisnant",
"K.",
""
]
] | We consider the consequences for future neutrino factory experiments of small CPT-odd interactions in neutrino oscillations. The \nu_\mu\to\nu_\mu and \bar\nu_\mu\to\bar\nu_\mu survival probabilities at a baseline L=732 km can test for CPT-odd contributions at orders of magnitude better sensitivity than present limits. Interference between the CPT-violating interaction and CPT-even mass terms in the Lagrangian can lead to a resonant enhancement of the oscillation amplitude. For oscillations in matter, a simultaneous enhancement of both neutrino and antineutrino oscillation amplitudes is possible. |
hep-ph/0608204 | Jose Antonio Oller | Jose Antonio Oller, Michela Verbeni, Joaquim Prades | Meson-Baryon Effective Chiral Lagrangians to O(q^3) | 19 pages | JHEP 0609:079,2006 | 10.1088/1126-6708/2006/09/079 | null | hep-ph nucl-th | null | We construct the complete and minimal O(q^2) and O(q^3) three-flavour Lorentz
invariant chiral meson-baryon Lagrangians for the first time in the literature.
We compare with previous three-flavour studies reducing the number of
independent monomials and adding new ones that were missing.
| [
{
"created": "Fri, 18 Aug 2006 10:59:25 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Oller",
"Jose Antonio",
""
],
[
"Verbeni",
"Michela",
""
],
[
"Prades",
"Joaquim",
""
]
] | We construct the complete and minimal O(q^2) and O(q^3) three-flavour Lorentz invariant chiral meson-baryon Lagrangians for the first time in the literature. We compare with previous three-flavour studies reducing the number of independent monomials and adding new ones that were missing. |
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