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/0104051 | Ann E. Nelson | Ann E. Nelson and Matthew J. Strassler | Exact Results for Supersymmetric Renormalization and the Supersymmetric
Flavor Problem | 38 pages | JHEP 0207 (2002) 021 | 10.1088/1126-6708/2002/07/021 | UQ/PT 01/10 | hep-ph | null | We explore the effects of a strongly-coupled, approximately scale-invariant
sector on the renormalization of soft supersymmetry breaking terms. A useful
formalism for deriving exact results for renormalization of soft supersymmetry
breaking terms is given in an appendix, and used to generalize previously known
results to include the effects of nontrilinear superpotential terms. We show
that a class of theories which explain the flavor hierarchy without flavor
symmetries can also solve the supersymmetric flavor problem by producing nearly
degenerate masses for the first two generations of scalar superpartners within
each charge sector. Effects from trilinear scalar terms are also suppressed,
although their initial values must be relatively small. Our mechanism results
in testable predictions for the superpartner spectrum.
| [
{
"created": "Wed, 4 Apr 2001 19:08:12 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2002 17:54:28 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Nelson",
"Ann E.",
""
],
[
"Strassler",
"Matthew J.",
""
]
] | We explore the effects of a strongly-coupled, approximately scale-invariant sector on the renormalization of soft supersymmetry breaking terms. A useful formalism for deriving exact results for renormalization of soft supersymmetry breaking terms is given in an appendix, and used to generalize previously known results to include the effects of nontrilinear superpotential terms. We show that a class of theories which explain the flavor hierarchy without flavor symmetries can also solve the supersymmetric flavor problem by producing nearly degenerate masses for the first two generations of scalar superpartners within each charge sector. Effects from trilinear scalar terms are also suppressed, although their initial values must be relatively small. Our mechanism results in testable predictions for the superpartner spectrum. |
hep-ph/9808460 | Giorgio Papini | G. Lambiase, G. Papini and G. Scarpetta | Maximal Acceleration Limits on the Mass of the Higgs Boson | LaTex file, 13 pages, to be published in Il Nuovo Cimento B | Nuovo Cim.B114:189-197,1999 | null | null | hep-ph | null | Caianiello's quantum geometrical model with maximal acceleration places the
upper limit $\mu\leq 719.5$ GeV on the mass of the Higgs boson. The model also
provides an equation linking the mass of the W boson to the Higgs mass $\mu$
and independent symmetry breaking and mass generating mechanisms. These may
further restrict the value of $\mu$.
| [
{
"created": "Fri, 28 Aug 1998 16:14:39 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Lambiase",
"G.",
""
],
[
"Papini",
"G.",
""
],
[
"Scarpetta",
"G.",
""
]
] | Caianiello's quantum geometrical model with maximal acceleration places the upper limit $\mu\leq 719.5$ GeV on the mass of the Higgs boson. The model also provides an equation linking the mass of the W boson to the Higgs mass $\mu$ and independent symmetry breaking and mass generating mechanisms. These may further restrict the value of $\mu$. |
2306.11097 | Xing Wang | Alexander Belyaev, R. Sekhar Chivukula, Benjamin Fuks, Elizabeth H.
Simmons, Xing Wang | Vector-Like Top Quark Production via an Electroweak Dipole Moment at a
Muon Collider | 37 pages, 11 figures, 1 table. matches published version | Phys.Rev.D 108 (2023) 3, 035016 | 10.1103/PhysRevD.108.035016 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vectorial partners of the Standard Model quarks and leptons are predicted in
many dynamical models of electroweak symmetry breaking. The most easily
accessible of these new particles, either due to mass or couplings, are
typically expected to be the partners of the third-generation fermions. It is
therefore essential to explore the signatures of these particles at future
high-energy colliders. We study the potential of a high-energy muon collider to
singly produce a vector-like top-quark partner via an electroweak dipole moment
operator, such an operator being typical of composite constructions beyond the
Standard Model. We use a phenomenological model for third-generation quarks and
their partners that satisfies an extended custodial symmetry. This
automatically protects the $W$-boson and $Z$-boson masses from receiving large
electroweak corrections, and it allows the model to be viable given current
electroweak data. We demonstrate that cross sections associated with
dipole-induced vector-like quark production can easily exceed those inherent to
more conventional single-production modes via ordinary electroweak couplings.
We then explore the associated phenomenology, and we show that at least one
(and often more than one) of the extra vector-like states can be studied at
high-energy muon colliders. Typical accessible masses are found to range up to
close to the kinematic production threshold, when the vector-like partners are
produced in combination with an ordinary top quark.
| [
{
"created": "Mon, 19 Jun 2023 18:00:52 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Aug 2023 06:04:10 GMT",
"version": "v2"
}
] | 2023-08-23 | [
[
"Belyaev",
"Alexander",
""
],
[
"Chivukula",
"R. Sekhar",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Simmons",
"Elizabeth H.",
""
],
[
"Wang",
"Xing",
""
]
] | Vectorial partners of the Standard Model quarks and leptons are predicted in many dynamical models of electroweak symmetry breaking. The most easily accessible of these new particles, either due to mass or couplings, are typically expected to be the partners of the third-generation fermions. It is therefore essential to explore the signatures of these particles at future high-energy colliders. We study the potential of a high-energy muon collider to singly produce a vector-like top-quark partner via an electroweak dipole moment operator, such an operator being typical of composite constructions beyond the Standard Model. We use a phenomenological model for third-generation quarks and their partners that satisfies an extended custodial symmetry. This automatically protects the $W$-boson and $Z$-boson masses from receiving large electroweak corrections, and it allows the model to be viable given current electroweak data. We demonstrate that cross sections associated with dipole-induced vector-like quark production can easily exceed those inherent to more conventional single-production modes via ordinary electroweak couplings. We then explore the associated phenomenology, and we show that at least one (and often more than one) of the extra vector-like states can be studied at high-energy muon colliders. Typical accessible masses are found to range up to close to the kinematic production threshold, when the vector-like partners are produced in combination with an ordinary top quark. |
1803.02037 | Guo-Yuan Huang | Guo-yuan Huang, Jun-Hao Liu, Shun Zhou | Matter effects on the flavor conversions of solar neutrinos and
high-energy astrophysical neutrinos | 20 pages, 2 figures, accepted by Nuclear Physics B | Nucl. Phys. B 931 (2018) 324 | 10.1016/j.nuclphysb.2018.04.024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Can we observe the solar eclipses in the neutrino light? In principle, this
is possible by identifying the lunar matter effects on the flavor conversions
of solar neutrinos when they traverse the Moon before reaching the detectors at
the Earth. Unfortunately, we show that the lunar matter effects on the survival
probability of solar $^8{\rm B}$ neutrinos are suppressed by an additional
factor of $1.2\%$, compared to the day-night asymmetry. However, we point out
that the matter effects on the flavor conversions of high-energy astrophysical
neutrinos, when they propagate through the Sun, can be significant. Though the
flavor composition of high-energy neutrinos can be remarkably modified, it is
quite challenging to observe such effects even in the next-generation of
neutrino telescopes.
| [
{
"created": "Tue, 6 Mar 2018 07:15:33 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2018 01:46:57 GMT",
"version": "v2"
}
] | 2018-05-09 | [
[
"Huang",
"Guo-yuan",
""
],
[
"Liu",
"Jun-Hao",
""
],
[
"Zhou",
"Shun",
""
]
] | Can we observe the solar eclipses in the neutrino light? In principle, this is possible by identifying the lunar matter effects on the flavor conversions of solar neutrinos when they traverse the Moon before reaching the detectors at the Earth. Unfortunately, we show that the lunar matter effects on the survival probability of solar $^8{\rm B}$ neutrinos are suppressed by an additional factor of $1.2\%$, compared to the day-night asymmetry. However, we point out that the matter effects on the flavor conversions of high-energy astrophysical neutrinos, when they propagate through the Sun, can be significant. Though the flavor composition of high-energy neutrinos can be remarkably modified, it is quite challenging to observe such effects even in the next-generation of neutrino telescopes. |
2006.16935 | Sebastian Steinbei{\ss}er | Rafael L. Delgado and Sebastian Steinbei{\ss}er and Michael Strickland
and Johannes H. Weber | The Relativistic Schr\"odinger Equation through FFTW3: An Extension of
quantumfdtd | 45 pages, 51 plots, journal version | Comput.Phys.Commun. 272 (2022) 108250 | 10.1016/j.cpc.2021.108250 | TUM-EFT 137/20 | hep-ph hep-lat physics.comp-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to solve the time-independent three-dimensional Schr\"odinger
equation, one can transform the time-dependent Schr\"odinger equation to
imaginary time and use a parallelized iterative method to obtain the full
three-dimensional eigenstates and eigenvalues on very large lattices. In the
case of the non-relativistic Schr\"odinger equation, there exists a publicly
available code called quantumfdtd which implements this algorithm. In this
paper, we (a) extend the quantumfdtd code to include the case of the
relativistic Schr\"odinger equation and (b) add two optimized FFT-based kinetic
energy terms for non-relativistic cases. The new kinetic energy terms (two
non-relativistic and one relativistic) are computed using the parallelized Fast
Fourier Transform (FFT) algorithm provided by the FFTW library. The resulting
quantumfdtd v3 code, which is publicly released with this paper, is backwards
compatible with version 2, supporting explicit finite differences schemes in
addition to the new FFT-based schemes. Finally, the original code has been
extended so that it supports arbitrary external file-based potentials and the
option to project out distinct parity eigenstates from the solutions. Herein,
we provide details of the quantumfdtd v3 implementation, comparisons and tests
of the three new kinetic energy terms, and code documentation.
| [
{
"created": "Tue, 30 Jun 2020 16:07:34 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Dec 2021 10:08:13 GMT",
"version": "v2"
}
] | 2021-12-16 | [
[
"Delgado",
"Rafael L.",
""
],
[
"Steinbeißer",
"Sebastian",
""
],
[
"Strickland",
"Michael",
""
],
[
"Weber",
"Johannes H.",
""
]
] | In order to solve the time-independent three-dimensional Schr\"odinger equation, one can transform the time-dependent Schr\"odinger equation to imaginary time and use a parallelized iterative method to obtain the full three-dimensional eigenstates and eigenvalues on very large lattices. In the case of the non-relativistic Schr\"odinger equation, there exists a publicly available code called quantumfdtd which implements this algorithm. In this paper, we (a) extend the quantumfdtd code to include the case of the relativistic Schr\"odinger equation and (b) add two optimized FFT-based kinetic energy terms for non-relativistic cases. The new kinetic energy terms (two non-relativistic and one relativistic) are computed using the parallelized Fast Fourier Transform (FFT) algorithm provided by the FFTW library. The resulting quantumfdtd v3 code, which is publicly released with this paper, is backwards compatible with version 2, supporting explicit finite differences schemes in addition to the new FFT-based schemes. Finally, the original code has been extended so that it supports arbitrary external file-based potentials and the option to project out distinct parity eigenstates from the solutions. Herein, we provide details of the quantumfdtd v3 implementation, comparisons and tests of the three new kinetic energy terms, and code documentation. |
1509.06013 | Adil Belhaj Rogani | Adil Belhaj, Salah Eddine Ennadifi, Moulay Brahim Sedra | Exotic Hadrons and Underlying Z_{2,3} Symmetries | 8 pages, 4 figures. Latex. Accepted in Communications in Theoretical
Physics (CPT), (2015) | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observation of higher quark combinations, tetraquarks and
pentaquarks, is a strong indication of more exotic hadrons. Using Z_{2} and
Z_{3} symmetries and standard model data, a general quark combination producing
new hadronic states is proposed in terms of polygon geometries according to the
Dynkin diagrams of \widehat{A}_{n} affine Lie algebras. It has been shown that
Z_{\mathbf{2,3}} invariance is crucial in the determination of the mesonic or
the baryonic nature of these states. The hexagonal geometry is considered in
some details producing both mesonic and baryonic states. A general class of
this family is also presented.
| [
{
"created": "Sun, 20 Sep 2015 13:29:42 GMT",
"version": "v1"
}
] | 2015-11-05 | [
[
"Belhaj",
"Adil",
""
],
[
"Ennadifi",
"Salah Eddine",
""
],
[
"Sedra",
"Moulay Brahim",
""
]
] | The recent observation of higher quark combinations, tetraquarks and pentaquarks, is a strong indication of more exotic hadrons. Using Z_{2} and Z_{3} symmetries and standard model data, a general quark combination producing new hadronic states is proposed in terms of polygon geometries according to the Dynkin diagrams of \widehat{A}_{n} affine Lie algebras. It has been shown that Z_{\mathbf{2,3}} invariance is crucial in the determination of the mesonic or the baryonic nature of these states. The hexagonal geometry is considered in some details producing both mesonic and baryonic states. A general class of this family is also presented. |
1811.11570 | Vincent Cheung | Vincent Cheung and Ramona Vogt | Production and polarization of prompt $\varUpsilon$($n$S) in the
improved color evaporation model using the $k_T$-factorization approach | arXiv admin note: substantial text overlap with arXiv:1808.02909 | Phys. Rev. D 99, 034007 (2019) | 10.1103/PhysRevD.99.034007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the polarization of prompt $\varUpsilon$($n$S) production in the
improved color evaporation model at leading order employing the
$k_T$-factorization approach. We present the polarization parameter
$\lambda_\vartheta$ of prompt $\varUpsilon$($n$S) as a function of transverse
momentum in $p+p$ and $p+\bar{p}$ collisions to compare with data in the
helicity, Collins-Soper and Gottfried-Jackson frames. We also present
calculations of the bottomonium production cross sections as a function of
transverse momentum and rapidity. This is the first $p_T$-dependent calculation
of bottomonium production and polarization in the improved color evaporation
model. We find agreement with both bottomonium cross sections and polarization
measurements.
| [
{
"created": "Mon, 26 Nov 2018 23:48:38 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Cheung",
"Vincent",
""
],
[
"Vogt",
"Ramona",
""
]
] | We calculate the polarization of prompt $\varUpsilon$($n$S) production in the improved color evaporation model at leading order employing the $k_T$-factorization approach. We present the polarization parameter $\lambda_\vartheta$ of prompt $\varUpsilon$($n$S) as a function of transverse momentum in $p+p$ and $p+\bar{p}$ collisions to compare with data in the helicity, Collins-Soper and Gottfried-Jackson frames. We also present calculations of the bottomonium production cross sections as a function of transverse momentum and rapidity. This is the first $p_T$-dependent calculation of bottomonium production and polarization in the improved color evaporation model. We find agreement with both bottomonium cross sections and polarization measurements. |
1504.01707 | Gerhard Buchalla | G. Buchalla, O. Cata, A. Celis, C. Krause | Note on Anomalous Higgs-Boson Couplings in Effective Field Theory | 7 pages, no figures; typos corrected; references added | null | 10.1016/j.physletb.2015.09.027 | LMU-ASC 19/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a parametrization of anomalous Higgs-boson couplings that is both
systematic and practical. It is based on the electroweak chiral Lagrangian,
including a light Higgs boson, as the effective field theory (EFT) at the
electroweak scale $v$. This is the appropriate framework for the case of
sizeable deviations in the Higgs couplings of order $10\%$ from the Standard
Model, considered to be parametrically larger than new-physics effects in the
sector of electroweak gauge interactions. The role of power counting in
identifying the relevant parameters is emphasized. The three relevant scales,
$v$, the scale of new Higgs dynamics $f$, and the cut-off $\Lambda=4\pi f$,
admit expansions in $\xi=v^2/f^2$ and $f^2/\Lambda^2$. The former corresponds
to an organization of operators by their canonical dimension, the latter by
their loop order or chiral dimension. In full generality the EFT is thus
organized as a double expansion. However, as long as $\xi\gg 1/16\pi^2$ the EFT
systematics is closer to the chiral counting. The leading effects in the
consistent approximation provided by the EFT, relevant for the presently most
important processes of Higgs production and decay, are given by a few
(typically six) couplings. These parameters allow us to describe the properties
of the Higgs boson in a general and systematic way, and with a precision
adequate for the measurements to be performed at the LHC. The framework can be
systematically extended to include loop corrections and higher-order terms in
the EFT.
| [
{
"created": "Tue, 7 Apr 2015 19:12:09 GMT",
"version": "v1"
},
{
"created": "Tue, 26 May 2015 18:08:27 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Sep 2015 15:15:20 GMT",
"version": "v3"
}
] | 2015-09-30 | [
[
"Buchalla",
"G.",
""
],
[
"Cata",
"O.",
""
],
[
"Celis",
"A.",
""
],
[
"Krause",
"C.",
""
]
] | We propose a parametrization of anomalous Higgs-boson couplings that is both systematic and practical. It is based on the electroweak chiral Lagrangian, including a light Higgs boson, as the effective field theory (EFT) at the electroweak scale $v$. This is the appropriate framework for the case of sizeable deviations in the Higgs couplings of order $10\%$ from the Standard Model, considered to be parametrically larger than new-physics effects in the sector of electroweak gauge interactions. The role of power counting in identifying the relevant parameters is emphasized. The three relevant scales, $v$, the scale of new Higgs dynamics $f$, and the cut-off $\Lambda=4\pi f$, admit expansions in $\xi=v^2/f^2$ and $f^2/\Lambda^2$. The former corresponds to an organization of operators by their canonical dimension, the latter by their loop order or chiral dimension. In full generality the EFT is thus organized as a double expansion. However, as long as $\xi\gg 1/16\pi^2$ the EFT systematics is closer to the chiral counting. The leading effects in the consistent approximation provided by the EFT, relevant for the presently most important processes of Higgs production and decay, are given by a few (typically six) couplings. These parameters allow us to describe the properties of the Higgs boson in a general and systematic way, and with a precision adequate for the measurements to be performed at the LHC. The framework can be systematically extended to include loop corrections and higher-order terms in the EFT. |
2103.14657 | Xin-Nian Wang | Wenbin Zhao, Weiyao Ke, Wei Chen, Tan Luo and Xin-Nian Wang | From hydro to jet quenching, coalescence and hadron cascade: a coupled
approach to solving the $R_{AA}\otimes v_2$ puzzle | 4 pages in RevTex with 6 figures. Final published version | null | 10.1103/PhysRevLett.128.022302 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Hydrodynamics and jet quenching are responsible for the elliptic flow $v_2$
and suppression of large transverse momentum ($p_T$) hadrons, respectively, two
of the most important phenomena leading to the discovery of a strongly coupled
quark-gluon plasma (QGP) in high-energy heavy-ion collisions. A consistent
description of the hadron suppression factor $R_{AA}$ and $v_2$, especially at
intermediate $p_T$, however, remains a challenge. We solve this long-standing
$R_{AA}\otimes v_2$ puzzle by including quark coalescence for hadronization and
final state hadron cascade in the coupled linear Boltzmann transport-hydro
model that combines concurrent jet transport and hydrodynamic evolution of the
bulk medium. We illustrate that quark coalescence and hadron cascade, two keys
to solving the puzzle, also lead to a splitting of $v_2$ for pions, kaons and
protons in the intermediate $p_T$ region. We demonstrate for the first time
that experimental data on $R_{AA}$, $v_2$ and their hadron flavor dependence
from low to intermediate and high $p_T$ in high-energy heavy-ion collisions can
be understood within this coupled framework.
| [
{
"created": "Fri, 26 Mar 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Apr 2021 18:48:49 GMT",
"version": "v2"
},
{
"created": "Sat, 19 Mar 2022 01:24:44 GMT",
"version": "v3"
}
] | 2022-03-22 | [
[
"Zhao",
"Wenbin",
""
],
[
"Ke",
"Weiyao",
""
],
[
"Chen",
"Wei",
""
],
[
"Luo",
"Tan",
""
],
[
"Wang",
"Xin-Nian",
""
]
] | Hydrodynamics and jet quenching are responsible for the elliptic flow $v_2$ and suppression of large transverse momentum ($p_T$) hadrons, respectively, two of the most important phenomena leading to the discovery of a strongly coupled quark-gluon plasma (QGP) in high-energy heavy-ion collisions. A consistent description of the hadron suppression factor $R_{AA}$ and $v_2$, especially at intermediate $p_T$, however, remains a challenge. We solve this long-standing $R_{AA}\otimes v_2$ puzzle by including quark coalescence for hadronization and final state hadron cascade in the coupled linear Boltzmann transport-hydro model that combines concurrent jet transport and hydrodynamic evolution of the bulk medium. We illustrate that quark coalescence and hadron cascade, two keys to solving the puzzle, also lead to a splitting of $v_2$ for pions, kaons and protons in the intermediate $p_T$ region. We demonstrate for the first time that experimental data on $R_{AA}$, $v_2$ and their hadron flavor dependence from low to intermediate and high $p_T$ in high-energy heavy-ion collisions can be understood within this coupled framework. |
2005.11971 | Mingyang Yang Mr. | Mingyang Yang and Ping Wang | Electromagnetic form factors of octet baryons with the nonlocal chiral
effective theory | null | Phys. Rev. D 102, 056024 (2020) | 10.1103/PhysRevD.102.056024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electromagnetic form factors of octet baryons are investigated with the
nonlocal chiral effective theory. The nonlocal interaction generates both the
regulator which makes the loop integral convergent and the $Q^2$ dependence of
form factors at tree level. Both octet and decuplet intermediate states are
included in the one loop calculation. The momentum dependence of baryon form
factors are studied up to 1 GeV$^2$ with the same number of parameters as for
the nucleon form factors. The obtained magnetic moments of all the baryon
octets as well as the radii are in good agreement with the experimental data
and/or lattice simulation.
| [
{
"created": "Mon, 25 May 2020 08:26:49 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Sep 2020 09:07:41 GMT",
"version": "v2"
},
{
"created": "Sat, 31 Oct 2020 13:36:32 GMT",
"version": "v3"
}
] | 2020-11-03 | [
[
"Yang",
"Mingyang",
""
],
[
"Wang",
"Ping",
""
]
] | The electromagnetic form factors of octet baryons are investigated with the nonlocal chiral effective theory. The nonlocal interaction generates both the regulator which makes the loop integral convergent and the $Q^2$ dependence of form factors at tree level. Both octet and decuplet intermediate states are included in the one loop calculation. The momentum dependence of baryon form factors are studied up to 1 GeV$^2$ with the same number of parameters as for the nucleon form factors. The obtained magnetic moments of all the baryon octets as well as the radii are in good agreement with the experimental data and/or lattice simulation. |
hep-ph/0304184 | Yaroslav D. Krivenko | Ya.D.Krivenko-Emetov (Institute for Nuclear Research, Kiev) | On the theory of quasielastic lepton-hadron scattering | 11 pages, 2 figures | null | null | null | hep-ph | null | The $F_{2}$ structure functions of the inelastic lepton-hadron scattering is
calculated in the case of non-zero intermediate gluon-quarks self-energy
$M_{gq}^{2}$ and quasielastic limit. It is shown that in the quasielastic limit
the evolution equation can been solved in case massive particles as QCD ladder
calculation results. The intermediate gluon-quarks self-energy, or polarization
mass is introduced as a parameter in two cases: 1) has not energy momentum
dependence and 2) momentum dependence case. At the case 1) of massive particles
we compare our result with Shirkov calculates (D.V.Shirkov 1999).It has been
shown (case 2.) that the proton structure function $F_{2}$ calculated at
realistic values of $M_{gq}^{2}$ in high energy limit transfer to standard QCD
ladder calculation results.
| [
{
"created": "Mon, 21 Apr 2003 13:43:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krivenko-Emetov",
"Ya. D.",
"",
"Institute for Nuclear Research, Kiev"
]
] | The $F_{2}$ structure functions of the inelastic lepton-hadron scattering is calculated in the case of non-zero intermediate gluon-quarks self-energy $M_{gq}^{2}$ and quasielastic limit. It is shown that in the quasielastic limit the evolution equation can been solved in case massive particles as QCD ladder calculation results. The intermediate gluon-quarks self-energy, or polarization mass is introduced as a parameter in two cases: 1) has not energy momentum dependence and 2) momentum dependence case. At the case 1) of massive particles we compare our result with Shirkov calculates (D.V.Shirkov 1999).It has been shown (case 2.) that the proton structure function $F_{2}$ calculated at realistic values of $M_{gq}^{2}$ in high energy limit transfer to standard QCD ladder calculation results. |
2009.04191 | Georgii Shestakov | N.N. Achasov, J.V. Bennett, A.V. Kiselev, E.A. Kozyrev, G.N. Shestakov | Evidence of the four-quark nature of $f_0(980)$ and $f_0(500)$ | 6 pages, 3 figures, v2: improved discussion, references corrected,
matched the pudlished version in Phys. Rev. D | Phys. Rev. D 103, 014010 (2021) | 10.1103/PhysRevD.103.014010 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There exists a great deal of concrete evidence in favor of the exotic
four-quark nature of light scalars. At the same time, the further expansion of
the area of the $q^2\bar q^2$ model validity for light scalars on ever new
processes seems extremely interesting and important. We analyze the BESIII data
on the decay $J/\psi\to \gamma\pi^0\pi^0$ and show that the results of this
high-statistics experiment can be interpreted in favor of the four-quark nature
of light scalar mesons $f_0(980)$ and $f_0(500)$.
| [
{
"created": "Wed, 9 Sep 2020 09:57:07 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2021 17:37:39 GMT",
"version": "v2"
}
] | 2021-01-20 | [
[
"Achasov",
"N. N.",
""
],
[
"Bennett",
"J. V.",
""
],
[
"Kiselev",
"A. V.",
""
],
[
"Kozyrev",
"E. A.",
""
],
[
"Shestakov",
"G. N.",
""
]
] | There exists a great deal of concrete evidence in favor of the exotic four-quark nature of light scalars. At the same time, the further expansion of the area of the $q^2\bar q^2$ model validity for light scalars on ever new processes seems extremely interesting and important. We analyze the BESIII data on the decay $J/\psi\to \gamma\pi^0\pi^0$ and show that the results of this high-statistics experiment can be interpreted in favor of the four-quark nature of light scalar mesons $f_0(980)$ and $f_0(500)$. |
hep-ph/9808443 | Laura Reina | Sally Dawson (BNL) and Laura Reina (FSU) | QCD Corrections to Associated Higgs Boson-Heavy Quark Production | 18 pages, 11 figures, version to appear in Phys. Rev. D | Phys.Rev. D59 (1999) 054012 | 10.1103/PhysRevD.59.054012 | MADPH-98-1073, FSU-HEP-980812, BNL-HET-98/27 | hep-ph | null | We compute the O(alpha_s) QCD corrections to the inclusive process e^+e^- -->
t \bar t h. Although the total rate is small, it has a distinctive experimental
signature and can potentially be used to measure the top quark-Higgs boson
Yukawa coupling. The QCD corrections increase the rate by a factor of roughly
1.5 for e^+e^- --> t \bar t h at sqrt(s)=500 GeV and Mh=100 GeV. At sqrt(s)=1
TeV, the corrections are small.
| [
{
"created": "Thu, 27 Aug 1998 20:32:32 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Dec 1998 20:03:08 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Dawson",
"Sally",
"",
"BNL"
],
[
"Reina",
"Laura",
"",
"FSU"
]
] | We compute the O(alpha_s) QCD corrections to the inclusive process e^+e^- --> t \bar t h. Although the total rate is small, it has a distinctive experimental signature and can potentially be used to measure the top quark-Higgs boson Yukawa coupling. The QCD corrections increase the rate by a factor of roughly 1.5 for e^+e^- --> t \bar t h at sqrt(s)=500 GeV and Mh=100 GeV. At sqrt(s)=1 TeV, the corrections are small. |
hep-ph/0105010 | Francisco Brito | Francisco A. Brito, Mirjam Cvetic, SangChul Yoon | From a Thick to a Thin Supergravity Domain Wall | Latex, 13 pages, Accepted to Physical Review D | Phys.Rev.D64:064021,2001 | 10.1103/PhysRevD.64.064021 | UPR-939-T | hep-ph gr-qc hep-th | null | Within D=4 N=1 supergravity theory we obtain an effective theory of the thin
wall limit for a flat domain wall configuration, interpolating between isolated
supersymmetric extrema of the matter potential. We focus on the Z_2 symmetric
flat wall and derive the supersymmetric effective action both in the bulk and
on the wall; in the thin wall limit the scalar field, forming the wall, is
frozen, and provides the delta function domain wall source, while its fermionic
partner decouples due to its large mass. In addition, the interaction between
the gravitational supermultiplet and the interaction of the matter multiplet
decouples on the wall. While the results are explicitly demonstrated within N=1
D=4 supergravity, we also provide a generalization of the result to
D-dimensions.
| [
{
"created": "Wed, 2 May 2001 04:38:33 GMT",
"version": "v1"
},
{
"created": "Wed, 9 May 2001 00:00:14 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jun 2001 21:57:17 GMT",
"version": "v3"
}
] | 2009-09-17 | [
[
"Brito",
"Francisco A.",
""
],
[
"Cvetic",
"Mirjam",
""
],
[
"Yoon",
"SangChul",
""
]
] | Within D=4 N=1 supergravity theory we obtain an effective theory of the thin wall limit for a flat domain wall configuration, interpolating between isolated supersymmetric extrema of the matter potential. We focus on the Z_2 symmetric flat wall and derive the supersymmetric effective action both in the bulk and on the wall; in the thin wall limit the scalar field, forming the wall, is frozen, and provides the delta function domain wall source, while its fermionic partner decouples due to its large mass. In addition, the interaction between the gravitational supermultiplet and the interaction of the matter multiplet decouples on the wall. While the results are explicitly demonstrated within N=1 D=4 supergravity, we also provide a generalization of the result to D-dimensions. |
2007.01737 | Hee Sok Chung | Hee Sok Chung | ${\overline{\rm MS}}$ renormalization of $S$-wave quarkonium
wavefunctions at the origin | 62 pages, 9 figures, 2 tables, typos corrected, version published in
JHEP | JHEP12(2020)065 | 10.1007/JHEP12(2020)065 | TUM-EFT 135/20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute $S$-wave quarkonium wavefunctions at the origin in the
$\overline{\rm MS}$ scheme based on nonrelativistic effective field theories.
We include the effects of nonperturbative long-distance behaviors of the
potentials, while we determine the short-distance behaviors of the potentials
in perturbative QCD. We obtain $\overline{\rm MS}$-renormalized quarkonium
wavefunctions at the origin that have the correct scale dependences that are
expected from perturbative QCD, so that the scale dependences cancel in
physical quantities. Based on the calculation of the wavefunctions at the
origin, we make model-independent predictions of decay constants and
electromagnetic decay rates of $S$-wave charmonia and bottomonia, and compare
them with measurements. We find that the poor convergence of perturbative QCD
corrections are substantially improved when we include corrections to the
wavefunctions at the origin in the calculation of decay constants and decay
rates.
| [
{
"created": "Fri, 3 Jul 2020 14:57:14 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2020 12:57:31 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Dec 2020 20:50:33 GMT",
"version": "v3"
}
] | 2020-12-14 | [
[
"Chung",
"Hee Sok",
""
]
] | We compute $S$-wave quarkonium wavefunctions at the origin in the $\overline{\rm MS}$ scheme based on nonrelativistic effective field theories. We include the effects of nonperturbative long-distance behaviors of the potentials, while we determine the short-distance behaviors of the potentials in perturbative QCD. We obtain $\overline{\rm MS}$-renormalized quarkonium wavefunctions at the origin that have the correct scale dependences that are expected from perturbative QCD, so that the scale dependences cancel in physical quantities. Based on the calculation of the wavefunctions at the origin, we make model-independent predictions of decay constants and electromagnetic decay rates of $S$-wave charmonia and bottomonia, and compare them with measurements. We find that the poor convergence of perturbative QCD corrections are substantially improved when we include corrections to the wavefunctions at the origin in the calculation of decay constants and decay rates. |
2304.12578 | Kunio Kaneta | Kunio Kaneta, Kin-ya Oda | Non-thermal Higgs Spectrum in Reheating Epoch: Primordial Condensate vs.
Stochastic Fluctuation | 20 pages, 3 figures | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Since electroweak symmetry is generally broken during inflation, the Standard
Model Higgs field can become supermassive even after the end of inflation. In
this paper, we study the non-thermal phase space distribution of the Higgs
field during reheating, focusing in particular on two different contributions:
primordial condensate and stochastic fluctuations. We obtain their analytic
formulae, which agree with the previous numerical result. As a possible
consequence of the non-thermal Higgs spectrum, we discuss perturbative Higgs
decay during reheating for the case it is kinematically allowed. We find that
the soft-relativistic and hard spectra are dominant in the decay rate of the
stochastic fluctuation and that the primordial condensate and stochastic
fluctuations decay almost at the same time.
| [
{
"created": "Tue, 25 Apr 2023 05:07:12 GMT",
"version": "v1"
}
] | 2023-04-26 | [
[
"Kaneta",
"Kunio",
""
],
[
"Oda",
"Kin-ya",
""
]
] | Since electroweak symmetry is generally broken during inflation, the Standard Model Higgs field can become supermassive even after the end of inflation. In this paper, we study the non-thermal phase space distribution of the Higgs field during reheating, focusing in particular on two different contributions: primordial condensate and stochastic fluctuations. We obtain their analytic formulae, which agree with the previous numerical result. As a possible consequence of the non-thermal Higgs spectrum, we discuss perturbative Higgs decay during reheating for the case it is kinematically allowed. We find that the soft-relativistic and hard spectra are dominant in the decay rate of the stochastic fluctuation and that the primordial condensate and stochastic fluctuations decay almost at the same time. |
hep-ph/9303287 | null | Scott Dodelson and Lawrence M. Widrow | Sterile Neutrinos as Dark Matter | 10 pages (1 figure available upon request) phyzzx,
FERMILAB-Pub-93/057-A | Phys.Rev.Lett.72:17-20,1994 | 10.1103/PhysRevLett.72.17 | null | hep-ph astro-ph | null | The simplest model that can accomodate a viable nonbaryonic dark matter
candidate is the standard electroweak theory with the addition of right-handed
or sterile neutrinos. We reexamine this model and find that the sterile
neutrinos can be either hot, warm, or cold dark matter. Since their only direct
coupling is to left-handed or active neutrinos, the most efficient production
mechanism is via neutrino oscillations. If the production rate is always less
than the expansion rate, then these neutrinos will never be in thermal
equilibrium. However, enough of them may be produced so that they provide the
missing mass necessary for closure. We consider a single generation of neutrino
fields $\left (\nu_L,\,\nu_R\right )$ with a Dirac mass, $\mu$, and a Majorana
mass for the right-handed components only, $M$. For $M\gg \mu$ we show that the
number density of sterile neutrinos is proportional to $\mu^2/M$ so that the
energy density today is {\it independent of} $M$. However $M$ is crucial in
determining the large scale structure of the Universe. In particular, $M\simeq
0.1-1.0 {\rm ~keV}$ leads to warm dark matter and a structure formation
scenario that may have some advantages over both the standard hot and cold dark
matter scenarios.
| [
{
"created": "Mon, 22 Mar 1993 13:15:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dodelson",
"Scott",
""
],
[
"Widrow",
"Lawrence M.",
""
]
] | The simplest model that can accomodate a viable nonbaryonic dark matter candidate is the standard electroweak theory with the addition of right-handed or sterile neutrinos. We reexamine this model and find that the sterile neutrinos can be either hot, warm, or cold dark matter. Since their only direct coupling is to left-handed or active neutrinos, the most efficient production mechanism is via neutrino oscillations. If the production rate is always less than the expansion rate, then these neutrinos will never be in thermal equilibrium. However, enough of them may be produced so that they provide the missing mass necessary for closure. We consider a single generation of neutrino fields $\left (\nu_L,\,\nu_R\right )$ with a Dirac mass, $\mu$, and a Majorana mass for the right-handed components only, $M$. For $M\gg \mu$ we show that the number density of sterile neutrinos is proportional to $\mu^2/M$ so that the energy density today is {\it independent of} $M$. However $M$ is crucial in determining the large scale structure of the Universe. In particular, $M\simeq 0.1-1.0 {\rm ~keV}$ leads to warm dark matter and a structure formation scenario that may have some advantages over both the standard hot and cold dark matter scenarios. |
hep-ph/0005089 | Nikolai Uraltsev | Ikaros Bigi and Nikolai Uraltsev | D^0 - D^0-bar Oscillations as a Probe of Quark-Hadron Duality | 15 pages, LaTeX. Revised: A reference and a few clarifications in the
text are added. A few inconsistencies in equations are eliminated. We found
the standard contribution to Delta M_D to differ from the expression usually
quoted in the literature | Nucl.Phys. B592 (2001) 92-106 | 10.1016/S0550-3213(00)00604-0 | UND-HEP-00-BIG01 | hep-ph | null | It is usually argued that the Standard Model predicts slow D^0-\bar D^0
oscillations with \Delta M_D, \Delta \Gamma_D < 10^{-3}*\Gamma_D$ and that New
Physics can reveal itself through \Delta M_D exceeding 10^{-3}*\Gamma_D. It is
believed that the bulk of the effect is due to long distance dynamics that
cannot be described at the quark level. We point out that in general the OPE
yields soft GIM suppression scaling only like (m_s/\mu_{hadr})^2 and even like
m_s/\mu_{hadr} rather than m_s^4/m_c^4 of the simple quark box diagram. Such
contributions can actually yield \Delta M_D, \Delta \Gamma_D \sim
O(10^{-3})*\Gamma_D without invoking additional long distance effects. They are
reasonably suppressed as long as the OPE and local duality are qualitatively
applicable in the 1/m_c expansion. We stress the importance of improving the
sensitivity on \Delta \Gamma_D as well as \Delta M_D in a dedicated fashion as
a laboratory for analyzing the onset of quark-hadron duality and comment on the
recent preliminary study on \Delta \Gamma_D by the FOCUS group.
| [
{
"created": "Wed, 10 May 2000 09:06:04 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2000 07:18:51 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Bigi",
"Ikaros",
""
],
[
"Uraltsev",
"Nikolai",
""
]
] | It is usually argued that the Standard Model predicts slow D^0-\bar D^0 oscillations with \Delta M_D, \Delta \Gamma_D < 10^{-3}*\Gamma_D$ and that New Physics can reveal itself through \Delta M_D exceeding 10^{-3}*\Gamma_D. It is believed that the bulk of the effect is due to long distance dynamics that cannot be described at the quark level. We point out that in general the OPE yields soft GIM suppression scaling only like (m_s/\mu_{hadr})^2 and even like m_s/\mu_{hadr} rather than m_s^4/m_c^4 of the simple quark box diagram. Such contributions can actually yield \Delta M_D, \Delta \Gamma_D \sim O(10^{-3})*\Gamma_D without invoking additional long distance effects. They are reasonably suppressed as long as the OPE and local duality are qualitatively applicable in the 1/m_c expansion. We stress the importance of improving the sensitivity on \Delta \Gamma_D as well as \Delta M_D in a dedicated fashion as a laboratory for analyzing the onset of quark-hadron duality and comment on the recent preliminary study on \Delta \Gamma_D by the FOCUS group. |
2103.02054 | Craig Roberts | Chen Chen, Christian S. Fischer, Craig D. Roberts and Jorge Segovia | Nucleon axial-vector and pseudoscalar form factors, and PCAC relations | 27 pages, 13 figures, 1 table | null | 10.1103/PhysRevD.105.094022 | NJU-INP 028/20, USTC-ICTS/PCFT-22-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a continuum quark+diquark approach to the nucleon bound-state problem
in relativistic quantum field theory to deliver parameter-free predictions for
the nucleon axial and induced pseudoscalar form factors, $G_A$ and $G_P$, and
unify them with the pseudoscalar form factor $G_5$ or, equivalently, the
pion-nucleon form factor $G_{\pi NN}$. We explain how partial conservation of
the axial-vector current and the associated Goldberger-Treiman relation are
satisfied once all necessary couplings of the external current to the building
blocks of the nucleon are constructed consistently; in particular, we fully
resolve the seagull couplings to the diquark-quark vertices associated with the
axial-vector and pseudoscalar currents. Among the results we describe, the
following are worth highlighting. A dipole form factor defined by an axial
charge $g_A=G_A(0)=1.25(3)$ and a mass-scale $M_A = 1.23(3) m_N$, where $m_N$
is the nucleon mass, can accurately describe the pointwise behaviour of $G_A$.
Concerning $G_P$, we obtain the pseudoscalar charge $g_p^\ast = 8.80(23)$, and
find that the pion pole dominance approach delivers a reliable estimate of the
directly computed result. Our computed value of the pion-nucleon coupling
constant, $g_{\pi NN}/m_N =14.02(33)/{\rm GeV}$ is consistent with recent
precision determinations.
| [
{
"created": "Tue, 2 Mar 2021 22:09:43 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2021 06:29:20 GMT",
"version": "v2"
},
{
"created": "Sun, 3 Apr 2022 10:26:32 GMT",
"version": "v3"
}
] | 2022-06-01 | [
[
"Chen",
"Chen",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Roberts",
"Craig D.",
""
],
[
"Segovia",
"Jorge",
""
]
] | We use a continuum quark+diquark approach to the nucleon bound-state problem in relativistic quantum field theory to deliver parameter-free predictions for the nucleon axial and induced pseudoscalar form factors, $G_A$ and $G_P$, and unify them with the pseudoscalar form factor $G_5$ or, equivalently, the pion-nucleon form factor $G_{\pi NN}$. We explain how partial conservation of the axial-vector current and the associated Goldberger-Treiman relation are satisfied once all necessary couplings of the external current to the building blocks of the nucleon are constructed consistently; in particular, we fully resolve the seagull couplings to the diquark-quark vertices associated with the axial-vector and pseudoscalar currents. Among the results we describe, the following are worth highlighting. A dipole form factor defined by an axial charge $g_A=G_A(0)=1.25(3)$ and a mass-scale $M_A = 1.23(3) m_N$, where $m_N$ is the nucleon mass, can accurately describe the pointwise behaviour of $G_A$. Concerning $G_P$, we obtain the pseudoscalar charge $g_p^\ast = 8.80(23)$, and find that the pion pole dominance approach delivers a reliable estimate of the directly computed result. Our computed value of the pion-nucleon coupling constant, $g_{\pi NN}/m_N =14.02(33)/{\rm GeV}$ is consistent with recent precision determinations. |
1812.06903 | Xabier Feal | Xabier Feal | High energy scattering and emission in QED&QCD media | Some part of this work may overlap with arXiv:1811.01591 and
arXiv:1810.02645. Version 2: Corrected missprints in Eqs. 3.174, 3.190, 3.191
and 3.197, and updated references. Comments and corrections are welcome | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A formalism for the evaluation of the intensity of photon and gluon
bremsstrahlung in QED and QCD condensed media is presented which considers
general interactions beyond the Fokker-Planck/Gaussian approximation, the
angular distribution of the final particles and admits finite or structured
target calculations. The Boltzmann/transport approaches of Migdal, Bell and the
Baier-Dokshitzer-Mueller-Peign\'e-Schiff group, and the light-cone path
integral formalisms of Zakharov and Wiedemann and Gyulassy are recovered as
particular cases within the Fokker-Planck limit, which assumes Brownian motion
for the intervening particles. Weinberg's soft photon theorem is shown to
saturate the Landau-Pomeranchuk-Migdal supression in the soft photon/gluon
regime of vanishing phases. The intensity under realistic screened interactions
is larger than the existing Fokker-Planck results by a factor 3-4 and the
changes can not be accounted for by a single definition of the medium transport
properties through $\hat{q}$. This may also suggest that larger gluon elastic
cross sections, leading to the hypothesis of strongly coupled Quark Gluon
Plasma, may not be required to match the data.
| [
{
"created": "Mon, 17 Dec 2018 17:19:02 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Mar 2019 11:52:13 GMT",
"version": "v2"
}
] | 2019-03-19 | [
[
"Feal",
"Xabier",
""
]
] | A formalism for the evaluation of the intensity of photon and gluon bremsstrahlung in QED and QCD condensed media is presented which considers general interactions beyond the Fokker-Planck/Gaussian approximation, the angular distribution of the final particles and admits finite or structured target calculations. The Boltzmann/transport approaches of Migdal, Bell and the Baier-Dokshitzer-Mueller-Peign\'e-Schiff group, and the light-cone path integral formalisms of Zakharov and Wiedemann and Gyulassy are recovered as particular cases within the Fokker-Planck limit, which assumes Brownian motion for the intervening particles. Weinberg's soft photon theorem is shown to saturate the Landau-Pomeranchuk-Migdal supression in the soft photon/gluon regime of vanishing phases. The intensity under realistic screened interactions is larger than the existing Fokker-Planck results by a factor 3-4 and the changes can not be accounted for by a single definition of the medium transport properties through $\hat{q}$. This may also suggest that larger gluon elastic cross sections, leading to the hypothesis of strongly coupled Quark Gluon Plasma, may not be required to match the data. |
hep-ph/0206244 | Lee Carson Loveridge | Lee C. Loveridge | Nuclear Disintegration in Magnetic Fields | null | null | null | null | hep-ph | null | We employ the Weizsaecker-Williams method of virtual quanta to study
disintegration of nuclei in magnetic field. We explore a variety of field
configurations and conclude that for the energy range of interest for
applications to cosmic rays (10^{18}-10^{21} eV) such disintegrations are not a
significant source of energy or flux loss for any realistic acceleration
mechanism.
| [
{
"created": "Tue, 25 Jun 2002 01:03:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Loveridge",
"Lee C.",
""
]
] | We employ the Weizsaecker-Williams method of virtual quanta to study disintegration of nuclei in magnetic field. We explore a variety of field configurations and conclude that for the energy range of interest for applications to cosmic rays (10^{18}-10^{21} eV) such disintegrations are not a significant source of energy or flux loss for any realistic acceleration mechanism. |
hep-ph/9404288 | Department of theoretic physics | N.V.Mikheev and A.Ya.Parkhomenko | Double radiative decay $Z \rightarrow f\bar{f}\gamma\gamma$ in the
Standard Model | 6 pages, LaTeX, (the figures are not included), Yaroslavl, Yaroslavl
State University preprint YARU-HE-94/01 | Mod.Phys.Lett. A9 (1994) 1175-1182 | 10.1142/S0217732394000988 | null | hep-ph | null | Z-boson decay $Z \rightarrow f\tilde{f}\gamma\gamma$ in the Standard Model is
analysed. The distribution function on the invariant masses of the photon and
fermion pairs is calculated in the leading logarithmic approximation. It is
shown that this distribution function has a specific shape of a ``crest''. (To
be published in Mod.Phys.Lett.A)
| [
{
"created": "Tue, 19 Apr 1994 09:19:26 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mikheev",
"N. V.",
""
],
[
"Parkhomenko",
"A. Ya.",
""
]
] | Z-boson decay $Z \rightarrow f\tilde{f}\gamma\gamma$ in the Standard Model is analysed. The distribution function on the invariant masses of the photon and fermion pairs is calculated in the leading logarithmic approximation. It is shown that this distribution function has a specific shape of a ``crest''. (To be published in Mod.Phys.Lett.A) |
hep-ph/9907571 | Basim Kamal | Stephen Godfrey, Pat Kalyniak, Basim Kamal (Carleton U.) and Arnd
Leike (Munich U.) | Searching for a W' at the Next-Linear-Collider using Single Photons | 8 pages, 8 figures, Latex. To appear in proceedings of "MRST '99:
High Energy Physics at the Millenium", May 10-12, 1999, Carleton U., Ottawa
(AIP) | null | 10.1063/1.1301285 | null | hep-ph | null | We examine the sensitivity of the process e+e- -> nu nubar + gamma to
additional W-like bosons which arise in various models. The process is found to
be sensitive to W' masses up to several TeV.
| [
{
"created": "Fri, 30 Jul 1999 20:32:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Godfrey",
"Stephen",
"",
"Carleton U."
],
[
"Kalyniak",
"Pat",
"",
"Carleton U."
],
[
"Kamal",
"Basim",
"",
"Carleton U."
],
[
"Leike",
"Arnd",
"",
"Munich U."
]
] | We examine the sensitivity of the process e+e- -> nu nubar + gamma to additional W-like bosons which arise in various models. The process is found to be sensitive to W' masses up to several TeV. |
2103.07535 | Steven Dytman | Steven Dytman, Yoshinari Hayato, Roland Raboanary, Jan Sobczyk, Julia
Tena-Vidal, Narisoa Vololoniaina | Comparison of Validation Methods of Simulations for Final State
Interactions in Hadron Production Experiments | 21 pages, 18 figures | Phys. Rev. D 104, 053006 (2021) | 10.1103/PhysRevD.104.053006 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Neutrino cross section and oscillation measurements depend critically on
modeling of hadronic final state interactions (FSI). Often, this is one of the
largest components of uncertainty in a measurement. This is because of the
difficulty in modeling strong interactions in nuclei in a consistent
quantum-mechanical framework. FSI models are most often validated using
hadron-nucleus data which introduces further uncertainties. The alternative is
to use transparency data where the hadron starts propagating from inside the
nucleus and the probability of interaction is measured as a function of hadron
energy. This work examines the relationship between the $\pi^+$ and proton
total reaction cross section and transparency from a simulation viewpoint.
| [
{
"created": "Fri, 12 Mar 2021 21:24:27 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2021 18:28:30 GMT",
"version": "v2"
}
] | 2021-09-22 | [
[
"Dytman",
"Steven",
""
],
[
"Hayato",
"Yoshinari",
""
],
[
"Raboanary",
"Roland",
""
],
[
"Sobczyk",
"Jan",
""
],
[
"Tena-Vidal",
"Julia",
""
],
[
"Vololoniaina",
"Narisoa",
""
]
] | Neutrino cross section and oscillation measurements depend critically on modeling of hadronic final state interactions (FSI). Often, this is one of the largest components of uncertainty in a measurement. This is because of the difficulty in modeling strong interactions in nuclei in a consistent quantum-mechanical framework. FSI models are most often validated using hadron-nucleus data which introduces further uncertainties. The alternative is to use transparency data where the hadron starts propagating from inside the nucleus and the probability of interaction is measured as a function of hadron energy. This work examines the relationship between the $\pi^+$ and proton total reaction cross section and transparency from a simulation viewpoint. |
hep-ph/9806208 | Don Lichtenberg | D.B. Lichtenberg | Are there quasistable strange baryons with anticharm or antibeauty? | 7 pages, plaintex, no figures | J.Phys.G24:2065-2071,1998 | 10.1088/0954-3899/24/11/008 | IUHET--391 | hep-ph | null | In some models, exotic baryons with strangeness and anticharm or antibeauty
should exist and even be stable against strong decay. We consider the stability
of such possible exotic baryons, which in the constituent quark picture are
called pentaquarks (each is composed of four quarks and an antiquark). Our
model is based on diquark clustering and supersymmetry in hadrons, and assumes
that the spin-dependent force between quarks arises from one-gluon exchange. In
the model, a pentaquark with strangeness and anticharm can decay strongly, but
an analogous pentaquark with an antibeauty quark is stable except for weak
decay.
| [
{
"created": "Sun, 31 May 1998 20:23:33 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lichtenberg",
"D. B.",
""
]
] | In some models, exotic baryons with strangeness and anticharm or antibeauty should exist and even be stable against strong decay. We consider the stability of such possible exotic baryons, which in the constituent quark picture are called pentaquarks (each is composed of four quarks and an antiquark). Our model is based on diquark clustering and supersymmetry in hadrons, and assumes that the spin-dependent force between quarks arises from one-gluon exchange. In the model, a pentaquark with strangeness and anticharm can decay strongly, but an analogous pentaquark with an antibeauty quark is stable except for weak decay. |
hep-ph/9304316 | Lee Jaeyoung | A. Erdas, C. W. Kim and J. A. Lee | Fermion and Anti-Fermion Effective Masses in High Temperature Gauge
Theories in $CP$-Asymmetric Background | 13 pages, TIPAC-930010 | Phys.Rev.D48:3901-3905,1993 | 10.1103/PhysRevD.48.3901 | null | hep-ph | null | We calculate the splitting between fermion and anti-fermion effective masses
in high temperature gauge theories in the presence of a non-vanishing chemical
potential due to the $CP$-asymmetric fermionic background. In particular we
consider the case of left-handed leptons in the $SU(2)\otimes U(1)$ theory when
the temperature is above $250$ GeV and the gauge symmetry is restored.
| [
{
"created": "Thu, 29 Apr 1993 17:18:16 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Erdas",
"A.",
""
],
[
"Kim",
"C. W.",
""
],
[
"Lee",
"J. A.",
""
]
] | We calculate the splitting between fermion and anti-fermion effective masses in high temperature gauge theories in the presence of a non-vanishing chemical potential due to the $CP$-asymmetric fermionic background. In particular we consider the case of left-handed leptons in the $SU(2)\otimes U(1)$ theory when the temperature is above $250$ GeV and the gauge symmetry is restored. |
0904.4570 | Mikhail Vysotsky | V.A.Novikov, A.N.Rozanov, M.I.Vysotsky | Once more on extra quark-lepton generations and precision measurements | Dedicated to L.B. Okun's 80th birthday | Phys.Atom.Nucl.73:636-642,2010 | 10.1134/S1063778810040095 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision measurements of $Z$-boson parameters and $W$-boson and $t$-quark
masses put strong constraints on non $SU(2)\times U(1)$ singlet New Physics. We
demonstrate that one extra generation passes electroweak constraints even when
all new particle masses are well above their direct mass bounds.
| [
{
"created": "Wed, 29 Apr 2009 10:30:13 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Novikov",
"V. A.",
""
],
[
"Rozanov",
"A. N.",
""
],
[
"Vysotsky",
"M. I.",
""
]
] | Precision measurements of $Z$-boson parameters and $W$-boson and $t$-quark masses put strong constraints on non $SU(2)\times U(1)$ singlet New Physics. We demonstrate that one extra generation passes electroweak constraints even when all new particle masses are well above their direct mass bounds. |
hep-ph/9910232 | Josephine Bolosan | S. Pakvasa | CP Violation in Hyperon Decays | 15 pages, LATEX format, no figure | null | null | UH-511-942-99 | hep-ph hep-ex | null | The theory and phenomenology of CP violation in hyperon decays is summarized.
| [
{
"created": "Tue, 5 Oct 1999 00:43:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pakvasa",
"S.",
""
]
] | The theory and phenomenology of CP violation in hyperon decays is summarized. |
0801.4254 | Marco Ruggieri | H. Abuki, M. Ciminale, R.Gatto, N. D. Ippolito, G. Nardulli, M.
Ruggieri | Electrical neutrality and pion modes in the two flavor PNJL model | 8 pages, 8 figures, RevTeX4 style. One figure added, role of the bare
quark mass clarified, some reference added. To appear on Phys. Rev. D | Phys.Rev.D78:014002,2008 | 10.1103/PhysRevD.78.014002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phase diagram and the pion modes in the electrically neutral two
flavor PNJL model. One of the main result of this paper is that when electrical
neutrality is required, pions do not condense in the ground state of the model:
the isospin chemical potential $\mu_I = -\mu_e/2$ is always smaller than the
value required for pion condensation to occur. Moreover we investigate on the
pions and $\sigma$ mass spectra. We find that the qualitative behavior of the
masses resembles that obtained in the NJL model. We close this paper by
studying the intriguing possibility that a bound state with the quantum numbers
of the pions can be formed above the chiral phase transition.
| [
{
"created": "Mon, 28 Jan 2008 14:43:10 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2008 18:08:45 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jun 2008 11:37:11 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Abuki",
"H.",
""
],
[
"Ciminale",
"M.",
""
],
[
"Gatto",
"R.",
""
],
[
"Ippolito",
"N. D.",
""
],
[
"Nardulli",
"G.",
""
],
[
"Ruggieri",
"M.",
""
]
] | We study the phase diagram and the pion modes in the electrically neutral two flavor PNJL model. One of the main result of this paper is that when electrical neutrality is required, pions do not condense in the ground state of the model: the isospin chemical potential $\mu_I = -\mu_e/2$ is always smaller than the value required for pion condensation to occur. Moreover we investigate on the pions and $\sigma$ mass spectra. We find that the qualitative behavior of the masses resembles that obtained in the NJL model. We close this paper by studying the intriguing possibility that a bound state with the quantum numbers of the pions can be formed above the chiral phase transition. |
1502.04862 | Eef van Beveren | Eef van Beveren, George Rupp and Susana Coito | Unquenching weak substructure | Presented at Workshop on Unquenched Hadron Spectroscopy:
Non-Perturbative Models and Methods of QCD vs. Experiment, Coimbra
(Portugal), 1-5 September 2014. 8 pages, 1 figure, plain LaTeX | Acta Phys. Polon. B Proc. Supp. 8 (2015) 145 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On assuming that Weak substructure has a dynamics which is similar to quantum
chromodynamics but much stronger, we conclude that unquenching is indispensable
for predictions on the spectrum of Weak-substructure resonances.
| [
{
"created": "Tue, 17 Feb 2015 11:16:55 GMT",
"version": "v1"
}
] | 2017-12-19 | [
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
],
[
"Coito",
"Susana",
""
]
] | On assuming that Weak substructure has a dynamics which is similar to quantum chromodynamics but much stronger, we conclude that unquenching is indispensable for predictions on the spectrum of Weak-substructure resonances. |
hep-ph/0403084 | Fritz W. Bopp | F.W.Bopp, J. Ranft, R.Engel, and S.Roesler | RHIC data and the multichain Monte Carlo DPMJET-II | 8 pages, Based on a poster submitted to the 17th International
Conference on Ultra Relativistic Nucleus Nucleus Collisions, Jan. 11-17,
Oakland,California USA | null | null | SI-HEP-2004-05 | hep-ph | null | Using data from RHIC we are able to systematically improve the two-component
Dual Parton Model (DPM) event generator DPMJET-III. Introducing percolation
parametrized as fusion of chains the model describes multiplicities and
pseudorapidity distributions in nucleus-nucleus collisions at all centralities.
Guided by the d-Au data from RHIC we recalibrate the model to obtain collision
scaling in h-A and d-A collisions.
| [
{
"created": "Mon, 8 Mar 2004 15:50:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bopp",
"F. W.",
""
],
[
"Ranft",
"J.",
""
],
[
"Engel",
"R.",
""
],
[
"Roesler",
"S.",
""
]
] | Using data from RHIC we are able to systematically improve the two-component Dual Parton Model (DPM) event generator DPMJET-III. Introducing percolation parametrized as fusion of chains the model describes multiplicities and pseudorapidity distributions in nucleus-nucleus collisions at all centralities. Guided by the d-Au data from RHIC we recalibrate the model to obtain collision scaling in h-A and d-A collisions. |
hep-ph/0001310 | Amol Dighe | K. R. S. Balaji (IMSc), Amol S. Dighe (CERN), R. N. Mohapatra (U. of
Maryland), M. K. Parida (NEHU) | Generation of large flavor mixing from radiative corrections | 14 pages RevTeX, 2 eps figures. Minor changes made, a few references
added | Phys.Rev.Lett. 84 (2000) 5034-5037 | 10.1103/PhysRevLett.84.5034 | CERN-TH/2000-026, IMSc/2000/01/01, UMD-PP-00-053 | hep-ph | null | We provide a model independent criterion which would guarantee a large flavor
mixing of two quasi-degenerate Majorana neutrinos at the low scale,
irrespective of the mixing at the high scale. We also show that such a
situation is realizable for a phenomenologically interesting range of
parameters of the weak scale theory. We further show that for a similar
condition to be implementable for the three generation case, the CP parity of
one of the neutrinos needs to be opposite to that of the others.
| [
{
"created": "Sat, 29 Jan 2000 17:30:41 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Feb 2000 18:37:35 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Balaji",
"K. R. S.",
"",
"IMSc"
],
[
"Dighe",
"Amol S.",
"",
"CERN"
],
[
"Mohapatra",
"R. N.",
"",
"U. of\n Maryland"
],
[
"Parida",
"M. K.",
"",
"NEHU"
]
] | We provide a model independent criterion which would guarantee a large flavor mixing of two quasi-degenerate Majorana neutrinos at the low scale, irrespective of the mixing at the high scale. We also show that such a situation is realizable for a phenomenologically interesting range of parameters of the weak scale theory. We further show that for a similar condition to be implementable for the three generation case, the CP parity of one of the neutrinos needs to be opposite to that of the others. |
1210.7921 | Seung-il Nam | Seung-il Nam | Electrical conductivity of quark matter at finite T | 5 pages, 2 figures, Talk given at the International Conference "Xth
Quark Confinement and the Hadron Spectrum" (Confinement 10), 8~12 October
2012, TUM Campus Garching, Munich, Germany | null | null | KIAS-P12071 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I present the recent theoretical results on the electrical
conductivity (EC) sigma of quark matter, using the Kubo formula at finite
temperature and zero quark density (T>0, mu=0) in the presence of an external
strong magnetic field. The dilute instanton-liquid model with the caloron
distribution is taken into account. It turns out that sigma=(0.02~0.15)/fm for
T=(0~400) MeV with the relaxation time tau=(0.3~0.9) fm. EC is parameterized as
sigma/T (0.46,0.77,1.08,1.39)C_EM for tau=(0.3,0.5,0.7,0.9) fm, respectively.
These results are well compatible with other theoretical estimations and show
almost negligible effects from the magnetic field. The soft photon emission
rate from the quark-gluon plasma is discussed as well.
| [
{
"created": "Tue, 30 Oct 2012 08:02:37 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2012 10:29:13 GMT",
"version": "v2"
}
] | 2012-11-02 | [
[
"Nam",
"Seung-il",
""
]
] | In this talk, I present the recent theoretical results on the electrical conductivity (EC) sigma of quark matter, using the Kubo formula at finite temperature and zero quark density (T>0, mu=0) in the presence of an external strong magnetic field. The dilute instanton-liquid model with the caloron distribution is taken into account. It turns out that sigma=(0.02~0.15)/fm for T=(0~400) MeV with the relaxation time tau=(0.3~0.9) fm. EC is parameterized as sigma/T (0.46,0.77,1.08,1.39)C_EM for tau=(0.3,0.5,0.7,0.9) fm, respectively. These results are well compatible with other theoretical estimations and show almost negligible effects from the magnetic field. The soft photon emission rate from the quark-gluon plasma is discussed as well. |
hep-ph/0403108 | Oswald Michaela | Dmitri Diakonov and Michaela Oswald | Gauge invariant effective action for the Polyakov line in the SU(N)
Yang--Mills theory at high temperatures | RevTex4, 2 figures | Phys.Rev. D70 (2004) 105016 | 10.1103/PhysRevD.70.105016 | null | hep-ph hep-lat hep-th | null | We integrate out fast varying quantum fluctuations around static A_4 and A_i
fields for the SU(N) gauge group. By assuming that the gluon fields are slowly
varying but allowing for an arbitrary amplitude of A_4 we obtain two variants
of the effective high-temperature theory for the Polyakov line. One is the
effective action for the gauge-invariant eigenvalues of the Polyakov line, and
it is explicitly Z(N) symmetric. The other is the effective action for the
Polyakov line itself as an element of the SU(N). In this case the theory
necessarily includes the spatial components A_i to ensure its gauge invariance
under spatial gauge transformations. We derive the 1-loop effective action in
the `electric' and `magnetic' sectors, summing up all powers of A_4.
| [
{
"created": "Wed, 10 Mar 2004 10:37:44 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 2004 14:47:49 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Diakonov",
"Dmitri",
""
],
[
"Oswald",
"Michaela",
""
]
] | We integrate out fast varying quantum fluctuations around static A_4 and A_i fields for the SU(N) gauge group. By assuming that the gluon fields are slowly varying but allowing for an arbitrary amplitude of A_4 we obtain two variants of the effective high-temperature theory for the Polyakov line. One is the effective action for the gauge-invariant eigenvalues of the Polyakov line, and it is explicitly Z(N) symmetric. The other is the effective action for the Polyakov line itself as an element of the SU(N). In this case the theory necessarily includes the spatial components A_i to ensure its gauge invariance under spatial gauge transformations. We derive the 1-loop effective action in the `electric' and `magnetic' sectors, summing up all powers of A_4. |
0807.1926 | Frank Tackmann | Zoltan Ligeti, Iain W. Stewart, Frank J. Tackmann | Treating the b quark distribution function with reliable uncertainties | 26 pages, 14 figures, v2: minor changes, refs added, v3: journal
version | Phys.Rev.D78:114014,2008 | 10.1103/PhysRevD.78.114014 | MIT-CTP 3955 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parton distribution function for a b quark in the B meson (called the
shape function) plays an important role in the analysis of the B -> X_s gamma
and B -> X_u l nu data, and gives one of the dominant uncertainties in the
determination of |Vub|. We introduce a new framework to treat the shape
function, which consistently incorporates its renormalization group evolution
and all constraints on its shape and moments in any short distance mass scheme.
At the same time it allows a reliable treatment of the uncertainties. We
develop an expansion in a suitable complete set of orthonormal basis functions,
which provides a procedure for systematically controlling the uncertainties due
to the unknown functional form of the shape function. This is a significant
improvement over fits to model functions. Given any model for the shape
function, our construction gives an orthonormal basis in which the model occurs
as the first term, and corrections to it can be studied. We introduce a new
short distance scheme, the "invisible scheme", for the kinetic energy matrix
element, lambda_1. We obtain closed form results for the differential rates
that incorporate perturbative corrections and a summations of logarithms at any
order in perturbation theory, and present results using known
next-to-next-to-leading order expressions. The experimental implementation of
our framework is straightforward.
| [
{
"created": "Mon, 14 Jul 2008 19:53:41 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2008 21:00:45 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Dec 2008 04:55:08 GMT",
"version": "v3"
}
] | 2008-12-30 | [
[
"Ligeti",
"Zoltan",
""
],
[
"Stewart",
"Iain W.",
""
],
[
"Tackmann",
"Frank J.",
""
]
] | The parton distribution function for a b quark in the B meson (called the shape function) plays an important role in the analysis of the B -> X_s gamma and B -> X_u l nu data, and gives one of the dominant uncertainties in the determination of |Vub|. We introduce a new framework to treat the shape function, which consistently incorporates its renormalization group evolution and all constraints on its shape and moments in any short distance mass scheme. At the same time it allows a reliable treatment of the uncertainties. We develop an expansion in a suitable complete set of orthonormal basis functions, which provides a procedure for systematically controlling the uncertainties due to the unknown functional form of the shape function. This is a significant improvement over fits to model functions. Given any model for the shape function, our construction gives an orthonormal basis in which the model occurs as the first term, and corrections to it can be studied. We introduce a new short distance scheme, the "invisible scheme", for the kinetic energy matrix element, lambda_1. We obtain closed form results for the differential rates that incorporate perturbative corrections and a summations of logarithms at any order in perturbation theory, and present results using known next-to-next-to-leading order expressions. The experimental implementation of our framework is straightforward. |
0912.5256 | Harleen Dahiya Dr. | Harleen Dahiya, Neetika Sharma and P.K. Chatley | Magnetic moments of spin {1/2}^+ and spin {3/2}^+ charmed baryons | 5 pages, 2 tables. Presented at the XIII International Conference on
Hadron Spectroscopy, Florida State University, Florida, USA, November
29-December 4, 2009 | AIP Conf. Proc. 1257:395-399,2010 | 10.1063/1.3483357 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The magnetic moments of spin ${1/2}{^+}$ and spin ${3/2}{^+}$ charmed baryons
have been calculated in chiral constituent quark model ($\chi$CQM). The effects
of configuration mixing and quark masses have also been investigated. The
results are not only in good agreement with existing experimental data but also
show improvement over other phenomenological models.
| [
{
"created": "Tue, 29 Dec 2009 05:28:13 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Dahiya",
"Harleen",
""
],
[
"Sharma",
"Neetika",
""
],
[
"Chatley",
"P. K.",
""
]
] | The magnetic moments of spin ${1/2}{^+}$ and spin ${3/2}{^+}$ charmed baryons have been calculated in chiral constituent quark model ($\chi$CQM). The effects of configuration mixing and quark masses have also been investigated. The results are not only in good agreement with existing experimental data but also show improvement over other phenomenological models. |
hep-ph/9602311 | Roman Jackiw | Roman Jackiw | Screening in High-T QCD | Latex with built-in postscript figures, 22 pages | null | null | MIT-CTP-2513 | hep-ph hep-th | null | These days, as high energy particle colliders become unavailable for testing
speculative theoretical ideas, physicists are looking to other environments
that may provide extreme conditions where theory confronts physical reality.
One such circumstance may arise at high temperature $T$, which perhaps can be
attained in heavy ion collisions or in astrophysical settings. It is natural
therefore to examine the high-temperature behavior of the standard model, and
here I shall report on recent progress in constructing the high-$T$ limit
of~QCD.
| [
{
"created": "Wed, 14 Feb 1996 18:01:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jackiw",
"Roman",
""
]
] | These days, as high energy particle colliders become unavailable for testing speculative theoretical ideas, physicists are looking to other environments that may provide extreme conditions where theory confronts physical reality. One such circumstance may arise at high temperature $T$, which perhaps can be attained in heavy ion collisions or in astrophysical settings. It is natural therefore to examine the high-temperature behavior of the standard model, and here I shall report on recent progress in constructing the high-$T$ limit of~QCD. |
1105.1507 | Torsten Pfoh | Florian Goertz and Torsten Pfoh | Randall-Sundrum Corrections to the Width Difference and CP-Violating
Phase in $B^0_s$-Meson Decays | 12 pages, 1 table, 3 figures, references added, comments added, minor
correction in numerics, conclusions unchanged, accepted for publication in
Physical Review D | null | 10.1103/PhysRevD.84.095016 | MZ-TH/11-05 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of the Randall-Sundrum setup on the width difference
$\Delta\Gamma_s$ and the CP-violating phase $\phi_s$ in the $\bar
B_s^0$-$B_s^0$ system. Our calculations are performed in the general framework
of an effective theory, based on operator product expansion. The result can
thus be used for many new physics models. We find that the correction to the
magnitude of the decay amplitude $\Gamma_{12}$ is below 4% for a realistic
choice of input parameters. The main modification in the
$\Delta\Gamma_s/\beta_s$-plane is caused by a new CP-violating phase in the
mixing amplitude, which allows for a better agreement with the experimental
results of CDF and D\O from $B_s^0\rightarrow J/\psi\phi\,$ decays. The
best-fit value of the CP asymmetry $S_{\psi\phi}$ can be reproduced, while
simultaneously the theoretical prediction for the semileptonic CP asymmetry
$A_{\rm SL}^s$ can enter the $1\sigma$ range.
| [
{
"created": "Sun, 8 May 2011 12:26:55 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Sep 2011 09:55:55 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Goertz",
"Florian",
""
],
[
"Pfoh",
"Torsten",
""
]
] | We study the impact of the Randall-Sundrum setup on the width difference $\Delta\Gamma_s$ and the CP-violating phase $\phi_s$ in the $\bar B_s^0$-$B_s^0$ system. Our calculations are performed in the general framework of an effective theory, based on operator product expansion. The result can thus be used for many new physics models. We find that the correction to the magnitude of the decay amplitude $\Gamma_{12}$ is below 4% for a realistic choice of input parameters. The main modification in the $\Delta\Gamma_s/\beta_s$-plane is caused by a new CP-violating phase in the mixing amplitude, which allows for a better agreement with the experimental results of CDF and D\O from $B_s^0\rightarrow J/\psi\phi\,$ decays. The best-fit value of the CP asymmetry $S_{\psi\phi}$ can be reproduced, while simultaneously the theoretical prediction for the semileptonic CP asymmetry $A_{\rm SL}^s$ can enter the $1\sigma$ range. |
hep-ph/9401287 | Jicai Pan | Rudolph C. Hwa, C.S. Lam, and Jicai Pan | Cluster Production in Quark-Hadron Phase Transition | 12 pages + 1 figure. Report # OITS-517. To be published in Phys. Rev.
Lett. 71, xxx (1994) | Phys.Rev.Lett. 72 (1994) 820-823 | 10.1103/PhysRevLett.72.820 | null | hep-ph nucl-th | null | The problem of cluster formation and growth in first-order quark-hadron phase
transition in heavy-ion collisions is considered. Behaving as Brownian
particles, the clusters carry out random walks and can encounter one another,
leading to coalescence and breakup. A simulation of the process in cellular
automaton suggests the possibility of a scaling distribution in the cluster
sizes. The experimental determination of the cluster-size distribution is urged
as a means to find a clear signature of phase transition.
| [
{
"created": "Wed, 19 Jan 1994 17:55:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Hwa",
"Rudolph C.",
""
],
[
"Lam",
"C. S.",
""
],
[
"Pan",
"Jicai",
""
]
] | The problem of cluster formation and growth in first-order quark-hadron phase transition in heavy-ion collisions is considered. Behaving as Brownian particles, the clusters carry out random walks and can encounter one another, leading to coalescence and breakup. A simulation of the process in cellular automaton suggests the possibility of a scaling distribution in the cluster sizes. The experimental determination of the cluster-size distribution is urged as a means to find a clear signature of phase transition. |
1404.6705 | Wenyu Wang | Fei Wang, Wenyu Wang, Jin Min Yang, Sihong Zhou | Singlet extension of the MSSM as a solution to the small cosmological
scale anomalies | 23 pages, 12 figures. minor changes, reference added, accepted for
publication in PRD | Phys. Rev. D 90, 035028 (2014) | 10.1103/PhysRevD.90.035028 | null | hep-ph astro-ph.CO astro-ph.GA | http://creativecommons.org/licenses/by/3.0/ | In this work we show that the general singlet extension of the MSSM can
naturally provide a self-interacting singlino dark matter to solve the small
cosmological scale anomalies (a large Sommerfeld enhancement factor can also be
obtained). However, we find that the NMSSM (the singlet extension of the MSSM
with Z3 symmetry) cannot achieve this due to the restricted parameter space. In
our analysis we introduce the concept of symmetric and antisymmetric viscosity
cross sections to deal with the non-relativistic Majorana-fermion dark matter
scattering.
| [
{
"created": "Sun, 27 Apr 2014 03:35:13 GMT",
"version": "v1"
},
{
"created": "Sun, 4 May 2014 02:33:00 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Aug 2014 05:44:18 GMT",
"version": "v3"
}
] | 2014-09-05 | [
[
"Wang",
"Fei",
""
],
[
"Wang",
"Wenyu",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhou",
"Sihong",
""
]
] | In this work we show that the general singlet extension of the MSSM can naturally provide a self-interacting singlino dark matter to solve the small cosmological scale anomalies (a large Sommerfeld enhancement factor can also be obtained). However, we find that the NMSSM (the singlet extension of the MSSM with Z3 symmetry) cannot achieve this due to the restricted parameter space. In our analysis we introduce the concept of symmetric and antisymmetric viscosity cross sections to deal with the non-relativistic Majorana-fermion dark matter scattering. |
2309.02246 | Gioacchino Piazza | Lukas Allwicher, Damir Becirevic, Gioacchino Piazza, Salvador
Rosauro-Alcaraz, Olcyr Sumensari | Understanding the first measurement of $\mathcal{B}(B\to K \nu
\bar{\nu})$ | 9 pages, 6 figures. Corrected some typos and improved the discussion | null | 10.1016/j.physletb.2023.138411 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recently, Belle II reported on the first measurement of $\mathcal{B}(B^\pm\to
K^\pm \nu\bar{\nu})$ which appears to be almost $3\sigma$ larger than predicted
in the Standard Model. We point out the important correlation with
$\mathcal{B}(B\to K^{\ast} \nu\bar{\nu})$ so that the measurement of that decay
mode could help restraining the possible options for building the model of New
Physics. We then try to interpret this new experimental result in terms of
physics beyond the Standard Model by using SMEFT and find that a scenario with
coupling only to $\tau$ can accommodate the current experimental constraints
but fails in getting a desired $R_{D^{(\ast )}}^\mathrm{exp}/R_{D^{(\ast
)}}^\mathrm{SM}$, unless one turns the other SMEFT operators that are not
related to $b\to s\ell\ell$ or/and $b\to s\nu\nu$.
| [
{
"created": "Tue, 5 Sep 2023 13:54:29 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2023 12:56:18 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jan 2024 14:17:25 GMT",
"version": "v3"
}
] | 2024-01-03 | [
[
"Allwicher",
"Lukas",
""
],
[
"Becirevic",
"Damir",
""
],
[
"Piazza",
"Gioacchino",
""
],
[
"Rosauro-Alcaraz",
"Salvador",
""
],
[
"Sumensari",
"Olcyr",
""
]
] | Recently, Belle II reported on the first measurement of $\mathcal{B}(B^\pm\to K^\pm \nu\bar{\nu})$ which appears to be almost $3\sigma$ larger than predicted in the Standard Model. We point out the important correlation with $\mathcal{B}(B\to K^{\ast} \nu\bar{\nu})$ so that the measurement of that decay mode could help restraining the possible options for building the model of New Physics. We then try to interpret this new experimental result in terms of physics beyond the Standard Model by using SMEFT and find that a scenario with coupling only to $\tau$ can accommodate the current experimental constraints but fails in getting a desired $R_{D^{(\ast )}}^\mathrm{exp}/R_{D^{(\ast )}}^\mathrm{SM}$, unless one turns the other SMEFT operators that are not related to $b\to s\ell\ell$ or/and $b\to s\nu\nu$. |
hep-ph/9408359 | null | Jonathan L. Feng and Matthew J. Strassler | Determination of Fundamental Supersymmetry Parameters from Chargino
Production at Lepii | 52pp, Revtex, 30 figures available upon request, SLAC-PUB-6497,
RU-94-67 (text and figures available in ps form by anonymous ftp from
preprint.slac.stanford.edu, directory pub/preprints/hep-ph/9408) | Phys.Rev.D51:4661-4694,1995 | 10.1103/PhysRevD.51.4661 | null | hep-ph | null | If accessible at LEP II, chargino production is likely to be one of the few
available supersymmetric signals for many years. We consider the prospects for
the determination of fundamental supersymmetry parameters in such a scenario.
The study is complicated by the dependence of observables on a large number of
these parameters. We propose a straightforward procedure for disentangling
these dependences and demonstrate its effectiveness by presenting a number of
case studies at representative points in parameter space. Working in the
context of the minimal supersymmetric standard model, we find that chargino
production by itself is a fairly sensitive probe of the supersymmetry-breaking
sector. For significant regions of parameter space, it is possible to test the
gaugino mass unification hypothesis and to measure the gaugino contents of the
charginos and neutralinos, thereby testing the predictions of grand unification
and the viability of the lightest supersymmetric particle as a dark matter
candidate. For much of the parameter space, it is also possible to set limits
on the mass of the electron sneutrino, which provide a valuable guide for
future particle searches.
| [
{
"created": "Wed, 24 Aug 1994 10:44:00 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Feng",
"Jonathan L.",
""
],
[
"Strassler",
"Matthew J.",
""
]
] | If accessible at LEP II, chargino production is likely to be one of the few available supersymmetric signals for many years. We consider the prospects for the determination of fundamental supersymmetry parameters in such a scenario. The study is complicated by the dependence of observables on a large number of these parameters. We propose a straightforward procedure for disentangling these dependences and demonstrate its effectiveness by presenting a number of case studies at representative points in parameter space. Working in the context of the minimal supersymmetric standard model, we find that chargino production by itself is a fairly sensitive probe of the supersymmetry-breaking sector. For significant regions of parameter space, it is possible to test the gaugino mass unification hypothesis and to measure the gaugino contents of the charginos and neutralinos, thereby testing the predictions of grand unification and the viability of the lightest supersymmetric particle as a dark matter candidate. For much of the parameter space, it is also possible to set limits on the mass of the electron sneutrino, which provide a valuable guide for future particle searches. |
1706.07686 | Vincent Cheung | Vincent Cheung, Ramona Vogt | Polarization of prompt $J/\psi$ and $\Upsilon$(1S) production in the
color evaporation model | arXiv admin note: substantial text overlap with arXiv:1702.07809 | null | 10.1103/PhysRevD.96.054014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the polarization of prompt $J/\psi$ and $\Upsilon$(1S)
production using the color evaporation model at leading order. We present the
polarization parameter $\lambda_\vartheta$ as a function of center of mass
energy and rapidity in $p+p$ collisions. We also compare the $x_F$ dependence
to experimental results in $p$+Cu and $\pi$+W collisions, and predict the $x_F$
dependence in $p$+Pb collisions at fixed-target energies. At energies far above
the $Q\overline{Q}$ production threshold, we find the prompt $J/\psi$ and
$\Upsilon$(1S) production to be longitudinally polarized with
$\lambda_\vartheta^{J/\psi}=-0.51^{+0.05}_{-0.16}$ and
$\lambda_\vartheta^{\Upsilon \rm{(1S)}}=-0.69^{+0.03}_{-0.02}$. Both prompt
$J/\psi$ and prompt $\Upsilon$(1S) are also longitudinally polarized at central
rapidity, becoming transversely polarized at the most forward rapidities.
| [
{
"created": "Thu, 22 Jun 2017 17:45:13 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Cheung",
"Vincent",
""
],
[
"Vogt",
"Ramona",
""
]
] | We calculate the polarization of prompt $J/\psi$ and $\Upsilon$(1S) production using the color evaporation model at leading order. We present the polarization parameter $\lambda_\vartheta$ as a function of center of mass energy and rapidity in $p+p$ collisions. We also compare the $x_F$ dependence to experimental results in $p$+Cu and $\pi$+W collisions, and predict the $x_F$ dependence in $p$+Pb collisions at fixed-target energies. At energies far above the $Q\overline{Q}$ production threshold, we find the prompt $J/\psi$ and $\Upsilon$(1S) production to be longitudinally polarized with $\lambda_\vartheta^{J/\psi}=-0.51^{+0.05}_{-0.16}$ and $\lambda_\vartheta^{\Upsilon \rm{(1S)}}=-0.69^{+0.03}_{-0.02}$. Both prompt $J/\psi$ and prompt $\Upsilon$(1S) are also longitudinally polarized at central rapidity, becoming transversely polarized at the most forward rapidities. |
1304.2143 | Sasa Prelovsek | S. Prelovsek, C. B. Lang, L. Leskovec, D. Mohler and R. M. Woloshyn | Hadronic Resonances in Lattice QCD | 6 pages, proceedings for invited talk at Exited QCD 2013, 3-9
February 2013, Bjelasnica, Sarajevo | null | null | FERMILAB-CONF-13-089-T | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss how masses and widths of hadron resonances are extracted from
lattice QCD. Recent lattice results on the light, strange and charm meson
resonances are reviewed. Their properties are revealed by simulating the
corresponding scattering channels pi-pi, K-pi and D-pi on the lattice and
extracting the scattering phase shifts. In particular we address the resonances
rho, D0*(2400), D1(2430), K*, kappa and K0*(1430).
| [
{
"created": "Mon, 8 Apr 2013 09:35:09 GMT",
"version": "v1"
}
] | 2013-04-09 | [
[
"Prelovsek",
"S.",
""
],
[
"Lang",
"C. B.",
""
],
[
"Leskovec",
"L.",
""
],
[
"Mohler",
"D.",
""
],
[
"Woloshyn",
"R. M.",
""
]
] | I discuss how masses and widths of hadron resonances are extracted from lattice QCD. Recent lattice results on the light, strange and charm meson resonances are reviewed. Their properties are revealed by simulating the corresponding scattering channels pi-pi, K-pi and D-pi on the lattice and extracting the scattering phase shifts. In particular we address the resonances rho, D0*(2400), D1(2430), K*, kappa and K0*(1430). |
1809.04504 | Vicente Vento | Vicente Vento | Ion scattering on monopoles | 4pages, 4 figures, work presented in the 7th International Conference
on New Frontiers in Physics (ICNFP 2018) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Magnetic monopoles have been a subject of interest since Dirac established
the relation between the existence of monopoles and charge quantization. The
Dirac quantization condition bestows the monopole with a huge magnetic charge.
We study the scattering of charged ions by monopoles and use backscattering
techniques to devise a method to detect monopoles bound in matter.
| [
{
"created": "Wed, 12 Sep 2018 15:03:14 GMT",
"version": "v1"
}
] | 2018-09-13 | [
[
"Vento",
"Vicente",
""
]
] | Magnetic monopoles have been a subject of interest since Dirac established the relation between the existence of monopoles and charge quantization. The Dirac quantization condition bestows the monopole with a huge magnetic charge. We study the scattering of charged ions by monopoles and use backscattering techniques to devise a method to detect monopoles bound in matter. |
0903.3396 | Brian Batell | Brian Batell, Maxim Pospelov, Adam Ritz | Direct Detection of Multi-component Secluded WIMPs | 23 pages, 6 figures | Phys.Rev.D79:115019,2009 | 10.1103/PhysRevD.79.115019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter candidates comprising several sub-states separated by a small
mass gap, and coupled to the Standard Model by (sub-)GeV force carriers, can
exhibit non-trivial scattering interactions in direct detection experiments. We
analyze the secluded U(1)-mediated WIMP scenario, and calculate the elastic and
inelastic cross sections for multi-component WIMP scattering off nuclei. We
find that second-order elastic scattering, mediated by virtual excited states,
provides strong sensitivity to the parameters of the model for a wide range of
mass splittings, while for small splittings the WIMP excited states have
lifetimes exceeding the age of the universe, and generically have a fractional
relative abundance above 0.1%. This generates even stronger constraints for
mass splittings less than 200 keV due to exothermic de-excitation events in
detectors.
| [
{
"created": "Thu, 19 Mar 2009 19:32:38 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Batell",
"Brian",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Ritz",
"Adam",
""
]
] | Dark matter candidates comprising several sub-states separated by a small mass gap, and coupled to the Standard Model by (sub-)GeV force carriers, can exhibit non-trivial scattering interactions in direct detection experiments. We analyze the secluded U(1)-mediated WIMP scenario, and calculate the elastic and inelastic cross sections for multi-component WIMP scattering off nuclei. We find that second-order elastic scattering, mediated by virtual excited states, provides strong sensitivity to the parameters of the model for a wide range of mass splittings, while for small splittings the WIMP excited states have lifetimes exceeding the age of the universe, and generically have a fractional relative abundance above 0.1%. This generates even stronger constraints for mass splittings less than 200 keV due to exothermic de-excitation events in detectors. |
hep-ph/0102199 | Subhendu Rakshit | Debajyoti Choudhury, Biswarup Mukhopadhyaya and Subhendu Rakshit | Muon anomalous magnetic moment confronts exotic fermions and gauge
bosons | Additional figures included, minor modifications made in the text | Phys.Lett. B507 (2001) 219-223 | 10.1016/S0370-2693(01)00440-3 | MRI-P-010302 | hep-ph | null | We investigate the status of models containing exotic fermions or extra
Z-like neutral gauge bosons in the light of the recent data on anomalous
magnetic moment of muon. We find that it is possible to extract interesting
bounds on the parameters characterizing such models. The bounds are
particularly strong if the new flavour-changing neutral currents are axial
vectorlike.
| [
{
"created": "Thu, 15 Feb 2001 22:42:51 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Mar 2001 11:39:25 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Rakshit",
"Subhendu",
""
]
] | We investigate the status of models containing exotic fermions or extra Z-like neutral gauge bosons in the light of the recent data on anomalous magnetic moment of muon. We find that it is possible to extract interesting bounds on the parameters characterizing such models. The bounds are particularly strong if the new flavour-changing neutral currents are axial vectorlike. |
0709.1775 | Fredrick Olness | Ingo Schienbein, Voica A. Radescu, G.P. Zeller, M. Eric Christy, C.E.
Keppel, Kevin S. McFarland, W. Melnitchouk, Fredrick I. Olness, Mary Hall
Reno, Fernando Steffens, Ji-Young Yu | A Review of Target Mass Corrections | 41 pages, 13 figures; minor updates to match published version | J.Phys.G35:053101,2008 | 10.1088/0954-3899/35/5/053101 | JLAB-THY-07-718 | hep-ph | null | With recent advances in the precision of inclusive lepton--nuclear scattering
experiments, it has become apparent that comparable improvements are needed in
the accuracy of the theoretical analysis tools. In particular, when extracting
parton distribution functions in the large-x region, it is crucial to correct
the data for effects associated with the nonzero mass of the target. We present
here a comprehensive review of these target mass corrections (TMC) to structure
functions data, summarizing the relevant formulas for TMCs in electromagnetic
and weak processes. We include a full analysis of both hadronic and partonic
masses, and trace how these effects appear in the operator product expansion
and the factorized parton model formalism, as well as their limitations when
applied to data in the x->1 limit. We evaluate the numerical effects of TMCs on
various structure functions, and compare fits to data with and without these
corrections.
| [
{
"created": "Wed, 12 Sep 2007 19:24:48 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Apr 2008 15:32:59 GMT",
"version": "v2"
}
] | 2010-03-26 | [
[
"Schienbein",
"Ingo",
""
],
[
"Radescu",
"Voica A.",
""
],
[
"Zeller",
"G. P.",
""
],
[
"Christy",
"M. Eric",
""
],
[
"Keppel",
"C. E.",
""
],
[
"McFarland",
"Kevin S.",
""
],
[
"Melnitchouk",
"W.",
""
],... | With recent advances in the precision of inclusive lepton--nuclear scattering experiments, it has become apparent that comparable improvements are needed in the accuracy of the theoretical analysis tools. In particular, when extracting parton distribution functions in the large-x region, it is crucial to correct the data for effects associated with the nonzero mass of the target. We present here a comprehensive review of these target mass corrections (TMC) to structure functions data, summarizing the relevant formulas for TMCs in electromagnetic and weak processes. We include a full analysis of both hadronic and partonic masses, and trace how these effects appear in the operator product expansion and the factorized parton model formalism, as well as their limitations when applied to data in the x->1 limit. We evaluate the numerical effects of TMCs on various structure functions, and compare fits to data with and without these corrections. |
hep-ph/0509159 | Klaus Moenig | Klaus Moenig | Physics at Future Linear Colliders | Invited talk at the Lepton Photon Symposium 2005, Upsala, Sweden,
July 2005, V2: minor improvements | Int.J.Mod.Phys.A21:1974-1986,2006 | 10.1142/S0217751X06032915 | DESY 05-207, LAL 05-98 | hep-ph | null | This article summarises the physics at future linear colliders. It will be
shown that in all studied physics scenarios a 1 TeV linear collider in addition
to the LHC will enhance our knowledge significantly and helps to reconstruct
the model of new physics nature has chosen.
| [
{
"created": "Thu, 15 Sep 2005 15:29:08 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2005 12:13:32 GMT",
"version": "v2"
}
] | 2011-02-09 | [
[
"Moenig",
"Klaus",
""
]
] | This article summarises the physics at future linear colliders. It will be shown that in all studied physics scenarios a 1 TeV linear collider in addition to the LHC will enhance our knowledge significantly and helps to reconstruct the model of new physics nature has chosen. |
hep-ph/0404267 | Sergei Troyan | B. I. Ermolaev, M. Greco and S. I. Troyan | Spin-Dependent Structure Function g_1 at Small x | Talk given at the 17th Workshop in Particle Physics, La Thuile,Italy,
Feb.29-Mar. 6, 2004. 13p | null | null | null | hep-ph | null | Accounting for double-logarithms of x and running QCD coupling leads to
expressions for both the non-singlet and singlet components of $g_1$. These
expressions manifest the Regge asymptotics when x ->0 and differ considerably
from the DGLAP expressions at small values of x.
| [
{
"created": "Thu, 29 Apr 2004 14:08:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ermolaev",
"B. I.",
""
],
[
"Greco",
"M.",
""
],
[
"Troyan",
"S. I.",
""
]
] | Accounting for double-logarithms of x and running QCD coupling leads to expressions for both the non-singlet and singlet components of $g_1$. These expressions manifest the Regge asymptotics when x ->0 and differ considerably from the DGLAP expressions at small values of x. |
1604.03940 | David Marzocca | Dario Buttazzo, Admir Greljo, Gino Isidori, David Marzocca | Toward a coherent solution of diphoton and flavor anomalies | v2: 32 pages, 9 figures, 2 tables. Published version. Extended
discussion about the flavor structure of the model and high-PT phenomenology,
typos corrected. Added note about the relevance of the paper in light of the
absence of the diphoton signal at the LHC | JHEP 1608 (2016) 035 | 10.1007/JHEP08(2016)035 | ZU-TH-13/16 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a coherent explanation for the 750 GeV diphoton anomaly and the
hints of deviations from Lepton Flavor Universality in B decays in terms a new
strongly interacting sector with vectorlike confinement. The diphoton excess
arises from the decay of one of the pseudo-Nambu-Goldstone bosons of the new
sector, while the flavor anomalies are a manifestation of the exchange of the
corresponding vector resonances (with masses in the 1.5-2.5 TeV range). We
provide explicit examples (with detailed particle content and group structure)
of the new sector, discussing both the low-energy flavor-physics phenomenology
and the signatures at high $p_T$. We show that specific models can provide an
excellent fit to all available data. A key feature of all realizations is a
sizable broad excess in the tails of $\tau^+ \tau^-$ invariant mass
distribution in $p p \to \tau^+ \tau^-$, that should be accessible at the LHC
in the near future.
| [
{
"created": "Wed, 13 Apr 2016 20:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2016 14:53:03 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Buttazzo",
"Dario",
""
],
[
"Greljo",
"Admir",
""
],
[
"Isidori",
"Gino",
""
],
[
"Marzocca",
"David",
""
]
] | We propose a coherent explanation for the 750 GeV diphoton anomaly and the hints of deviations from Lepton Flavor Universality in B decays in terms a new strongly interacting sector with vectorlike confinement. The diphoton excess arises from the decay of one of the pseudo-Nambu-Goldstone bosons of the new sector, while the flavor anomalies are a manifestation of the exchange of the corresponding vector resonances (with masses in the 1.5-2.5 TeV range). We provide explicit examples (with detailed particle content and group structure) of the new sector, discussing both the low-energy flavor-physics phenomenology and the signatures at high $p_T$. We show that specific models can provide an excellent fit to all available data. A key feature of all realizations is a sizable broad excess in the tails of $\tau^+ \tau^-$ invariant mass distribution in $p p \to \tau^+ \tau^-$, that should be accessible at the LHC in the near future. |
hep-ph/9603309 | null | Zhi-jian Tao | Radiative Seesaw Mechanism at Weak Scale | 12 Pages, latex, no figures | Phys.Rev.D54:5693-5697,1996 | 10.1103/PhysRevD.54.5693 | null | hep-ph | null | We investigate an alternative seesaw mechanism for neutrino mass generation.
Neutrino mass is generated at loop level but the basic concept of usual seesaw
mechanism is kept. One simple model is constructed to show how this mechanism
is realized. The applications of this seesaw mechanism at weak scale to
cosmology and neutrino physics are discussed.
| [
{
"created": "Thu, 14 Mar 1996 17:48:27 GMT",
"version": "v1"
}
] | 2011-02-24 | [
[
"Tao",
"Zhi-jian",
""
]
] | We investigate an alternative seesaw mechanism for neutrino mass generation. Neutrino mass is generated at loop level but the basic concept of usual seesaw mechanism is kept. One simple model is constructed to show how this mechanism is realized. The applications of this seesaw mechanism at weak scale to cosmology and neutrino physics are discussed. |
hep-ph/0609061 | Daijiro Suematsu | Satoshi Nakamura and Daijiro Suematsu | Supersymmetric extra U(1) models with a singlino dominated LSP | 33 pages, 7 figures, gaugino mass relation was changed and figures
were replaced, main conclusions were not changed, accepted version in PRD | Phys.Rev.D75:055004,2007 | 10.1103/PhysRevD.75.055004 | KANAZAWA-06-08 | hep-ph | null | We investigate phenomenology related to the neutral fields in supersymmetric
models with an extra U(1) derived from $E_6$. Our study is concentrated into
the models which have a singlino dominated neutralino as the lightest
superparticle (LSP). If such models satisfy a constraint for dark matter
derived from the WMAP data, the lightest neutral Higgs scalar, a new neutral
gauge field $Z^\prime$ and the LSP may be interesting targets for the study at
the LHC. We also discuss features of the $Z^\prime$ in the models and its
detectability at the LHC.
| [
{
"created": "Wed, 6 Sep 2006 11:45:14 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2007 10:35:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nakamura",
"Satoshi",
""
],
[
"Suematsu",
"Daijiro",
""
]
] | We investigate phenomenology related to the neutral fields in supersymmetric models with an extra U(1) derived from $E_6$. Our study is concentrated into the models which have a singlino dominated neutralino as the lightest superparticle (LSP). If such models satisfy a constraint for dark matter derived from the WMAP data, the lightest neutral Higgs scalar, a new neutral gauge field $Z^\prime$ and the LSP may be interesting targets for the study at the LHC. We also discuss features of the $Z^\prime$ in the models and its detectability at the LHC. |
1310.5602 | Richard Luddy | M.M. Islam and R.J. Luddy | High Energy pp Elastic Scattering in Condensate Enclosed Chiral Bag
Model and TOTEM Elastic Measurements at LHC at 7 TeV | Presented at EDS Blois 2013 (arXiv:1309.5705) | null | null | EDSBlois/2013/05 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study high energy $\small{\rm{pp}}$ and $\small{\rm{\bar {p}p}}$ elastic
scattering in the TeV region based on an effective field theory model of the
proton. We phenomenologically investigate the main processes underlying elastic
scattering and quantitatively describe the measured elastic
d$\small{\sigma}$/dt at energies 7.0 TeV (LHC $\small{\rm{pp}}$), 1.96 TeV
(Tevatron $\small{\rm{\bar {p}p}}$), and 0.630 TeV (SPS $\small{\rm{\bar
{p}p}}$). Finally, we give our prediction for $\small{\rm{pp}}$ elastic
d$\small{\sigma}$/dt at 14 TeV that will be measured by the TOTEM
Collaboration.
| [
{
"created": "Mon, 21 Oct 2013 15:31:20 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Oct 2013 02:53:10 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Oct 2013 20:52:17 GMT",
"version": "v3"
}
] | 2013-10-31 | [
[
"Islam",
"M. M.",
""
],
[
"Luddy",
"R. J.",
""
]
] | We study high energy $\small{\rm{pp}}$ and $\small{\rm{\bar {p}p}}$ elastic scattering in the TeV region based on an effective field theory model of the proton. We phenomenologically investigate the main processes underlying elastic scattering and quantitatively describe the measured elastic d$\small{\sigma}$/dt at energies 7.0 TeV (LHC $\small{\rm{pp}}$), 1.96 TeV (Tevatron $\small{\rm{\bar {p}p}}$), and 0.630 TeV (SPS $\small{\rm{\bar {p}p}}$). Finally, we give our prediction for $\small{\rm{pp}}$ elastic d$\small{\sigma}$/dt at 14 TeV that will be measured by the TOTEM Collaboration. |
1908.01185 | Ho-Meoyng Choi | Ho-Meoyng Choi, T. Frederico, Chueng-Ryong Ji, and J. P. B. C. de Melo | Pion off-shell electromagnetic form factors: data extraction and model
analysis | typo corrected; revision for the discussion in Sec. III.; 11pages, 10
figures; version to appear in Physical Review D | Phys. Rev. D 100, 116020 (2019) | 10.1103/PhysRevD.100.116020 | APCTP Pre2019-019, LFTC-19-9/47 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the pion electromagnetic half off-shell form factors, which
parametrize the matrix element of the charged pion electromagnetic current with
one leg off-mass-shell and the other leg on-mass-shell, using an exactly
solvable manifestly covariant model of a $(3+1)$ dimensional fermion field
theory. The model provides a 3D imaging of the two off-shell pion form factors
$F_1$ and $F_2$ as a function of $(Q^2,t)$, which are related to each other
satisfying the Ward-Takahashi identity. The normalization of the renormalized
charge form factor $F_1$ is fixed by $F_1(Q^2=0, t=m^2_\pi)=1$ while the other
form factor $F_2$ vanishes, i.e. $F_2(Q^2, t=m^2_\pi)=0$ for any value of $Q^2$
due to the time-reversal invariance of the strong interaction. We define the
new form factor $g(Q^2,t)=F_2(Q^2,t)/(t-m^2_\pi)$ and find that $g(Q^2,t)$ can
be measurable in the on-mass-shell limit. In particular, $g(Q^2=0, t=m^2_\pi)$
is related with the pion charge radius. We also compare our form factors with
the data extracted from the pion electroproduction reaction for both the
off-shell region ($t<0$) and the on-shell limit ($t \rightarrow m_\pi^2$).
| [
{
"created": "Sat, 3 Aug 2019 14:50:32 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2019 23:53:08 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Nov 2019 12:55:45 GMT",
"version": "v3"
},
{
"created": "Mon, 23 Dec 2019 08:24:09 GMT",
"version": "v4"
}
] | 2020-01-01 | [
[
"Choi",
"Ho-Meoyng",
""
],
[
"Frederico",
"T.",
""
],
[
"Ji",
"Chueng-Ryong",
""
],
[
"de Melo",
"J. P. B. C.",
""
]
] | We investigate the pion electromagnetic half off-shell form factors, which parametrize the matrix element of the charged pion electromagnetic current with one leg off-mass-shell and the other leg on-mass-shell, using an exactly solvable manifestly covariant model of a $(3+1)$ dimensional fermion field theory. The model provides a 3D imaging of the two off-shell pion form factors $F_1$ and $F_2$ as a function of $(Q^2,t)$, which are related to each other satisfying the Ward-Takahashi identity. The normalization of the renormalized charge form factor $F_1$ is fixed by $F_1(Q^2=0, t=m^2_\pi)=1$ while the other form factor $F_2$ vanishes, i.e. $F_2(Q^2, t=m^2_\pi)=0$ for any value of $Q^2$ due to the time-reversal invariance of the strong interaction. We define the new form factor $g(Q^2,t)=F_2(Q^2,t)/(t-m^2_\pi)$ and find that $g(Q^2,t)$ can be measurable in the on-mass-shell limit. In particular, $g(Q^2=0, t=m^2_\pi)$ is related with the pion charge radius. We also compare our form factors with the data extracted from the pion electroproduction reaction for both the off-shell region ($t<0$) and the on-shell limit ($t \rightarrow m_\pi^2$). |
hep-ph/9807538 | Bjoern Poetter | B. P\"otter | Jet Cross Sections in gamma^*-gamma Scattering at e+e- Colliders in NLO
QCD | 4 pages, LaTeX, 3 eps figures, espcrc2 style used. Talk given at
International Euroconference on Quantum Chromodynamics (QCD 98), Montpellier,
France, 2-8 Jul 1998 | Nucl.Phys.Proc.Suppl.74:68-71,1999 | 10.1016/S0920-5632(99)00136-X | null | hep-ph | null | Recent results from NLO QCD calculations for inclusive jet cross sections in
gamma^*-gamma scattering at e+e- colliders, especially for LEP, are reported.
The virtuality Q^2 of the virtual photon is non-zero and can be unlimited
large. The virtuality of the second photon is zero and the spectrum is
calculated with the Weizs"acker-Williams approximation. Four components of the
cross sections have to be distinguished, involving direct and resolved real and
virtual photon contributions. Since Q^2 is non-zero, the virtual photon
structure function is needed to calculate the contributions involving a
resolved virtual photon.
| [
{
"created": "Wed, 29 Jul 1998 14:51:05 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Pötter",
"B.",
""
]
] | Recent results from NLO QCD calculations for inclusive jet cross sections in gamma^*-gamma scattering at e+e- colliders, especially for LEP, are reported. The virtuality Q^2 of the virtual photon is non-zero and can be unlimited large. The virtuality of the second photon is zero and the spectrum is calculated with the Weizs"acker-Williams approximation. Four components of the cross sections have to be distinguished, involving direct and resolved real and virtual photon contributions. Since Q^2 is non-zero, the virtual photon structure function is needed to calculate the contributions involving a resolved virtual photon. |
hep-ph/9807431 | Eric C. Martell | David Bowser-Chao, Tom D. Imbo, B. Alex King, Eric C. Martell | Resonant Bound State Production at e- e- Colliders | 8 pages, 1 table, plain TeX, requires harvmac. Brief comparison to
leptoglueball production at e+e- colliders added. Other minor changes. To
appear in Physics Letters B | Phys.Lett. B441 (1998) 468-472 | 10.1016/S0370-2693(98)01151-4 | UICHEP-TH/98-6 | hep-ph | null | Observation of a sequence of resonances at an e-e- collider would suggest
bound states of strongly coupled constituents carrying lepton number. Obvious
candidates for these exotic constituents are leptoquarks and leptogluons. We
show that under reasonable assumptions, the existence of one leptogluon flavor
of appropriate mass can give rise to sizeable ``leptoglueball'' production
rates and observable resonance peaks. In contrast, one needs two leptoquark
flavors in order to produce the analogous ``leptoquarkonium'' states. Moreover,
cross-generational leptoquark couplings are necessary to give observable event
rates in many cases, and leptoquarkonium mass splittings are too small to
resolve with realistic beam energy resolutions.
| [
{
"created": "Mon, 20 Jul 1998 22:06:31 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 1998 19:02:57 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bowser-Chao",
"David",
""
],
[
"Imbo",
"Tom D.",
""
],
[
"King",
"B. Alex",
""
],
[
"Martell",
"Eric C.",
""
]
] | Observation of a sequence of resonances at an e-e- collider would suggest bound states of strongly coupled constituents carrying lepton number. Obvious candidates for these exotic constituents are leptoquarks and leptogluons. We show that under reasonable assumptions, the existence of one leptogluon flavor of appropriate mass can give rise to sizeable ``leptoglueball'' production rates and observable resonance peaks. In contrast, one needs two leptoquark flavors in order to produce the analogous ``leptoquarkonium'' states. Moreover, cross-generational leptoquark couplings are necessary to give observable event rates in many cases, and leptoquarkonium mass splittings are too small to resolve with realistic beam energy resolutions. |
1005.5655 | Harleen Dahiya Dr. | Neetika Sharma and Harleen Dahiya | Quark sea asymmetries of the octet baryons | 7 pages, 2 figures, to appear in Phys. Rev. D | Phys.Rev.D81:114003,2010 | 10.1103/PhysRevD.81.114003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of "quark sea" in determining the flavor structure of the octet
baryons have been investigated in the chiral constituent quark model (\chiCQM).
The \chiCQM is able to qualitatively generate the requisite amount of quark sea
and is also known to provide a satisfactory explanation of the proton spin and
related issues in the nonperturbative regime. The Bjorken scaling variable x
has been included phenomenologically in the sea quark distribution functions to
understand its implications on the quark sea asymmetries like \bar d(x)-\bar
(x), \bar d(x)/\bar u(x) and Gottfried integral for the octet baryons. The
results strengthen the importance of quark sea at lower values of x.
| [
{
"created": "Mon, 31 May 2010 10:35:44 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Sharma",
"Neetika",
""
],
[
"Dahiya",
"Harleen",
""
]
] | The effects of "quark sea" in determining the flavor structure of the octet baryons have been investigated in the chiral constituent quark model (\chiCQM). The \chiCQM is able to qualitatively generate the requisite amount of quark sea and is also known to provide a satisfactory explanation of the proton spin and related issues in the nonperturbative regime. The Bjorken scaling variable x has been included phenomenologically in the sea quark distribution functions to understand its implications on the quark sea asymmetries like \bar d(x)-\bar (x), \bar d(x)/\bar u(x) and Gottfried integral for the octet baryons. The results strengthen the importance of quark sea at lower values of x. |
1703.00478 | Iason Baldes | Iason Baldes, Kalliopi Petraki | Asymmetric thermal-relic dark matter: Sommerfeld-enhanced freeze-out,
annihilation signals and unitarity bounds | 31 pages, 8 figures. V2: small corrections, added discussion and
references | JCAP 1709 (2017) 028 | 10.1088/1475-7516/2017/09/028 | DESY 17-034; Nikhef 2017-009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter that possesses a particle-antiparticle asymmetry and has
thermalised in the early universe, requires a larger annihilation cross-section
compared to symmetric dark matter, in order to deplete the dark antiparticles
and account for the observed dark matter density. The annihilation
cross-section determines the residual symmetric component of dark matter, which
may give rise to annihilation signals during CMB and inside haloes today. We
consider dark matter with long-range interactions, in particular dark matter
coupled to a light vector or scalar force mediator. We compute the couplings
required to attain a final antiparticle-to-particle ratio after the thermal
freeze-out of the annihilation processes in the early universe, and then
estimate the late-time annihilation signals. We show that, due to the
Sommerfeld enhancement, highly asymmetric dark matter with long-range
interactions can have a significant annihilation rate, potentially larger than
symmetric dark matter of the same mass with contact interactions. We discuss
caveats in this estimation, relating to the formation of stable bound states.
Finally, we consider the non-relativistic partial-wave unitarity bound on the
inelastic cross-section, we discuss why it can be realised only by long-range
interactions, and showcase the importance of higher partial waves in this
regime of large inelasticity. We derive upper bounds on the mass of symmetric
and asymmetric thermal-relic dark matter for s-wave and p-wave annihilation,
and exhibit how these bounds strengthen as the dark asymmetry increases.
| [
{
"created": "Wed, 1 Mar 2017 19:36:12 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2017 09:20:41 GMT",
"version": "v2"
}
] | 2017-09-22 | [
[
"Baldes",
"Iason",
""
],
[
"Petraki",
"Kalliopi",
""
]
] | Dark matter that possesses a particle-antiparticle asymmetry and has thermalised in the early universe, requires a larger annihilation cross-section compared to symmetric dark matter, in order to deplete the dark antiparticles and account for the observed dark matter density. The annihilation cross-section determines the residual symmetric component of dark matter, which may give rise to annihilation signals during CMB and inside haloes today. We consider dark matter with long-range interactions, in particular dark matter coupled to a light vector or scalar force mediator. We compute the couplings required to attain a final antiparticle-to-particle ratio after the thermal freeze-out of the annihilation processes in the early universe, and then estimate the late-time annihilation signals. We show that, due to the Sommerfeld enhancement, highly asymmetric dark matter with long-range interactions can have a significant annihilation rate, potentially larger than symmetric dark matter of the same mass with contact interactions. We discuss caveats in this estimation, relating to the formation of stable bound states. Finally, we consider the non-relativistic partial-wave unitarity bound on the inelastic cross-section, we discuss why it can be realised only by long-range interactions, and showcase the importance of higher partial waves in this regime of large inelasticity. We derive upper bounds on the mass of symmetric and asymmetric thermal-relic dark matter for s-wave and p-wave annihilation, and exhibit how these bounds strengthen as the dark asymmetry increases. |
hep-ph/9501387 | Goran Senjanovic | Gia Dvali and Goran Senjanovic | IS THERE A DOMAIN WALL PROBLEM? | latex, 12 pages | Phys.Rev.Lett.74:5178-5181,1995 | 10.1103/PhysRevLett.74.5178 | IFUP-TH 61/94 | hep-ph | null | We show that spontaneous breaking of discrete or continuous symmetries does
not necessarily imply either symmetry restoration or the thermal production of
defects at high temperature (at least up to $T \sim M_{Planck}$). This may
imply that there is no domain wall problem. As an example we show how this
applies to the Peccei-Quinn scenario.
| [
{
"created": "Thu, 26 Jan 1995 20:08:45 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Dvali",
"Gia",
""
],
[
"Senjanovic",
"Goran",
""
]
] | We show that spontaneous breaking of discrete or continuous symmetries does not necessarily imply either symmetry restoration or the thermal production of defects at high temperature (at least up to $T \sim M_{Planck}$). This may imply that there is no domain wall problem. As an example we show how this applies to the Peccei-Quinn scenario. |
1508.04459 | A. D. Polosa | L. Maiani, A.D. Polosa, V. Riquer | From Pentaquarks to Dibaryons in Lambda_b(5620) decays | 2 pages, references added, minor modifications, to appear in Phys.
Lett. B | null | 10.1016/j.physletb.2015.08.049 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pentaquarks and dibaryons are natural possibilities if diquarks are used as
the building blocks to assemble hadrons. In this short note, motivated by the
very recent discovery of two pentaquark states, we highlight some possible
channels to search for dibaryons in Lambda_b(5620) decays.
| [
{
"created": "Mon, 17 Aug 2015 17:29:58 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2015 17:43:29 GMT",
"version": "v2"
}
] | 2015-09-30 | [
[
"Maiani",
"L.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] | Pentaquarks and dibaryons are natural possibilities if diquarks are used as the building blocks to assemble hadrons. In this short note, motivated by the very recent discovery of two pentaquark states, we highlight some possible channels to search for dibaryons in Lambda_b(5620) decays. |
hep-ph/9812267 | Gudrun Hiller | A. Ali (DESY, Hamburg) and G. Hiller (Frascati) | A Theoretical Reappraisal of Branching Ratios and CP Asymmetries in the
Decays $B \to (X_d,X_s) \ell^+ \ell^-$ and Determination of the CKM
Parameters | 18 pages, 7 figures (require epsf.sty) | Eur.Phys.J.C8:619-629,1999 | 10.1007/s100520050497 | DESY 98-187, LNF-98/041(P), December 1998 | hep-ph | null | We present a theoretical reappraisal of the branching ratios and CP
asymmetries for the decays $ B \to X_q \ell^+ \ell^-$, with $q=d,s$, taking
into account current theoretical uncertainties in the description of the
inclusive decay amplitudes from the long-distance contributions, an improved
treatment of the renormalization scale dependence, and other parametric
dependencies. Concentrating on the partial branching ratios $\Delta {\cal B}(B
\to X_q \ell^+ \ell^-)$, integrated over the invariant dilepton mass region $1
{GeV}^2 \leq s \leq 6 {GeV}^2$, we calculate theoretical precision on the
charge-conjugate averaged partial branching ratios $<\Delta{\cal B}_q >=
(\Delta {\cal B}(B \to X_q \ell^+ \ell^-) + \Delta {\cal B}(\bar{B} \to
\bar{X}_q \ell^+ \ell^-))/2$, CP asymmetries in partial decay rates
$(a_{CP})_q=(\Delta {\cal B}(B \to X_q \ell^+ \ell^-) - \Delta {\cal B}(\bar{B}
\to \bar{X}_q \ell^+ \ell^-))/(2 < \Delta{\cal B}_q >)$, and the ratio of the
branching ratios $\Delta {\cal R} = < \Delta{\cal B}_d >/< \Delta{\cal B}_s>$.
For the central values of the CKM parameters, we find $<\Delta {\cal B}_s >
=(2.22^{+0.29}_{-0.30}) \times 10^{-6}$, $<\Delta {\cal B}_d >
=(9.61^{+1.32}_{-1.47}) \times 10^{-8}$, $(a_{CP})_s
=-(0.19^{+0.17}_{-0.19})%$, $(a_{CP})_d =(4.40^{+3.87}_{-4.46})%$, and $\Delta
{\cal R} =(4.32 \pm 0.03)%$. The dependence of $<\Delta{\cal B}_d>$ and $\Delta
{\cal R}$ on the CKM parameters is worked out and the resulting constraints on
the unitarity triangle from an eventual measurement of $\Delta {\cal R}$ are
illustrated.
| [
{
"created": "Mon, 7 Dec 1998 09:58:48 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Ali",
"A.",
"",
"DESY, Hamburg"
],
[
"Hiller",
"G.",
"",
"Frascati"
]
] | We present a theoretical reappraisal of the branching ratios and CP asymmetries for the decays $ B \to X_q \ell^+ \ell^-$, with $q=d,s$, taking into account current theoretical uncertainties in the description of the inclusive decay amplitudes from the long-distance contributions, an improved treatment of the renormalization scale dependence, and other parametric dependencies. Concentrating on the partial branching ratios $\Delta {\cal B}(B \to X_q \ell^+ \ell^-)$, integrated over the invariant dilepton mass region $1 {GeV}^2 \leq s \leq 6 {GeV}^2$, we calculate theoretical precision on the charge-conjugate averaged partial branching ratios $<\Delta{\cal B}_q >= (\Delta {\cal B}(B \to X_q \ell^+ \ell^-) + \Delta {\cal B}(\bar{B} \to \bar{X}_q \ell^+ \ell^-))/2$, CP asymmetries in partial decay rates $(a_{CP})_q=(\Delta {\cal B}(B \to X_q \ell^+ \ell^-) - \Delta {\cal B}(\bar{B} \to \bar{X}_q \ell^+ \ell^-))/(2 < \Delta{\cal B}_q >)$, and the ratio of the branching ratios $\Delta {\cal R} = < \Delta{\cal B}_d >/< \Delta{\cal B}_s>$. For the central values of the CKM parameters, we find $<\Delta {\cal B}_s > =(2.22^{+0.29}_{-0.30}) \times 10^{-6}$, $<\Delta {\cal B}_d > =(9.61^{+1.32}_{-1.47}) \times 10^{-8}$, $(a_{CP})_s =-(0.19^{+0.17}_{-0.19})%$, $(a_{CP})_d =(4.40^{+3.87}_{-4.46})%$, and $\Delta {\cal R} =(4.32 \pm 0.03)%$. The dependence of $<\Delta{\cal B}_d>$ and $\Delta {\cal R}$ on the CKM parameters is worked out and the resulting constraints on the unitarity triangle from an eventual measurement of $\Delta {\cal R}$ are illustrated. |
0812.3183 | Gernot Eichmann | Gernot Eichmann, Reinhard Alkofer, Andreas Krassnigg, Diana Nicmorus | Meson and nucleon properties from Dyson-Schwinger QCD | 5 pages, 2 figures; talk given at the 8th Conference "Quark
Confinement and the Hadron Spectrum", Mainz, Germany, September 1-6, 2008 | PoS Confinement8:077,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present selected results from a calculation of meson and nucleon
observables in a Green-function approach. A rainbow-ladder truncation of QCD's
Dyson-Schwinger equations is used to solve the respective meson, diquark and
quark-diquark Bethe-Salpeter equations. It allows for a simultaneous
description of meson and nucleon masses and electromagnetic properties from an
effective quark-gluon interaction. The results describe a hadronic quark core
which agrees with lattice data for heavy quarks whereas pion-cloud effects are
missing towards the chiral limit. The neutron's Dirac form factor is negative
due to the presence of axial-vector diquark correlations.
| [
{
"created": "Wed, 17 Dec 2008 00:03:02 GMT",
"version": "v1"
}
] | 2009-06-25 | [
[
"Eichmann",
"Gernot",
""
],
[
"Alkofer",
"Reinhard",
""
],
[
"Krassnigg",
"Andreas",
""
],
[
"Nicmorus",
"Diana",
""
]
] | We present selected results from a calculation of meson and nucleon observables in a Green-function approach. A rainbow-ladder truncation of QCD's Dyson-Schwinger equations is used to solve the respective meson, diquark and quark-diquark Bethe-Salpeter equations. It allows for a simultaneous description of meson and nucleon masses and electromagnetic properties from an effective quark-gluon interaction. The results describe a hadronic quark core which agrees with lattice data for heavy quarks whereas pion-cloud effects are missing towards the chiral limit. The neutron's Dirac form factor is negative due to the presence of axial-vector diquark correlations. |
1612.01167 | Vaibhav Rawoot | Rohini M. Godbole, Abhiram Kaushik, Anuradha Misra, Vaibhav Rawoot,
Bipin Sonawane | Heavy Flavour production as probe of Gluon Sivers Function | Proceedings of Light Cone 2016, September 5-8, 2016, Universidade de
Lisboa, Lisbon, Portugal | null | 10.1007/s00601-017-1256-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy flavour production like $J/\psi$ and $D$- meson production in
scattering of electrons/unpolarized protons off polarized proton target offer
promising probes to investigate gluon Sivers function. In this talk, I will
summarize our recent work on trasverse single spin asymmetry in $J/\psi $
-production and $D$ - meson production in $p p^\uparrow$ scattering using a
generalized parton model approach. We compare predictions obtained using
different models of gluon Sivers function within this approach and then, taking
into account the transverse momentum dependent evolution of the unpolarized
parton distribution functions and gluon Sivers function, we study the effect of
evolution on asymmetry.
| [
{
"created": "Sun, 4 Dec 2016 19:05:33 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Godbole",
"Rohini M.",
""
],
[
"Kaushik",
"Abhiram",
""
],
[
"Misra",
"Anuradha",
""
],
[
"Rawoot",
"Vaibhav",
""
],
[
"Sonawane",
"Bipin",
""
]
] | Heavy flavour production like $J/\psi$ and $D$- meson production in scattering of electrons/unpolarized protons off polarized proton target offer promising probes to investigate gluon Sivers function. In this talk, I will summarize our recent work on trasverse single spin asymmetry in $J/\psi $ -production and $D$ - meson production in $p p^\uparrow$ scattering using a generalized parton model approach. We compare predictions obtained using different models of gluon Sivers function within this approach and then, taking into account the transverse momentum dependent evolution of the unpolarized parton distribution functions and gluon Sivers function, we study the effect of evolution on asymmetry. |
hep-ph/0210177 | Massimiliano Grazzini | M. Grazzini, R. Nania | Hadronic physics and QCD: status and future | 9 pages, 5 ps figures, summary talk of the Hadronic Physics session
at ``IFAE'', the XIV italian meeting of High Energy Physics, Parma April 2002 | null | null | null | hep-ph hep-ex | null | Studies of hadronic final states are entering a new phase where very precise
experimental measurements require better theoretical predictions for a
meaningful comparison. Recent results and future developments are briefly
reviewed both for the experiments and the theory.
| [
{
"created": "Fri, 11 Oct 2002 16:17:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grazzini",
"M.",
""
],
[
"Nania",
"R.",
""
]
] | Studies of hadronic final states are entering a new phase where very precise experimental measurements require better theoretical predictions for a meaningful comparison. Recent results and future developments are briefly reviewed both for the experiments and the theory. |
1511.03904 | Vladimir Voronin | Sergei N. Nedelko, Vladimir E. Voronin | Radial Meson Excitations and Abelian Self-Dual Gluon Fields | Talk given at The 9th Joint International Hadron Structure '15
Conference, Horny Smokovec, Slovak Republic, 29 June-3 July 2015, to be
published in International Journal of Modern Physics: Conference Series | null | 10.1142/S2010194515601052 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review motivation and results of the approach to QCD vacuum as a
medium describable in terms of statistical ensemble of almost everywhere
constant Abelian (anti-)self-dual gluon fields. An overview of the
hadronization formalism based on this ensemble is presented. New results for
radial excitations of light, heavy-light mesons and heavy quarkonia are
presented. A possible interrelation between the present approach and
holographic QCD with harmonic confinement is outlined.
| [
{
"created": "Thu, 12 Nov 2015 14:41:28 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Nedelko",
"Sergei N.",
""
],
[
"Voronin",
"Vladimir E.",
""
]
] | We briefly review motivation and results of the approach to QCD vacuum as a medium describable in terms of statistical ensemble of almost everywhere constant Abelian (anti-)self-dual gluon fields. An overview of the hadronization formalism based on this ensemble is presented. New results for radial excitations of light, heavy-light mesons and heavy quarkonia are presented. A possible interrelation between the present approach and holographic QCD with harmonic confinement is outlined. |
1202.5391 | Balasubramanian Ananthanarayan | B. Ananthanarayan, Irinel Caprini | Constraining Form Factors with the Method of Unitarity Bounds | 12 pages, 2 figures; Lecture given at the DAE-BRNS Workshop on Hadron
Physics, Bhabha Atomic Research Centre, Mumbai, India, October 31-November 4,
2011, submitted to Proceedings | Journal of Physics: Conference Series 374 (2012) 012011 | 10.1088/1742-6596/374/1/012011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The availability of a reliable bound on an integral involving the square of
the modulus of a form factor on the unitarity cut allows one to constrain the
form factor at points inside the analyticity domain and its shape parameters,
and also to isolate domains on the real axis and in the complex energy plane
where zeros are excluded. In this lecture note, we review the mathematical
techniques of this formalism in its standard form, known as the method of
unitarity bounds, and recent developments which allow us to include information
on the phase and modulus along a part of the unitarity cut. We also provide a
brief summary of some results that we have obtained in the recent past, which
demonstrate the usefulness of the method for precision predictions on the form
factors.
| [
{
"created": "Fri, 24 Feb 2012 08:25:04 GMT",
"version": "v1"
}
] | 2012-07-25 | [
[
"Ananthanarayan",
"B.",
""
],
[
"Caprini",
"Irinel",
""
]
] | The availability of a reliable bound on an integral involving the square of the modulus of a form factor on the unitarity cut allows one to constrain the form factor at points inside the analyticity domain and its shape parameters, and also to isolate domains on the real axis and in the complex energy plane where zeros are excluded. In this lecture note, we review the mathematical techniques of this formalism in its standard form, known as the method of unitarity bounds, and recent developments which allow us to include information on the phase and modulus along a part of the unitarity cut. We also provide a brief summary of some results that we have obtained in the recent past, which demonstrate the usefulness of the method for precision predictions on the form factors. |
1205.6068 | Alessandro Papa | Dmitry Yu. Ivanov and Alessandro Papa | Inclusive production of a pair of hadrons separated by a large interval
of rapidity in proton collisions | 29 pages, 9 figures; corrected few typos and added an acknowledgment;
version to be published on JHEP. arXiv admin note: substantial text overlap
with arXiv:1202.1082 | null | 10.1007/JHEP07(2012)045 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider within QCD collinear factorization the inclusive process $p+p\to
h_1+h_2+X$, where the pair of identified hadrons, $h_1,h_2$, having large
transverse momenta is produced in high-energy proton-proton collisions. In
particular, we concentrate on the kinematics where the two identified hadrons
in the final state are separated by a large interval of rapidity $\Delta y$. In
this case the (calculable) hard part of the reaction receives large higher
order corrections $\sim \alpha^n_s \Delta y^n$. We provide a theoretical input
for the resummation of such contributions with next-to-leading logarithmic
accuracy (NLA) in the BFKL approach. Specifically, we calculate in NLA the
vertex (impact-factor) for the inclusive production of the identified hadron.
This process has much in common with the widely discussed Mueller-Navelet jets
production and can be also used to access the BFKL dynamics at proton
colliders. Another application of the obtained identified-hadron vertex could
be the NLA BFKL description of inclusive forward hadron production in DIS.
| [
{
"created": "Mon, 28 May 2012 10:04:22 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jul 2012 08:51:37 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Papa",
"Alessandro",
""
]
] | We consider within QCD collinear factorization the inclusive process $p+p\to h_1+h_2+X$, where the pair of identified hadrons, $h_1,h_2$, having large transverse momenta is produced in high-energy proton-proton collisions. In particular, we concentrate on the kinematics where the two identified hadrons in the final state are separated by a large interval of rapidity $\Delta y$. In this case the (calculable) hard part of the reaction receives large higher order corrections $\sim \alpha^n_s \Delta y^n$. We provide a theoretical input for the resummation of such contributions with next-to-leading logarithmic accuracy (NLA) in the BFKL approach. Specifically, we calculate in NLA the vertex (impact-factor) for the inclusive production of the identified hadron. This process has much in common with the widely discussed Mueller-Navelet jets production and can be also used to access the BFKL dynamics at proton colliders. Another application of the obtained identified-hadron vertex could be the NLA BFKL description of inclusive forward hadron production in DIS. |
2305.06401 | Gael Finauri | Martin Beneke, Gael Finauri, K. Keri Vos, Yanbing Wei | QCD Light-Cone Distribution Amplitudes of Heavy Mesons from boosted HQET | 55 pages, 12 figures | null | null | TUM-HEP-1455/23, Nikhef-2023-003 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light-cone distribution amplitudes (LCDAs) frequently arise in factorization
theorems involving light and heavy mesons. The QCD LCDA for heavy mesons
includes short-distance physics at energy scales of the heavy-quark mass. In
this paper we achieve the separation of this perturbative scale from the purely
hadronic effects by matching the QCD LCDA to the convolution of a perturbative
function with the universal, quark-mass independent LCDA defined in heavy-quark
effective theory. This factorization allows to resum potentially large
logarithms between $\Lambda_{\rm QCD}$ and $m_Q$ as well as between $m_Q$ and
the scale $Q$ of the hard process in the production of boosted heavy mesons at
colliders. As an application we derive new theoretical predictions for the
branching ratio of the decay $W^\pm \to B^\pm \gamma$. Furthermore, we provide
phenomenological models for the QCD LCDAs of both the $\bar{B}$ and $D$ mesons
expressed as expansions in Gegenbauer polynomials.
| [
{
"created": "Wed, 10 May 2023 18:19:13 GMT",
"version": "v1"
}
] | 2023-05-12 | [
[
"Beneke",
"Martin",
""
],
[
"Finauri",
"Gael",
""
],
[
"Vos",
"K. Keri",
""
],
[
"Wei",
"Yanbing",
""
]
] | Light-cone distribution amplitudes (LCDAs) frequently arise in factorization theorems involving light and heavy mesons. The QCD LCDA for heavy mesons includes short-distance physics at energy scales of the heavy-quark mass. In this paper we achieve the separation of this perturbative scale from the purely hadronic effects by matching the QCD LCDA to the convolution of a perturbative function with the universal, quark-mass independent LCDA defined in heavy-quark effective theory. This factorization allows to resum potentially large logarithms between $\Lambda_{\rm QCD}$ and $m_Q$ as well as between $m_Q$ and the scale $Q$ of the hard process in the production of boosted heavy mesons at colliders. As an application we derive new theoretical predictions for the branching ratio of the decay $W^\pm \to B^\pm \gamma$. Furthermore, we provide phenomenological models for the QCD LCDAs of both the $\bar{B}$ and $D$ mesons expressed as expansions in Gegenbauer polynomials. |
hep-ph/9210263 | null | I. Sarcevic | Intermittency and Multidimensional Correlations | 10 pp, 4 figs (available on request), University of Arizona preprint
AZPH-TH/92-34, Invited talk presented at VII International Symposium on Very
High Energy Cosmic Ray Interactions, June 22-27, 1992, Ann Arbor | null | 10.1063/1.43803 | null | hep-ph | null | We review recent experimental results on intermittency and multidimensional
particle correlations in high-energy leptonic, hadronic and nuclear collisions.
We discuss different theoretical models, including self-similar cascading and
QCD parton showers, models with phase transitions and the three-dimensional
statistical field theory for multiparticle density fluctuations.
| [
{
"created": "Mon, 26 Oct 1992 23:24:07 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Sarcevic",
"I.",
""
]
] | We review recent experimental results on intermittency and multidimensional particle correlations in high-energy leptonic, hadronic and nuclear collisions. We discuss different theoretical models, including self-similar cascading and QCD parton showers, models with phase transitions and the three-dimensional statistical field theory for multiparticle density fluctuations. |
hep-ph/9501219 | Jonathan Engel | J. Engel, P.I. Krastev, K. Lande | What Can Be Learned with an Iodine Solar-Neutrino Detector? | 8 pages, RevTex, 2 uuencoded figures, submittted to Phys. Rev. D | Phys.Rev.C51:2837-2840,1995 | 10.1103/PhysRevC.51.2837 | IFP-472-UNC | hep-ph | null | We study the potential benefits of an iodine-based solar-neutrino detector
for testing hypotheses that involve neutrino oscillations. We argue that such a
detector will have a good chance of distinguishing the two allowed regions of
$\Delta m^2$ -- $\sin^22\theta$ parameter space if neutrino conversion is
occurring in the sun. It should also be able to detect seasonal variations in
the signal due to vacuum oscillations and might be sensitive enough to detect
day/night variations due to MSW transitions in the earth. Although it would
need to be calibrated, a working iodine detector could be completed before more
ambitious projects that seek to accomplish the same things.
| [
{
"created": "Thu, 5 Jan 1995 22:16:33 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Engel",
"J.",
""
],
[
"Krastev",
"P. I.",
""
],
[
"Lande",
"K.",
""
]
] | We study the potential benefits of an iodine-based solar-neutrino detector for testing hypotheses that involve neutrino oscillations. We argue that such a detector will have a good chance of distinguishing the two allowed regions of $\Delta m^2$ -- $\sin^22\theta$ parameter space if neutrino conversion is occurring in the sun. It should also be able to detect seasonal variations in the signal due to vacuum oscillations and might be sensitive enough to detect day/night variations due to MSW transitions in the earth. Although it would need to be calibrated, a working iodine detector could be completed before more ambitious projects that seek to accomplish the same things. |
1712.08613 | Greger Torgrimsson | Greger Torgrimsson, Christian Schneider, Ralf Sch\"utzhold | Sauter-Schwinger pair creation dynamically assisted by a plane wave | 8 pages, 4 figures | Phys. Rev. D 97, 096004 (2018) | 10.1103/PhysRevD.97.096004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study electron-positron pair creation by a strong and constant electric
field superimposed with a weaker transversal plane wave which is incident
perpendicularly (or under some angle). Comparing the fully non-perturbative
approach based on the world-line instanton method with a perturbative expansion
into powers of the strength of the weaker plane wave, we find good agreement -
provided that the latter is carried out to sufficiently high orders. As usual
for the dynamically assisted Sauter-Schwinger effect, the additional plane wave
induces an exponential enhancement of the pair-creation probability if the
combined Keldysh parameter exceeds a certain threshold.
| [
{
"created": "Fri, 22 Dec 2017 18:53:33 GMT",
"version": "v1"
}
] | 2018-05-16 | [
[
"Torgrimsson",
"Greger",
""
],
[
"Schneider",
"Christian",
""
],
[
"Schützhold",
"Ralf",
""
]
] | We study electron-positron pair creation by a strong and constant electric field superimposed with a weaker transversal plane wave which is incident perpendicularly (or under some angle). Comparing the fully non-perturbative approach based on the world-line instanton method with a perturbative expansion into powers of the strength of the weaker plane wave, we find good agreement - provided that the latter is carried out to sufficiently high orders. As usual for the dynamically assisted Sauter-Schwinger effect, the additional plane wave induces an exponential enhancement of the pair-creation probability if the combined Keldysh parameter exceeds a certain threshold. |
hep-ph/9701325 | null | R. Arnowitt, Pran Nath | Detecting Physics At The Post-GUT And String Scales By Linear Colliders | Latex, 21 pages, no figures | Phys.Rev.D56:2833-2841,1997 | 10.1103/PhysRevD.56.2833 | CTP-TAMU-2/97, NUB-TH-3152/97 | hep-ph hep-ex hep-th | null | The ability of linear colliders to test physics at the post-GUT scale is
investigated. Using current estimates of measurements available at such
accelerators, it is seen that soft breaking masses can be measured with errors
of about (1-20)%. Three classes of models in the post-GUT region are examined:
models with universal soft breaking masses at the string scale, models with
horizontal symmetry, and string models with Calabi-Yau compactifications. In
each case, linear colliders would be able to test directly theoretical
assumptions made at energies beyond the GUT scale to a good accuracy,
distinguish between different models, and measure parameters that are expected
to be predictions of string models.
| [
{
"created": "Fri, 17 Jan 1997 21:53:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arnowitt",
"R.",
""
],
[
"Nath",
"Pran",
""
]
] | The ability of linear colliders to test physics at the post-GUT scale is investigated. Using current estimates of measurements available at such accelerators, it is seen that soft breaking masses can be measured with errors of about (1-20)%. Three classes of models in the post-GUT region are examined: models with universal soft breaking masses at the string scale, models with horizontal symmetry, and string models with Calabi-Yau compactifications. In each case, linear colliders would be able to test directly theoretical assumptions made at energies beyond the GUT scale to a good accuracy, distinguish between different models, and measure parameters that are expected to be predictions of string models. |
hep-ph/0403231 | Tetsuya Shiromizu | Tetsuya Shiromizu, Kazuya Koyama | Spacetime dynamics and baryogenesis in braneworld | 8 pages, references added | JCAP 0407 (2004) 011 | 10.1088/1475-7516/2004/07/011 | null | hep-ph gr-qc hep-th | null | We point out that the effective theory for the Randall-Sundrum braneworld
models with bulk fields contains the baryon number violation process depending
on the spacetime dynamics. Combining to the curvature-current interaction, the
net baryon number observed today may be explained. The resultant baryon to
entropy ratio is determined by the ratio of the Planck scales in four
dimensional and five dimensional spacetime except for the parameter for CP
violation.
| [
{
"created": "Mon, 22 Mar 2004 14:09:00 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2004 01:17:28 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Koyama",
"Kazuya",
""
]
] | We point out that the effective theory for the Randall-Sundrum braneworld models with bulk fields contains the baryon number violation process depending on the spacetime dynamics. Combining to the curvature-current interaction, the net baryon number observed today may be explained. The resultant baryon to entropy ratio is determined by the ratio of the Planck scales in four dimensional and five dimensional spacetime except for the parameter for CP violation. |
2108.11929 | Nejc Ko\v{s}nik | Nejc Ko\v{s}nik, Aleks Smolkovi\v{c} | LFU and CP violation with $S_3$ | 7 pages, 3 figures, v2: added references, additional comments | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce the CP violating scalar leptoquark $S_3$ to explain the measured
values of the lepton universality ratios $R_{K^{(*)}}$. We derive constraints
on the CP-even and CP-odd components of the leptoquark Yukawa couplings
stemming from effects in $b \to s \mu \mu$ and $B_s$ mixing. For the $b \to s
\mu \mu$ processes we impose $R_{K^{(*)}}$, $\mathcal{B}(B_s \to \mu^+ \mu^-)$,
as well as CP-sensitive angular asymmetries $A_{7,8,9}$, whereas in the $B_s$
mixing sector $\Delta M_s$ and $S_{\psi\phi}$ are considered. Combining the
constraints within the $S_3$ model reveals that a large CP phase with a
definite sign is perfectly viable for a leptoquark of mass below a few TeV. For
larger mass of the $S_3$ leptoquark the CP phase is suppressed due to the
observables pertaining to the $B_s$ system. We provide predictions of direct
and mixing-induced CP asymmetries in $B \to K \mu \mu$ that could reveal the
presence of the novel CP phase.
| [
{
"created": "Thu, 26 Aug 2021 17:32:31 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2021 13:22:22 GMT",
"version": "v2"
}
] | 2021-09-10 | [
[
"Košnik",
"Nejc",
""
],
[
"Smolkovič",
"Aleks",
""
]
] | We introduce the CP violating scalar leptoquark $S_3$ to explain the measured values of the lepton universality ratios $R_{K^{(*)}}$. We derive constraints on the CP-even and CP-odd components of the leptoquark Yukawa couplings stemming from effects in $b \to s \mu \mu$ and $B_s$ mixing. For the $b \to s \mu \mu$ processes we impose $R_{K^{(*)}}$, $\mathcal{B}(B_s \to \mu^+ \mu^-)$, as well as CP-sensitive angular asymmetries $A_{7,8,9}$, whereas in the $B_s$ mixing sector $\Delta M_s$ and $S_{\psi\phi}$ are considered. Combining the constraints within the $S_3$ model reveals that a large CP phase with a definite sign is perfectly viable for a leptoquark of mass below a few TeV. For larger mass of the $S_3$ leptoquark the CP phase is suppressed due to the observables pertaining to the $B_s$ system. We provide predictions of direct and mixing-induced CP asymmetries in $B \to K \mu \mu$ that could reveal the presence of the novel CP phase. |
hep-ph/9509295 | Samuel Wallon | S. Wallon | Unified QCD evolution equations for quarks and gluons | 3 pages, latex file, no figures, requires qcdparis.sty; Contribution
to the PARIS Workshop DIS 95',April 19-24,1995 | null | null | Saclay preprint SPhT T95/109 | hep-ph | null | Considering the BFKL and DGLAP QCD evolution equations for structure
functions, we discuss the possibility of unifying them in the whole $x$ and
$Q^2$ range. We emphasize that the main problem is related to the constraint of
angular ordering of the radiation, and the cancellation of the related
collinear singularities for inclusive processes. At the leading log\ $1/x$ and
log\ $Q^2$ level, we write down a unified system of equations satisfying this
cancellation constraint. At low $x$, it leads to a less singular behaviour of
the structure functions than the BFKL prediction.
| [
{
"created": "Thu, 14 Sep 1995 14:05:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wallon",
"S.",
""
]
] | Considering the BFKL and DGLAP QCD evolution equations for structure functions, we discuss the possibility of unifying them in the whole $x$ and $Q^2$ range. We emphasize that the main problem is related to the constraint of angular ordering of the radiation, and the cancellation of the related collinear singularities for inclusive processes. At the leading log\ $1/x$ and log\ $Q^2$ level, we write down a unified system of equations satisfying this cancellation constraint. At low $x$, it leads to a less singular behaviour of the structure functions than the BFKL prediction. |
1007.4074 | A. Tawfik | A. Tawfik (Egyptian Ctr. Theor. Phys., Cairo) | Phase Space and Dynamical Fluctuations of Kaon--to--Pion Ratios | 9 pages (revtex4), 2 eps figure | Prog.Theor.Phys.126:279-292,2011 | 10.1143/PTP.126.279 | ECPT-2010-05 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamical fluctuations of kaon--to--pion ratios have been studied over a
wide range of center--of--mass energies $\sqrt{s}$. Based on changing phase
space volume which apparently is the consequence of phase transition from
hadrons to quark--gluon plasma at large $\sqrt{s}$, single--particle
distribution function $f$ is assumed to be rather modified. Varying $f$ and
phase space volume are implemented in the grand--canonical partition function,
especially at large $\sqrt{s}$, so that hadron resonance gas model, when taking
into account the experimental acceptance and quark phase space occupation
factor, turns to be able to reproduce the dynamical fluctuations over the
entire range of $\sqrt{s}$.
| [
{
"created": "Fri, 23 Jul 2010 09:00:16 GMT",
"version": "v1"
}
] | 2011-10-03 | [
[
"Tawfik",
"A.",
"",
"Egyptian Ctr. Theor. Phys., Cairo"
]
] | The dynamical fluctuations of kaon--to--pion ratios have been studied over a wide range of center--of--mass energies $\sqrt{s}$. Based on changing phase space volume which apparently is the consequence of phase transition from hadrons to quark--gluon plasma at large $\sqrt{s}$, single--particle distribution function $f$ is assumed to be rather modified. Varying $f$ and phase space volume are implemented in the grand--canonical partition function, especially at large $\sqrt{s}$, so that hadron resonance gas model, when taking into account the experimental acceptance and quark phase space occupation factor, turns to be able to reproduce the dynamical fluctuations over the entire range of $\sqrt{s}$. |
1501.04073 | Luis Alvarez-Ruso | Xiulei Ren, E. Oset, L. Alvarez-Ruso, M. J. Vicente Vacas | Antineutrino induced Lambda(1405) production off the proton | 13 pages and 9 figures. Minor revision; a discussion about lQCD
results added to the Introduction | Phys. Rev. C 91, 045201 (2015) | 10.1103/PhysRevC.91.045201 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the strangeness changing antineutrino induced reactions
$\bar{\nu}_{l} p \rightarrow l^+ \phi B $, with $\phi B = K^-p$, $\bar{K}^0n$,
$\pi^0\Lambda$, $\pi^0\Sigma^0$, $\eta\Lambda$, $\eta\Sigma^0$,
$\pi^+\Sigma^-$, $\pi^-\Sigma^+$, $K^+\Xi^-$ and $K^0\Xi^0$, using a chiral
unitary approach. These ten coupled channels are allowed to interact strongly,
using a kernel derived from the chiral Lagrangians. This interaction generates
two $\Lambda(1405)$ poles, leading to a clear single peak in the $\pi \Sigma$
invariant mass distributions. At backward scattering angles in the center of
mass frame, $\bar{\nu}_{\mu} p \rightarrow \mu^+ \pi^0 \Sigma^0$ is dominated
by the $\Lambda(1405)$ state at around 1420~MeV while the lighter state becomes
relevant as the angle decreases, leading to an asymmetric line shape. In
addition, there are substantial differences in the shape of $\pi \Sigma$
invariant mass distributions for the three charge channels. If observed, these
differences would provide valuable information on a claimed isospin I=1,
strangeness S=-1 baryonic state around 1400 MeV. Integrated cross sections have
been obtained for the $\pi \Sigma$ and $\bar K N$ channels, investigating the
impact of unitarization in the results. The number of events with
$\Lambda(1405)$ excitation in $\bar\nu_\mu p$ collisions in the recent
antineutrino run at the MINERvA experiment has also been obtained. We find that
this reaction channel is relevant enough to be investigated experimentally and
to be taken into account in the simulation models of future experiments with
antineutrino beams.
| [
{
"created": "Fri, 16 Jan 2015 18:20:30 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Apr 2015 18:31:31 GMT",
"version": "v2"
}
] | 2015-04-16 | [
[
"Ren",
"Xiulei",
""
],
[
"Oset",
"E.",
""
],
[
"Alvarez-Ruso",
"L.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] | We have studied the strangeness changing antineutrino induced reactions $\bar{\nu}_{l} p \rightarrow l^+ \phi B $, with $\phi B = K^-p$, $\bar{K}^0n$, $\pi^0\Lambda$, $\pi^0\Sigma^0$, $\eta\Lambda$, $\eta\Sigma^0$, $\pi^+\Sigma^-$, $\pi^-\Sigma^+$, $K^+\Xi^-$ and $K^0\Xi^0$, using a chiral unitary approach. These ten coupled channels are allowed to interact strongly, using a kernel derived from the chiral Lagrangians. This interaction generates two $\Lambda(1405)$ poles, leading to a clear single peak in the $\pi \Sigma$ invariant mass distributions. At backward scattering angles in the center of mass frame, $\bar{\nu}_{\mu} p \rightarrow \mu^+ \pi^0 \Sigma^0$ is dominated by the $\Lambda(1405)$ state at around 1420~MeV while the lighter state becomes relevant as the angle decreases, leading to an asymmetric line shape. In addition, there are substantial differences in the shape of $\pi \Sigma$ invariant mass distributions for the three charge channels. If observed, these differences would provide valuable information on a claimed isospin I=1, strangeness S=-1 baryonic state around 1400 MeV. Integrated cross sections have been obtained for the $\pi \Sigma$ and $\bar K N$ channels, investigating the impact of unitarization in the results. The number of events with $\Lambda(1405)$ excitation in $\bar\nu_\mu p$ collisions in the recent antineutrino run at the MINERvA experiment has also been obtained. We find that this reaction channel is relevant enough to be investigated experimentally and to be taken into account in the simulation models of future experiments with antineutrino beams. |
0910.4771 | Mikhail Zubkov | M.A.Zubkov | A superstructure over the Farhi - Susskind Technicolor model | LATEX, to appear in Mod.Phys.Lett.A | Mod. Phys. Lett. A25:679-689,2010 | 10.1142/S0217732310032822 | ITEP-LAT/2009-16 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest the model with the gauge group $ ... \otimes SU(6) \otimes
SU(5)\otimes SU(4) \otimes SU(3) \otimes SU(2) \otimes U(1)$. This group is the
infinite continuation of the gauge group $SU(4) \otimes SU(3) \otimes SU(2)
\otimes U(1)$ of Farhi - Susskind model. The constructed model contains
fermions from the fundamental representations of any SU(N) subgroups of the
gauge group. In the construction of the model we use essentially the
requirement that it posseses an additional discrete symmetry $\cal Z$ that is
the continuation of the $Z_6$ symmetry of the Standard Model. It has been found
that there exists such a choice of the hypercharges of the fermions that the
chiral anomaly is absent while the symmetry $\cal Z$ is preserved.
| [
{
"created": "Sun, 25 Oct 2009 21:24:30 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2009 12:36:30 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Nov 2009 19:09:06 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Feb 2010 14:37:34 GMT",
"version": "v4"
}
] | 2014-11-20 | [
[
"Zubkov",
"M. A.",
""
]
] | We suggest the model with the gauge group $ ... \otimes SU(6) \otimes SU(5)\otimes SU(4) \otimes SU(3) \otimes SU(2) \otimes U(1)$. This group is the infinite continuation of the gauge group $SU(4) \otimes SU(3) \otimes SU(2) \otimes U(1)$ of Farhi - Susskind model. The constructed model contains fermions from the fundamental representations of any SU(N) subgroups of the gauge group. In the construction of the model we use essentially the requirement that it posseses an additional discrete symmetry $\cal Z$ that is the continuation of the $Z_6$ symmetry of the Standard Model. It has been found that there exists such a choice of the hypercharges of the fermions that the chiral anomaly is absent while the symmetry $\cal Z$ is preserved. |
1901.06127 | Jyotsna Singh | Anupam Yadav, Sabeeha Naaz, Jyotsna Singh and R.B. Singh | Neutrino Oscillations and Leptogenesis | 15 pages, 5 figures | null | 10.37896/jxu14.5/387 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The symmetry breaking of left right symmetric model around few TeV range
permits the existence of massive right handed neutrinos or gauge bosons. In
this work the decay of lightest right handed neutrinos in a class of minimal
left right symmetric model is analysed for the generation of adequate lepton
asymmetry. An analytical expression for the lepton asymmetry is developed. In
an attempt to achieve the required baryogenesis, we have imposed certain
constrains on the parameter space corresponding to low energy neutrino
oscillation parameters (especially {\theta} 13 ) and the three phases ( CP,
majorana and higher energy phase).
| [
{
"created": "Fri, 18 Jan 2019 08:40:46 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2019 07:46:52 GMT",
"version": "v2"
}
] | 2020-10-06 | [
[
"Yadav",
"Anupam",
""
],
[
"Naaz",
"Sabeeha",
""
],
[
"Singh",
"Jyotsna",
""
],
[
"Singh",
"R. B.",
""
]
] | The symmetry breaking of left right symmetric model around few TeV range permits the existence of massive right handed neutrinos or gauge bosons. In this work the decay of lightest right handed neutrinos in a class of minimal left right symmetric model is analysed for the generation of adequate lepton asymmetry. An analytical expression for the lepton asymmetry is developed. In an attempt to achieve the required baryogenesis, we have imposed certain constrains on the parameter space corresponding to low energy neutrino oscillation parameters (especially {\theta} 13 ) and the three phases ( CP, majorana and higher energy phase). |
hep-ph/0209165 | Andrei Kataev | S.I. Alekhin (Institute of High Energy Physics, Protvino, Russia),
A.L. Kataev (Instute for Nuclear Research of the Academy of Sciences of
Russia, Moscow, Russia) | QCD effects to Bjorken unpolarized sum rule for $\nu N$ deep-inelastic
scattering | 3 pages, presented at 4th NuFact'02 Workshop (Neutrino Factories
based on Muon Storage Rings), London, England, 1-6 July 2002 | J.Phys.G29:1993-1996,2003 | 10.1088/0954-3899/29/8/388 | null | hep-ph | null | The possibility of the first measurement of Bjorken unpolarized sum rule for
$F_1$ structure function of $\nu N$ deep-inelastic scattering at Neutrino
Factories is commented. The brief summary of various theoretical contributions
to this sum rule is given. Using the next-to-leading set of parton
distributions functions, we simulate the expected $Q^2$-behavior and emphasize
that its measurement can allow to determine the value of the QCD strong
coupling constant $\alpha_s$ with reasonable theoretical uncertainty, dominated
by the ambiguity in the existing estimates of the twist-4 non-perturbative
$1/Q^2$-effect.
| [
{
"created": "Sun, 15 Sep 2002 12:15:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alekhin",
"S. I.",
"",
"Institute of High Energy Physics, Protvino, Russia"
],
[
"Kataev",
"A. L.",
"",
"Instute for Nuclear Research of the Academy of Sciences of\n Russia, Moscow, Russia"
]
] | The possibility of the first measurement of Bjorken unpolarized sum rule for $F_1$ structure function of $\nu N$ deep-inelastic scattering at Neutrino Factories is commented. The brief summary of various theoretical contributions to this sum rule is given. Using the next-to-leading set of parton distributions functions, we simulate the expected $Q^2$-behavior and emphasize that its measurement can allow to determine the value of the QCD strong coupling constant $\alpha_s$ with reasonable theoretical uncertainty, dominated by the ambiguity in the existing estimates of the twist-4 non-perturbative $1/Q^2$-effect. |
1009.4129 | Skokov Vladimir | K. Redlich, B. Friman, and V. Skokov | The influence of fluctuations on thermodynamics near chiral phase
transition | Invited talk at "New Frontiers in QCD 2010", Kyoto, Japan; to appear
in Prog. of Theor. Phys | Prog.Theor.Phys.Suppl.186:485-490,2010 | 10.1143/PTPS.186.485 | CERN-PH-TH-2010-209 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the influence of fluctuations on thermodynamics near the chiral
phase transition within Polyakov loop extended quark--meson model based on the
functional renormalization group (FRG) method. We include the gluon fields in
the FRG flow equation self-consistently on the mean-field level. We focus on
the properties of the phase diagram and net-baryon number fluctuations.
| [
{
"created": "Tue, 21 Sep 2010 16:04:01 GMT",
"version": "v1"
}
] | 2011-03-10 | [
[
"Redlich",
"K.",
""
],
[
"Friman",
"B.",
""
],
[
"Skokov",
"V.",
""
]
] | We discuss the influence of fluctuations on thermodynamics near the chiral phase transition within Polyakov loop extended quark--meson model based on the functional renormalization group (FRG) method. We include the gluon fields in the FRG flow equation self-consistently on the mean-field level. We focus on the properties of the phase diagram and net-baryon number fluctuations. |
0805.0293 | Joseph Schechter | Renata Jora, Sherif Moussa, Salah Nasri, Joseph Schechter and M. Naeem
Shahid | Simple two Higgs doublet model | more references and explanation | Int.J.Mod.Phys.A23:5159-5172,2008 | 10.1142/S0217751X08042614 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a simple two Higgs doublet model which reflects, in a
phenomenological way, the idea of compositeness for the Higgs sector. It is
relatively predictive. In one scenario, it allows for a "hidden" usual Higgs
particle in the 100 GeV region and a possible dark matter candidate.
| [
{
"created": "Fri, 2 May 2008 19:18:18 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Oct 2008 20:34:38 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jul 2009 21:52:18 GMT",
"version": "v3"
}
] | 2009-07-24 | [
[
"Jora",
"Renata",
""
],
[
"Moussa",
"Sherif",
""
],
[
"Nasri",
"Salah",
""
],
[
"Schechter",
"Joseph",
""
],
[
"Shahid",
"M. Naeem",
""
]
] | We study a simple two Higgs doublet model which reflects, in a phenomenological way, the idea of compositeness for the Higgs sector. It is relatively predictive. In one scenario, it allows for a "hidden" usual Higgs particle in the 100 GeV region and a possible dark matter candidate. |
2106.00025 | Danny Marfatia | Pasquale Di Bari, Danny Marfatia, Ye-Ling Zhou | Gravitational waves from first-order phase transitions in Majoron models
of neutrino mass | 37 pages, 8 figures, 5 tables. Version to appear in JHEP | JHEP 2110:193 (2021) | 10.1007/JHEP10(2021)193 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how the generation of right-handed neutrino masses in Majoron models
may be associated with a first-order phase transition and accompanied by the
production of a stochastic background of gravitational waves (GWs). We explore
different energy scales with only renormalizable operators in the effective
potential. If the phase transition occurs above the electroweak scale, the
signal can be tested by future interferometers. We consider two possible energy
scales for phase transitions below the electroweak scale. If the phase
transition occurs at a GeV, the signal can be tested at LISA and provide a
complementary cosmological probe to right-handed neutrino searches at the FASER
detector. If the phase transition occurs below 100 keV, we find that the peak
of the GW spectrum is two or more orders of magnitude below the putative
NANOGrav GW signal at low frequencies, but well within reach of the SKA and
THEIA experiments. We show how searches of very low frequency GWs are motivated
by solutions to the Hubble tension in which ordinary neutrinos interact with
the dark sector. We also present general calculations of the phase transition
temperature and Euclidean action that apply beyond Majoron models.
| [
{
"created": "Mon, 31 May 2021 18:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 17:17:07 GMT",
"version": "v2"
}
] | 2021-10-28 | [
[
"Di Bari",
"Pasquale",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] | We show how the generation of right-handed neutrino masses in Majoron models may be associated with a first-order phase transition and accompanied by the production of a stochastic background of gravitational waves (GWs). We explore different energy scales with only renormalizable operators in the effective potential. If the phase transition occurs above the electroweak scale, the signal can be tested by future interferometers. We consider two possible energy scales for phase transitions below the electroweak scale. If the phase transition occurs at a GeV, the signal can be tested at LISA and provide a complementary cosmological probe to right-handed neutrino searches at the FASER detector. If the phase transition occurs below 100 keV, we find that the peak of the GW spectrum is two or more orders of magnitude below the putative NANOGrav GW signal at low frequencies, but well within reach of the SKA and THEIA experiments. We show how searches of very low frequency GWs are motivated by solutions to the Hubble tension in which ordinary neutrinos interact with the dark sector. We also present general calculations of the phase transition temperature and Euclidean action that apply beyond Majoron models. |
1510.02517 | Anatoly Radyushkin | A. V. Radyushkin | Virtuality and Transverse Momentum Dependence of Pion Distribution
Amplitude | 34 pages, a few typos fixed | Phys. Rev. D 93, 056002 (2016) | 10.1103/PhysRevD.93.056002 | JLAB-THY-15-2145 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe basics of a new approach to transverse momentum dependence in
hard exclusive processes. We develop it in application to the transition
process \gamma^* \gamma -> \pi^0 at the handbag level. Our starting point is
coordinate representation for matrix elements of operators (in the simplest
case, bilocal O (0,z) ) describing a hadron with momentum p. Treated as
functions of (pz) and z^2, they are parametrized through virtuality
distribution amplitudes (VDA) \Phi (x, \sigma), with x being Fourier-conjugate
to (pz) and \sigma Laplace-conjugate to z^2. For intervals with z^+=0, we
introduce the transverse momentum distribution amplitude (TMDA) \Psi (x,
k_\perp), and write it in terms of VDA \Phi (x, \sigma). The results of
covariant calculations, written in terms of \Phi (x, \sigma) are converted into
expressions involving \Psi (x, k_\perp). Starting with scalar toy models, we
extend the analysis onto the case of spin-1/2 quarks and QCD. We propose simple
models for soft VDAs/TMDAs, and use them for comparison of handbag results with
experimental (BaBar and BELLE) data on the pion transition form factor. We also
discuss how one can generate high-k_\perp tails from primordial soft
distributions.
| [
{
"created": "Thu, 8 Oct 2015 21:32:08 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2015 17:45:43 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Radyushkin",
"A. V.",
""
]
] | We describe basics of a new approach to transverse momentum dependence in hard exclusive processes. We develop it in application to the transition process \gamma^* \gamma -> \pi^0 at the handbag level. Our starting point is coordinate representation for matrix elements of operators (in the simplest case, bilocal O (0,z) ) describing a hadron with momentum p. Treated as functions of (pz) and z^2, they are parametrized through virtuality distribution amplitudes (VDA) \Phi (x, \sigma), with x being Fourier-conjugate to (pz) and \sigma Laplace-conjugate to z^2. For intervals with z^+=0, we introduce the transverse momentum distribution amplitude (TMDA) \Psi (x, k_\perp), and write it in terms of VDA \Phi (x, \sigma). The results of covariant calculations, written in terms of \Phi (x, \sigma) are converted into expressions involving \Psi (x, k_\perp). Starting with scalar toy models, we extend the analysis onto the case of spin-1/2 quarks and QCD. We propose simple models for soft VDAs/TMDAs, and use them for comparison of handbag results with experimental (BaBar and BELLE) data on the pion transition form factor. We also discuss how one can generate high-k_\perp tails from primordial soft distributions. |
2007.06940 | Yehonatan Viernik | Elina Fuchs, Marta Losada, Yosef Nir, Yehonatan Viernik | Analytic Techniques for Solving the Transport Equations in Electroweak
Baryogenesis | 23 pages + 3 appendices, 9 figures, 4 tables | null | 10.1007/JHEP07(2021)060 | FERMILAB-PUB-20-202-T, EFI-20-12 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop an efficient method for solving transport equations, particularly
in the context of electroweak baryogenesis. It provides fully-analytical
results under mild approximations and can also test semi-analytical results,
which are applicable in more general cases. Key elements of our method include
the reduction of the second-order differential equations to first order,
representing the set of coupled equations as a block matrix of the particle
densities and their derivatives, identification of zero modes, and block
decomposition of the matrix. We apply our method to calculate the baryon
asymmetry of the Universe (BAU) in a Standard Model effective field theory
framework of complex Yukawa couplings to determine the sensitivity of the
resulting BAU to modifications of various model parameters and rates, and to
estimate the effect of the commonly-used thin-wall approximation.
| [
{
"created": "Tue, 14 Jul 2020 09:55:14 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2020 18:08:29 GMT",
"version": "v2"
}
] | 2021-07-28 | [
[
"Fuchs",
"Elina",
""
],
[
"Losada",
"Marta",
""
],
[
"Nir",
"Yosef",
""
],
[
"Viernik",
"Yehonatan",
""
]
] | We develop an efficient method for solving transport equations, particularly in the context of electroweak baryogenesis. It provides fully-analytical results under mild approximations and can also test semi-analytical results, which are applicable in more general cases. Key elements of our method include the reduction of the second-order differential equations to first order, representing the set of coupled equations as a block matrix of the particle densities and their derivatives, identification of zero modes, and block decomposition of the matrix. We apply our method to calculate the baryon asymmetry of the Universe (BAU) in a Standard Model effective field theory framework of complex Yukawa couplings to determine the sensitivity of the resulting BAU to modifications of various model parameters and rates, and to estimate the effect of the commonly-used thin-wall approximation. |
1009.2555 | John F. Gunion | John F. Gunion (UC, Davis), Alexander V.~Belikov (Chicago), and Dan
Hooper (Fermilab and Chicago) | CoGeNT, DAMA, and Neutralino Dark Matter in the Next-To-Minimal
Supersymmetric Standard Model | 14 pages, 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assess the extent to which the NMSSM can allow for light dark matter in
the $2\gev\lsim \mcnone\lsim 12\gev$ mass range with correct relic density and
large spin-independent direct-detection cross section, $\sigsi$, in the range
suggested by \cogent\ and DAMA. For standard assumptions regarding nucleon
$s$-quark content and cosmological relic density, $\rho$, we find that the
NMSSM falls short by a factor of about 10 to 15 (3 to 5) without (with)
significant violation of the current $(g-2)_\mu$ constraints.
| [
{
"created": "Tue, 14 Sep 2010 02:20:57 GMT",
"version": "v1"
}
] | 2010-09-15 | [
[
"Gunion",
"John F.",
"",
"UC, Davis"
],
[
"~Belikov",
"Alexander V.",
"",
"Chicago"
],
[
"Hooper",
"Dan",
"",
"Fermilab and Chicago"
]
] | We assess the extent to which the NMSSM can allow for light dark matter in the $2\gev\lsim \mcnone\lsim 12\gev$ mass range with correct relic density and large spin-independent direct-detection cross section, $\sigsi$, in the range suggested by \cogent\ and DAMA. For standard assumptions regarding nucleon $s$-quark content and cosmological relic density, $\rho$, we find that the NMSSM falls short by a factor of about 10 to 15 (3 to 5) without (with) significant violation of the current $(g-2)_\mu$ constraints. |
2406.05266 | Michael Shamma | David McKeen, John Ng, Michael Shamma | Signatures of Bulk Neutrinos in the Early Universe | 15 pages, 2 figures | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Neutrino masses and quantum gravity are strong reasons to extend the standard
model of particle physics. A large extra dimension can be motivated by quantum
gravity and can explain the small neutrino masses with new singlet states that
propagate in the bulk. In such a case, a Kaluza-Klein tower of sterile
neutrinos emerges. We revisit constraints on towers of sterile neutrinos that
come from cosmological observables such as the effective number of
noninteracting relativistic species and the dark matter density. These limits
generically rule out micron-sized extra dimensions. We explore the weakening of
these constraints to accommodate an extra dimension close to the micron size by
assuming that the universe reheated after inflation to a low temperature. We
discuss how such a possibility can be distinguished in the event of a positive
signal in a cosmological observable.
| [
{
"created": "Fri, 7 Jun 2024 21:26:00 GMT",
"version": "v1"
}
] | 2024-06-11 | [
[
"McKeen",
"David",
""
],
[
"Ng",
"John",
""
],
[
"Shamma",
"Michael",
""
]
] | Neutrino masses and quantum gravity are strong reasons to extend the standard model of particle physics. A large extra dimension can be motivated by quantum gravity and can explain the small neutrino masses with new singlet states that propagate in the bulk. In such a case, a Kaluza-Klein tower of sterile neutrinos emerges. We revisit constraints on towers of sterile neutrinos that come from cosmological observables such as the effective number of noninteracting relativistic species and the dark matter density. These limits generically rule out micron-sized extra dimensions. We explore the weakening of these constraints to accommodate an extra dimension close to the micron size by assuming that the universe reheated after inflation to a low temperature. We discuss how such a possibility can be distinguished in the event of a positive signal in a cosmological observable. |
hep-ph/0209354 | XiaoHu Mo | BES Collaboration : J.Z.Bai, et al | A Measurement of Psi(2S) Resonance Parameters | 8 pages, 6 figures | Phys.Lett.B550:24-32,2002 | 10.1016/S0370-2693(02)02909-X | null | hep-ph hep-ex | null | Cross sections for e+e- to hadons, pi+pi- J/Psi, and mu+mu- have been
measured in the vicinity of the Psi(2S) resonance using the BESII detector
operated at the BEPC. The Psi(2S) total width; partial widths to hadrons,
pi+pi- J/Psi, muons; and corresponding branching fractions have been determined
to be Gamma(total)= (264+-27) keV; Gamma(hadron)= (258+-26) keV, Gamma(mu)=
(2.44+-0.21) keV, and Gamma(pi+pi- J/Psi)= (85+-8.7) keV; and Br(hadron)=
(97.79+-0.15)%, Br(pi+pi- J/Psi)= (32+-1.4)%, Br(mu)= (0.93+-0.08)%,
respectively.
| [
{
"created": "Mon, 30 Sep 2002 04:04:19 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2002 09:29:59 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"BES Collaboration",
"",
""
],
[
"Bai",
"J. Z.",
""
]
] | Cross sections for e+e- to hadons, pi+pi- J/Psi, and mu+mu- have been measured in the vicinity of the Psi(2S) resonance using the BESII detector operated at the BEPC. The Psi(2S) total width; partial widths to hadrons, pi+pi- J/Psi, muons; and corresponding branching fractions have been determined to be Gamma(total)= (264+-27) keV; Gamma(hadron)= (258+-26) keV, Gamma(mu)= (2.44+-0.21) keV, and Gamma(pi+pi- J/Psi)= (85+-8.7) keV; and Br(hadron)= (97.79+-0.15)%, Br(pi+pi- J/Psi)= (32+-1.4)%, Br(mu)= (0.93+-0.08)%, respectively. |
2310.15395 | Elena Pinetti | Ryan Janish, Elena Pinetti | Hunting Dark Matter Lines in the Infrared Background with the James Webb
Space Telescope | 12 pages, 2 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Dark matter particles with a mass around 1 eV can decay into near-infrared
photons. Utilising available public blank sky observations from the NIRSpec IFU
on the James Webb Space Telescope (JWST), we search for a narrow emission line
due to decaying dark matter and derive leading constraints in the mass range
0.8-3 eV on the decay rate to photons, and more specifically, on the
axion-photon coupling for the case of axion-like particles. We exclude $\tau <
6.7\cdot 10^{26}$ s at $m_{\rm DM} \simeq 0.9$ eV and, in the case of axions,
$g_{a \gamma \gamma} > 9.4 \cdot 10^{-12}$ GeV$^{-1}$ for $m_a = 2.15$ eV. Our
results do not rely on dedicated observations, rather we use blank sky
observations intended for sky subtraction, and thus our reach may be
automatically strengthened as JWST continues to observe.
| [
{
"created": "Mon, 23 Oct 2023 22:56:05 GMT",
"version": "v1"
}
] | 2023-10-25 | [
[
"Janish",
"Ryan",
""
],
[
"Pinetti",
"Elena",
""
]
] | Dark matter particles with a mass around 1 eV can decay into near-infrared photons. Utilising available public blank sky observations from the NIRSpec IFU on the James Webb Space Telescope (JWST), we search for a narrow emission line due to decaying dark matter and derive leading constraints in the mass range 0.8-3 eV on the decay rate to photons, and more specifically, on the axion-photon coupling for the case of axion-like particles. We exclude $\tau < 6.7\cdot 10^{26}$ s at $m_{\rm DM} \simeq 0.9$ eV and, in the case of axions, $g_{a \gamma \gamma} > 9.4 \cdot 10^{-12}$ GeV$^{-1}$ for $m_a = 2.15$ eV. Our results do not rely on dedicated observations, rather we use blank sky observations intended for sky subtraction, and thus our reach may be automatically strengthened as JWST continues to observe. |
2110.12918 | Giuseppe Callea | Andy Buckley, Giuseppe Callea, Andrew J. Larkowski, Simone Marzani | Colouring the Higgs boson | ISMD21 conference proceedings | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The jet colour ring is a novel colour tagger observable designed to separate
the decay of a colour-singlet into two jets from a two-jet background in a
different colour configuration. Simulation studies in the case of the
production of a boosted Higgs boson decaying in two b-quarks and an associate
electroweak boson, showed notable discriminator powers when comparing the jet
colour ring performances with other observables. These results are opening a
wide scenario for further studies.
| [
{
"created": "Mon, 25 Oct 2021 12:57:43 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Nov 2021 15:13:17 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jan 2022 14:39:06 GMT",
"version": "v3"
}
] | 2022-01-31 | [
[
"Buckley",
"Andy",
""
],
[
"Callea",
"Giuseppe",
""
],
[
"Larkowski",
"Andrew J.",
""
],
[
"Marzani",
"Simone",
""
]
] | The jet colour ring is a novel colour tagger observable designed to separate the decay of a colour-singlet into two jets from a two-jet background in a different colour configuration. Simulation studies in the case of the production of a boosted Higgs boson decaying in two b-quarks and an associate electroweak boson, showed notable discriminator powers when comparing the jet colour ring performances with other observables. These results are opening a wide scenario for further studies. |
1911.01930 | Hikaru Uchida | Tatsuo Kobayashi, Hajime Otsuka, Hikaru Uchida | Flavor structure of magnetized $T^2/\mathbb{Z}_2$ blow-up models | 16 pages, 5 figures | null | 10.1007/JHEP03(2020)042 | EPHOU-19-0014, KEK-TH-2166 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the flavor structure in a resolutions of magnetized
$T^2/\mathbb{Z}_2$ orbifold models. The flavor structure of Yukawa couplings
among chiral zero-modes is sensitive to radii of the resolved fixed points of
$T^2/\mathbb{Z}_2$ orbifold. We show in concrete models that the realistic mass
hierarchy and mixing angles of the quark sector can be realized at certain
values of blow-up radii, where the number of parameters in the blow-up model
can be smaller than toroidal orbifold one.
| [
{
"created": "Tue, 5 Nov 2019 16:46:41 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2020 08:52:05 GMT",
"version": "v2"
}
] | 2020-04-22 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Otsuka",
"Hajime",
""
],
[
"Uchida",
"Hikaru",
""
]
] | We discuss the flavor structure in a resolutions of magnetized $T^2/\mathbb{Z}_2$ orbifold models. The flavor structure of Yukawa couplings among chiral zero-modes is sensitive to radii of the resolved fixed points of $T^2/\mathbb{Z}_2$ orbifold. We show in concrete models that the realistic mass hierarchy and mixing angles of the quark sector can be realized at certain values of blow-up radii, where the number of parameters in the blow-up model can be smaller than toroidal orbifold one. |
hep-ph/9907313 | Francesco Sannino | Francesco Sannino (Yale University) | Chiral Phase Transition for SU(N) Gauge Theories | 7 pages, LaTeX AIP style. Conf. Proc. "New Directions in Quantum
Chromodynamics" | AIP Conf.Proc.494:329-335,1999 | 10.1063/1.1301680 | YCPT-P19-99 | hep-ph | null | We describe the chiral phase transition for vector-like SU(N) gauge theories
as a function of the number of quark flavors Nf by making use of an
anomaly-induced effective potential. The potential depends explicitly on the
full beta-function and the anomalous dimension \gamma of the quark mass
operator. By using this potential we argue that chiral symmetry is restored for
\gamma <1. A perturbative computation of \gamma then leads to an estimate of
the critical value Nf^c for the transition.
| [
{
"created": "Mon, 12 Jul 1999 18:58:15 GMT",
"version": "v1"
}
] | 2010-12-13 | [
[
"Sannino",
"Francesco",
"",
"Yale University"
]
] | We describe the chiral phase transition for vector-like SU(N) gauge theories as a function of the number of quark flavors Nf by making use of an anomaly-induced effective potential. The potential depends explicitly on the full beta-function and the anomalous dimension \gamma of the quark mass operator. By using this potential we argue that chiral symmetry is restored for \gamma <1. A perturbative computation of \gamma then leads to an estimate of the critical value Nf^c for the transition. |
hep-ph/9302279 | Michelangelo Mangano | Michelangelo MANGANO | On the B and J/Psi Cross Section Measurements at Ua1 and CDF | 16 pages + 8 topdrawer figs included at the end, Latex, IFUP-TH 2/93 | Z.Phys. C58 (1993) 651-658 | 10.1007/BF01553026 | null | hep-ph | null | We analise the implications of the measurement of $B$ and $J/\psi$ inclusive
\pt\ distributions performed in $p\bar p$ collisions by the UA1 and CDF
experiments.
| [
{
"created": "Fri, 19 Feb 1993 13:55:31 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"MANGANO",
"Michelangelo",
""
]
] | We analise the implications of the measurement of $B$ and $J/\psi$ inclusive \pt\ distributions performed in $p\bar p$ collisions by the UA1 and CDF experiments. |
0712.2001 | Roman Nevzorov | S. Hesselbach, D. J. Miller, G. Moortgat-Pick, R. Nevzorov, M. Trusov | Theoretical upper bound on the mass of the LSP in the MNSSM | 15 pages, 2 figures, references added | Phys.Lett.B662:199-207,2008 | 10.1016/j.physletb.2008.02.050 | DCPT-07-188, IPPP-07-94 | hep-ph | null | We study the neutralino sector of the Minimal Non-minimal Supersymmetric
Standard Model (MNSSM) where the $\mu$ problem of the Minimal Supersymmetric
Standard Model (MSSM) is solved without accompanying problems related with the
appearance of domain walls. In the MNSSM as in the MSSM the lightest neutralino
can be the absolutely stable lightest supersymmetric particle (LSP) providing a
good candidate for the cold dark matter component of the Universe. In contrast
with the MSSM the allowed range of the mass of the lightest neutralino in the
MNSSM is limited. We establish the theoretical upper bound on the lightest
neutralino mass in the framework of this model and obtain an approximate
solution for this mass.
| [
{
"created": "Wed, 12 Dec 2007 18:30:32 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2008 20:39:07 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hesselbach",
"S.",
""
],
[
"Miller",
"D. J.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Trusov",
"M.",
""
]
] | We study the neutralino sector of the Minimal Non-minimal Supersymmetric Standard Model (MNSSM) where the $\mu$ problem of the Minimal Supersymmetric Standard Model (MSSM) is solved without accompanying problems related with the appearance of domain walls. In the MNSSM as in the MSSM the lightest neutralino can be the absolutely stable lightest supersymmetric particle (LSP) providing a good candidate for the cold dark matter component of the Universe. In contrast with the MSSM the allowed range of the mass of the lightest neutralino in the MNSSM is limited. We establish the theoretical upper bound on the lightest neutralino mass in the framework of this model and obtain an approximate solution for this mass. |
1009.5353 | Yutaka Sakamura | Yutaka Sakamura | Radion and Higgs masses in gauge-Higgs unification | 20 pages, 3 figures; text modified, references added | Phys.Rev.D83:036007,2011 | 10.1103/PhysRevD.83.036007 | KEK-TH-1402 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the radion and Higgs masses in the gauge-Higgs unification models
on the warped geometry, in which the modulus is stabilized by the Casimir
energy. We analyze the one-loop effective potential and clarify the dependences
of those masses on the Wilson line phase $\theta_H$. The radion mass varies
1-30GeV for $0.06\leq\sin\theta_H\leq 0.3$, while the Higgs mass is 150-200 GeV
and depends on $\theta_H$ only logarithmically. The radion couplings to the
standard model particles are sensitive to the warp factor, and are too small to
detect at colliders in the region where the five-dimensional description is
valid.
| [
{
"created": "Mon, 27 Sep 2010 18:58:22 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Oct 2010 13:55:44 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jan 2011 11:10:07 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Sakamura",
"Yutaka",
""
]
] | We evaluate the radion and Higgs masses in the gauge-Higgs unification models on the warped geometry, in which the modulus is stabilized by the Casimir energy. We analyze the one-loop effective potential and clarify the dependences of those masses on the Wilson line phase $\theta_H$. The radion mass varies 1-30GeV for $0.06\leq\sin\theta_H\leq 0.3$, while the Higgs mass is 150-200 GeV and depends on $\theta_H$ only logarithmically. The radion couplings to the standard model particles are sensitive to the warp factor, and are too small to detect at colliders in the region where the five-dimensional description is valid. |
1906.01805 | Yu-Kuo Hsiao | Y.K. Hsiao, Shang-Yuu Tsai, Chong-Chung Lih and Eduardo Rodrigues | Testing the W-exchange mechanism with two-body baryonic B decays | 12 pages, 1 figure, 3 tables, version published in JHEP | JHEP2004, 035 (2020) | 10.1007/JHEP04(2020)035 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of $W$-exchange diagrams in baryonic $B$ decays is poorly
understood, and often taken as insignificant and neglected. We show that
charmful two-body baryonic $B\to {\bf B}_c \bar {\bf B}'$ decays provide a good
test-bed for the study of the $W$-exchange topology, whose contribution is
found to be non-negligible; here ${\bf B}_c$ is an anti-triplet or a sextet
charmed baryon, and ${\bf \bar B}'$ an octet charmless (anti-)baryon. In
particular, we calculate that ${\cal B}(\bar B^0\to\Sigma_c^{+}\bar
p)=(2.9^{+0.8}_{-0.9})\times 10^{-6}$ in good agreement with the experimental
upper bound. Its cousin $\bar B_s^0$ mode, $\bar B_s^0\to\Lambda^+_c\bar p$, is
a purely $W$-exchange decay, hence is naturally suited for the study of the
role of the $W$-exchange topology. We predict ${\cal B}(\bar
B_s^0\to\Lambda^+_c\bar p)=(0.8\pm 0.3)\times 10^{-6}$, a relatively large
branching ratio to be tested with a future measurement by the LHCb
collaboration. Other predictions, such as ${\cal B}(\bar
B^0\to\Xi_c^+\bar\Sigma^-)=(1.1\pm 0.4)\times 10^{-5}$, can be tested with
future Belle II measurements.
| [
{
"created": "Wed, 5 Jun 2019 03:26:58 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2020 15:48:06 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Hsiao",
"Y. K.",
""
],
[
"Tsai",
"Shang-Yuu",
""
],
[
"Lih",
"Chong-Chung",
""
],
[
"Rodrigues",
"Eduardo",
""
]
] | The role of $W$-exchange diagrams in baryonic $B$ decays is poorly understood, and often taken as insignificant and neglected. We show that charmful two-body baryonic $B\to {\bf B}_c \bar {\bf B}'$ decays provide a good test-bed for the study of the $W$-exchange topology, whose contribution is found to be non-negligible; here ${\bf B}_c$ is an anti-triplet or a sextet charmed baryon, and ${\bf \bar B}'$ an octet charmless (anti-)baryon. In particular, we calculate that ${\cal B}(\bar B^0\to\Sigma_c^{+}\bar p)=(2.9^{+0.8}_{-0.9})\times 10^{-6}$ in good agreement with the experimental upper bound. Its cousin $\bar B_s^0$ mode, $\bar B_s^0\to\Lambda^+_c\bar p$, is a purely $W$-exchange decay, hence is naturally suited for the study of the role of the $W$-exchange topology. We predict ${\cal B}(\bar B_s^0\to\Lambda^+_c\bar p)=(0.8\pm 0.3)\times 10^{-6}$, a relatively large branching ratio to be tested with a future measurement by the LHCb collaboration. Other predictions, such as ${\cal B}(\bar B^0\to\Xi_c^+\bar\Sigma^-)=(1.1\pm 0.4)\times 10^{-5}$, can be tested with future Belle II measurements. |
hep-ph/9903330 | Russel P. Kauffman | Russel P. Kauffman (Muhlenberg), Satish V. Desai (SUNY, Stony Brook),
Dipesh Risal (Rochester) | Amplitudes for Higgs Bosons plus Four Partons | 4 pages, RevTeX, to appear in the proceedings of DPF '99 | null | null | MUHL-PHY/99-1 | hep-ph | null | In this talk we consider amplitudes for processes involving a Higgs boson,
either scalar or pseudoscalar, plus four light partons. These amplitudes are
relevant to the production of a Higgs boson plus two jets in hadronic
collisions. They are also relevant to calculating the transverse momentum
spectrum for Higgs bosons at next-to-leading order in the strong coupling. We
work in the limit that the top quark is much heavier than the Higgs bosons and
use effective Lagrangians for the interactions of gluons with the Higgs bosons.
We present the amplitudes involving a Higgs boson and: 1) four gluons, 2) two
quarks and two gluons; and 3) four quarks. We show that the pseudoscalar
amplitudes are nearly identical to those for the scalar case, the only
differences being the overall size and the relative signs between terms.
| [
{
"created": "Thu, 11 Mar 1999 18:46:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kauffman",
"Russel P.",
"",
"Muhlenberg"
],
[
"Desai",
"Satish V.",
"",
"SUNY, Stony Brook"
],
[
"Risal",
"Dipesh",
"",
"Rochester"
]
] | In this talk we consider amplitudes for processes involving a Higgs boson, either scalar or pseudoscalar, plus four light partons. These amplitudes are relevant to the production of a Higgs boson plus two jets in hadronic collisions. They are also relevant to calculating the transverse momentum spectrum for Higgs bosons at next-to-leading order in the strong coupling. We work in the limit that the top quark is much heavier than the Higgs bosons and use effective Lagrangians for the interactions of gluons with the Higgs bosons. We present the amplitudes involving a Higgs boson and: 1) four gluons, 2) two quarks and two gluons; and 3) four quarks. We show that the pseudoscalar amplitudes are nearly identical to those for the scalar case, the only differences being the overall size and the relative signs between terms. |
hep-ph/0503129 | Dominik Stockinger | Dominik St\"ockinger | Regularization by Dimensional Reduction: Consistency, Quantum Action
Principle, and Supersymmetry | 19 pages, 4 figures; minor modifications, published in JHEP | JHEP0503:076,2005 | 10.1088/1126-6708/2005/03/076 | IPPP/05/06, DCPT/05/12 | hep-ph | null | It is proven by explicit construction that regularization by dimensional
reduction can be formulated in a mathematically consistent way. In this
formulation the quantum action principle is shown to hold. This provides an
intuitive and elegant relation between the D-dimensional Lagrangian and Ward or
Slavnov-Taylor identities, and it can be used in particular to study to what
extent dimensional reduction preserves supersymmetry. We give several examples
of previously unchecked cases.
| [
{
"created": "Mon, 14 Mar 2005 17:37:16 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2005 15:11:46 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Sep 2005 12:14:00 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Stöckinger",
"Dominik",
""
]
] | It is proven by explicit construction that regularization by dimensional reduction can be formulated in a mathematically consistent way. In this formulation the quantum action principle is shown to hold. This provides an intuitive and elegant relation between the D-dimensional Lagrangian and Ward or Slavnov-Taylor identities, and it can be used in particular to study to what extent dimensional reduction preserves supersymmetry. We give several examples of previously unchecked cases. |
1602.01465 | Jordan Smolinsky | Jonathan L. Feng, Jordan Smolinsky, Philip Tanedo | Dark Sunshine: Detecting Dark Matter through Dark Photons from the Sun | 31 Pages, 10 Figures. v2: minor revisions to match published version;
v3: updated direct detection and CMB constraints and corrected decay length
in code, moving the region of experimental sensitivity to values of epsilon
that are lower by an order of magnitude | Phys. Rev. D 93, 115036 (2016) | 10.1103/PhysRevD.93.115036 | UCI-TR-2016-02 | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter may interact with the Standard Model through the kinetic mixing
of dark photons, $A'$, with Standard Model photons. Such dark matter will
accumulate in the Sun and annihilate into dark photons. The dark photons may
then leave the Sun and decay into pairs of charged Standard Model particles
that can be detected by the Alpha Magnetic Spectrometer. The directionality of
this "dark sunshine" is distinct from all astrophysical backgrounds, providing
an opportunity for unambiguous dark matter discovery by AMS. We perform a
complete analysis of this scenario including Sommerfeld enhancements of dark
matter annihilation and the effect of the Sun's magnetic field on the signal,
and we define a set of cuts to optimize the signal probability. With the three
years of data already collected, AMS may discover dark matter with mass 1 TeV
$\lesssim m_X \lesssim$ 10 TeV, dark photon masses $m_{A'} \sim \mathcal
O(100)$ MeV, and kinetic mixing parameters $10^{-10} \lesssim \varepsilon
\lesssim 10^{-8}$. The proposed search extends beyond existing beam dump and
supernova bounds, and it is complementary to direct detection, probing the same
region of parameter space for elastic dark matter, but potentially far more in
the case of inelastic dark matter.
| [
{
"created": "Wed, 3 Feb 2016 21:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2017 21:00:59 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2017 21:35:38 GMT",
"version": "v3"
}
] | 2017-10-05 | [
[
"Feng",
"Jonathan L.",
""
],
[
"Smolinsky",
"Jordan",
""
],
[
"Tanedo",
"Philip",
""
]
] | Dark matter may interact with the Standard Model through the kinetic mixing of dark photons, $A'$, with Standard Model photons. Such dark matter will accumulate in the Sun and annihilate into dark photons. The dark photons may then leave the Sun and decay into pairs of charged Standard Model particles that can be detected by the Alpha Magnetic Spectrometer. The directionality of this "dark sunshine" is distinct from all astrophysical backgrounds, providing an opportunity for unambiguous dark matter discovery by AMS. We perform a complete analysis of this scenario including Sommerfeld enhancements of dark matter annihilation and the effect of the Sun's magnetic field on the signal, and we define a set of cuts to optimize the signal probability. With the three years of data already collected, AMS may discover dark matter with mass 1 TeV $\lesssim m_X \lesssim$ 10 TeV, dark photon masses $m_{A'} \sim \mathcal O(100)$ MeV, and kinetic mixing parameters $10^{-10} \lesssim \varepsilon \lesssim 10^{-8}$. The proposed search extends beyond existing beam dump and supernova bounds, and it is complementary to direct detection, probing the same region of parameter space for elastic dark matter, but potentially far more in the case of inelastic dark matter. |
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