id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1302.7004 | S. Weinzierl | Luise Adams, Christian Bogner and Stefan Weinzierl | The two-loop sunrise graph with arbitrary masses | 24 pages | null | 10.1063/1.4804996 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the analytical solution of the two-loop sunrise graph with
arbitrary non-zero masses in two space-time dimensions. The analytical result
is obtained by solving a second-order differential equation. The solution
involves elliptic integrals and in particular the solutions of the
corresponding homogeneous differential equation are given by periods of an
elliptic curve.
| [
{
"created": "Wed, 27 Feb 2013 21:07:32 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Adams",
"Luise",
""
],
[
"Bogner",
"Christian",
""
],
[
"Weinzierl",
"Stefan",
""
]
] | We discuss the analytical solution of the two-loop sunrise graph with arbitrary non-zero masses in two space-time dimensions. The analytical result is obtained by solving a second-order differential equation. The solution involves elliptic integrals and in particular the solutions of the corresponding homogeneous differential equation are given by periods of an elliptic curve. |
0907.1668 | Thomas G. Rizzo | Thomas G. Rizzo | Supersymmetry Without (Too Much) Prejudice | 4 pages, 4 figs; talk given at SUSY09 | AIP Conf.Proc.1200:409-412,2010 | 10.1063/1.3327602 | SLAC-PUB-13710 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have recently completed a detailed scan of the 19-dimensional parameter
space of the phenomenological MSSM, i.e., the CP-conserving MSSM assuming
Minimal Flavor Violation(MFV) with the first two sfermion generations
degenerate. We found a large set of parameter space points that satisfied all
of the existing experimental and theoretical constraints. This analysis allows
us to examine the general features of the MSSM without reference to any
particular SUSY breaking scenario or any other assumptions about physics at
higher scales. This study opens up new possibilities for SUSY phenomenology
both at colliders and in astrophysical observations.
| [
{
"created": "Fri, 10 Jul 2009 19:02:13 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2009 14:18:44 GMT",
"version": "v2"
}
] | 2011-02-11 | [
[
"Rizzo",
"Thomas G.",
""
]
] | We have recently completed a detailed scan of the 19-dimensional parameter space of the phenomenological MSSM, i.e., the CP-conserving MSSM assuming Minimal Flavor Violation(MFV) with the first two sfermion generations degenerate. We found a large set of parameter space points that satisfied all of the existing experimental and theoretical constraints. This analysis allows us to examine the general features of the MSSM without reference to any particular SUSY breaking scenario or any other assumptions about physics at higher scales. This study opens up new possibilities for SUSY phenomenology both at colliders and in astrophysical observations. |
hep-ph/9901393 | Mairi Sakellariadi | Mairi Sakellariadou (CERN and University of Sussex) | Supersymmetric Hybrid Inflation: Explaining the Spectrum of Cosmological
Perturbations through a Multiple-Stage Inflationary Model | 1 LaTeX file, 2 figures and 2 style files. To appear in the
Proceedings of the 1998 Euroconference on 3k Cosmology, 5-10 October 1998,
Rome (Italy) | null | 10.1063/1.59346 | null | hep-ph | null | We explore the possibility that a multiple-stage inflationary scenario based
on supersymmetric GUT models, can account for the break at $k_b \simeq 0.05
h/Mpc$ in the power spectrum of galaxy clustering, while it reproduces the
angular power spectrum of cosmic microwave background anisotropies.
| [
{
"created": "Sun, 24 Jan 1999 12:14:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Sakellariadou",
"Mairi",
"",
"CERN and University of Sussex"
]
] | We explore the possibility that a multiple-stage inflationary scenario based on supersymmetric GUT models, can account for the break at $k_b \simeq 0.05 h/Mpc$ in the power spectrum of galaxy clustering, while it reproduces the angular power spectrum of cosmic microwave background anisotropies. |
0805.2753 | Elena G. Ferreiro | E. G. Ferreiro | Charmonium Dissociation and Recombination: Cold Effects | 4 pages, 3 figures. Contribution to the QCD session of 43rd
Rencontres de Moriond 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thirty years ago, Matsui and Satz proposed the $J/\psi$ destruction as a
signal of a Quark Gluon Plasma (QGP) formation, due to the Debye screening
between the pair c-cbar. At the light of the recent experimental data, I review
the different effects on $J/\psi$ production, from SPS to LHC energies,
distinguishing between Cold Nuclear Matter (CNM) and QGP effects. Different
possibilities and explanations for the available experimental data are
discussed. Model predictions for the arriving LHC data are also presented.
| [
{
"created": "Sun, 18 May 2008 20:21:40 GMT",
"version": "v1"
}
] | 2008-05-20 | [
[
"Ferreiro",
"E. G.",
""
]
] | Thirty years ago, Matsui and Satz proposed the $J/\psi$ destruction as a signal of a Quark Gluon Plasma (QGP) formation, due to the Debye screening between the pair c-cbar. At the light of the recent experimental data, I review the different effects on $J/\psi$ production, from SPS to LHC energies, distinguishing between Cold Nuclear Matter (CNM) and QGP effects. Different possibilities and explanations for the available experimental data are discussed. Model predictions for the arriving LHC data are also presented. |
1001.0570 | Maxim Chernodub | M.N. Chernodub | Background magnetic field stabilizes QCD string against breaking | 4 pages, 2 figures, uses RevTeX 4.1 | Mod.Phys.Lett.A 29 (2014) 1450162 | 10.1142/S0217732314501624 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The confinement of quarks in hadrons occurs due to formation of QCD string.
At large separation between the quarks the QCD string breaks into pieces due to
light quark-antiquark pair creation. We argue that there exist a critical
background magnetic field e B ~ 16 m_\pi^2, above which the string breaking is
impossible in the transverse directions with respect to the axis of the
magnetic field. Thus, at strong enough magnetic field a new, asymmetrically
confining phase may form. The effect - which can potentially be tested at
LHC/ALICE experiment - leads to abundance of u-quark rich hadrons and to excess
of radially excited mesons in the noncentral heavy-ion collisions compared to
the central ones.
| [
{
"created": "Mon, 4 Jan 2010 22:38:23 GMT",
"version": "v1"
}
] | 2022-01-07 | [
[
"Chernodub",
"M. N.",
""
]
] | The confinement of quarks in hadrons occurs due to formation of QCD string. At large separation between the quarks the QCD string breaks into pieces due to light quark-antiquark pair creation. We argue that there exist a critical background magnetic field e B ~ 16 m_\pi^2, above which the string breaking is impossible in the transverse directions with respect to the axis of the magnetic field. Thus, at strong enough magnetic field a new, asymmetrically confining phase may form. The effect - which can potentially be tested at LHC/ALICE experiment - leads to abundance of u-quark rich hadrons and to excess of radially excited mesons in the noncentral heavy-ion collisions compared to the central ones. |
hep-ph/0407085 | Marco Radici | Marco Radici | How to Study Quark Spin without Spin | invited talk at 2nd PANDA Physics Workshop, Frascati, March 18-19,
2004; 23 pages, 13 figures, Frascati Physics Series style file included;
revised version including more references | null | null | null | hep-ph | null | I review the most important single- and double-spin asymmetries that allow
for the extraction of transversity and other chiral-odd and/or T-odd parton
densities, necessary to explore the partonic content and the spin structure of
the nucleon. With particular reference to the proposed GSI-HESR facility, I
report on some Monte-Carlo simulations of cross sections and spin asymmetries
for (un)polarized Drell-Yan with protons and antiprotons at the proposed
kinematics for this future facility.
| [
{
"created": "Wed, 7 Jul 2004 14:24:36 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jul 2004 09:10:56 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Jul 2004 10:38:14 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Radici",
"Marco",
""
]
] | I review the most important single- and double-spin asymmetries that allow for the extraction of transversity and other chiral-odd and/or T-odd parton densities, necessary to explore the partonic content and the spin structure of the nucleon. With particular reference to the proposed GSI-HESR facility, I report on some Monte-Carlo simulations of cross sections and spin asymmetries for (un)polarized Drell-Yan with protons and antiprotons at the proposed kinematics for this future facility. |
hep-ph/9702396 | V. B. Svetovoy | V.B. Svetovoy | Current-Carrying Zero Mode for the Nielsen-Olesen String | 10 pages, LATEX, no figures, submitted to Phys Lett B | Phys.Lett. B399 (1997) 40-44 | 10.1016/S0370-2693(97)00269-4 | null | hep-ph astro-ph hep-th | null | Zero modes of strings in the abelian Higgs model are analyzed. In spite of
the fact that the gauge symmetry is not broken in the string center, the
corresponding zero mode is shown to exist and to see it one has to analyze
carefully the dependence on transverse coordinates for the excitations. The
analysis of this kind is also important for the Witten model of superconducting
string. Unusual properties of the zero modes connected with the broken gauge
symmetry in the string background are investigated. One of the modes carries
the current quite similar to that in the Witten model and gives back reaction
to the string profile. It is claimed that the current in the string improves
stability of the electroweak string.
| [
{
"created": "Sat, 22 Feb 1997 10:20:01 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Svetovoy",
"V. B.",
""
]
] | Zero modes of strings in the abelian Higgs model are analyzed. In spite of the fact that the gauge symmetry is not broken in the string center, the corresponding zero mode is shown to exist and to see it one has to analyze carefully the dependence on transverse coordinates for the excitations. The analysis of this kind is also important for the Witten model of superconducting string. Unusual properties of the zero modes connected with the broken gauge symmetry in the string background are investigated. One of the modes carries the current quite similar to that in the Witten model and gives back reaction to the string profile. It is claimed that the current in the string improves stability of the electroweak string. |
2403.06000 | Garth Huber | Z. Ahmed, R.S. Evans, I. Goel, G.M. Huber, S.J.D. Kay, W.B. Li, L.
Preet, A. Usman | DEMPgen: Physics event generator for Deep Exclusive Meson Production at
Jefferson Lab and the EIC | 37 pages, 27 figures | null | null | null | hep-ph hep-ex physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | There is increasing interest in deep exclusive meson production (DEMP)
reactions, as they provide access to Generalized Parton Distributions over a
broad kinematic range, and are the only means of measuring pion and kaon
charged electric form factors at high $Q^2$. Such investigations are a
particularly useful tool in the study of hadronic structure in QCD's transition
regime from long-distance interactions described in terms of meson-nucleon
degrees of freedom, to short-dist ance interactions governed by hard
quark-gluon degrees of freedom. To assist the planning of future experimental
investigations of DEMP reactions in this transition regime, such as at
Jefferson Lab and the Electron-Ion Collider (EIC), we have written a special
purpose event generator, DEMPgen. Several types of DEMP reactions can be
generated: $t$-channel $p(e,e^{\prime}\pi^+)n$,
$p(e,e^{\prime}K^+)\Lambda[\Sigma^0]$, and $\vec{n}(e,e^{\prime}\pi^-)p$ from a
polarized $^3$He target. DEMPgen is modular in form, so that additional
reactions can be added over time. The generator produces kinematically-complete
reaction events which are absolutely-normalized, so that projected event rates
can be predicted, and detector resolution requirements studied. The event
normalization is based on parameterizations of theoretical models, appropriate
to the kinematic regime under study. Both fixed target modes and collider beam
modes are supported. This paper presents the structure of the generator, the
model parameterizations used for absolute event weighting, the kinematic
distributions of the generated particles, some initial results using the
generator, and instructions for its use.
| [
{
"created": "Sat, 9 Mar 2024 20:17:26 GMT",
"version": "v1"
}
] | 2024-03-12 | [
[
"Ahmed",
"Z.",
""
],
[
"Evans",
"R. S.",
""
],
[
"Goel",
"I.",
""
],
[
"Huber",
"G. M.",
""
],
[
"Kay",
"S. J. D.",
""
],
[
"Li",
"W. B.",
""
],
[
"Preet",
"L.",
""
],
[
"Usman",
"A.",
""
... | There is increasing interest in deep exclusive meson production (DEMP) reactions, as they provide access to Generalized Parton Distributions over a broad kinematic range, and are the only means of measuring pion and kaon charged electric form factors at high $Q^2$. Such investigations are a particularly useful tool in the study of hadronic structure in QCD's transition regime from long-distance interactions described in terms of meson-nucleon degrees of freedom, to short-dist ance interactions governed by hard quark-gluon degrees of freedom. To assist the planning of future experimental investigations of DEMP reactions in this transition regime, such as at Jefferson Lab and the Electron-Ion Collider (EIC), we have written a special purpose event generator, DEMPgen. Several types of DEMP reactions can be generated: $t$-channel $p(e,e^{\prime}\pi^+)n$, $p(e,e^{\prime}K^+)\Lambda[\Sigma^0]$, and $\vec{n}(e,e^{\prime}\pi^-)p$ from a polarized $^3$He target. DEMPgen is modular in form, so that additional reactions can be added over time. The generator produces kinematically-complete reaction events which are absolutely-normalized, so that projected event rates can be predicted, and detector resolution requirements studied. The event normalization is based on parameterizations of theoretical models, appropriate to the kinematic regime under study. Both fixed target modes and collider beam modes are supported. This paper presents the structure of the generator, the model parameterizations used for absolute event weighting, the kinematic distributions of the generated particles, some initial results using the generator, and instructions for its use. |
2001.11325 | Sudipta Show | Partha Konar, Ananya Mukherjee, Abhijit Kumar Saha, Sudipta Show | Linking the pseudo-Dirac dark matter and radiative neutrino mass in a
singlet doublet scenario | 6 figures, 23 pages, version accepted for publication in PRD | Phys. Rev. D 102, 015024 (2020) | 10.1103/PhysRevD.102.015024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine simple extension of the standard model with a pair of fermions,
one singlet and a doublet, in a common thread linking the dark matter problem
with the smallness of neutrino masses associated with several exciting
features. In the presence of a small bare Majorana mass term, the singlet
fermion brings in a pseudo-Dirac dark matter capable of evading the strong
spin-independent direct detection bound by suppressing the dark matter
annihilation processes mediated by the neutral current. In consequence, the
allowed range of mixing angle between the doublet and the singlet fermions gets
enhanced substantially. Presence of the same mass term in association of
singlet scalars also elevates tiny but nonzero masses radiatively for light
Majorana neutrino satisfying observed oscillation data.
| [
{
"created": "Thu, 30 Jan 2020 14:03:45 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2020 17:13:01 GMT",
"version": "v2"
}
] | 2020-07-28 | [
[
"Konar",
"Partha",
""
],
[
"Mukherjee",
"Ananya",
""
],
[
"Saha",
"Abhijit Kumar",
""
],
[
"Show",
"Sudipta",
""
]
] | We examine simple extension of the standard model with a pair of fermions, one singlet and a doublet, in a common thread linking the dark matter problem with the smallness of neutrino masses associated with several exciting features. In the presence of a small bare Majorana mass term, the singlet fermion brings in a pseudo-Dirac dark matter capable of evading the strong spin-independent direct detection bound by suppressing the dark matter annihilation processes mediated by the neutral current. In consequence, the allowed range of mixing angle between the doublet and the singlet fermions gets enhanced substantially. Presence of the same mass term in association of singlet scalars also elevates tiny but nonzero masses radiatively for light Majorana neutrino satisfying observed oscillation data. |
1112.5429 | Leonard Fister | Leonard Fister and Jan M. Pawlowski | Yang-Mills theory at non-vanishing temperature | Talk given by LF at the International Workshop on QCD Green's
Functions, Confinement and Phenomenology (QCD-TNT-II), 5-9 September 2011,
Trento, Italy; 12 pages, 9 figures | null | null | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute ghost and gluon propagators of Yang-Mills theory in the Landau
gauge at non-vanishing temperature within a functional renormalisation group
setting. We construct purely thermal flows, that project onto thermal
fluctuations only. For temperatures and momenta above the
confinement-deconfinement temperature Tc the electric propagator shows a
thermal suppression due to Debye screening. The magnetic gluon propagator shows
a thermal scaling and tends towards the three-dimensional one. In this region
both propagators match the lattice propagators. The thermal scaling is also
reflected in the infrared suppression of the ghost-gluon vertex. For
temperatures below Tc the electric propagator shows an enhancement which is in
qualitative agreement with the lattice behaviour.
| [
{
"created": "Thu, 22 Dec 2011 19:39:29 GMT",
"version": "v1"
}
] | 2011-12-23 | [
[
"Fister",
"Leonard",
""
],
[
"Pawlowski",
"Jan M.",
""
]
] | We compute ghost and gluon propagators of Yang-Mills theory in the Landau gauge at non-vanishing temperature within a functional renormalisation group setting. We construct purely thermal flows, that project onto thermal fluctuations only. For temperatures and momenta above the confinement-deconfinement temperature Tc the electric propagator shows a thermal suppression due to Debye screening. The magnetic gluon propagator shows a thermal scaling and tends towards the three-dimensional one. In this region both propagators match the lattice propagators. The thermal scaling is also reflected in the infrared suppression of the ghost-gluon vertex. For temperatures below Tc the electric propagator shows an enhancement which is in qualitative agreement with the lattice behaviour. |
hep-ph/9905216 | Oleg Lebedev | Oleg Lebedev | Constraining SUSY Models with Spontaneous CP-Violation via B->\psi K_s | 13 pages, 7 figures, revised | Int.J.Mod.Phys.A15:2987-3000,2000 | 10.1142/S0217751X00001087 | VPI-IPPAP-99-04 | hep-ph | null | We study CP-violating effects in $B\to \psi K_{s}$ decay within minimal
supersymmetric models with spontaneous CP-violation. We find that the
CP-asymmetry predicted by the Standard Model in this decay, $\sin 2\beta \geq
0.4$, cannot be accommodated in these models without violating the bound on the
neutron electric dipole moment. This result holds for NMSSM-like models with an
arbitrary number of sterile superfields. Further implications of the scenario
are discussed.
| [
{
"created": "Mon, 3 May 1999 21:13:40 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jun 1999 16:53:03 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Lebedev",
"Oleg",
""
]
] | We study CP-violating effects in $B\to \psi K_{s}$ decay within minimal supersymmetric models with spontaneous CP-violation. We find that the CP-asymmetry predicted by the Standard Model in this decay, $\sin 2\beta \geq 0.4$, cannot be accommodated in these models without violating the bound on the neutron electric dipole moment. This result holds for NMSSM-like models with an arbitrary number of sterile superfields. Further implications of the scenario are discussed. |
1809.00177 | Lianbao Jia | Lian-Bao Jia, Xian-Jin Deng, Chang-Fu Liu | Could the 21-cm absorption be explained by the dark matter suggested by
$^8$Be transitions? | 6 pages, 2 figures, the accepted version, EPJC | null | 10.1140/epjc/s10052-018-6439-z | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stronger than expected 21-cm absorption was observed by EDGES recently,
and another anomaly of $^8$Be transitions would be signatures of new
interactions. These two issues may be related to each other, e.g., pseudoscalar
$A$ mediated fermionic millicharged dark matter (DM), and the 21-cm absorption
could be induced by photon mediated scattering between MeV millicharged DM and
hydrogen. This will be explored in this paper. For fermionic millicharged DM
$\bar{\chi} \chi$ with masses in a range of $2 m_A < 2 m_{\chi} < 3 m_A$, the
p-wave annihilation $\bar{\chi} \chi \to A A$ would be dominant during DM
freeze-out. The s-wave annihilation $\bar{\chi} \chi$ $\to A, \gamma $ $\to e^+
e^-$ is tolerant by constraints from CMB and the 21-cm absorption. The
millicharged DM can evade constraints from direct detection experiments. The
process of $K^+ \to \pi^+ \pi^0$ with the invisible decay $\pi^0 \to \bar{\chi}
\chi$ could be employed to search for the millicharged DM, and future high
intensity $K^+$ sources, such as NA62, will do the job.
| [
{
"created": "Sat, 1 Sep 2018 13:36:39 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Nov 2018 17:43:18 GMT",
"version": "v2"
}
] | 2018-12-05 | [
[
"Jia",
"Lian-Bao",
""
],
[
"Deng",
"Xian-Jin",
""
],
[
"Liu",
"Chang-Fu",
""
]
] | The stronger than expected 21-cm absorption was observed by EDGES recently, and another anomaly of $^8$Be transitions would be signatures of new interactions. These two issues may be related to each other, e.g., pseudoscalar $A$ mediated fermionic millicharged dark matter (DM), and the 21-cm absorption could be induced by photon mediated scattering between MeV millicharged DM and hydrogen. This will be explored in this paper. For fermionic millicharged DM $\bar{\chi} \chi$ with masses in a range of $2 m_A < 2 m_{\chi} < 3 m_A$, the p-wave annihilation $\bar{\chi} \chi \to A A$ would be dominant during DM freeze-out. The s-wave annihilation $\bar{\chi} \chi$ $\to A, \gamma $ $\to e^+ e^-$ is tolerant by constraints from CMB and the 21-cm absorption. The millicharged DM can evade constraints from direct detection experiments. The process of $K^+ \to \pi^+ \pi^0$ with the invisible decay $\pi^0 \to \bar{\chi} \chi$ could be employed to search for the millicharged DM, and future high intensity $K^+$ sources, such as NA62, will do the job. |
hep-ph/9402225 | Arkady Vainshtein | I. Bigi, M. Shifman, N. Uraltsev, A. Vainshtein | Heavy Quark Distribution Function in QCD and the AC$^2$M$^2$ Model | 15 pages, Latex, 2 figures are included (as 2 appended postscript
files), CERN-TH.7159/94, TPI-MINN-94/2-T, UND-HEP-94-BIG02 (a few comments on
the literature are added) | Phys.Lett. B328 (1994) 431-440 | 10.1016/0370-2693(94)91502-4 | null | hep-ph | null | We show that the phenomenological \ACM ansatz is consistent with QCD through
order $1/m_b$ in the description of $B\ra l\bar \nu_l+X_u$ and $B\ra \gamma
+X_s$ transitions, including their energy spectra and differential
distributions. This suggests a concrete realization for the QCD distribution
function, which we call the ``Roman'' function. On the other hand the \ACM
model description of the end-point domain in $B\ra l\bar \nu_l + X_c$ is
incompatible with QCD: a different distribution function enters the description
of $b\ra c$ decays as compared to the transitions to the massless quarks. Both
observations -- the validity of the {\ACM}-like description for heavy-to-light
transitions and the emergence of the new distribution function in the $b\ra c$
case -- are in contradiction to a recent claim in the literature. The intrinsic
limitation of the \ACM model could reveal itself in different values of the
effective $b$ quark mass from fits of the $\Lambda _b$ and $B$ decays.
| [
{
"created": "Fri, 4 Feb 1994 05:11:24 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 1994 06:33:29 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Bigi",
"I.",
""
],
[
"Shifman",
"M.",
""
],
[
"Uraltsev",
"N.",
""
],
[
"Vainshtein",
"A.",
""
]
] | We show that the phenomenological \ACM ansatz is consistent with QCD through order $1/m_b$ in the description of $B\ra l\bar \nu_l+X_u$ and $B\ra \gamma +X_s$ transitions, including their energy spectra and differential distributions. This suggests a concrete realization for the QCD distribution function, which we call the ``Roman'' function. On the other hand the \ACM model description of the end-point domain in $B\ra l\bar \nu_l + X_c$ is incompatible with QCD: a different distribution function enters the description of $b\ra c$ decays as compared to the transitions to the massless quarks. Both observations -- the validity of the {\ACM}-like description for heavy-to-light transitions and the emergence of the new distribution function in the $b\ra c$ case -- are in contradiction to a recent claim in the literature. The intrinsic limitation of the \ACM model could reveal itself in different values of the effective $b$ quark mass from fits of the $\Lambda _b$ and $B$ decays. |
hep-ph/0402202 | Young S. Kim | Y. S. Kim and Marilyn E. Noz | Feynman's Branes and Feynman's Oscillators | LaTex 15 pages, 6 figures, presented at the Workshop on Branes and
Generalized Dynamics (Argonne, Illinois, USA, October 2003) | null | null | null | hep-ph hep-th quant-ph | null | Based on Feynman's lifetime efforts on quantum mechanics and relativity, it
is concluded that the basic difference between field theory and string theory
is that field theory is based on running waves while string theory should deal
with standing waves in the Lorentz-covariant regime.
At the 1970 spring meeting of the American Physical Society held in
Washington, DC, R. P. Feynman stunned the audience by proposing harmonic
oscillators for relativistic bound states, instead of Feynman diagrams. His
talk was later published in the paper of Feynman, Kislinger, and Ravndal [Phys.
Rev. D, Vol. 3, 2706 (1971)]. These authors noted that the hadron mass spectra
can be predicted by the degeneracy of the three-dimensional harmonic
oscillators. In so doing, they started with the Lorentz-invariant differential
equation for the harmonic oscillator, and obtained Lorentz invariant solutions.
However, their solutions are not normalizable in the time-separation variable
and cannot carry probability interpretation. It is pointed out that there are
solutions normalizable in the time-separation variable within the framework of
Wigner's little-group representation of the Poincar\'e group. These solutions
are not invariant but covariant under Lorentz transformations. These solutions
give a covariant bound-state model which gives the quark model and the parton
model as two different limiting cases, in the low- and high-speed limits
respectively.
| [
{
"created": "Thu, 19 Feb 2004 15:50:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Y. S.",
""
],
[
"Noz",
"Marilyn E.",
""
]
] | Based on Feynman's lifetime efforts on quantum mechanics and relativity, it is concluded that the basic difference between field theory and string theory is that field theory is based on running waves while string theory should deal with standing waves in the Lorentz-covariant regime. At the 1970 spring meeting of the American Physical Society held in Washington, DC, R. P. Feynman stunned the audience by proposing harmonic oscillators for relativistic bound states, instead of Feynman diagrams. His talk was later published in the paper of Feynman, Kislinger, and Ravndal [Phys. Rev. D, Vol. 3, 2706 (1971)]. These authors noted that the hadron mass spectra can be predicted by the degeneracy of the three-dimensional harmonic oscillators. In so doing, they started with the Lorentz-invariant differential equation for the harmonic oscillator, and obtained Lorentz invariant solutions. However, their solutions are not normalizable in the time-separation variable and cannot carry probability interpretation. It is pointed out that there are solutions normalizable in the time-separation variable within the framework of Wigner's little-group representation of the Poincar\'e group. These solutions are not invariant but covariant under Lorentz transformations. These solutions give a covariant bound-state model which gives the quark model and the parton model as two different limiting cases, in the low- and high-speed limits respectively. |
hep-ph/0003059 | F. Stef Roux | F. S. Roux | Critical couplings for chiral symmetry breaking via instantons | 11 pages, 3 figures, signs and i's corrected | null | null | UTPT-00-04 | hep-ph | null | Using an instanton effective action formalism, we compute the critical
coupling for the nonperturbative formation of a dynamical mass via instantons
in non-Abelian gauge theories with N_f massless fermions. Only continuous phase
transitions are considered. For large values of N_f the critical couplings are
found to be much smaller than the equivalent critical couplings obtained from
gauge exchange calculations in the ladder approximation.
| [
{
"created": "Tue, 7 Mar 2000 22:09:08 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Mar 2000 20:17:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Roux",
"F. S.",
""
]
] | Using an instanton effective action formalism, we compute the critical coupling for the nonperturbative formation of a dynamical mass via instantons in non-Abelian gauge theories with N_f massless fermions. Only continuous phase transitions are considered. For large values of N_f the critical couplings are found to be much smaller than the equivalent critical couplings obtained from gauge exchange calculations in the ladder approximation. |
hep-ph/0412068 | John Bahcall | John N. Bahcall | Solar Models and Solar Neutrinos: Current Status | Neutrino Physics, Proceedings of the Nobel Symposium 2004, Enkoping,
Sweden, August 19-24, 2004. Eds. L. Bergstrom, O. Botner, P. Carlson, P.O.
Hulth & T. Ohlsson | Phys.Scripta T121 (2005) 46-50 | 10.1088/0031-8949/2005/T121/006 | null | hep-ph astro-ph nucl-ex | null | I provide a summary of the current theoretical knowledge of solar neutrino
fluxes as derived from precise solar models.
| [
{
"created": "Sun, 5 Dec 2004 21:19:41 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bahcall",
"John N.",
""
]
] | I provide a summary of the current theoretical knowledge of solar neutrino fluxes as derived from precise solar models. |
1603.05601 | Pradipta Ghosh | Giorgio Arcadi, Pradipta Ghosh, Yann Mambrini, Mathias Pierre | Re-opening dark matter windows compatible with a diphoton excess | 29 pages, 11 figures, new references added | JCAP 07 (2016) 005 | 10.1088/1475-7516/2016/07/005 | LPT-Orsay 16-17, CPHT-RR013-032016 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a simple setup in which an excess in the di-photon invariant
mass distribution around $750$ GeV, as seen by the ATLAS and CMS
collaborations, is originated through a pair of collimated photon pairs. In
this framework a scalar state $s$ decays into two light pseudo-Goldstone bosons
$a$, each of which subsequently decays into a pair of collimated photons which
are misidentified as a single photon. In a minimal context of spontaneous
symmetry breaking, we show that coupling a complex scalar field
$\Phi=(s+ia)/\sqrt{2}$ to a fermionic dark matter candidate $\chi$, also
responsible for generating its mass, allows for the correct relic density in a
large region of the parameter space, while not being excluded by the direct or
indirect detection experiments. Moreover, the correct relic abundance can
naturally co-exist with a relatively large width for the resonant field $s$.
| [
{
"created": "Thu, 17 Mar 2016 18:15:15 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2016 13:26:34 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Aug 2016 13:26:13 GMT",
"version": "v3"
}
] | 2016-08-31 | [
[
"Arcadi",
"Giorgio",
""
],
[
"Ghosh",
"Pradipta",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Pierre",
"Mathias",
""
]
] | We investigate a simple setup in which an excess in the di-photon invariant mass distribution around $750$ GeV, as seen by the ATLAS and CMS collaborations, is originated through a pair of collimated photon pairs. In this framework a scalar state $s$ decays into two light pseudo-Goldstone bosons $a$, each of which subsequently decays into a pair of collimated photons which are misidentified as a single photon. In a minimal context of spontaneous symmetry breaking, we show that coupling a complex scalar field $\Phi=(s+ia)/\sqrt{2}$ to a fermionic dark matter candidate $\chi$, also responsible for generating its mass, allows for the correct relic density in a large region of the parameter space, while not being excluded by the direct or indirect detection experiments. Moreover, the correct relic abundance can naturally co-exist with a relatively large width for the resonant field $s$. |
hep-ph/0612319 | Jian-Zu Zhang | Jian-Zu Zhang | Searching for Effects of Spatial Noncommutativity via Chern-Simons'
Processes | 18 pages | Phys.Rev.D74:124005,2006 | 10.1103/PhysRevD.74.124005 | null | hep-ph | null | The possibility of testing spatial noncommutativity in the case of both
position-position and momentum-momentum noncommuting via a Chern-Simons'
process is explored. A Chern-Simons process can be realized by an interaction
of a charged particle in special crossed electric and magnetic fields, in which
the Chern-Simons term leads to non-trivial dynamics in the limit of vanishing
kinetic energy. Spatial noncommutativity leads to the spectrum of the orbital
angular momentum possessing fractional values. Furthermore, in both limits of
vanishing kinetic energy and subsequent vanishing magnetic field, the
Chern-Simons term leads to this system having non-trivial dynamics again, and
the dominant value of the lowest orbital angular momentum being $\hbar/4$,
which is a clear signal of spatial noncommutativity. An experimental
verification of this prediction by a Stern-Gerlach-type experiment is
suggested.
| [
{
"created": "Sat, 23 Dec 2006 02:17:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zhang",
"Jian-Zu",
""
]
] | The possibility of testing spatial noncommutativity in the case of both position-position and momentum-momentum noncommuting via a Chern-Simons' process is explored. A Chern-Simons process can be realized by an interaction of a charged particle in special crossed electric and magnetic fields, in which the Chern-Simons term leads to non-trivial dynamics in the limit of vanishing kinetic energy. Spatial noncommutativity leads to the spectrum of the orbital angular momentum possessing fractional values. Furthermore, in both limits of vanishing kinetic energy and subsequent vanishing magnetic field, the Chern-Simons term leads to this system having non-trivial dynamics again, and the dominant value of the lowest orbital angular momentum being $\hbar/4$, which is a clear signal of spatial noncommutativity. An experimental verification of this prediction by a Stern-Gerlach-type experiment is suggested. |
hep-ph/0204041 | B. Kyae | Bumseok Kyae, Qaisar Shafi | Non-universal Soft Parameters in Brane World and the Flavor Problem in
Supergravity | 1+22 pages, Version to appear in PRD with additional comments and
references | Phys.Rev.D66:095009,2002 | 10.1103/PhysRevD.66.095009 | BA-02-08 | hep-ph hep-th | null | We consider gravity mediated supersymmetry (SUSY) breaking in 5D spacetime
with two 4D branes B1 and B2 separated in the extra dimension. Using an
off-shell 5D supergravity (SUGRA) formalism, we argue that the SUSY breaking
scales could be non-universal even at the fundamental scale in a brane world
setting, since SUSY breaking effects could be effectively localized. As an
application, we suggest a model in which the two light chiral MSSM generations
reside on B1, while the third generation is located on B2, and the Higgs
multiplets as well as gravity and gauge multiplets reside in the bulk. For SUSY
breaking of the order of 10--20 TeV caused by a hidden sector localized at B1,
the scalars belonging to the first two generations can become sufficiently
heavy to overcome the SUSY flavor problem. SUSY breaking on B2 from a different
localized hidden sector gives rise to the third generation soft scalar masses
of the order of 1 TeV. Gaugino masses are also of the order of 1 TeV if the
size of the extra dimension is $\sim 10^{-16}$ ${\rm GeV}^{-1}$. As in 4D
effective supersymmetric theory, an adjustment of TeV scale parameters is
needed to realize the 100 GeV electroweak symmetry breaking scale.
| [
{
"created": "Wed, 3 Apr 2002 17:14:02 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 2002 16:12:29 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Kyae",
"Bumseok",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We consider gravity mediated supersymmetry (SUSY) breaking in 5D spacetime with two 4D branes B1 and B2 separated in the extra dimension. Using an off-shell 5D supergravity (SUGRA) formalism, we argue that the SUSY breaking scales could be non-universal even at the fundamental scale in a brane world setting, since SUSY breaking effects could be effectively localized. As an application, we suggest a model in which the two light chiral MSSM generations reside on B1, while the third generation is located on B2, and the Higgs multiplets as well as gravity and gauge multiplets reside in the bulk. For SUSY breaking of the order of 10--20 TeV caused by a hidden sector localized at B1, the scalars belonging to the first two generations can become sufficiently heavy to overcome the SUSY flavor problem. SUSY breaking on B2 from a different localized hidden sector gives rise to the third generation soft scalar masses of the order of 1 TeV. Gaugino masses are also of the order of 1 TeV if the size of the extra dimension is $\sim 10^{-16}$ ${\rm GeV}^{-1}$. As in 4D effective supersymmetric theory, an adjustment of TeV scale parameters is needed to realize the 100 GeV electroweak symmetry breaking scale. |
hep-ph/9911285 | Sebastien Descotes | Sebastien Descotes (IPN-Orsay) | Chiral symmetry and spectrum of Euclidean Dirac operator | 6 pages, no figure, class file included. Talk given at the XVII
International School of Physics "QCD: Perturbative or Nonperturbative",
Lisbon, Portugal, 29 September - 4 October 1999, to appear in the Proceedings | null | null | IPNO-DR/99-28 | hep-ph hep-lat | null | After recalling some connections between the Spontaneous Breakdown of Chiral
Symmetry (SBChS) and the spectrum of the Dirac operator for Euclidean QCD on a
torus, we use this tool to reconsider two related issues : the Zweig rule
violation in the scalar channel and the dependence of SBChS order parameters on
the number N_f of massless flavours. The latter would result into a great
variety of SBChS patterns in the (N_f,N_c) plane, which could be studied
through so-called Leutwyler-Smilga sum rules in association with lattice
computations of the Dirac spectrum.
| [
{
"created": "Tue, 9 Nov 1999 14:38:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Descotes",
"Sebastien",
"",
"IPN-Orsay"
]
] | After recalling some connections between the Spontaneous Breakdown of Chiral Symmetry (SBChS) and the spectrum of the Dirac operator for Euclidean QCD on a torus, we use this tool to reconsider two related issues : the Zweig rule violation in the scalar channel and the dependence of SBChS order parameters on the number N_f of massless flavours. The latter would result into a great variety of SBChS patterns in the (N_f,N_c) plane, which could be studied through so-called Leutwyler-Smilga sum rules in association with lattice computations of the Dirac spectrum. |
1812.01520 | Luis Anchordoqui | Luis A. Anchordoqui and Ignatios Antoniadis | Supersymmetric sphaleron configurations as the origin of the perplexing
ANITA events | Matching version accepted for publication in PLB | null | 10.1016/j.physletb.2019.02.003 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ANITA experiment has observed two air shower events with energy ~ 500 PeV
emerging from the Earth with exit angles of ~ 30 degrees. We explain ANITA
events as arising from neutrino-induced supersymmetric sphaleron transitions.
These high-multiplicity configurations could contain a large number of
long-lived supersymmetric fermions, which can traverse the Earth and decay in
the atmosphere to initiate upward-pointing air showers at large angles above
the horizon. We comment on the sensitivity of new generation LHC detectors,
designed to searching for displaced decays of beyond standard model long-lived
particles, to test our model.
| [
{
"created": "Tue, 4 Dec 2018 16:46:55 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2019 16:40:48 GMT",
"version": "v2"
}
] | 2019-02-13 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Antoniadis",
"Ignatios",
""
]
] | The ANITA experiment has observed two air shower events with energy ~ 500 PeV emerging from the Earth with exit angles of ~ 30 degrees. We explain ANITA events as arising from neutrino-induced supersymmetric sphaleron transitions. These high-multiplicity configurations could contain a large number of long-lived supersymmetric fermions, which can traverse the Earth and decay in the atmosphere to initiate upward-pointing air showers at large angles above the horizon. We comment on the sensitivity of new generation LHC detectors, designed to searching for displaced decays of beyond standard model long-lived particles, to test our model. |
hep-ph/9609434 | Thomas | Savas Dimopoulos, Scott Thomas, James D. Wells | Sparticle Spectroscopy and Electroweak Symmetry Breaking with
Gauge-Mediated Supersymmetry Breaking | 59 pages, Latex, published version | Nucl.Phys. B488 (1997) 39-91 | 10.1016/S0550-3213(97)00030-8 | SLAC-PUB-7237 | hep-ph hep-ex | null | The phenomenology associated with gauge-mediated supersymmetry breaking is
presented. A renormalization group analysis of the minimal model is performed
in which the constraints of radiative electroweak symmetry breaking are
imposed. The resulting superpartner and Higgs boson spectra are highly
correlated and depend on only a few parameters. Superpartner mass ratios and
sum rules are identified which can be tested at future colliders. Some of these
relations are logarithmically sensitive to the messenger scale, while others
allow gauge-mediation to be distinguished from other schemes for tansmitting
supersymmetry breaking. Deviations from the minimal model, such as larger
messenger representations and additional contributions to Higgs sector masses,
can in some circumstances dramatically modify the low energy spectrum. These
modifications include a slepton or Higgsino as the lightest standard model
superpartner, or exotic mass relations among the scalars and gauginos. The
contribution to $b \to s \gamma$ and resulting bound on superpartner masses are
also presented for the minimal model. Finally, the unique collider signatures
of heavy charged particle production, or decay to the Goldstino within a
detector are discussed.
| [
{
"created": "Mon, 23 Sep 1996 04:02:18 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 1996 23:03:48 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Dimopoulos",
"Savas",
""
],
[
"Thomas",
"Scott",
""
],
[
"Wells",
"James D.",
""
]
] | The phenomenology associated with gauge-mediated supersymmetry breaking is presented. A renormalization group analysis of the minimal model is performed in which the constraints of radiative electroweak symmetry breaking are imposed. The resulting superpartner and Higgs boson spectra are highly correlated and depend on only a few parameters. Superpartner mass ratios and sum rules are identified which can be tested at future colliders. Some of these relations are logarithmically sensitive to the messenger scale, while others allow gauge-mediation to be distinguished from other schemes for tansmitting supersymmetry breaking. Deviations from the minimal model, such as larger messenger representations and additional contributions to Higgs sector masses, can in some circumstances dramatically modify the low energy spectrum. These modifications include a slepton or Higgsino as the lightest standard model superpartner, or exotic mass relations among the scalars and gauginos. The contribution to $b \to s \gamma$ and resulting bound on superpartner masses are also presented for the minimal model. Finally, the unique collider signatures of heavy charged particle production, or decay to the Goldstino within a detector are discussed. |
2110.00021 | Manoranjan Dutta | Debasish Borah (1), Manoranjan Dutta (2), Satyabrata Mahapatra (2),
Narendra Sahu (2) ((1) Indian Institute of Technology Guwahati, (2) Indian
Institute of Technology Hyderabad) | Self-interacting Dark Matter via Right Handed Neutrino Portal | 48 pages, 21 captioned figures, version accepted for publication in
PRD | null | 10.1103/PhysRevD.105.015004 | null | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | We propose a self-interacting dark matter (DM) scenario with right handed
neutrino (RHN) portal to the standard model (SM). The dark sector consists of a
particle DM, assumed to be a Dirac fermion, and a light mediator in terms of a
dark Abelian vector boson to give rise to the required velocity dependent
self-interactions in agreement with astrophysical observations. Irrespective of
thermal or non-thermal production of such a DM, its final relic remains
under-abundant due to efficient annihilation rates of DM into light mediators
by virtue of large self-interaction coupling. We then show that a feeble portal
of DM-SM interaction via RHN offers a possibility to fill the relic deficit of
DM via the late decay of RHN. As RHN also arises naturally in seesaw models
explaining the origin of light neutrino masses, we outline two UV complete
realizations of the minimal setup in terms of scotogenic and gauged B-L
frameworks where connection to neutrino mass and other phenomenology like
complementary discovery prospects are discussed.
| [
{
"created": "Thu, 30 Sep 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Dec 2021 18:08:05 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Borah",
"Debasish",
""
],
[
"Dutta",
"Manoranjan",
""
],
[
"Mahapatra",
"Satyabrata",
""
],
[
"Sahu",
"Narendra",
""
]
] | We propose a self-interacting dark matter (DM) scenario with right handed neutrino (RHN) portal to the standard model (SM). The dark sector consists of a particle DM, assumed to be a Dirac fermion, and a light mediator in terms of a dark Abelian vector boson to give rise to the required velocity dependent self-interactions in agreement with astrophysical observations. Irrespective of thermal or non-thermal production of such a DM, its final relic remains under-abundant due to efficient annihilation rates of DM into light mediators by virtue of large self-interaction coupling. We then show that a feeble portal of DM-SM interaction via RHN offers a possibility to fill the relic deficit of DM via the late decay of RHN. As RHN also arises naturally in seesaw models explaining the origin of light neutrino masses, we outline two UV complete realizations of the minimal setup in terms of scotogenic and gauged B-L frameworks where connection to neutrino mass and other phenomenology like complementary discovery prospects are discussed. |
0812.2173 | George Japaridze | G. Japaridze | How the relation e^2/4pi = 1/137 may be obtained in the framework of
Quantum Electrodynamics | null | null | null | null | hep-ph physics.gen-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this pedagogical note it is demonstrated how the numeric value of fine
structure constant may be established by comparing results following from the
calculations in the framework of Quantum Electrodynamics with the experimental
data. As an observable, the coefficient of 1/r in the Coulomb law is used.
| [
{
"created": "Thu, 11 Dec 2008 15:27:18 GMT",
"version": "v1"
}
] | 2008-12-12 | [
[
"Japaridze",
"G.",
""
]
] | In this pedagogical note it is demonstrated how the numeric value of fine structure constant may be established by comparing results following from the calculations in the framework of Quantum Electrodynamics with the experimental data. As an observable, the coefficient of 1/r in the Coulomb law is used. |
1005.0547 | Keisho Hidaka | K. Hidaka (Tokyo Gakugei U.) | Impact of squark generation mixing on the search for gluinos at LHC | Parallel talk at SUSY09, Boston, USA, June 2009, 4 pages, 1 figure | AIP Conf.Proc.1200:421-424,2010 | 10.1063/1.3327606 | TGU-38 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of squark-generation mixing on gluino decays in the
Minimal Supersymmetric Standard Model (MSSM). We show that due to the effect
the quark-flavor violating (QFV) gluino decay branching ratio B(gluino -> c
bar{t} (t bar{c}) + neutralino_1) can be very large (up to ~50%) in a
significant part of the MSSM parameter space despite the very strong
experimental constraints on QFV from B meson observables. This could have an
important impact on the search for gluinos and the determination of the MSSM
parameters at LHC.
| [
{
"created": "Tue, 4 May 2010 15:07:56 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Hidaka",
"K.",
"",
"Tokyo Gakugei U."
]
] | We study the effect of squark-generation mixing on gluino decays in the Minimal Supersymmetric Standard Model (MSSM). We show that due to the effect the quark-flavor violating (QFV) gluino decay branching ratio B(gluino -> c bar{t} (t bar{c}) + neutralino_1) can be very large (up to ~50%) in a significant part of the MSSM parameter space despite the very strong experimental constraints on QFV from B meson observables. This could have an important impact on the search for gluinos and the determination of the MSSM parameters at LHC. |
1801.10350 | Aaron Park | Aaron Park, Woosung Park, Su Houng Lee | Tribaryon configurations and the inevitable three nucleon repulsions at
short distance | 5 pages, 1 figure, version to be published in prd | Phys. Rev. D 98, 034001 (2018) | 10.1103/PhysRevD.98.034001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We decompose the tribaryon configuration in terms of SU(3) flavor and spin
state and analyse their color-spin-flavor wave function following Pauli
principle. By comparing the color-color and color-spin interactions of compact
tribaryon configuration against the lowest three nucleon threshold within a
constituent quark model, we show that the three nucleon forces have to be
repulsive at short distance for all possible quantum numbers and all values of
the SU(3) symmetry breaking parameter. Our work identifies the origin of the
repulsive nuclear three body forces including the hyperons at short distance
that are called for from phenomenological considerations starting from nuclear
matter to the maximum mass of a neutron star.
| [
{
"created": "Wed, 31 Jan 2018 08:42:02 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Aug 2018 11:53:41 GMT",
"version": "v2"
}
] | 2018-08-08 | [
[
"Park",
"Aaron",
""
],
[
"Park",
"Woosung",
""
],
[
"Lee",
"Su Houng",
""
]
] | We decompose the tribaryon configuration in terms of SU(3) flavor and spin state and analyse their color-spin-flavor wave function following Pauli principle. By comparing the color-color and color-spin interactions of compact tribaryon configuration against the lowest three nucleon threshold within a constituent quark model, we show that the three nucleon forces have to be repulsive at short distance for all possible quantum numbers and all values of the SU(3) symmetry breaking parameter. Our work identifies the origin of the repulsive nuclear three body forces including the hyperons at short distance that are called for from phenomenological considerations starting from nuclear matter to the maximum mass of a neutron star. |
hep-ph/9703400 | Misha Eides | Michael I. Eides (Petersburg Nuclear Physics Institute, Russia, and
Pennsylvania State University, USA) and Howard Grotch (Pennsylvania State
University, USA) | Gyromagnetic Ratios of Bound Particles | 10 pages, RevTeX | Annals Phys. 260 (1997) 191 | 10.1006/aphy.1997.5725 | PSU/TH/181 | hep-ph | null | A new approach to calculation of the binding corrections to the magnetic
moments of the constituents in a loosely bound system, based on the
Bargmann-Michel-Telegdi equation, is suggested. Binding corrections are
calculated in this framework, and the results confirm earlier calculations
performed by other methods. Our method clearly demonstrates independence of the
binding corrections on the magnitude of the spin of the constituents.
| [
{
"created": "Mon, 24 Mar 1997 16:33:15 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Eides",
"Michael I.",
"",
"Petersburg Nuclear Physics Institute, Russia, and\n Pennsylvania State University, USA"
],
[
"Grotch",
"Howard",
"",
"Pennsylvania State\n University, USA"
]
] | A new approach to calculation of the binding corrections to the magnetic moments of the constituents in a loosely bound system, based on the Bargmann-Michel-Telegdi equation, is suggested. Binding corrections are calculated in this framework, and the results confirm earlier calculations performed by other methods. Our method clearly demonstrates independence of the binding corrections on the magnitude of the spin of the constituents. |
hep-ph/9412378 | null | A. E. Dorokhov, N. I. Kochelev, Yu. A. Zubov | Four-Quark States and Nucleon-Antinucleon Annihilation within the Quark
Model with Instanton Induced Interaction | 28 pages, latex, 4 figures (one figure is available by request) | Z.Phys.C65:667-680,1995 | 10.1007/BF01578674 | JINR E2-93-117 | hep-ph | null | The spectrum of $q^2\bar q^2, J^p=0^+,2^+$ mesons is discussed. We have shown
that due to instanton - induced forces the physical states are strong mixtures
of the $SU_f(3)$ group basis states. The cross-sections for annihilation of the
$N\bar N$ system into $(q^2\bar q^2)(q\bar q)$ mesons are obtained. The
$a_0(980)$ meson is considered as $q^2\bar q^2$ meson consisting of $9_f$ and
$36_f$ plets. The branchings are also predicted for the cross-sections for
production of the $a_0(980)$ and tensor $q^2\bar q^2$ mesons in $N\bar N$
annihilation.
| [
{
"created": "Wed, 28 Dec 1994 12:03:21 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Dorokhov",
"A. E.",
""
],
[
"Kochelev",
"N. I.",
""
],
[
"Zubov",
"Yu. A.",
""
]
] | The spectrum of $q^2\bar q^2, J^p=0^+,2^+$ mesons is discussed. We have shown that due to instanton - induced forces the physical states are strong mixtures of the $SU_f(3)$ group basis states. The cross-sections for annihilation of the $N\bar N$ system into $(q^2\bar q^2)(q\bar q)$ mesons are obtained. The $a_0(980)$ meson is considered as $q^2\bar q^2$ meson consisting of $9_f$ and $36_f$ plets. The branchings are also predicted for the cross-sections for production of the $a_0(980)$ and tensor $q^2\bar q^2$ mesons in $N\bar N$ annihilation. |
1902.00527 | Nodoka Yamanaka | Nodoka Yamanaka | Enhancements and suppressions of CP violating effect in the nucleons,
nuclei, and atoms | 11 pages, 4 figures, short review on the electric dipole moment,
proceedings of the 23rd International Spin Symposium (SPIN 2018), September
10-14, 2018 | null | null | null | hep-ph hep-ex nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electric dipole moment (EDM) is a very sensitive probe of CP violation
beyond the standard model, and it as been measured in many systems such as
atoms, neutrons, etc. The EDM of composite systems may be sensitive to several
elementary level CP violating processes, but the theoretical evaluations of the
CP violation at different physical (atomic, nuclear, hadronic, elementary)
hierarchies are required to unveil them. In this context, we are particularly
interested in which CP violating processes are enhanced in a given system, or
vice versa. In this proceedings contribution, we will give an overview of the
enhancement and suppression of CP violation in processes contributing to the
EDMs of composite systems.
| [
{
"created": "Fri, 1 Feb 2019 19:17:06 GMT",
"version": "v1"
}
] | 2019-02-05 | [
[
"Yamanaka",
"Nodoka",
""
]
] | The electric dipole moment (EDM) is a very sensitive probe of CP violation beyond the standard model, and it as been measured in many systems such as atoms, neutrons, etc. The EDM of composite systems may be sensitive to several elementary level CP violating processes, but the theoretical evaluations of the CP violation at different physical (atomic, nuclear, hadronic, elementary) hierarchies are required to unveil them. In this context, we are particularly interested in which CP violating processes are enhanced in a given system, or vice versa. In this proceedings contribution, we will give an overview of the enhancement and suppression of CP violation in processes contributing to the EDMs of composite systems. |
1106.3076 | Matthew Schwartz | Jason Gallicchio, Matthew D. Schwartz | Quark and Gluon Tagging at the LHC | 5 pages, 3 figures. v2 published version | Phys.Rev.Lett. 107 (2011) 172001 | 10.1103/PhysRevLett.107.172001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Being able to distinguish light-quark jets from gluon jets on an
event-by-event basis could significantly enhance the reach for many new physics
searches at the Large Hadron Collider. Through an exhaustive search of existing
and novel jet substructure observables, we find that a multivariate approach
can filter out over 95% of the gluon jets while keeping more than half of the
light-quark jets. Moreover, a combination of two simple variables, the charge
track multiplicity and the $p_T$-weighted linear radial moment (girth), can
achieve similar results. While this pair appears very promising, our study is
only Monte Carlo based, and other discriminants may work better with real data
in a realistic experimental environment. To that end, we explore many other
observables constructed using different jet sizes and parameters, and highlight
those that deserve further theoretical and experimental scrutiny. Additional
information, including distributions of around 10,000 variables, can be found
on this website http://jets.physics.harvard.edu/qvg .
| [
{
"created": "Wed, 15 Jun 2011 20:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2011 21:48:06 GMT",
"version": "v2"
}
] | 2013-04-15 | [
[
"Gallicchio",
"Jason",
""
],
[
"Schwartz",
"Matthew D.",
""
]
] | Being able to distinguish light-quark jets from gluon jets on an event-by-event basis could significantly enhance the reach for many new physics searches at the Large Hadron Collider. Through an exhaustive search of existing and novel jet substructure observables, we find that a multivariate approach can filter out over 95% of the gluon jets while keeping more than half of the light-quark jets. Moreover, a combination of two simple variables, the charge track multiplicity and the $p_T$-weighted linear radial moment (girth), can achieve similar results. While this pair appears very promising, our study is only Monte Carlo based, and other discriminants may work better with real data in a realistic experimental environment. To that end, we explore many other observables constructed using different jet sizes and parameters, and highlight those that deserve further theoretical and experimental scrutiny. Additional information, including distributions of around 10,000 variables, can be found on this website http://jets.physics.harvard.edu/qvg . |
hep-ph/9809595 | Carl Carlson | Carl E. Carlson (W & M) | Perturbative QCD Applied to Baryons | 8 pages, 6 figures, Talk given at the Trento Workshop on
Nonperturbative Methods in Baryon Physics, May 1998 | Few Body Syst.Suppl.11:10-17,1999 | null | WM-98-116 | hep-ph | null | We review standard applications of perturbative QCD to baryon production, and
argue by examining data that it is generally relevant at high but
experimentally feasible momentum transfers. Then we consider some new
initiatives, particularly meson photoproduction off baryons and the seeming
quagmire of Delta(1232) electroproduction.
| [
{
"created": "Wed, 30 Sep 1998 16:24:18 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Carlson",
"Carl E.",
"",
"W & M"
]
] | We review standard applications of perturbative QCD to baryon production, and argue by examining data that it is generally relevant at high but experimentally feasible momentum transfers. Then we consider some new initiatives, particularly meson photoproduction off baryons and the seeming quagmire of Delta(1232) electroproduction. |
hep-ph/0703190 | Harry Lipkin J | Harry J. Lipkin | Exotic Hadrons in the Constituent Quark Model | 8 pages | Prog.Theor.Phys.Suppl.168:15-22,2007 | 10.1143/PTPS.168.15 | WIS/05/07-MARCH-DPP, TAUP 2851/07,ANL-HEP-CP-07-16 | hep-ph | null | Exotic hadrons are important because their existence or absence can provide
important clues to understanding how QCD makes hadrons from quarks and gluons.
The first experimentally confirmed exotic will be the first hadron containing
both $qq$ and $\bar q q$ pairs and the first hadron containing color sextet and
color octet pairs. Theoretical models are not very useful because there is no
accepted model for multiquark systems with color-space correlations. The
constituent quark model is the only phenomenological model with predictive
power that has given experimentally tested universal predictions for both
mesons and baryons. This paper reviews its explanation for why there are no
bound exotics and its guidance to the search for heavy-flavored exotic
tetraquarks and pentaquarks. A possible supersymmetry between mesons and
baryons leading to meson-baryon mass relations not easily obtained otherwise is
discussed.
| [
{
"created": "Sun, 18 Mar 2007 14:30:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lipkin",
"Harry J.",
""
]
] | Exotic hadrons are important because their existence or absence can provide important clues to understanding how QCD makes hadrons from quarks and gluons. The first experimentally confirmed exotic will be the first hadron containing both $qq$ and $\bar q q$ pairs and the first hadron containing color sextet and color octet pairs. Theoretical models are not very useful because there is no accepted model for multiquark systems with color-space correlations. The constituent quark model is the only phenomenological model with predictive power that has given experimentally tested universal predictions for both mesons and baryons. This paper reviews its explanation for why there are no bound exotics and its guidance to the search for heavy-flavored exotic tetraquarks and pentaquarks. A possible supersymmetry between mesons and baryons leading to meson-baryon mass relations not easily obtained otherwise is discussed. |
2310.13837 | Kre\v{s}imir Kumeri\v{c}ki | Marija \v{C}ui\'c, Goran Duplan\v{c}i\'c, Kre\v{s}imir Kumeri\v{c}ki,
Kornelija Passek-K. | NLO corrections to the deeply virtual meson production revisited: impact
on the extraction of generalized parton distributions | 36 pages, 13 figures, small corrections, refs added, matches
published version + erratum | JHEP 12 (2023) 192; Erratum: JHEP 02 (2024) 225 | 10.1007/JHEP12(2023)192 10.1007/JHEP02(2024)225 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the next-to-leading order (NLO) perturbative QCD corrections for
the deeply virtual meson production (DVMP) process, exploring its phenomenology
both in isolation and in a multichannel fit combined with deeply virtual
Compton scattering (DVCS). Our approach involves the conformal partial wave
(CPaW) formalism, which allows for the straightforward inclusion of
higher-order contributions and evolutionary effects. Our findings indicate that
a description of the longitudinal component of the vector meson DVMP
cross-section at high energies is achievable only at NLO within the standard
collinear approach. Furthermore, we demonstrate a simultaneous description of
DIS, DVCS, and DVMP processes, providing insights into the proton structure
described at NLO by unique universal generalized parton distribution (GPD)
functions.
| [
{
"created": "Fri, 20 Oct 2023 22:24:35 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2024 18:36:16 GMT",
"version": "v2"
}
] | 2024-03-15 | [
[
"Čuić",
"Marija",
""
],
[
"Duplančić",
"Goran",
""
],
[
"Kumerički",
"Krešimir",
""
],
[
"Passek-K.",
"Kornelija",
""
]
] | We revisit the next-to-leading order (NLO) perturbative QCD corrections for the deeply virtual meson production (DVMP) process, exploring its phenomenology both in isolation and in a multichannel fit combined with deeply virtual Compton scattering (DVCS). Our approach involves the conformal partial wave (CPaW) formalism, which allows for the straightforward inclusion of higher-order contributions and evolutionary effects. Our findings indicate that a description of the longitudinal component of the vector meson DVMP cross-section at high energies is achievable only at NLO within the standard collinear approach. Furthermore, we demonstrate a simultaneous description of DIS, DVCS, and DVMP processes, providing insights into the proton structure described at NLO by unique universal generalized parton distribution (GPD) functions. |
1706.08851 | Vishnudath K. N. | Ila Garg, Srubabati Goswami, Vishnudath K. N. and Najimuddin Khan | Electroweak vacuum stability in presence of singlet scalar dark matter
in TeV scale seesaw models | 35 pages, 15 figures | Phys. Rev. D 96, 055020 (2017) | 10.1103/PhysRevD.96.055020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider singlet extensions of the standard model, both in the fermion and
the scalar sector, to account for the generation of neutrino mass at the TeV
scale and the existence of dark matter respectively. For the neutrino sector we
consider models with extra singlet fermions which can generate neutrino mass
via the so called inverse or linear seesaw mechanism whereas a singlet scalar
is introduced as the candidate for dark matter. We show that although these two
sectors are disconnected at low energy, the coupling constants of both the
sectors get correlated at high energy scale by the constraints coming from the
perturbativity and stability/metastability of the electroweak vacuum. The
singlet fermions try to destabilize the electroweak vacuum while the singlet
scalar aids the stability. As an upshot, the electroweak vacuum may attain
absolute stability even upto the Planck scale for suitable values of the
parameters. We delineate the parameter space for the singlet fermion and the
scalar couplings for which the electroweak vacuum remains stable/metastable and
at the same time giving the correct relic density and neutrino masses and
mixing angles as observed.
| [
{
"created": "Tue, 27 Jun 2017 13:51:53 GMT",
"version": "v1"
}
] | 2017-09-20 | [
[
"Garg",
"Ila",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"N.",
"Vishnudath K.",
""
],
[
"Khan",
"Najimuddin",
""
]
] | We consider singlet extensions of the standard model, both in the fermion and the scalar sector, to account for the generation of neutrino mass at the TeV scale and the existence of dark matter respectively. For the neutrino sector we consider models with extra singlet fermions which can generate neutrino mass via the so called inverse or linear seesaw mechanism whereas a singlet scalar is introduced as the candidate for dark matter. We show that although these two sectors are disconnected at low energy, the coupling constants of both the sectors get correlated at high energy scale by the constraints coming from the perturbativity and stability/metastability of the electroweak vacuum. The singlet fermions try to destabilize the electroweak vacuum while the singlet scalar aids the stability. As an upshot, the electroweak vacuum may attain absolute stability even upto the Planck scale for suitable values of the parameters. We delineate the parameter space for the singlet fermion and the scalar couplings for which the electroweak vacuum remains stable/metastable and at the same time giving the correct relic density and neutrino masses and mixing angles as observed. |
1010.2089 | Richard Neufeld Jr. | R.B. Neufeld | Tagged jets and jet reconstruction as a probe of QGP induced partonic
energy loss | Proceedings for the Jets in Proton-Proton and Heavy-Ion Collisions
Workshop held in Prague this August. 5 pages and 4 figures | null | 10.1142/S0218301311019957 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent experimental advances at the Relativistic Heavy Ion Collider (RHIC)
and the large center-of-mass energies available to the heavy-ion program at the
Large Hadron Collider (LHC) will enable strongly interacting matter at high
temperatures and densities, that is, the quark-gluon plasma (QGP), to be probed
in unprecedented ways. Among these exciting new probes are fully-reconstructed
inclusive jets and the away-side hadron showers associated with a weakly or
electromagnetically interacting boson, or, tagged jets. Full jet reconstruction
provides an experimental window into the mechanisms of quark and gluon dynamics
in the QGP which is not accessible via leading particles and leading particle
correlations. Theoretical advances in this growing field can help resolve some
of the most controversial points in heavy ion physics today. I here discuss the
power of jets to reveal the spectrum of induced radiation, thereby shedding
light on the applicability of the commonly used energy loss formalisms and
present results on the production and subsequent suppression of high energy
jets tagged with Z bosons in relativistic heavy-ion collisions at RHIC and LHC
energies using the Gyulassy-Levai-Vitev (GLV) parton energy loss approach.
| [
{
"created": "Mon, 11 Oct 2010 12:56:12 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2010 23:01:07 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Neufeld",
"R. B.",
""
]
] | Recent experimental advances at the Relativistic Heavy Ion Collider (RHIC) and the large center-of-mass energies available to the heavy-ion program at the Large Hadron Collider (LHC) will enable strongly interacting matter at high temperatures and densities, that is, the quark-gluon plasma (QGP), to be probed in unprecedented ways. Among these exciting new probes are fully-reconstructed inclusive jets and the away-side hadron showers associated with a weakly or electromagnetically interacting boson, or, tagged jets. Full jet reconstruction provides an experimental window into the mechanisms of quark and gluon dynamics in the QGP which is not accessible via leading particles and leading particle correlations. Theoretical advances in this growing field can help resolve some of the most controversial points in heavy ion physics today. I here discuss the power of jets to reveal the spectrum of induced radiation, thereby shedding light on the applicability of the commonly used energy loss formalisms and present results on the production and subsequent suppression of high energy jets tagged with Z bosons in relativistic heavy-ion collisions at RHIC and LHC energies using the Gyulassy-Levai-Vitev (GLV) parton energy loss approach. |
hep-ph/9406280 | null | Marco Aurelio Diaz | Constraints on Supergravity in the Light Gluino Scenario | 14 pages (plain tex), 4 figures not included, VAND-TH-94-11.
Presented in the International Symposium ``Physics Doesn't Stop: Recent
Developments in Phenomenology'', University of Wisconsin, Madison WI, April
11-13, 1994 | null | null | null | hep-ph | null | Minimal $N=1$ supergravity with a radiatively broken electroweak symmetry
group is studied in the light gluino scenario. Constraints from the
$b\rightarrow s\gamma$ decay and from the masses of the light CP-even neutral
Higgs $m_h$, the lightest chargino $m_{\chi^{\pm}_1}$, and the second lightest
neutralino $m_{\chi^0_2}$ are analyzed. We consider models in which the
relation $A=B+m_0$ holds. We plot the allowed region in the $\tan\beta-\mu$
plane consistent with chargino/neutralino searches, and an upper bound on
$\tan\beta$ given by 1.82 (1.85) for $\mu>0$ ($\mu<0$) is found. We analize the
consistency of this upper bound with experimental constraints on the lightest
Higgs mass. We find that a gluino with a mass of a few GeV is incompatible with
this kind of models.
| [
{
"created": "Fri, 10 Jun 1994 15:38:09 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Diaz",
"Marco Aurelio",
""
]
] | Minimal $N=1$ supergravity with a radiatively broken electroweak symmetry group is studied in the light gluino scenario. Constraints from the $b\rightarrow s\gamma$ decay and from the masses of the light CP-even neutral Higgs $m_h$, the lightest chargino $m_{\chi^{\pm}_1}$, and the second lightest neutralino $m_{\chi^0_2}$ are analyzed. We consider models in which the relation $A=B+m_0$ holds. We plot the allowed region in the $\tan\beta-\mu$ plane consistent with chargino/neutralino searches, and an upper bound on $\tan\beta$ given by 1.82 (1.85) for $\mu>0$ ($\mu<0$) is found. We analize the consistency of this upper bound with experimental constraints on the lightest Higgs mass. We find that a gluino with a mass of a few GeV is incompatible with this kind of models. |
1806.04029 | Cristiano Brenner Mariotto | C. Brenner Mariotto, V. P. Goncalves, R. Palota da Silva | Diffractive double quarkonium production at the LHC | 4 pages, 4 figures, 1 table. Poster presented at the XIV
International Workshop on Hadron Physics, Florian\'opolis, Brazil, March 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the inclusive and diffractive double quarkonium
production. Based on the nonrelativistic QCD (NRQCD) factorization formalism
for the quarkonium production mechanism we estimate the rapidity and transverse
momentum dependence of the cross section for the $J/\Psi J/\Psi$ and $\Upsilon
\Upsilon$ production in diffractive processes at LHC energies. The
contributions of the color-singlet and color-octet channels are estimated and
predictions for the total cross sections in the kinematical regions of the LHC
experiments are also presented. Our results demonstrate that the contribution
of diffractive processes is not negligible and that its study can be useful to
test the Resolved Pomeron model.
| [
{
"created": "Mon, 11 Jun 2018 14:51:25 GMT",
"version": "v1"
}
] | 2018-06-12 | [
[
"Mariotto",
"C. Brenner",
""
],
[
"Goncalves",
"V. P.",
""
],
[
"da Silva",
"R. Palota",
""
]
] | In this paper we study the inclusive and diffractive double quarkonium production. Based on the nonrelativistic QCD (NRQCD) factorization formalism for the quarkonium production mechanism we estimate the rapidity and transverse momentum dependence of the cross section for the $J/\Psi J/\Psi$ and $\Upsilon \Upsilon$ production in diffractive processes at LHC energies. The contributions of the color-singlet and color-octet channels are estimated and predictions for the total cross sections in the kinematical regions of the LHC experiments are also presented. Our results demonstrate that the contribution of diffractive processes is not negligible and that its study can be useful to test the Resolved Pomeron model. |
1405.3581 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the $Z(4430)$ as the first radial excitation of the
$Z_c(3900)$ | 11 pages, 4 figures | Commun.Theor.Phys.63(2015)325 | 10.1088/0253-6102/63/3/325 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we take the $Z_c(3900)$ and $Z(4430)$ as the ground state
and the first radial excited state of the axial-vector tetraquark states with
$J^{PC}=1^{+-}$, respectively, and study their masses and pole residues with
the QCD sum rules by calculating the contributions of the vacuum condensates up
to dimension-10 in a consistent way in the operator product expansion. The
numerical result favors assigning the $Z_c(3900)$ and $Z(4430)$ as the ground
state and first radial excited state of the axial-vector tetraquark states,
respectively.
| [
{
"created": "Mon, 12 May 2014 23:17:41 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jun 2014 13:59:14 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Dec 2014 03:33:35 GMT",
"version": "v3"
}
] | 2015-06-19 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we take the $Z_c(3900)$ and $Z(4430)$ as the ground state and the first radial excited state of the axial-vector tetraquark states with $J^{PC}=1^{+-}$, respectively, and study their masses and pole residues with the QCD sum rules by calculating the contributions of the vacuum condensates up to dimension-10 in a consistent way in the operator product expansion. The numerical result favors assigning the $Z_c(3900)$ and $Z(4430)$ as the ground state and first radial excited state of the axial-vector tetraquark states, respectively. |
2209.00505 | Roman Nevzorov | Roman Nevzorov | On the Suppression of the Dark Matter-Nucleon Scattering Cross Section
in the SE$_6$SSM | 22 pages, 2 figures | null | null | null | hep-ph astro-ph.CO gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the E6 inspired $U(1)_N$ extension of the minimal supersymmetric (SUSY)
standard model (MSSM) a single discrete $\tilde{Z}^{H}_2$ symmetry permits
suppressing rapid proton decay and non-diagonal flavour transitions. If matter
parity and $\tilde{Z}^{H}_2$ symmetry are preserved this SUSY model (SE4-6$SSM)
may involve two dark matter candidates. In this article we study a new
modification of the SE6SSM in which the cold dark matter is composed of
gravitino and the lightest neutral exotic fermion. We argue that in this case
the dark matter-nucleon scattering cross section can be considerably smaller
than the present experimental limit.
| [
{
"created": "Thu, 1 Sep 2022 14:46:41 GMT",
"version": "v1"
}
] | 2022-09-02 | [
[
"Nevzorov",
"Roman",
""
]
] | In the E6 inspired $U(1)_N$ extension of the minimal supersymmetric (SUSY) standard model (MSSM) a single discrete $\tilde{Z}^{H}_2$ symmetry permits suppressing rapid proton decay and non-diagonal flavour transitions. If matter parity and $\tilde{Z}^{H}_2$ symmetry are preserved this SUSY model (SE4-6$SSM) may involve two dark matter candidates. In this article we study a new modification of the SE6SSM in which the cold dark matter is composed of gravitino and the lightest neutral exotic fermion. We argue that in this case the dark matter-nucleon scattering cross section can be considerably smaller than the present experimental limit. |
0901.4310 | Gilberto Ramalho | G. Ramalho and M.T Pena | Valence quark contribution for the gamma N -> Delta quadrupole
transition extracted from lattice QCD | To appear in Phys. Rev. D | Phys.Rev.D80:013008,2009 | 10.1103/PhysRevD.80.013008 | JLAB-THY-09-940 | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting with a spectator quark model developed for the nucleon (N) and the
Delta in the physical pion mass region, we extend the predictions of the
reaction gamma N -> Delta to the lattice QCD regime. The quark model includes S
and D waves in the quark-diquark wavefunctions. Within this framework it is the
D-wave part in the Delta wavefunction that generates nonzero valence
contributions for the quadrupole form factors of the transition. Those
contributions are however insufficient to explain the physical data, since the
pion cloud contributions dominate. To separate the two effects we apply the
model to the lattice regime in a region where the pion cloud effects are
negligible, and adjust the D-state parameters directly to the lattice data.
This process allows us to obtain a better determination of the D-state
contributions. Finally, by adding a simple parametrization of the pion cloud we
establish the connection between the experimental data and the lattice data.
| [
{
"created": "Tue, 27 Jan 2009 18:55:37 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jul 2009 21:21:10 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Ramalho",
"G.",
""
],
[
"Pena",
"M. T",
""
]
] | Starting with a spectator quark model developed for the nucleon (N) and the Delta in the physical pion mass region, we extend the predictions of the reaction gamma N -> Delta to the lattice QCD regime. The quark model includes S and D waves in the quark-diquark wavefunctions. Within this framework it is the D-wave part in the Delta wavefunction that generates nonzero valence contributions for the quadrupole form factors of the transition. Those contributions are however insufficient to explain the physical data, since the pion cloud contributions dominate. To separate the two effects we apply the model to the lattice regime in a region where the pion cloud effects are negligible, and adjust the D-state parameters directly to the lattice data. This process allows us to obtain a better determination of the D-state contributions. Finally, by adding a simple parametrization of the pion cloud we establish the connection between the experimental data and the lattice data. |
hep-ph/9801313 | null | N. Rius | Symmetry Non-restoration at High Temperature | 8 pages, LaTex with sprocl.sty, 1 figure. To appear in the
Proceedings of the International Workshop ``Beyond the Standard Model: from
Theory to Experiment'' | null | 10.1142/9789814447263_0068 | null | hep-ph | null | We discuss the (non)-restoration of global and local symmetries at high
temperature. First, we analyze a two-scalar model with $Z_2 \times Z_2$
symmetry using the exact renormalization group. We conclude that inverse
symmetry breaking is possible in this kind of models within the perturbative
regime. Regarding local symmetries, we consider the $SU(2) \otimes U(1)$ gauge
symmetry and focus on the case of a strongly interacting scalar sector.
Employing a model-independent chiral Lagrangian we find indications of symmetry
restoration.
| [
{
"created": "Thu, 15 Jan 1998 14:32:13 GMT",
"version": "v1"
}
] | 2016-10-26 | [
[
"Rius",
"N.",
""
]
] | We discuss the (non)-restoration of global and local symmetries at high temperature. First, we analyze a two-scalar model with $Z_2 \times Z_2$ symmetry using the exact renormalization group. We conclude that inverse symmetry breaking is possible in this kind of models within the perturbative regime. Regarding local symmetries, we consider the $SU(2) \otimes U(1)$ gauge symmetry and focus on the case of a strongly interacting scalar sector. Employing a model-independent chiral Lagrangian we find indications of symmetry restoration. |
hep-ph/0101230 | Mariano Quiros | Mariano Quiros | Electroweak baryogenesis and the Higgs and stop masses | 10 pages, 6 figures, uses espcrc2.sty. Contribution to the
conferences: Strong Electroweak Matter, Centre de Physique Theorique,
Universite de Marseille, Marseilles (France), June 14-17, 2000; and, Thirty
years of supersymmetry, Theoretical Physics Institute, School of Physics and
Astronomy, Minneapolis, Minnesota (USA), October 16-27, 2000 | Nucl.Phys.Proc.Suppl.101:401-409,2001 | 10.1016/S0920-5632(01)01526-2 | IEM-FT-208/00 | hep-ph | null | In this talk we review the actual situation concerning electroweak phase
transition and baryogenesis in the minimal supersymmetric extension of the
Standard Model. A strong enough phase transition requires light Higgs and stop
eigenstates. For a Higgs mass in the range 110--115 GeV, there is a stop window
in the range 105--165 GeV. If the Higgs is heavier than 115 GeV, stronger
constrains are imposed on the space of supersymmetric parameters. A
baryon-to-entropy ratio is generated by the chargino sector provided that the
$\mu$ parameter has a CP-violating phase larger than $\sim$ 0.04.
| [
{
"created": "Sat, 20 Jan 2001 18:33:12 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Quiros",
"Mariano",
""
]
] | In this talk we review the actual situation concerning electroweak phase transition and baryogenesis in the minimal supersymmetric extension of the Standard Model. A strong enough phase transition requires light Higgs and stop eigenstates. For a Higgs mass in the range 110--115 GeV, there is a stop window in the range 105--165 GeV. If the Higgs is heavier than 115 GeV, stronger constrains are imposed on the space of supersymmetric parameters. A baryon-to-entropy ratio is generated by the chargino sector provided that the $\mu$ parameter has a CP-violating phase larger than $\sim$ 0.04. |
hep-ph/0012320 | Shima | Kazunari Shima | Supersymmetric structure of spacetime and matter -superon-graviton
model- | 15 pages, Latex | Phys.Lett. B501 (2001) 237-244 | 10.1016/S0370-2693(01)00121-6 | LMU-TPW-99/16 MPI-PhT/99-36 SIT-LP-99/08 (final version) | hep-ph | null | A unified description of spacetime and matter is proposed by using a single
irreducible representation of SO(10) Super-Poincare algebra(SO(10)SPA). All
(observed) elementary particles except the graviton are the (massless)
eigenstates of SO10)SPA composed of fundamental Nambu-Goldstone fermions with
spin 1/2, superons, associating with the spontaneous breakdown of the
supertranslation of the spacetime. The systematic investigations of the
standard model(SM) and SU(5)GUT by using superon diagrams may reveal the
generation structure, the stability of the proton, K-, B-, D- mixings,
CP-violation, the atmospheric and solar neutrino deficits and the absence of
the electroweak lepton-flavor-mixing. The fundamental action of the
superon-graviton model(SGM) for spacetime and matter is proposed, which is
invariant under a new supersymmetry.
| [
{
"created": "Sat, 23 Dec 2000 03:53:16 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Shima",
"Kazunari",
""
]
] | A unified description of spacetime and matter is proposed by using a single irreducible representation of SO(10) Super-Poincare algebra(SO(10)SPA). All (observed) elementary particles except the graviton are the (massless) eigenstates of SO10)SPA composed of fundamental Nambu-Goldstone fermions with spin 1/2, superons, associating with the spontaneous breakdown of the supertranslation of the spacetime. The systematic investigations of the standard model(SM) and SU(5)GUT by using superon diagrams may reveal the generation structure, the stability of the proton, K-, B-, D- mixings, CP-violation, the atmospheric and solar neutrino deficits and the absence of the electroweak lepton-flavor-mixing. The fundamental action of the superon-graviton model(SGM) for spacetime and matter is proposed, which is invariant under a new supersymmetry. |
0706.4381 | Xuguang Huang | Xuguang Huang, Qun Wang and Pengfei Zhuang | Neutrino Emission From Direct Urca Processes in Pion Condensed Quark
Matter | 12 pages,6 figures, published version | Phys.Rev.D76:094008,2007 | 10.1103/PhysRevD.76.094008 | null | hep-ph astro-ph nucl-th | null | We study neutrino emission from direct Urca processes in pion condensed quark
matter. In compact stars with high baryon density, the emission is dominated by
the gapless modes of the pion condensation which leads to an enhanced
emissivity. While for massless quarks the enhancement is not remarkable, the
emissivity is significantly larger and the cooling of the condensed matter is
considerably faster than that in normal quark matter when the mass difference
between $u$- and $d$-quarks is sizable.
| [
{
"created": "Fri, 29 Jun 2007 10:10:47 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2007 10:12:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Huang",
"Xuguang",
""
],
[
"Wang",
"Qun",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | We study neutrino emission from direct Urca processes in pion condensed quark matter. In compact stars with high baryon density, the emission is dominated by the gapless modes of the pion condensation which leads to an enhanced emissivity. While for massless quarks the enhancement is not remarkable, the emissivity is significantly larger and the cooling of the condensed matter is considerably faster than that in normal quark matter when the mass difference between $u$- and $d$-quarks is sizable. |
hep-ph/9605317 | Timo van Ritbergen | S.A. Larin, P. Nogueira, T. van Ritbergen, J.A.M. Vermaseren | The 3-loop QCD calculation of the moments of deep inelastic structure
functions | 46 pages, the complete Postscript file of this preprint (including 9
figures) is available at ftp://nikhefh.nikhef.nl/pub/preprints/96-010.ps.Z | Nucl.Phys.B492:338-378,1997 | 10.1016/S0550-3213(97)80038-7 | NIKHEF-96-010 | hep-ph | null | We present the analytic next-to-next-to-leading perturbative QCD corrections
in the leading twist approximation for the moments N=2,4,6,8 of the flavour
singlet deep inelastic structure functions F_2 and F_L. We calculate the
three-loop anomalous dimensions of the corresponding singlet operators and the
three-loop coefficient functions of the structure functions F_L and F_2. In
addition, we obtained the 10th moment for the non-singlet structure functions
in the same order of perturbative QCD. We perform an analysis of the obtained
results.
| [
{
"created": "Wed, 15 May 1996 13:07:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Larin",
"S. A.",
""
],
[
"Nogueira",
"P.",
""
],
[
"van Ritbergen",
"T.",
""
],
[
"Vermaseren",
"J. A. M.",
""
]
] | We present the analytic next-to-next-to-leading perturbative QCD corrections in the leading twist approximation for the moments N=2,4,6,8 of the flavour singlet deep inelastic structure functions F_2 and F_L. We calculate the three-loop anomalous dimensions of the corresponding singlet operators and the three-loop coefficient functions of the structure functions F_L and F_2. In addition, we obtained the 10th moment for the non-singlet structure functions in the same order of perturbative QCD. We perform an analysis of the obtained results. |
2104.01972 | Henry Day-Hall | G. Cerro (1), S. Dasmahapatra (1), H.A. Day-Hall (1, 2 and 3), B. Ford
(1), S. Moretti (1), C.H. Shepherd-Themistocleous (2) ((1) University of
Southampton, UK, (2) Rutherford Appleton laboratory, UK, (3) Czech Technical
University, Prague) | Spectral Clustering for Jet Physics | 31 pages, 17 figures | null | 10.1007/JHEP02(2022)165 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new approach to jet definition alternative to clustering
methods, such as the anti-$k_T$ scheme, that exploit kinematic data directly.
Instead the new method uses kinematic information to represent the particles in
a multidimensional space, as in spectral clustering. After confirming its
Infra-Red (IR) safety, we compare its performance in analysing $qq\to
H_{125\,\text{GeV}} \rightarrow H_{40\,\text{GeV}} H_{40\,\text{GeV}}
\rightarrow b \bar{b} b \bar{b}$, $qq\to H_{500\,\text{GeV}} \rightarrow
H_{125\,\text{GeV}} H_{125\,\text{GeV}} \rightarrow b \bar{b} b \bar{b}$ and
$gg,q\bar q\to t\bar t\to b\bar b W^+W^-\to b\bar b jj \ell\nu_\ell$ events
from Monte Carlo (MC) samples, specifically, in reconstructing the relevant
final states, to that of the anti-kT algorithm. Finally, we show that the
results for spectral clustering are obtained without any change in the
parameter settings of the algorithm, unlike the anti-kT case, which requires
the cone size to be adjusted to the physics process under study.
| [
{
"created": "Mon, 5 Apr 2021 15:48:15 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2021 17:50:46 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Dec 2021 07:04:41 GMT",
"version": "v3"
},
{
"created": "Fri, 28 Jan 2022 14:45:00 GMT",
"version": "v4"
}
] | 2022-03-09 | [
[
"Cerro",
"G.",
"",
"1, 2 and 3"
],
[
"Dasmahapatra",
"S.",
"",
"1, 2 and 3"
],
[
"Day-Hall",
"H. A.",
"",
"1, 2 and 3"
],
[
"Ford",
"B.",
""
],
[
"Moretti",
"S.",
""
],
[
"Shepherd-Themistocleous",
"C. H.",
""
... | We present a new approach to jet definition alternative to clustering methods, such as the anti-$k_T$ scheme, that exploit kinematic data directly. Instead the new method uses kinematic information to represent the particles in a multidimensional space, as in spectral clustering. After confirming its Infra-Red (IR) safety, we compare its performance in analysing $qq\to H_{125\,\text{GeV}} \rightarrow H_{40\,\text{GeV}} H_{40\,\text{GeV}} \rightarrow b \bar{b} b \bar{b}$, $qq\to H_{500\,\text{GeV}} \rightarrow H_{125\,\text{GeV}} H_{125\,\text{GeV}} \rightarrow b \bar{b} b \bar{b}$ and $gg,q\bar q\to t\bar t\to b\bar b W^+W^-\to b\bar b jj \ell\nu_\ell$ events from Monte Carlo (MC) samples, specifically, in reconstructing the relevant final states, to that of the anti-kT algorithm. Finally, we show that the results for spectral clustering are obtained without any change in the parameter settings of the algorithm, unlike the anti-kT case, which requires the cone size to be adjusted to the physics process under study. |
hep-ph/0003028 | Jonathan Robert Sapirstein | G.S. Adkins, R.N. Fell, and J. Sapirstein | Order \alpha^2 corrections to the decay rate of orthopositronium | 7 pages, 1 figure | Phys.Rev.Lett. 84 (2000) 5086-5089 | 10.1103/PhysRevLett.84.5086 | null | hep-ph | null | Order \alpha^2 corrections to the decay rate of orthopositronium are
calculated in the framework of nonrelativistic QED. The resulting contribution
is found to be in significant disagreement with one set of experimental
measurements though another experiment is in agreement with theory.
| [
{
"created": "Fri, 3 Mar 2000 18:36:05 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Mar 2000 15:26:07 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Adkins",
"G. S.",
""
],
[
"Fell",
"R. N.",
""
],
[
"Sapirstein",
"J.",
""
]
] | Order \alpha^2 corrections to the decay rate of orthopositronium are calculated in the framework of nonrelativistic QED. The resulting contribution is found to be in significant disagreement with one set of experimental measurements though another experiment is in agreement with theory. |
0712.2455 | Kaustubh Agashe | Kaustubh Agashe, Adam Falkowski, Ian Low and Geraldine Servant | KK Parity in Warped Extra Dimension | 35 pages, 11 figures | JHEP 0804:027,2008 | 10.1088/1126-6708/2008/04/027 | ANL-HEP-PR-07-104, CERN-PH-TH/2007-247, SPhT-T07/153, SU-4252-863,
UMD-PP-07-008 | hep-ph | null | We construct models with a Kaluza-Klein (KK) parity in a five- dimensional
warped geometry, in an attempt to address the little hierarchy problem present
in setups with bulk Standard Model fields. The lightest KK particle (LKP) is
stable and can play the role of dark matter. We consider the possibilities of
gluing two identical slices of 5D AdS in either the UV (IR-UV-IR model) or the
IR region (UV-IR-UV model) and discuss the model-building issues as well as
phenomenological properties in both cases. In particular, we find that the
UV-IR-UV model is not gravitationally stable and that additional mechanisms
might be required in the IR-UV-IR model in order to address flavor issues.
Collider signals of the warped KK parity are different from either the
conventional warped extra dimension without KK parity, in which the new
particles are not necessarily pair-produced, or the KK parity in flat universal
extra dimensions, where each KK level is nearly degenerate in mass. Dark matter
and collider properties of a TeV mass KK Z gauge boson as the LKP are
discussed.
| [
{
"created": "Mon, 17 Dec 2007 16:36:40 GMT",
"version": "v1"
}
] | 2009-12-15 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Falkowski",
"Adam",
""
],
[
"Low",
"Ian",
""
],
[
"Servant",
"Geraldine",
""
]
] | We construct models with a Kaluza-Klein (KK) parity in a five- dimensional warped geometry, in an attempt to address the little hierarchy problem present in setups with bulk Standard Model fields. The lightest KK particle (LKP) is stable and can play the role of dark matter. We consider the possibilities of gluing two identical slices of 5D AdS in either the UV (IR-UV-IR model) or the IR region (UV-IR-UV model) and discuss the model-building issues as well as phenomenological properties in both cases. In particular, we find that the UV-IR-UV model is not gravitationally stable and that additional mechanisms might be required in the IR-UV-IR model in order to address flavor issues. Collider signals of the warped KK parity are different from either the conventional warped extra dimension without KK parity, in which the new particles are not necessarily pair-produced, or the KK parity in flat universal extra dimensions, where each KK level is nearly degenerate in mass. Dark matter and collider properties of a TeV mass KK Z gauge boson as the LKP are discussed. |
1912.05806 | Defu Hou | Zhou-Run Zhu, De-fu Hou (CCNU), Xun Chen | Potential analysis of holographic Schwinger effect in the magnetized
background | 21 pages with 9 figures in Revtex; one new section and 4 figures
added | Eur. Phys. J. C (2020) 80:550 | 10.1140/epjc/s10052-020-8110-8 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the holographic Schwinger effect with magnetic field at RHIC and LHC
energies by using the AdS/CFT correspondence. We consider both weak and strong
magnetic field cases with $B\ll T^2$ and $B\gg T^2$ solutions respectively.
Firstly, we calculate separating length of the particle pairs at finite
magnetic field. It is found that for both weak and strong magnetic field
solutions the maximum value of separating length decreases with the increase of
magnetic field , which can be inferred that the virtual electron-positron pairs
become real particles more easily. We also find that the magnetic field reduces
the potential barrier and the critical field for the weak magnetic field
solution, thus favors the Schwinger effect. With strong magnetic field
solution, the magnetic field enhances the Schwinger effect when the pairs are
in perpendicular to the magnetic field although the magnetic field increases
the critical electric field.
| [
{
"created": "Thu, 12 Dec 2019 07:30:23 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jul 2020 10:26:01 GMT",
"version": "v2"
}
] | 2020-07-07 | [
[
"Zhu",
"Zhou-Run",
"",
"CCNU"
],
[
"Hou",
"De-fu",
"",
"CCNU"
],
[
"Chen",
"Xun",
""
]
] | We study the holographic Schwinger effect with magnetic field at RHIC and LHC energies by using the AdS/CFT correspondence. We consider both weak and strong magnetic field cases with $B\ll T^2$ and $B\gg T^2$ solutions respectively. Firstly, we calculate separating length of the particle pairs at finite magnetic field. It is found that for both weak and strong magnetic field solutions the maximum value of separating length decreases with the increase of magnetic field , which can be inferred that the virtual electron-positron pairs become real particles more easily. We also find that the magnetic field reduces the potential barrier and the critical field for the weak magnetic field solution, thus favors the Schwinger effect. With strong magnetic field solution, the magnetic field enhances the Schwinger effect when the pairs are in perpendicular to the magnetic field although the magnetic field increases the critical electric field. |
2011.02487 | Yue Zhang | Kevin J. Kelly, Manibrata Sen, Yue Zhang | Intimate Relationship Between Sterile Neutrino Dark Matter and $\Delta
N_{\rm eff}$ | 5+5 pages, 7 figures, matches published version | Phys. Rev. Lett. 127, 041101 (2021) | 10.1103/PhysRevLett.127.041101 | FERMILAB-PUB-20-576-T, N3AS-20-005, NUHEP-TH/20-12 | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://creativecommons.org/licenses/by/4.0/ | The self-interacting neutrino hypothesis is well motivated for addressing the
tension between the origin of sterile neutrino dark matter and indirect
detection constraints. It can also result in a number of testable signals from
the laboratories to the cosmos. We explore a model of neutrino self-interaction
mediated by a Majoron-like scalar with sub-MeV mass, and show that explaining
the relic density of sterile neutrino dark matter implies a lower bound on the
amount of extra radiation in early universe, in particular $\Delta N_{\rm
eff}>0.12$ at the CMB epoch. This lower bound will be further strengthened with
an improved $X$-ray search at the Athena observatory. Such an intimate
relationship will be unambiguously tested by the upcoming CMB-S4 project.
| [
{
"created": "Wed, 4 Nov 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2021 01:26:08 GMT",
"version": "v2"
},
{
"created": "Tue, 31 May 2022 17:21:10 GMT",
"version": "v3"
}
] | 2022-06-01 | [
[
"Kelly",
"Kevin J.",
""
],
[
"Sen",
"Manibrata",
""
],
[
"Zhang",
"Yue",
""
]
] | The self-interacting neutrino hypothesis is well motivated for addressing the tension between the origin of sterile neutrino dark matter and indirect detection constraints. It can also result in a number of testable signals from the laboratories to the cosmos. We explore a model of neutrino self-interaction mediated by a Majoron-like scalar with sub-MeV mass, and show that explaining the relic density of sterile neutrino dark matter implies a lower bound on the amount of extra radiation in early universe, in particular $\Delta N_{\rm eff}>0.12$ at the CMB epoch. This lower bound will be further strengthened with an improved $X$-ray search at the Athena observatory. Such an intimate relationship will be unambiguously tested by the upcoming CMB-S4 project. |
2005.10421 | Motoo Suzuki | Takashi Hiramatsu, Masahiro Ibe, Motoo Suzuki | Cosmic String in Abelian-Higgs Model with Enhanced Symmetry --
Implication to the Axion Domain-Wall Problem -- | 27 pages, 16 figures, version to be published in JHEP | null | null | IPMU20-0059, RUP-20-16 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our previous work, we found new types of the cosmic string solutions in
the Abelian-Higgs model with an enhanced $U(1)$ global symmetry. We dubbed
those solutions as the compensated/uncompensated strings. The compensated
string is similar to the conventional cosmic string in the
Abrikosov-Nielsen-Olesen (ANO) string, around which only the would-be
Nambu-Goldstone (NG) boson winds. Around the uncompensated string, on the other
hand, the physical NG boson also winds, where the physical NG boson is
associated with the spontaneous breaking of the enhanced symmetry. Our previous
simulation in the 2+1 dimensional spacetime confirmed that both the
compensated/uncompensated strings are formed at the phase transition of the
symmetry breaking. Non-trivial winding of the physical NG boson around the
strings potentially causes the so-called axion domain-wall problem when the
model is applied to the axion model. In this paper, we perform simulation in
the 3+1 dimensional spacetime to discuss the fate of the uncompensated strings.
We observe that the evolution of the string-network is highly complicated in
the 3+1 dimensional simulation compared with that seen in the previous
simulation. Despite such complications, we find that the number of the
uncompensated strings which could cause can be highly suppressed at late times.
Our observation suggests that the present setup can be applied to the axion
model without suffering from the axion domain-wall problem.
| [
{
"created": "Thu, 21 May 2020 01:57:44 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Sep 2020 05:00:52 GMT",
"version": "v2"
}
] | 2020-09-08 | [
[
"Hiramatsu",
"Takashi",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Suzuki",
"Motoo",
""
]
] | In our previous work, we found new types of the cosmic string solutions in the Abelian-Higgs model with an enhanced $U(1)$ global symmetry. We dubbed those solutions as the compensated/uncompensated strings. The compensated string is similar to the conventional cosmic string in the Abrikosov-Nielsen-Olesen (ANO) string, around which only the would-be Nambu-Goldstone (NG) boson winds. Around the uncompensated string, on the other hand, the physical NG boson also winds, where the physical NG boson is associated with the spontaneous breaking of the enhanced symmetry. Our previous simulation in the 2+1 dimensional spacetime confirmed that both the compensated/uncompensated strings are formed at the phase transition of the symmetry breaking. Non-trivial winding of the physical NG boson around the strings potentially causes the so-called axion domain-wall problem when the model is applied to the axion model. In this paper, we perform simulation in the 3+1 dimensional spacetime to discuss the fate of the uncompensated strings. We observe that the evolution of the string-network is highly complicated in the 3+1 dimensional simulation compared with that seen in the previous simulation. Despite such complications, we find that the number of the uncompensated strings which could cause can be highly suppressed at late times. Our observation suggests that the present setup can be applied to the axion model without suffering from the axion domain-wall problem. |
1905.03295 | Silas Beane | Silas R. Beane and Peter Ehlers | Chiral symmetry breaking, entanglement, and the nucleon spin
decomposition | 6 pages, 3 figures | null | 10.1142/S0217732320500480 | NT@UW-19-06 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nucleon is naturally viewed as a bipartite system of valence spin --
defined by its non-vanishing chiral charge -- and non-valence or sea spin. The
sea spin can be traced over to give a reduced density matrix, and it is shown
that the resulting entanglement entropy acts as an order parameter of chiral
symmetry breaking in the nucleon. In the large-$N_c$ limit, the entanglement
entropy vanishes and the valence spin accounts for all of the nucleon spin,
while in the limit of maximal entanglement entropy, the nucleon loses memory of
the valence spin and consequently has spin dominated by the sea. The nucleon
state vector in the chiral basis, fit to low-energy data, gives a valence spin
content consistent with experiment and lattice QCD determinations, and has
large entanglement entropy.
| [
{
"created": "Wed, 8 May 2019 18:55:24 GMT",
"version": "v1"
}
] | 2020-04-22 | [
[
"Beane",
"Silas R.",
""
],
[
"Ehlers",
"Peter",
""
]
] | The nucleon is naturally viewed as a bipartite system of valence spin -- defined by its non-vanishing chiral charge -- and non-valence or sea spin. The sea spin can be traced over to give a reduced density matrix, and it is shown that the resulting entanglement entropy acts as an order parameter of chiral symmetry breaking in the nucleon. In the large-$N_c$ limit, the entanglement entropy vanishes and the valence spin accounts for all of the nucleon spin, while in the limit of maximal entanglement entropy, the nucleon loses memory of the valence spin and consequently has spin dominated by the sea. The nucleon state vector in the chiral basis, fit to low-energy data, gives a valence spin content consistent with experiment and lattice QCD determinations, and has large entanglement entropy. |
2212.07233 | Girish Kumar | Girish Kumar | Interplay of the charged Higgs effects in $R_{D^{(\ast)}}$, $b\to s
\ell^+\ell^-$ and $W$-mass | 11 pages, 2 captioned figures, extended discussion in sec III.A and
IV, and added an appendix; matches published version | Phys. Rev. D 107, 075016 (2023) | 10.1103/PhysRevD.107.075016 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Current data on semileptonic charged- and neutral-current $B$ decays show
deviations from the predictions of the Standard Model. It is well known that a
charged Higgs boson, belonging to the two-Higgs doublet model without $Z_2$
symmetry, offers one of the simplest solution to the charged-current $B$
decays. We show that this solution naturally induces a negative shift of
$\mathcal{O}(1)$ in the Wilson coefficient ($C_{9\ell}$) of operator $(\bar
s_L\gamma_\mu b_L)(\bar \ell\gamma^\mu \ell)$, potentially resolving the
tension in neutral-current $B$ decays as well. Interestingly, the lepton
universality ratios in $b\to s \ell^+\ell^-$ decays, in tune with the recent
LHCb result, remain SM-like. Precision constraints from neutral $B$ and $K$
meson mixing, decays $B_c\to \tau\bar\nu$, $B\to X_s\gamma$, and leptonic
decays of $\tau$ and $Z$ can be satisfied. Furthermore, a positive shift in
$W$-boson mass, nicely in agreement with the CDF measurement, is also possible,
requiring the neutral scalars to be heavier than the charged Higgs but within
the sub-TeV region.
| [
{
"created": "Wed, 14 Dec 2022 14:12:02 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 18:46:53 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Dec 2022 10:15:58 GMT",
"version": "v3"
},
{
"created": "Thu, 20 Apr 2023 09:41:54 GMT",
"version": "v4"
}
] | 2023-04-21 | [
[
"Kumar",
"Girish",
""
]
] | Current data on semileptonic charged- and neutral-current $B$ decays show deviations from the predictions of the Standard Model. It is well known that a charged Higgs boson, belonging to the two-Higgs doublet model without $Z_2$ symmetry, offers one of the simplest solution to the charged-current $B$ decays. We show that this solution naturally induces a negative shift of $\mathcal{O}(1)$ in the Wilson coefficient ($C_{9\ell}$) of operator $(\bar s_L\gamma_\mu b_L)(\bar \ell\gamma^\mu \ell)$, potentially resolving the tension in neutral-current $B$ decays as well. Interestingly, the lepton universality ratios in $b\to s \ell^+\ell^-$ decays, in tune with the recent LHCb result, remain SM-like. Precision constraints from neutral $B$ and $K$ meson mixing, decays $B_c\to \tau\bar\nu$, $B\to X_s\gamma$, and leptonic decays of $\tau$ and $Z$ can be satisfied. Furthermore, a positive shift in $W$-boson mass, nicely in agreement with the CDF measurement, is also possible, requiring the neutral scalars to be heavier than the charged Higgs but within the sub-TeV region. |
2104.04543 | Marco Bellagente | Marco Bellagente, Manuel Hau{\ss}mann, Michel Luchmann, and Tilman
Plehn | Understanding Event-Generation Networks via Uncertainties | 24 pages | SciPost Phys. 13, 003 (2022) | 10.21468/SciPostPhys.13.1.003 | null | hep-ph cs.LG | http://creativecommons.org/licenses/by/4.0/ | Following the growing success of generative neural networks in LHC
simulations, the crucial question is how to control the networks and assign
uncertainties to their event output. We show how Bayesian normalizing flow or
invertible networks capture uncertainties from the training and turn them into
an uncertainty on the event weight. Fundamentally, the interplay between
density and uncertainty estimates indicates that these networks learn functions
in analogy to parameter fits rather than binned event counts.
| [
{
"created": "Fri, 9 Apr 2021 18:01:36 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Oct 2021 09:09:19 GMT",
"version": "v2"
}
] | 2022-12-07 | [
[
"Bellagente",
"Marco",
""
],
[
"Haußmann",
"Manuel",
""
],
[
"Luchmann",
"Michel",
""
],
[
"Plehn",
"Tilman",
""
]
] | Following the growing success of generative neural networks in LHC simulations, the crucial question is how to control the networks and assign uncertainties to their event output. We show how Bayesian normalizing flow or invertible networks capture uncertainties from the training and turn them into an uncertainty on the event weight. Fundamentally, the interplay between density and uncertainty estimates indicates that these networks learn functions in analogy to parameter fits rather than binned event counts. |
1601.00300 | Piet Mulders | P.J. Mulders | The Roots of the Standard Model of Particle Physics | 6 pages, 2 figures; latest version includes some minor corrections;
paper included in contribution (The 3D structure of QCD and the roots of the
standard model) to 6th International Conference on Physics Opportunities at
Electron-Ion Collider (POETIC 6), Sep 2015, Ecole Polytechnique, Palaiseau,
France | null | null | Nikhef 2016-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conjecture how the particle content of the standard model can emerge
starting with a supersymmetric Wess-Zumino model in 1+1 dimensions (d = 2) with
three real boson and fermion fields. Considering SU(3) transformations, the
lagrangian and its ground state are SO(3) invariant. The SO(3) symmetry extends
the basic IO(1,1) Poincar\'e symmetry to IO(1,3) for the asymptotic fields
requiring physical states to be singlets under the A_4 symmetry that governs
the SO(3) embedding. This is linked to the three-family structure. For the
internal symmetries of the asymptotic fields an SU(2) x U(1) symmetry remains,
broken down as in the standard model. The boson excitations in d = 4 are
identified with electroweak gauge bosons and the Higgs boson. Fermion
excitations come in three families of leptons living in E(1,3) Minkowski space
or three families of quarks living in E(1,1). Many features of the standard
model now emerge in a natural way. The supersymmetric starting point solves the
naturalness problem. The underlying left-right symmetry leads to custodial
symmetry in the electroweak sector. In the spectrum one has Dirac-type charged
leptons and Majorana-type neutrinos. The electroweak behavior of the naturally
confined quarks, leads to fractional electric charges and the doublet and
singlet structure of left- and right-handed quarks, respectively. Most
prominent feature is the link between the number of colors, families and space
directions.
| [
{
"created": "Sun, 3 Jan 2016 14:26:27 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2016 12:17:48 GMT",
"version": "v2"
}
] | 2016-01-12 | [
[
"Mulders",
"P. J.",
""
]
] | We conjecture how the particle content of the standard model can emerge starting with a supersymmetric Wess-Zumino model in 1+1 dimensions (d = 2) with three real boson and fermion fields. Considering SU(3) transformations, the lagrangian and its ground state are SO(3) invariant. The SO(3) symmetry extends the basic IO(1,1) Poincar\'e symmetry to IO(1,3) for the asymptotic fields requiring physical states to be singlets under the A_4 symmetry that governs the SO(3) embedding. This is linked to the three-family structure. For the internal symmetries of the asymptotic fields an SU(2) x U(1) symmetry remains, broken down as in the standard model. The boson excitations in d = 4 are identified with electroweak gauge bosons and the Higgs boson. Fermion excitations come in three families of leptons living in E(1,3) Minkowski space or three families of quarks living in E(1,1). Many features of the standard model now emerge in a natural way. The supersymmetric starting point solves the naturalness problem. The underlying left-right symmetry leads to custodial symmetry in the electroweak sector. In the spectrum one has Dirac-type charged leptons and Majorana-type neutrinos. The electroweak behavior of the naturally confined quarks, leads to fractional electric charges and the doublet and singlet structure of left- and right-handed quarks, respectively. Most prominent feature is the link between the number of colors, families and space directions. |
1003.0576 | Bilal Masud | M. Imran Jamil, Bilal Masud | Dynamical effects of QCD in $q^2 \bar{q}^{2}$ systems | 18 pages, 9 figures | Eur. Phys. J. A (2011) 47: 33 | 10.1140/epja/i2011-11033-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the coupling of a tetraquark system to an exchanged meson-meson
channel, using a pure gluonic theory based four-quark potential {\em matrix}
model which is known to fit well a large number of data points for lattice
simulations of different geometries of a four-quark system. We find that if
this minimal-area-based potential matrix replaces the earlier used simple
Gaussian form for the gluon field overlap factor $f$ in its off-diagonal terms,
the resulting $T$-matrix and phase shifts develop an angle dependence whose
partial wave analysis reveals $D$ wave and higher angular momentum components
in it. In addition to the obvious implications of this result for the
meson-meson scattering, this new feature indicates the possibility of orbital
excitations influencing properties of meson-meson molecules through a
polarization potential. We have used a formalism of the resonating group
method, treated kinetic energy and overlap matrices on model of the potential
matrix, but decoupled the resulting complicated integral equations through the
Born approximation. In this exploratory study we have used a quadratic
confinement and not included the spin-dependence; we also used the
approximation of equal constituent quark masses.
| [
{
"created": "Tue, 2 Mar 2010 12:55:13 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2010 08:11:43 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Jul 2010 10:41:56 GMT",
"version": "v3"
},
{
"created": "Thu, 23 Dec 2010 07:03:02 GMT",
"version": "v4"
},
{
"crea... | 2011-03-09 | [
[
"Jamil",
"M. Imran",
""
],
[
"Masud",
"Bilal",
""
]
] | We study the coupling of a tetraquark system to an exchanged meson-meson channel, using a pure gluonic theory based four-quark potential {\em matrix} model which is known to fit well a large number of data points for lattice simulations of different geometries of a four-quark system. We find that if this minimal-area-based potential matrix replaces the earlier used simple Gaussian form for the gluon field overlap factor $f$ in its off-diagonal terms, the resulting $T$-matrix and phase shifts develop an angle dependence whose partial wave analysis reveals $D$ wave and higher angular momentum components in it. In addition to the obvious implications of this result for the meson-meson scattering, this new feature indicates the possibility of orbital excitations influencing properties of meson-meson molecules through a polarization potential. We have used a formalism of the resonating group method, treated kinetic energy and overlap matrices on model of the potential matrix, but decoupled the resulting complicated integral equations through the Born approximation. In this exploratory study we have used a quadratic confinement and not included the spin-dependence; we also used the approximation of equal constituent quark masses. |
1809.01158 | Ben Allanach PhD | B.C. Allanach, Joe Davighi | Third Family Hypercharge Model for $R_{K^{(\ast)}}$ and Aspects of the
Fermion Mass Problem | 22 pages. BRs in Table 2 corrected (error introduced in v5). v4
accepted for publication by JHEP | null | 10.1007/JHEP12(2018)075 | DAMTP-2018-30 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model to explain LHCb's recent measurements of $R_K$ and
$R_{K^{\ast}}$ based on an anomaly-free, spontaneously-broken $U(1)_F$ gauge
symmetry, without any fermionic fields beyond those of the Standard Model (SM).
The model explains the hierarchical heaviness of the third family and the
smallness of quark mixing. The $U(1)_F$ charges of the third family of SM
fields and the Higgs doublet are set equal to their respective hypercharges. A
heavy $Z^\prime$ particle with flavour-dependent couplings can modify the
$[\overline{b_L} \gamma^\rho s_L][\overline{\mu_L} \gamma_\rho \mu_L]$
effective vertex in the desired way. The $Z^\prime$ contribution to
$B_s-\overline{B_s}$ mixing is suppressed by a small mixing angle connected to
$V_{ts}$, making the constraint coming from its measurement easier to satisfy.
The model can explain $R_K$ and $R_{K^{(\ast)}}$ whilst simultaneously passing
other constraints, including measurements of the lepton flavour universality of
$Z$ couplings.
| [
{
"created": "Tue, 4 Sep 2018 18:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2018 19:33:56 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Sep 2018 16:56:08 GMT",
"version": "v3"
},
{
"created": "Fri, 21 Dec 2018 12:23:33 GMT",
"version": "v4"
},
{
"cr... | 2021-08-24 | [
[
"Allanach",
"B. C.",
""
],
[
"Davighi",
"Joe",
""
]
] | We present a model to explain LHCb's recent measurements of $R_K$ and $R_{K^{\ast}}$ based on an anomaly-free, spontaneously-broken $U(1)_F$ gauge symmetry, without any fermionic fields beyond those of the Standard Model (SM). The model explains the hierarchical heaviness of the third family and the smallness of quark mixing. The $U(1)_F$ charges of the third family of SM fields and the Higgs doublet are set equal to their respective hypercharges. A heavy $Z^\prime$ particle with flavour-dependent couplings can modify the $[\overline{b_L} \gamma^\rho s_L][\overline{\mu_L} \gamma_\rho \mu_L]$ effective vertex in the desired way. The $Z^\prime$ contribution to $B_s-\overline{B_s}$ mixing is suppressed by a small mixing angle connected to $V_{ts}$, making the constraint coming from its measurement easier to satisfy. The model can explain $R_K$ and $R_{K^{(\ast)}}$ whilst simultaneously passing other constraints, including measurements of the lepton flavour universality of $Z$ couplings. |
0709.4174 | Christoph Bobeth | Christoph Bobeth, Gudrun Hiller, Giorgi Piranishvili | Angular Distributions of B -> K ll Decays | 1 + 28 pages, 8 figures, uses JHEP3.cls; affiliation renamed, typos
corrected, comments on electroweak corrections + 1 reference added | JHEP0712:040,2007 | 10.1088/1126-6708/2007/12/040 | DO-TH 07/07 | hep-ph | null | We model-independently analyze the angular distributions of B -> K ll decays,
l = e, mu, for low dilepton mass using QCD factorization. Besides the decay
rate, we study the forward-backward asymmetry A_FB^l and a further observable,
F_H^l, which gives rise to a flat term in the angular distribution. We find
that in the Standard Model F_H^l ~ m_l^2, hence vanishing F_H^e and F_H^mu of
around 2% (exact value depends on cuts) with a very small theoretical
uncertainty of a few percent. We also give predictions for R_K, the ratio of B
-> K mu mu to B -> K ee decay rates. We analytically show using large recoil
symmetry relations that in the Standard Model R_K equals one up to lepton mass
corrections of the order 10^(-4). The New Physics reach of the observables from
the B -> K ll angular analysis is explored together with R_K and the B_s -> ll
and B -> X_s ll branching ratios for both l = e and l = mu. We find substantial
room for signals from (pseudo-) scalar and tensor interactions beyond the
Standard Model. Experimental investigations of the B -> K mu mu angular
distributions are suitable for the LHC environment and high luminosity B
factories, where also studies of the electron modes are promising.
| [
{
"created": "Wed, 26 Sep 2007 15:13:24 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2007 14:12:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bobeth",
"Christoph",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"Piranishvili",
"Giorgi",
""
]
] | We model-independently analyze the angular distributions of B -> K ll decays, l = e, mu, for low dilepton mass using QCD factorization. Besides the decay rate, we study the forward-backward asymmetry A_FB^l and a further observable, F_H^l, which gives rise to a flat term in the angular distribution. We find that in the Standard Model F_H^l ~ m_l^2, hence vanishing F_H^e and F_H^mu of around 2% (exact value depends on cuts) with a very small theoretical uncertainty of a few percent. We also give predictions for R_K, the ratio of B -> K mu mu to B -> K ee decay rates. We analytically show using large recoil symmetry relations that in the Standard Model R_K equals one up to lepton mass corrections of the order 10^(-4). The New Physics reach of the observables from the B -> K ll angular analysis is explored together with R_K and the B_s -> ll and B -> X_s ll branching ratios for both l = e and l = mu. We find substantial room for signals from (pseudo-) scalar and tensor interactions beyond the Standard Model. Experimental investigations of the B -> K mu mu angular distributions are suitable for the LHC environment and high luminosity B factories, where also studies of the electron modes are promising. |
1203.3118 | Shu Luo | Shu Luo, Zhi-zhong Xing | Impacts of the observed theta_{13} on the running behaviors of Dirac and
Majorana neutrino mixing angles and CP-violating phases | RevTeX 16 pages, 3 figures, 4 tables, more discussions added,
references updated. Accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.86.073003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observation of the smallest neutrino mixing angle $\theta_{13}$ in
the Daya Bay and RENO experiments motivates us to examine whether $\theta_{13}
\simeq 9^\circ$ at the electroweak scale can be generated from $\theta_{13} =
0^\circ$ at a superhigh-energy scale via the radiative corrections. We find
that it is difficult but not impossible in the minimal supersymmetric standard
model (MSSM), and a relatively large $\theta_{13}$ may have some nontrivial
impacts on the running behaviors of the other two mixing angles and
CP-violating phases. In particular, we demonstrate that the CP-violating phases
play a crucial role in the evolution of the mixing angles by using the one-loop
renormalization-group equations of the Dirac or Majorana neutrinos in the MSSM.
We also take the "correlative" neutrino mixing pattern with $\theta_{12} \simeq
35.3^\circ$, $\theta_{23} = 45^\circ$ and $\theta_{13} \simeq 9.7^\circ$ at a
presumable flavor symmetry scale as an example to illustrate that the three
mixing angles can receive comparably small radiative corrections and thus
evolve to their best-fit values at the electroweak scale if the CP-violating
phases are properly adjusted.
| [
{
"created": "Wed, 14 Mar 2012 15:48:49 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2012 15:15:12 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Sep 2012 07:42:00 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Luo",
"Shu",
""
],
[
"Xing",
"Zhi-zhong",
""
]
] | The recent observation of the smallest neutrino mixing angle $\theta_{13}$ in the Daya Bay and RENO experiments motivates us to examine whether $\theta_{13} \simeq 9^\circ$ at the electroweak scale can be generated from $\theta_{13} = 0^\circ$ at a superhigh-energy scale via the radiative corrections. We find that it is difficult but not impossible in the minimal supersymmetric standard model (MSSM), and a relatively large $\theta_{13}$ may have some nontrivial impacts on the running behaviors of the other two mixing angles and CP-violating phases. In particular, we demonstrate that the CP-violating phases play a crucial role in the evolution of the mixing angles by using the one-loop renormalization-group equations of the Dirac or Majorana neutrinos in the MSSM. We also take the "correlative" neutrino mixing pattern with $\theta_{12} \simeq 35.3^\circ$, $\theta_{23} = 45^\circ$ and $\theta_{13} \simeq 9.7^\circ$ at a presumable flavor symmetry scale as an example to illustrate that the three mixing angles can receive comparably small radiative corrections and thus evolve to their best-fit values at the electroweak scale if the CP-violating phases are properly adjusted. |
1001.3147 | Patrick J. Fox | Bogdan A. Dobrescu and Patrick J. Fox | Uplifted supersymmetric Higgs region | 14 pages; Signs in Eqns. (3.1) and (4.2) corrected, appendix included | Eur.Phys.J.C70:263-270,2010 | 10.1140/epjc/s10052-010-1399-y | FERMILAB-PUB-10-009-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the parameter space of the Minimal Supersymmetric Standard Model
includes a region where the down-type fermion masses are generated by the
loop-induced couplings to the up-type Higgs doublet. In this region the
down-type Higgs doublet does not acquire a vacuum expectation value at tree
level, and has sizable couplings in the superpotential to the tau leptons and
bottom quarks. Besides a light standard-like Higgs boson, the Higgs spectrum
includes the nearly degenerate states of a heavy spin-0 doublet which can be
produced through their couplings to the $b$ quark and decay predominantly into
\tau^+\tau^- or \tau\nu.
| [
{
"created": "Tue, 19 Jan 2010 18:47:29 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2010 21:14:24 GMT",
"version": "v2"
}
] | 2011-02-09 | [
[
"Dobrescu",
"Bogdan A.",
""
],
[
"Fox",
"Patrick J.",
""
]
] | We show that the parameter space of the Minimal Supersymmetric Standard Model includes a region where the down-type fermion masses are generated by the loop-induced couplings to the up-type Higgs doublet. In this region the down-type Higgs doublet does not acquire a vacuum expectation value at tree level, and has sizable couplings in the superpotential to the tau leptons and bottom quarks. Besides a light standard-like Higgs boson, the Higgs spectrum includes the nearly degenerate states of a heavy spin-0 doublet which can be produced through their couplings to the $b$ quark and decay predominantly into \tau^+\tau^- or \tau\nu. |
1403.4531 | Eugene Levin | E. Gotsman (Tel Aviv U.), E. Levin (Tel Aviv U. and UTFSM) and U. Maor
(Tel Aviv U.) | A comprehensive model of soft interactions in the LHC era | 48 pp. 32 figures in .eps files, Contribution to appear in the
special issue of International Journal opf Modern Physics A on on "Elastic
and Diffractive Scattering" coordinated by Cristophe Royon. IJMPA .2014 | null | 10.1142/S0217751X15420051 | TAUP 2981/14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review we present our model which is an example of the self
consistent approach that incorporates our theoretical understanding of long
distance physics, based both on N=4 SYM for strong coupling and on the matching
with the perturbative QCD approach. We demonstrate how important and decisive
the LHC data were on strong interactions which led us to a set of the
phenomenological parameters that fully confirmed our theoretical expectations,
and produced a new picture of the strong interaction at high energy. We also
show how far we have come towards creating a framework for the description of
minimal bias events for high energy scattering without generating Monte Carlo
codes.
| [
{
"created": "Tue, 18 Mar 2014 16:47:10 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv U."
],
[
"Levin",
"E.",
"",
"Tel Aviv U. and UTFSM"
],
[
"Maor",
"U.",
"",
"Tel Aviv U."
]
] | In this review we present our model which is an example of the self consistent approach that incorporates our theoretical understanding of long distance physics, based both on N=4 SYM for strong coupling and on the matching with the perturbative QCD approach. We demonstrate how important and decisive the LHC data were on strong interactions which led us to a set of the phenomenological parameters that fully confirmed our theoretical expectations, and produced a new picture of the strong interaction at high energy. We also show how far we have come towards creating a framework for the description of minimal bias events for high energy scattering without generating Monte Carlo codes. |
2012.10105 | Pablo G. Ortega | Pablo G. Ortega and David R. Entem | Coupling hadron-hadron thresholds within a chiral quark model approach | 24 pages, 8 figures, 5 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy hadron spectroscopy was well understood within the naive quark model
until the end of the past century. However, in 2003, the $X(3872)$ was
discovered, with puzzling properties difficult to understand in the simple
naive quark model picture. This state made clear that excited states of heavy
mesons should be coupled to two-meson states in order to understand not only
the masses but, in some cases, unexpected decay properties. In this work we
will review how the naive quark model can be complemented with the coupling to
two hadron thresholds. This program has been already applied to the heavy meson
spectrum with the chiral quark model and we show some examples where thresholds
are of special relevance.
| [
{
"created": "Fri, 18 Dec 2020 08:31:56 GMT",
"version": "v1"
}
] | 2020-12-21 | [
[
"Ortega",
"Pablo G.",
""
],
[
"Entem",
"David R.",
""
]
] | Heavy hadron spectroscopy was well understood within the naive quark model until the end of the past century. However, in 2003, the $X(3872)$ was discovered, with puzzling properties difficult to understand in the simple naive quark model picture. This state made clear that excited states of heavy mesons should be coupled to two-meson states in order to understand not only the masses but, in some cases, unexpected decay properties. In this work we will review how the naive quark model can be complemented with the coupling to two hadron thresholds. This program has been already applied to the heavy meson spectrum with the chiral quark model and we show some examples where thresholds are of special relevance. |
2012.06089 | Kirill Tuchin | Jeremy Hansen and Kirill Tuchin | Collisional energy loss and the Chiral Magnetic Effect | 13 pages, 2 figures | Phys. Rev. C 104, 034903 (2021) | 10.1103/PhysRevC.104.034903 | null | hep-ph cond-mat.mes-hall nucl-th | http://creativecommons.org/licenses/by/4.0/ | Collisional energy loss of a fast particle in a medium is mostly due to the
medium polarization by the electromagnetic fields of the particle. A small
fraction of energy is carried away by the Cherenkov radiation. In chiral medium
there is an additional contribution to the energy loss due to induction of the
anomalous current proportional to the magnetic field. It causes the particle to
lose energy mostly in the form of the \emph{chiral} Cherenkov radiation. We
employ classical electrodynamics, adequate in a wide range of particle
energies, to compute the collisional energy loss by a fast particle in a
homogenous chiral plasma and apply the results to Quark-Gluon Plasma and a Weyl
semimetal. In the later case photon spectrum is strongly enhanced in the
ultraviolet and X-ray regions which makes it amenable to experimental
investigation. Our main observation is that while the collisional energy loss
in a non-chiral medium is a slow, at most logarithmic, function of energy $E$,
the chiral Cherenkov radiation is proportional to $E^2$ when the recoil is
neglected and to $E$ when it is taken into account.
| [
{
"created": "Fri, 11 Dec 2020 02:59:11 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Hansen",
"Jeremy",
""
],
[
"Tuchin",
"Kirill",
""
]
] | Collisional energy loss of a fast particle in a medium is mostly due to the medium polarization by the electromagnetic fields of the particle. A small fraction of energy is carried away by the Cherenkov radiation. In chiral medium there is an additional contribution to the energy loss due to induction of the anomalous current proportional to the magnetic field. It causes the particle to lose energy mostly in the form of the \emph{chiral} Cherenkov radiation. We employ classical electrodynamics, adequate in a wide range of particle energies, to compute the collisional energy loss by a fast particle in a homogenous chiral plasma and apply the results to Quark-Gluon Plasma and a Weyl semimetal. In the later case photon spectrum is strongly enhanced in the ultraviolet and X-ray regions which makes it amenable to experimental investigation. Our main observation is that while the collisional energy loss in a non-chiral medium is a slow, at most logarithmic, function of energy $E$, the chiral Cherenkov radiation is proportional to $E^2$ when the recoil is neglected and to $E$ when it is taken into account. |
1907.00129 | Weihua Yang | Weihua Yang | Parity-odd Parton Distribution Functions from $\theta$-Vacuum | arXiv admin note: text overlap with arXiv:1906.03427 | null | 10.1142/S0217751X19501458 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum chromodynamics is a fundamental non-abelian gauge theory of strong
interactions. The physical quantum chromodynamics vacuum state,
$|\theta\rangle$, is a linear superposition of the $n$-vacua states with
different topological numbers. Because of the configuration of the gauge
fields, the tunneling events can induce the local parity-odd domains. Those
interactions that occur in these domains can be affected by these effects.
Considering the hadron (nucleon) system, we introduce the parity-odd parton
distribution functions in order to describe the parity-odd structures inside
the hadron in this paper. We obtain 8 parity-odd parton distribution functions
at leading twist for spin-1/2 hadrons and present properties of these parton
distribution functions. By introducing the parity-odd quark-quark correlator,
we find the parity-odd effects vanish from the macroscopic point of view. Since
the parity-odd effects are confined in small domains, we consider the high
energy semi-inclusive deeply inelastic scattering process to investigate these
effects by calculating the single spin asymmetries.
| [
{
"created": "Sat, 29 Jun 2019 01:56:56 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2020 02:29:28 GMT",
"version": "v2"
}
] | 2020-04-30 | [
[
"Yang",
"Weihua",
""
]
] | Quantum chromodynamics is a fundamental non-abelian gauge theory of strong interactions. The physical quantum chromodynamics vacuum state, $|\theta\rangle$, is a linear superposition of the $n$-vacua states with different topological numbers. Because of the configuration of the gauge fields, the tunneling events can induce the local parity-odd domains. Those interactions that occur in these domains can be affected by these effects. Considering the hadron (nucleon) system, we introduce the parity-odd parton distribution functions in order to describe the parity-odd structures inside the hadron in this paper. We obtain 8 parity-odd parton distribution functions at leading twist for spin-1/2 hadrons and present properties of these parton distribution functions. By introducing the parity-odd quark-quark correlator, we find the parity-odd effects vanish from the macroscopic point of view. Since the parity-odd effects are confined in small domains, we consider the high energy semi-inclusive deeply inelastic scattering process to investigate these effects by calculating the single spin asymmetries. |
1804.01966 | Kirill Boguslavski | K. Boguslavski, A. Kurkela, T. Lappi and J. Peuron | Spectral function for overoccupied gluodynamics from real-time lattice
simulations | 20 pages, 15 figures; v2: published version - references and
footnotes added, minor revisions in the Abstract and Secs. III.E and IV | Phys. Rev. D 98, 014006 (2018) | 10.1103/PhysRevD.98.014006 | CERN-TH-2018-075 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spectral properties of a highly occupied non-Abelian
non-equilibrium plasma appearing ubiquitously in weak coupling descriptions of
QCD matter. The spectral function of this far-from-equilibrium plasma is
measured by employing linear response theory in classical-statistical real-time
lattice Yang-Mills simulations. We establish the existence of transversely and
longitudinally polarized quasiparticles and obtain their dispersion relations,
effective mass, plasmon frequency, damping rate and further structures in the
spectral and statistical functions. Our new method can be interpreted as a
non-perturbative generalization of hard thermal loop (HTL) effective theory. We
see indications that our results approach leading order HTL in the appropriate
limit. The method can also be employed beyond the range of validity of HTL.
| [
{
"created": "Thu, 5 Apr 2018 17:30:05 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2018 10:45:42 GMT",
"version": "v2"
}
] | 2018-11-30 | [
[
"Boguslavski",
"K.",
""
],
[
"Kurkela",
"A.",
""
],
[
"Lappi",
"T.",
""
],
[
"Peuron",
"J.",
""
]
] | We study the spectral properties of a highly occupied non-Abelian non-equilibrium plasma appearing ubiquitously in weak coupling descriptions of QCD matter. The spectral function of this far-from-equilibrium plasma is measured by employing linear response theory in classical-statistical real-time lattice Yang-Mills simulations. We establish the existence of transversely and longitudinally polarized quasiparticles and obtain their dispersion relations, effective mass, plasmon frequency, damping rate and further structures in the spectral and statistical functions. Our new method can be interpreted as a non-perturbative generalization of hard thermal loop (HTL) effective theory. We see indications that our results approach leading order HTL in the appropriate limit. The method can also be employed beyond the range of validity of HTL. |
2309.07686 | Gustavo Gil da Silveira | G. Sampaio dos Santos, G. Gil da Silveira, M. V. T. Machado | Double charmed meson production in $pp$ and $pA$ collisions at the LHC
within the dipole approach in momentum representation | 20 pages, 4 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | A study of double charmed meson production in proton-proton and
proton-nucleus collisions at the LHC energies is performed. Based on the color
dipole formalism developed in the transverse momentum representation and the
double parton scattering mechanism, predictions are made for the transverse
momentum differential cross section for different pairs of $D$-mesons. The
theoretical results consider the center-of-mass energy and forward rapidities
associated to the measurements by the LHCb Collaboration. The results
considering different unintegrated gluon distributions are presented and
compared to data and predictions for proton-nucleus collisions are provided.
| [
{
"created": "Thu, 14 Sep 2023 12:59:43 GMT",
"version": "v1"
}
] | 2023-09-15 | [
[
"Santos",
"G. Sampaio dos",
""
],
[
"da Silveira",
"G. Gil",
""
],
[
"Machado",
"M. V. T.",
""
]
] | A study of double charmed meson production in proton-proton and proton-nucleus collisions at the LHC energies is performed. Based on the color dipole formalism developed in the transverse momentum representation and the double parton scattering mechanism, predictions are made for the transverse momentum differential cross section for different pairs of $D$-mesons. The theoretical results consider the center-of-mass energy and forward rapidities associated to the measurements by the LHCb Collaboration. The results considering different unintegrated gluon distributions are presented and compared to data and predictions for proton-nucleus collisions are provided. |
hep-ph/9405390 | null | R.B. Nevzorov, A.V. Novikov, M.I. Vysotsky | A Simple Way to Estimate the Value of $\bar{\alpha}\equiv\alpha(m^2_Z)$ | LaTex, 6 pages, preprint # FTUV/94-27, IFIC/94-25 | JETP Lett. 60 (1994) 399-403 | null | null | hep-ph | null | To obtain the value of electromagnetic coupling constant at $q^2=m^2_Z$,
$\bar{\alpha}$, which plays a key role in electroweak physics one has to
integrate the cross-section of $e^+e^-$-annihilation into hadrons divided by
$(s-m^2_Z)$ over $s$ from threshold to infinity. By combining, for each flavor
channel, the contribution of lowest resonance with the perturbative QCD
continuum, we obtain $1/\bar{\alpha} = 128.90\pm 0.06 $ a result which is close
to known result obtained with purely experimental inputs, i.e. $1/\bar{\alpha}
= 128.87\pm 0.12$.
| [
{
"created": "Thu, 26 May 1994 18:50:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nevzorov",
"R. B.",
""
],
[
"Novikov",
"A. V.",
""
],
[
"Vysotsky",
"M. I.",
""
]
] | To obtain the value of electromagnetic coupling constant at $q^2=m^2_Z$, $\bar{\alpha}$, which plays a key role in electroweak physics one has to integrate the cross-section of $e^+e^-$-annihilation into hadrons divided by $(s-m^2_Z)$ over $s$ from threshold to infinity. By combining, for each flavor channel, the contribution of lowest resonance with the perturbative QCD continuum, we obtain $1/\bar{\alpha} = 128.90\pm 0.06 $ a result which is close to known result obtained with purely experimental inputs, i.e. $1/\bar{\alpha} = 128.87\pm 0.12$. |
hep-ph/9601354 | Massimo Blasone | E.Alfinito, M.Blasone, A.Iorio and G.Vitiello | Neutrino Mixing and Oscillations in Quantum Field Theory | 13 pages, LaTex + 1 figure. Talk given at the XIXth International
Conference on Particle Physics and Astrophysics in the Standard Model and
Beyond, Bystra, Poland, September 19-26, 1995 | Acta Phys.Polon. B27 (1996) 1493-1502 | null | null | hep-ph astro-ph hep-th | null | We show that the generator of field mixing transformations in Quantum Field
Theory induces a non trivial structure in the vacuum which turns out to be a
coherent state, both for bosons and for fermions, although with a different
condensate structure. The Fock space for mixed fields is unitarily inequivalent
to the Fock space of the massive (free) fields in the infinite volume limit. As
a practical application we study neutrino mixing and oscillations. A new
oscillation formula is found where the oscillation amplitude is depressed, with
respect to the usual one, by a factor which is momentum and mass dependent. In
the relativistic limit, the usual formula is recovered. We finally discuss in
some detail phenomenological features of the modified oscillation formula.
| [
{
"created": "Mon, 29 Jan 1996 14:00:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alfinito",
"E.",
""
],
[
"Blasone",
"M.",
""
],
[
"Iorio",
"A.",
""
],
[
"Vitiello",
"G.",
""
]
] | We show that the generator of field mixing transformations in Quantum Field Theory induces a non trivial structure in the vacuum which turns out to be a coherent state, both for bosons and for fermions, although with a different condensate structure. The Fock space for mixed fields is unitarily inequivalent to the Fock space of the massive (free) fields in the infinite volume limit. As a practical application we study neutrino mixing and oscillations. A new oscillation formula is found where the oscillation amplitude is depressed, with respect to the usual one, by a factor which is momentum and mass dependent. In the relativistic limit, the usual formula is recovered. We finally discuss in some detail phenomenological features of the modified oscillation formula. |
2210.15019 | Roland E. Allen | Bailey Tallman, Alexandra Boone, Adhithya Vijayakumar, Fiona Lopez,
Samuel Apata, Jehu Martinez, and Roland Allen | Potential for definitive discovery of a 70 GeV dark matter WIMP with
only second-order gauge couplings | 6 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As astronomical observations and their interpretation improve, the case for
cold dark matter (CDM) becomes increasingly persuasive. A particularly
appealing version of CDM is a weakly interacting massive particle (WIMP) with a
mass near the electroweak scale, which can naturally have the observed relic
abundance after annihilation in the early universe. But in order for a WIMP to
be consistent with the currently stringent experimental constraints it must
have relatively small cross-sections for indirect, direct, and collider
detection. Using our calculations and estimates of these cross-sections, we
discuss the potential for discovery of a recently proposed dark matter WIMP
which has a mass of about 70 GeV/c$^2$ and only second-order couplings to W and
Z bosons. There is evidence that indirect detection may already have been
achieved, since analyses of the gamma rays detected by Fermi-LAT and the
antiprotons observed by AMS-02 are consistent with 70 GeV dark matter having
our calculated $\langle \sigma_{ann} v \rangle \approx 1.2 \times 10^{-26} $
cm$^3$/s. The estimated sensitivities for LZ and XENONnT indicate that these
experiments may achieve direct detection within the next few years, since we
estimate the relevant cross-section to be slightly above $10^{-48}$ cm$^2$.
Other experiments such as PandaX, SuperCDMS, and especially DARWIN should be
able to confirm on a longer time scale. The high-luminosity LHC might achieve
collider detection within about 15 years, since we estimate a collider
cross-section slightly below 1 femtobarn. Definitive confirmation should come
from still more powerful planned collider experiments (such as a future
circular collider) within 15-35 years.
| [
{
"created": "Mon, 24 Oct 2022 22:56:41 GMT",
"version": "v1"
}
] | 2022-10-28 | [
[
"Tallman",
"Bailey",
""
],
[
"Boone",
"Alexandra",
""
],
[
"Vijayakumar",
"Adhithya",
""
],
[
"Lopez",
"Fiona",
""
],
[
"Apata",
"Samuel",
""
],
[
"Martinez",
"Jehu",
""
],
[
"Allen",
"Roland",
""
]
] | As astronomical observations and their interpretation improve, the case for cold dark matter (CDM) becomes increasingly persuasive. A particularly appealing version of CDM is a weakly interacting massive particle (WIMP) with a mass near the electroweak scale, which can naturally have the observed relic abundance after annihilation in the early universe. But in order for a WIMP to be consistent with the currently stringent experimental constraints it must have relatively small cross-sections for indirect, direct, and collider detection. Using our calculations and estimates of these cross-sections, we discuss the potential for discovery of a recently proposed dark matter WIMP which has a mass of about 70 GeV/c$^2$ and only second-order couplings to W and Z bosons. There is evidence that indirect detection may already have been achieved, since analyses of the gamma rays detected by Fermi-LAT and the antiprotons observed by AMS-02 are consistent with 70 GeV dark matter having our calculated $\langle \sigma_{ann} v \rangle \approx 1.2 \times 10^{-26} $ cm$^3$/s. The estimated sensitivities for LZ and XENONnT indicate that these experiments may achieve direct detection within the next few years, since we estimate the relevant cross-section to be slightly above $10^{-48}$ cm$^2$. Other experiments such as PandaX, SuperCDMS, and especially DARWIN should be able to confirm on a longer time scale. The high-luminosity LHC might achieve collider detection within about 15 years, since we estimate a collider cross-section slightly below 1 femtobarn. Definitive confirmation should come from still more powerful planned collider experiments (such as a future circular collider) within 15-35 years. |
1212.6075 | Hyun-Chul Kim | Hui-Young Ryu, Alexander I. Titov, Atsushi Hosaka, and Hyun-Chul Kim | $\phi$ photoprodution with coupled-channel effects | 17 pages | null | 10.1093/ptep/ptu004 | INHA-NTG-06/2012 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study phi photoproduction with various hadronic rescattering contributions
included, in addition to the Pomeron and pseudoscalar meson-exchange diagrams.
We find that the hadronic box diagrams can explain the recent experimental data
in the vicinity of the threshold. In particular, the bump-like structure at the
photon energy E_gamma \approx 2.3$ GeV is well explained by the K Lambda(1520)
rescattering amplitude in the intermediate state, which is the dominant
contribution among other hadronic contributions. We also find that the hadronic
box diagrams are consistent with the observed spin-density matrix elements near
the threshold region.
| [
{
"created": "Tue, 25 Dec 2012 19:07:45 GMT",
"version": "v1"
}
] | 2014-05-07 | [
[
"Ryu",
"Hui-Young",
""
],
[
"Titov",
"Alexander I.",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | We study phi photoproduction with various hadronic rescattering contributions included, in addition to the Pomeron and pseudoscalar meson-exchange diagrams. We find that the hadronic box diagrams can explain the recent experimental data in the vicinity of the threshold. In particular, the bump-like structure at the photon energy E_gamma \approx 2.3$ GeV is well explained by the K Lambda(1520) rescattering amplitude in the intermediate state, which is the dominant contribution among other hadronic contributions. We also find that the hadronic box diagrams are consistent with the observed spin-density matrix elements near the threshold region. |
1804.07171 | Marco Catillo | M. Catillo and L. Ya. Glozman | Baryon parity doublets and chiralspin symmetry | To appear in PRD | Phys. Rev. D 98, 014030 (2018) | 10.1103/PhysRevD.98.014030 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The chirally symmetric baryon parity-doublet model can be used as an
effective description of the baryon-like objects in the chirally symmetric
phase of QCD. Recently it has been found that above the critical temperature
higher chiralspin symmetries emerge in QCD. It is demonstrated here that the
baryon parity-doublet Lagrangian is manifestly chiralspin-invariant. We
construct nucleon interpolators with fixed chiralspin transformation properties
that can be used in lattice studies at high T.
| [
{
"created": "Thu, 19 Apr 2018 13:52:51 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jun 2018 12:34:33 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Catillo",
"M.",
""
],
[
"Glozman",
"L. Ya.",
""
]
] | The chirally symmetric baryon parity-doublet model can be used as an effective description of the baryon-like objects in the chirally symmetric phase of QCD. Recently it has been found that above the critical temperature higher chiralspin symmetries emerge in QCD. It is demonstrated here that the baryon parity-doublet Lagrangian is manifestly chiralspin-invariant. We construct nucleon interpolators with fixed chiralspin transformation properties that can be used in lattice studies at high T. |
hep-ph/0601234 | Peter Lichard | Peter Lichard and Josef Juran | Electron-positron annihilation into four charged pions and the
a_1-rho-pi Lagrangian | 15 pages, 6 figures. Largely extended. The title changed to reflect
new content | Phys.Rev.D76:094030,2007 | 10.1103/PhysRevD.76.094030 | null | hep-ph | null | The excitation curve of e+e- annihilation into four charged pions in the
rho(770) region is calculated using three existing models with rho mesons and
pions in intermediate states supplemented by Feynman diagrams with the
a_1(1260)pi intermediate states. A two-term phenomenological Lagrangian of the
a_1-rho-pi interaction is used. The mixing angle is determined by fitting the
e+e- --> pi+pi-pi+pi- cross section data of the Novosibirsk CMD-2 collaboration
and also its combination with the low-energy part of the BaBar collaboration
data. It is shown that the inclusion of the a_1-pi intermediate states succeeds
in obtaining a good agreement with the data on both cross section and the rho^0
--> pi+pi-pi+pi- decay width. When moving to energies above 1 GeV, the
rho(1450) and rho(1700) resonances are taken into account to get excellent
agreement with the BaBar data over the full energy range up to 4.5 GeV.
| [
{
"created": "Fri, 27 Jan 2006 17:10:50 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2007 22:04:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lichard",
"Peter",
""
],
[
"Juran",
"Josef",
""
]
] | The excitation curve of e+e- annihilation into four charged pions in the rho(770) region is calculated using three existing models with rho mesons and pions in intermediate states supplemented by Feynman diagrams with the a_1(1260)pi intermediate states. A two-term phenomenological Lagrangian of the a_1-rho-pi interaction is used. The mixing angle is determined by fitting the e+e- --> pi+pi-pi+pi- cross section data of the Novosibirsk CMD-2 collaboration and also its combination with the low-energy part of the BaBar collaboration data. It is shown that the inclusion of the a_1-pi intermediate states succeeds in obtaining a good agreement with the data on both cross section and the rho^0 --> pi+pi-pi+pi- decay width. When moving to energies above 1 GeV, the rho(1450) and rho(1700) resonances are taken into account to get excellent agreement with the BaBar data over the full energy range up to 4.5 GeV. |
hep-ph/9912333 | Aldo Deandrea | R. Casalbuoni, A. Deandrea, S. De Curtis, D. Dominici, R. Gatto and J.
F. Gunion | The Lightest Pseudo-Goldstone Boson at Future e+e- Colliders | 15 pages, 8 figures, LaTeX (epsfig), Proceedings of the Second
ECFA/DESY Study on Physics Studies for a Future Linear Collider | null | null | LC-TH-1999-013 | hep-ph | null | In a class of models of dynamical symmetry breaking not ruled out by the
available data, the lightest neutral pseudo-Nambu-Goldstone boson P0 contains
only down-type techniquarks and charged technileptons. Its mass scale is
naturally determined by the b-quark and therefore it is likely to be light. As
the presence of pseudo-Nambu-Goldstone bosons in models of dynamical symmetry
breaking is a quite general feature, the search of the P0 at colliders is an
interesting opportunity of putting limits on or discovering a dynamical
electroweak symmetry breaking scenario. In this note we discuss the prospects
for discovering and studying the P0 at future e+e- and gamma-gamma colliders.
| [
{
"created": "Tue, 14 Dec 1999 13:12:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Casalbuoni",
"R.",
""
],
[
"Deandrea",
"A.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Dominici",
"D.",
""
],
[
"Gatto",
"R.",
""
],
[
"Gunion",
"J. F.",
""
]
] | In a class of models of dynamical symmetry breaking not ruled out by the available data, the lightest neutral pseudo-Nambu-Goldstone boson P0 contains only down-type techniquarks and charged technileptons. Its mass scale is naturally determined by the b-quark and therefore it is likely to be light. As the presence of pseudo-Nambu-Goldstone bosons in models of dynamical symmetry breaking is a quite general feature, the search of the P0 at colliders is an interesting opportunity of putting limits on or discovering a dynamical electroweak symmetry breaking scenario. In this note we discuss the prospects for discovering and studying the P0 at future e+e- and gamma-gamma colliders. |
0909.4419 | Andrew Akeroyd | A.G. Akeroyd, Cheng-Wei Chiang | Doubly charged Higgs bosons and three-lepton signatures in the Higgs
Triplet Model | 13 pages, 12 figures | Phys.Rev.D80:113010,2009 | 10.1103/PhysRevD.80.113010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Doubly charged Higgs bosons, H^{\pm\pm}, are being searched for in the
Tevatron experiments. The most recent search by the D0 collaboration seeks
three muons (mu^\pm\mu^\pm\mu^\mp), which are assumed to originate from the
pair-production process, q\overline q\to H^{++}H^{--}, followed by the decay
H^{\pm\pm} \to \mu^\pm \mu^\pm. In this three-lepton (3l) channel there are six
distinct signatures for l=e or \mu. In the context of the Higgs Triplet Model,
we quantify the dependence of the event numbers for the 3l channels on the
parameters of the neutrino mass matrix. It is also shown that the inclusion of
the production mechanism q \overline{q'} \to H^{\pm\pm}H^{\mp}, followed by the
decay H^\pm\to l^ \pm\nu, would significantly increase the discovery potential
in these channels. We then provide perspectives on the production of these
channels at the Tevatron and LHC.
| [
{
"created": "Thu, 24 Sep 2009 12:00:34 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Akeroyd",
"A. G.",
""
],
[
"Chiang",
"Cheng-Wei",
""
]
] | Doubly charged Higgs bosons, H^{\pm\pm}, are being searched for in the Tevatron experiments. The most recent search by the D0 collaboration seeks three muons (mu^\pm\mu^\pm\mu^\mp), which are assumed to originate from the pair-production process, q\overline q\to H^{++}H^{--}, followed by the decay H^{\pm\pm} \to \mu^\pm \mu^\pm. In this three-lepton (3l) channel there are six distinct signatures for l=e or \mu. In the context of the Higgs Triplet Model, we quantify the dependence of the event numbers for the 3l channels on the parameters of the neutrino mass matrix. It is also shown that the inclusion of the production mechanism q \overline{q'} \to H^{\pm\pm}H^{\mp}, followed by the decay H^\pm\to l^ \pm\nu, would significantly increase the discovery potential in these channels. We then provide perspectives on the production of these channels at the Tevatron and LHC. |
hep-ph/9803415 | Qiuyu Liu | Q.Y. Liu (SISSA, Trieste), S.P. Mikheyev (Gran Sasso & Moscow, INR),
A.Yu. Smirnov (ICTP, Trieste & Moscow, INR) | Parametric Resonance in Oscillations of Atmospheric Neutrinos? | 14 pages + 9 eps figures in 6 pages, Latex file | Phys.Lett. B440 (1998) 319-326 | 10.1016/S0370-2693(98)01102-2 | IC/98/30 | hep-ph hep-ex nucl-ex | null | We consider a solution of the atmospheric neutrino problem based on
oscillations of muon neutrinos to sterile neutrinos: $\nu_{\mu}$
$\leftrightarrow$ $\nu_s$. The zenith angle ($\Theta$) dependences of the
neutrino and upward-going muon fluxes in presence of these oscillations are
studied. The dependences have characteristic form with two dips: at $\cos
\Theta = -0.6 \div -0.2$ and $\cos \Theta = -1.0 \div -0.8$. The latter dip is
due to parametric resonance in oscillations of neutrinos which cross the core
of the earth. A comparison of predictions with data from the MACRO, Baksan and
Super-Kamiokande experiments is given.
| [
{
"created": "Sat, 21 Mar 1998 17:28:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Liu",
"Q. Y.",
"",
"SISSA, Trieste"
],
[
"Mikheyev",
"S. P.",
"",
"Gran Sasso & Moscow, INR"
],
[
"Smirnov",
"A. Yu.",
"",
"ICTP, Trieste & Moscow, INR"
]
] | We consider a solution of the atmospheric neutrino problem based on oscillations of muon neutrinos to sterile neutrinos: $\nu_{\mu}$ $\leftrightarrow$ $\nu_s$. The zenith angle ($\Theta$) dependences of the neutrino and upward-going muon fluxes in presence of these oscillations are studied. The dependences have characteristic form with two dips: at $\cos \Theta = -0.6 \div -0.2$ and $\cos \Theta = -1.0 \div -0.8$. The latter dip is due to parametric resonance in oscillations of neutrinos which cross the core of the earth. A comparison of predictions with data from the MACRO, Baksan and Super-Kamiokande experiments is given. |
hep-ph/0411387 | Szymanowski Lech dr | B. Pire and L. Szymanowski | Hadron annihilation into two photons and backward dVCS in the scaling
regime of QCD | 4 pages, 1 .eps figure, to be published in Phys. Rev. D Rapid Comm | Phys.Rev. D71 (2005) 111501 | 10.1103/PhysRevD.71.111501 | null | hep-ph | null | We study the scaling regime of hadron-(anti)-hadron annihilation into a
deeply virtual photon and a real photon, H anti-H -> gamma^* gamma, and deep
backward virtual Compton scattering, gamma^* H -> H gamma. We advocate that
there is a kinematical region where the scattering amplitude factorizes into a
short-distance matrix element and a long-distance dominated object: a
transition distribution amplitude which describes the hadron to photon
transition.
| [
{
"created": "Tue, 30 Nov 2004 15:09:55 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2005 09:38:41 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
]
] | We study the scaling regime of hadron-(anti)-hadron annihilation into a deeply virtual photon and a real photon, H anti-H -> gamma^* gamma, and deep backward virtual Compton scattering, gamma^* H -> H gamma. We advocate that there is a kinematical region where the scattering amplitude factorizes into a short-distance matrix element and a long-distance dominated object: a transition distribution amplitude which describes the hadron to photon transition. |
1505.00264 | Zijie Poh | Zijie Poh, Stuart Raby | Yukawa Unification in an SO(10) SUSY GUT: SUSY on the Edge | 23 pages, 3 figures, 9 tables; Changed title, added references for
Section 3.2; Typos corrected | Phys. Rev. D 92, 015017 (2015) | 10.1103/PhysRevD.92.015017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we analyze Yukawa unification in a three family SO(10) SUSY
GUT. We perform a global $\chi^2$ analysis and show that SUSY effects do not
decouple even though the universal scalar mass parameter at the GUT scale,
$m_{16}$, is found to lie between 15 and 30 TeV with the best fit given for
$m_{16} \approx 25$ TeV. Note, SUSY effects don't decouple since stops and
bottoms have mass of order 5 TeV, due to RG running from $M_{GUT}$. The model
has many testable predictions. Gauginos are the lightest sparticles and the
light Higgs boson is very much Standard Model-like. The model is consistent
with flavor and CP observables with the $BR(\mu \to e\gamma)$ close to the
experimental upper bound. With such a large value of $m_{16}$ we clearly cannot
be considered "natural" SUSY nor are we "Split" SUSY. We are thus in the region
in between or "SUSY on the Edge."
| [
{
"created": "Fri, 1 May 2015 20:00:28 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 2015 16:29:47 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Mar 2016 16:06:22 GMT",
"version": "v3"
}
] | 2016-03-29 | [
[
"Poh",
"Zijie",
""
],
[
"Raby",
"Stuart",
""
]
] | In this paper we analyze Yukawa unification in a three family SO(10) SUSY GUT. We perform a global $\chi^2$ analysis and show that SUSY effects do not decouple even though the universal scalar mass parameter at the GUT scale, $m_{16}$, is found to lie between 15 and 30 TeV with the best fit given for $m_{16} \approx 25$ TeV. Note, SUSY effects don't decouple since stops and bottoms have mass of order 5 TeV, due to RG running from $M_{GUT}$. The model has many testable predictions. Gauginos are the lightest sparticles and the light Higgs boson is very much Standard Model-like. The model is consistent with flavor and CP observables with the $BR(\mu \to e\gamma)$ close to the experimental upper bound. With such a large value of $m_{16}$ we clearly cannot be considered "natural" SUSY nor are we "Split" SUSY. We are thus in the region in between or "SUSY on the Edge." |
hep-ph/0612337 | Tomohito Maeda | Kenji Yamada (Nihon Univ.) | Properties of the Ground-State q bar q Mesons and Possible
Classification of Observed Mesons in the U~(12)_SF X O(3,1)_L Scheme | 12 pages, based on a talk presented at the IHEP Seminar on
Perspectives for Studies of Chiral Particles at BES, Institute of High Energy
Physics, Beijing, February 23-24, 2006, KEK Proceedings 2006-8, November 2006 | null | null | null | hep-ph | null | We examine possible assignments for known mesons to the predicted
ground-state q bar q multiplets in the U~(12)_SF-classification scheme of
hadrons, based on their observed properties. The masses of missing members of
the ground-state multiplets are estimated, using a phenomenological mixing
scheme for the normal- and extra-spin wave functions specific to this
classification scheme. We also examine experimental candidates for the excited
1P, 1D and 2S multiplets in a framework of the U~(12)_SF X
O(3,1)_L-classification scheme, based on the analysis of the ground-state
masses. Then we see that the two exotic mesons pi_1(1400) and pi_1(1600) with
J^PC=1^-+ have suitable masses to be assigned to the P-wave excitation and also
there are a number of observed mesonic states which could be classified in
terms of the U~(12)_SF X O(3,1)_L scheme.
| [
{
"created": "Wed, 27 Dec 2006 12:33:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yamada",
"Kenji",
"",
"Nihon Univ."
]
] | We examine possible assignments for known mesons to the predicted ground-state q bar q multiplets in the U~(12)_SF-classification scheme of hadrons, based on their observed properties. The masses of missing members of the ground-state multiplets are estimated, using a phenomenological mixing scheme for the normal- and extra-spin wave functions specific to this classification scheme. We also examine experimental candidates for the excited 1P, 1D and 2S multiplets in a framework of the U~(12)_SF X O(3,1)_L-classification scheme, based on the analysis of the ground-state masses. Then we see that the two exotic mesons pi_1(1400) and pi_1(1600) with J^PC=1^-+ have suitable masses to be assigned to the P-wave excitation and also there are a number of observed mesonic states which could be classified in terms of the U~(12)_SF X O(3,1)_L scheme. |
hep-ph/0501238 | Bohdan Grzadkowski | Bohdan Grzadkowski (Warsaw U.), Jose Wudka (UC, Riverside) | Majorana Fermions and CP Violation from 5-dimensional Theories; a
Systematic Approach | null | Phys.Rev. D72 (2005) 125012 | 10.1103/PhysRevD.72.125012 | IFT-05-01, UCRHEP-T384 | hep-ph hep-th | null | Within five-dimensional compactified theories we discuss generalized
periodicity and orbifold boundary conditions that allow for mixing between
particles and anti-particles after a shift by the size of extra dimensions or
after the orbifold reflection. A systematic strategy for constructing
4-dimensional models is presented, in particular we find a general form of the
periodicity and orbifold conditions that are allowed by consistency
requirements. We formulate general conditions for a presence of massless
Kaluza-Klein modes and discuss remaining gauge symmetry of the zero-mode
sector. It is shown that if the orbifold twist operation transforms particles
into anti-particles then the zero-mode fermions are 4-dimensional Majorana
fermions. The possibility of explicit and spontaneous CP violation is
discussed. General considerations are illustrated by many Abelian and
non-Abelian examples.
| [
{
"created": "Wed, 26 Jan 2005 00:49:09 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Grzadkowski",
"Bohdan",
"",
"Warsaw U."
],
[
"Wudka",
"Jose",
"",
"UC, Riverside"
]
] | Within five-dimensional compactified theories we discuss generalized periodicity and orbifold boundary conditions that allow for mixing between particles and anti-particles after a shift by the size of extra dimensions or after the orbifold reflection. A systematic strategy for constructing 4-dimensional models is presented, in particular we find a general form of the periodicity and orbifold conditions that are allowed by consistency requirements. We formulate general conditions for a presence of massless Kaluza-Klein modes and discuss remaining gauge symmetry of the zero-mode sector. It is shown that if the orbifold twist operation transforms particles into anti-particles then the zero-mode fermions are 4-dimensional Majorana fermions. The possibility of explicit and spontaneous CP violation is discussed. General considerations are illustrated by many Abelian and non-Abelian examples. |
hep-ph/0407173 | Soeren Wiesenfeldt | S. Wiesenfeldt | Proton Decay in Supersymmetric GUT Models | DESY report number corrected | Mod.Phys.Lett. A19 (2004) 2155 | 10.1142/S0217732304015452 | DESY 04-125 | hep-ph hep-ex | null | The instability of protons is a crucial prediction of supersymmetric GUTs. We
review the decay in minimal supersymmetric SU(5), which is dominated by
dimension-five operators, and discuss the implications of the failure of Yukawa
unification for the decay rate. In a consistent SU(5) model, where SU(5)
relations among Yukawa couplings hold, the proton decay rate can be several
orders of magnitude smaller than the present experimental bound. Finally, we
discuss orbifold GUTs, where proton decay via dimension-five operators is
absent. The branching ratios of dimension-six decay can significantly differ
from those in four dimensions.
| [
{
"created": "Thu, 15 Jul 2004 17:28:48 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2004 19:01:22 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Sep 2004 14:37:07 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Wiesenfeldt",
"S.",
""
]
] | The instability of protons is a crucial prediction of supersymmetric GUTs. We review the decay in minimal supersymmetric SU(5), which is dominated by dimension-five operators, and discuss the implications of the failure of Yukawa unification for the decay rate. In a consistent SU(5) model, where SU(5) relations among Yukawa couplings hold, the proton decay rate can be several orders of magnitude smaller than the present experimental bound. Finally, we discuss orbifold GUTs, where proton decay via dimension-five operators is absent. The branching ratios of dimension-six decay can significantly differ from those in four dimensions. |
2204.06983 | Peter Matak | Peter Mat\'ak, Tom\'a\v{s} Bla\v{z}ek | Cutting rules on a cylinder and simplified diagrammatic approach to $CP$
violation in quantum kinetic theory | 7th Symposium on Prospects in the Physics of Discrete Symmetries
(DISCRETE 2020-2021) 29th November - 3rd December 2021 | PoS DISCRETE2020-2021 (2022) 080 | 10.22323/1.405.0080 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly explain a novel diagrammatic method for including thermal
corrections in $CP$ asymmetric reaction rates entering the quantum Boltzmann
equation. In thermal equilibrium, the asymmetries have to cancel precisely due
to the $S$-matrix unitarity and $CPT$ invariance. Such cancelations are easy to
track in zero-temperature leading-order calculations. However, accounting for
medium effects requires modification of the on-shell part of propagators and,
consequently, the $CP$ violating rates. In the literature, the correct form of
the statistical factors in the asymmetry source term has been obtained
employing the real-time-formalism of non-equilibrium field theory in a certain
approximation. We demonstrate that the same results can be obtained by summing
an infinite sequence of zero-temperature asymmetries. Those are derived from
cuttings of forward diagrams drawn on a cylindrical surface, while thermal
corrections come from windings of their propagators. The procedure is entirely
diagrammatic, and the $CPT$ and unitarity cancelations are formulated for
thermally corrected reaction rate asymmetries. The simplification achieved is
the primary focus of our work. The aspect of infrared finiteness in
higher-order corrections will also be discussed.
| [
{
"created": "Thu, 14 Apr 2022 14:18:52 GMT",
"version": "v1"
}
] | 2022-04-28 | [
[
"Maták",
"Peter",
""
],
[
"Blažek",
"Tomáš",
""
]
] | We briefly explain a novel diagrammatic method for including thermal corrections in $CP$ asymmetric reaction rates entering the quantum Boltzmann equation. In thermal equilibrium, the asymmetries have to cancel precisely due to the $S$-matrix unitarity and $CPT$ invariance. Such cancelations are easy to track in zero-temperature leading-order calculations. However, accounting for medium effects requires modification of the on-shell part of propagators and, consequently, the $CP$ violating rates. In the literature, the correct form of the statistical factors in the asymmetry source term has been obtained employing the real-time-formalism of non-equilibrium field theory in a certain approximation. We demonstrate that the same results can be obtained by summing an infinite sequence of zero-temperature asymmetries. Those are derived from cuttings of forward diagrams drawn on a cylindrical surface, while thermal corrections come from windings of their propagators. The procedure is entirely diagrammatic, and the $CPT$ and unitarity cancelations are formulated for thermally corrected reaction rate asymmetries. The simplification achieved is the primary focus of our work. The aspect of infrared finiteness in higher-order corrections will also be discussed. |
hep-ph/9811404 | Marek Nowakowski | B. Ancochea, A. Bramon and M. Nowakowski | Bell-inequalities for $K^0 \bar{K^0}$ Pairs from $\Phi$-Resonance Decays | 22 pages. Latex | Phys.Rev. D60 (1999) 094008 | 10.1103/PhysRevD.60.094008 | UAB-FT-459/98, IFT-P.087/98 | hep-ph quant-ph | null | We analyze the premises of recent propositions to test local realism via
Bell-inequalities using neutral kaons from $\Phi$-resonance decays as entangled
EPR-pairs. We pay special attention to the derivation of Bell-inequalities, or
related expressions, for unstable and oscillating kaon `quasi-spin' states and
to the possibility of the actual identification of these states through their
associated decay modes. We discuss an indirect method to extract probabilities
to find these states by combining experimental information with theoretical
input. However, we still find inconsistencies in previous derivations of
Bell-inequalities. We show that the identification of the quasi-spin states via
their associated decay mode does not allow the free choice to perform different
tests on them, a property which is crucial to establish the validity of any
Bell-inequality in the context of local realism. In view of this we propose a
different kind of Bell-inequality in which the free choice or adjustability of
the experimental set-up is guaranteed. We also show that the proposed
inequalities are violated by quantum mechanics.
| [
{
"created": "Thu, 19 Nov 1998 16:40:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ancochea",
"B.",
""
],
[
"Bramon",
"A.",
""
],
[
"Nowakowski",
"M.",
""
]
] | We analyze the premises of recent propositions to test local realism via Bell-inequalities using neutral kaons from $\Phi$-resonance decays as entangled EPR-pairs. We pay special attention to the derivation of Bell-inequalities, or related expressions, for unstable and oscillating kaon `quasi-spin' states and to the possibility of the actual identification of these states through their associated decay modes. We discuss an indirect method to extract probabilities to find these states by combining experimental information with theoretical input. However, we still find inconsistencies in previous derivations of Bell-inequalities. We show that the identification of the quasi-spin states via their associated decay mode does not allow the free choice to perform different tests on them, a property which is crucial to establish the validity of any Bell-inequality in the context of local realism. In view of this we propose a different kind of Bell-inequality in which the free choice or adjustability of the experimental set-up is guaranteed. We also show that the proposed inequalities are violated by quantum mechanics. |
hep-ph/0007174 | Abdelhak Djouadi | A. Djouadi and Y. Mambrini (LPMT Montpellier) | Three-Body Decays of SUSY Particles | 10 pages with 5 figures + axodraw.sty, latex | Phys.Lett. B493 (2000) 120-126 | 10.1016/S0370-2693(00)01102-3 | PM/00--24 | hep-ph | null | We analyze the decays of charginos, neutralinos, gluinos and the first/second
generation squarks in the Minimal Supersymmetric extension of the Standard
Model, focusing on the three-body decays in scenarios where the ratio $\tan
\beta$ of vacuum expectation values of the two Higgs doublet fields is large.
We show that the three-body decays of the next-to-lightest neutralinos
(lightest charginos) into $b\bar{b},\tau^+\tau^-$ ($\tau \nu$) final states,
where third generation sfermion and Higgs boson exchange diagrams play an
important role, are dominant. Furthermore, we show that decays of gluinos into
$b\bar{b}$ final states and squark decays into lighter sbottoms through gluino
exchange can also have sizeable branching fractions, especially in scenarios
where the soft SUSY breaking gaugino mass parameters are not unified at the GUT
scale.
| [
{
"created": "Mon, 17 Jul 2000 13:40:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Djouadi",
"A.",
"",
"LPMT Montpellier"
],
[
"Mambrini",
"Y.",
"",
"LPMT Montpellier"
]
] | We analyze the decays of charginos, neutralinos, gluinos and the first/second generation squarks in the Minimal Supersymmetric extension of the Standard Model, focusing on the three-body decays in scenarios where the ratio $\tan \beta$ of vacuum expectation values of the two Higgs doublet fields is large. We show that the three-body decays of the next-to-lightest neutralinos (lightest charginos) into $b\bar{b},\tau^+\tau^-$ ($\tau \nu$) final states, where third generation sfermion and Higgs boson exchange diagrams play an important role, are dominant. Furthermore, we show that decays of gluinos into $b\bar{b}$ final states and squark decays into lighter sbottoms through gluino exchange can also have sizeable branching fractions, especially in scenarios where the soft SUSY breaking gaugino mass parameters are not unified at the GUT scale. |
hep-ph/9512390 | J. W. F. Valle | S. Sahu, V.B.Semikoz, J. W. F. Valle | A New Type of Resonant Neutrino Conversions Induced by Magnetic Fields | latex file, 12 pages, 1 figure | null | null | FTUV/95-41; IFIC/95-43 | hep-ph | null | We consider resonant neutrino conversions in magnetised matter, such as a
degenerate electron gas. We show how magnetisation effects caused by axial
vector interactions of neutrinos with the charged leptons in the medium can
induce a new type of resonant neutrino conversion which may occur even in
situations where the MSW effect does not occur, such as the case of degenerate
or inverted neutrino mass spectra. Our new resonance may simultaneously affect
anti-neutrino $\bar{\nu_a} \leftrightarrow \bar{\nu}_b$ as well as neutrino
$\nu_{a} \leftrightarrow \nu_b$ flavour conversions, and therefore it may
substantially affect supernova neutrino energy spectra. Using SN1987A data we
conclude that only laboratory experiments with long baseline such as ICARUS or
MINOS are likely to find neutrino oscillations due to their sensitivity to
small $\Delta m^2$. We also comment on the possibility of resonant conversions
induced by Majorana neutrino transition moments and mention the case of sterile
neutrinos $\nu_s$.
| [
{
"created": "Thu, 21 Dec 1995 09:07:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sahu",
"S.",
""
],
[
"Semikoz",
"V. B.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We consider resonant neutrino conversions in magnetised matter, such as a degenerate electron gas. We show how magnetisation effects caused by axial vector interactions of neutrinos with the charged leptons in the medium can induce a new type of resonant neutrino conversion which may occur even in situations where the MSW effect does not occur, such as the case of degenerate or inverted neutrino mass spectra. Our new resonance may simultaneously affect anti-neutrino $\bar{\nu_a} \leftrightarrow \bar{\nu}_b$ as well as neutrino $\nu_{a} \leftrightarrow \nu_b$ flavour conversions, and therefore it may substantially affect supernova neutrino energy spectra. Using SN1987A data we conclude that only laboratory experiments with long baseline such as ICARUS or MINOS are likely to find neutrino oscillations due to their sensitivity to small $\Delta m^2$. We also comment on the possibility of resonant conversions induced by Majorana neutrino transition moments and mention the case of sterile neutrinos $\nu_s$. |
2211.16053 | Ayodele Ore | Matthew J. Dolan and Ayodele Ore | TopicFlow: Disentangling quark and gluon jets with normalizing flows | 10 pages, 5 figures. v2: Added footnote in Section III B. Added
baseline and related discussion to Section III C. v3: Match published version | Phys. Rev. D 107, 114003 (2023) | 10.1103/PhysRevD.107.114003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The isolation of pure samples of quark and gluon jets is of key interest at
hadron colliders. Recent work has employed topic modeling to disentangle the
underlying distributions in mixed samples obtained from experiments. However,
current implementations do not scale to high-dimensional observables as they
rely on binning the data. In this work we introduce TopicFlow, a method based
on normalizing flows to learn quark and gluon jet topic distributions from
mixed datasets. These networks are as performant as the histogram-based
approach, but since they are unbinned, they are efficient even in high
dimension. The models can also be oversampled to alleviate the statistical
limitations of histograms. As an example use case, we demonstrate how our
models can improve the calibration accuracy of a classifier. Finally, we
discuss how the flow likelihoods can be used to perform outlier-robust
quark/gluon classification.
| [
{
"created": "Tue, 29 Nov 2022 10:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Dec 2022 04:04:47 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Jun 2023 01:37:49 GMT",
"version": "v3"
}
] | 2023-06-05 | [
[
"Dolan",
"Matthew J.",
""
],
[
"Ore",
"Ayodele",
""
]
] | The isolation of pure samples of quark and gluon jets is of key interest at hadron colliders. Recent work has employed topic modeling to disentangle the underlying distributions in mixed samples obtained from experiments. However, current implementations do not scale to high-dimensional observables as they rely on binning the data. In this work we introduce TopicFlow, a method based on normalizing flows to learn quark and gluon jet topic distributions from mixed datasets. These networks are as performant as the histogram-based approach, but since they are unbinned, they are efficient even in high dimension. The models can also be oversampled to alleviate the statistical limitations of histograms. As an example use case, we demonstrate how our models can improve the calibration accuracy of a classifier. Finally, we discuss how the flow likelihoods can be used to perform outlier-robust quark/gluon classification. |
hep-ph/0601193 | Marek Karliner | Marek Karliner and Harry J. Lipkin | Diquarks and antiquarks in exotics: a menage a trois and a menage a
quatre | Journal version (PLB) | Phys.Lett.B638:221-228,2006 | 10.1016/j.physletb.2006.05.032 | TAUP 2817-05, WIS/01/06-JAN-DPP, ANL-HEP-PR-06-4 | hep-ph | null | A menage a trois is very different from an ordinary family. Similarly, exotic
hadrons with both qq and qbar q pairs have important color-space correlations
that are completely absent in ordinary mesons and baryons. The presence of both
types of pairs requires attention to the basic QCD physics that the q qbar
interaction is much stronger than the qq interaction. This new physics in
multiquark systems produces color structures totally different from those of
normal hadrons, for example the ud system is utterly unlike the ud diquark in
the uds Lambda baryon. The color-space correlations produce unusual
experimental properties in tetraquarks with heavy quark pairs which may be
relevant for newly discovered mesons like the X(3872) resonance. Tetraquark
masses can be below the two-meson threshold for sufficiently high quark masses.
A simple model calculation shows the b q bbar ubar and b q cbar qbar
tetraquarks below the B Bbar and B Dbar thresholds. Some of these states have
exotic electric charge and their decays might have striking signatures
involving monoenergetic photons and/or pions.
| [
{
"created": "Mon, 23 Jan 2006 19:25:19 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 2006 15:00:57 GMT",
"version": "v2"
},
{
"created": "Wed, 17 May 2006 19:59:07 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Karliner",
"Marek",
""
],
[
"Lipkin",
"Harry J.",
""
]
] | A menage a trois is very different from an ordinary family. Similarly, exotic hadrons with both qq and qbar q pairs have important color-space correlations that are completely absent in ordinary mesons and baryons. The presence of both types of pairs requires attention to the basic QCD physics that the q qbar interaction is much stronger than the qq interaction. This new physics in multiquark systems produces color structures totally different from those of normal hadrons, for example the ud system is utterly unlike the ud diquark in the uds Lambda baryon. The color-space correlations produce unusual experimental properties in tetraquarks with heavy quark pairs which may be relevant for newly discovered mesons like the X(3872) resonance. Tetraquark masses can be below the two-meson threshold for sufficiently high quark masses. A simple model calculation shows the b q bbar ubar and b q cbar qbar tetraquarks below the B Bbar and B Dbar thresholds. Some of these states have exotic electric charge and their decays might have striking signatures involving monoenergetic photons and/or pions. |
1306.2668 | Holger Frits Bech Nielsen | Don Bennett and Holger Bech Nielsen | Seeking a Game in which the standard model Group shall Win | already publiched in 2011 in Bled Conference proceedings "What comes
beyond the Stadard Models" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is attempted to construct a group-dependent quantity that could be used to
single out the Standard Model group S(U(2) x U(3)) as being the "winner" by
this quantity being the biggest possible for just the Standard Model group. The
suggested quantity is first of all based on the inverse quadratic Cassimir for
the fundamental or better smallest faithful representation in a notation in
which the adjoint representation quadratic Cassimir is normalized to unity.
Then a further correction is added to help the wanted Standard Model group to
win and the rule comes even to involve the Abelian group U(1) to be multiplied
into the group to get this correction be allowed. The scheme is suggestively
explained to have some physical interpretation(s). By some appropriate
proceedure for extending the group dependent quantity to groups that are not
simple we find a way to make the Standard Model Group the absolute "winner".
Thus we provide an indication for what could be the reason for the Standard
Model Group having been chosen to be the realized one by Nature.
| [
{
"created": "Tue, 11 Jun 2013 22:04:21 GMT",
"version": "v1"
}
] | 2013-06-13 | [
[
"Bennett",
"Don",
""
],
[
"Nielsen",
"Holger Bech",
""
]
] | It is attempted to construct a group-dependent quantity that could be used to single out the Standard Model group S(U(2) x U(3)) as being the "winner" by this quantity being the biggest possible for just the Standard Model group. The suggested quantity is first of all based on the inverse quadratic Cassimir for the fundamental or better smallest faithful representation in a notation in which the adjoint representation quadratic Cassimir is normalized to unity. Then a further correction is added to help the wanted Standard Model group to win and the rule comes even to involve the Abelian group U(1) to be multiplied into the group to get this correction be allowed. The scheme is suggestively explained to have some physical interpretation(s). By some appropriate proceedure for extending the group dependent quantity to groups that are not simple we find a way to make the Standard Model Group the absolute "winner". Thus we provide an indication for what could be the reason for the Standard Model Group having been chosen to be the realized one by Nature. |
hep-ph/0512053 | Maxim Perelstein | C. F. Berger, M. Perelstein, F. Petriello | Top Quark Properties in Little Higgs Models | 3 pages, 4 figures. Contributed to 2005 International Linear Collider
Physics and Detector Workshop and 2nd ILC Accelerator Workshop, Snowmass,
Colorado, 14-27 Aug 2005 | null | null | MADPH-05-1251, SLAC-PUB-11589 | hep-ph | null | We study the shifts in the gauge couplings of the top quark induced in the
Littlest Higgs model with and without T parity. We find that the ILC will be
able to observe the shifts throughout the natural range of model parameters.
| [
{
"created": "Sun, 4 Dec 2005 23:03:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berger",
"C. F.",
""
],
[
"Perelstein",
"M.",
""
],
[
"Petriello",
"F.",
""
]
] | We study the shifts in the gauge couplings of the top quark induced in the Littlest Higgs model with and without T parity. We find that the ILC will be able to observe the shifts throughout the natural range of model parameters. |
hep-ph/9401349 | D. R. T. Jones | I. Jack, D. R. T. Jones and K. L. Roberts | Equivalence of Dimensional Reduction and Dimensional Regularisation | 17 pages, LTH 329. Uses Harvmac | Z.Phys. C63 (1994) 151-160 | 10.1007/BF01577555 | null | hep-ph | null | For some years there has been uncertainty over whether regularisation by
dimensional reduction (DRED) is viable for non-supersymmetric theories. We
resolve this issue by showing that DRED is entirely equivalent to standard
dimensional regularisation (DREG), to all orders in perturbation theory and for
a general renormalisable theory. The two regularisation schemes are related by
an analytic redefinition of the couplings, under which the $\b$-functions
calculated using DRED transform into those computed in DREG. The $S$-matrix
calculated using DRED is numerically equal to the DREG version, ensuring that
both schemes give the same physics.
| [
{
"created": "Fri, 28 Jan 1994 12:00:08 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
],
[
"Roberts",
"K. L.",
""
]
] | For some years there has been uncertainty over whether regularisation by dimensional reduction (DRED) is viable for non-supersymmetric theories. We resolve this issue by showing that DRED is entirely equivalent to standard dimensional regularisation (DREG), to all orders in perturbation theory and for a general renormalisable theory. The two regularisation schemes are related by an analytic redefinition of the couplings, under which the $\b$-functions calculated using DRED transform into those computed in DREG. The $S$-matrix calculated using DRED is numerically equal to the DREG version, ensuring that both schemes give the same physics. |
1811.05686 | Kazem Azizi | T. M. Aliev, K. Azizi, Y. Sarac, H. Sundu | Determination of the quantum numbers of $\Sigma_b(6097)^{\pm}$ via their
strong decays | 19 Pages, 3 Figures and 3 Tables | Phys. Rev. D 99, 094003 (2019) | 10.1103/PhysRevD.99.094003 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The progresses in the experimental sector have been the harbinger of the
observations of many new hadrons. Very recently, LHCb Collaboration announced
the observation of two new $\Sigma_b(6097)^{\pm}$ states in the
$\Lambda^0_b\pi^{\pm}$ invariant mass distribution, which are considered as the
excited states of the ground state $\Sigma^{(*)}_b$ baryon. Though, almost all
of the ground state baryons have been observed, having a limited number of
excited states observed so far makes them intriguing. Understanding the
properties of the excited baryons improve our knowledge on the strong
interaction as well as the nature and internal structures of these baryons. To
specify the quantum numbers of the $\Sigma_b(6097)^{\pm}$ an analysis on their
strong decays to $\Lambda_b^0$ and $\pi^{\pm}$ is performed within the light
cone QCD sum rule formalism. To this end, they are considered as possible $1P$
or $2S$ excitation of either the ground state $\Sigma_b$ baryon with
$J=\frac{1}{2}$ or $\Sigma_b^{*}$ baryon with $J=\frac{3}{2}$. The
corresponding masses are also calculated considering the same scenarios for
their quantum numbers. The results of the analyses indicate that the
$\Sigma_b(6097)^{\pm}$ baryons are excited $1P$ baryons having quantum numbers
$J^P=\frac{3}{2}^-$.
| [
{
"created": "Wed, 14 Nov 2018 08:40:36 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2019 08:44:57 GMT",
"version": "v2"
}
] | 2019-05-15 | [
[
"Aliev",
"T. M.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sarac",
"Y.",
""
],
[
"Sundu",
"H.",
""
]
] | The progresses in the experimental sector have been the harbinger of the observations of many new hadrons. Very recently, LHCb Collaboration announced the observation of two new $\Sigma_b(6097)^{\pm}$ states in the $\Lambda^0_b\pi^{\pm}$ invariant mass distribution, which are considered as the excited states of the ground state $\Sigma^{(*)}_b$ baryon. Though, almost all of the ground state baryons have been observed, having a limited number of excited states observed so far makes them intriguing. Understanding the properties of the excited baryons improve our knowledge on the strong interaction as well as the nature and internal structures of these baryons. To specify the quantum numbers of the $\Sigma_b(6097)^{\pm}$ an analysis on their strong decays to $\Lambda_b^0$ and $\pi^{\pm}$ is performed within the light cone QCD sum rule formalism. To this end, they are considered as possible $1P$ or $2S$ excitation of either the ground state $\Sigma_b$ baryon with $J=\frac{1}{2}$ or $\Sigma_b^{*}$ baryon with $J=\frac{3}{2}$. The corresponding masses are also calculated considering the same scenarios for their quantum numbers. The results of the analyses indicate that the $\Sigma_b(6097)^{\pm}$ baryons are excited $1P$ baryons having quantum numbers $J^P=\frac{3}{2}^-$. |
1209.1690 | Hisakazu Minakata | Hisakazu Minakata | Phenomenology of future neutrino experiments with large Theta(13) | Talk at Neutrino 2012, Kyoto, Japan, June 3-9, 2012. 9 pages, 4
figures (not in a recommended format) | null | 10.1016/j.nuclphysbps.2013.04.008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question "how small is the lepton mixing angle \theta_{13}?" had a
convincing answer in a surprisingly short time, \theta_{13} \simeq 9^{\circ}, a
large value comparable to the Chooz limit. It defines a new epoch in the
program of determining the lepton mixing parameters, opening the door to search
for lepton CP violation of the Kobayashi-Maskawa-type. I discuss influences of
the large value of \theta_{13} to search for CP violation and determination of
the neutrino mass hierarchy, the remaining unknowns in the standard
three-flavor mixing scheme of neutrinos. I emphasize the following two points:
(1) Large \theta_{13} makes determination of the mass hierarchy easier. It
stimulates to invent new ideas and necessitates quantitative reexamination of
practical ways to explore it. (2) However, large \theta_{13} does not quite
make CP measurement easier so that we do need a "guaranteeing machine" to
measure CP phase \delta.
| [
{
"created": "Sat, 8 Sep 2012 06:07:59 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Minakata",
"Hisakazu",
""
]
] | The question "how small is the lepton mixing angle \theta_{13}?" had a convincing answer in a surprisingly short time, \theta_{13} \simeq 9^{\circ}, a large value comparable to the Chooz limit. It defines a new epoch in the program of determining the lepton mixing parameters, opening the door to search for lepton CP violation of the Kobayashi-Maskawa-type. I discuss influences of the large value of \theta_{13} to search for CP violation and determination of the neutrino mass hierarchy, the remaining unknowns in the standard three-flavor mixing scheme of neutrinos. I emphasize the following two points: (1) Large \theta_{13} makes determination of the mass hierarchy easier. It stimulates to invent new ideas and necessitates quantitative reexamination of practical ways to explore it. (2) However, large \theta_{13} does not quite make CP measurement easier so that we do need a "guaranteeing machine" to measure CP phase \delta. |
hep-ph/0107306 | Venya Berezinsky | V. Berezinsky, A.Z. Gazizov, and S.I. Grigorieva | Ultra high energy cosmic rays from extragalactic astrophysical sources:
energy losses and spectra | new results are added. Extended version of the paper published in
Proc.27th ICRC (eds M.Simon, E.Lorenz, M.Pohly) v.5, p.1983 (2001) | null | null | null | hep-ph astro-ph | null | The energy losses and spectra of Ultra High Energy Cosmic Rays (UHECR) are
calculated for protons as primary particles. The attention is given to the
energy losses due to electron-positron production in collisions with the
microwave 2.73 K photons. The energy spectra are calculated for several models,
which differ by production spectra and by source distribution, namely: (i)
Uniform distribution of the sources with steep generation spectra with indices
2.4 - 2.7, with cosmological evolution and without it. In this case it is
possible to fit the shape of the observed spectrum up to 8.10^{19} eV, but the
required CR emissivity is too high and the GZK cutoff is present. (ii) Uniform
distribution of the sources with flat generation spectrum dE/E^2 which is
relevant to GRBs. The calculated spectrum is in disagreement with the observed
one. The agreement at E\lesssim 8.10^{19} eV can be reached using a complex
generation spectrum, but the required CR emissivity is three orders of
magnitude higher than that of GRBs, and the predicted spectrum has the GZK
cutoff. (iii) The case of local enhancement within region of size 10 - 30 Mpc
with overdensity given by factor 3- 30. The overdensity larger than 10 is
needed to eliminate the GZK cutoff.
| [
{
"created": "Mon, 30 Jul 2001 15:35:55 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2002 14:30:45 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Berezinsky",
"V.",
""
],
[
"Gazizov",
"A. Z.",
""
],
[
"Grigorieva",
"S. I.",
""
]
] | The energy losses and spectra of Ultra High Energy Cosmic Rays (UHECR) are calculated for protons as primary particles. The attention is given to the energy losses due to electron-positron production in collisions with the microwave 2.73 K photons. The energy spectra are calculated for several models, which differ by production spectra and by source distribution, namely: (i) Uniform distribution of the sources with steep generation spectra with indices 2.4 - 2.7, with cosmological evolution and without it. In this case it is possible to fit the shape of the observed spectrum up to 8.10^{19} eV, but the required CR emissivity is too high and the GZK cutoff is present. (ii) Uniform distribution of the sources with flat generation spectrum dE/E^2 which is relevant to GRBs. The calculated spectrum is in disagreement with the observed one. The agreement at E\lesssim 8.10^{19} eV can be reached using a complex generation spectrum, but the required CR emissivity is three orders of magnitude higher than that of GRBs, and the predicted spectrum has the GZK cutoff. (iii) The case of local enhancement within region of size 10 - 30 Mpc with overdensity given by factor 3- 30. The overdensity larger than 10 is needed to eliminate the GZK cutoff. |
2109.02897 | Yu-Kuo Hsiao | Xiaotao Huang, Yu-Kuo Hsiao, Jike Wang and Liang Sun | Baryonic $B$ meson decays | 15 pages, 3 tables, 2 figures, published version for the special
issue "Heavy Flavor Physics and CP Violation" of Advances in High Energy
Physics | Adv.High Energy Phys. 2022 (2022) 4343824 | 10.1155/2022/4343824 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We review the two and three-body baryonic $B$ decays with the dibaryon (${\bf
B\bar B'}$) as the final states. Accordingly, we summarize the experimental
data of the branching fractions, angular asymmetries, and $CP$ asymmetries.
Using the $W$-boson annihilation (exchange) mechanism, the branching fractions
of $B\to {\bf B \bf \bar B'}$ are shown to be interpretable. In the approach of
perturbative QCD counting rules, we study the three-body decay channels. In
particular, we review the $CP$ asymmetries of $B\to {\bf B\bar B'}M$, which are
promising to be measured by the LHCb and Belle~II experiments. Finally, we
remark the theoretical challenges in interpreting ${\cal B}(B^-\to p\bar
p\rho^-)$ and ${\cal B}(B^-\to p\bar p\mu^-\bar \nu_\mu)$.
| [
{
"created": "Tue, 7 Sep 2021 06:49:22 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2022 03:10:59 GMT",
"version": "v2"
}
] | 2022-04-06 | [
[
"Huang",
"Xiaotao",
""
],
[
"Hsiao",
"Yu-Kuo",
""
],
[
"Wang",
"Jike",
""
],
[
"Sun",
"Liang",
""
]
] | We review the two and three-body baryonic $B$ decays with the dibaryon (${\bf B\bar B'}$) as the final states. Accordingly, we summarize the experimental data of the branching fractions, angular asymmetries, and $CP$ asymmetries. Using the $W$-boson annihilation (exchange) mechanism, the branching fractions of $B\to {\bf B \bf \bar B'}$ are shown to be interpretable. In the approach of perturbative QCD counting rules, we study the three-body decay channels. In particular, we review the $CP$ asymmetries of $B\to {\bf B\bar B'}M$, which are promising to be measured by the LHCb and Belle~II experiments. Finally, we remark the theoretical challenges in interpreting ${\cal B}(B^-\to p\bar p\rho^-)$ and ${\cal B}(B^-\to p\bar p\mu^-\bar \nu_\mu)$. |
1309.3313 | Aleksandrs Aleksejevs | A. Aleksejevs and S. Barkanova | Hadron Structure in Chiral Perturbation Theory | 9 pages, proceedings for Hadron Structure 13 | null | 10.1016/j.nuclphysbps.2013.10.004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present our predictions for meson form factors for the SU(3) octet and
investigate their impact on the pion electroproduction cross sections. The
electric and magnetic polarizabilities of the SU(3) octet of mesons and baryons
are analyzed in detail. These extensive calculations are made possible by the
recent implementation of semi-automatized calculations in fully-relativistic
chiral perturbation theory, which allows evaluation of polarizabilities from
Compton scattering up to next-to-the-leading order.
| [
{
"created": "Thu, 12 Sep 2013 21:44:10 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Aleksejevs",
"A.",
""
],
[
"Barkanova",
"S.",
""
]
] | We present our predictions for meson form factors for the SU(3) octet and investigate their impact on the pion electroproduction cross sections. The electric and magnetic polarizabilities of the SU(3) octet of mesons and baryons are analyzed in detail. These extensive calculations are made possible by the recent implementation of semi-automatized calculations in fully-relativistic chiral perturbation theory, which allows evaluation of polarizabilities from Compton scattering up to next-to-the-leading order. |
1305.6608 | Anson Hook | Sonia El Hedri and Anson Hook | Minimal Signatures of Naturalness | 14 pages + appendix, journal version | null | 10.1007/JHEP10(2013)105 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the naturalness problem using a model independent bottom up approach
by considering models where only the interaction terms needed to cancel the
Higgs quadratic divergences are present. If quadratic divergences are canceled
by terms linear in the Higgs field, then the collider phenomenology is well
covered by current electroweakino and fourth generation searches. If quadratic
divergences are canceled by terms bilinear in the Higgs field, then the
signatures are highly dependent on the quantum numbers of the new particles.
Precision Higgs measurements can reveal the presence of new particles with
either vevs or Standard Model charges. If the new particles are scalar dark
matter candidates, their direct and indirect detection signatures will be
highly correlated and within the reach of XENON100 and Fermi. Observation at
one of these experiments would imply observation at the other one. Observable
LHC decay channels can also arise if the new particles mix with lighter states.
This decay channel involves only the Higgs boson and not the gauge bosons.
Observation of such decays would give evidence that the new particle is tied to
the naturalness problem.
| [
{
"created": "Tue, 28 May 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2014 07:38:32 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Hedri",
"Sonia El",
""
],
[
"Hook",
"Anson",
""
]
] | We study the naturalness problem using a model independent bottom up approach by considering models where only the interaction terms needed to cancel the Higgs quadratic divergences are present. If quadratic divergences are canceled by terms linear in the Higgs field, then the collider phenomenology is well covered by current electroweakino and fourth generation searches. If quadratic divergences are canceled by terms bilinear in the Higgs field, then the signatures are highly dependent on the quantum numbers of the new particles. Precision Higgs measurements can reveal the presence of new particles with either vevs or Standard Model charges. If the new particles are scalar dark matter candidates, their direct and indirect detection signatures will be highly correlated and within the reach of XENON100 and Fermi. Observation at one of these experiments would imply observation at the other one. Observable LHC decay channels can also arise if the new particles mix with lighter states. This decay channel involves only the Higgs boson and not the gauge bosons. Observation of such decays would give evidence that the new particle is tied to the naturalness problem. |
hep-ph/0310347 | Jerrold Franklin | Jerrold Franklin | Quark Spin Properties at High x | The quark function \phi(123) satisfies the constraint
\phi(123)+\phi(213)=\phi(132)+\phi(231), which is less restrictive than the
symmetry condition \phi(123)=\phi(132) originally stated. This means the
constraint d\downarrow=u\uparrow does not hold at all x. (It still applies
for x--> 1.) The main conclusions that \Delta u/u--> 1 as x--> 1, but
-1/3<(Delta d/d)<0 still hold | Phys.Lett. B587 (2004) 211-215; Erratum-ibid. B599 (2004) 347-347 | 10.1016/j.physletb.2004.03.017 | null | hep-ph hep-ex nucl-ex nucl-th | null | A general three quark bound state satisfying the Pauli principle, and
conserving angular momentum and isospin, is used to investigate the spin
structure of nucleons at high $x$. It is shown if {$F_{1n}/F_{1p}$$\to$1/4},
then both $A_{1p}$ and $A_{1n}$, as well as quark spin distribution $\Delta
u/u$, will approach 1 as $x$$\to$1 in polarized deep inelastic scattering. The
spin distribution $\Delta d/d$ does not approach 1, but is bound by the limits
$-{1/3}\le\Delta d/d\le 0$ for any $x$.
| [
{
"created": "Thu, 30 Oct 2003 15:14:54 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2004 16:07:15 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Aug 2004 07:13:35 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Franklin",
"Jerrold",
""
]
] | A general three quark bound state satisfying the Pauli principle, and conserving angular momentum and isospin, is used to investigate the spin structure of nucleons at high $x$. It is shown if {$F_{1n}/F_{1p}$$\to$1/4}, then both $A_{1p}$ and $A_{1n}$, as well as quark spin distribution $\Delta u/u$, will approach 1 as $x$$\to$1 in polarized deep inelastic scattering. The spin distribution $\Delta d/d$ does not approach 1, but is bound by the limits $-{1/3}\le\Delta d/d\le 0$ for any $x$. |
2104.01152 | Thomas Y. Chen | Thomas C. Paul (CUNY), Sarah T. Reese (CUNY), Luis A. Anchordoqui
(CUNY), Angela V. Olinto (University of Chicago), and Thomas Y. Chen
(Columbia University) | EUSO-SPB2 sensitivity to macroscopic dark matter | To be published in the Proceedings of the 37th International Cosmic
Ray Conference (ICRC 2012), Berlin, 12 -23 July 2021 | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Macroscopic dark matter (or macro) provides a broad class of alternative
candidates to particle dark matter. These candidates would transfer energy
primarily through elastic scattering, and this linear energy deposition would
produce observable signals if a macro were to traverse the atmosphere. We study
the fluorescence emission produced by a macro passing through the atmosphere.
We estimate the sensitivity of EUSO-SPB2 to constrain the two-dimensional
parameter space ($\sigma$ vs. $M$), where $M$ is the macro mass and $\sigma$
its cross sectional area.
| [
{
"created": "Fri, 2 Apr 2021 17:13:30 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2022 23:12:21 GMT",
"version": "v2"
}
] | 2022-11-09 | [
[
"Paul",
"Thomas C.",
"",
"CUNY"
],
[
"Reese",
"Sarah T.",
"",
"CUNY"
],
[
"Anchordoqui",
"Luis A.",
"",
"CUNY"
],
[
"Olinto",
"Angela V.",
"",
"University of Chicago"
],
[
"Chen",
"Thomas Y.",
"",
"Columbia University"... | Macroscopic dark matter (or macro) provides a broad class of alternative candidates to particle dark matter. These candidates would transfer energy primarily through elastic scattering, and this linear energy deposition would produce observable signals if a macro were to traverse the atmosphere. We study the fluorescence emission produced by a macro passing through the atmosphere. We estimate the sensitivity of EUSO-SPB2 to constrain the two-dimensional parameter space ($\sigma$ vs. $M$), where $M$ is the macro mass and $\sigma$ its cross sectional area. |
2107.13930 | Qi-Fang L\"u | Qi-Fang L\"u, Dian-Yong Chen, Yu-Bing Dong, Elena Santopinto | Triply-heavy tetraquarks in an extended relativized quark model | 15 pages, 4 figures. Minor modifications, accepted version | Phys. Rev. D 104, 054026 (2021) | 10.1103/PhysRevD.104.054026 | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we adopt an extended relativized quark model to investigate
the triply-heavy tetrquarks systematically. The mass spectra are obtained by
solving the four-body relativized Hamiltonian including the Coulomb potential,
confining potential, spin-spin interactions, and relativistic corrections. We
find that all of the triply-heavy tetraquarks lie above the corresponding
meson-meson thresholds, and thus no stable one exists. In particular, besides
the spin-spin interactions, the Coulomb and confining potentials also
contribute to the mass splittings in the $cb\bar c \bar q$ and $cb\bar b \bar
q$ systems. Moreover, the whole mass spectra for triply heavy tetraquarks show
quite similar patterns, which preserve the light flavor SU(3) symmetry and
heavy quark symmetry well. Through the fall-apart mechanism, the triply-heavy
tetraquarks may easily decay into the heavy quarkonium plus heavy-light mesons,
which are good candidates for investigation in future experiments.
| [
{
"created": "Thu, 29 Jul 2021 12:26:05 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 2021 08:02:39 GMT",
"version": "v2"
}
] | 2021-09-29 | [
[
"Lü",
"Qi-Fang",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Dong",
"Yu-Bing",
""
],
[
"Santopinto",
"Elena",
""
]
] | In this paper, we adopt an extended relativized quark model to investigate the triply-heavy tetrquarks systematically. The mass spectra are obtained by solving the four-body relativized Hamiltonian including the Coulomb potential, confining potential, spin-spin interactions, and relativistic corrections. We find that all of the triply-heavy tetraquarks lie above the corresponding meson-meson thresholds, and thus no stable one exists. In particular, besides the spin-spin interactions, the Coulomb and confining potentials also contribute to the mass splittings in the $cb\bar c \bar q$ and $cb\bar b \bar q$ systems. Moreover, the whole mass spectra for triply heavy tetraquarks show quite similar patterns, which preserve the light flavor SU(3) symmetry and heavy quark symmetry well. Through the fall-apart mechanism, the triply-heavy tetraquarks may easily decay into the heavy quarkonium plus heavy-light mesons, which are good candidates for investigation in future experiments. |
hep-ph/9507230 | Alejandra Melfo | Gia Dvali, Alejandra Melfo and Goran Senjanovic | Is there a monopole problem? | Latex, 12 pages, revised version as appeared in Physical Review
Letters. Minor corrections, comments and two references added | Phys.Rev.Lett. 75 (1995) 4559-4562 | 10.1103/PhysRevLett.75.4559 | IC/95/145 | hep-ph astro-ph | null | We investigate the high temperature behavior of SU(5) in its minimal version.
We show that there exists a range of parameters of the Higgs potential for
which the symmetry remains broken at high temperature, thus avoiding the phase
transition that gives rise to the overproduction of monopoles . We also show
that in such scenario the thermal production of monopoles can be suppressed in
a wide range of parameters, keeping their number density below the cosmological
limits.
| [
{
"created": "Wed, 5 Jul 1995 13:04:24 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jan 1996 17:52:25 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Dvali",
"Gia",
""
],
[
"Melfo",
"Alejandra",
""
],
[
"Senjanovic",
"Goran",
""
]
] | We investigate the high temperature behavior of SU(5) in its minimal version. We show that there exists a range of parameters of the Higgs potential for which the symmetry remains broken at high temperature, thus avoiding the phase transition that gives rise to the overproduction of monopoles . We also show that in such scenario the thermal production of monopoles can be suppressed in a wide range of parameters, keeping their number density below the cosmological limits. |
hep-ph/9610475 | null | M.J. Musolf | Spin and Weak Interactions in Atoms and Nuclei | 10 pages in revtex, no figures | null | null | INT # DOE/ER/40561-294-INT96-00-151 | hep-ph nucl-th | null | The use of spin observables to study the semi-leptonic and non-leptonic weak
interaction in atoms and nuclei is surveyed. In particular, the use of
semi-leptonic neutral current scattering and atomic parity violation to search
for physics beyond the Standard Model is reviewed. The status of nuclear parity
violation as a probe of the weak N-N interaction is surveyed. Possible atomic
and nuclear signatures of parity conserving, time-reversal violating
interactions are also discussed.
| [
{
"created": "Thu, 24 Oct 1996 18:40:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Musolf",
"M. J.",
""
]
] | The use of spin observables to study the semi-leptonic and non-leptonic weak interaction in atoms and nuclei is surveyed. In particular, the use of semi-leptonic neutral current scattering and atomic parity violation to search for physics beyond the Standard Model is reviewed. The status of nuclear parity violation as a probe of the weak N-N interaction is surveyed. Possible atomic and nuclear signatures of parity conserving, time-reversal violating interactions are also discussed. |
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