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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9306223 | Ernest Ma | Ernest Ma | New Supersymmetric Two-Higgs-Doublet Structure at the Electroweak Energy
Scale | 4 pages, UCRHEP-T112, June 1993, to appear in Proc. of Festschrift in
honor of Kameshwar Wali: New Directions in the Application of Symmetry
Principles to Elementary Particle Theory | null | null | null | hep-ph | null | Contrary to common belief, the requirement that supersymmetry exists and that
there are two Higgs doublets and no singlet at the electroweak energy scale
does not necessarily result in the minimal supersymmetric standard model
(MSSM). An interesting alternative is presented.
| [
{
"created": "Thu, 3 Jun 1993 22:35:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ma",
"Ernest",
""
]
] | Contrary to common belief, the requirement that supersymmetry exists and that there are two Higgs doublets and no singlet at the electroweak energy scale does not necessarily result in the minimal supersymmetric standard model (MSSM). An interesting alternative is presented. |
hep-ph/0509083 | Yue-Liang Wu | Yong-Liang Ma and Yue-Liang Wu (ITP-CAS) | Anomaly and Anomaly-Free Treatment of QFTs Based on Symmetry-preserving
Loop Regularization | 74 pages, Revtex, the ambiguities of anomaly caused by the trace of
gamma matrices with gamma_5 and by the regularization schemes are further
clarified. Minor corrections made without changing the conclusions | Int.J.Mod.Phys. A21 (2006) 6383-6456 | 10.1142/S0217751X0603309X | null | hep-ph | null | The triangle anomaly in massless and massive QED is investigated by adopting
the symmetry-preserving loop regularization method proposed recently in
\cite{LR}. The method is realized in the initial dimension of theory without
modifying the original lagrangian, it preserves symmetries under non-Abelian
gauge and Poincare transformations in spite of the existence of two intrinsic
mass scales $M_c$ and $\mu_s$ which actually play the roles of UV- and IR-cut
off respectively. The axialvector-vector-vector (AVV) triangle diagrams in
massless and massive QED are evaluated explicitly by using the loop
regularization. It is shown that when the momentum $k$ of external state is
soft with $k^2 \ll \mu_s^2, m^2 $ ($m$ is the mass of loop fermions) and $ M_c
\to \infty$, both massless and massive QED become anomaly free. The triangle
anomaly is found to appear as quantum corrections in the case that $ m^2,
\mu_s^2 \ll k^2 $ and $M_c \to \infty$. Especially, it is justified that in the
massless QED with $\mu_s =0$ and $M_c\to \infty$, the triangle anomaly
naturally exists as quantum effects in the axial-vector current when the
ambiguity caused by the trace of gamma matrices with $\gamma_5$ is eliminated
by simply using the definition of $\gamma_5$. It is explicitly demonstrated how
the Ward identity anomaly of currents depends on the treatment for the trace of
gamma matrices, which enables us to make a clarification whether the ambiguity
of triangle anomaly is caused by the regularization scheme in the perturbation
calculations or by the trace of gamma matrices with $\gamma_5$.
| [
{
"created": "Fri, 9 Sep 2005 07:51:59 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2006 04:49:56 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Ma",
"Yong-Liang",
"",
"ITP-CAS"
],
[
"Wu",
"Yue-Liang",
"",
"ITP-CAS"
]
] | The triangle anomaly in massless and massive QED is investigated by adopting the symmetry-preserving loop regularization method proposed recently in \cite{LR}. The method is realized in the initial dimension of theory without modifying the original lagrangian, it preserves symmetries under non-Abelian gauge and Poincare transformations in spite of the existence of two intrinsic mass scales $M_c$ and $\mu_s$ which actually play the roles of UV- and IR-cut off respectively. The axialvector-vector-vector (AVV) triangle diagrams in massless and massive QED are evaluated explicitly by using the loop regularization. It is shown that when the momentum $k$ of external state is soft with $k^2 \ll \mu_s^2, m^2 $ ($m$ is the mass of loop fermions) and $ M_c \to \infty$, both massless and massive QED become anomaly free. The triangle anomaly is found to appear as quantum corrections in the case that $ m^2, \mu_s^2 \ll k^2 $ and $M_c \to \infty$. Especially, it is justified that in the massless QED with $\mu_s =0$ and $M_c\to \infty$, the triangle anomaly naturally exists as quantum effects in the axial-vector current when the ambiguity caused by the trace of gamma matrices with $\gamma_5$ is eliminated by simply using the definition of $\gamma_5$. It is explicitly demonstrated how the Ward identity anomaly of currents depends on the treatment for the trace of gamma matrices, which enables us to make a clarification whether the ambiguity of triangle anomaly is caused by the regularization scheme in the perturbation calculations or by the trace of gamma matrices with $\gamma_5$. |
hep-ph/9906457 | Leonard S. Kisslinger | L.S. Kisslinger, M. Aw, A. Harey and O. Linsuain (Carnegie Mellon
University) | Quark propagator, instantons and gluon propagator | Latex file, no figures | Phys.Rev. C60 (1999) 065204 | 10.1103/PhysRevC.60.065204 | null | hep-ph | null | The Schwinger-Dyson formalism is used to check the consistency of instanton
model solutions for the quark propagator with recent models of confining gluon
propagators. We find that the models are not consistent. A major discrepancy is
the absence of a vector condensate in the instanton model that is present in
the solutions with nonperturbative confining gluons.
| [
{
"created": "Tue, 22 Jun 1999 17:40:46 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kisslinger",
"L. S.",
"",
"Carnegie Mellon\n University"
],
[
"Aw",
"M.",
"",
"Carnegie Mellon\n University"
],
[
"Harey",
"A.",
"",
"Carnegie Mellon\n University"
],
[
"Linsuain",
"O.",
"",
"Carnegie Mellon\n University"
]
] | The Schwinger-Dyson formalism is used to check the consistency of instanton model solutions for the quark propagator with recent models of confining gluon propagators. We find that the models are not consistent. A major discrepancy is the absence of a vector condensate in the instanton model that is present in the solutions with nonperturbative confining gluons. |
1808.02037 | Yongcheng Wu | Ning Chen, Tao Han, Shufang Su, Wei Su, Yongcheng Wu | Type-II 2HDM under the Precision Measurements at the $Z$-pole and a
Higgs Factory | 32 pages, 13 figures; v2: refs added, matches published version | null | 10.1007/JHEP03(2019)023 | PITT-PACC-1808 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Future precision measurements of the Standard Model (SM) parameters at the
proposed $Z$-factories and Higgs factories may have significant impacts on new
physics beyond the Standard Model in the electroweak sector. We illustrate this
by focusing on the Type-II two Higgs doublet model (Type-II 2HDM). The
contributions from the heavy Higgs bosons at the tree-level and at the one-loop
level are included in a full model parameter space. We perform a multiple
variable global fit and study the extent to which the parameters of
non-alignment and non-degenerate masses can be probed by the precision
measurements. We find that the allowed parameter ranges are tightly constrained
by the future Higgs precision measurements, especially for small and large
values of $\tan\beta$. Indirect limits on the masses of heavy Higgs can be
obtained, which can be complementary to the direct searches of the heavy Higgs
bosons at hadron colliders. We also find that the expected accuracies at the
$Z$-pole and at a Higgs factory are quite complementary in constraining mass
splittings of heavy Higgs bosons. The typical results are $|\cos(\beta-\alpha)|
< 0.008, |\Delta m_\Phi | < 200\ {\rm GeV}$, and $\tan\beta \sim 0.2 - 5$. The
reaches from CEPC, FCC-ee and ILC are also compared, for both Higgs and
$Z$-pole precision measurements.
| [
{
"created": "Mon, 6 Aug 2018 18:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2019 13:50:00 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Chen",
"Ning",
""
],
[
"Han",
"Tao",
""
],
[
"Su",
"Shufang",
""
],
[
"Su",
"Wei",
""
],
[
"Wu",
"Yongcheng",
""
]
] | Future precision measurements of the Standard Model (SM) parameters at the proposed $Z$-factories and Higgs factories may have significant impacts on new physics beyond the Standard Model in the electroweak sector. We illustrate this by focusing on the Type-II two Higgs doublet model (Type-II 2HDM). The contributions from the heavy Higgs bosons at the tree-level and at the one-loop level are included in a full model parameter space. We perform a multiple variable global fit and study the extent to which the parameters of non-alignment and non-degenerate masses can be probed by the precision measurements. We find that the allowed parameter ranges are tightly constrained by the future Higgs precision measurements, especially for small and large values of $\tan\beta$. Indirect limits on the masses of heavy Higgs can be obtained, which can be complementary to the direct searches of the heavy Higgs bosons at hadron colliders. We also find that the expected accuracies at the $Z$-pole and at a Higgs factory are quite complementary in constraining mass splittings of heavy Higgs bosons. The typical results are $|\cos(\beta-\alpha)| < 0.008, |\Delta m_\Phi | < 200\ {\rm GeV}$, and $\tan\beta \sim 0.2 - 5$. The reaches from CEPC, FCC-ee and ILC are also compared, for both Higgs and $Z$-pole precision measurements. |
2307.04861 | Adrian Thompson | James B. Dent, Bhaskar Dutta, Adrian Thompson | Bragg-Primakoff Axion Photoconversion in Crystal Detectors | 15 pages, 9 figures (including appendix); updated references | null | null | MI-HET-804 | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | Axions and axion-like pseudoscalar particles with dimension-5 couplings to
photons exhibit coherent Primakoff scattering with ordered crystals at keV
energy scales, making for a natural detection technique in searches for solar
axions. We find that there are large suppressive corrections, potentially
greater than a factor of $\mathcal{O}(10^3)$, to the coherent enhancement when
taking into account absorption of the final state photon. This effect has
already been accounted for in light-shining-through-wall experiments through
the language of Darwin classical diffraction, but is missing from the
literature in the context of solar axion searches that use a matrix element
approach. We extend the treatment of the event rate with a heuristic
description of absorption effects to bridge the gap between these two
languages. Furthermore, we explore the Borrmann effect of anomalous absorption
in lifting some of the event rate suppression by increasing the coherence
length of the conversion. We study this phenomenon in Ge, NaI, and CsI crystal
experiments and its impact on the the projected sensitivities of SuperCDMS,
LEGEND, and SABRE to the solar axion parameter space. Lastly, we comment on the
reach of multi-tonne scale crystal detectors and strategies to maximize the
discovery potential of experimental efforts in this vein.
| [
{
"created": "Mon, 10 Jul 2023 19:17:26 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2023 16:28:49 GMT",
"version": "v2"
}
] | 2023-07-13 | [
[
"Dent",
"James B.",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Thompson",
"Adrian",
""
]
] | Axions and axion-like pseudoscalar particles with dimension-5 couplings to photons exhibit coherent Primakoff scattering with ordered crystals at keV energy scales, making for a natural detection technique in searches for solar axions. We find that there are large suppressive corrections, potentially greater than a factor of $\mathcal{O}(10^3)$, to the coherent enhancement when taking into account absorption of the final state photon. This effect has already been accounted for in light-shining-through-wall experiments through the language of Darwin classical diffraction, but is missing from the literature in the context of solar axion searches that use a matrix element approach. We extend the treatment of the event rate with a heuristic description of absorption effects to bridge the gap between these two languages. Furthermore, we explore the Borrmann effect of anomalous absorption in lifting some of the event rate suppression by increasing the coherence length of the conversion. We study this phenomenon in Ge, NaI, and CsI crystal experiments and its impact on the the projected sensitivities of SuperCDMS, LEGEND, and SABRE to the solar axion parameter space. Lastly, we comment on the reach of multi-tonne scale crystal detectors and strategies to maximize the discovery potential of experimental efforts in this vein. |
1105.1379 | Shufang Su | Vikram Rentala (Univ. of Arizona, UC Irvine), William Shepherd (UC
Irvine), Shufang Su (Univ. of Arizona, UC Irvine) | A Simplified Model Approach to Same-sign Dilepton Resonances | 25 pages, 7 figures | Phys.Rev.D84:035004,2011 | 10.1103/PhysRevD.84.035004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss same-sign dilepton resonances in the simplified model approach.
The relevant $SU(3}_Q^J$ quantum numbers are $1_2^{0,1,2}$. For simplicity, we
only consider a spin 0 scalar, which is typically referred to as a doubly
charged Higgs in the literature. We consider the three simplest cases where the
doubly charged Higgs resides in a singlet, doublet or triplet $SU(2)_L$
representation. We discuss production and decay of such a doubly charged Higgs,
summarize the current direct search limits, and obtain mass limits in the cases
of singlet and doublet for the first time. We also present a complete set of
updated indirect search limits. We study the discovery potential at the Large
Hadron Collider (LHC) with center of mass energies 7 and 14 TeV for the
dominant Drell-Yan pair production with $H^{\pm\pm}$ decay in the $ee$ and
$\mu\mu$ channels. We find that at 7 TeV, the LHC with 10 $fb^{-1}$ luminosity
can probe mass of the doubly charged Higgs up to 380 GeV assuming 100% decay to
leptons. At 14 TeV, the LHC with 100 $fb^{-1}$ luminosity can reach a mass of
up to 800 GeV.
| [
{
"created": "Fri, 6 May 2011 20:02:06 GMT",
"version": "v1"
}
] | 2011-08-12 | [
[
"Rentala",
"Vikram",
"",
"Univ. of Arizona, UC Irvine"
],
[
"Shepherd",
"William",
"",
"UC\n Irvine"
],
[
"Su",
"Shufang",
"",
"Univ. of Arizona, UC Irvine"
]
] | We discuss same-sign dilepton resonances in the simplified model approach. The relevant $SU(3}_Q^J$ quantum numbers are $1_2^{0,1,2}$. For simplicity, we only consider a spin 0 scalar, which is typically referred to as a doubly charged Higgs in the literature. We consider the three simplest cases where the doubly charged Higgs resides in a singlet, doublet or triplet $SU(2)_L$ representation. We discuss production and decay of such a doubly charged Higgs, summarize the current direct search limits, and obtain mass limits in the cases of singlet and doublet for the first time. We also present a complete set of updated indirect search limits. We study the discovery potential at the Large Hadron Collider (LHC) with center of mass energies 7 and 14 TeV for the dominant Drell-Yan pair production with $H^{\pm\pm}$ decay in the $ee$ and $\mu\mu$ channels. We find that at 7 TeV, the LHC with 10 $fb^{-1}$ luminosity can probe mass of the doubly charged Higgs up to 380 GeV assuming 100% decay to leptons. At 14 TeV, the LHC with 100 $fb^{-1}$ luminosity can reach a mass of up to 800 GeV. |
hep-ph/9803206 | Ernest Ma | Ernest Ma (UC Riverside) | Neutrino Masses and Anomalous Interactions | 7 pages, no figure, latex, sprocl.sty, talk at XVI Autumn School and
Workshop on Fermion Masses, Mixing and CP Violation, Lisbon, Oct 97 | null | null | UCRHEP-T217 (Feb 98) | hep-ph | null | The interplay between neutrino masses and the interactions of neutrinos with
matter is discussed with an eye to extending the latter to include possible new
interactions. This conjecture may resolve the conundrum posed by the present
experimental data on neutrino oscillations which suggest the existence of four
neutrinos, whereas Z decay and Big Bang Nucleosynthesis allow only three. The
case of a possible sterile neutrino is also briefly discussed.
| [
{
"created": "Sat, 28 Feb 1998 20:42:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | The interplay between neutrino masses and the interactions of neutrinos with matter is discussed with an eye to extending the latter to include possible new interactions. This conjecture may resolve the conundrum posed by the present experimental data on neutrino oscillations which suggest the existence of four neutrinos, whereas Z decay and Big Bang Nucleosynthesis allow only three. The case of a possible sterile neutrino is also briefly discussed. |
1710.03658 | Glenn Robbins | G. Robbins, F. Mahmoudi, A. Arbey, M. Boudaud | Dark matter and LHC: Complementarities and limitations | 5 pages, 3 figures. Contribution to the proceedings of the European
Physical Society Conference on High Energy Physics (EPS-HEP 2017) | null | null | CERN-TH-2017-203 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that dark matter density measurements, indirect and direct
detection experiments, importantly complement the LHC in setting strong
constraints on new physics scenarios. Yet, dark matter searches are subject to
limitations which need to be considered for realistic analyses. For
illustration, we explore the parameter space of the phenomenological MSSM and
discuss the interplay of the constraints from dark matter searches and the LHC,
and analyse the impact of the astrophysical uncertainties in some detail.
| [
{
"created": "Tue, 10 Oct 2017 15:32:08 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Robbins",
"G.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Arbey",
"A.",
""
],
[
"Boudaud",
"M.",
""
]
] | It is well known that dark matter density measurements, indirect and direct detection experiments, importantly complement the LHC in setting strong constraints on new physics scenarios. Yet, dark matter searches are subject to limitations which need to be considered for realistic analyses. For illustration, we explore the parameter space of the phenomenological MSSM and discuss the interplay of the constraints from dark matter searches and the LHC, and analyse the impact of the astrophysical uncertainties in some detail. |
1805.09768 | Arlene Cristina Aguilar | A. C. Aguilar and C. T. Figueiredo | Effects of the ghost sector in gluon mass dynamics | 4 pages, 3 figures. Poster presented at the XIV International
Workshop on Hadron Physics, Florianopolis, Brazil, 18-23 March 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the effects of the ghost sector on the dynamical
mass generation for the gauge boson of a pure Yang-Mills theory. The generation
of a dynamical mass for the gluon is realized by the Schwinger mechanism, which
is triggered by the existence of longitudinally coupled massless poles in the
fundamental vertices of the theory. The appearance of such poles occurs by
purely dynamical reasons and is governed by a set of Bethe-Salpeter equations.
In previous studies, only the presence of massless poles in the
background-gauge three-gluon vertex was considered. Here, we include the
possibility for such poles to appear also in the corresponding ghost-gluon
vertex. Then, we solve the resulting Bethe-Salpeter system, which reveals that
the contribution associated with the poles of the ghost-gluon vertex is
suppressed with respect to those originating from the three-gluon vertex.
| [
{
"created": "Thu, 24 May 2018 16:40:54 GMT",
"version": "v1"
}
] | 2018-05-25 | [
[
"Aguilar",
"A. C.",
""
],
[
"Figueiredo",
"C. T.",
""
]
] | In this work, we investigate the effects of the ghost sector on the dynamical mass generation for the gauge boson of a pure Yang-Mills theory. The generation of a dynamical mass for the gluon is realized by the Schwinger mechanism, which is triggered by the existence of longitudinally coupled massless poles in the fundamental vertices of the theory. The appearance of such poles occurs by purely dynamical reasons and is governed by a set of Bethe-Salpeter equations. In previous studies, only the presence of massless poles in the background-gauge three-gluon vertex was considered. Here, we include the possibility for such poles to appear also in the corresponding ghost-gluon vertex. Then, we solve the resulting Bethe-Salpeter system, which reveals that the contribution associated with the poles of the ghost-gluon vertex is suppressed with respect to those originating from the three-gluon vertex. |
2104.03191 | Francesco Giuli Dr. | Francesco Giuli | Impact of A0 data on the Higgs boson production cross section at the LHC | 4 pages, 8 Figures, 1 Table, proceeding of the Moriond QCD 2021
conference | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we present a way to improve the accuracy of theoretical
predictions for Higgs boson production cross sections at the LHC using the
measurements of lepton angular distributions. In this regards, we exploit the
sensitivity of the lepton angular coefficient associated with the longitudinal
Z-boson polarization to the parton density function (PDF) for gluons resolved
from the incoming protons, in order to constrain the Higgs boson cross section
from gluon fusion processes. We find that high-statistics determinations of the
longitudinally polarized angular coefficient at the LHC Run 3 and
high-luminosity HL-LHC improve the PDF systematics of the Higgs boson cross
section predictions by 50% over a broad range of Higgs boson rapidities. This
study has been conducted using the open-source fitting framework xFitter. This
talk refers to the following paper: arXiv:2012.10298[hep-ph]
| [
{
"created": "Wed, 7 Apr 2021 15:31:32 GMT",
"version": "v1"
}
] | 2021-04-08 | [
[
"Giuli",
"Francesco",
""
]
] | In this talk, we present a way to improve the accuracy of theoretical predictions for Higgs boson production cross sections at the LHC using the measurements of lepton angular distributions. In this regards, we exploit the sensitivity of the lepton angular coefficient associated with the longitudinal Z-boson polarization to the parton density function (PDF) for gluons resolved from the incoming protons, in order to constrain the Higgs boson cross section from gluon fusion processes. We find that high-statistics determinations of the longitudinally polarized angular coefficient at the LHC Run 3 and high-luminosity HL-LHC improve the PDF systematics of the Higgs boson cross section predictions by 50% over a broad range of Higgs boson rapidities. This study has been conducted using the open-source fitting framework xFitter. This talk refers to the following paper: arXiv:2012.10298[hep-ph] |
2107.13037 | Francesco Giovanni Celiberto | Francesco Giovanni Celiberto, Dmitry Yu. Ivanov, Mohammed. M. A.
Mohammed, Alessandro Papa | High-energy resummation in inclusive hadroproduction of Higgs plus jet | Submission to SciPost | SciPost Phys. Proc. 8, 039 (2022) | 10.21468/SciPostPhysProc.8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the standard Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach, with
partial inclusion of next-to-leading order effects, we propose the inclusive
hadroproduction of a Higgs boson and of a jet, featuring large transverse
momenta and well separated in rapidity, as a new channel to probe the BFKL
dynamics. Predictions are presented for cross-sections and azimuthal angle
correlations in different kinematics configurations for the final-state
transverse momenta. We find that the large energy scales provided by the
emission of a Higgs boson stabilize the BFKL series.
| [
{
"created": "Tue, 27 Jul 2021 18:38:39 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2022 00:17:47 GMT",
"version": "v2"
}
] | 2022-08-03 | [
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Mohammed",
"Mohammed. M. A.",
""
],
[
"Papa",
"Alessandro",
""
]
] | Using the standard Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach, with partial inclusion of next-to-leading order effects, we propose the inclusive hadroproduction of a Higgs boson and of a jet, featuring large transverse momenta and well separated in rapidity, as a new channel to probe the BFKL dynamics. Predictions are presented for cross-sections and azimuthal angle correlations in different kinematics configurations for the final-state transverse momenta. We find that the large energy scales provided by the emission of a Higgs boson stabilize the BFKL series. |
1502.04005 | Orfeu Bertolami | Orfeu Bertolami, Hodjat Mariji | A Phase-Space Noncommutative Picture of Nuclear Matter | 13 pages, 2 tables, 2 figures | null | 10.1142/S0217751X15501912 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Noncommutative features are introduced into a relativistic quantum field
theory model of nuclear matter, the quantum hadrodynamics-I nuclear model
(QHD-I). It is shown that the nuclear matter equation of state (NMEoS) depends
on the fundamental momentum scale, $\eta$, introduced by the phase-space
noncommutativity (NC). Although it is found that NC geometry does not affect
the nucleon fields up to $O(\eta^2)$, it affects the energy density, the
pressure and other derivable quantities of the NMEoS, such as the nucleon
\textit{effective mass}. Under the conditions of saturation of the symmetric
NM, the estimated value for the noncommutative parameter is $\sqrt{\eta}=0.014
MeV/c$.
| [
{
"created": "Fri, 13 Feb 2015 14:38:25 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Mariji",
"Hodjat",
""
]
] | Noncommutative features are introduced into a relativistic quantum field theory model of nuclear matter, the quantum hadrodynamics-I nuclear model (QHD-I). It is shown that the nuclear matter equation of state (NMEoS) depends on the fundamental momentum scale, $\eta$, introduced by the phase-space noncommutativity (NC). Although it is found that NC geometry does not affect the nucleon fields up to $O(\eta^2)$, it affects the energy density, the pressure and other derivable quantities of the NMEoS, such as the nucleon \textit{effective mass}. Under the conditions of saturation of the symmetric NM, the estimated value for the noncommutative parameter is $\sqrt{\eta}=0.014 MeV/c$. |
1607.03262 | Carlos Roberto Pena Ruano | A. Donini, P. Hern\'andez, C. Pena, F. Romero-L\'opez | Non-leptonic kaon decays at large $N_c$ | Expanded discussion. Conclusions unchanged. Published version | Phys. Rev. D 94, 114511 (2016) | 10.1103/PhysRevD.94.114511 | IFIC/16-39, IFT-UAM/CSIC-16-063, FTUAM-16-26 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scaling with the number of colours, $N_c$, of the weak
amplitudes mediating kaon mixing and decay. We evaluate the amplitudes of the
two relevant current-current operators on the lattice for $N_c=3-7$. We
conclude that the subleading $1/N_c$ corrections in $\hat{B}_K$ are small, but
those in the $K \rightarrow \pi\pi$ amplitudes are large and fully
anti-correlated in the $I=0, 2$ isospin channels. We briefly comment on the
implications for the $\Delta I=1/2$ rule.
| [
{
"created": "Tue, 12 Jul 2016 08:48:14 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jan 2017 11:51:08 GMT",
"version": "v2"
}
] | 2017-01-05 | [
[
"Donini",
"A.",
""
],
[
"Hernández",
"P.",
""
],
[
"Pena",
"C.",
""
],
[
"Romero-López",
"F.",
""
]
] | We study the scaling with the number of colours, $N_c$, of the weak amplitudes mediating kaon mixing and decay. We evaluate the amplitudes of the two relevant current-current operators on the lattice for $N_c=3-7$. We conclude that the subleading $1/N_c$ corrections in $\hat{B}_K$ are small, but those in the $K \rightarrow \pi\pi$ amplitudes are large and fully anti-correlated in the $I=0, 2$ isospin channels. We briefly comment on the implications for the $\Delta I=1/2$ rule. |
2108.02748 | Fabio L. Braghin | Fabio L Braghin | Strangeness content of the pion in the U(3) Nambu-Jona-Lasinio model | 30 pages, 8 figures, new comments, discussions and estimates for the
strangeness content of the pion, including an estimate based on the pi-eta
mixing. Few misprints/mistakes corrected | null | 10.1088/1361-6471/ac4d79 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Nambu-Jona-Lasinio model is considered with flavor-dependent coupling
constants $G_{ij} \left[ ( \bar{\psi} \lambda_i \psi ) ( \bar{\psi} \lambda_j
\psi )+ ( \bar{\psi} i\gamma_5 \lambda_i \psi ) ( \bar{\psi} i
\gamma_5\lambda_j \psi )\right]$ for $i,j=0,1..N_f^2-1$, and $N_f=3$. A self
consistent calculation of quark effective masses and coupling constants is
performed making the strange quark effective mass to vary considerably. Quantum
mechanical mixings between up, down and strange constituent quarks yields a
strangeness content of the light u and d quarks constituent and of the pion.
Different types of estimates for the strangeness contribution for the pion mass
are provided. Mixing type interactions, $G_{i\neq j}$, induce the light mesons
mixings and estimates for the $\pi^0-\eta$ and $\eta-\eta'$ mixings are
provided. The $\eta-\pi^0$ mixing is argued to be an indication of the
strangeness content of the pion.
| [
{
"created": "Thu, 5 Aug 2021 17:29:20 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 2021 17:58:42 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jan 2022 11:43:49 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Mar 2023 18:10:33 GMT",
"version": "v4"
},
{
"crea... | 2023-07-11 | [
[
"Braghin",
"Fabio L",
""
]
] | The Nambu-Jona-Lasinio model is considered with flavor-dependent coupling constants $G_{ij} \left[ ( \bar{\psi} \lambda_i \psi ) ( \bar{\psi} \lambda_j \psi )+ ( \bar{\psi} i\gamma_5 \lambda_i \psi ) ( \bar{\psi} i \gamma_5\lambda_j \psi )\right]$ for $i,j=0,1..N_f^2-1$, and $N_f=3$. A self consistent calculation of quark effective masses and coupling constants is performed making the strange quark effective mass to vary considerably. Quantum mechanical mixings between up, down and strange constituent quarks yields a strangeness content of the light u and d quarks constituent and of the pion. Different types of estimates for the strangeness contribution for the pion mass are provided. Mixing type interactions, $G_{i\neq j}$, induce the light mesons mixings and estimates for the $\pi^0-\eta$ and $\eta-\eta'$ mixings are provided. The $\eta-\pi^0$ mixing is argued to be an indication of the strangeness content of the pion. |
hep-ph/9909523 | Sanghyeon Chang | Sanghyeon Chang and Masahiro Yamaguchi | Fate of Gravitons in Warped Extra Dimension | 9 pages, no figures, a typo in Eq.(15) is fixed | null | null | TU-575 | hep-ph | null | Interaction of bulk gravitons to Standard Model particles is examined in the
scenario of warped extra dimension. It is found that the length of the extra
dimension is of physical importance as it determines the decay widths of
graviton Kaluza-Klein modes. We show that cosmology as well as collider signals
of the Kaluza-Klein modes are very different for different choices of the
length of the fifth dimension.
| [
{
"created": "Tue, 28 Sep 1999 05:23:57 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 1999 11:29:54 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chang",
"Sanghyeon",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | Interaction of bulk gravitons to Standard Model particles is examined in the scenario of warped extra dimension. It is found that the length of the extra dimension is of physical importance as it determines the decay widths of graviton Kaluza-Klein modes. We show that cosmology as well as collider signals of the Kaluza-Klein modes are very different for different choices of the length of the fifth dimension. |
1704.01894 | Damian Ejlli | Damian Ejlli | Milli-charged fermion vacuum polarization in cosmic magnetic fields and
generation of CMB elliptic polarization | 31 pages and 11 figures. Typos corrected, additional references
included. Additional text about nature of cosmic magnetic field added in the
conclusion section. Version to be published in Physical Review D | Phys. Rev. D 96, 023540 (2017) | 10.1103/PhysRevD.96.023540 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contribution of one loop milli-charged fermion vacuum polarization in
cosmic magnetic field to the cosmic microwave background (CMB) polarization is
considered. Exact and perturbative solution of the density matrix equations of
motion in terms of the Stokes parameters are presented. For linearly polarized
CMB at decoupling time, it is shown that propagation of CMB photons in cosmic
magnetic field would generate elliptic polarization (circular and linear) of
the CMB due to milli-charged fermion vacuum polarization. Analytic expressions
for the degree of circular polarization and rotation angle of polarization
plane of the CMB are presented. Depending on the ratio of milli-charged fermion
relative charge to mass, $\epsilon/m_\epsilon$, and CMB observation frequency,
it is shown that the acquired CMB degree of circular polarization could be of
the order of magnitude $P_C(T_0)\sim 10^{-10}- 10^{-6}$ in the best scenario.
The effect studied generates CMB polarization even in the case when the CMB is
initially in thermal equilibrium. Limits on the magnetic field amplitude due to
prior decoupling CMB polarization are presented.
| [
{
"created": "Thu, 6 Apr 2017 15:40:49 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2017 13:17:37 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Ejlli",
"Damian",
""
]
] | The contribution of one loop milli-charged fermion vacuum polarization in cosmic magnetic field to the cosmic microwave background (CMB) polarization is considered. Exact and perturbative solution of the density matrix equations of motion in terms of the Stokes parameters are presented. For linearly polarized CMB at decoupling time, it is shown that propagation of CMB photons in cosmic magnetic field would generate elliptic polarization (circular and linear) of the CMB due to milli-charged fermion vacuum polarization. Analytic expressions for the degree of circular polarization and rotation angle of polarization plane of the CMB are presented. Depending on the ratio of milli-charged fermion relative charge to mass, $\epsilon/m_\epsilon$, and CMB observation frequency, it is shown that the acquired CMB degree of circular polarization could be of the order of magnitude $P_C(T_0)\sim 10^{-10}- 10^{-6}$ in the best scenario. The effect studied generates CMB polarization even in the case when the CMB is initially in thermal equilibrium. Limits on the magnetic field amplitude due to prior decoupling CMB polarization are presented. |
1008.2895 | Alexey Nefediev | Yu.S.Kalashnikova, A.V.Nefediev (ITEP, Moscow) | X(3872) as a 1D2 charmonium state | RevTeX4, 4 pages, two referenced added, a few minor amends in the
text, version to appear as Brief Report in Phys.Rev.D | Phys.Rev.D82:097502,2010 | 10.1103/PhysRevD.82.097502 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 1D2 charmonium assignment for the X(3872) meson is considered, as
prompted by a recent result from the BABAR Collaboration, favouring 2-+ quantum
numbers for the X. It is shown that established properties of the X(3872) are
in a drastic conflict with the 1D2 c-anti-c assignment.
| [
{
"created": "Tue, 17 Aug 2010 13:41:11 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Oct 2010 18:07:28 GMT",
"version": "v2"
}
] | 2010-12-23 | [
[
"Kalashnikova",
"Yu. S.",
"",
"ITEP, Moscow"
],
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
]
] | The 1D2 charmonium assignment for the X(3872) meson is considered, as prompted by a recent result from the BABAR Collaboration, favouring 2-+ quantum numbers for the X. It is shown that established properties of the X(3872) are in a drastic conflict with the 1D2 c-anti-c assignment. |
hep-ph/0008134 | Evgeny Akhmedov | E.Kh. Akhmedov | Floquet theory of neutrino oscillations in the earth | LaTeX, 28 pages, 8 eps figures. Contribution to the special issue of
Yad. Fiz. dedicated to the memory of A.B. Migdal | Phys.Atom.Nucl.64:787-801,2001; Yad.Fiz.64:851-865,2001 | 10.1134/1.1378869 | FISIST/8-2000/CFIF | hep-ph astro-ph hep-th | null | We review the Floquet theory of linear differential equations with periodic
coefficients and discuss its applications to neutrino oscillations in matter of
periodically varying density. In particular, we consider parametric resonance
in neutrino oscillations which can occur in such media, and discuss
implications for oscillations of neutrinos traversing the earth and passing
through the earth's core.
| [
{
"created": "Mon, 14 Aug 2000 16:58:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Akhmedov",
"E. Kh.",
""
]
] | We review the Floquet theory of linear differential equations with periodic coefficients and discuss its applications to neutrino oscillations in matter of periodically varying density. In particular, we consider parametric resonance in neutrino oscillations which can occur in such media, and discuss implications for oscillations of neutrinos traversing the earth and passing through the earth's core. |
1203.2764 | Dmitry Zhuridov Dr. | Dmitry V. Zhuridov | Testing Localization in Neutrino Oscillations | 5 pages, 2 figures; minor changes, prepared for submission to JHEP | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino wave packet localization in short-baseline neutrino oscillation
experiments, such as MiniBooNE, is investigated. It is shown that the
transition from localization to delocalization may be observed for large
neutrino mass splitting of order 1 eV, e.g., in theories with sterile
neutrinos.
| [
{
"created": "Tue, 13 Mar 2012 11:05:40 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2012 15:33:15 GMT",
"version": "v2"
}
] | 2012-03-19 | [
[
"Zhuridov",
"Dmitry V.",
""
]
] | The neutrino wave packet localization in short-baseline neutrino oscillation experiments, such as MiniBooNE, is investigated. It is shown that the transition from localization to delocalization may be observed for large neutrino mass splitting of order 1 eV, e.g., in theories with sterile neutrinos. |
hep-ph/0203261 | John F. Beacom | G. Barenboim, J.F. Beacom, L. Borissov, B. Kayser | CPT Violation and the Nature of Neutrinos | 10 pages, 1 figure | Phys.Lett.B537:227-232,2002 | 10.1016/S0370-2693(02)01947-0 | FERMILAB-Pub-02/014-T, FERMILAB-Pub-02/014-A | hep-ph nucl-th | null | In order to accommodate the neutrino oscillation signals from the solar,
atmospheric, and LSND data, a sterile fourth neutrino is generally invoked,
though the fits to the data are becoming more and more constrained. However, it
has recently been shown that the data can be explained with only three
neutrinos, if one invokes CPT violation to allow different masses and mixing
angles for neutrinos and antineutrinos. We explore the nature of neutrinos in
such CPT-violating scenarios. Majorana neutrino masses are allowed, but in
general, there are no longer Majorana neutrinos in the conventional sense.
However, CPT-violating models still have interesting consequences for
neutrinoless double beta decay. Compared to the usual case, while the larger
mass scale (from LSND) may appear, a greater degree of suppression can also
occur.
| [
{
"created": "Wed, 27 Mar 2002 23:49:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Barenboim",
"G.",
""
],
[
"Beacom",
"J. F.",
""
],
[
"Borissov",
"L.",
""
],
[
"Kayser",
"B.",
""
]
] | In order to accommodate the neutrino oscillation signals from the solar, atmospheric, and LSND data, a sterile fourth neutrino is generally invoked, though the fits to the data are becoming more and more constrained. However, it has recently been shown that the data can be explained with only three neutrinos, if one invokes CPT violation to allow different masses and mixing angles for neutrinos and antineutrinos. We explore the nature of neutrinos in such CPT-violating scenarios. Majorana neutrino masses are allowed, but in general, there are no longer Majorana neutrinos in the conventional sense. However, CPT-violating models still have interesting consequences for neutrinoless double beta decay. Compared to the usual case, while the larger mass scale (from LSND) may appear, a greater degree of suppression can also occur. |
1512.07165 | Ivan Ni\v{s}and\v{z}i\'c | A. E. C\'arcamo Hern\'andez and Ivan Nisandzic | LHC diphoton 750 GeV resonance as an indication of $SU(3)_c\times
SU(3)_L\times U(1)_X$ gauge symmetry | 13 pages, 1 figure. Substantially improved version | null | null | DO-TH 15/19, USM-TH-339 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC collaborations ATLAS and CMS recently reported on the excess of the
events in the diphoton final states at the invariant mass of about $750~
\text{GeV}$. In this article we speculate on the possibility that the excess
arises from the neutral CP-even component $\phi$ of the scalar triplet $ \Phi $
of the $SU(3)_{c}\times SU(3)_{L}\times U(1)_{X}$ $(3\text{-}3\text{-} 1)$
model that has a $U(1)_{X}$ charge equal to $X=-1/3$ and acquires a vacuum
expectation value larger than the electroweak symmetry breaking scale. The
interactions of the scalar field $\phi$ to the photon- and gluon-pairs are
mediated by the virtual vector-like fermions which appear as components of the
anomaly-free chiral fermion representations of the $3\text{ -}3\text{-}1$ gauge
group.
| [
{
"created": "Tue, 22 Dec 2015 17:28:32 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2016 01:12:34 GMT",
"version": "v2"
}
] | 2016-05-23 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Nisandzic",
"Ivan",
""
]
] | The LHC collaborations ATLAS and CMS recently reported on the excess of the events in the diphoton final states at the invariant mass of about $750~ \text{GeV}$. In this article we speculate on the possibility that the excess arises from the neutral CP-even component $\phi$ of the scalar triplet $ \Phi $ of the $SU(3)_{c}\times SU(3)_{L}\times U(1)_{X}$ $(3\text{-}3\text{-} 1)$ model that has a $U(1)_{X}$ charge equal to $X=-1/3$ and acquires a vacuum expectation value larger than the electroweak symmetry breaking scale. The interactions of the scalar field $\phi$ to the photon- and gluon-pairs are mediated by the virtual vector-like fermions which appear as components of the anomaly-free chiral fermion representations of the $3\text{ -}3\text{-}1$ gauge group. |
hep-ph/0011385 | Mar Bastero | M. Bastero-Gil and S. F. King | Leptogenesis in a Realistic Supersymmetric Model of Inflation with a Low
Reheat Temperature | 17 page, latex, 1 eps fig | Phys.Rev. D63 (2001) 123509 | 10.1103/PhysRevD.63.123509 | SNS-PH/00-17 | hep-ph | null | We discuss leptogenesis in a realistic supersymmetric model of inflation with
a low reheat temperature 1-10 GeV. The lepton asymmetry is generated by a
decaying right handed sneutrino, which is produced after inflation during
preheating. The inflationary model is based on a simple variant of the
Next-to-Minimal Supersymmetric Standard model (NMSSM) which solves the \mu
problem, called \phiNMSSM, where the additional singlet \phi plays the role of
the inflaton in hybrid (or inverted hybrid) type models. The model is invariant
under an approximate Peccei-Quinn symmetry which also solves the strong CP
problem, and leads to an invisible axion with interesting cosmological
consequences. We show how the baryon number of the universe and the nature of
cold dark matter are determined by the same parameters controlling the strong
CP problem, the \mu problem and the neutrino masses and mixing angles.
| [
{
"created": "Thu, 30 Nov 2000 09:29:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bastero-Gil",
"M.",
""
],
[
"King",
"S. F.",
""
]
] | We discuss leptogenesis in a realistic supersymmetric model of inflation with a low reheat temperature 1-10 GeV. The lepton asymmetry is generated by a decaying right handed sneutrino, which is produced after inflation during preheating. The inflationary model is based on a simple variant of the Next-to-Minimal Supersymmetric Standard model (NMSSM) which solves the \mu problem, called \phiNMSSM, where the additional singlet \phi plays the role of the inflaton in hybrid (or inverted hybrid) type models. The model is invariant under an approximate Peccei-Quinn symmetry which also solves the strong CP problem, and leads to an invisible axion with interesting cosmological consequences. We show how the baryon number of the universe and the nature of cold dark matter are determined by the same parameters controlling the strong CP problem, the \mu problem and the neutrino masses and mixing angles. |
1707.09690 | Yanrui Liu | Shao-Zhou Jiang, Yan-Rui Liu, Hong-Qian Wang | Chiral Lagrangians with $\Delta(1232)$ to one loop | 23 pages,8 tables. Less terms are found with more constraints.
Version accepted by PRD | Phys. Rev. D 97, 014002 (2018) | 10.1103/PhysRevD.97.014002 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the Lorentz-invariant chiral Lagrangians up to the order
$\mathcal{O}(p^4)$ by including $\Delta(1232)$ as an explicit degree of
freedom. A full one-loop investigation on processes involving $\Delta(1232)$
can be performed with them. For the $\pi\Delta\Delta$ Lagrangian, one obtains
38 independent terms at the order $\mathcal{O}(p^3)$ and 318 independent terms
at the order $\mathcal{O}(p^4)$. For the $\pi N\Delta$ Lagrangian, we get 33
independent terms at the order $\mathcal{O}(p^3)$ and 218 independent terms at
the order $\mathcal{O}(p^4)$. The heavy baryon projection is also briefly
discussed.
| [
{
"created": "Mon, 31 Jul 2017 00:56:06 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2017 20:30:13 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"Jiang",
"Shao-Zhou",
""
],
[
"Liu",
"Yan-Rui",
""
],
[
"Wang",
"Hong-Qian",
""
]
] | We construct the Lorentz-invariant chiral Lagrangians up to the order $\mathcal{O}(p^4)$ by including $\Delta(1232)$ as an explicit degree of freedom. A full one-loop investigation on processes involving $\Delta(1232)$ can be performed with them. For the $\pi\Delta\Delta$ Lagrangian, one obtains 38 independent terms at the order $\mathcal{O}(p^3)$ and 318 independent terms at the order $\mathcal{O}(p^4)$. For the $\pi N\Delta$ Lagrangian, we get 33 independent terms at the order $\mathcal{O}(p^3)$ and 218 independent terms at the order $\mathcal{O}(p^4)$. The heavy baryon projection is also briefly discussed. |
hep-ph/9411209 | Alexei Gladyshev | A.V.Gladyshev, D.I.Kazakov | Renormalization Group Improved Radiative Corrections to the
Supersymmetric Higgs Boson Masses | 10 PAGES, 1 FIGURE ENCLOSED, LATEX | Mod.Phys.Lett. A10 (1995) 3129-3138 | 10.1142/S0217732395003288 | JINR E2-94-400 | hep-ph | null | The one-loop radiative corrections to the Higgs boson potential in the MSSM,
originating from the top quark and squark loops, are summed in the leading log
approximation using the renormalization group. The RG improved effective
potential is minimized and the corrections to the CP-odd and CP-even Higgs
boson masses are calculated. The resulting masses exhibit smoother top mass
dependence than those calculated without RG summation. We have also found that
for preferable values of the top mass the light Higgs mass does not exceed 100
GeV.
| [
{
"created": "Wed, 2 Nov 1994 18:23:10 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Gladyshev",
"A. V.",
""
],
[
"Kazakov",
"D. I.",
""
]
] | The one-loop radiative corrections to the Higgs boson potential in the MSSM, originating from the top quark and squark loops, are summed in the leading log approximation using the renormalization group. The RG improved effective potential is minimized and the corrections to the CP-odd and CP-even Higgs boson masses are calculated. The resulting masses exhibit smoother top mass dependence than those calculated without RG summation. We have also found that for preferable values of the top mass the light Higgs mass does not exceed 100 GeV. |
0901.3766 | Ethan Neil | Thomas Appelquist, George T. Fleming, Ethan T. Neil | Lattice Study of Conformal Behavior in SU(3) Yang-Mills Theories | 37 pages, 7 figures. v2: assorted minor updates and corrections | Phys.Rev.D79:076010,2009 | 10.1103/PhysRevD.79.076010 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using lattice simulations, we study the extent of the conformal window for an
SU(3) gauge theory with N_f Dirac fermions in the fundamental representation.
We extend our recently reported work, describing the general framework and the
lattice simulations in more detail. We find that the theory is conformal in the
infrared for N_f = 12, governed by an infrared fixed point, whereas the N_f = 8
theory exhibits confinement and chiral symmetry breaking. We therefore conclude
that the low end of the conformal window N_f^c lies in the range 8 <= N_f^c <=
12. We discuss open questions and the potential relevance of the present work
to physics beyond the standard model.
| [
{
"created": "Fri, 23 Jan 2009 20:59:34 GMT",
"version": "v1"
},
{
"created": "Fri, 15 May 2009 20:29:03 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Appelquist",
"Thomas",
""
],
[
"Fleming",
"George T.",
""
],
[
"Neil",
"Ethan T.",
""
]
] | Using lattice simulations, we study the extent of the conformal window for an SU(3) gauge theory with N_f Dirac fermions in the fundamental representation. We extend our recently reported work, describing the general framework and the lattice simulations in more detail. We find that the theory is conformal in the infrared for N_f = 12, governed by an infrared fixed point, whereas the N_f = 8 theory exhibits confinement and chiral symmetry breaking. We therefore conclude that the low end of the conformal window N_f^c lies in the range 8 <= N_f^c <= 12. We discuss open questions and the potential relevance of the present work to physics beyond the standard model. |
hep-ph/0607073 | Kenji Fukushima | Kenji Fukushima | A description of the target wave-function encoded in the source terms | 7 pages, 2 figures, typos corrected and references added | null | null | null | hep-ph | null | We argue that the gauge invariant source terms in the formalism of the Color
Glass Condensate (CGC) should properly describe the target wave-function if the
microscopic structure is concerned in the regime where the parton distribution
is not quite dense. The quantum property of color charge density is
incorporated in the quantum weight function defined with the source terms. We
sketch that the logarithmic source terms encompass a meaningful picture of the
microscopic structure of the target wave-function.
| [
{
"created": "Fri, 7 Jul 2006 00:14:49 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2006 20:55:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fukushima",
"Kenji",
""
]
] | We argue that the gauge invariant source terms in the formalism of the Color Glass Condensate (CGC) should properly describe the target wave-function if the microscopic structure is concerned in the regime where the parton distribution is not quite dense. The quantum property of color charge density is incorporated in the quantum weight function defined with the source terms. We sketch that the logarithmic source terms encompass a meaningful picture of the microscopic structure of the target wave-function. |
0903.2415 | Bjoern Duling | Michaela E. Albrecht, Monika Blanke, Andrzej J. Buras, Bjoern Duling,
Katrin Gemmler | Electroweak and Flavour Structure of a Warped Extra Dimension with
Custodial Protection | 74 pages, 2 figures. clarifying comments and references added,
version to be published in JHEP | JHEP 0909:064,2009 | 10.1088/1126-6708/2009/09/064 | TUM-HEP-711/09, MPP-2009-17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the electroweak and flavour structure of a model with a warped
extra dimension and the bulk gauge group SU(3) x SU(2)_L x SU(2)_R x P_LR x
U(1)_X. The presence of SU(2)_R implies an unbroken custodial symmetry in the
Higgs system allowing to eliminate large contributions to the T parameter,
whereas the P_LR symmetry and the enlarged fermion representations provide a
custodial symmetry for flavour diagonal and flavour changing couplings of the
SM Z boson to left-handed down-type quarks. We diagonalise analytically the
mass matrices of charged and neutral gauge bosons including the first KK modes.
We present the mass matrices for quarks including heavy KK modes and discuss
the neutral and charged currents involving light and heavy fields. We give the
corresponding complete set of Feynman rules in the unitary gauge.
| [
{
"created": "Fri, 13 Mar 2009 16:06:29 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2009 12:00:25 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Albrecht",
"Michaela E.",
""
],
[
"Blanke",
"Monika",
""
],
[
"Buras",
"Andrzej J.",
""
],
[
"Duling",
"Bjoern",
""
],
[
"Gemmler",
"Katrin",
""
]
] | We present the electroweak and flavour structure of a model with a warped extra dimension and the bulk gauge group SU(3) x SU(2)_L x SU(2)_R x P_LR x U(1)_X. The presence of SU(2)_R implies an unbroken custodial symmetry in the Higgs system allowing to eliminate large contributions to the T parameter, whereas the P_LR symmetry and the enlarged fermion representations provide a custodial symmetry for flavour diagonal and flavour changing couplings of the SM Z boson to left-handed down-type quarks. We diagonalise analytically the mass matrices of charged and neutral gauge bosons including the first KK modes. We present the mass matrices for quarks including heavy KK modes and discuss the neutral and charged currents involving light and heavy fields. We give the corresponding complete set of Feynman rules in the unitary gauge. |
1207.2193 | Jen-Chieh Peng | Jen-Chieh Peng and Wen-Chen Chang | Nucleon sea and the five-quark components | 8 pages, 4 figures. Plenary talk at the QNP2012 Conference | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the approach of Brodsky {\it et al.} for the intrinsic charm
quark distribution in the nucleons to the light-quark sector involving
intrinsic $\bar u, \bar d, s$ and $\bar s$ sea quarks. We compare the
calculations with the existing $\bar d - \bar u$, $s + \bar s$, and $\bar u +
\bar d - s -\bar s$ data. The good agreement between the theory and the data is
interpreted as evidence for the existence of the intrinsic light-quark sea in
the nucleons. The probabilities for the $|uudu\bar{u}>$, $|uudd\bar{d}>$ and
$|uuds\bar{s}>$ Fock states are also extracted.
| [
{
"created": "Mon, 9 Jul 2012 22:28:25 GMT",
"version": "v1"
}
] | 2012-07-11 | [
[
"Peng",
"Jen-Chieh",
""
],
[
"Chang",
"Wen-Chen",
""
]
] | We generalize the approach of Brodsky {\it et al.} for the intrinsic charm quark distribution in the nucleons to the light-quark sector involving intrinsic $\bar u, \bar d, s$ and $\bar s$ sea quarks. We compare the calculations with the existing $\bar d - \bar u$, $s + \bar s$, and $\bar u + \bar d - s -\bar s$ data. The good agreement between the theory and the data is interpreted as evidence for the existence of the intrinsic light-quark sea in the nucleons. The probabilities for the $|uudu\bar{u}>$, $|uudd\bar{d}>$ and $|uuds\bar{s}>$ Fock states are also extracted. |
1805.01642 | Divya Sachdeva | Mathew Thomas Arun, Debajyoti Choudhury, Divya Sachdeva | Living Orthogonally: Quasi-universal Extra Dimensions | 43 pages, 5 figures, accepted for publication in JHEP | null | 10.1007/JHEP01(2019)230 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The minimal Universal Extra Dimension scenario is highly constrained owing to
opposing constraints from the observed relic density on the one hand, and the
non-observation of new states at the LHC on the other. Simple extensions in
five-dimensions can only postpone the inevitable. Here, we propose a
six-dimensional alternative with the key feature being that the SM quarks and
leptons are localized on orthogonal directions whereas gauge bosons traverse
the entire bulk. Several different realizations of electroweak symmetry
breaking are possible, while maintaining agreement with low energy observables.
This model is not only consistent with all the current constraints opposing the
minimal Universal Extra Dimension scenario but also allows for a multi-TeV dark
matter particle without the need for any fine-tuning. In addition, it promises
a plethora of new signatures at the LHC and other future experiments.
| [
{
"created": "Fri, 4 May 2018 08:06:52 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jan 2019 06:13:38 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Arun",
"Mathew Thomas",
""
],
[
"Choudhury",
"Debajyoti",
""
],
[
"Sachdeva",
"Divya",
""
]
] | The minimal Universal Extra Dimension scenario is highly constrained owing to opposing constraints from the observed relic density on the one hand, and the non-observation of new states at the LHC on the other. Simple extensions in five-dimensions can only postpone the inevitable. Here, we propose a six-dimensional alternative with the key feature being that the SM quarks and leptons are localized on orthogonal directions whereas gauge bosons traverse the entire bulk. Several different realizations of electroweak symmetry breaking are possible, while maintaining agreement with low energy observables. This model is not only consistent with all the current constraints opposing the minimal Universal Extra Dimension scenario but also allows for a multi-TeV dark matter particle without the need for any fine-tuning. In addition, it promises a plethora of new signatures at the LHC and other future experiments. |
hep-ph/9511311 | Fredrick Olness | Ruibin Meng, Fredrick I. Olness, Davison E. Soper | Semi-Inclusive Deeply Inelastic Scattering at Small q_T | RevTeX format, 32 pages, 15 uuencoded figures with epsf.tex | Phys.Rev.D54:1919-1935,1996 | 10.1103/PhysRevD.54.1919 | CTEQ-409 | hep-ph | null | Measurement of the distribution of hadronic energy in the final state in
deeply inelastic electron scattering at HERA can provide a good test of our
understanding of perturbative QCD. For this purpose, we consider the energy
distribution function, which can be computed without needing final state parton
fragmentation functions. We compute this distribution function for finite
transverse momentum q_T at order alpha_s, and use the results to sum the
perturbation series to obtain a result valid for both large and small values of
transverse momentum.
| [
{
"created": "Tue, 14 Nov 1995 04:08:49 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Meng",
"Ruibin",
""
],
[
"Olness",
"Fredrick I.",
""
],
[
"Soper",
"Davison E.",
""
]
] | Measurement of the distribution of hadronic energy in the final state in deeply inelastic electron scattering at HERA can provide a good test of our understanding of perturbative QCD. For this purpose, we consider the energy distribution function, which can be computed without needing final state parton fragmentation functions. We compute this distribution function for finite transverse momentum q_T at order alpha_s, and use the results to sum the perturbation series to obtain a result valid for both large and small values of transverse momentum. |
hep-ph/0408190 | Richard Galik | Richard S. Galik | Quarkonium Production and Decay | Invited talk at the XXIV Physics in Collisions Conference (PIC04),
Boston, USA, June 2004, 14 pages, LaTeX, 11 eps figures. PSN SUNT09. Several
typographical errors and incorrect spellings corrected | null | null | null | hep-ph | null | With new data sets, recently completed analyses and renewed interest, there
has been significant progress in addressing existing questions about quarkonia
production and decay ... but also new questions and new confrontation with
theory. Some highlights include the firm establishment of the eta_c^' and of
the ``missing'' psi^' decays to pseudoscalar-vector final states, improved
information on the nature of the psi(3770), and the observation of a new,
puzzling charmonium-like state at 3872 MeV.
| [
{
"created": "Tue, 17 Aug 2004 18:25:39 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Sep 2004 18:27:47 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Galik",
"Richard S.",
""
]
] | With new data sets, recently completed analyses and renewed interest, there has been significant progress in addressing existing questions about quarkonia production and decay ... but also new questions and new confrontation with theory. Some highlights include the firm establishment of the eta_c^' and of the ``missing'' psi^' decays to pseudoscalar-vector final states, improved information on the nature of the psi(3770), and the observation of a new, puzzling charmonium-like state at 3872 MeV. |
hep-ph/0005186 | James Hetherington | B.C. Allanach, J.P.J. Hetherington, M.A. Parker, B.R. Webber | Naturalness Reach of the Large Hadron Collider in Minimal Supergravity | 16 pages, 7 figures. Version 2: significant numerical changes due to
improved accuracy of fine-tuning calculation. Section added on discussion of
radiative electroweak breaking constraint | JHEP 0008:017,2000 | 10.1088/1126-6708/2000/08/017 | null | hep-ph hep-ex | null | We re-analyse the prospects of discovering supersymmetry at the LHC, in order
to re-express coverage in terms of a fine-tuning parameter and to extend the
analysis to scalar masses (m_0) above 2 TeV.
We use minimal supergravity (mSUGRA) unification assumptions for the SUSY
breaking parameters. The discovery reach at high m_0 is of renewed interest
because this region has recently been found to have a focus point, leading to
relatively low fine-tuning, and because it remains uncertain how much of the
region can be ruled out due to lack of radiative electroweak symmetry breaking.
The best fine tuning reach is found in a mono-leptonic channel, where for
mu>0, A_0=0 and tan beta=10
(within the focus point region), and a top mass of 174 GeV, all points in
mSUGRA with m_0 < 4000 GeV, with a fine tuning measure up to 210 (500) are
covered by the search, where the definition of fine-tuning excludes (includes)
the contribution from the top Yukawa coupling. Even for arbitrarily high m_0,
mSUGRA can be discovered through gaugino events, provided the gaugino mass
parameter M_1/2 < 460 GeV. In this region, the mono-leptonic channel still
provides the best reach.
| [
{
"created": "Thu, 18 May 2000 11:17:23 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jul 2000 13:35:21 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Allanach",
"B. C.",
""
],
[
"Hetherington",
"J. P. J.",
""
],
[
"Parker",
"M. A.",
""
],
[
"Webber",
"B. R.",
""
]
] | We re-analyse the prospects of discovering supersymmetry at the LHC, in order to re-express coverage in terms of a fine-tuning parameter and to extend the analysis to scalar masses (m_0) above 2 TeV. We use minimal supergravity (mSUGRA) unification assumptions for the SUSY breaking parameters. The discovery reach at high m_0 is of renewed interest because this region has recently been found to have a focus point, leading to relatively low fine-tuning, and because it remains uncertain how much of the region can be ruled out due to lack of radiative electroweak symmetry breaking. The best fine tuning reach is found in a mono-leptonic channel, where for mu>0, A_0=0 and tan beta=10 (within the focus point region), and a top mass of 174 GeV, all points in mSUGRA with m_0 < 4000 GeV, with a fine tuning measure up to 210 (500) are covered by the search, where the definition of fine-tuning excludes (includes) the contribution from the top Yukawa coupling. Even for arbitrarily high m_0, mSUGRA can be discovered through gaugino events, provided the gaugino mass parameter M_1/2 < 460 GeV. In this region, the mono-leptonic channel still provides the best reach. |
0706.3079 | Shao-Ming Wang | Wang Shao-Ming, Han Liang, Ma Wen-Gan, Zhang Ren-You, and Jiang Yi | Revisiting the QCD corrections to the R-parity violating processes
$p\bar{p}/pp \to e\mu+X$ | 9 pages, 8 figures | Chin.Phys.Lett.25:58,2008 | 10.1088/0256-307X/25/1/017 | null | hep-ph | null | We present the theoretical predictions up to QCD NLO for the cross section of
high-mass electron-muon pair production at the Tevatron and the LHC,
considering only the dominant contributions from the third-generation
sneutrino. The dependence of the renormalization and factorization scales on
the total cross section, and the effects on the K-factor due to the uncertainty
of parton distribution function(PDF) have been carefully investigated. By
considering soft-gluon resummation effects to all order in $\alpha_s$ of
leading logarithm, we present the transverse momentum distributions of the
final $e\mu$ pair.
| [
{
"created": "Thu, 21 Jun 2007 03:45:46 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2007 09:14:33 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Nov 2007 07:15:41 GMT",
"version": "v3"
}
] | 2011-08-31 | [
[
"Shao-Ming",
"Wang",
""
],
[
"Liang",
"Han",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Yi",
"Jiang",
""
]
] | We present the theoretical predictions up to QCD NLO for the cross section of high-mass electron-muon pair production at the Tevatron and the LHC, considering only the dominant contributions from the third-generation sneutrino. The dependence of the renormalization and factorization scales on the total cross section, and the effects on the K-factor due to the uncertainty of parton distribution function(PDF) have been carefully investigated. By considering soft-gluon resummation effects to all order in $\alpha_s$ of leading logarithm, we present the transverse momentum distributions of the final $e\mu$ pair. |
1609.00609 | Xian-Qiao Yu | Xian-Qiao Yu | Parton distribution of nucleon and nuclear EMC effect in a statistical
model | 7 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the parton distribution of nucleon and nuclear EMC effect in a
statistical model. We find when we choose the parameters appropriately, the
predictions given by pure statistical laws can fit the experimental data well
in most range of $x$, this reveal statistical law play an important role in the
parton distribution of nucleon.
| [
{
"created": "Sat, 16 Jan 2016 04:23:30 GMT",
"version": "v1"
}
] | 2016-09-05 | [
[
"Yu",
"Xian-Qiao",
""
]
] | We study the parton distribution of nucleon and nuclear EMC effect in a statistical model. We find when we choose the parameters appropriately, the predictions given by pure statistical laws can fit the experimental data well in most range of $x$, this reveal statistical law play an important role in the parton distribution of nucleon. |
hep-ph/0304070 | Alejandro Szynkman | L.N. Epele, D. Gomez Dumm, A. Szynkman | Annihilation amplitudes and factorization in B to phi Kstar | 9 pages, 1 table | Eur.Phys.J.C29:207-213,2003 | 10.1140/epjc/s2003-01217-2 | null | hep-ph | null | We study the decay $B^\pm\to \phi K^{\ast\pm}$, followed by the decay of the
outgoing vector mesons into two pseudoscalars. The analysis of angular
distributions of the decay products is shown to provide useful information
about the annihilation contributions and possible tests of factorization.
| [
{
"created": "Mon, 7 Apr 2003 14:58:19 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Epele",
"L. N.",
""
],
[
"Dumm",
"D. Gomez",
""
],
[
"Szynkman",
"A.",
""
]
] | We study the decay $B^\pm\to \phi K^{\ast\pm}$, followed by the decay of the outgoing vector mesons into two pseudoscalars. The analysis of angular distributions of the decay products is shown to provide useful information about the annihilation contributions and possible tests of factorization. |
1807.01571 | Andreas Papaefstathiou | Karl Nordstr\"om and Andreas Papaefstathiou | $VHH$ production at the High-Luminosity LHC | 14 pages, 8 figures, 4 tables | null | null | Nikhef 2018-028 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenology of associated production of a vector boson with a
pair of Higgs bosons ($VHH$) at the High-Luminosity LHC. Despite the low rate
of this channel, the scaling of the cross section suggests a measurement could
be a useful probe of modifications of the trilinear Higgs boson coupling and
anomalous interactions in the gauge-Higgs sector. We focus on both $WHH$ and
$ZHH$ production, using the leptonic ($W \to l \nu$, $Z \to ll$, $Z \to \nu
\nu$) decay modes of the vector bosons and the $HH \to 4b$ di-Higgs decay mode.
We show that top pair backgrounds are problematic for the $W \to l \nu$ and $Z
\to \nu \nu$ channels, leaving $Z \to ll$ as the most promising decay mode.
However, even for this channel, we find limited sensitivity due to a low signal
rate. We discuss some potential avenues for improvement.
| [
{
"created": "Wed, 4 Jul 2018 13:39:01 GMT",
"version": "v1"
}
] | 2018-07-05 | [
[
"Nordström",
"Karl",
""
],
[
"Papaefstathiou",
"Andreas",
""
]
] | We study the phenomenology of associated production of a vector boson with a pair of Higgs bosons ($VHH$) at the High-Luminosity LHC. Despite the low rate of this channel, the scaling of the cross section suggests a measurement could be a useful probe of modifications of the trilinear Higgs boson coupling and anomalous interactions in the gauge-Higgs sector. We focus on both $WHH$ and $ZHH$ production, using the leptonic ($W \to l \nu$, $Z \to ll$, $Z \to \nu \nu$) decay modes of the vector bosons and the $HH \to 4b$ di-Higgs decay mode. We show that top pair backgrounds are problematic for the $W \to l \nu$ and $Z \to \nu \nu$ channels, leaving $Z \to ll$ as the most promising decay mode. However, even for this channel, we find limited sensitivity due to a low signal rate. We discuss some potential avenues for improvement. |
hep-ph/0208123 | Vladimir Anisovich | V.V. Anisovich | Systematics of quark-antiquark states and scalar exotic mesons | 55 pages, LaTeX, 11 figures, epsfig.sty, Corrections are done in line
with published version | Phys.Usp.47:45-67,2004; Usp.Fiz.Nauk 47:49-72,2004 | 10.1070/PU2004v047n01ABEH001333 | null | hep-ph | null | The analysis of the experimental data of Crystal Barrel Collaboration on the
p anti-p annihilation in flight with the production of mesons in the final
state resulted in a discovery of a large number of mesons over the region
1900-2400 MeV, thus allowing us to systematize quark-antiquark states in the
(n,M^2) and (J,M^2) planes, where n and J are radial quantum number and spin of
the meson with the mass M. The data point to meson trajectories in these planes
being approximately linear, with a universal slope. The sector of scalar mesons
is discussed in more detail, where, on the basis of the recent K-matrix
analysis, the nonet classification of quark-antiquark states was performed: in
the region below 2000 MeV, two scalar nonets are fixed, that is, the basic one
and the nonet of the first radial excitation. In the scalar sector, there are
two states with the isospin I=0, which are extra ones with respect to the
quark--antiquark classification, i.e. exotic states: the broad resonance
f0(1200-1600) and the light sigma-meson. The ratios of coupling constants for
hadronic decays to the states pi pi, K anti-K, eta eta, eta eta' point to the
gluonium nature of the broad state f0(1200-1600).
| [
{
"created": "Tue, 13 Aug 2002 10:23:48 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2003 11:40:32 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jan 2004 08:03:16 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Anisovich",
"V. V.",
""
]
] | The analysis of the experimental data of Crystal Barrel Collaboration on the p anti-p annihilation in flight with the production of mesons in the final state resulted in a discovery of a large number of mesons over the region 1900-2400 MeV, thus allowing us to systematize quark-antiquark states in the (n,M^2) and (J,M^2) planes, where n and J are radial quantum number and spin of the meson with the mass M. The data point to meson trajectories in these planes being approximately linear, with a universal slope. The sector of scalar mesons is discussed in more detail, where, on the basis of the recent K-matrix analysis, the nonet classification of quark-antiquark states was performed: in the region below 2000 MeV, two scalar nonets are fixed, that is, the basic one and the nonet of the first radial excitation. In the scalar sector, there are two states with the isospin I=0, which are extra ones with respect to the quark--antiquark classification, i.e. exotic states: the broad resonance f0(1200-1600) and the light sigma-meson. The ratios of coupling constants for hadronic decays to the states pi pi, K anti-K, eta eta, eta eta' point to the gluonium nature of the broad state f0(1200-1600). |
hep-ph/9809442 | Jianwei Qiu | Jianwei Qiu (Iowa State/BNL), James P. Vary (Iowa State) and Xiaofei
Zhang (Iowa State) | J/\psi Suppression in Nucleus-Nucleus Collisions | Revtex 10 pages and 2 postscript figures | Phys.Rev.Lett. 88 (2002) 232301 | 10.1103/PhysRevLett.88.232301 | null | hep-ph nucl-th | null | We propose a model for the production and suppression of J/\psi mesons in
high-energy hadronic collisions. We factorized the process into a production of
the $c\bar{c}$ pairs of relative momentum $k=k_c-k_{\bar{c}}$ convoluted with a
transition probability from the produced $c\bar{c}$ pairs into the observed
J/$\psi$ mesons. As the produced $c\bar{c}$ pairs exit the nuclear matter, the
multiple scattering between the colored $c$ and $\bar{c}$ and the nuclear
medium increases the square of the relative momentum between the $c$ and
$\bar{c}, q^2=-k^2$, such that some of the $c\bar{c}$ pairs gain enough
invariant mass to transmute into open charm states. With only one parameter,
the amount of energy gained by the produced $c\bar{c}$ pair per unit length in
the nuclear medium, our model can fit all observed J/\psi suppression data
including recent NA50 data from Pb-Pb collisions.
| [
{
"created": "Fri, 18 Sep 1998 00:07:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Qiu",
"Jianwei",
"",
"Iowa State/BNL"
],
[
"Vary",
"James P.",
"",
"Iowa State"
],
[
"Zhang",
"Xiaofei",
"",
"Iowa State"
]
] | We propose a model for the production and suppression of J/\psi mesons in high-energy hadronic collisions. We factorized the process into a production of the $c\bar{c}$ pairs of relative momentum $k=k_c-k_{\bar{c}}$ convoluted with a transition probability from the produced $c\bar{c}$ pairs into the observed J/$\psi$ mesons. As the produced $c\bar{c}$ pairs exit the nuclear matter, the multiple scattering between the colored $c$ and $\bar{c}$ and the nuclear medium increases the square of the relative momentum between the $c$ and $\bar{c}, q^2=-k^2$, such that some of the $c\bar{c}$ pairs gain enough invariant mass to transmute into open charm states. With only one parameter, the amount of energy gained by the produced $c\bar{c}$ pair per unit length in the nuclear medium, our model can fit all observed J/\psi suppression data including recent NA50 data from Pb-Pb collisions. |
hep-ph/9205246 | null | Gary R. Goldstein, K. Sliwa, and R.H. Dalitz | On Observing Top Quark Production at the Tevatron | 8 pages, TUFTS-TH-92-G01 (Two minor TeX mistakes corrected) | Phys.Rev.D47:967-972,1993 | 10.1103/PhysRevD.47.967 | null | hep-ph | null | A technique for separating top quark production from Standard Model
background events is introduced. It is applicable to the channel in which one
top quark decays semi-leptonically and its anti-quark decays hadronically into
three jets, or vice versa. The method is shown to discriminate dramatically
between Monte Carlo generated events with and without simulated top quarks of
mass around 120 GeV and above. The simulations were performed with CDF detector
characteristics incorporated, showing that the method is applicable to existing
data.
| [
{
"created": "Sat, 30 May 1992 02:54:00 GMT",
"version": "v1"
},
{
"created": "Sat, 30 May 1992 20:59:00 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Goldstein",
"Gary R.",
""
],
[
"Sliwa",
"K.",
""
],
[
"Dalitz",
"R. H.",
""
]
] | A technique for separating top quark production from Standard Model background events is introduced. It is applicable to the channel in which one top quark decays semi-leptonically and its anti-quark decays hadronically into three jets, or vice versa. The method is shown to discriminate dramatically between Monte Carlo generated events with and without simulated top quarks of mass around 120 GeV and above. The simulations were performed with CDF detector characteristics incorporated, showing that the method is applicable to existing data. |
0905.3489 | Guillermo R\'ios M\'arquez | Guillermo R\'ios, \'Angel G\'omez Nicola, Christoph Hanhart, Jos\'e
Ram\'on Pel\'aez | Chiral Extrapolations of light resonances from dispersion relations and
Chiral Perturbation Theory | 7 pages, 4 figures, to appear in the proceedings of the
"International Workshop on Effective Field Theories: from the Pion to the
Upsilon. EFT09", Valencia, 1 -6 Feb. 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review our recent study of the pion mass dependence of the rho and sigma
resonances generated from one-loop SU(2) Chiral Perturbation Theory (ChPT) with
the Inverse Amplitude Method (IAM) which was modified to properly account for
the Adler zero. The method is based on analyticity, elastic unitarity and ChPT
at low energies, thus yielding the pion mass dependence of the resonance pole
positions from the ChPT series up to a given order. We find that the rho-pi-pi
coupling constant is almost m_pi independent and that our prediction compare
well with some recent lattice results for the rho mass. These findings may be
relevant for studies of the meson spectrum and form factors on the lattice.
| [
{
"created": "Thu, 21 May 2009 13:41:52 GMT",
"version": "v1"
}
] | 2009-05-22 | [
[
"Ríos",
"Guillermo",
""
],
[
"Nicola",
"Ángel Gómez",
""
],
[
"Hanhart",
"Christoph",
""
],
[
"Peláez",
"José Ramón",
""
]
] | We review our recent study of the pion mass dependence of the rho and sigma resonances generated from one-loop SU(2) Chiral Perturbation Theory (ChPT) with the Inverse Amplitude Method (IAM) which was modified to properly account for the Adler zero. The method is based on analyticity, elastic unitarity and ChPT at low energies, thus yielding the pion mass dependence of the resonance pole positions from the ChPT series up to a given order. We find that the rho-pi-pi coupling constant is almost m_pi independent and that our prediction compare well with some recent lattice results for the rho mass. These findings may be relevant for studies of the meson spectrum and form factors on the lattice. |
1902.07185 | Peter Denton | Peter B. Denton and Stephen J. Parke | Simple and Precise Factorization of the Jarlskog Invariant for Neutrino
Oscillations in Matter | 7 pages, 3 figures; new results added, matches published version | Phys. Rev. D 100, 053004 (2019) | 10.1103/PhysRevD.100.053004 | FERMILAB-PUB-19-072-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For neutrino propagation in matter, we show that the Jarlskog invariant,
which controls the size of true CP violation in neutrino oscillation appearance
experiments, factorizes into three pieces: the vacuum Jarlskog invariant times
two simple two-flavor matter resonance factors that control the matter effects
for the solar and atmospheric resonances independently. If the solar effective
matter potential and the atmospheric effective $\Delta m^2$ are chosen
carefully for these two resonance factors, then the fractional corrections to
this factorization are an impressive 0.04\% or smaller. We also show that the
inverse of the square of the Jarlskog in matter ($1/\hat{J}^2$) is a fourth
order polynomial in the matter potential which guarantees that it can be
factored into two quadratics which immediately implies the functional form of
our approximate, factorized expression.
| [
{
"created": "Tue, 19 Feb 2019 18:35:13 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2019 16:18:29 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Sep 2019 21:51:36 GMT",
"version": "v3"
}
] | 2019-09-18 | [
[
"Denton",
"Peter B.",
""
],
[
"Parke",
"Stephen J.",
""
]
] | For neutrino propagation in matter, we show that the Jarlskog invariant, which controls the size of true CP violation in neutrino oscillation appearance experiments, factorizes into three pieces: the vacuum Jarlskog invariant times two simple two-flavor matter resonance factors that control the matter effects for the solar and atmospheric resonances independently. If the solar effective matter potential and the atmospheric effective $\Delta m^2$ are chosen carefully for these two resonance factors, then the fractional corrections to this factorization are an impressive 0.04\% or smaller. We also show that the inverse of the square of the Jarlskog in matter ($1/\hat{J}^2$) is a fourth order polynomial in the matter potential which guarantees that it can be factored into two quadratics which immediately implies the functional form of our approximate, factorized expression. |
hep-ph/0305302 | Witold Skiba | Witold Skiba and John Terning | A Simple Model of two Little Higgses | 14 pages; changed the normalization of f to ease comparison, fixed a
bug in the fitting program which weakened the bound on f, extended discussion
in section 3 | Phys.Rev.D68:075001,2003 | 10.1103/PhysRevD.68.075001 | null | hep-ph | null | We construct a little Higgs model using a simple global symmetry group SU(9)
spontaneously broken to SU(8). The electroweak interactions are extended to
SU(3)xU(1) and embedded in SU(9). At the electroweak scale, our model is a two
Higgs-doublet model. At the TeV scale, there are additional states, which are
responsible for the cancellation of one loop quadratic divergences. We compute
the effects of heavy states on the precision electroweak observables and find
that the lower bounds on the masses of heavy gauge bosons and fermions are
between 1 and 2 TeV.
| [
{
"created": "Tue, 27 May 2003 21:41:02 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jul 2003 17:16:28 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Skiba",
"Witold",
""
],
[
"Terning",
"John",
""
]
] | We construct a little Higgs model using a simple global symmetry group SU(9) spontaneously broken to SU(8). The electroweak interactions are extended to SU(3)xU(1) and embedded in SU(9). At the electroweak scale, our model is a two Higgs-doublet model. At the TeV scale, there are additional states, which are responsible for the cancellation of one loop quadratic divergences. We compute the effects of heavy states on the precision electroweak observables and find that the lower bounds on the masses of heavy gauge bosons and fermions are between 1 and 2 TeV. |
hep-ph/0407120 | Eric S. Swanson | T. Barnes, F.E. Close, J.J. Dudek, S. Godfrey, E.S. Swanson | Options for the SELEX state D$_{s\J}^+(2632)$ | 6 revtex4 pages, 2 eps figures | Phys.Lett.B600:223-230,2004 | 10.1016/j.physletb.2004.08.075 | null | hep-ph hep-ex | null | We consider possible assignments for the D$_{s\J}^+(2632)$, which was
recently reported in D$_s^+\eta$ and D$^0$K$^+$ final states by the SELEX
Collaboration at Fermilab. The most plausible quark model assignment for this
state is the first radial excitation ($2^3\S_1$) of the $c\bar s$
D$_s^*(2112)$, although the predicted mass and strong decay branching fractions
for this assignment are not in agreement with the SELEX data. The reported
dominance of D$_s\eta$ over DK appears especially problematic. An intriguing
similarity to the K$^*(1414)$ is noted. $2^3\S_1$--$^3\D_1$ configuration
mixing is also considered, and we find that this effect is unlikely to resolve
the branching fraction discrepancy. Other interpretations as a $c\bar s$-hybrid
or a two-meson molecule are also considered, but appear unlikely. Thus, if this
state is confirmed, it will require reconsideration of the systematics of
charmed meson spectroscopy and strong decays.
| [
{
"created": "Sun, 11 Jul 2004 19:25:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Barnes",
"T.",
""
],
[
"Close",
"F. E.",
""
],
[
"Dudek",
"J. J.",
""
],
[
"Godfrey",
"S.",
""
],
[
"Swanson",
"E. S.",
""
]
] | We consider possible assignments for the D$_{s\J}^+(2632)$, which was recently reported in D$_s^+\eta$ and D$^0$K$^+$ final states by the SELEX Collaboration at Fermilab. The most plausible quark model assignment for this state is the first radial excitation ($2^3\S_1$) of the $c\bar s$ D$_s^*(2112)$, although the predicted mass and strong decay branching fractions for this assignment are not in agreement with the SELEX data. The reported dominance of D$_s\eta$ over DK appears especially problematic. An intriguing similarity to the K$^*(1414)$ is noted. $2^3\S_1$--$^3\D_1$ configuration mixing is also considered, and we find that this effect is unlikely to resolve the branching fraction discrepancy. Other interpretations as a $c\bar s$-hybrid or a two-meson molecule are also considered, but appear unlikely. Thus, if this state is confirmed, it will require reconsideration of the systematics of charmed meson spectroscopy and strong decays. |
hep-ph/9508395 | Theodore Tomaras | C. Bachas and T. N. Tomaras | Membranes in the two-Higgs standard model | 7 pages, latex, 3 figures available upon request | Phys.Rev.Lett. 76 (1996) 356-359 | 10.1103/PhysRevLett.76.356 | CPTh-S369.0895, Crete-95-16 | hep-ph hep-th | null | We present some non-topological static wall solutions in two-Higgs extensions
of the standard model. They are classically stable in a large region of
parameter space, compatible with perturbative unitarity and with present
phenomenological bounds.
| [
{
"created": "Tue, 29 Aug 1995 18:31:40 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bachas",
"C.",
""
],
[
"Tomaras",
"T. N.",
""
]
] | We present some non-topological static wall solutions in two-Higgs extensions of the standard model. They are classically stable in a large region of parameter space, compatible with perturbative unitarity and with present phenomenological bounds. |
hep-ph/0211455 | Piotr Niezurawski | P. Niezurawski, A. F. Zarnecki, M. Krawczyk | The SM Higgs-boson production in gamma gamma -> h -> bb at the Photon
Collider at TESLA | Presented at the International Workshop on Linear Colliders
LCWS(2002), Jeju, Korea | null | null | null | hep-ph | null | Measuring the Gamma(h -> gamma gamma)Br(h -> bb) decay at the photon collider
at TESLA is studied for a Standard Model Higgs boson of mass m_h = 120 GeV. The
main background due to the process gamma gamma -> QQ(g), where Q = b,c, is
estimated using the NLO QCD program (G. Jikia); the results obtained are
compared with the LO estimate. Using a realistic luminosity spectrum and
performing a detector simulation, we find that Gamma(h -> gamma gamma)Br(h ->
bb) can be measured with an accuracy better than 2% after one year of photon
collider running.
| [
{
"created": "Fri, 29 Nov 2002 10:36:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Niezurawski",
"P.",
""
],
[
"Zarnecki",
"A. F.",
""
],
[
"Krawczyk",
"M.",
""
]
] | Measuring the Gamma(h -> gamma gamma)Br(h -> bb) decay at the photon collider at TESLA is studied for a Standard Model Higgs boson of mass m_h = 120 GeV. The main background due to the process gamma gamma -> QQ(g), where Q = b,c, is estimated using the NLO QCD program (G. Jikia); the results obtained are compared with the LO estimate. Using a realistic luminosity spectrum and performing a detector simulation, we find that Gamma(h -> gamma gamma)Br(h -> bb) can be measured with an accuracy better than 2% after one year of photon collider running. |
2110.12086 | Ismail Zahed | Thors Hans Hansson and Ismail Zahed | QCD Sum Rules at High Temperature | This paper was posted on the SLAC server on June 5, 1990 | null | null | null | hep-ph hep-lat hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | We generalize the sum rule approach to investigate the nonperturbative
structure of QCD at high temperature. Salient features of the QCD phase above
$T_c$ are discussed, and included in the form of power corrections or
condensate insertions, in an operator product expansion of gauge invariant
correlators. It is shown that for a plausible choice of condensates, QCD at
high temperature exhibits color singlet excitations in the vector channels, as
opposed to merely screened quarks and gluons.
| [
{
"created": "Fri, 22 Oct 2021 22:35:53 GMT",
"version": "v1"
}
] | 2021-10-26 | [
[
"Hansson",
"Thors Hans",
""
],
[
"Zahed",
"Ismail",
""
]
] | We generalize the sum rule approach to investigate the nonperturbative structure of QCD at high temperature. Salient features of the QCD phase above $T_c$ are discussed, and included in the form of power corrections or condensate insertions, in an operator product expansion of gauge invariant correlators. It is shown that for a plausible choice of condensates, QCD at high temperature exhibits color singlet excitations in the vector channels, as opposed to merely screened quarks and gluons. |
hep-ph/0701202 | Michael Klasen | G. Bozzi (ITP Karlsruhe), B. Fuks, M. Klasen (LPSC Grenoble) | Threshold Resummation for Slepton-Pair Production at Hadron Colliders | 20 pages, 11 figures. Wording of several paragraphs improved, some
typos corrected, version accepted by Nucl. Phys. B | Nucl.Phys.B777:157-181,2007 | 10.1016/j.nuclphysb.2007.03.052 | KA-TP-02-2007, LPSC 07-002 | hep-ph | null | We present a first and extensive study of threshold resummation effects for
supersymmetric (SUSY) particle production at hadron colliders, focusing on
Drell-Yan like slepton-pair and slepton-sneutrino associated production. After
confirming the known next-to-leading order (NLO) QCD corrections and
generalizing the NLO SUSY-QCD corrections to the case of mixing squarks in the
virtual loop contributions, we employ the usual Mellin N-space resummation
formalism with the minimal prescription for the inverse Mellin-transform and
improve it by resumming 1/N-suppressed and a class of N-independent universal
contributions. Numerically, our results increase the theoretical cross sections
by 5 to 15% with respect to the NLO predictions and stabilize them by reducing
the scale dependence from up to 20% at NLO to less than 10% with threshold
resummation.
| [
{
"created": "Wed, 24 Jan 2007 07:37:52 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2007 11:32:32 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jun 2007 12:25:13 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bozzi",
"G.",
"",
"ITP Karlsruhe"
],
[
"Fuks",
"B.",
"",
"LPSC Grenoble"
],
[
"Klasen",
"M.",
"",
"LPSC Grenoble"
]
] | We present a first and extensive study of threshold resummation effects for supersymmetric (SUSY) particle production at hadron colliders, focusing on Drell-Yan like slepton-pair and slepton-sneutrino associated production. After confirming the known next-to-leading order (NLO) QCD corrections and generalizing the NLO SUSY-QCD corrections to the case of mixing squarks in the virtual loop contributions, we employ the usual Mellin N-space resummation formalism with the minimal prescription for the inverse Mellin-transform and improve it by resumming 1/N-suppressed and a class of N-independent universal contributions. Numerically, our results increase the theoretical cross sections by 5 to 15% with respect to the NLO predictions and stabilize them by reducing the scale dependence from up to 20% at NLO to less than 10% with threshold resummation. |
0905.4416 | Claudio Coriano | Claudio Coriano, Marco Guzzi, Antonio Mariano | Searching for an Axion-like Particle at the Large Hadron Collider | 4 pages 1 Fig. Presented at IFAE 2009, Bari, 15-17 April 2009, Italy | Nuovo Cim.C32N3-4::265-267,2009 | 10.1393/ncc/i2009-10434-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion-like particles are an important part of the spectrum of anomalous gauge
theories involving modified mechanisms of cancellation of the gauge anomalies.
Among these are intersecting brane models, which are characterized by the
presence of one physical axion. We overview a recent study of their
supersymmetric construction and some LHC studies of the productions rates for a
gauged axion.
| [
{
"created": "Wed, 27 May 2009 13:39:40 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Coriano",
"Claudio",
""
],
[
"Guzzi",
"Marco",
""
],
[
"Mariano",
"Antonio",
""
]
] | Axion-like particles are an important part of the spectrum of anomalous gauge theories involving modified mechanisms of cancellation of the gauge anomalies. Among these are intersecting brane models, which are characterized by the presence of one physical axion. We overview a recent study of their supersymmetric construction and some LHC studies of the productions rates for a gauged axion. |
hep-ph/0411193 | Borut Bajc | Borut Bajc and Goran Senjanovic | Radiative seesaw: a case for split supersymmetry | 12 pages, 2 figures, a few references and short comment on gluinos
added | Phys.Lett. B610 (2005) 80-86 | 10.1016/j.physletb.2005.01.074 | null | hep-ph | null | We revive Witten's mechanism for the radiative seesaw induced neutrino masses
in SO(10) grand unified theory. We propose its extension to charged fermion
masses as a possible cure for wrong tree level mass relations. We offer two
simple realizations that can produce a realistic fermionic spectrum. The first
one requires two 10 dimensional Higgses in the Yukawa sector and utilizes
radiative effects for charged fermion masses. The second one trades one 10 for
a 120 dimensional Higgs and leads to the SO(10) theory with less parameters in
the Yukawa sector. The mechanism works only if supersymmetry is broken at the
GUT scale while gauginos and higgsinos remain at TeV. This provides a strong
rationale for the so called split supersymmetry.
| [
{
"created": "Mon, 15 Nov 2004 17:58:45 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 2004 13:14:37 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bajc",
"Borut",
""
],
[
"Senjanovic",
"Goran",
""
]
] | We revive Witten's mechanism for the radiative seesaw induced neutrino masses in SO(10) grand unified theory. We propose its extension to charged fermion masses as a possible cure for wrong tree level mass relations. We offer two simple realizations that can produce a realistic fermionic spectrum. The first one requires two 10 dimensional Higgses in the Yukawa sector and utilizes radiative effects for charged fermion masses. The second one trades one 10 for a 120 dimensional Higgs and leads to the SO(10) theory with less parameters in the Yukawa sector. The mechanism works only if supersymmetry is broken at the GUT scale while gauginos and higgsinos remain at TeV. This provides a strong rationale for the so called split supersymmetry. |
hep-ph/9308274 | Andrey Kataev | D.J.Broadhurst and A.L.Kataev | Connections between Deep-Inelastic and Annihilation Processes at
Next-to-Next-to-Leading Order and Beyond | 11 pages, LATEX, preprint INR-820/93, OUT-4102-45; In memoriam Sergei
Grogorievich Corishny, 1958-1988 | Phys.Lett. B315 (1993) 179-187 | 10.1016/0370-2693(93)90177-J | null | hep-ph | null | We have discovered 7 intimate connections between the published results for
the radiative corrections, $\Ck$, to the Gross--Llewellyn Smith (GLS) sum rule,
in deep-inelastic lepton scattering, and the radiative corrections, $\Cr$, to
the Adler function of the flavour-singlet vector current, in $\ee$
annihilation. These include a surprising relation between the
scheme-independent single-electron-loop contributions to the 4-loop QED
$\beta$\/-function and the zero-fermion-loop abelian terms in the 3-loop GLS
sum rule. The combined effect of all 7 relations is to give the factorization
of the 2-loop $\beta$\/-function in
\[\Ds\equiv\Ck\Cr-1=\frac{\Be}{\Aq}\left\{S_1\Cf\Aq+\left[S_2\Tf\Nf
+\Sa\Ca+\Sf\Cf\right]\Cf\Aq^2\right\}+O(\Aq^4)\,,\] where
$\Aq=\al(\mu^2=Q^2)/4\pi$ is the $\MS$ coupling of an arbitrary colour gauge
theory, and \[S_1=-\Df{21}{2}+12\Ze3\,;\quad
S_2=\Df{326}{3}-\Df{304}{3}\Ze3\,;\quad
\Sa=-\Df{629}{2}+\Df{884}{3}\Ze3\,;\quad \Sf=\Df{397}{6}+136\Ze3-240\Ze5\]
specify the sole content of $\Ck$ that is not already encoded in $\Cr$ and
$\Be=Q^2\rd\Aq/\rd Q^2$ at $O(\Aq^3)$. The same result is obtained by combining
the radiative corrections to Bjorken's polarized sum rule with those for the
Adler function of the non-singlet axial current. We suggest possible origins of
$\beta$ in the `Crewther discrepancy', $\Ds$, and determine $\Ds/(\Be/\Aq)$, to
all orders in $\Nf\Aq$, in the large-$\Nf$ limit, obtaining the {\em entire\/}
series of coefficients of which $S_1$ and $S_2$ are merely the first two
members.
| [
{
"created": "Fri, 13 Aug 1993 16:06:15 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Broadhurst",
"D. J.",
""
],
[
"Kataev",
"A. L.",
""
]
] | We have discovered 7 intimate connections between the published results for the radiative corrections, $\Ck$, to the Gross--Llewellyn Smith (GLS) sum rule, in deep-inelastic lepton scattering, and the radiative corrections, $\Cr$, to the Adler function of the flavour-singlet vector current, in $\ee$ annihilation. These include a surprising relation between the scheme-independent single-electron-loop contributions to the 4-loop QED $\beta$\/-function and the zero-fermion-loop abelian terms in the 3-loop GLS sum rule. The combined effect of all 7 relations is to give the factorization of the 2-loop $\beta$\/-function in \[\Ds\equiv\Ck\Cr-1=\frac{\Be}{\Aq}\left\{S_1\Cf\Aq+\left[S_2\Tf\Nf +\Sa\Ca+\Sf\Cf\right]\Cf\Aq^2\right\}+O(\Aq^4)\,,\] where $\Aq=\al(\mu^2=Q^2)/4\pi$ is the $\MS$ coupling of an arbitrary colour gauge theory, and \[S_1=-\Df{21}{2}+12\Ze3\,;\quad S_2=\Df{326}{3}-\Df{304}{3}\Ze3\,;\quad \Sa=-\Df{629}{2}+\Df{884}{3}\Ze3\,;\quad \Sf=\Df{397}{6}+136\Ze3-240\Ze5\] specify the sole content of $\Ck$ that is not already encoded in $\Cr$ and $\Be=Q^2\rd\Aq/\rd Q^2$ at $O(\Aq^3)$. The same result is obtained by combining the radiative corrections to Bjorken's polarized sum rule with those for the Adler function of the non-singlet axial current. We suggest possible origins of $\beta$ in the `Crewther discrepancy', $\Ds$, and determine $\Ds/(\Be/\Aq)$, to all orders in $\Nf\Aq$, in the large-$\Nf$ limit, obtaining the {\em entire\/} series of coefficients of which $S_1$ and $S_2$ are merely the first two members. |
hep-ph/0404107 | Kenneth Lane | Adam Martin and Kenneth Lane | CP Violation and Flavor Mixing in Technicolor Theories | 44 pages, Latex, with 14 postscript figures. Version that will appear
in Physical Review D. Error in Delta M_B corrected, leading to increased
lower bounds on Z' and coloron masses and modest changes in calculated sin(2
beta). A small error in Re(epsilon'/epsilon) was also corrected | Phys.Rev. D71 (2005) 015011 | 10.1103/PhysRevD.71.015011 | BUHEP-04-03 | hep-ph hep-ex | null | Vacuum alignment in technicolor models provides an attractive origin for the
quarks' CP violation and, possibly, a natural solution for the strong-CP
problem of QCD. We discuss these topics in this paper. Then we apply them to
determine plausible mixing matrices for left and right-handed quarks. These
matrices determine the Cabibbo-Kobayashi-Maskawa matrix as well as new mixing
angles and phases that are observable in extended technicolor (ETC) and
topcolor (TC2) interactions. We determine the contributions of these new
interactions to CP-violating and mixing observables in the K^0, B_d and B_s
systems. Consistency with mixing and CP violation in the K^0 system requires
assuming that ETC interactions are electroweak generation conserving even if
technicolor has a walking gauge coupling. Large ETC gauge boson masses and
small intergenerational mixing then result in negligibly small ETC
contributions to B-meson mixing and CP violation and to Re(epsilon'/epsilon).
We confirm our earlier strong lower bounds on TC2 gauge boson masses from
B_d--B_d-bar mixing. We then pay special attention to the possibility that
current experiments indicate a deviation from standard model expectations of
the values of sin(2 beta) measured in B_d -> J/psi K_S, phi K_S, eta' K_S, and
pi K_S, studying the ability of TC2 to account for these. We also determine the
TC2 contribution to Delta M_{B_s} and to Re(epsilon'/epsilon), and find them to
be appreciable.
| [
{
"created": "Tue, 13 Apr 2004 18:51:54 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Dec 2004 21:39:14 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Martin",
"Adam",
""
],
[
"Lane",
"Kenneth",
""
]
] | Vacuum alignment in technicolor models provides an attractive origin for the quarks' CP violation and, possibly, a natural solution for the strong-CP problem of QCD. We discuss these topics in this paper. Then we apply them to determine plausible mixing matrices for left and right-handed quarks. These matrices determine the Cabibbo-Kobayashi-Maskawa matrix as well as new mixing angles and phases that are observable in extended technicolor (ETC) and topcolor (TC2) interactions. We determine the contributions of these new interactions to CP-violating and mixing observables in the K^0, B_d and B_s systems. Consistency with mixing and CP violation in the K^0 system requires assuming that ETC interactions are electroweak generation conserving even if technicolor has a walking gauge coupling. Large ETC gauge boson masses and small intergenerational mixing then result in negligibly small ETC contributions to B-meson mixing and CP violation and to Re(epsilon'/epsilon). We confirm our earlier strong lower bounds on TC2 gauge boson masses from B_d--B_d-bar mixing. We then pay special attention to the possibility that current experiments indicate a deviation from standard model expectations of the values of sin(2 beta) measured in B_d -> J/psi K_S, phi K_S, eta' K_S, and pi K_S, studying the ability of TC2 to account for these. We also determine the TC2 contribution to Delta M_{B_s} and to Re(epsilon'/epsilon), and find them to be appreciable. |
hep-ph/0510399 | J. A. R. Cembranos | J. A. R. Cembranos, A. Dobado and A. L. Maroto | Branon radiative corrections to collider physics and precision
observables | 23 pages, 4 figures, LaTeX | Phys.Rev.D73:035008,2006 | 10.1103/PhysRevD.73.035008 | UCI-TR-2005-37 | hep-ph | null | In the context of brane-world scenarios, we study the effects produced by the
exchange of virtual massive branons. A one-loop calculation is performed which
generates higher-dimensional operators involving SM fields suppressed by powers
of the brane tension scale. We discuss constraints on this scenario from
colliders such as HERA, LEP and Tevatron and prospects for future detections at
LHC or ILC. The most interesting phenomenology comes from new four-particles
vertices induced by branon radiative corrections, mainly from four fermion
interactions. The presence of flexible branes modifies also the muon anomalous
magnetic moment and the electroweak precision observables.
| [
{
"created": "Sun, 30 Oct 2005 01:24:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cembranos",
"J. A. R.",
""
],
[
"Dobado",
"A.",
""
],
[
"Maroto",
"A. L.",
""
]
] | In the context of brane-world scenarios, we study the effects produced by the exchange of virtual massive branons. A one-loop calculation is performed which generates higher-dimensional operators involving SM fields suppressed by powers of the brane tension scale. We discuss constraints on this scenario from colliders such as HERA, LEP and Tevatron and prospects for future detections at LHC or ILC. The most interesting phenomenology comes from new four-particles vertices induced by branon radiative corrections, mainly from four fermion interactions. The presence of flexible branes modifies also the muon anomalous magnetic moment and the electroweak precision observables. |
1102.5753 | Satoshi Nakamura | Satoshi X. Nakamura (Jefferson Lab) | Effect of three-pion unitarity on resonance poles from heavy meson
decays | 4 pages, 4 figures, Contribution to the proceedings of International
conference on the structure of baryons (BARYONS'10), Osaka, Japan, Dec. 7-11,
2010 | null | 10.1063/1.3647399 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the final state interaction in 3-pion decay of meson resonances at
the Excited Baryon Analysis Center (EBAC) of JLab. We apply the dynamical
coupled-channels formulation which has been extensively used by EBAC to extract
N* information. The formulation satisfies the 3-pion unitarity condition which
has been missed in the existing works with the isobar models. We report the
effect of the 3-pion unitarity on the meson resonance pole positions and Dalitz
plot.
| [
{
"created": "Mon, 28 Feb 2011 19:39:01 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Nakamura",
"Satoshi X.",
"",
"Jefferson Lab"
]
] | We study the final state interaction in 3-pion decay of meson resonances at the Excited Baryon Analysis Center (EBAC) of JLab. We apply the dynamical coupled-channels formulation which has been extensively used by EBAC to extract N* information. The formulation satisfies the 3-pion unitarity condition which has been missed in the existing works with the isobar models. We report the effect of the 3-pion unitarity on the meson resonance pole positions and Dalitz plot. |
hep-ph/9801297 | U. Meissner | V\'eronique Bernard, Harold W. Fearing, Thomas R. Hemmert, Ulf-G.
Mei{\ss}ner | The form factors of the nucleon at small momentum transfer | 21 pp, RevTeX, uses epsf, 4 figs, minor corrections, accepted for
publication in Nucl.Phys.A | Nucl.Phys. A635 (1998) 121-145; Erratum-ibid. A642 (1998) 563-563 | 10.1016/S0375-9474(98)00175-4 | KFA-IKP(TH)-1998-01, LPT-98-01, TRI-PP-97-73 | hep-ph nucl-th | null | We study the low energy expansion of the nucleon's electroweak form factors
in the framework of an effective chiral Lagrangian including pions, nucleons
and the $Delta (1232)$. We work to third order in the so-called small scale
expansion and compare the results with the ones previously obtained in the
chiral expansion. In addition, these calculations serve as a first exploratory
study of renormalization and decoupling within the small scale expansion.
| [
{
"created": "Wed, 14 Jan 1998 12:11:08 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 1998 15:16:40 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bernard",
"Véronique",
""
],
[
"Fearing",
"Harold W.",
""
],
[
"Hemmert",
"Thomas R.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We study the low energy expansion of the nucleon's electroweak form factors in the framework of an effective chiral Lagrangian including pions, nucleons and the $Delta (1232)$. We work to third order in the so-called small scale expansion and compare the results with the ones previously obtained in the chiral expansion. In addition, these calculations serve as a first exploratory study of renormalization and decoupling within the small scale expansion. |
1901.11473 | Alexei Smirnov Yu | A Y Smirnov | The Mikheyev-Smirnov-Wolfenstein (MSW) Effect | Talk given at the International conference on History of the
Neutrino, September 5 - 7, 2018, Paris, France. LaTeX, 17 pages, 7 figures.
Typos corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Developments of main notions and concepts behind the MSW effect (1978 - 1985)
are described. They include (i) neutrino refraction, matter potential, and
evolution equation in matter, (ii) mixing in matter, resonance and level
crossing; (iii) adiabaticity condition and adiabatic propagation in matter with
varying density. They are in the basis of the resonance enhancement of
oscillations in matter with constant (nearly constant) density, and the
adiabatic flavor conversion in matter with slowly changing density. The former
is realized in matter of the Earth and can be used to establish neutrino mass
hierarchy. The latter provides solution to the solar neutrino problem and play
the key role in transformations of the supernova neutrinos.
| [
{
"created": "Thu, 31 Jan 2019 17:00:58 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2019 17:19:13 GMT",
"version": "v2"
}
] | 2019-02-05 | [
[
"Smirnov",
"A Y",
""
]
] | Developments of main notions and concepts behind the MSW effect (1978 - 1985) are described. They include (i) neutrino refraction, matter potential, and evolution equation in matter, (ii) mixing in matter, resonance and level crossing; (iii) adiabaticity condition and adiabatic propagation in matter with varying density. They are in the basis of the resonance enhancement of oscillations in matter with constant (nearly constant) density, and the adiabatic flavor conversion in matter with slowly changing density. The former is realized in matter of the Earth and can be used to establish neutrino mass hierarchy. The latter provides solution to the solar neutrino problem and play the key role in transformations of the supernova neutrinos. |
hep-ph/9912282 | Ignacio Navarro | A. Ibarra and I. Navarro | Impact of radiative corrections on sterile neutrino scenarios | 14 pages, LaTeX, 2 figures. Discussion enlarged, references added and
typos corrected | JHEP 0002:031,2000 | 10.1088/1126-6708/2000/02/031 | IEM-FT-199/99 | hep-ph | null | In sterile neutrino scenarios, radiative corrections induce mass splittings
proportional to the top Yukawa coupling, in contrast to the three active
neutrino case where the induced splittings are proportional to the tau Yukawa
coupling. In view of this, we have analyzed the stability of the four-neutrino
schemes favored by oscillation experiments, consisting in two pairs of nearly
degenerate neutrinos separated by the LSND gap. Requiring compatibility with
the measurements of the abundances of primordial elements produced in Big Bang
Nucleosynthesis, we find that when the heaviest pair corresponds to the solar
neutrinos (mainly an admixture of nu_e - nu_s) the natural mass splitting is
3-5 orders of magnitude larger than the observed one, discrediting the scenario
from a theoretical point of view. On the contrary, the scheme where the
heaviest pair corresponds to the atmospheric neutrinos (mainly an admixture of
nu_mu - nu_tau) is safe from radiative corrections due to the small sterile
component of these mass eigenstates.
| [
{
"created": "Thu, 9 Dec 1999 19:53:27 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Mar 2000 12:58:02 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Ibarra",
"A.",
""
],
[
"Navarro",
"I.",
""
]
] | In sterile neutrino scenarios, radiative corrections induce mass splittings proportional to the top Yukawa coupling, in contrast to the three active neutrino case where the induced splittings are proportional to the tau Yukawa coupling. In view of this, we have analyzed the stability of the four-neutrino schemes favored by oscillation experiments, consisting in two pairs of nearly degenerate neutrinos separated by the LSND gap. Requiring compatibility with the measurements of the abundances of primordial elements produced in Big Bang Nucleosynthesis, we find that when the heaviest pair corresponds to the solar neutrinos (mainly an admixture of nu_e - nu_s) the natural mass splitting is 3-5 orders of magnitude larger than the observed one, discrediting the scenario from a theoretical point of view. On the contrary, the scheme where the heaviest pair corresponds to the atmospheric neutrinos (mainly an admixture of nu_mu - nu_tau) is safe from radiative corrections due to the small sterile component of these mass eigenstates. |
hep-ph/9407328 | null | F. De Campos, M. A. Garcia-Jare\~NO, Anjan S. Joshipura, J. Rosiek, J.
W. F. Valle and D. P. Roy | Limits on Associated Production of Visibly and Invisibly Decaying Higgs
Bosons from Z Decays | FTUV/94-36, IFIC/94-31 TIFR/TH/94--25, 12 pages + 4 figures (included
as ps files at the end) | Phys.Lett.B336:446-456,1994 | 10.1016/0370-2693(94)90557-6 | null | hep-ph | null | Many extensions of the standard electroweak model Higgs sector suggest that
the main Higgs decay channel is "invisible", for example, $h \to J J$ where $J$
denotes the majoron, a weakly interacting pseudoscalar Goldstone boson
associated to the spontaneous violation of lepton number. In many of these
models the Higgs boson may also be produced in association to a massive
pseudoscalar boson (HA), in addition to the standard Bjorken mechanism (HZ). We
describe a general strategy to determine limits from LEP data on the masses and
couplings of such Higgs bosons, using the existing data on acoplanar dijet
events as well as data on four and six $b$ jet event topologies. For the sake
of illustration, we present constraints that can be obtained for the ALEPH
data.
| [
{
"created": "Tue, 19 Jul 1994 14:53:15 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"De Campos",
"F.",
""
],
[
"Garcia-JareÑO",
"M. A.",
""
],
[
"Joshipura",
"Anjan S.",
""
],
[
"Rosiek",
"J.",
""
],
[
"Valle",
"J. W. F.",
""
],
[
"Roy",
"D. P.",
""
]
] | Many extensions of the standard electroweak model Higgs sector suggest that the main Higgs decay channel is "invisible", for example, $h \to J J$ where $J$ denotes the majoron, a weakly interacting pseudoscalar Goldstone boson associated to the spontaneous violation of lepton number. In many of these models the Higgs boson may also be produced in association to a massive pseudoscalar boson (HA), in addition to the standard Bjorken mechanism (HZ). We describe a general strategy to determine limits from LEP data on the masses and couplings of such Higgs bosons, using the existing data on acoplanar dijet events as well as data on four and six $b$ jet event topologies. For the sake of illustration, we present constraints that can be obtained for the ALEPH data. |
hep-ph/9603365 | Gogberashvili Merab | M.Gogberashvili, L.Midodashvili, P.Midodashvili | Temperature Shift of Neutrino Energy in the External Magnetic Field | 8 pages, no macros, no figures, LaTEX | null | null | IPGAS-HE-1-96 | hep-ph hep-th | null | It is evaluated the first order temperature correction to the energy of
massive neutrino in the case of weak magnetic field.
| [
{
"created": "Wed, 20 Mar 1996 20:50:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gogberashvili",
"M.",
""
],
[
"Midodashvili",
"L.",
""
],
[
"Midodashvili",
"P.",
""
]
] | It is evaluated the first order temperature correction to the energy of massive neutrino in the case of weak magnetic field. |
0904.0934 | Jean Alexandre | Jean Alexandre | Inflaton in R-dependent potential | null | null | null | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a non-minimally coupled inflaton, in a higher order curvature
background, leading to a potential which evolves with the curvature scalar of
the Universe, and which describes two regimes. The first one is a de Sitter
phase, where the potential is static, and an exact exponential solution is
found for the inflaton. The second regime, triggered by the inflaton reaching a
threshold, leads to a power-law expansion, during which the potential becomes
flat, quickly enough for the inflaton never to reach the minimum of the initial
symmetry breaking potential. This scenario is an alternative to the inflaton
oscillating about a minimum of the potential, and where preheating is a
consequence of the flattening of the potential during the power-law expanding
phase.
| [
{
"created": "Mon, 6 Apr 2009 14:40:28 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Mar 2010 14:41:34 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Alexandre",
"Jean",
""
]
] | We consider a non-minimally coupled inflaton, in a higher order curvature background, leading to a potential which evolves with the curvature scalar of the Universe, and which describes two regimes. The first one is a de Sitter phase, where the potential is static, and an exact exponential solution is found for the inflaton. The second regime, triggered by the inflaton reaching a threshold, leads to a power-law expansion, during which the potential becomes flat, quickly enough for the inflaton never to reach the minimum of the initial symmetry breaking potential. This scenario is an alternative to the inflaton oscillating about a minimum of the potential, and where preheating is a consequence of the flattening of the potential during the power-law expanding phase. |
1510.03437 | Diego Aristizabal | D. Aristizabal Sierra, J. Herrero-Garcia, D. Restrepo, A. Vicente | Diboson anomaly: heavy Higgs resonance and QCD vector-like exotics | 12 pages, 5 figures. One reference added, figures updated, results
unchanged | Phys. Rev. D 93, 015012 (2016) | 10.1103/PhysRevD.93.015012 | IFIC/15-79 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ATLAS collaboration (and also CMS) has recently reported an excess over
Standard Model expectations for gauge boson pair production in the invariant
mass region $1.8-2.2$ TeV. In the light of these results, we argue that such
signal might be the first manifestation of the production and further decay of
a heavy CP-even Higgs resulting from a type-I Two Higgs Doublet Model. We
demonstrate that in the presence of colored vector-like fermions, its gluon
fusion production cross-section is strongly enhanced, with the enhancement
depending on the color representation of the new fermion states. Our findings
show that barring the color triplet case, any QCD "exotic" representation can
fit the ATLAS result in fairly large portions of the parameter space. We have
found that if the diboson excess is confirmed and this mechanism is indeed
responsible for it, then the LHC Run-2 should find: (i) a CP-odd scalar with
mass below $\sim 2.3$ TeV, (ii) new colored states with masses below $\sim 2$
TeV, (iii) no statistically significant diboson events in the $W^\pm Z$
channel, (iv) events in the triboson channels $W^\pm W^\mp\,Z$ and $ZZZ$ with
invariant mass amounting to the mass of the CP-odd scalar.
| [
{
"created": "Mon, 12 Oct 2015 20:13:03 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Oct 2015 18:54:44 GMT",
"version": "v2"
}
] | 2016-01-27 | [
[
"Sierra",
"D. Aristizabal",
""
],
[
"Herrero-Garcia",
"J.",
""
],
[
"Restrepo",
"D.",
""
],
[
"Vicente",
"A.",
""
]
] | The ATLAS collaboration (and also CMS) has recently reported an excess over Standard Model expectations for gauge boson pair production in the invariant mass region $1.8-2.2$ TeV. In the light of these results, we argue that such signal might be the first manifestation of the production and further decay of a heavy CP-even Higgs resulting from a type-I Two Higgs Doublet Model. We demonstrate that in the presence of colored vector-like fermions, its gluon fusion production cross-section is strongly enhanced, with the enhancement depending on the color representation of the new fermion states. Our findings show that barring the color triplet case, any QCD "exotic" representation can fit the ATLAS result in fairly large portions of the parameter space. We have found that if the diboson excess is confirmed and this mechanism is indeed responsible for it, then the LHC Run-2 should find: (i) a CP-odd scalar with mass below $\sim 2.3$ TeV, (ii) new colored states with masses below $\sim 2$ TeV, (iii) no statistically significant diboson events in the $W^\pm Z$ channel, (iv) events in the triboson channels $W^\pm W^\mp\,Z$ and $ZZZ$ with invariant mass amounting to the mass of the CP-odd scalar. |
1301.1554 | Adam Smetana | Adam Smetana | Top-quark and neutrino composite Higgs bosons | 12 pages, 4 figures, this third version is the one having been
published in EPJC | The European Physical Journal C, 73:2513, August 2013 | 10.1140/epjc/s10052-013-2513-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of top-quark condensation models, the top-quark alone is too
light to saturate the correct value of the electroweak scale by its condensate.
Within the seesaw scenario the neutrinos can have their Dirac masses large
enough so that their condensates can provide significant contribution to the
value of the electroweak scale. We address the question of a phenomenological
feasibility of the top-quark and neutrino condensation conspiracy against the
electroweak symmetry. Mandatory is to reproduce the masses of electroweak gauge
bosons, the top-quark mass and the recently observed scalar mass of
$125\,\mathrm{GeV}$ and to satisfy the upper limits on absolute value of active
neutrino masses. To accomplish that we design a reasonably simplified effective
model with two composite Higgs doublets. Additionally, we work with a general
number $N$ of right-handed neutrino flavor triplets participating on the seesaw
mechanism. There are no experimental constraints limiting this number. The
upper limit is set by the model itself. Provided that the condensation scale is
of order $10^{17-18}\,\mathrm{GeV}$ and the number of right-handed neutrinos is
${\cal O}(100-1000)$, the model predicts masses of additional Higgs bosons
below $250\,\mathrm{GeV}$ and a suppression of the top-quark Yukawa coupling to
the $125\,\mathrm{GeV}$ particle at the $\sim60\,%$ level of the Standard model
value.
| [
{
"created": "Tue, 8 Jan 2013 14:51:22 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2013 16:30:38 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Sep 2013 08:12:50 GMT",
"version": "v3"
}
] | 2013-09-20 | [
[
"Smetana",
"Adam",
""
]
] | In the context of top-quark condensation models, the top-quark alone is too light to saturate the correct value of the electroweak scale by its condensate. Within the seesaw scenario the neutrinos can have their Dirac masses large enough so that their condensates can provide significant contribution to the value of the electroweak scale. We address the question of a phenomenological feasibility of the top-quark and neutrino condensation conspiracy against the electroweak symmetry. Mandatory is to reproduce the masses of electroweak gauge bosons, the top-quark mass and the recently observed scalar mass of $125\,\mathrm{GeV}$ and to satisfy the upper limits on absolute value of active neutrino masses. To accomplish that we design a reasonably simplified effective model with two composite Higgs doublets. Additionally, we work with a general number $N$ of right-handed neutrino flavor triplets participating on the seesaw mechanism. There are no experimental constraints limiting this number. The upper limit is set by the model itself. Provided that the condensation scale is of order $10^{17-18}\,\mathrm{GeV}$ and the number of right-handed neutrinos is ${\cal O}(100-1000)$, the model predicts masses of additional Higgs bosons below $250\,\mathrm{GeV}$ and a suppression of the top-quark Yukawa coupling to the $125\,\mathrm{GeV}$ particle at the $\sim60\,%$ level of the Standard model value. |
2112.02769 | Yaroslav Balytskyi | Yaroslav Balytskyi | Leptophobic dark photon interpretation of the
$\eta^{\left(\prime\right)}\rightarrow\pi^0\left(\eta\right)\gamma\gamma$
puzzle | null | null | 10.1016/j.physletb.2023.137668 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decays of $\eta$ and $\eta^\prime$ mesons provide unique opportunities
for testing the properties of low energy Quantum Chromodynamics and for the
search of new physics beyond the Standard Model. However, recent experimental
results on the rare decays of
$\eta^{\left(\prime\right)}\rightarrow\pi^0\left(\eta\right)\gamma\gamma$
cannot be self-consistently described by the combination of the Vector Meson
Dominance and Linear Sigma Model employing the same set of parameters. We show
that this tension can be attributed to the presence of a leptophobic dark
photon $\mathcal{B}$, and find representative values of the parameters which
provide consistent description of these three decays, simultaneously. Unlike
existing strategies of Dalitz analysis searching for the bump at
$m_\mathcal{B}$, we propose the usage of mismatch between these decays to
constrain the parameters of the hypothetical dark photon.
| [
{
"created": "Mon, 6 Dec 2021 03:49:40 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2022 18:38:53 GMT",
"version": "v2"
}
] | 2023-01-11 | [
[
"Balytskyi",
"Yaroslav",
""
]
] | The decays of $\eta$ and $\eta^\prime$ mesons provide unique opportunities for testing the properties of low energy Quantum Chromodynamics and for the search of new physics beyond the Standard Model. However, recent experimental results on the rare decays of $\eta^{\left(\prime\right)}\rightarrow\pi^0\left(\eta\right)\gamma\gamma$ cannot be self-consistently described by the combination of the Vector Meson Dominance and Linear Sigma Model employing the same set of parameters. We show that this tension can be attributed to the presence of a leptophobic dark photon $\mathcal{B}$, and find representative values of the parameters which provide consistent description of these three decays, simultaneously. Unlike existing strategies of Dalitz analysis searching for the bump at $m_\mathcal{B}$, we propose the usage of mismatch between these decays to constrain the parameters of the hypothetical dark photon. |
1208.0961 | Pedro Bicudo | Nuno Cardoso, Pedro Bicudo, Ulrike Eilhauer, Ioanni Bouras | CuBA - a CUDA implementation of BAMPS | work done partly under the PTQCD Collaboration, contribution
Presented by Ulrike Eilhauer at the International Meeting "Excited QCD",
Peniche, Portugal, 06 - 12 May 2012 | null | null | null | hep-ph physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using CUDA as programming language, we create a code named CuBA which is
based on the CPU code "Boltzmann Approach for Many Parton Scattering (BAMPS)"
developed in Frankfurt in order to study a system of many colliding particles
resulting from heavy ion collisions. Furthermore, we benchmark our code with
the Riemann Problem and compare the results with BAMPS. They demonstrate an
improvement of the computational runtime, by one order of magitude.
| [
{
"created": "Sat, 4 Aug 2012 22:45:08 GMT",
"version": "v1"
}
] | 2012-08-16 | [
[
"Cardoso",
"Nuno",
""
],
[
"Bicudo",
"Pedro",
""
],
[
"Eilhauer",
"Ulrike",
""
],
[
"Bouras",
"Ioanni",
""
]
] | Using CUDA as programming language, we create a code named CuBA which is based on the CPU code "Boltzmann Approach for Many Parton Scattering (BAMPS)" developed in Frankfurt in order to study a system of many colliding particles resulting from heavy ion collisions. Furthermore, we benchmark our code with the Riemann Problem and compare the results with BAMPS. They demonstrate an improvement of the computational runtime, by one order of magitude. |
hep-ph/0608082 | Carlo Ewerz | Carlo Ewerz, Otto Nachtmann | Chiral Symmetry and Diffractive Neutral Pion Photo- and
Electroproduction | 22 pages, 7 figures | Eur.Phys.J.C49:685-696,2007 | 10.1140/epjc/s10052-006-0082-9 | ECT*-06-10, HD-THEP-06-16 | hep-ph | null | We show that diffractive production of a single neutral pion in
photon-induced reactions at high energy is dynamically suppressed due to the
approximate chiral symmetry of QCD. These reactions have been proposed as a
test of the odderon exchange mechanism. We show that the odderon contribution
to the amplitude for such reactions vanishes exactly in the chiral limit. This
result is obtained in a nonperturbative framework and by using PCAC relations
between the amplitudes for neutral pion and axial vector current production.
| [
{
"created": "Mon, 7 Aug 2006 17:06:49 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Ewerz",
"Carlo",
""
],
[
"Nachtmann",
"Otto",
""
]
] | We show that diffractive production of a single neutral pion in photon-induced reactions at high energy is dynamically suppressed due to the approximate chiral symmetry of QCD. These reactions have been proposed as a test of the odderon exchange mechanism. We show that the odderon contribution to the amplitude for such reactions vanishes exactly in the chiral limit. This result is obtained in a nonperturbative framework and by using PCAC relations between the amplitudes for neutral pion and axial vector current production. |
0706.3921 | Kaushik Bhattacharya | Alberto Bravo Garcia, Kaushik Bhattacharya, Sarira Sahu | The neutrino self-energy in a magnetized medium | 13 Pages, Latex file. Minor corrections included. To be published in
Modern Physics Letters A | Mod.Phys.Lett.A23:2771-2786,2008 | 10.1142/S0217732308028442 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we calculate the neutrino self-energy in presence of a
magnetized medium. The magnetized medium consists of electrons, positrons,
neutrinos and a uniform classical magnetic field. The calculation is done
assuming the background magnetic field is weak compared to the $W$-Boson mass
squared, as a consequence of which only linear order corrections in the field
are included in the $W$ boson propagator. The electron propagator consists all
order corrections in the background field. Although the neutrino self-energy in
a magnetized medium in various limiting cases has been calculated previously in
this article we produce the most general expression of the self-energy in
absence of the Landau quantization of the charged gauge fields. We calculate
the effect of the Landau quantization of the charged leptons on the neutrino
self-energy in the general case. Our calculation is specifically suited for
situations where the background plasma may be CP symmetric.
| [
{
"created": "Wed, 27 Jun 2007 18:11:38 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jul 2007 03:35:12 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Sep 2008 08:52:09 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Garcia",
"Alberto Bravo",
""
],
[
"Bhattacharya",
"Kaushik",
""
],
[
"Sahu",
"Sarira",
""
]
] | In this work we calculate the neutrino self-energy in presence of a magnetized medium. The magnetized medium consists of electrons, positrons, neutrinos and a uniform classical magnetic field. The calculation is done assuming the background magnetic field is weak compared to the $W$-Boson mass squared, as a consequence of which only linear order corrections in the field are included in the $W$ boson propagator. The electron propagator consists all order corrections in the background field. Although the neutrino self-energy in a magnetized medium in various limiting cases has been calculated previously in this article we produce the most general expression of the self-energy in absence of the Landau quantization of the charged gauge fields. We calculate the effect of the Landau quantization of the charged leptons on the neutrino self-energy in the general case. Our calculation is specifically suited for situations where the background plasma may be CP symmetric. |
hep-ph/9609531 | Marc Kamionkowski | Marc Kamionkowski | Particle Dark Matter | 13 pages, ReVTeX, to appear in the proceedings of the VIIIth
Rencontres de Blois, Neutrinos, Dark Matter, and the Universe, June 8--12,
1996, Blois, France (fixed preprint number) | null | null | CU-TP-786, CAL-616 | hep-ph astro-ph | null | Several ideas for new physics beyond the standard model may provide particle
candidates for the dark matter in the Galactic halo. The two leading candidates
are an axion and a weakly-interacting massive particle (WIMP), such as the
neutralino in supersymmetric extensions of the standard model. Several
possibilities for detection of such particles are discussed. An assessment of
the relative merits of various WIMP-detection techniques is given. I then
review the prospects for improving our knowledge of the amount, distribution,
and nature of the dark matter in the Universe from future maps of the cosmic
microwave background.
| [
{
"created": "Mon, 30 Sep 1996 18:16:20 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 1996 11:30:59 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Kamionkowski",
"Marc",
""
]
] | Several ideas for new physics beyond the standard model may provide particle candidates for the dark matter in the Galactic halo. The two leading candidates are an axion and a weakly-interacting massive particle (WIMP), such as the neutralino in supersymmetric extensions of the standard model. Several possibilities for detection of such particles are discussed. An assessment of the relative merits of various WIMP-detection techniques is given. I then review the prospects for improving our knowledge of the amount, distribution, and nature of the dark matter in the Universe from future maps of the cosmic microwave background. |
1107.2163 | Daniel Zenh\"ausern | Juan Garc\'ia-Bellido, Javier Rubio, Mikhail Shaposhnikov, Daniel
Zenh\"ausern | Higgs-Dilaton Cosmology: From the Early to the Late Universe | null | null | 10.1103/PhysRevD.84.123504 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a minimal scale-invariant extension of the Standard Model of
particle physics combined with Unimodular Gravity formulated in
\cite{Shaposhnikov:2008xb}. This theory is able to describe not only an
inflationary stage, related to the Standard Model Higgs field, but also a late
period of Dark Energy domination, associated with an almost massless dilaton. A
number of parameters can be fixed by inflationary physics, allowing to make
specific predictions for any subsequent period. In particular, we derive a
relation between the tilt of the primordial spectrum of scalar fluctuations,
$n_s$, and the present value of the equation of state parameter of dark energy,
$\omega_{DE}^0$. We find bounds for the scalar tilt, $n_s<0.97$, the associated
running, $-0.0006<d\ln n_s/d\ln k\lesssim-0.00015$, and for the
scalar-to-tensor ratio, $0.0009\lesssim r<0.0033$, which will be critically
tested by the results of the Planck mission. For the equation of state of dark
energy, the model predicts $\omega_{DE}^0>-1$. The relation between $n_s$ and
$\omega_{DE}^0$ allows us to use the current observational bounds on $n_s$ to
further constrain the dark energy equation of state to $0< 1+\omega_{DE}^0<
0.02$, which is to be confronted with future dark energy surveys.
| [
{
"created": "Mon, 11 Jul 2011 23:11:59 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"García-Bellido",
"Juan",
""
],
[
"Rubio",
"Javier",
""
],
[
"Shaposhnikov",
"Mikhail",
""
],
[
"Zenhäusern",
"Daniel",
""
]
] | We consider a minimal scale-invariant extension of the Standard Model of particle physics combined with Unimodular Gravity formulated in \cite{Shaposhnikov:2008xb}. This theory is able to describe not only an inflationary stage, related to the Standard Model Higgs field, but also a late period of Dark Energy domination, associated with an almost massless dilaton. A number of parameters can be fixed by inflationary physics, allowing to make specific predictions for any subsequent period. In particular, we derive a relation between the tilt of the primordial spectrum of scalar fluctuations, $n_s$, and the present value of the equation of state parameter of dark energy, $\omega_{DE}^0$. We find bounds for the scalar tilt, $n_s<0.97$, the associated running, $-0.0006<d\ln n_s/d\ln k\lesssim-0.00015$, and for the scalar-to-tensor ratio, $0.0009\lesssim r<0.0033$, which will be critically tested by the results of the Planck mission. For the equation of state of dark energy, the model predicts $\omega_{DE}^0>-1$. The relation between $n_s$ and $\omega_{DE}^0$ allows us to use the current observational bounds on $n_s$ to further constrain the dark energy equation of state to $0< 1+\omega_{DE}^0< 0.02$, which is to be confronted with future dark energy surveys. |
hep-ph/9609340 | null | S. Dawson (BNL) | DPF `96: The triumph of the Standard Model | Summary talk given at the 1996 DPF meeting, Minneapolis, Minn., Aug.
10-15, 1996; uses sprocl.sty, 8 pg | null | null | BNL-HET-SD-96/5 | hep-ph | null | I summarize some of the highlights of the 1996 DPF meeting, paying particular
attention to new measurements of the $W$, $Z$, and top quark masses. Precision
electroweak measurements from LEP are discussed with emphasis on recent
measurements of $R_b$ and values of the coupling constants $\alpha(M_Z^2)$ and
$\alpha_s(M_Z^2)$ are presented. Taken as a whole, the data are in spectacular
agreement with the predictions of the Standard Model.
| [
{
"created": "Thu, 12 Sep 1996 18:42:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dawson",
"S.",
"",
"BNL"
]
] | I summarize some of the highlights of the 1996 DPF meeting, paying particular attention to new measurements of the $W$, $Z$, and top quark masses. Precision electroweak measurements from LEP are discussed with emphasis on recent measurements of $R_b$ and values of the coupling constants $\alpha(M_Z^2)$ and $\alpha_s(M_Z^2)$ are presented. Taken as a whole, the data are in spectacular agreement with the predictions of the Standard Model. |
hep-ph/0304143 | Domenico Falcone | F. Buccella, D. Falcone | Bounds for the mass of the heaviest right-handed neutrino in SO(10)
theories | 7 pages, RevTex4. Few corrections | Mod.Phys.Lett.A18:1819-1824,2003 | 10.1142/S0217732303011757 | DSF-12/2003 | hep-ph | null | By relating the Dirac neutrino mass matrix to the mass of the charged
fermions and assuming that the product of the masses of the two lightest
left-handed neutrinos is of the order of $\Delta m^2_{sol}$, we derive, within
a leptogenesis scenario, a range of values for the mass of the heaviest
right-handed neutrino, centered around the scale of $B-L$ symmetry breaking in
the SO(10) theory with Pati-Salam intermediate symmetry.
| [
{
"created": "Tue, 15 Apr 2003 14:23:20 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Apr 2003 08:22:47 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Buccella",
"F.",
""
],
[
"Falcone",
"D.",
""
]
] | By relating the Dirac neutrino mass matrix to the mass of the charged fermions and assuming that the product of the masses of the two lightest left-handed neutrinos is of the order of $\Delta m^2_{sol}$, we derive, within a leptogenesis scenario, a range of values for the mass of the heaviest right-handed neutrino, centered around the scale of $B-L$ symmetry breaking in the SO(10) theory with Pati-Salam intermediate symmetry. |
2406.16286 | German Valencia | German Valencia | Pursue of CP violation in hyperon decay | Invited contribution to FTCF2024, to appear in International Journal
of Modern Physics A: (Special Issue: FTCF 2024) | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | I review the status of CP violation in hyperon decay in light of recent
progress by BESIII and the anticipated improvements at the super tau-charm
facility. I emphasize the complementarity between kaons and hyperons for
studying CP violation in $|\Delta S|=1,2$ processes.
| [
{
"created": "Mon, 24 Jun 2024 03:21:33 GMT",
"version": "v1"
}
] | 2024-06-25 | [
[
"Valencia",
"German",
""
]
] | I review the status of CP violation in hyperon decay in light of recent progress by BESIII and the anticipated improvements at the super tau-charm facility. I emphasize the complementarity between kaons and hyperons for studying CP violation in $|\Delta S|=1,2$ processes. |
1412.6679 | Antonio Bouzas | I. A. Sarmiento-Alvarado, Antonio O. Bouzas and F. Larios | Analysis of the top-quark charged-current coupling at the LHeC | 49 pages, 17 figures, final version to appear in JPG | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of $SU(2)_L\times U(1)$ dimension six operators we study the
potential of the LHeC to provide information on top quark effective
interactions. We focus on single antitop production and how it is affected not
only by the effective $tbW$ coupling but also by four-fermion operators.
Compared to the LHC, the LHeC provides a cleaner environment to make a precise
measurement of the top quark production cross section. Therefore, this machine
would give a much better assesment of $V_{tb}$ in the context of the SM or
$V_L$ in the context of higher dimension operators. The LHeC could also give a
slightly better measurement for $V_R$. For $g_R$ the HL-LHC precise
measurements of $F_L$ and $F_R$ (the $W$-boson helicity decay ratios of top)
would yield better constraints than those obtained by the LHeC. Lepton-quark
contact interactions would also be significantly better probed by the LHeC,
since the only way of measuring them at the LHC would be through leptonic top
decay which is hardly sensitive to these interactions.
| [
{
"created": "Sat, 20 Dec 2014 19:02:29 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jun 2015 14:54:54 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Sarmiento-Alvarado",
"I. A.",
""
],
[
"Bouzas",
"Antonio O.",
""
],
[
"Larios",
"F.",
""
]
] | In the context of $SU(2)_L\times U(1)$ dimension six operators we study the potential of the LHeC to provide information on top quark effective interactions. We focus on single antitop production and how it is affected not only by the effective $tbW$ coupling but also by four-fermion operators. Compared to the LHC, the LHeC provides a cleaner environment to make a precise measurement of the top quark production cross section. Therefore, this machine would give a much better assesment of $V_{tb}$ in the context of the SM or $V_L$ in the context of higher dimension operators. The LHeC could also give a slightly better measurement for $V_R$. For $g_R$ the HL-LHC precise measurements of $F_L$ and $F_R$ (the $W$-boson helicity decay ratios of top) would yield better constraints than those obtained by the LHeC. Lepton-quark contact interactions would also be significantly better probed by the LHeC, since the only way of measuring them at the LHC would be through leptonic top decay which is hardly sensitive to these interactions. |
hep-ph/9209251 | null | Rohini M. Godbole, Probir Roy and Xerxes Tata | Tau Signals of R-parity breaking at LEP 200 | 27 pages in PHYZZX, six figures (not included, available on request).
TIFR/TH/92-29,UH-511-751-92,CERN-TH.6613/92 | Nucl.Phys. B401 (1993) 67-92 | 10.1016/0550-3213(93)90298-4 | null | hep-ph | null | The detectability at LEP 200 of explicit $R$-parity breaking by tau-number
$(L_\tau)$ violating operators is considered. The assumption of
$L_\tau$-violation is motivated by the relative lack of constraints on such
couplings but similar considerations apply to explicit $L_e$- or
$L_\mu$-violation. The $LSP$, now unstable, and not necessarily neutral, decays
via $L_\tau$-violating modes. Only signals from the production and decays of
$LSP$ pairs are considered, thereby avoiding any dependence on the sparticle
mass spectrum. Rather spectacular signals are predicted: spherical events with
$m$ leptons (usually containing at least one $\tau$) and $n$ jets $(m,n \leq
4)$, the most characteristic of which are like-sign $\tau\tau$ events. These
signals are enumerated for each $LSP$ candidate and quantitative estimates are
provided for the favoured case when the $LSP$ is a neutralino. Other new
physics signals, which can mimic these signatures, are also briefly discussed.
| [
{
"created": "Fri, 18 Sep 1992 12:11:45 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Godbole",
"Rohini M.",
""
],
[
"Roy",
"Probir",
""
],
[
"Tata",
"Xerxes",
""
]
] | The detectability at LEP 200 of explicit $R$-parity breaking by tau-number $(L_\tau)$ violating operators is considered. The assumption of $L_\tau$-violation is motivated by the relative lack of constraints on such couplings but similar considerations apply to explicit $L_e$- or $L_\mu$-violation. The $LSP$, now unstable, and not necessarily neutral, decays via $L_\tau$-violating modes. Only signals from the production and decays of $LSP$ pairs are considered, thereby avoiding any dependence on the sparticle mass spectrum. Rather spectacular signals are predicted: spherical events with $m$ leptons (usually containing at least one $\tau$) and $n$ jets $(m,n \leq 4)$, the most characteristic of which are like-sign $\tau\tau$ events. These signals are enumerated for each $LSP$ candidate and quantitative estimates are provided for the favoured case when the $LSP$ is a neutralino. Other new physics signals, which can mimic these signatures, are also briefly discussed. |
1210.2572 | Jayanta Sarma Kumar | Mayuri Devee, R. Baishya and J. K. Sarma | Evolution of singlet structure functions from DGLAP equation at
next-to-next-to-leading order at small-x | 26 pages, 6 figures | Eur. Phys. J. C (2012) 72:2036 | 10.1140/epjc/s10052-012-2036-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A semi-numerical solution to Dokshitzer- Gribov-Lipatov-Altarelli-Parisi
(DGLAP) evolution equations at leading order (LO), next-to-leading order (NLO)
and next-to-next-to-leading order (NNLO) in the small-x limit is presented.
Here we have used Taylor series expansion method to solve the evolution
equations and, t- and x-evolutions of the singlet structure functions have been
obtained with such solution. We have also calculated t- and x-evolutions of
deuteron structure functions F_2^d, and the results are compared with the E665
data and NMC data. The results are also compared to those obtained by the fit
to F_2^d produced by the NNPDF collaboration based on the NMC and BCDMS data.
| [
{
"created": "Tue, 9 Oct 2012 11:48:33 GMT",
"version": "v1"
}
] | 2012-10-10 | [
[
"Devee",
"Mayuri",
""
],
[
"Baishya",
"R.",
""
],
[
"Sarma",
"J. K.",
""
]
] | A semi-numerical solution to Dokshitzer- Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations at leading order (LO), next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) in the small-x limit is presented. Here we have used Taylor series expansion method to solve the evolution equations and, t- and x-evolutions of the singlet structure functions have been obtained with such solution. We have also calculated t- and x-evolutions of deuteron structure functions F_2^d, and the results are compared with the E665 data and NMC data. The results are also compared to those obtained by the fit to F_2^d produced by the NNPDF collaboration based on the NMC and BCDMS data. |
1108.2197 | Ahmed Ali | Ahmed Ali (DESY) | Theory Overview on Spectroscopy | 14 pages, 6 figures,to be published in the Proceedings of the 13th.
International Conference at Hadron Machines - Beauty2011, April 04-08, 2011,
Amsterdam, The Netherlands | null | null | DESY 11-136 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A theoretical overview of the exotic spectroscopy in the charm and beauty
quark sector is presented. These states are unexpected harvest from the
$e^+e^-$ and hadron colliders and a permanent abode for the majority of them
has yet to be found. We argue that some of these states, in particular the
$Y_b(10890)$ and the recently discovered states $Z_b(10610)$ and $Z_b(10650)$,
discovered by the Belle collaboration are excellent candidates for tetraquark
states
$[bq][\bar{b}\bar{q}]$, with $q=u,d$ light quarks. Theoretical analyes of the
Belle data carried out in the tetraquark context is reviewed.
| [
{
"created": "Wed, 10 Aug 2011 15:17:52 GMT",
"version": "v1"
}
] | 2011-08-30 | [
[
"Ali",
"Ahmed",
"",
"DESY"
]
] | A theoretical overview of the exotic spectroscopy in the charm and beauty quark sector is presented. These states are unexpected harvest from the $e^+e^-$ and hadron colliders and a permanent abode for the majority of them has yet to be found. We argue that some of these states, in particular the $Y_b(10890)$ and the recently discovered states $Z_b(10610)$ and $Z_b(10650)$, discovered by the Belle collaboration are excellent candidates for tetraquark states $[bq][\bar{b}\bar{q}]$, with $q=u,d$ light quarks. Theoretical analyes of the Belle data carried out in the tetraquark context is reviewed. |
1511.08921 | Wan-Zhe Feng | Wan-Zhe Feng, Zuowei Liu and Pran Nath | ATLAS Diboson Excess from Stueckelberg Mechanism | 12 pages, 6 figures | JHEP 1604 (2016) 090 | 10.1007/JHEP04(2016)090 | MPP-2015-274 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the diboson excess seen by the ATLAS detector around 2 TeV in the
LHC run I at $\sqrt{s}=8$ TeV. We explore the possibility that such an excess
can arise from a $Z'$ boson which acquires mass through a $U(1)_X$ Stueckelberg
extension. The corresponding $Z'$ gauge boson is leptophobic with a mass of
around 2 TeV and has interactions with $SU(2)_L$ Yang-Mills fields and gauge
fields of the hypercharge. The analysis predicts $Z'$ decays into $WW$ and $ZZ$
as well as into $Z\gamma$. Further three-body as well as four-body decays of
the $Z'$ such as $WWZ, WW\gamma, WWZZ$ etc are predicted. In the analysis we
use the helicity formalism which allows us to exhibit the helicity structure of
the $Z'$ decay processes in an transparent manner. In particular, we are able
to show the set of vanishing helicity amplitudes in the decay of the massive
$Z'$ into two vector bosons due to angular momentum conservation with a special
choice of the reference momenta. The residual set of non-vanishing helicity
amplitudes are identified. The parameter space of the model compatible with the
diboson excess seen by the ATLAS experiment at $\sqrt s=8$ TeV is exhibited.
Estimate of the diboson excess expected at $\sqrt s= 13$ TeV with 20 fb$^{-1}$
of integrated luminosity at LHC run II is also given. It is shown that the
$WW$, $ZZ$ and $Z\gamma$ modes are predicted to be in the approximate ratio
$1:\cos^2\theta_W (1+ \alpha \tan^2\theta_W)^2/2: (1-\alpha)^2\sin^2\theta_W/2$
where $\alpha$ is the relative strength of the couplings of hypercharge gauge
fields to the couplings of the Yang-Mills gauge fields. Thus observation of the
$Z\gamma$ mode as well as three-body and four-body decay modes of the $Z'$ will
provide a definite test of the model and of a possible new source of
interaction beyond the standard model.
| [
{
"created": "Sat, 28 Nov 2015 19:27:32 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Apr 2016 19:59:00 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jun 2016 19:51:00 GMT",
"version": "v3"
}
] | 2016-06-09 | [
[
"Feng",
"Wan-Zhe",
""
],
[
"Liu",
"Zuowei",
""
],
[
"Nath",
"Pran",
""
]
] | We discuss the diboson excess seen by the ATLAS detector around 2 TeV in the LHC run I at $\sqrt{s}=8$ TeV. We explore the possibility that such an excess can arise from a $Z'$ boson which acquires mass through a $U(1)_X$ Stueckelberg extension. The corresponding $Z'$ gauge boson is leptophobic with a mass of around 2 TeV and has interactions with $SU(2)_L$ Yang-Mills fields and gauge fields of the hypercharge. The analysis predicts $Z'$ decays into $WW$ and $ZZ$ as well as into $Z\gamma$. Further three-body as well as four-body decays of the $Z'$ such as $WWZ, WW\gamma, WWZZ$ etc are predicted. In the analysis we use the helicity formalism which allows us to exhibit the helicity structure of the $Z'$ decay processes in an transparent manner. In particular, we are able to show the set of vanishing helicity amplitudes in the decay of the massive $Z'$ into two vector bosons due to angular momentum conservation with a special choice of the reference momenta. The residual set of non-vanishing helicity amplitudes are identified. The parameter space of the model compatible with the diboson excess seen by the ATLAS experiment at $\sqrt s=8$ TeV is exhibited. Estimate of the diboson excess expected at $\sqrt s= 13$ TeV with 20 fb$^{-1}$ of integrated luminosity at LHC run II is also given. It is shown that the $WW$, $ZZ$ and $Z\gamma$ modes are predicted to be in the approximate ratio $1:\cos^2\theta_W (1+ \alpha \tan^2\theta_W)^2/2: (1-\alpha)^2\sin^2\theta_W/2$ where $\alpha$ is the relative strength of the couplings of hypercharge gauge fields to the couplings of the Yang-Mills gauge fields. Thus observation of the $Z\gamma$ mode as well as three-body and four-body decay modes of the $Z'$ will provide a definite test of the model and of a possible new source of interaction beyond the standard model. |
hep-ph/0403239 | Thorsten Renk | Thorsten Renk | A comprehensive description of multiple observables in heavy-ion
collisions at SPS | 21 pages, 10 figures, submitted to J. Phys. G | J.Phys. G30 (2004) 1495 | 10.1088/0954-3899/30/10/015 | DUKE-TH-04-262 | hep-ph | null | Combining and expanding on work from previous publications, a model for the
evolution of ultrarelativistic heavy-ion collisions at the CERN SPS for 158
AGeV beam energy is presented. Based on the assumption of thermalization and a
parametrization of the space-time expansion of the produced matter, this model
is able to describe a large set of observables including hadronic momentum
spectra, correlations and abundancies, the emission of real photons, dilepton
radiation and the suppression pattern of charmonia. Each of these obervables
provides unique capabilities to study the reaction dynamics and taken together
they form a strong and consistent picture of the evolving system. Based on the
emission of hard photons, we argue that a strongly interacting, hot and dense
system with temperatures above 250 MeV has to be created early in the reaction.
Such a system is bound to be different from hadronic matter and likely to be a
quark-gluon plasma, and we find that this assumption is in line with the
subsequent evolution of the system that is reflected in other observables.
| [
{
"created": "Mon, 22 Mar 2004 15:42:09 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Aug 2004 15:26:21 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Renk",
"Thorsten",
""
]
] | Combining and expanding on work from previous publications, a model for the evolution of ultrarelativistic heavy-ion collisions at the CERN SPS for 158 AGeV beam energy is presented. Based on the assumption of thermalization and a parametrization of the space-time expansion of the produced matter, this model is able to describe a large set of observables including hadronic momentum spectra, correlations and abundancies, the emission of real photons, dilepton radiation and the suppression pattern of charmonia. Each of these obervables provides unique capabilities to study the reaction dynamics and taken together they form a strong and consistent picture of the evolving system. Based on the emission of hard photons, we argue that a strongly interacting, hot and dense system with temperatures above 250 MeV has to be created early in the reaction. Such a system is bound to be different from hadronic matter and likely to be a quark-gluon plasma, and we find that this assumption is in line with the subsequent evolution of the system that is reflected in other observables. |
2107.11788 | Mohamed Jakha | M. Baouahi, M. Ouali, M. Jakha, S. Mouslih, Y. Attaourti, B. Manaut
and S. Taj | Laser-assisted kaon decay and CPT symmetry violation | 17 pages, 5 figures, 2 tables | null | 10.1088/1612-202X/ac1e86 | null | hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we have investigated the charged kaons decay at the lowest
order in the presence of a circularly polarized laser field. To be more
precise, we have examined the leptonic decay of both positive (matter) and
negative (antimatter) kaon which weakly decay via the exchange of $W$ boson.
Indeed, we have derived the expression of the leptonic decay width, the
leptonic branching ratio, the leptonic ratio and the charged kaon lifetime by
using the decay matrix approach. In addition, by using numerical computation,
we have presented and discussed how the laser field influences these physical
quantities. Moreover, we have analyzed the effect of the laser field on the
parameter associated with the CPT symmetry. Then, we have concluded that, in
the presence of an electromagnetic field and based on this CPT symmetry
parameter, it is possible to control the dominance of matter over antimatter or
vice-versa by applying an external field to either violate or conserve the CPT
symmetry.
| [
{
"created": "Sun, 25 Jul 2021 11:40:36 GMT",
"version": "v1"
}
] | 2021-09-22 | [
[
"Baouahi",
"M.",
""
],
[
"Ouali",
"M.",
""
],
[
"Jakha",
"M.",
""
],
[
"Mouslih",
"S.",
""
],
[
"Attaourti",
"Y.",
""
],
[
"Manaut",
"B.",
""
],
[
"Taj",
"S.",
""
]
] | In this paper, we have investigated the charged kaons decay at the lowest order in the presence of a circularly polarized laser field. To be more precise, we have examined the leptonic decay of both positive (matter) and negative (antimatter) kaon which weakly decay via the exchange of $W$ boson. Indeed, we have derived the expression of the leptonic decay width, the leptonic branching ratio, the leptonic ratio and the charged kaon lifetime by using the decay matrix approach. In addition, by using numerical computation, we have presented and discussed how the laser field influences these physical quantities. Moreover, we have analyzed the effect of the laser field on the parameter associated with the CPT symmetry. Then, we have concluded that, in the presence of an electromagnetic field and based on this CPT symmetry parameter, it is possible to control the dominance of matter over antimatter or vice-versa by applying an external field to either violate or conserve the CPT symmetry. |
0902.3048 | Ikaros Bigi | I.I. Bigi | Could Charm's "Third Time" Be the Real Charm? -- A Manifesto | 15 pages, no figures; write-up of talk given to the LHCb Collab. in
November 2008 at CERN | null | null | UND-HEP-09-BIG01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observation of $D^0 - \bar D^0$ oscillations has left us in a
quandary concerning the theoretical interpretation: are they driven by SM
forces alone or do they involve new dynamics? A comprehensive analysis of \cp
symmetry in $D$ decays can probably resolve the issue. Charm studies might thus
haul in their biggest prize yet: clear evidence for the intervention of New
Physics. While the absolute size of \cp asymmetries will presumably be modest
at best, SM contributions should be much smaller still. Thus the ratio of
`signal' to `noise' -- i.e. NP over SM contributions -- might well be larger
for $D$ than $B$ transitions. A typical list of promising channels is provided,
most of which should be observable in a hadronic environment. Valuable lessons
can be obtained by analyzing three- and four-body final states.
| [
{
"created": "Wed, 18 Feb 2009 05:26:17 GMT",
"version": "v1"
}
] | 2009-02-19 | [
[
"Bigi",
"I. I.",
""
]
] | The recent observation of $D^0 - \bar D^0$ oscillations has left us in a quandary concerning the theoretical interpretation: are they driven by SM forces alone or do they involve new dynamics? A comprehensive analysis of \cp symmetry in $D$ decays can probably resolve the issue. Charm studies might thus haul in their biggest prize yet: clear evidence for the intervention of New Physics. While the absolute size of \cp asymmetries will presumably be modest at best, SM contributions should be much smaller still. Thus the ratio of `signal' to `noise' -- i.e. NP over SM contributions -- might well be larger for $D$ than $B$ transitions. A typical list of promising channels is provided, most of which should be observable in a hadronic environment. Valuable lessons can be obtained by analyzing three- and four-body final states. |
1008.1834 | Koichi Yamawaki | Koichi Yamawaki | Conformal Higgs, or techni-dilaton- composite Higgs near conformality | 17 pages, 3 figures, to be published in Proceedings of 2009 Nagoya
Global COE Workshop "Strong Coupling Gauge Theories in LHC Era" in Honor of
Toshihide Maskawa's 70th Birthday and 35th Anniversary of Dynamical Symmetry
Breaking in SCGT (SCGT 09), Dec. 8-11, 2009, Nagoya University, Nagoya
464-8602, Japan (World Scientific Co., Singapore) | Int.J.Mod.Phys.A25:5128-5144,2010 | 10.1142/S0217751X10050913 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In contrast to the folklore that Technicolor (TC) is a "Higgsless theory", we
shall discuss existence of a composite Higgs boson, Techni-Dilaton (TD), a
pseudo-Nambu-Goldstone boson of the scale invariance in the
Scale-invariant/Walking/Conformal TC (SWC TC) which generates a large anomalous
dimension $\gamma_m \simeq 1$ in a wide region from the dynamical mass $m$ $=
{\cal O}$ (TeV) of the techni-fermion all the way up to the intrinsic scale
$\Lambda_{\rm TC}$ of the SWC TC (analogue of $\Lambda_{\rm QCD}$), where
$\Lambda_{\rm TC} $ is taken typically as the scale of the Extended TC scale
$\Lambda_{\rm ETC}$: $\Lambda_{\rm TC} \simeq \Lambda_{\rm ETC}\sim10^3$ TeV $
(\gg m)$. All the techni-hadrons have mass on the same order ${\cal O} (m)$,
which in SWC TC is extremely smaller than the intrinsic scale $\Lambda_{\rm TC}
\simeq \Lambda_{\rm ETC} $, in sharp contrast to QCD where both are of the same
order. The mass of TD arises from the {\it non-perturbative scale anomaly}
associated with the techni-fermion mass generation and is typically 500-600
GeV, even {\it smaller than other techni-hadrons} of the same order of ${\cal
O} (m)$, in another contrast to QCD which is believed to have no scalar $\bar q
q$ bound state lighter than other hadrons. We discuss the TD mass in various
methods, Gauged NJL model via ladder Schwinger-Dyson (SD) equation,
straightforward calculations in the ladder SD/ Bethe-Salpeter equation, and the
holographic approach including techni-gluon condensate. The TD may be
discovered in LHC.
| [
{
"created": "Wed, 11 Aug 2010 05:43:21 GMT",
"version": "v1"
}
] | 2010-11-15 | [
[
"Yamawaki",
"Koichi",
""
]
] | In contrast to the folklore that Technicolor (TC) is a "Higgsless theory", we shall discuss existence of a composite Higgs boson, Techni-Dilaton (TD), a pseudo-Nambu-Goldstone boson of the scale invariance in the Scale-invariant/Walking/Conformal TC (SWC TC) which generates a large anomalous dimension $\gamma_m \simeq 1$ in a wide region from the dynamical mass $m$ $= {\cal O}$ (TeV) of the techni-fermion all the way up to the intrinsic scale $\Lambda_{\rm TC}$ of the SWC TC (analogue of $\Lambda_{\rm QCD}$), where $\Lambda_{\rm TC} $ is taken typically as the scale of the Extended TC scale $\Lambda_{\rm ETC}$: $\Lambda_{\rm TC} \simeq \Lambda_{\rm ETC}\sim10^3$ TeV $ (\gg m)$. All the techni-hadrons have mass on the same order ${\cal O} (m)$, which in SWC TC is extremely smaller than the intrinsic scale $\Lambda_{\rm TC} \simeq \Lambda_{\rm ETC} $, in sharp contrast to QCD where both are of the same order. The mass of TD arises from the {\it non-perturbative scale anomaly} associated with the techni-fermion mass generation and is typically 500-600 GeV, even {\it smaller than other techni-hadrons} of the same order of ${\cal O} (m)$, in another contrast to QCD which is believed to have no scalar $\bar q q$ bound state lighter than other hadrons. We discuss the TD mass in various methods, Gauged NJL model via ladder Schwinger-Dyson (SD) equation, straightforward calculations in the ladder SD/ Bethe-Salpeter equation, and the holographic approach including techni-gluon condensate. The TD may be discovered in LHC. |
hep-ph/9502312 | Brian Harris | B. W. Harris and J. Smith (ITP-Stony Brook) | Invariant mass distributions for heavy quark-antiquark pairs in deep
inelastic electroproduction | Submitted to Phys. Lett. B, 10 pages LaTeX plus 8 figures attached as
a uuencoded compressed tarred Postscript file. Complete Postsript version,
including figures, available at
ftp://insti.physics.sunysb.edu/preprints/harris/eplett.tar.Z(.gz) | Phys.Lett.B353:535-540,1995; ERRATUM-ibid.B359:423,1995 | 10.1016/0370-2693(95)00571-2 | ITP-SB-94-06 | hep-ph | null | We have completed the ${\cal O}(\alpha_s)$ QCD corrections to exclusive heavy
quark-antiquark distributions in deep inelastic electroproduction and present
here the differential distributions in the masses of charm-anticharm and
bottom-antibottom pairs at the electron-proton collider HERA.
| [
{
"created": "Wed, 15 Feb 1995 22:40:01 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Harris",
"B. W.",
"",
"ITP-Stony Brook"
],
[
"Smith",
"J.",
"",
"ITP-Stony Brook"
]
] | We have completed the ${\cal O}(\alpha_s)$ QCD corrections to exclusive heavy quark-antiquark distributions in deep inelastic electroproduction and present here the differential distributions in the masses of charm-anticharm and bottom-antibottom pairs at the electron-proton collider HERA. |
hep-ph/0411124 | Dan Pirjol | Dan Pirjol | Factorization in color-suppressed B -> D(*)0 pi0 decays from the
soft-collinear effective theory | 4 pages, 2 figures, uses ws-procs10x7.cls. Contribution to the
Proceedings of the 32nd International Conference on High Energy Physics
(ICHEP04), 16-22 August 2004, Beijing, China | null | 10.1142/9789812702227_0150 | null | hep-ph | null | The soft-collinear effective theory has been recently applied to prove novel
factorization theorems for many B decays. We describe here in some detail the
factorization relation for color-supressed nonleptonic B -> D(*)0 pi0 decays
and update the phenomenological analysis of these decays.
| [
{
"created": "Mon, 8 Nov 2004 20:25:26 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Pirjol",
"Dan",
""
]
] | The soft-collinear effective theory has been recently applied to prove novel factorization theorems for many B decays. We describe here in some detail the factorization relation for color-supressed nonleptonic B -> D(*)0 pi0 decays and update the phenomenological analysis of these decays. |
hep-ph/0409100 | Wei-Qin Zhao | Zhao Zhang, Wei-qin Zhao | Mixed tensor susceptibility of the QCD vacuum from effective quark-quark
interactions | 12 pages | Phys.Lett. B612 (2005) 207-214 | 10.1016/j.physletb.2005.03.012 | null | hep-ph | null | We calculate the mixed tensor susceptibility of QCD vacuum in the framework
of the global color symmetry model. In our calculation, the functional
integration over gluon fields can be performed and the gluonic vacuum
observable can be expressed in terms of the quark operators and the gluon
propagator. The mixed tensor susceptibility was obtained with the subtraction
of the perturbative contribution which is evaluated by the Wigner solution of
the quark gap equation. Using several different effective quark-quark
interaction models, we find the values of the mixed tensor susceptibility are
very small.
| [
{
"created": "Thu, 9 Sep 2004 02:54:01 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Zhang",
"Zhao",
""
],
[
"Zhao",
"Wei-qin",
""
]
] | We calculate the mixed tensor susceptibility of QCD vacuum in the framework of the global color symmetry model. In our calculation, the functional integration over gluon fields can be performed and the gluonic vacuum observable can be expressed in terms of the quark operators and the gluon propagator. The mixed tensor susceptibility was obtained with the subtraction of the perturbative contribution which is evaluated by the Wigner solution of the quark gap equation. Using several different effective quark-quark interaction models, we find the values of the mixed tensor susceptibility are very small. |
hep-ph/9607455 | Adrian Ghinculov | Adrian Ghinculov | Two-loop effects of enhanced electroweak strength in the Higgs sector | To be published in the proceedings of 9th International Seminar on
High-energy Physics: Quarks 96, Yaroslavl, Russia, 5-11 May 1996, e-print
numbers added to preprint references in revised version | Helv.Phys.Acta 70:822-837,1997 | null | Freiburg-THEP 96/14 | hep-ph | null | The selfcoupling of the Higgs field grows with the mass of the Higgs particle
and induces potentially large radiative corrections in the electroweak model.
The technical aspects of performing multiloop calculations in the massive case
are discussed briefly. I review the status of two-loop calculations of
radiative corrections of enhanced electroweak strength which are relevant for
the Higgs physics. I discuss the relevance of the existing results with respect
to heavy Higgs searches at future colliders and their implications regarding
the validity range of perturbation theory.
| [
{
"created": "Sun, 28 Jul 1996 17:16:21 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 1996 20:42:33 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Ghinculov",
"Adrian",
""
]
] | The selfcoupling of the Higgs field grows with the mass of the Higgs particle and induces potentially large radiative corrections in the electroweak model. The technical aspects of performing multiloop calculations in the massive case are discussed briefly. I review the status of two-loop calculations of radiative corrections of enhanced electroweak strength which are relevant for the Higgs physics. I discuss the relevance of the existing results with respect to heavy Higgs searches at future colliders and their implications regarding the validity range of perturbation theory. |
1211.6739 | Torsten Bringmann | Masaki Asano, Torsten Bringmann, Gunter Sigl, Martin Vollmann | The 130 GeV gamma-ray line and generic dark matter model building
constraints from continuum gamma rays, radio and antiproton data | 16 pages revtex4; 4 figures. Fixed typos and slightly extended
discussion, including constraints for scalar DM case. Matches published
version | Phys. Rev. D 87, 103509 (2013) | 10.1103/PhysRevD.87.103509 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis of the Fermi gamma ray space telescope data has recently revealed
a resolved gamma-ray feature close to the galactic center which is consistent
with monochromatic photons at an energy of about 130 GeV. If interpreted in
terms of dark matter (DM) annihilating into \gamma\gamma (\gamma Z, \gamma h),
this would correspond to a DM particle mass of roughly 130 GeV (145 GeV, 155
GeV). The rate for these loop-suppressed processes, however, is larger than
typically expected for thermally produced DM. Correspondingly, one would
generically expect even larger tree level production rates of standard model
fermions or gauge bosons. Here, we quantify this expectation in a rather
model-independent way by relating the tree level and loop amplitudes with the
help of the optical theorem. As an application, we consider bounds from
continuum gamma rays, radio and antiproton data on the tree level amplitudes
and translate them into constraints on the loop amplitudes. We find that,
independently of the DM production mechanism, any DM model aiming at explaining
the line signal in terms of charged standard model particles running in the
loop is in rather strong tension with at least one of these constraints, with
the exception of loops dominated by top quarks. We stress that attempts to
explain the 130 GeV feature with internal bremsstrahlung do not suffer from
such difficulties.
| [
{
"created": "Wed, 28 Nov 2012 21:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2013 14:21:28 GMT",
"version": "v2"
}
] | 2013-05-17 | [
[
"Asano",
"Masaki",
""
],
[
"Bringmann",
"Torsten",
""
],
[
"Sigl",
"Gunter",
""
],
[
"Vollmann",
"Martin",
""
]
] | An analysis of the Fermi gamma ray space telescope data has recently revealed a resolved gamma-ray feature close to the galactic center which is consistent with monochromatic photons at an energy of about 130 GeV. If interpreted in terms of dark matter (DM) annihilating into \gamma\gamma (\gamma Z, \gamma h), this would correspond to a DM particle mass of roughly 130 GeV (145 GeV, 155 GeV). The rate for these loop-suppressed processes, however, is larger than typically expected for thermally produced DM. Correspondingly, one would generically expect even larger tree level production rates of standard model fermions or gauge bosons. Here, we quantify this expectation in a rather model-independent way by relating the tree level and loop amplitudes with the help of the optical theorem. As an application, we consider bounds from continuum gamma rays, radio and antiproton data on the tree level amplitudes and translate them into constraints on the loop amplitudes. We find that, independently of the DM production mechanism, any DM model aiming at explaining the line signal in terms of charged standard model particles running in the loop is in rather strong tension with at least one of these constraints, with the exception of loops dominated by top quarks. We stress that attempts to explain the 130 GeV feature with internal bremsstrahlung do not suffer from such difficulties. |
0810.1876 | Guy F. de T\'eramond | Stanley J. Brodsky and Guy F. de Teramond | The AdS/CFT Correspondence and Light-Front QCD | 12 pages, 4 figures. Presented by SJB at LIGHT CONE 2008:
Relativistic Nuclear and Particle Physics | null | null | SLAC-PUB-13428 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify an invariant light-front coordinate $\zeta$ which allows the
separation of the dynamics of quark and gluon binding from the kinematics of
constituent spin and internal orbital angular momentum. The result is a
single-variable light-front Schrodinger equation for QCD which determines the
eigenspectrum and the light-front wavefunctions of hadrons for general spin and
orbital angular momentum. This frame-independent light-front wave equation is
equivalent to the equations of motion which describe the propagation of
spin-$J$ modes on anti-de Sitter (AdS) space. Light-front holography is a
remarkable feature of AdS/CFT: it allows hadronic amplitudes in the AdS fifth
dimension to be mapped to frame-independent light-front wavefunctions of
hadrons in physical space-time, thus providing a relativistic description of
hadrons at the amplitude level. In principle, the model can be systematically
improved by diagonalizing the full QCD light-front Hamiltonian on the AdS/QCD
basis. Quark and gluon hadronization can be computed at the amplitude level by
convoluting the off-shell $T$ matrix calculated from the QCD light-front
Hamiltonian with the hadronic light-front wavefunctions. We also note the
distinction between static observables such as the probability distributions
computed from the square of the light-front wavefunctions versus dynamical
observables such as the structure functions and the leading-twist single-spin
asymmetries measured in deep inelastic scattering which include the effects of
initial and final-state interactions.
| [
{
"created": "Fri, 10 Oct 2008 02:45:58 GMT",
"version": "v1"
}
] | 2008-10-13 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy F.",
""
]
] | We identify an invariant light-front coordinate $\zeta$ which allows the separation of the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schrodinger equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. This frame-independent light-front wave equation is equivalent to the equations of motion which describe the propagation of spin-$J$ modes on anti-de Sitter (AdS) space. Light-front holography is a remarkable feature of AdS/CFT: it allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. In principle, the model can be systematically improved by diagonalizing the full QCD light-front Hamiltonian on the AdS/QCD basis. Quark and gluon hadronization can be computed at the amplitude level by convoluting the off-shell $T$ matrix calculated from the QCD light-front Hamiltonian with the hadronic light-front wavefunctions. We also note the distinction between static observables such as the probability distributions computed from the square of the light-front wavefunctions versus dynamical observables such as the structure functions and the leading-twist single-spin asymmetries measured in deep inelastic scattering which include the effects of initial and final-state interactions. |
hep-ph/9609433 | Mike Boyce | M. M. Boyce | String Inspired QCD and $E_6$ Models | 173 pages, LaTeX, 49 figures (eps) | null | null | null | hep-ph nucl-th | null | The work in this thesis consists of two distinct parts:
A class of models called, ``String-flip potential models,'' (SFP's) are
studied as a possible candidate for modeling nuclear matter in terms of
constituent quarks. These models are inspired from lattice
quantum-chromodynamics (QCD) and are nonperturbative in nature. It is shown
that they are viable candidates for modeling nuclear matter since they
reproduce most of the bulk properties except for nuclear binding. Their
properties are studied in nuclear and mesonic matter. A new class of models is
developed, called ``flux-bubble potential models,'' which allows for the SFP's
to be extended to include perturbative QCD interactions. Attempts to obtain
nuclear binding is not successful, but valuable insight was gained towards
possible future directions to pursue.
The possibility of studying Superstring inspired $E_6$ phenomenology at high
energy hadron colliders is investigated. The production of heavy lepton pairs
{\it via} a gluon-gluon fusion mechanism is discussed. An enhancement in the
parton level cross-section is expected due to the heavy (s)fermion loops which
couple to the gluons.
| [
{
"created": "Mon, 23 Sep 1996 02:50:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boyce",
"M. M.",
""
]
] | The work in this thesis consists of two distinct parts: A class of models called, ``String-flip potential models,'' (SFP's) are studied as a possible candidate for modeling nuclear matter in terms of constituent quarks. These models are inspired from lattice quantum-chromodynamics (QCD) and are nonperturbative in nature. It is shown that they are viable candidates for modeling nuclear matter since they reproduce most of the bulk properties except for nuclear binding. Their properties are studied in nuclear and mesonic matter. A new class of models is developed, called ``flux-bubble potential models,'' which allows for the SFP's to be extended to include perturbative QCD interactions. Attempts to obtain nuclear binding is not successful, but valuable insight was gained towards possible future directions to pursue. The possibility of studying Superstring inspired $E_6$ phenomenology at high energy hadron colliders is investigated. The production of heavy lepton pairs {\it via} a gluon-gluon fusion mechanism is discussed. An enhancement in the parton level cross-section is expected due to the heavy (s)fermion loops which couple to the gluons. |
hep-ph/9912498 | Masahiro Yamaguchi | Sanghyeon Chang, Junji Hisano, Hiroaki Nakano, Nobuchika Okada, and
Masahiro Yamaguchi | Bulk Standard Model in the Randall-Sundrum Background | 18 pages, 2 figures | Phys.Rev. D62 (2000) 084025 | 10.1103/PhysRevD.62.084025 | TU-581, KEK-TH-665, NIIG-DP-99-03 | hep-ph hep-th | null | We discuss issues in an attempt to put the Standard Model (SM) in
five-dimensional anti-de Sitter spacetime compactified on $S^1/Z_2$. The
recently-proposed approach to the gauge hierarchy problem by using this
background geometry, with the SM confined on a boundary, is extended to a
situation where (some of) the SM particles reside in the five dimensional bulk.
In particular, we find a localization of zero modes of bulk fermions near the
boundary with a negative tension. Unlike the compactification with the flat
metric, these fermion zero modes couple to Kaluza-Klein (KK) excitations of the
SM gauge bosons. Interestingly, only low-lying modes of such KK gauge bosons
have non-negligible couplings. Current electroweak precision data give a
constraint that the first KK mode be heavier than 9 TeV. We also argue that at
least the Higgs field should be confined on the brane to utilize the
Randall-Sundrum background as a solution to the gauge hierarchy.
| [
{
"created": "Fri, 24 Dec 1999 07:22:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chang",
"Sanghyeon",
""
],
[
"Hisano",
"Junji",
""
],
[
"Nakano",
"Hiroaki",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | We discuss issues in an attempt to put the Standard Model (SM) in five-dimensional anti-de Sitter spacetime compactified on $S^1/Z_2$. The recently-proposed approach to the gauge hierarchy problem by using this background geometry, with the SM confined on a boundary, is extended to a situation where (some of) the SM particles reside in the five dimensional bulk. In particular, we find a localization of zero modes of bulk fermions near the boundary with a negative tension. Unlike the compactification with the flat metric, these fermion zero modes couple to Kaluza-Klein (KK) excitations of the SM gauge bosons. Interestingly, only low-lying modes of such KK gauge bosons have non-negligible couplings. Current electroweak precision data give a constraint that the first KK mode be heavier than 9 TeV. We also argue that at least the Higgs field should be confined on the brane to utilize the Randall-Sundrum background as a solution to the gauge hierarchy. |
0709.4060 | Yasunori Nomura | Yasunori Nomura and Michele Papucci | A Simple and Realistic Model of Supersymmetry Breaking | 19 pages, version to appear in Phys. Lett. B | Phys.Lett.B661:145-153,2008 | 10.1016/j.physletb.2008.01.052 | UCB-PTH-07/18 | hep-ph hep-th | null | We present a simple and realistic model of supersymmetry breaking. In
addition to the minimal supersymmetric standard model, we only introduce a
hidden sector gauge group SU(5) and three fields X, F and \bar{F}.
Supersymmetry is broken at a local minimum of the potential, and its effects
are transmitted to the supersymmetric standard model sector through both
standard model gauge loops and local operators suppressed by the cutoff scale,
which is taken to be the unification scale. The form of the local operators is
controlled by a U(1) symmetry. The generated supersymmetry breaking and mu
parameters are comparable in size, and no flavor or CP violating terms arise.
The spectrum of the first two generation superparticles is that of minimal
gauge mediation with the number of messengers N_mess = 5 and the messenger
scale 10^11 GeV < M_mess < 10^13 GeV. The spectrum of the Higgs bosons and
third generation superparticles, however, can deviate from it. The lightest
supersymmetric particle is the gravitino with a mass of order (1-10) GeV.
| [
{
"created": "Tue, 25 Sep 2007 23:18:10 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Feb 2008 18:47:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nomura",
"Yasunori",
""
],
[
"Papucci",
"Michele",
""
]
] | We present a simple and realistic model of supersymmetry breaking. In addition to the minimal supersymmetric standard model, we only introduce a hidden sector gauge group SU(5) and three fields X, F and \bar{F}. Supersymmetry is broken at a local minimum of the potential, and its effects are transmitted to the supersymmetric standard model sector through both standard model gauge loops and local operators suppressed by the cutoff scale, which is taken to be the unification scale. The form of the local operators is controlled by a U(1) symmetry. The generated supersymmetry breaking and mu parameters are comparable in size, and no flavor or CP violating terms arise. The spectrum of the first two generation superparticles is that of minimal gauge mediation with the number of messengers N_mess = 5 and the messenger scale 10^11 GeV < M_mess < 10^13 GeV. The spectrum of the Higgs bosons and third generation superparticles, however, can deviate from it. The lightest supersymmetric particle is the gravitino with a mass of order (1-10) GeV. |
0801.1802 | Thorsten Feldmann | Thorsten Feldmann (TU Munich and Univ. Siegen), Thomas Mannel (Univ.
Siegen) | Large Top Mass and Non-Linear Representation of Flavour Symmetry | 4 pages, no figures, uses revtex4 | Phys.Rev.Lett.100:171601,2008 | 10.1103/PhysRevLett.100.171601 | SI-HEP-2008-01, TUM-HEP-680/08 | hep-ph hep-th | null | We consider an effective theory (ET) approach to flavour-violating processes
beyond the Standard Model (SM), where the breaking of flavour symmetry is
described by spurion fields whose low-energy vacuum expectation values are
identified with the SM Yukawa couplings. Insisting on canonical mass dimensions
for the spurion fields, the large top-quark Yukawa coupling also implies a
large expectation value for the associated spurion, which breaks part of the
flavour symmetry already at the UV scale Lambda of the ET. Below that scale,
flavour symmetry in the ET is represented in a non-linear way by introducing
Goldstone modes for the partly broken flavour symmetry and spurion fields
transforming under the residual symmetry. As a result, the dominance of certain
flavour structures in rare quark decays can be understood in terms of the
1/Lambda expansion in the ET. We also discuss the generalization to
2-Higgs-doublet models with large tan(beta).
| [
{
"created": "Fri, 11 Jan 2008 16:30:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Feldmann",
"Thorsten",
"",
"TU Munich and Univ. Siegen"
],
[
"Mannel",
"Thomas",
"",
"Univ.\n Siegen"
]
] | We consider an effective theory (ET) approach to flavour-violating processes beyond the Standard Model (SM), where the breaking of flavour symmetry is described by spurion fields whose low-energy vacuum expectation values are identified with the SM Yukawa couplings. Insisting on canonical mass dimensions for the spurion fields, the large top-quark Yukawa coupling also implies a large expectation value for the associated spurion, which breaks part of the flavour symmetry already at the UV scale Lambda of the ET. Below that scale, flavour symmetry in the ET is represented in a non-linear way by introducing Goldstone modes for the partly broken flavour symmetry and spurion fields transforming under the residual symmetry. As a result, the dominance of certain flavour structures in rare quark decays can be understood in terms of the 1/Lambda expansion in the ET. We also discuss the generalization to 2-Higgs-doublet models with large tan(beta). |
hep-ph/9708477 | Erhan Iltan | G. Hiller (DESY, Hamburg) and E. O. Iltan (METU, Ankara) | Estimate of the long-distance contribution through b --> s \psi to the
B_{s} --> \gamma\gamma decay rate | 10 pages, 1 figure (require epsf.sty) | Mod.Phys.Lett.A12:2837-2846,1997 | 10.1142/S021773239700296X | null | hep-ph | null | The B_{s} --> \phi\psi decay is modeled through the inclusive b --> s\psi
decay. Using the Vector Meson Dominance model, the amplitude for the chain
process B_{s} --> \phi\psi --> \phi\gamma --> \gamma\gamma is estimated and it
is found to be at most 4 % of the corresponding amplitude from the O_7 type LD
contribution. The intermediate amplitude for the process B_{s} --> \phi\gamma
is compared with the corresponding one obtained by a different approach based
on the interaction of the virtual charm quark loop with soft gluons
\cite{Ruckl}. Both amplitudes are found to agree within 10 %. Further the
influence on the branching ratio B(B_{s} --> \gamma\gamma)_{SD+LD_{O7}} from
inclusive b --> s \psi is estimated as less than 1 %.
| [
{
"created": "Wed, 27 Aug 1997 16:05:14 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Hiller",
"G.",
"",
"DESY, Hamburg"
],
[
"Iltan",
"E. O.",
"",
"METU, Ankara"
]
] | The B_{s} --> \phi\psi decay is modeled through the inclusive b --> s\psi decay. Using the Vector Meson Dominance model, the amplitude for the chain process B_{s} --> \phi\psi --> \phi\gamma --> \gamma\gamma is estimated and it is found to be at most 4 % of the corresponding amplitude from the O_7 type LD contribution. The intermediate amplitude for the process B_{s} --> \phi\gamma is compared with the corresponding one obtained by a different approach based on the interaction of the virtual charm quark loop with soft gluons \cite{Ruckl}. Both amplitudes are found to agree within 10 %. Further the influence on the branching ratio B(B_{s} --> \gamma\gamma)_{SD+LD_{O7}} from inclusive b --> s \psi is estimated as less than 1 %. |
2311.06636 | Sergey Godunov | S. I. Godunov, E. K. Karkaryan, V. A. Novikov, A. N. Rozanov, M. I.
Vysotsky, E. V. Zhemchugov | On production of heavy charged particles in $\gamma\gamma$ fusion at
planned $pp$ colliders | 8 pages, 4 figures, 2 tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Production of heavy fermions in ultraperipheral collisions ($pp\to
p+\gamma\gamma+p\to p+\chi^{+}\chi^{-}+p$) and the semiexclusive reaction ($pp
\to p+\gamma\gamma^{*}+X \to p+\chi^{+}\chi^{-}+X$) is considered. Differential
and total cross sections for the energies of the planned $pp$ colliders are
presented.
| [
{
"created": "Sat, 11 Nov 2023 18:33:20 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Godunov",
"S. I.",
""
],
[
"Karkaryan",
"E. K.",
""
],
[
"Novikov",
"V. A.",
""
],
[
"Rozanov",
"A. N.",
""
],
[
"Vysotsky",
"M. I.",
""
],
[
"Zhemchugov",
"E. V.",
""
]
] | Production of heavy fermions in ultraperipheral collisions ($pp\to p+\gamma\gamma+p\to p+\chi^{+}\chi^{-}+p$) and the semiexclusive reaction ($pp \to p+\gamma\gamma^{*}+X \to p+\chi^{+}\chi^{-}+X$) is considered. Differential and total cross sections for the energies of the planned $pp$ colliders are presented. |
1204.4389 | Yibiao Chen | Yibiao Chen and Pengfei Zhuang | Dimuonium $(\mu^+\mu^-)$ Production in a Quark-Gluon Plasma | 4 pages, 3 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dimuonium $(\mu^+\mu^-)$ production in the quark-gluon plasma
created in relativistic heavy ion collisions. The production is controlled by
the process $q\bar q\rightarrow (\mu^+\mu^-)g$, and the dimuonium motion in the
plasma is described by a transport equation. While the electrodynamics
dominated dimuonium yield is not high enough, the transverse energy
distribution carries the information of the plasma at RHIC and LHC energies.
| [
{
"created": "Thu, 19 Apr 2012 15:53:52 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2012 07:34:22 GMT",
"version": "v2"
}
] | 2012-04-24 | [
[
"Chen",
"Yibiao",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | We study dimuonium $(\mu^+\mu^-)$ production in the quark-gluon plasma created in relativistic heavy ion collisions. The production is controlled by the process $q\bar q\rightarrow (\mu^+\mu^-)g$, and the dimuonium motion in the plasma is described by a transport equation. While the electrodynamics dominated dimuonium yield is not high enough, the transverse energy distribution carries the information of the plasma at RHIC and LHC energies. |
1604.06446 | Alessandro Strumia | Roberto Franceschini, Gian F. Giudice, Jernej F. Kamenik, Matthew
McCullough, Francesco Riva, Alessandro Strumia, Riccardo Torre | Digamma, what next? | 53 pages, 21 figures. v2: references added | null | 10.1007/JHEP07(2016)150 | CERN-TH-2016-090 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the 750 GeV resonance in the diphoton channel is confirmed, what are the
measurements necessary to infer the properties of the new particle and
understand its nature? We address this question in the framework of a single
new scalar particle, called digamma ($\digamma$). We describe it by an
effective field theory, which allows us to obtain general and model-independent
results, and to identify the most useful observables, whose relevance will
remain also in model-by-model analyses. We derive full expressions for the
leading-order processes and compute rates for higher-order decays, digamma
production in association with jets, gauge or Higgs bosons, and digamma pair
production. We illustrate how measurements of these higher-order processes can
be used to extract couplings, quantum numbers, and properties of the new
particle.
| [
{
"created": "Thu, 21 Apr 2016 19:57:24 GMT",
"version": "v1"
},
{
"created": "Wed, 11 May 2016 16:33:15 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Franceschini",
"Roberto",
""
],
[
"Giudice",
"Gian F.",
""
],
[
"Kamenik",
"Jernej F.",
""
],
[
"McCullough",
"Matthew",
""
],
[
"Riva",
"Francesco",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Torre",
"Riccardo... | If the 750 GeV resonance in the diphoton channel is confirmed, what are the measurements necessary to infer the properties of the new particle and understand its nature? We address this question in the framework of a single new scalar particle, called digamma ($\digamma$). We describe it by an effective field theory, which allows us to obtain general and model-independent results, and to identify the most useful observables, whose relevance will remain also in model-by-model analyses. We derive full expressions for the leading-order processes and compute rates for higher-order decays, digamma production in association with jets, gauge or Higgs bosons, and digamma pair production. We illustrate how measurements of these higher-order processes can be used to extract couplings, quantum numbers, and properties of the new particle. |
hep-ph/0510316 | Anna-Zuzana Dubnickova | C. Adamuscin, S. Dubnicka, A.Z. Dubnickova, P. Weisenpacher | Unitary and analytic model of nucleon EM structure, the puzzle with JLab
proton polarization data and new insight into proton charge distribution | 9 pages, 11 eps figures. Talk presented at the workshop on Lepton
Scattering and the Structure of Hadrons and Nuclei, Erice (Italy), September
2004 | Prog.Part.Nucl.Phys.55:228-241,2005 | 10.1016/j.ppnp.2005.01.017 | null | hep-ph | null | The Unitary and analytic model of nucleon electromagnetic structure,
describing all existing nucleon form factor data, is briefly reviewed. Then in
the framework of this model the problem of inconsistency of older proton
electric form factor data in space-like region (obtained from $% e^{-}p\to
e^{-}p$ process by the Rosenbluth technique) with recent Jefferson Lab data on
the ratio $G_{Ep}(t)/G_{Mp}(t)$ (measured in precise polarization
$\overrightarrow{e}^{-}p\to e^{-}\overrightarrow{p}$ experiment) is suggested
to be solved in favour of the latter data which, however, unlike older data
cause an existence of the form factor zero, i.e. a difraction minimum in
$|G_{Ep}(t)|$ around $t=-Q^{2}=-13$GeV$^{2}$. The new behaviour of $G_{Ep}(t)$
with the zero gives modified proton charge distribution with enlarged value of
the mean square charge radius.
| [
{
"created": "Mon, 24 Oct 2005 09:57:03 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Adamuscin",
"C.",
""
],
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. Z.",
""
],
[
"Weisenpacher",
"P.",
""
]
] | The Unitary and analytic model of nucleon electromagnetic structure, describing all existing nucleon form factor data, is briefly reviewed. Then in the framework of this model the problem of inconsistency of older proton electric form factor data in space-like region (obtained from $% e^{-}p\to e^{-}p$ process by the Rosenbluth technique) with recent Jefferson Lab data on the ratio $G_{Ep}(t)/G_{Mp}(t)$ (measured in precise polarization $\overrightarrow{e}^{-}p\to e^{-}\overrightarrow{p}$ experiment) is suggested to be solved in favour of the latter data which, however, unlike older data cause an existence of the form factor zero, i.e. a difraction minimum in $|G_{Ep}(t)|$ around $t=-Q^{2}=-13$GeV$^{2}$. The new behaviour of $G_{Ep}(t)$ with the zero gives modified proton charge distribution with enlarged value of the mean square charge radius. |
2006.11944 | Artur Ankowski | Artur M. Ankowski and Alexander Friedland | Assessing the accuracy of the GENIE event generator with
electron-scattering data | 22 pages, 20 figures, matches the published version | Phys. Rev. D 102, 053001 (2020) | 10.1103/PhysRevD.102.053001 | SLAC-PUB-17541 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision neutrino oscillation experiments of the future---of which DUNE is a
prime example---require reliable event generator tools. The 1--4 GeV energy
regime, in which DUNE will operate, is marked by the transition from the
low-energy nuclear physics domain to that of perturbative QCD, resulting in
rich and highly complex physics. Given this complexity, it is important to
establish a validation procedure capable of disentangling the physical
processes and testing each of them individually. Here, we demonstrate the
utility of this approach by benchmarking the GENIE generator, currently used by
all Fermilab-based experiments, against a broad set of inclusive
electron-scattering data. This comparison takes advantage of the fact that,
while electron-nucleus and neutrino-nucleus processes share a lot of common
physics, electron scattering gives one access to precisely known beam energies
and scattering kinematics. Exploring the kinematic parameter range relevant to
DUNE in this manner, we observe patterns of large discrepancies between the
generator and data. These discrepancies are most prominent in the
pion-producing regimes and are present not only in medium-sized nuclei,
including argon, but also in deuterium and hydrogen targets, indicating
mismodeled hadronic physics. Several directions for possible improvement are
discussed.
| [
{
"created": "Sun, 21 Jun 2020 23:57:39 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2020 06:03:17 GMT",
"version": "v2"
}
] | 2020-09-07 | [
[
"Ankowski",
"Artur M.",
""
],
[
"Friedland",
"Alexander",
""
]
] | Precision neutrino oscillation experiments of the future---of which DUNE is a prime example---require reliable event generator tools. The 1--4 GeV energy regime, in which DUNE will operate, is marked by the transition from the low-energy nuclear physics domain to that of perturbative QCD, resulting in rich and highly complex physics. Given this complexity, it is important to establish a validation procedure capable of disentangling the physical processes and testing each of them individually. Here, we demonstrate the utility of this approach by benchmarking the GENIE generator, currently used by all Fermilab-based experiments, against a broad set of inclusive electron-scattering data. This comparison takes advantage of the fact that, while electron-nucleus and neutrino-nucleus processes share a lot of common physics, electron scattering gives one access to precisely known beam energies and scattering kinematics. Exploring the kinematic parameter range relevant to DUNE in this manner, we observe patterns of large discrepancies between the generator and data. These discrepancies are most prominent in the pion-producing regimes and are present not only in medium-sized nuclei, including argon, but also in deuterium and hydrogen targets, indicating mismodeled hadronic physics. Several directions for possible improvement are discussed. |
1411.0304 | Jen-Chieh Peng | Jen-Chieh Peng | Transverse Spin Effects in Future Drell-Yan Experiments | 7 pages, 4 figures, Proceedings for the "Transversity 2014" Workshop | null | 10.1051/epjconf/20158501009 | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the current status and future prospect for probing the transverse
momentum dependent (TMD) parton distributions using the Drell-Yan process. We
focus on the Boer-Mulders and Sivers functions, which are expected to undergo a
sign-change from semi-inclusive deep-inelastic scattering (SIDIS) to Drell-Yan
process. The constraints of existing Drell-Yan and SIDIS experiments on the
signs of these functions are discussed. Future Drell-Yan measurements for the
TMDs are also presented.
| [
{
"created": "Sun, 2 Nov 2014 19:43:57 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Peng",
"Jen-Chieh",
""
]
] | We review the current status and future prospect for probing the transverse momentum dependent (TMD) parton distributions using the Drell-Yan process. We focus on the Boer-Mulders and Sivers functions, which are expected to undergo a sign-change from semi-inclusive deep-inelastic scattering (SIDIS) to Drell-Yan process. The constraints of existing Drell-Yan and SIDIS experiments on the signs of these functions are discussed. Future Drell-Yan measurements for the TMDs are also presented. |
hep-ph/9701359 | null | A. A. Pankov, N. Paver, C. Verzegnassi | Z' effects and anomalous gauge couplings at LC with polarization | 22 pages LaTex, 6 figures available on request, revised version
accepted for publication in Int. J. Mod. Phys. A | Int.J.Mod.Phys. A13 (1998) 1629-1650 | 10.1142/S0217751X98000718 | null | hep-ph | null | We show that the availability of longitudinally polarized electron beams at a
500 GeV Linear Collider would allow, from an analysis of the reaction e^+e^-\to
W^+W^-, to set stringent bounds on the couplings of a Z' of the most general
type. In addition, to some extent, it would be possible to disentangle
observable effects of the Z' from analogous ones due to competitor models with
anomalous trilinear gauge couplings.
| [
{
"created": "Thu, 23 Jan 1997 18:38:18 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 1997 19:45:20 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Pankov",
"A. A.",
""
],
[
"Paver",
"N.",
""
],
[
"Verzegnassi",
"C.",
""
]
] | We show that the availability of longitudinally polarized electron beams at a 500 GeV Linear Collider would allow, from an analysis of the reaction e^+e^-\to W^+W^-, to set stringent bounds on the couplings of a Z' of the most general type. In addition, to some extent, it would be possible to disentangle observable effects of the Z' from analogous ones due to competitor models with anomalous trilinear gauge couplings. |
hep-ph/9601215 | null | Wing Kai Wong (SLAC) | Renormalization Scale Setting for Evolution Equation of Non-Singlet
Structure Functions and Their Moments | 15 pages, RevTeX | Phys.Rev. D54 (1996) 1094-1098 | 10.1103/PhysRevD.54.1094 | SLAC-PUB-95-7063 | hep-ph | null | We use the BLM procedure to eliminate the renormalization scale ambiguity in
the evolution equation for the non-singlet deep-inelastic structure function
$F_2^{\text NS}(x,Q).$ The scale of the QCD coupling in the
$\overline{\text{MS}}$ scheme has the form $Q^*(x) = Q (1-x)^{1/2} / x~f(x) $,
where $x$ is the Bjorken variable and $f(x)$ is a smoothly varying function
bounded between 0.30 to 0.45. Equivalently, the evolution of the $n$th moment
of the structure function should contain an effective $\Lambda_{\text{QCD}}$
pattern, with $\Lambda_n \sim n^{1/2}$. This variation of $\Lambda_n$ agrees
with experimental data.
| [
{
"created": "Fri, 5 Jan 1996 03:11:34 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Wong",
"Wing Kai",
"",
"SLAC"
]
] | We use the BLM procedure to eliminate the renormalization scale ambiguity in the evolution equation for the non-singlet deep-inelastic structure function $F_2^{\text NS}(x,Q).$ The scale of the QCD coupling in the $\overline{\text{MS}}$ scheme has the form $Q^*(x) = Q (1-x)^{1/2} / x~f(x) $, where $x$ is the Bjorken variable and $f(x)$ is a smoothly varying function bounded between 0.30 to 0.45. Equivalently, the evolution of the $n$th moment of the structure function should contain an effective $\Lambda_{\text{QCD}}$ pattern, with $\Lambda_n \sim n^{1/2}$. This variation of $\Lambda_n$ agrees with experimental data. |
hep-ph/9806472 | L. C. R. Wijewardhana | Thomas Appelquist, Anuradha Ratnaweera, John Terning, L. C. R.
Wijewardhana | The Phase Structure of an SU(N) Gauge Theory with N_f Flavors | 34 pages, 1 figure. More references added | Phys.Rev.D58:105017,1998 | 10.1103/PhysRevD.58.105017 | YCTP-P15-98, UCB-PTH-98/34, LBNL-41946,UCTP-110-98 | hep-ph hep-th | null | We investigate the chiral phase transition in SU(N) gauge theories as the
number of quark flavors, $N_f$, is varied. We argue that the transition takes
place at a large enough value of $N_f$ so that it is governed by the infrared
fixed point of the $\beta$ function. We study the nature of the phase
transition analytically and numerically, and discuss the spectrum of the theory
as the critical value of $N_f$ is approached in both the symmetric and broken
phases. Since the transition is governed by a conformal fixed point, there are
no light excitations on the symmetric side. We extend previous work to include
higher order effects by developing a renormalization group estimate of the
critical coupling.
| [
{
"created": "Wed, 24 Jun 1998 18:51:38 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 1998 22:11:04 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Appelquist",
"Thomas",
""
],
[
"Ratnaweera",
"Anuradha",
""
],
[
"Terning",
"John",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] | We investigate the chiral phase transition in SU(N) gauge theories as the number of quark flavors, $N_f$, is varied. We argue that the transition takes place at a large enough value of $N_f$ so that it is governed by the infrared fixed point of the $\beta$ function. We study the nature of the phase transition analytically and numerically, and discuss the spectrum of the theory as the critical value of $N_f$ is approached in both the symmetric and broken phases. Since the transition is governed by a conformal fixed point, there are no light excitations on the symmetric side. We extend previous work to include higher order effects by developing a renormalization group estimate of the critical coupling. |
hep-ph/0008114 | Joannis Papavassiliou | J. Bernabeu, L. G. Cabral-Rosetti, J. Papavassiliou, J. Vidal | On the charge radius of the neutrino | 26 pages, plain Latex, 7 Figures in a separate ps file | Phys.Rev.D62:113012,2000 | 10.1103/PhysRevD.62.113012 | null | hep-ph | null | Using the pinch technique we construct at one-loop order a neutrino charge
radius, which is finite, depends neither on the gauge-fixing parameter nor on
the gauge-fixing scheme employed, and is process-independent. This definition
stems solely from an effective proper photon-neutrino one-loop vertex, with no
reference to box or self-energy contributions. The role of the $WW$ box in this
construction is critically examined. In particular it is shown that the
exclusion of the effective WW box from the definition of the neutrino charge
radius is not a matter of convention but is in fact dynamically realized when
the target-fermions are right-handedly polarized. In this way we obtain a
unique decomposition of effective self-energies, vertices, and boxes, which
separately respect electroweak gauge invariance. We elaborate on the tree-level
origin of the mechanism which enforces at one-loop level massive cancellations
among the longitudinal momenta appearing in the Feynman diagrams, and in
particular those associated with the non-abelian character of the theory.
Various issues related to the known connection between the pinch technique and
the Background Field Method are further clarified. Explicit closed expressions
for the neutrino charge radius are reported.
| [
{
"created": "Fri, 11 Aug 2000 16:05:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bernabeu",
"J.",
""
],
[
"Cabral-Rosetti",
"L. G.",
""
],
[
"Papavassiliou",
"J.",
""
],
[
"Vidal",
"J.",
""
]
] | Using the pinch technique we construct at one-loop order a neutrino charge radius, which is finite, depends neither on the gauge-fixing parameter nor on the gauge-fixing scheme employed, and is process-independent. This definition stems solely from an effective proper photon-neutrino one-loop vertex, with no reference to box or self-energy contributions. The role of the $WW$ box in this construction is critically examined. In particular it is shown that the exclusion of the effective WW box from the definition of the neutrino charge radius is not a matter of convention but is in fact dynamically realized when the target-fermions are right-handedly polarized. In this way we obtain a unique decomposition of effective self-energies, vertices, and boxes, which separately respect electroweak gauge invariance. We elaborate on the tree-level origin of the mechanism which enforces at one-loop level massive cancellations among the longitudinal momenta appearing in the Feynman diagrams, and in particular those associated with the non-abelian character of the theory. Various issues related to the known connection between the pinch technique and the Background Field Method are further clarified. Explicit closed expressions for the neutrino charge radius are reported. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.