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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0310029
|
Pawel Jankowski
|
F.Cornet (Granada U.), P.Jankowski (Warsaw U.), M.Krawczyk (Warsaw U)
|
CJK- Improved LO Parton Distributions in the Real Photon and Their
Experimental Uncertainties
|
Prepared for Photon 2003: International Conference on the Structure
and Interactions of the Photon (Including the 15th International Workshop on
Photon-Photon Collisions), Frascati (Italy), 7-11 April 2003; 10 pages, Latex
using espcrc2 style, 1 tex and 5 postscript figures; FORTRAN programs
available at http://www.fuw.edu.pl/~pjank/param.html
|
Nucl.Phys.Proc.Suppl.126:28-37,2004
|
10.1016/S0920-5632(03)02304-1
|
ITF-2003-28, UG-FT-155/03, CAFPE-25/03
|
hep-ph
| null |
A new analysis of the radiatively generated, LO quark (u,d,s,c,b) and gluon
densities in the real, unpolarized photon, improved in respect to our paper
[1], is presented. We perform four new global fits to the experimental data for
F2^gamma, two using a standard FFNS approach and two based on ACOT(chi) scheme
[2], leading to the FFNS(CJK) and CJK models. We also present the analysis of
the uncertainties of the new CJK 2 parton distributions due to the experimental
errors, the very first such analysis performed for the photon. This analysis is
based on the Hessian method, for a comparison for chosen cross-sections we use
also the Lagrange method.
|
[
{
"created": "Thu, 2 Oct 2003 11:26:00 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Cornet",
"F.",
"",
"Granada U."
],
[
"Jankowski",
"P.",
"",
"Warsaw U."
],
[
"Krawczyk",
"M.",
"",
"Warsaw U"
]
] |
A new analysis of the radiatively generated, LO quark (u,d,s,c,b) and gluon densities in the real, unpolarized photon, improved in respect to our paper [1], is presented. We perform four new global fits to the experimental data for F2^gamma, two using a standard FFNS approach and two based on ACOT(chi) scheme [2], leading to the FFNS(CJK) and CJK models. We also present the analysis of the uncertainties of the new CJK 2 parton distributions due to the experimental errors, the very first such analysis performed for the photon. This analysis is based on the Hessian method, for a comparison for chosen cross-sections we use also the Lagrange method.
|
1705.00263
|
Fred Jegerlehner
|
Fred Jegerlehner
|
Muon g-2 Theory: the Hadronic Part
|
17 pages, 26 figures
| null |
10.1051/epjconf/201816600022
|
DESY 17-058, HU-EP-17/12
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present a status report of the hadronic vacuum polarization effects for the
muon $g-2$, to be considered as an update of [1]. The update concerns recent
new inclusive $R$ measurements from KEDR in the energy range 1.84 to 3.72 GeV.
For the leading order contributions I find $a_\mu^{\mathrm{had}(1)}=(688.07\pm
4.14)[688.77\pm3.38]\times 10^{-10}$ based on $e^+e^-$data [incl. $\tau$ data],
$a_\mu^{\mathrm{had}(2)}= (-9.93\pm 0.07) \times 10^{-10}$ (NLO) and
$a_\mu^{\mathrm{had}(3)}= (1.22\pm 0.01) \times 10^{-10}$ (NNLO). Collecting
recent progress in the hadronic light-by-light scattering I adopt
$\pi^0,\eta,\eta'$ [$95 \pm 12$] + axial--vector [$8 \pm ~3$] + scalar [$-6\pm
~1$] + $\pi,K$ loops [$-20\pm 5$] + quark loops [$22\pm ~4$] + tensor [$1\pm
~0$] + NLO [$3\pm ~2$] which yields $
a^{(6)}_\mu(\mathrm{lbl},\mathrm{had})=(103 \pm 29) \times 10^{-11}.$ With
these updates I find $a_\mu^{\rm exp}-a_\mu^{\rm the}=(31.3\pm 7.7)\times
10^{-10}$ a 4.1 $\sigma$ deviation. Recent lattice QCD results and future
prospects to improve hadronic contributions are discussed.
|
[
{
"created": "Sun, 30 Apr 2017 02:30:23 GMT",
"version": "v1"
}
] |
2018-02-14
|
[
[
"Jegerlehner",
"Fred",
""
]
] |
I present a status report of the hadronic vacuum polarization effects for the muon $g-2$, to be considered as an update of [1]. The update concerns recent new inclusive $R$ measurements from KEDR in the energy range 1.84 to 3.72 GeV. For the leading order contributions I find $a_\mu^{\mathrm{had}(1)}=(688.07\pm 4.14)[688.77\pm3.38]\times 10^{-10}$ based on $e^+e^-$data [incl. $\tau$ data], $a_\mu^{\mathrm{had}(2)}= (-9.93\pm 0.07) \times 10^{-10}$ (NLO) and $a_\mu^{\mathrm{had}(3)}= (1.22\pm 0.01) \times 10^{-10}$ (NNLO). Collecting recent progress in the hadronic light-by-light scattering I adopt $\pi^0,\eta,\eta'$ [$95 \pm 12$] + axial--vector [$8 \pm ~3$] + scalar [$-6\pm ~1$] + $\pi,K$ loops [$-20\pm 5$] + quark loops [$22\pm ~4$] + tensor [$1\pm ~0$] + NLO [$3\pm ~2$] which yields $ a^{(6)}_\mu(\mathrm{lbl},\mathrm{had})=(103 \pm 29) \times 10^{-11}.$ With these updates I find $a_\mu^{\rm exp}-a_\mu^{\rm the}=(31.3\pm 7.7)\times 10^{-10}$ a 4.1 $\sigma$ deviation. Recent lattice QCD results and future prospects to improve hadronic contributions are discussed.
|
2203.07827
|
Wolfgang Sch\"afer
|
Anna Cisek, Wolfgang Sch\"afer, Antoni Szczurek
|
Structure and production mechanism of the enigmatic $X(3872)$ in
high-energy hadronic reactions
|
17 pages, 7 figures, v2: references added, v3: a diagram added, minor
changes
| null |
10.1140/epjc/s10052-022-11029-x
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We calculate the total cross section and transverse momentum distributions
for the production of enigmatic $\chi_{c,1}(3872)$ (or X(3872)) assuming
different scenarios: $c \bar c$ state and $D^{0*} {\bar D}^0 + D^0 {\bar
D}^{0*}$ molecule. The derivative of the $c \bar c$ wave function needed in the
first scenario is taken from a potential model calculations. Compared to
earlier calculation of molecular state we include not only single parton
scattering (SPS) but also double parton scattering (DPS) contributions. The
latter one seems to give smaller contribution than the SPS one. The upper limit
for the DPS production of $\chi_{c,1}(3872)$ is much below the CMS data. We
compare results of our calculations with existing experimental data of CMS,
ATLAS and LHCb collaborations. Reasonable cross sections can be obtained in
either $c \bar c$ or molecular $D {\bar D}^*$ scenarios for $X(3872)$. Also a
hybrid scenario is not excluded.
|
[
{
"created": "Tue, 15 Mar 2022 12:30:01 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Mar 2022 08:30:50 GMT",
"version": "v2"
},
{
"created": "Fri, 20 May 2022 08:57:52 GMT",
"version": "v3"
}
] |
2022-12-14
|
[
[
"Cisek",
"Anna",
""
],
[
"Schäfer",
"Wolfgang",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We calculate the total cross section and transverse momentum distributions for the production of enigmatic $\chi_{c,1}(3872)$ (or X(3872)) assuming different scenarios: $c \bar c$ state and $D^{0*} {\bar D}^0 + D^0 {\bar D}^{0*}$ molecule. The derivative of the $c \bar c$ wave function needed in the first scenario is taken from a potential model calculations. Compared to earlier calculation of molecular state we include not only single parton scattering (SPS) but also double parton scattering (DPS) contributions. The latter one seems to give smaller contribution than the SPS one. The upper limit for the DPS production of $\chi_{c,1}(3872)$ is much below the CMS data. We compare results of our calculations with existing experimental data of CMS, ATLAS and LHCb collaborations. Reasonable cross sections can be obtained in either $c \bar c$ or molecular $D {\bar D}^*$ scenarios for $X(3872)$. Also a hybrid scenario is not excluded.
|
0707.0677
|
Roman Zwicky
|
Roman Zwicky
|
Unparticles at heavy flavour scales: CP violating phenomena
|
33 pages, 9 figures
|
Phys.Rev.D77:036004,2008
|
10.1103/PhysRevD.77.036004
|
DCPT/07/58, IPPP/07/29
|
hep-ph
| null |
Coupling the scale invariant unparticle sector to flavour physics and
assuming that it remains scale invariant we investigate its consequences in
heavy flavour physics. A drastic feature of unparticle physics is an unusual
phase leading to novel CP violating phenomena. We consider the CP asymmetry in
the leptonic decay B^+ -> tau^+ nu and the hadronic decay B_d -> D^+D^-, taking
into account constraints of branching ratios and time dependent CP asymmetries.
Generic plots are shown and it turns out that there exist parameters for which
the CP violation is maximal. A prediction of a large CP asymmetry in B_d ->
D^+D^- is difficult to achieve in other models without contradicting the
current data in other channels. The prediction of a CP asymmetry in leptonic
decays, such as B^+ -> tau^+ nu, is novel. We identify the CP compensating mode
due to the unparticles and show explicitly that it exactly cancels the CP
asymmetry of B^+ -> tau^+ nu as demanded by CPT invariance. Building up on
earlier works we investigate the breaking of scale invaricance, due to the
coupling to the Higgs and the size of the effects in the weak sector resorting
to a dimensional analysis. An enhancement is observed on the grounds of the
relevance of the unparticle interaction operator as compared to the weak
four-Fermi term.
|
[
{
"created": "Wed, 4 Jul 2007 18:25:34 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Zwicky",
"Roman",
""
]
] |
Coupling the scale invariant unparticle sector to flavour physics and assuming that it remains scale invariant we investigate its consequences in heavy flavour physics. A drastic feature of unparticle physics is an unusual phase leading to novel CP violating phenomena. We consider the CP asymmetry in the leptonic decay B^+ -> tau^+ nu and the hadronic decay B_d -> D^+D^-, taking into account constraints of branching ratios and time dependent CP asymmetries. Generic plots are shown and it turns out that there exist parameters for which the CP violation is maximal. A prediction of a large CP asymmetry in B_d -> D^+D^- is difficult to achieve in other models without contradicting the current data in other channels. The prediction of a CP asymmetry in leptonic decays, such as B^+ -> tau^+ nu, is novel. We identify the CP compensating mode due to the unparticles and show explicitly that it exactly cancels the CP asymmetry of B^+ -> tau^+ nu as demanded by CPT invariance. Building up on earlier works we investigate the breaking of scale invaricance, due to the coupling to the Higgs and the size of the effects in the weak sector resorting to a dimensional analysis. An enhancement is observed on the grounds of the relevance of the unparticle interaction operator as compared to the weak four-Fermi term.
|
0803.3450
|
Pavel Fileviez Perez
|
Pavel Fileviez Perez, Tao Han, Gui-Yu Huang, Tong Li, Kai Wang
|
Testing a Neutrino Mass Generation Mechanism at the Large Hadron
Collider
|
5 pages, 4 figures, published in PRD Rapid Communication
|
Phys.Rev.D78:071301,2008
|
10.1103/PhysRevD.78.071301
|
MADPH-08-1505, NSF-KITP-08-36
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Large Hadron Collider could be a discovery machine for the neutrino mass
pattern and its Majorana nature in the context of a well-motivated TeV scale
Type II seesaw model. This is achieved by identifying the flavor structure of
the lepton number violating decays of the charged Higgs bosons. The observation
of either H^+ --> tau^+ nubar or H^+ --> e^+ nubar will be particularly robust
to determine the neutrino spectra since they are independent of the unknown
Majorana phases, which could be probed via the H^{++} --> e^+_i e^+_j decays.
In a less favorable scenario when the leptonic channels are suppressed, one
needs to observe the decays H^+ --> W^+ H_1, and H^+ --> t bbar to confirm the
triplet-doublet mixing that implies the Type II relation. The associated
production H^{++} H^{-} is crucial in order to test the triplet nature of the
Higgs field.
|
[
{
"created": "Mon, 24 Mar 2008 22:36:23 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Oct 2008 00:11:28 GMT",
"version": "v2"
}
] |
2008-10-09
|
[
[
"Perez",
"Pavel Fileviez",
""
],
[
"Han",
"Tao",
""
],
[
"Huang",
"Gui-Yu",
""
],
[
"Li",
"Tong",
""
],
[
"Wang",
"Kai",
""
]
] |
The Large Hadron Collider could be a discovery machine for the neutrino mass pattern and its Majorana nature in the context of a well-motivated TeV scale Type II seesaw model. This is achieved by identifying the flavor structure of the lepton number violating decays of the charged Higgs bosons. The observation of either H^+ --> tau^+ nubar or H^+ --> e^+ nubar will be particularly robust to determine the neutrino spectra since they are independent of the unknown Majorana phases, which could be probed via the H^{++} --> e^+_i e^+_j decays. In a less favorable scenario when the leptonic channels are suppressed, one needs to observe the decays H^+ --> W^+ H_1, and H^+ --> t bbar to confirm the triplet-doublet mixing that implies the Type II relation. The associated production H^{++} H^{-} is crucial in order to test the triplet nature of the Higgs field.
|
hep-ph/0211014
|
Lorenzo Magnea
|
S. Forte, J.I. Latorre, L. Magnea and A. Piccione
|
A determination of alpha_s from scaling violations with truncated
moments
|
5 pages, no figures. Talk given by L. Magnea at QCD02, Montpellier,
July 2002
|
Nucl.Phys.Proc.Suppl.121:46-50,2003
|
10.1016/S0920-5632(03)01810-3
|
DFTT 36/02
|
hep-ph
| null |
We describe a determination of the strong coupling alpha_s(M_Z) from scaling
violations of the nonsinglet DIS structure function, which is based on two
novel techniques aimed at controlling and minimizing the theoretical error: a
neural network parametrization of BCDMS and NMC data, and QCD evolution by
means of truncated Mellin moments.
|
[
{
"created": "Fri, 1 Nov 2002 18:02:53 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Forte",
"S.",
""
],
[
"Latorre",
"J. I.",
""
],
[
"Magnea",
"L.",
""
],
[
"Piccione",
"A.",
""
]
] |
We describe a determination of the strong coupling alpha_s(M_Z) from scaling violations of the nonsinglet DIS structure function, which is based on two novel techniques aimed at controlling and minimizing the theoretical error: a neural network parametrization of BCDMS and NMC data, and QCD evolution by means of truncated Mellin moments.
|
1803.02521
|
Bao-Dong Sun
|
Bao-Dong Sun and Yu-Bing Dong
|
$\rho$ meson impact parameter distributions
| null |
Chinese Physics C (2018)
|
10.1088/1674-1137/42/6/063104
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, the $\rho$ meson impact parameter dependent parton
distributions and the impact parameter dependent form factors are introduced
and discussed. By employing a Gaussian form wave packet, we calculate the
impact parameter distributions of $\rho$ meson based on a light-front
constituent quark model.
|
[
{
"created": "Wed, 7 Mar 2018 04:28:21 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2018 10:05:30 GMT",
"version": "v2"
}
] |
2018-05-16
|
[
[
"Sun",
"Bao-Dong",
""
],
[
"Dong",
"Yu-Bing",
""
]
] |
In this paper, the $\rho$ meson impact parameter dependent parton distributions and the impact parameter dependent form factors are introduced and discussed. By employing a Gaussian form wave packet, we calculate the impact parameter distributions of $\rho$ meson based on a light-front constituent quark model.
|
hep-ph/9911469
|
Sergey Goloskokov
|
S.V.Goloskokov
|
Diffractive hadron production and pomeron coupling structure
|
6 pages, latex, 4 figures, to be published in Proc. of the
International Bogolyubov Conference "Problems of Theoretical and Mathematical
Physics", September 27- October 6, Moscow-Dubna-Kyiv
| null | null | null |
hep-ph
| null |
Large-distance effects, which lead to the spin-flip part of the hadron
-pomeron coupling in QCD -models, are discussed. We study spin asymmetries in
exclusive reactions and in diffractive $Q \bar Q$ and vector meson production
which are sensitive to the spin-dependent part of the pomeron coupling.
|
[
{
"created": "Wed, 24 Nov 1999 14:23:22 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Goloskokov",
"S. V.",
""
]
] |
Large-distance effects, which lead to the spin-flip part of the hadron -pomeron coupling in QCD -models, are discussed. We study spin asymmetries in exclusive reactions and in diffractive $Q \bar Q$ and vector meson production which are sensitive to the spin-dependent part of the pomeron coupling.
|
1601.07391
|
Andrea Lami
|
A. Lami, J. Portoles (IFIC, Valencia) and P. Roig (Cinvestav, Mexico)
|
Lepton Flavour Violation in Hadron Decays of the Tau Lepton in the
Simplest Little Higgs Model
|
13 pages, 13 Figures
|
Phys. Rev. D 93, 076008 (2016)
|
10.1103/PhysRevD.93.076008
|
IFIC/16-04
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study Lepton Flavour Violating hadron decays of the tau lepton within the
Simplest Little Higgs model. Namely we consider $\tau \rightarrow \mu (P, V,
PP)$ where $P$ and $V$ are short for a pseudoscalar and a vector meson. We find
that, in the most positive scenarios, branching ratios for these processes are
predicted to be, at least, four orders of magnitude smaller than present
experimental bounds.
|
[
{
"created": "Wed, 27 Jan 2016 14:44:00 GMT",
"version": "v1"
}
] |
2016-04-25
|
[
[
"Lami",
"A.",
"",
"IFIC, Valencia"
],
[
"Portoles",
"J.",
"",
"IFIC, Valencia"
],
[
"Roig",
"P.",
"",
"Cinvestav, Mexico"
]
] |
We study Lepton Flavour Violating hadron decays of the tau lepton within the Simplest Little Higgs model. Namely we consider $\tau \rightarrow \mu (P, V, PP)$ where $P$ and $V$ are short for a pseudoscalar and a vector meson. We find that, in the most positive scenarios, branching ratios for these processes are predicted to be, at least, four orders of magnitude smaller than present experimental bounds.
|
1807.09615
|
Kolja Kauder
|
Kolja Kauder (for the JETSCAPE Collaboration)
|
JETSCAPE v1.0 Quickstart Guide
|
Proceedings of Quark Matter 2018, submitted to Nuclear Physics A. 4
pages, 2 figures
| null |
10.1016/j.nuclphysa.2018.09.033
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The JETSCAPE collaboration announced the first public release of its
framework and Monte Carlo event generator at this conference, providing a
unified interface and a comprehensive suite of model implementations for all
stages of ultra-relativistic heavy ion collisions. This release focuses on
validation of the framework and the $pp$ reference. A full manual is under
development. In the mean-time, these proceedings will provide a guide for
installation and simulation runs in lieu of the more traditional summary of the
presentation.
|
[
{
"created": "Tue, 24 Jul 2018 14:33:29 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2018 16:56:58 GMT",
"version": "v2"
}
] |
2019-02-20
|
[
[
"Kauder",
"Kolja",
"",
"for the JETSCAPE Collaboration"
]
] |
The JETSCAPE collaboration announced the first public release of its framework and Monte Carlo event generator at this conference, providing a unified interface and a comprehensive suite of model implementations for all stages of ultra-relativistic heavy ion collisions. This release focuses on validation of the framework and the $pp$ reference. A full manual is under development. In the mean-time, these proceedings will provide a guide for installation and simulation runs in lieu of the more traditional summary of the presentation.
|
hep-ph/9610345
|
Salman Habib
|
Fred Cooper, Salman Habib, Yuval Kluger, and Emil Mottola
|
Nonequilibrium Dynamics of Symmetry Breaking in Lambda Phi^4 Field
Theory
|
32 pages (21 figures), RevTeX (plus macro), uses epsf
|
Phys.Rev. D55 (1997) 6471-6503
|
10.1103/PhysRevD.55.6471
|
LA-UR-96-3336
|
hep-ph
| null |
The time evolution of O(N) symmetric lambda Phi^4 scalar field theory is
studied in the large N limit. In this limit the <Phi> mean field and two-point
correlation function <Phi Phi> evolve together as a self-consistent closed
Hamiltonian system, characterized by a Gaussian density matrix. The static part
of the effective Hamiltonian defines the True Effective Potential U_eff for
configurations far from thermal equilibrium. Numerically solving the time
evolution equations for energy densities corresponding to a quench in the
unstable spinodal region, we find results quite different from what might be
inferred from the equilibrium free energy ``effective'' potential F. Typical
time evolutions show effectively irreversible energy flow from the coherent
mean fields to the quantum fluctuating modes, due to the creation of massless
Goldstone bosons near threshold. The plasma frequency and collisionless damping
rate of the mean fields are calculated in terms of the particle number density
by a linear response analysis and compared with the numerical results.
Dephasing of the fluctuations leads also to the growth of an effective entropy
and the transition from quantum to classical behavior of the ensemble. In
addition to casting some light on fundamental issues of nonequilibrium quantum
statistical mechanics, the general framework presented in this work may be
applied to a study of the dynamics of second order phase transitions in a wide
variety of Landau-Ginsburg systems described by a scalar order parameter.
|
[
{
"created": "Mon, 14 Oct 1996 09:06:24 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Cooper",
"Fred",
""
],
[
"Habib",
"Salman",
""
],
[
"Kluger",
"Yuval",
""
],
[
"Mottola",
"Emil",
""
]
] |
The time evolution of O(N) symmetric lambda Phi^4 scalar field theory is studied in the large N limit. In this limit the <Phi> mean field and two-point correlation function <Phi Phi> evolve together as a self-consistent closed Hamiltonian system, characterized by a Gaussian density matrix. The static part of the effective Hamiltonian defines the True Effective Potential U_eff for configurations far from thermal equilibrium. Numerically solving the time evolution equations for energy densities corresponding to a quench in the unstable spinodal region, we find results quite different from what might be inferred from the equilibrium free energy ``effective'' potential F. Typical time evolutions show effectively irreversible energy flow from the coherent mean fields to the quantum fluctuating modes, due to the creation of massless Goldstone bosons near threshold. The plasma frequency and collisionless damping rate of the mean fields are calculated in terms of the particle number density by a linear response analysis and compared with the numerical results. Dephasing of the fluctuations leads also to the growth of an effective entropy and the transition from quantum to classical behavior of the ensemble. In addition to casting some light on fundamental issues of nonequilibrium quantum statistical mechanics, the general framework presented in this work may be applied to a study of the dynamics of second order phase transitions in a wide variety of Landau-Ginsburg systems described by a scalar order parameter.
|
hep-ph/0106011
|
Igor Sokalski
|
I.A.Sokalski, E.V.Bugaev, S.I.Klimushin (Institute for Nuclear
Research, Russian Academy of Science, Moscow)
|
MUM: flexible precise algorithm for the muon propagation
|
Contribution to the 27th ICRC (Hamburg, August 7-15, 2001), 4 pages,
5 .eps figures, uses icrc.cls
| null | null | null |
hep-ph
| null |
We present a new muon propagation Monte Carlo FORTRAN code MUM (MUons+Medium)
which possesses some advantages over analogous codes presently in use. The most
important features of the algorithm are described. Data on the test for
algorithm accuracy are presented. Contributions of different sources to the
resulting error of simulation are considered. Selected results obtained with
MUM are given and compared with ones from other codes.
|
[
{
"created": "Fri, 1 Jun 2001 13:11:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sokalski",
"I. A.",
"",
"Institute for Nuclear\n Research, Russian Academy of Science, Moscow"
],
[
"Bugaev",
"E. V.",
"",
"Institute for Nuclear\n Research, Russian Academy of Science, Moscow"
],
[
"Klimushin",
"S. I.",
"",
"Institute for Nuclear\n Research, Russian Academy of Science, Moscow"
]
] |
We present a new muon propagation Monte Carlo FORTRAN code MUM (MUons+Medium) which possesses some advantages over analogous codes presently in use. The most important features of the algorithm are described. Data on the test for algorithm accuracy are presented. Contributions of different sources to the resulting error of simulation are considered. Selected results obtained with MUM are given and compared with ones from other codes.
|
hep-ph/0210057
|
Carsten Van de Bruck
|
Ph. Brax, C. van de Bruck, A.-C. Davis and C.S. Rhodes
|
Varying Constants in Brane World Scenarios
|
5 pages, LaTeX, 5 figures; based on a talk given by C. van de Bruck
at JENAM 2002, Porto; typos corrected
|
Astrophys.Space Sci. 283 (2003) 627-632
|
10.1023/A:1022543206870
|
DAMTP-2002-118; T02/118
|
hep-ph gr-qc hep-th
| null |
Higher-dimensional theories imply that some constants, such as the
gravitational constant and the strength of the gauge-couplings, are not
fundamental constants. Instead they are related to the sizes of the
extra--dimensional space, which are moduli fields in the four--dimensional
effective theory. We study the cosmological evolution of the moduli fields
appearing in brane world scenarios and discuss the implications for varying
constants.
|
[
{
"created": "Thu, 3 Oct 2002 13:24:19 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Oct 2002 14:05:26 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Brax",
"Ph.",
""
],
[
"van de Bruck",
"C.",
""
],
[
"Davis",
"A. -C.",
""
],
[
"Rhodes",
"C. S.",
""
]
] |
Higher-dimensional theories imply that some constants, such as the gravitational constant and the strength of the gauge-couplings, are not fundamental constants. Instead they are related to the sizes of the extra--dimensional space, which are moduli fields in the four--dimensional effective theory. We study the cosmological evolution of the moduli fields appearing in brane world scenarios and discuss the implications for varying constants.
|
0911.3865
|
Wolfgang Bietenholz
|
Wolfgang Bietenholz
|
On the Isomorphic Description of Chiral Symmetry Breaking by Non-Unitary
Lie Groups
|
18 pages, to appear in Int. J. Mod. Phys. A
|
Int.J.Mod.Phys.A25:1699-1712,2010
|
10.1142/S0217751X10048123
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is well-known that chiral symmetry breaking ($\chi$SB) in QCD with
$N_{f}=2$ light quark flavours can be described by orthogonal groups as $O(4)
\to O(3)$, due to local isomorphisms. Here we discuss the question how specific
this property is. We consider generalised forms of $\chi$SB involving an
arbitrary number of light flavours of continuum or lattice fermions, in various
representations. We search systematically for isomorphic descriptions by
non-unitary, compact Lie groups. It turns out that there are a few alternative
options in terms of orthogonal groups, while we did not find any description
entirely based on symplectic or exceptional Lie groups. If we adapt such an
alternative as the symmetry breaking pattern for a generalised Higgs mechanism,
we may consider a Higgs particle composed of bound fermions and trace back the
mass generation to $\chi$SB. In fact, some of the patterns that we encounter
appear in technicolour models. In particular if one observes a Higgs mechanism
that can be expressed in terms of orthogonal groups, we specify in which cases
it could also represent some kind of $\chi$SB of techniquarks.
|
[
{
"created": "Thu, 19 Nov 2009 18:41:24 GMT",
"version": "v1"
}
] |
2010-04-22
|
[
[
"Bietenholz",
"Wolfgang",
""
]
] |
It is well-known that chiral symmetry breaking ($\chi$SB) in QCD with $N_{f}=2$ light quark flavours can be described by orthogonal groups as $O(4) \to O(3)$, due to local isomorphisms. Here we discuss the question how specific this property is. We consider generalised forms of $\chi$SB involving an arbitrary number of light flavours of continuum or lattice fermions, in various representations. We search systematically for isomorphic descriptions by non-unitary, compact Lie groups. It turns out that there are a few alternative options in terms of orthogonal groups, while we did not find any description entirely based on symplectic or exceptional Lie groups. If we adapt such an alternative as the symmetry breaking pattern for a generalised Higgs mechanism, we may consider a Higgs particle composed of bound fermions and trace back the mass generation to $\chi$SB. In fact, some of the patterns that we encounter appear in technicolour models. In particular if one observes a Higgs mechanism that can be expressed in terms of orthogonal groups, we specify in which cases it could also represent some kind of $\chi$SB of techniquarks.
|
2008.09116
|
Alexis Plascencia
|
Pavel Fileviez Perez, Alexis D. Plascencia
|
Electric Dipole Moments, New Forces and Dark Matter
|
9 pages, 10 figures. v2: Minor changes to the text, accepted for
publication in JHEP
|
JHEP 03 (2021) 185
|
10.1007/JHEP03(2021)185
| null |
hep-ph hep-ex hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
New sources of CP violation beyond the Standard Model are crucial to explain
the baryon asymmetry in the Universe. We discuss the impact of new CP violating
interactions in theories where a dark matter candidate is predicted by the
cancellation of gauge anomalies. In these theories, the constraint on the dark
matter relic density implies an upper bound on the new symmetry breaking scale
from which all new states acquire their masses. We investigate in detail the
predictions for electric dipole moments and show that if the relevant
CP-violating phase is large, experiments such as the ACME collaboration will be
able to fully probe the theory.
|
[
{
"created": "Thu, 20 Aug 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2021 21:27:19 GMT",
"version": "v2"
}
] |
2021-03-24
|
[
[
"Perez",
"Pavel Fileviez",
""
],
[
"Plascencia",
"Alexis D.",
""
]
] |
New sources of CP violation beyond the Standard Model are crucial to explain the baryon asymmetry in the Universe. We discuss the impact of new CP violating interactions in theories where a dark matter candidate is predicted by the cancellation of gauge anomalies. In these theories, the constraint on the dark matter relic density implies an upper bound on the new symmetry breaking scale from which all new states acquire their masses. We investigate in detail the predictions for electric dipole moments and show that if the relevant CP-violating phase is large, experiments such as the ACME collaboration will be able to fully probe the theory.
|
hep-ph/9810534
|
Luc Marleau
|
B. Dion, T. Gregoire, D. London, L. Marleau and H. Nadeau
|
Bilepton Production at Hadron Colliders
|
20 pages (LATEX), 7 figures, minor modifications
|
Phys.Rev. D59 (1999) 075006
|
10.1103/PhysRevD.59.075006
|
LAVAL-PHY-98-12, UdeM-GPP-TH-98-53, McGill-98/26
|
hep-ph
| null |
We examine, as model-independently as possible, the production of bileptons
at hadron colliders. When a particular model is necessary or useful, we choose
the 3-3-1 model. We consider a variety of processes: q anti-q -> Y^{++} Y^{--},
u anti-d -> Y^{++} Y^{-}, anti-u d -> Y^+ Y^{--}, q anti-q -> Y^{++} e^{-}
e^{-}, q anti-q -> phi^{++} phi^{--}, u anti-d -> -> phi^{++} phi^{-}, and
anti-u d -> phi^{+} phi^{--}, where Y and phi are vector and scalar bileptons,
respectively. Given the present low-energy constraints, we find that at the
Tevatron, vector bileptons are unobservable, while light scalar bileptons
(M_phi <= 300 GeV) are just barely observable. At the LHC, the reach is
extended considerably: vector bileptons of mass M_Y <= 1 TeV are observable, as
are scalar bileptons of mass M_phi <= 850 GeV.
|
[
{
"created": "Thu, 29 Oct 1998 18:34:03 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Nov 1998 14:24:33 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Dion",
"B.",
""
],
[
"Gregoire",
"T.",
""
],
[
"London",
"D.",
""
],
[
"Marleau",
"L.",
""
],
[
"Nadeau",
"H.",
""
]
] |
We examine, as model-independently as possible, the production of bileptons at hadron colliders. When a particular model is necessary or useful, we choose the 3-3-1 model. We consider a variety of processes: q anti-q -> Y^{++} Y^{--}, u anti-d -> Y^{++} Y^{-}, anti-u d -> Y^+ Y^{--}, q anti-q -> Y^{++} e^{-} e^{-}, q anti-q -> phi^{++} phi^{--}, u anti-d -> -> phi^{++} phi^{-}, and anti-u d -> phi^{+} phi^{--}, where Y and phi are vector and scalar bileptons, respectively. Given the present low-energy constraints, we find that at the Tevatron, vector bileptons are unobservable, while light scalar bileptons (M_phi <= 300 GeV) are just barely observable. At the LHC, the reach is extended considerably: vector bileptons of mass M_Y <= 1 TeV are observable, as are scalar bileptons of mass M_phi <= 850 GeV.
|
hep-ph/0011071
|
Shro Oleg Ivanovich
|
A. F. Krutov, O. I. Shro and V. E. Troitsky
|
Isgur--Wise function in a relativistic model of constituent quarks
|
10 pages, latex, 1 figure as eps-file
|
Phys.Lett.B502:140-146,2001
|
10.1016/S0370-2693(00)01377-0
| null |
hep-ph
| null |
The integral representation for Isgur -- Wise function (IWF) is obtained in
the framework of instant--form relativistic Hamiltonian dynamics for mesons
with one heavy quark. The upper and lower limits are calculated for the slope
parameter of IWF $\rho^2$ by the model independent way. IWF is calculated for
different wave functions of quarks in the meson. The difference between the
limits of $\rho^2$ equals 1/3. The constraint on the slope parameter is in a
good agreement with experiments. The weak dependence of IWF on the choice of
wave functions is found.
|
[
{
"created": "Mon, 6 Nov 2000 10:26:16 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2000 07:56:23 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Krutov",
"A. F.",
""
],
[
"Shro",
"O. I.",
""
],
[
"Troitsky",
"V. E.",
""
]
] |
The integral representation for Isgur -- Wise function (IWF) is obtained in the framework of instant--form relativistic Hamiltonian dynamics for mesons with one heavy quark. The upper and lower limits are calculated for the slope parameter of IWF $\rho^2$ by the model independent way. IWF is calculated for different wave functions of quarks in the meson. The difference between the limits of $\rho^2$ equals 1/3. The constraint on the slope parameter is in a good agreement with experiments. The weak dependence of IWF on the choice of wave functions is found.
|
hep-ph/0607011
|
Pierpaolo Mastrolia
|
Pierpaolo Mastrolia
|
Unitarity Cuts: NLO Six-Gluon Amplitudes in QCD
|
talk given at Loops & Legs 2006, April 23-28, Eisenach (Germany)
| null |
10.1016/j.nuclphysbps.2006.09.046
| null |
hep-ph
| null |
We report on a technique for evaluating finite unitarity cut for one-loop
amplitudes in gauge theories, and discuss its application to the
cut-constructible part of six-gluon amplitude in QCD.
|
[
{
"created": "Sun, 2 Jul 2006 10:56:10 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Mastrolia",
"Pierpaolo",
""
]
] |
We report on a technique for evaluating finite unitarity cut for one-loop amplitudes in gauge theories, and discuss its application to the cut-constructible part of six-gluon amplitude in QCD.
|
0908.3319
|
Miguel Sanchis
|
Miguel-Angel Sanchis-Lozano
|
Signatures of (Un)particles from a Hidden Sector in multiparticle
dynamics at Tevatron/LHC
|
4 pages, 2 figs, Talk given at SUSY09, Northeastern University,
Boston June 2009
|
AIP Conf.Proc.1200:774-777,2010
|
10.1063/1.3327727
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The study of multiparticle dynamics in hadron-hadron collisions at Tevatron
and LHC could provide useful information on new physics in addition to the
expected signatures on the transverse plane. We suggest that an analysis of
inclusive correlations between emitted particles in $pp$ inelastic collisions,
and factorial moments of multiplicity distributions, may be helpful in
uncovering (un)particles from Hidden Sectors, using underlying events tagged by
hard products like high $p_T$ leptons and photons, and applying stringent
selection criteria like event shape variables, etc
|
[
{
"created": "Sun, 23 Aug 2009 17:43:37 GMT",
"version": "v1"
}
] |
2015-05-14
|
[
[
"Sanchis-Lozano",
"Miguel-Angel",
""
]
] |
The study of multiparticle dynamics in hadron-hadron collisions at Tevatron and LHC could provide useful information on new physics in addition to the expected signatures on the transverse plane. We suggest that an analysis of inclusive correlations between emitted particles in $pp$ inelastic collisions, and factorial moments of multiplicity distributions, may be helpful in uncovering (un)particles from Hidden Sectors, using underlying events tagged by hard products like high $p_T$ leptons and photons, and applying stringent selection criteria like event shape variables, etc
|
1912.13313
|
Konstantin Stankevich
|
Konstantin Stankevich, Alexander Studenikin
|
The effect of neutrino quantum decoherence
|
Proceedings of European Physical Society Conference on High Energy
Physics - EPS-HEP2019, 10-17 July, 2019. Submitted to Proceedings of Science.
arXiv admin note: text overlap with arXiv:1912.13311
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The neutrino oscillation patterns can be modified by neutrino interactions
with external environments including electromagnetic fields that can influence
on neutrinos in the case neutrinos have nonzero electromagnetic properties [1].
The phenomenon of neutrino oscillations can proceed only in the case of the
coherent superposition of neutrino mass states. An external environment can
modify a neutrino evolution in a way that conditions for the coherent
superposition of neutrino mass states are violated. Such a violation is called
quantum decoherence of neutrino states and leads to the suppression of flavor
neutrino oscillations [2, 3]. Note that neutrino decoherence appeared due to
the wave separation of different mass states is usually not related to quantum
neutrino decoherence, the effect that is not considered below. We consider the
neutrino quantum decoherence due to neutrino radiative decay in the presence of
an electron medium and radiation field. The corresponding damping of neutrino
oscillations is calculated.
|
[
{
"created": "Tue, 31 Dec 2019 14:24:02 GMT",
"version": "v1"
}
] |
2020-01-01
|
[
[
"Stankevich",
"Konstantin",
""
],
[
"Studenikin",
"Alexander",
""
]
] |
The neutrino oscillation patterns can be modified by neutrino interactions with external environments including electromagnetic fields that can influence on neutrinos in the case neutrinos have nonzero electromagnetic properties [1]. The phenomenon of neutrino oscillations can proceed only in the case of the coherent superposition of neutrino mass states. An external environment can modify a neutrino evolution in a way that conditions for the coherent superposition of neutrino mass states are violated. Such a violation is called quantum decoherence of neutrino states and leads to the suppression of flavor neutrino oscillations [2, 3]. Note that neutrino decoherence appeared due to the wave separation of different mass states is usually not related to quantum neutrino decoherence, the effect that is not considered below. We consider the neutrino quantum decoherence due to neutrino radiative decay in the presence of an electron medium and radiation field. The corresponding damping of neutrino oscillations is calculated.
|
hep-ph/0001097
|
Krutenkova Anna
|
A.B.Kaidalov and A.P.Krutenkova (ITEP, Moscow)
|
On Importance of Inelastic Rescatterings in Pion Double Charge Exchange
on Nuclei
|
25 pages, 13 figures, LaTeX style files cernart.sty and crna12.sty
| null | null | null |
hep-ph
| null |
Different aspects of the Gribov--Glauber approach for calculation of
inclusive pion double charge exchange (DCX) on nuclei are investigated.
Recently we have shown that inelastic rescatterings (IR) with two (and more)
pions in the intermediate states give an important contribution to the process
of DCX at energies above $\sim0.6 GeV$. In this paper we use the one pion
exchange model to study in details amplitudes of two pion production. This
allows us to verify theoretical assumptions made in the previous paper and to
predict cross section for the forward inclusive pion DCX at energies $\ga1
GeV$, where IR dominate over the conventional DCX mechanism of two sequential
single charge exchanges.
|
[
{
"created": "Wed, 12 Jan 2000 16:40:10 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kaidalov",
"A. B.",
"",
"ITEP, Moscow"
],
[
"Krutenkova",
"A. P.",
"",
"ITEP, Moscow"
]
] |
Different aspects of the Gribov--Glauber approach for calculation of inclusive pion double charge exchange (DCX) on nuclei are investigated. Recently we have shown that inelastic rescatterings (IR) with two (and more) pions in the intermediate states give an important contribution to the process of DCX at energies above $\sim0.6 GeV$. In this paper we use the one pion exchange model to study in details amplitudes of two pion production. This allows us to verify theoretical assumptions made in the previous paper and to predict cross section for the forward inclusive pion DCX at energies $\ga1 GeV$, where IR dominate over the conventional DCX mechanism of two sequential single charge exchanges.
|
0907.2527
|
Ulrich Langenfeld
|
U. Langenfeld, S. Moch, and P. Uwer
|
New results for t bar t production at hadron colliders
|
5 pages, 9 figures, to appear in the proceedings of the XVII
International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS
2009, 26-30 April 2009, Madrid
| null | null |
DESY-09-104, SFB/CPP-09-61, HU-EP-09/31
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present new theoretical predictions for the t bar t production cross
section at NNLO at the Tevatron and the LHC. We discuss the scale uncertainty
and the errors due to the parton distribution functions (PDFs). For the LHC, we
present a fit formula for the pair production cross section as a function of
the center of mass energy and we provide predictions for the pair production
cross section of a hypothetical heavy fourth generation quark t'.
|
[
{
"created": "Wed, 15 Jul 2009 08:40:48 GMT",
"version": "v1"
}
] |
2009-07-16
|
[
[
"Langenfeld",
"U.",
""
],
[
"Moch",
"S.",
""
],
[
"Uwer",
"P.",
""
]
] |
We present new theoretical predictions for the t bar t production cross section at NNLO at the Tevatron and the LHC. We discuss the scale uncertainty and the errors due to the parton distribution functions (PDFs). For the LHC, we present a fit formula for the pair production cross section as a function of the center of mass energy and we provide predictions for the pair production cross section of a hypothetical heavy fourth generation quark t'.
|
hep-ph/9310321
| null |
V.Barone, M.Genovese, N.N.Nikolaev, E.Predazzi and B.G.Zakharov
|
Shadowing in deuterium and the small--$x$ limit of $F_2^n/F_2^p$ and
$F_2^p - F_2^n$
|
6 pages, latex, DFTT-93-61
|
Phys.Lett. B321 (1994) 137-139
|
10.1016/0370-2693(94)90339-5
| null |
hep-ph
| null |
We discuss the updated NMC determination of $F_2^n/F_2^p$ and $F_2^p -
F_2^n$. Shadowing effects in deuterium make the structure functions determined
by the NMC sensibly different from the true ones in the low--$x$ region. We
show that the departure of $F_2^n/F_2^p$ and $F_2^p-F_2^n$ from the Regge
expectations at small $x$ observed by the NMC likely disappears if one takes
into account the shadowing corrections.
|
[
{
"created": "Wed, 20 Oct 1993 16:50:20 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Barone",
"V.",
""
],
[
"Genovese",
"M.",
""
],
[
"Nikolaev",
"N. N.",
""
],
[
"Predazzi",
"E.",
""
],
[
"Zakharov",
"B. G.",
""
]
] |
We discuss the updated NMC determination of $F_2^n/F_2^p$ and $F_2^p - F_2^n$. Shadowing effects in deuterium make the structure functions determined by the NMC sensibly different from the true ones in the low--$x$ region. We show that the departure of $F_2^n/F_2^p$ and $F_2^p-F_2^n$ from the Regge expectations at small $x$ observed by the NMC likely disappears if one takes into account the shadowing corrections.
|
hep-ph/9809540
|
Mercedes Fatas
|
Angel Morales (University of Zaragoza)
|
Review on Double Beta Decay Experiments and Comparison with Theory
|
12 pages, 9 figures. To be published in Neutrino 98 Conference
Proceedings, Nucl. Phys. B (Proc. Suppl.). Ed. by Y. Suzuki and Y. Totsuka
|
Nucl.Phys.Proc.Suppl. 77 (1999) 335-345
|
10.1016/S0920-5632(99)00440-5
| null |
hep-ph
| null |
The current situation of the double beta decay direct counting experiments is
briefly reviewed. A comparison with the theoretical predictions in some
representative nuclear models is presented.
|
[
{
"created": "Fri, 25 Sep 1998 17:28:57 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Morales",
"Angel",
"",
"University of Zaragoza"
]
] |
The current situation of the double beta decay direct counting experiments is briefly reviewed. A comparison with the theoretical predictions in some representative nuclear models is presented.
|
hep-ph/0204197
|
Stanley J. Brodsky
|
Stanley J. Brodsky (SLAC)
|
Physics Opportunities at a Photon-Photon Collider
|
Invited Talk presented at the 4th International Workshop On
Electron-Electron Interactions at TeV Energies (E- E- 01), University of
California, Santa Cruz, CA, 7-9 December 2001
|
Int.J.Mod.Phys.A18:2871-2892,2003
|
10.1142/S0217751X03016343
|
SLAC-PUB-9197
|
hep-ph
| null |
The advent of back-scattered laser beams for electron-positron colliders will
allow detailed studies of a large array of high energy photon-photon and
photon-electron collision processes with polarized beams. These include tests
of electroweak theory in photon-photon annihilation such as $\gamma \gamma \to
W^+ W^-$, $\gamma \gamma \to $ Higgs bosons, and higher-order loop processes,
such as $\gamma \gamma \to \gamma \gamma, Z \gamma, H^0 Z^0$ and $Z Z.$ Methods
for measuring the anomalous magnetic and quadrupole moments of the $W$ and $Z$
gauge bosons to high precision in polarized electron-photon and photon-photon
collisions are discussed. Since each photon can be resolved into a $W^+ W^-$
pair, high energy photon-photon collisions can also provide a remarkably
background-free laboratory for studying $W W$ collisions and annihilation. I
also review high energy $\gamma \gamma$ and $e \gamma$ tests of quantum
chromodynamics, including the production of two gluon jets in photon-photon
collisions, deeply virtual Compton scattering on a photon target, and
leading-twist single-spin asymmetries for a photon polarized normal to a
production plane. Exclusive hadron production processes in photon-photon
collisions provide important tests of QCD at the amplitude level, particularly
as measures of hadron distribution amplitudes which are also important for the
analysis of exclusive semi-leptonic and two-body hadronic B-decays.
|
[
{
"created": "Tue, 16 Apr 2002 22:21:36 GMT",
"version": "v1"
}
] |
2009-09-11
|
[
[
"Brodsky",
"Stanley J.",
"",
"SLAC"
]
] |
The advent of back-scattered laser beams for electron-positron colliders will allow detailed studies of a large array of high energy photon-photon and photon-electron collision processes with polarized beams. These include tests of electroweak theory in photon-photon annihilation such as $\gamma \gamma \to W^+ W^-$, $\gamma \gamma \to $ Higgs bosons, and higher-order loop processes, such as $\gamma \gamma \to \gamma \gamma, Z \gamma, H^0 Z^0$ and $Z Z.$ Methods for measuring the anomalous magnetic and quadrupole moments of the $W$ and $Z$ gauge bosons to high precision in polarized electron-photon and photon-photon collisions are discussed. Since each photon can be resolved into a $W^+ W^-$ pair, high energy photon-photon collisions can also provide a remarkably background-free laboratory for studying $W W$ collisions and annihilation. I also review high energy $\gamma \gamma$ and $e \gamma$ tests of quantum chromodynamics, including the production of two gluon jets in photon-photon collisions, deeply virtual Compton scattering on a photon target, and leading-twist single-spin asymmetries for a photon polarized normal to a production plane. Exclusive hadron production processes in photon-photon collisions provide important tests of QCD at the amplitude level, particularly as measures of hadron distribution amplitudes which are also important for the analysis of exclusive semi-leptonic and two-body hadronic B-decays.
|
1805.06832
|
Abhishek Iyer M
|
Abhishek M. Iyer
|
$B$ anomalies: From warped models to colliders
|
4 Pages, 2 Figures. Contributions to the proceedings for Rencontres
de Moriond, QCD and High energy interactions 2018
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We address the anomalies in the semi leptonic decays of $B$ mesons in a
warped custodial framework. Two possible solutions of lepton non-universality
are discussed: A) The muon singlets couple non-universally to NP and B) The
non-universality is in the coupling of lepton doublets. Both these scenarios
are characterized by different predictions for rare Kaon decays. An essential
feature of these scenarios is that the electron contribution to the Wilson
coefficients (WC) is non-vanishing, thereby offering possibilities for
different patterns of solutions. Beginning with a generic $Z'$ model, we
demonstrate how the observation of the ratio $N_{\mu\mu}/N_{ee}$ can be mapped
to a given pattern of WC which satisfy the anomalies.
|
[
{
"created": "Thu, 17 May 2018 15:51:13 GMT",
"version": "v1"
}
] |
2018-05-18
|
[
[
"Iyer",
"Abhishek M.",
""
]
] |
We address the anomalies in the semi leptonic decays of $B$ mesons in a warped custodial framework. Two possible solutions of lepton non-universality are discussed: A) The muon singlets couple non-universally to NP and B) The non-universality is in the coupling of lepton doublets. Both these scenarios are characterized by different predictions for rare Kaon decays. An essential feature of these scenarios is that the electron contribution to the Wilson coefficients (WC) is non-vanishing, thereby offering possibilities for different patterns of solutions. Beginning with a generic $Z'$ model, we demonstrate how the observation of the ratio $N_{\mu\mu}/N_{ee}$ can be mapped to a given pattern of WC which satisfy the anomalies.
|
hep-ph/0203016
|
Adnan Bashir
|
A. Bashir, A. Huet and A. Raya (U. of Michoacan)
|
Gauge Dependence of Mass and Condensate in Chirally Asymmetric Phase of
Quenched QED3
|
14 pages, 11 figures, uses revtex
|
Phys.Rev.D66:025029,2002
|
10.1103/PhysRevD.66.025029
| null |
hep-ph
| null |
We study three dimensional quenched Quantum Electrodynamics in the bare
vertex approximation. We investigate the gauge dependence of the dynamically
generated Euclidean mass of the fermion and the chiral condensate for a wide
range of values of the covariant gauge parameter $\xi$. We find that (i) away
from $\xi=0$, gauge dependence of the said quantities is considerably reduced
without resorting to sophisticated vertex {\em ansatze}, (ii) wavefunction
renormalization plays an important role in restoring gauge invariance and (iii)
the Ward-Green-Takahashi identity seems to increase the gauge dependence when
used in conjunction with some simplifying assumptions. In the Landau gauge, we
also verify that our results are in agreement with those based upon dimensional
regularization scheme within the numerical accuracy available.
|
[
{
"created": "Sat, 2 Mar 2002 00:28:22 GMT",
"version": "v1"
}
] |
2009-08-11
|
[
[
"Bashir",
"A.",
"",
"U. of Michoacan"
],
[
"Huet",
"A.",
"",
"U. of Michoacan"
],
[
"Raya",
"A.",
"",
"U. of Michoacan"
]
] |
We study three dimensional quenched Quantum Electrodynamics in the bare vertex approximation. We investigate the gauge dependence of the dynamically generated Euclidean mass of the fermion and the chiral condensate for a wide range of values of the covariant gauge parameter $\xi$. We find that (i) away from $\xi=0$, gauge dependence of the said quantities is considerably reduced without resorting to sophisticated vertex {\em ansatze}, (ii) wavefunction renormalization plays an important role in restoring gauge invariance and (iii) the Ward-Green-Takahashi identity seems to increase the gauge dependence when used in conjunction with some simplifying assumptions. In the Landau gauge, we also verify that our results are in agreement with those based upon dimensional regularization scheme within the numerical accuracy available.
|
hep-ph/9709352
|
Kirill Melnikov
|
Dmitri Ivanov and Kirill Melnikov
|
Lepton pair production by a high energy photon in a strong
electromagnetic field
|
20 pages, Latex, 2 Figures
|
Phys.Rev. D57 (1998) 4025-4034
|
10.1103/PhysRevD.57.4025
|
TTP96-35, NTZ-24/97
|
hep-ph
| null |
Using impact-factor representation, we consider the lepton pair production by
an incident high-energy photon in a strong electromagnetic field of a nucleus.
By summing leading terms of perturbation series, we obtain a simple formula for
the amplitude, valid to all orders in ${\cal O}(\alpha Z)$ and arbitrary field
of the nucleus. Using these results, we derive, in a simple manner, the results
for the lepton pair production by a virtual incident photon in a Coulomb field.
For real incident photon our results coincide with the known ones. Also, a
particular example of a non-Coulomb potential is discussed in some detail.
|
[
{
"created": "Mon, 15 Sep 1997 18:13:22 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Ivanov",
"Dmitri",
""
],
[
"Melnikov",
"Kirill",
""
]
] |
Using impact-factor representation, we consider the lepton pair production by an incident high-energy photon in a strong electromagnetic field of a nucleus. By summing leading terms of perturbation series, we obtain a simple formula for the amplitude, valid to all orders in ${\cal O}(\alpha Z)$ and arbitrary field of the nucleus. Using these results, we derive, in a simple manner, the results for the lepton pair production by a virtual incident photon in a Coulomb field. For real incident photon our results coincide with the known ones. Also, a particular example of a non-Coulomb potential is discussed in some detail.
|
2307.05425
|
Sean Carroll
|
George B. Field and Sean M. Carroll
|
Axions and Cosmic Magnetic Fields
| null | null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that if axions are the dark matter, their coupling to
electromagnetism results in exponential growth of a helical magnetic field when
the axion field first rolls down its potential. After an inverse cascade, the
relevant length scales to day are of order 10-100 kpc, of astrophysical
interest. Our mechanism for allowing the field to grow relies on a nuance of
MHD. Faraday's Law says that an electric field is needed to create a magnetic
field. Previous authors relied on conventional Ohm's law to calculate E, but
the resistivity is negligible and therefore they assume E is as well. We use a
modified Ohm's Law that includes the effects of self-induction in limiting the
current driven by a given E, which allows a magnetic field to grow.
|
[
{
"created": "Tue, 11 Jul 2023 16:47:41 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2023 18:14:05 GMT",
"version": "v2"
}
] |
2023-07-18
|
[
[
"Field",
"George B.",
""
],
[
"Carroll",
"Sean M.",
""
]
] |
We argue that if axions are the dark matter, their coupling to electromagnetism results in exponential growth of a helical magnetic field when the axion field first rolls down its potential. After an inverse cascade, the relevant length scales to day are of order 10-100 kpc, of astrophysical interest. Our mechanism for allowing the field to grow relies on a nuance of MHD. Faraday's Law says that an electric field is needed to create a magnetic field. Previous authors relied on conventional Ohm's law to calculate E, but the resistivity is negligible and therefore they assume E is as well. We use a modified Ohm's Law that includes the effects of self-induction in limiting the current driven by a given E, which allows a magnetic field to grow.
|
hep-ph/9905379
|
Misha Kalmykov
|
J.Fleischer, M.Yu.Kalmykov, A.V.Kotikov
|
Recursion relations for two-loop self-energy diagrams on-shell
|
Talk given by J.Fleischer at 6th International Workshop on Software
Engineering, Artificial Intelligence, Neural Nets, Genetic Algorithms,
Symbolic Algebra, Automatic Calculation (AIHENP 99), Heraklion, Crete,
Greece, 12-16 April, 1999; 8 pages, LaTeX, 3 eps-figures
| null | null | null |
hep-ph
| null |
A set of recurrence relations for on-shell two-loop self-energy diagrams with
one mass is presented, which allows to reduce the diagrams with arbitrary
indices (powers of scalar propagators) to a set of the master integrals. The
SHELL2 package is used for the calculation of special types of diagrams. A
method of calculation of higher order \epsilon-expansion of master integrals is
demonstrated.
|
[
{
"created": "Tue, 18 May 1999 10:23:18 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Fleischer",
"J.",
""
],
[
"Kalmykov",
"M. Yu.",
""
],
[
"Kotikov",
"A. V.",
""
]
] |
A set of recurrence relations for on-shell two-loop self-energy diagrams with one mass is presented, which allows to reduce the diagrams with arbitrary indices (powers of scalar propagators) to a set of the master integrals. The SHELL2 package is used for the calculation of special types of diagrams. A method of calculation of higher order \epsilon-expansion of master integrals is demonstrated.
|
hep-ph/9808346
|
Eric S. Swanson
|
P.R. Page (LANL), E.S. Swanson (NCSU), and A.P. Szczepaniak (IUB)
|
Hybrid Meson Decay Phenomenology
|
37 pages, 2 figures, 6 tables, Revtex
|
Phys.Rev.D59:034016,1999
|
10.1103/PhysRevD.59.034016
| null |
hep-ph
| null |
The phenomenology of a newly developed model of hybrid meson decay is
developed. The decay mechanism is based on the heavy quark expansion of QCD and
the strong coupling flux tube picture of nonperturbative glue. A comprehensive
list of partial decay widths of a wide variety of light, $s\bar s$, $c\bar c$,
and $b \bar b$ hybrid mesons is presented. Results which appear approximately
universal are highlighted along with those which distinguish different hybrid
decay models. Finally, we examine several interesting hybrid candidates in
detail.
|
[
{
"created": "Mon, 17 Aug 1998 18:47:25 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Page",
"P. R.",
"",
"LANL"
],
[
"Swanson",
"E. S.",
"",
"NCSU"
],
[
"Szczepaniak",
"A. P.",
"",
"IUB"
]
] |
The phenomenology of a newly developed model of hybrid meson decay is developed. The decay mechanism is based on the heavy quark expansion of QCD and the strong coupling flux tube picture of nonperturbative glue. A comprehensive list of partial decay widths of a wide variety of light, $s\bar s$, $c\bar c$, and $b \bar b$ hybrid mesons is presented. Results which appear approximately universal are highlighted along with those which distinguish different hybrid decay models. Finally, we examine several interesting hybrid candidates in detail.
|
hep-ph/9512326
| null |
Hilmar Forkel (ECT*, Trento, Italy)
|
Strangeness in the Nucleon: The Strange Vector Form Factors
|
12 pages (LaTeX), 2 postscript figures, to appear in Prog. Part.
Nucl. Phys. 36 (1996)
|
Prog.Part.Nucl.Phys. 36 (1996) 229-238
|
10.1016/0146-6410(96)00027-0
|
ECT*/Dec/95-004
|
hep-ph nucl-th
| null |
We discuss two descriptions of the nucleon's strange vector form factors in
the framework of vector meson dominance. The first, an updated and extended
version of Jaffe's dispersion analysis, approximates the spectral functions of
the form factors as a sum of vector meson poles, whereas the second combines
vector meson dominance in the $\omega$ and $\phi$ meson sector with an
intrinsic strangeness distribution from a kaon cloud. (Plenary talk given at
the International School for Nuclear Physics, 17th Course: Quarks and Hadrons
in Nuclei, Erice, Sicily, Sept 19-27, 1995.)
|
[
{
"created": "Mon, 18 Dec 1995 04:30:46 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Forkel",
"Hilmar",
"",
"ECT*, Trento, Italy"
]
] |
We discuss two descriptions of the nucleon's strange vector form factors in the framework of vector meson dominance. The first, an updated and extended version of Jaffe's dispersion analysis, approximates the spectral functions of the form factors as a sum of vector meson poles, whereas the second combines vector meson dominance in the $\omega$ and $\phi$ meson sector with an intrinsic strangeness distribution from a kaon cloud. (Plenary talk given at the International School for Nuclear Physics, 17th Course: Quarks and Hadrons in Nuclei, Erice, Sicily, Sept 19-27, 1995.)
|
hep-ph/0605257
|
Hans-Ulrich Martyn
|
H.-U. Martyn
|
Detecting metastable staus and gravitinos at the ILC
|
13 pages, 5 figures
|
Eur.Phys.J.C48:15-24,2006
|
10.1140/epjc/s2006-02630-7
|
DESY 06-075
|
hep-ph
| null |
A study of various SUSY scenarios is presented in which the lightest
supersymmetric particle is the gravitino $\sG$ and the next-to-lightest
supersymmetric particle is a scalar tau $\stau$ with lifetimes ranging from
seconds to years. Gravitinos are interesting dark matter candidates which can
be produced in decays of heavier sparticles at the International Linear
Collider (ILC), but remain undetected in direct searches of astrophysical
experiments. We investigate the detection and measurement of metastable staus,
which may be copiously produced at the ILC either directly or via cascade
decays. A proper choice of the experimental conditions will allow one to stop
large samples of staus in the calorimeters of the ILC detector and to study the
subsequent decays $\stau\to\tau\sG$. Detailed simulations show that the
properties of the stau and the gravitino, such as stau mass and lifetime and
gravitino mass, can be accurately determined at a future ILC and may provide
direct access to the gravitational coupling, respectively Planck scale.
|
[
{
"created": "Wed, 24 May 2006 12:55:30 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Martyn",
"H. -U.",
""
]
] |
A study of various SUSY scenarios is presented in which the lightest supersymmetric particle is the gravitino $\sG$ and the next-to-lightest supersymmetric particle is a scalar tau $\stau$ with lifetimes ranging from seconds to years. Gravitinos are interesting dark matter candidates which can be produced in decays of heavier sparticles at the International Linear Collider (ILC), but remain undetected in direct searches of astrophysical experiments. We investigate the detection and measurement of metastable staus, which may be copiously produced at the ILC either directly or via cascade decays. A proper choice of the experimental conditions will allow one to stop large samples of staus in the calorimeters of the ILC detector and to study the subsequent decays $\stau\to\tau\sG$. Detailed simulations show that the properties of the stau and the gravitino, such as stau mass and lifetime and gravitino mass, can be accurately determined at a future ILC and may provide direct access to the gravitational coupling, respectively Planck scale.
|
1405.4706
|
Diego Aristizabal
|
D. Aristizabal Sierra, M. Tortola, J. W. F. Valle, A. Vicente
|
Leptogenesis with a dynamical seesaw scale
|
16 pages, 7 figures. V2: few clarifications and references added.
Matches published version in JCAP
|
JCAP07(2014)052
|
10.1088/1475-7516/2014/07/052
|
IFIC/14-33
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the simplest type-I seesaw leptogenesis scenario right-handed neutrino
annihilation processes are absent. However, in the presence of new interactions
these processes are possible and can affect the resulting $B-L$ asymmetry in an
important way. A prominent example is provided by models with spontaneous
lepton number violation, where the existence of new dynamical degrees of
freedom can play a crucial role. In this context, we provide a
model-independent discussion of the effects of right-handed neutrino
annihilations. We show that in the weak washout regime, as long as the
scattering processes remain slow compared with the Hubble expansion rate
throughout the relevant temperature range, the efficiency can be largely
enhanced, reaching in some cases maximal values. Moreover, the $B-L$ asymmetry
yield turns out to be independent upon initial conditions, in contrast to the
"standard" case. On the other hand, when the annihilation processes are fast,
the right-handed neutrino distribution tends to a thermal one down to low
temperatures, implying a drastic suppression of the efficiency which in some
cases can render the $B-L$ generation mechanism inoperative.
|
[
{
"created": "Mon, 19 May 2014 13:03:03 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2014 09:51:42 GMT",
"version": "v2"
}
] |
2014-08-01
|
[
[
"Sierra",
"D. Aristizabal",
""
],
[
"Tortola",
"M.",
""
],
[
"Valle",
"J. W. F.",
""
],
[
"Vicente",
"A.",
""
]
] |
In the simplest type-I seesaw leptogenesis scenario right-handed neutrino annihilation processes are absent. However, in the presence of new interactions these processes are possible and can affect the resulting $B-L$ asymmetry in an important way. A prominent example is provided by models with spontaneous lepton number violation, where the existence of new dynamical degrees of freedom can play a crucial role. In this context, we provide a model-independent discussion of the effects of right-handed neutrino annihilations. We show that in the weak washout regime, as long as the scattering processes remain slow compared with the Hubble expansion rate throughout the relevant temperature range, the efficiency can be largely enhanced, reaching in some cases maximal values. Moreover, the $B-L$ asymmetry yield turns out to be independent upon initial conditions, in contrast to the "standard" case. On the other hand, when the annihilation processes are fast, the right-handed neutrino distribution tends to a thermal one down to low temperatures, implying a drastic suppression of the efficiency which in some cases can render the $B-L$ generation mechanism inoperative.
|
hep-ph/0102246
|
Jeonghyeon Song
|
Chun Liu (ITP, Beijing) and Jeonghyeon Song (KIAS)
|
A Model for Neutrino Warm Dark Matter and Neutrino Oscillations
|
11 pages, Final version to appear in PLB, References added
|
Phys.Lett. B512 (2001) 247-251
|
10.1016/S0370-2693(01)00730-4
|
ASITP-2001-002 and KIAS-P01007
|
hep-ph
| null |
The muon- and tau-neutrinos with the mass in the keV range, which are allowed
in a low reheating temperature cosmology, can compose the warm dark matter of
the universe. A model of four light neutrinos including the keV scale $\nu_\mu$
and $\nu_\tau$ is studied, which combines the seesaw mechanism and the Abelian
flavor symmetry. The atmospheric neutrino anomaly is due to the
$\nu_\mu-\nu_\tau$ oscillation. The solar neutrino problem is answered by the
oscillation into the light sterile neutrino, where the SMA, LMA, and LOW-QVO
solutions can be accommodated in our scenario.
|
[
{
"created": "Tue, 20 Feb 2001 06:13:16 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2001 00:32:27 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jun 2001 01:42:13 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Liu",
"Chun",
"",
"ITP, Beijing"
],
[
"Song",
"Jeonghyeon",
"",
"KIAS"
]
] |
The muon- and tau-neutrinos with the mass in the keV range, which are allowed in a low reheating temperature cosmology, can compose the warm dark matter of the universe. A model of four light neutrinos including the keV scale $\nu_\mu$ and $\nu_\tau$ is studied, which combines the seesaw mechanism and the Abelian flavor symmetry. The atmospheric neutrino anomaly is due to the $\nu_\mu-\nu_\tau$ oscillation. The solar neutrino problem is answered by the oscillation into the light sterile neutrino, where the SMA, LMA, and LOW-QVO solutions can be accommodated in our scenario.
|
hep-ph/0009201
|
Maria Krawczyk
|
Maria Krawczyk (Institute of Theoretical Physics, University of
Warsaw, Poland), Jan Zochowski (Bialystok University, Poland) and Peter
Mattig (Weizmann Institute, Rehovot, Israel)
|
The light Higgs window in the 2HDM at GigaZ
|
Latex file, 11 pages, 6 ps figures
|
Eur.Phys.J.C19:463-469,2001
|
10.1007/s100520100585
|
IFT-2000-22
|
hep-ph
| null |
The sensitivity to a light Higgs boson in the general 2HDM (II), with a mass
below 40 GeV, is estimated for an future e+e- linear collider operating with
very high luminosity at the Z peak (GigaZ). We consider a possible Higgs boson
production via the Bjorken process, the (hA) pair production, the Yukawa
process Z -> b {\bar b} h(A), -> tau {\bar tau} h(A), and the decay Z
->h(A)+gamma. Although the discovery potential is considerably extended
compared to the current sensitivities, mainly from LEP, the existence of a h or
A even with a mass of a few GeV cannot be excluded with two billion Z decays.
The need to study the very light Higgs scenario at a linear e+e- collider
running at several hundred GeV and the LHC is emphasised.
|
[
{
"created": "Sun, 17 Sep 2000 15:04:29 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Krawczyk",
"Maria",
"",
"Institute of Theoretical Physics, University of\n Warsaw, Poland"
],
[
"Zochowski",
"Jan",
"",
"Bialystok University, Poland"
],
[
"Mattig",
"Peter",
"",
"Weizmann Institute, Rehovot, Israel"
]
] |
The sensitivity to a light Higgs boson in the general 2HDM (II), with a mass below 40 GeV, is estimated for an future e+e- linear collider operating with very high luminosity at the Z peak (GigaZ). We consider a possible Higgs boson production via the Bjorken process, the (hA) pair production, the Yukawa process Z -> b {\bar b} h(A), -> tau {\bar tau} h(A), and the decay Z ->h(A)+gamma. Although the discovery potential is considerably extended compared to the current sensitivities, mainly from LEP, the existence of a h or A even with a mass of a few GeV cannot be excluded with two billion Z decays. The need to study the very light Higgs scenario at a linear e+e- collider running at several hundred GeV and the LHC is emphasised.
|
1903.04151
|
Laurent Schoeffel
|
C. Baldenegro, S. Hassani, C. Royon, L. Schoeffel
|
Extending the constraint for axion-like particles as resonances at the
LHC and laser beam experiments
|
23 pages, 4 figures, 1 table
|
Phys Lett B, PLB34704, 2019
|
10.1016/j.physletb.2019.06.029
| null |
hep-ph physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the discovery potential of axion-like particles (ALP),
pseudo-scalars weakly coupled to Standard Model fields, at the Large Hadron
Collider (LHC). Our focus is on ALPs coupled to the electromagnetic field,
which would induce anomalous scattering of light-by-light. This can be directly
probed in central exclusive production of photon pairs in ultra-peripheral
collisions at the LHC in proton and heavy ion collisions. We consider
non-standard collision modes of the LHC, such as argon-argon collisions at
$\sqrt{s_{NN}} = 7$ TeV and proton-lead collisions at $\sqrt{s_{NN}} = 8.16$
TeV to access regions in the parameter space complementary to the ones
previously considered for lead-lead or proton-proton collisions. In addition,
we show that, using laser beam interactions, we can constrain ALPs as resonant
deviations in the refractive index, induced by anomalous light-by-light
scattering effects. If we combine the aforementioned approaches, ALPs can be
probed in a wide range of masses from the eV scale up to the TeV scale.
|
[
{
"created": "Mon, 11 Mar 2019 07:36:22 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2019 15:42:00 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jun 2019 19:44:06 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Jun 2019 07:14:04 GMT",
"version": "v4"
}
] |
2019-06-20
|
[
[
"Baldenegro",
"C.",
""
],
[
"Hassani",
"S.",
""
],
[
"Royon",
"C.",
""
],
[
"Schoeffel",
"L.",
""
]
] |
We study the discovery potential of axion-like particles (ALP), pseudo-scalars weakly coupled to Standard Model fields, at the Large Hadron Collider (LHC). Our focus is on ALPs coupled to the electromagnetic field, which would induce anomalous scattering of light-by-light. This can be directly probed in central exclusive production of photon pairs in ultra-peripheral collisions at the LHC in proton and heavy ion collisions. We consider non-standard collision modes of the LHC, such as argon-argon collisions at $\sqrt{s_{NN}} = 7$ TeV and proton-lead collisions at $\sqrt{s_{NN}} = 8.16$ TeV to access regions in the parameter space complementary to the ones previously considered for lead-lead or proton-proton collisions. In addition, we show that, using laser beam interactions, we can constrain ALPs as resonant deviations in the refractive index, induced by anomalous light-by-light scattering effects. If we combine the aforementioned approaches, ALPs can be probed in a wide range of masses from the eV scale up to the TeV scale.
|
hep-ph/0202229
|
Alexander D. Smirnov
|
A.D. Smirnov (Yaroslavl State University, Russia)
|
Bounds on scalar leptoquark and scalar gluon masses from S, T, U in the
minimal four color symmetry model
|
14 pages, 2 figures, to appear in Physics Letters B
|
Phys.Lett. B531 (2002) 237-244
|
10.1016/S0370-2693(02)01432-6
|
YARU-HE-02/01
|
hep-ph
| null |
The contributions into radiative correction parameters S, T, U from scalar
leptoquark and scalar gluon doublets are investigated in the minimal four color
symmetry model. It is shown that the current experimental data on S, T, U allow
the scalar leptoquarks and the scalar gluons to be relatively light (with
masses of order of 1 TeV or less), the lightest particles are preferred to lie
below 400 GeV. In particular, the lightest scalar leptoquarks with masses below
300 GeV are shown to be compatible with the current data on S, T, U at $\chi^2
< 3.1 (3.2)$ for $m_H = 115 (300) GeV$ in comparison with $\chi^2 = 3.5 (5.0)$
in the Standard Model. The lightest scalar gluon in this case is expected to
lie below 850 (720) GeV. The possible significance of such particles in the
t-quark physics at LHC is emphasized.
|
[
{
"created": "Mon, 25 Feb 2002 14:05:38 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Smirnov",
"A. D.",
"",
"Yaroslavl State University, Russia"
]
] |
The contributions into radiative correction parameters S, T, U from scalar leptoquark and scalar gluon doublets are investigated in the minimal four color symmetry model. It is shown that the current experimental data on S, T, U allow the scalar leptoquarks and the scalar gluons to be relatively light (with masses of order of 1 TeV or less), the lightest particles are preferred to lie below 400 GeV. In particular, the lightest scalar leptoquarks with masses below 300 GeV are shown to be compatible with the current data on S, T, U at $\chi^2 < 3.1 (3.2)$ for $m_H = 115 (300) GeV$ in comparison with $\chi^2 = 3.5 (5.0)$ in the Standard Model. The lightest scalar gluon in this case is expected to lie below 850 (720) GeV. The possible significance of such particles in the t-quark physics at LHC is emphasized.
|
2107.03025
|
Jason Evans
|
John Ellis, Jason L. Evans, Natsumi Nagata, Dimitri V. Nanopoulos and
Keith A. Olive
|
Flipped $g_\mu-2$
|
17 pages, 5 figures
| null |
10.1140/epjc/s10052-021-09829-8
|
KCL-PH-TH/2021-46,CERN-TH-2021-099, ACT-1-21, MI-HET-751,
UMN-TH-4018/21, FTPI-MINN-21/11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the possible magnitude of the supersymmetric contribution to
$g_\mu - 2$ in a flipped SU(5) GUT model. Unlike other GUT models which are
severely constrained by universality relations, in flipped SU(5) the U(1)
gaugino mass and the soft supersymmetry-breaking masses of right-handed
sleptons are unrelated to the other gaugino, slepton and squark masses.
Consequently, the lightest neutralino and the right-handed smuon may be light
enough to mitigate the discrepancy between the experimental measurement of
$g_\mu - 2$ and the Standard Model calculation, in which case they may be
detectable at the LHC and/or a 250 GeV $e^+ e^-$ collider, whereas the other
gauginos and sfermions are heavy enough to escape detection at the LHC.
|
[
{
"created": "Wed, 7 Jul 2021 05:47:53 GMT",
"version": "v1"
}
] |
2021-12-22
|
[
[
"Ellis",
"John",
""
],
[
"Evans",
"Jason L.",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
],
[
"Olive",
"Keith A.",
""
]
] |
We analyze the possible magnitude of the supersymmetric contribution to $g_\mu - 2$ in a flipped SU(5) GUT model. Unlike other GUT models which are severely constrained by universality relations, in flipped SU(5) the U(1) gaugino mass and the soft supersymmetry-breaking masses of right-handed sleptons are unrelated to the other gaugino, slepton and squark masses. Consequently, the lightest neutralino and the right-handed smuon may be light enough to mitigate the discrepancy between the experimental measurement of $g_\mu - 2$ and the Standard Model calculation, in which case they may be detectable at the LHC and/or a 250 GeV $e^+ e^-$ collider, whereas the other gauginos and sfermions are heavy enough to escape detection at the LHC.
|
hep-ph/0701073
|
Sergo Gerasimov
|
S.B. Gerasimov (Dubna, JINR)
|
Dispersion total photoproduction sum rules for nucleons and few-body
nuclei revisited
|
8 pages, Latex; The report presented at Advanced Studies Institute:
Symmetries and Spin (SPIN-Praha-2006), Prague, Czech Republic, 19-26 Jul 2006
|
Czech.J.Phys.56:F195-F201,2006
| null | null |
hep-ph
| null |
The questions on the presense and quantitative role of the constant terms in
the real part of the high-energy photon-nucleon and photon-nucleus amplitudes
representing the contribution of the non-Regge (the fixed j=0-pole)
singularities in the finite-energy sum rules (FESR) for the photoabsorption
cross sections on nucleons and the lightest atomic nuclei are discussed and new
testable relations are presented for relevant combinations of the Compton
scattering amplitudes.
|
[
{
"created": "Wed, 10 Jan 2007 09:44:01 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Gerasimov",
"S. B.",
"",
"Dubna, JINR"
]
] |
The questions on the presense and quantitative role of the constant terms in the real part of the high-energy photon-nucleon and photon-nucleus amplitudes representing the contribution of the non-Regge (the fixed j=0-pole) singularities in the finite-energy sum rules (FESR) for the photoabsorption cross sections on nucleons and the lightest atomic nuclei are discussed and new testable relations are presented for relevant combinations of the Compton scattering amplitudes.
|
hep-ph/0607155
|
Thomas Schwetz
|
S.T. Petcov, T. Schwetz
|
Precision measurement of solar neutrino oscillation parameters by a
long-baseline reactor neutrino experiment in Europe
|
16 pages, 6 figures
|
Phys.Lett.B642:487-494,2006
|
10.1016/j.physletb.2006.09.063
|
SISSA 40/2006/EP
|
hep-ph hep-ex
| null |
We consider the determination of the solar neutrino oscillation parameters
$\Delta m^2_{21}$ and $\theta_{12}$ by studying oscillations of reactor
anti-neutrinos emitted by nuclear power plants (located mainly in France) with
a detector installed in the Frejus underground laboratory. The performances of
a water Cerenkov detector of 147 kt fiducial mass doped with 0.1% of Gadolinium
(MEMPHYS-Gd) and of a 50 kt scale liquid scintillator detector (LENA) are
compared. In both cases 3$\sigma$ uncertainties below 3% on $\Delta m^2_{21}$
and of about 20% on $\sin^2\theta_{12}$ can be obtained after one year of data
taking. The Gadolinium doped Super-Kamiokande detector (SK-Gd) in Japan can
reach a similar precision if the SK/MEMPHYS fiducial mass ratio of 1 to 7 is
compensated by a longer SK-Gd data taking time. Several years of reactor
neutrino data collected by MEMPHYS-Gd or LENA would allow a determination of
$\Delta m^2_{21}$ and $\sin^2\theta_{12}$ with uncertainties of approximately
1% and 10% at 3$\sigma$, respectively. These accuracies are comparable to those
that can be reached in the measurement of the atmospheric neutrino oscillation
parameters $\Delta m^2_{31}$ and $\sin^2\theta_{23}$ in long-baseline superbeam
experiments.
|
[
{
"created": "Thu, 13 Jul 2006 16:34:14 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Petcov",
"S. T.",
""
],
[
"Schwetz",
"T.",
""
]
] |
We consider the determination of the solar neutrino oscillation parameters $\Delta m^2_{21}$ and $\theta_{12}$ by studying oscillations of reactor anti-neutrinos emitted by nuclear power plants (located mainly in France) with a detector installed in the Frejus underground laboratory. The performances of a water Cerenkov detector of 147 kt fiducial mass doped with 0.1% of Gadolinium (MEMPHYS-Gd) and of a 50 kt scale liquid scintillator detector (LENA) are compared. In both cases 3$\sigma$ uncertainties below 3% on $\Delta m^2_{21}$ and of about 20% on $\sin^2\theta_{12}$ can be obtained after one year of data taking. The Gadolinium doped Super-Kamiokande detector (SK-Gd) in Japan can reach a similar precision if the SK/MEMPHYS fiducial mass ratio of 1 to 7 is compensated by a longer SK-Gd data taking time. Several years of reactor neutrino data collected by MEMPHYS-Gd or LENA would allow a determination of $\Delta m^2_{21}$ and $\sin^2\theta_{12}$ with uncertainties of approximately 1% and 10% at 3$\sigma$, respectively. These accuracies are comparable to those that can be reached in the measurement of the atmospheric neutrino oscillation parameters $\Delta m^2_{31}$ and $\sin^2\theta_{23}$ in long-baseline superbeam experiments.
|
0704.1153
|
Feng Yuan
|
Jian-Wei Qiu, Werner Vogelsang, Feng Yuan
|
Asymmetric Di-jet Production in Polarized Hadronic Collisions
|
11 pages, 2 figures
|
Phys.Lett.B650:373-378,2007
|
10.1016/j.physletb.2007.05.023
|
BNL-NT-07/15, RBRC-665
|
hep-ph
| null |
Using the collinear QCD factorization approach, we study the
single-transverse-spin dependent cross section Delta sigma(S_perp) for the
hadronic production of two jets of momenta P_1=P+q/2 and P_2=-P+q/2. We
consider the kinematic region where the transverse components of the momentum
vectors satisfy P_perp >> q_perp >> Lambda_QCD. For the case of initial-state
gluon radiation, we show that at the leading power in q_perp/P_perp and at the
lowest non-trivial perturbative order, the dependence of Delta sigma(S_perp) on
q_perp decouples from that on P_perp, so that the cross section can be
factorized into a hard part that is a function only of the single scale P_perp,
and into perturbatively generated transverse-momentum dependent (TMD) parton
distributions with transverse momenta k_perp = O(q_perp).
|
[
{
"created": "Mon, 9 Apr 2007 22:12:23 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Qiu",
"Jian-Wei",
""
],
[
"Vogelsang",
"Werner",
""
],
[
"Yuan",
"Feng",
""
]
] |
Using the collinear QCD factorization approach, we study the single-transverse-spin dependent cross section Delta sigma(S_perp) for the hadronic production of two jets of momenta P_1=P+q/2 and P_2=-P+q/2. We consider the kinematic region where the transverse components of the momentum vectors satisfy P_perp >> q_perp >> Lambda_QCD. For the case of initial-state gluon radiation, we show that at the leading power in q_perp/P_perp and at the lowest non-trivial perturbative order, the dependence of Delta sigma(S_perp) on q_perp decouples from that on P_perp, so that the cross section can be factorized into a hard part that is a function only of the single scale P_perp, and into perturbatively generated transverse-momentum dependent (TMD) parton distributions with transverse momenta k_perp = O(q_perp).
|
hep-ph/0209198
|
Klaus Werner
|
K. Werner, H.J. Drescher, S.Ostapchenko, T.Pierog
|
The Nexus Model
|
Invited talk given at the International Workshop on the Physics of
the Quark Gluon Plasma, Palaiseau, France, September 4-7, 2001
| null | null | null |
hep-ph
| null |
The interpretation of experimental results at RHIC and in the future also at
LHC requires very reliable and realistic models.
Considerable effort has been devoted to the development of such models during
the past decade, many of them being heavily used in order to analyze data.
There are, however, serious inconsistencies in the above-mentioned approaches.
In this paper, we will introduce a fully self-consistent formulation of the
multiple-scattering scheme in the framework of a Gribov-Regge type effective
theory.
|
[
{
"created": "Wed, 18 Sep 2002 09:09:56 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Werner",
"K.",
""
],
[
"Drescher",
"H. J.",
""
],
[
"Ostapchenko",
"S.",
""
],
[
"Pierog",
"T.",
""
]
] |
The interpretation of experimental results at RHIC and in the future also at LHC requires very reliable and realistic models. Considerable effort has been devoted to the development of such models during the past decade, many of them being heavily used in order to analyze data. There are, however, serious inconsistencies in the above-mentioned approaches. In this paper, we will introduce a fully self-consistent formulation of the multiple-scattering scheme in the framework of a Gribov-Regge type effective theory.
|
hep-ph/0212027
|
Pavel Pobylitsa
|
P. V. Pobylitsa
|
T-odd quark distributions: QCD versus chiral models
|
3 pages
| null | null | null |
hep-ph
| null |
The T-odd quark distrbutions are shown to vanish in the chiral sigma model in
contrast to the opposite widespread opinion. This failure of the chiral sigma
model is a feature of the model itself and has nothing to do with the recent
progress in the clarification of the status of the T-odd distributions in QCD.
|
[
{
"created": "Mon, 2 Dec 2002 20:48:12 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2002 14:05:05 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Pobylitsa",
"P. V.",
""
]
] |
The T-odd quark distrbutions are shown to vanish in the chiral sigma model in contrast to the opposite widespread opinion. This failure of the chiral sigma model is a feature of the model itself and has nothing to do with the recent progress in the clarification of the status of the T-odd distributions in QCD.
|
hep-ph/9811280
|
Juan Carlos Montero
|
J. C. Montero, V. Pleitez and O. Ravinez (Instituto de Fisica Teorica,
IFT-UNESP)
|
Soft superweak CP violation in a 331 model
|
REVTEX, 21 pages, 10 eps figures
|
Phys.Rev. D60 (1999) 076003
|
10.1103/PhysRevD.60.076003
|
IFT-P.082/98
|
hep-ph
| null |
We show that it is possible to implement soft superweak CP violation in the
context of a 331 model with only three triplets. All CP violation effects come
from the exchange of singly and doubly charged scalars. We consider the
implication of this mechanism in the quark and lepton sectors. In particular it
is shown that in this model, as in most of those which incorporate the scalar
mediated CP violation, it is possible to have large electric dipole moments for
the muon and the tau lepton while keeping small those of the electron and the
neutron. The CKM mixing matrix is real up to the two loop level.
|
[
{
"created": "Mon, 9 Nov 1998 18:49:57 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Montero",
"J. C.",
"",
"Instituto de Fisica Teorica,\n IFT-UNESP"
],
[
"Pleitez",
"V.",
"",
"Instituto de Fisica Teorica,\n IFT-UNESP"
],
[
"Ravinez",
"O.",
"",
"Instituto de Fisica Teorica,\n IFT-UNESP"
]
] |
We show that it is possible to implement soft superweak CP violation in the context of a 331 model with only three triplets. All CP violation effects come from the exchange of singly and doubly charged scalars. We consider the implication of this mechanism in the quark and lepton sectors. In particular it is shown that in this model, as in most of those which incorporate the scalar mediated CP violation, it is possible to have large electric dipole moments for the muon and the tau lepton while keeping small those of the electron and the neutron. The CKM mixing matrix is real up to the two loop level.
|
1010.5217
|
Antonio Pich
|
Antonio Pich
|
Flavour constraints on multi-Higgs-doublet models: Yukawa alignment
|
6 pages, 5 figures. Talk given in the "Third Workshop on Theory,
Phenomenology and Experiments in Heavy Flavour Physics" (Capri, 5-7 July
2010)
|
Nucl.Phys.Proc.Suppl.209:182-187,2010
|
10.1016/j.nuclphysbps.2010.12.030
|
IFIC/10-41, FTUV/10-1025
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In multi-Higgs-doublet models, the alignment in flavour space of all Yukawa
matrices coupling to a given right-handed fermion guarantees the absence of
tree-level flavour-changing neutral couplings, while introducing new sources of
CP violation. With N Higgs doublets (and no right-handed neutrinos) the Yukawa
Lagrangian is characterized by the fermion masses, the CKM quark mixing matrix
and 3(N-1) complex couplings. Quantum corrections break the alignment,
generating a minimal-flavour-violation structure with flavour-blind phases. The
aligned multi-Higgs-doublet models lead to a rich and viable phenomenology with
an interesting hierarchy of flavour-changing neutral current effects,
suppressing them in light-quark systems while allowing potentially relevant
signals in heavy-quark transitions.
|
[
{
"created": "Mon, 25 Oct 2010 18:34:56 GMT",
"version": "v1"
}
] |
2011-04-05
|
[
[
"Pich",
"Antonio",
""
]
] |
In multi-Higgs-doublet models, the alignment in flavour space of all Yukawa matrices coupling to a given right-handed fermion guarantees the absence of tree-level flavour-changing neutral couplings, while introducing new sources of CP violation. With N Higgs doublets (and no right-handed neutrinos) the Yukawa Lagrangian is characterized by the fermion masses, the CKM quark mixing matrix and 3(N-1) complex couplings. Quantum corrections break the alignment, generating a minimal-flavour-violation structure with flavour-blind phases. The aligned multi-Higgs-doublet models lead to a rich and viable phenomenology with an interesting hierarchy of flavour-changing neutral current effects, suppressing them in light-quark systems while allowing potentially relevant signals in heavy-quark transitions.
|
2106.13857
|
Manoranjan Dutta
|
Manoranjan Dutta (1), Subhaditya Bhattacharya (2), Purusottam Ghosh
(3), Narendra Sahu (1) ((1) Indian Institute of Technology Hyderabad, (2)
Indian Institute of Technology Guwahati (3) Harish-Chandra Research
Institute, Allahabad)
|
Majorana Dark Matter and Neutrino mass in a singlet-doublet extension of
the Standard Model
|
DAE-BRNS-HEP symposium 2020 Proccedings
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A minimal extension of the Standard Model (SM) by a vector-like fermion
doublet and three right handed (RH) singlet neutrinos is proposed in order to
explain dark matter and tiny neutrino mass simultaneously. The DM arises as a
mixture of the neutral component of the fermion doublet and one of the RH
neutrinos, both assumed to be odd under an imposed $\mathcal{Z}_2$ symmetry.
Being Majorana in nature, the DM escapes from $Z$-mediated direct search
constraints to mark a significant difference from singlet-doublet Dirac DM. The
other two $\mathcal{Z}_2$ even heavy RH neutrinos give rise masses and mixing
of light neutrinos via Type-I Seesaw mechanism. Relic density and direct search
allowed parameter space for the model is investigated through detailed
numerical scan.
|
[
{
"created": "Fri, 25 Jun 2021 19:31:04 GMT",
"version": "v1"
}
] |
2021-06-29
|
[
[
"Dutta",
"Manoranjan",
""
],
[
"Bhattacharya",
"Subhaditya",
""
],
[
"Ghosh",
"Purusottam",
""
],
[
"Sahu",
"Narendra",
""
]
] |
A minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right handed (RH) singlet neutrinos is proposed in order to explain dark matter and tiny neutrino mass simultaneously. The DM arises as a mixture of the neutral component of the fermion doublet and one of the RH neutrinos, both assumed to be odd under an imposed $\mathcal{Z}_2$ symmetry. Being Majorana in nature, the DM escapes from $Z$-mediated direct search constraints to mark a significant difference from singlet-doublet Dirac DM. The other two $\mathcal{Z}_2$ even heavy RH neutrinos give rise masses and mixing of light neutrinos via Type-I Seesaw mechanism. Relic density and direct search allowed parameter space for the model is investigated through detailed numerical scan.
|
1207.4861
|
Gilad Perez
|
Gian F. Giudice, Gilad Perez, Yotam Soreq
|
Flavor Beyond the Standard Universe
|
12 pages, 4 figures
| null | null |
CERN-PH-TH/2012-202
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the possibility that the observed pattern of quark masses is the
consequence of a statistical distribution of Yukawa couplings within the
multiverse. We employ the anthropic condition that only two ultra light quarks
exist, justifying the observed richness of organic chemistry. Moreover, the
mass of the recently discovered Higgs boson suggests that the top Yukawa
coupling lies near the critical condition where the electroweak vacuum becomes
unstable, leading to a new kind of flavor puzzle and to a new anthropic
condition. We scan Yukawa couplings according to distributions motivated by
high-scale flavor dynamics and find cases in which our pattern of quark masses
has a plausible probability within the multiverse. Finally we show that, under
some assumptions, these distributions can significantly ameliorate the runaway
behavior leading to weakless universes.
|
[
{
"created": "Fri, 20 Jul 2012 07:14:29 GMT",
"version": "v1"
}
] |
2012-07-23
|
[
[
"Giudice",
"Gian F.",
""
],
[
"Perez",
"Gilad",
""
],
[
"Soreq",
"Yotam",
""
]
] |
We explore the possibility that the observed pattern of quark masses is the consequence of a statistical distribution of Yukawa couplings within the multiverse. We employ the anthropic condition that only two ultra light quarks exist, justifying the observed richness of organic chemistry. Moreover, the mass of the recently discovered Higgs boson suggests that the top Yukawa coupling lies near the critical condition where the electroweak vacuum becomes unstable, leading to a new kind of flavor puzzle and to a new anthropic condition. We scan Yukawa couplings according to distributions motivated by high-scale flavor dynamics and find cases in which our pattern of quark masses has a plausible probability within the multiverse. Finally we show that, under some assumptions, these distributions can significantly ameliorate the runaway behavior leading to weakless universes.
|
hep-ph/0005151
|
Ed Stoeffhaas
|
D. Zeppenfeld
|
Measurement of Higgs Properties at the LHC
|
6 pages, Revtex (singlespaced), uses epsfig.sty, 1 postscript figure.
Talk given at the 35th Rencontres de Moriond, QCD and High Energy Hadronic
Interactions, Les Arcs, France, March 18-25, 2000
| null | null |
MADPH-00-1179
|
hep-ph
| null |
A SM-like Higgs boson can be produced in a variety of channels at the LHC. By
combining information from production via gluon fusion and weak boson fusion,
various partial widths and the total Higgs boson width can be extracted.
Expected accuracies for 200 fb^{-1} of data are in the 10% range.
|
[
{
"created": "Tue, 16 May 2000 16:31:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Zeppenfeld",
"D.",
""
]
] |
A SM-like Higgs boson can be produced in a variety of channels at the LHC. By combining information from production via gluon fusion and weak boson fusion, various partial widths and the total Higgs boson width can be extracted. Expected accuracies for 200 fb^{-1} of data are in the 10% range.
|
1403.3970
|
Carlos Louren\c{c}o
|
Pietro Faccioli, Valentin Knuenz, Carlos Lourenco, Joao Seixas,
Hermine K. Woehri
|
Quarkonium production in the LHC era: a polarized perspective
|
Submitted to Phys. Lett. B
| null |
10.1016/j.physletb.2014.07.006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Polarization measurements are usually considered as the most difficult
challenge for the QCD description of quarkonium production. In fact, global
data fits for the determination of the non-perturbative parameters of
bound-state formation traditionally exclude polarization observables and use
them as a posteriori verifications of the predictions, with perplexing results.
With a change of perspective, we move polarization data to the centre of the
study, advocating that they actually provide the strongest fundamental
indications about the production mechanisms, even before we explicitly consider
perturbative calculations.
Considering psi(2S) and Y(3S) measurements from LHC experiments and
state-of-the-art NLO short-distance calculations in the framework of
non-relativistic QCD factorization (NRQCD), we perform a search for a kinematic
domain where the polarizations can be correctly reproduced together with the
cross sections, by systematically scanning the phase space and accurately
treating the experimental uncertainties. This strategy provides a
straightforward solution to the "quarkonium polarization puzzle" and reassuring
signs that the theoretical framework is reliable. At the same time, the results
expose unexpected hierarchies in the non-perturbative NRQCD parameters, that
open new paths towards the understanding of bound-state formation in QCD.
|
[
{
"created": "Sun, 16 Mar 2014 22:43:23 GMT",
"version": "v1"
}
] |
2015-06-19
|
[
[
"Faccioli",
"Pietro",
""
],
[
"Knuenz",
"Valentin",
""
],
[
"Lourenco",
"Carlos",
""
],
[
"Seixas",
"Joao",
""
],
[
"Woehri",
"Hermine K.",
""
]
] |
Polarization measurements are usually considered as the most difficult challenge for the QCD description of quarkonium production. In fact, global data fits for the determination of the non-perturbative parameters of bound-state formation traditionally exclude polarization observables and use them as a posteriori verifications of the predictions, with perplexing results. With a change of perspective, we move polarization data to the centre of the study, advocating that they actually provide the strongest fundamental indications about the production mechanisms, even before we explicitly consider perturbative calculations. Considering psi(2S) and Y(3S) measurements from LHC experiments and state-of-the-art NLO short-distance calculations in the framework of non-relativistic QCD factorization (NRQCD), we perform a search for a kinematic domain where the polarizations can be correctly reproduced together with the cross sections, by systematically scanning the phase space and accurately treating the experimental uncertainties. This strategy provides a straightforward solution to the "quarkonium polarization puzzle" and reassuring signs that the theoretical framework is reliable. At the same time, the results expose unexpected hierarchies in the non-perturbative NRQCD parameters, that open new paths towards the understanding of bound-state formation in QCD.
|
hep-ph/0209231
|
Andreas S. Kronfeld
|
Andreas S. Kronfeld
|
Progress in Lattice QCD
|
Invited talk at the XXII Physics in Collisions Conference (PIC02),
Stanford, Ca, USA, June 2002, 15+1 pp. PSN FRBT05
|
eConfC020620:FRBT05,2002
| null |
FERMILAB-Conf-02/228-T
|
hep-ph hep-lat
| null |
After reviewing some of the mathematical foundations and numerical
difficulties facing lattice QCD, I review the status of several calculations
relevant to experimental high-energy physics. The topics considered are moments
of structure functions, which may prove relevant to search for new phenomena at
the LHC, and several aspects of flavor physics, which are relevant to
understanding CP and flavor violation.
|
[
{
"created": "Thu, 19 Sep 2002 19:25:01 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kronfeld",
"Andreas S.",
""
]
] |
After reviewing some of the mathematical foundations and numerical difficulties facing lattice QCD, I review the status of several calculations relevant to experimental high-energy physics. The topics considered are moments of structure functions, which may prove relevant to search for new phenomena at the LHC, and several aspects of flavor physics, which are relevant to understanding CP and flavor violation.
|
2203.09407
|
Paul Caucal
|
Paul Caucal, Yacine Mehtar-Tani
|
Universality aspects of quantum corrections to transverse momentum
broadening in QCD media
|
57 pages, 15 figures
| null |
10.1007/JHEP09(2022)023
| null |
hep-ph cond-mat.stat-mech nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study non-linear quantum corrections to transverse momentum broadening
(TMB) of a fast parton propagating in dense QCD matter in the leading
logarithmic approximation. These non-local corrections yield an anomalous
super-diffusive behavior characterized by a heavy tailed distribution which is
associated with L\'{e}vy random walks. Using a formal analogy with the physics
of traveling waves, we show that at late times the transverse momentum
distribution tends to a universal scaling regime. We derive analytic solutions
in terms of an asymptotic expansion around the scaling limit for both fixed and
running coupling. We note that our analytic approach yields a good agreement
with the exact numerical solutions down to realistic values of medium length.
Finally, we discuss the interplay between system size and energy dependence of
the diffusion coefficient $\hat q$ and its connection with the gluon
distribution function that is manifest at large transverse momentum transfer.
|
[
{
"created": "Thu, 17 Mar 2022 16:00:44 GMT",
"version": "v1"
}
] |
2022-09-21
|
[
[
"Caucal",
"Paul",
""
],
[
"Mehtar-Tani",
"Yacine",
""
]
] |
We study non-linear quantum corrections to transverse momentum broadening (TMB) of a fast parton propagating in dense QCD matter in the leading logarithmic approximation. These non-local corrections yield an anomalous super-diffusive behavior characterized by a heavy tailed distribution which is associated with L\'{e}vy random walks. Using a formal analogy with the physics of traveling waves, we show that at late times the transverse momentum distribution tends to a universal scaling regime. We derive analytic solutions in terms of an asymptotic expansion around the scaling limit for both fixed and running coupling. We note that our analytic approach yields a good agreement with the exact numerical solutions down to realistic values of medium length. Finally, we discuss the interplay between system size and energy dependence of the diffusion coefficient $\hat q$ and its connection with the gluon distribution function that is manifest at large transverse momentum transfer.
|
hep-ph/0602087
|
Wayne W. Repko
|
Ali Abbasabadi and Wayne W. Repko
|
Higgs boson decay into Z bosons and a photon
|
4 pages, 5 figures, RevTeX, figures corrected
|
JHEP 0608 (2006) 048
|
10.1088/1126-6708/2006/08/048
| null |
hep-ph
| null |
We have performed a one-loop calculation of the width of the rare decay H ->
Z Z \gamma in the standard model for Higgs boson masses 190 GeV \leq m_H \leq
250 GeV. We find that the most dominant helicity combinations for the Z bosons
and the photon is when one of the Z bosons is longitudinally polarized and the
other Z boson and the photon have the same helicity. A comparison of the decay
width \Gamma(H->Z Z \gamma) to those of H->\gamma \gamma and H->\gamma Z shows
that the ratios of the decay widths are \Gamma(H->Z Z \gamma) /
\Gamma(H->\gamma\gamma) ~ \Gamma(H->Z Z \gamma) / \Gamma(H->\gamma Z) ~
10^{-7}.
|
[
{
"created": "Thu, 9 Feb 2006 21:19:40 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2006 16:11:34 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Abbasabadi",
"Ali",
""
],
[
"Repko",
"Wayne W.",
""
]
] |
We have performed a one-loop calculation of the width of the rare decay H -> Z Z \gamma in the standard model for Higgs boson masses 190 GeV \leq m_H \leq 250 GeV. We find that the most dominant helicity combinations for the Z bosons and the photon is when one of the Z bosons is longitudinally polarized and the other Z boson and the photon have the same helicity. A comparison of the decay width \Gamma(H->Z Z \gamma) to those of H->\gamma \gamma and H->\gamma Z shows that the ratios of the decay widths are \Gamma(H->Z Z \gamma) / \Gamma(H->\gamma\gamma) ~ \Gamma(H->Z Z \gamma) / \Gamma(H->\gamma Z) ~ 10^{-7}.
|
1808.05514
|
Alexander Kaloshin
|
A.E. Kaloshin and D.M.Voronin
|
Neutrino propagation in media and axis of complete polarization
|
16 pages, journal version
| null |
10.1140/epjc/s10052-019-6659-x
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct a spectral representation of neutrino propagator in moving
matter or in external magnetic field. In both cases there exists fixed
four-dimensional axis of polarization, such that the corresponding spin
projectors commute with propagator. As a result, all eigenvalues of propagator
and, consequently, dispersion laws for neutrino in media are classified
according to spin projection onto this axis. Use of the found spin projectors
simplifies essentially the eigenvalue problem and allows to build spectral
representation of propagator in moving matter or external magnetic field in
analogy with the vacuum propagator.
|
[
{
"created": "Thu, 16 Aug 2018 14:31:38 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Mar 2019 14:40:35 GMT",
"version": "v2"
}
] |
2019-03-27
|
[
[
"Kaloshin",
"A. E.",
""
],
[
"Voronin",
"D. M.",
""
]
] |
We construct a spectral representation of neutrino propagator in moving matter or in external magnetic field. In both cases there exists fixed four-dimensional axis of polarization, such that the corresponding spin projectors commute with propagator. As a result, all eigenvalues of propagator and, consequently, dispersion laws for neutrino in media are classified according to spin projection onto this axis. Use of the found spin projectors simplifies essentially the eigenvalue problem and allows to build spectral representation of propagator in moving matter or external magnetic field in analogy with the vacuum propagator.
|
hep-ph/9612478
|
Big Bad Bob
|
Qaisar Shafi and Robert K. Schaefer, (Bartol Research Institute,
University of Delaware)
|
The Cold Plus Hot Dark Matter Model From Supersymmetric Inflation
|
13 pages LaTEX, with two postscript figures. To appear in the
Proceedings of the Dark Matter '96 meeting in Heldelberg, Germany
| null | null | null |
hep-ph astro-ph
| null |
The cold plus hot dark matter (CHDM) model is arguably the best theory we
currently have for a consistent description of the observed large scale
structure formation. This is especially true if the primordial density
fluctuations are assumed to be essentially scale invariant, in which case a
mixture with 20-25 % HDM, 5- 10 % baryons, and the rest in CDM correctly
predicted (in 1989) the quadrupole anisotropy measured a few years later by the
COBE satellite. After a brief historical introduction, we present a model of
supersymmetric inflation in which the CHDM model is neatly realized with a
spectral index n= 0.98, while the dark matter consists of a few eV `tau'
neutrino and the LSP (essentially the `bino'). We also provide a comparison of
this model against the observations.
|
[
{
"created": "Fri, 27 Dec 1996 20:53:05 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Shafi",
"Qaisar",
""
],
[
"Schaefer",
"Robert K.",
""
]
] |
The cold plus hot dark matter (CHDM) model is arguably the best theory we currently have for a consistent description of the observed large scale structure formation. This is especially true if the primordial density fluctuations are assumed to be essentially scale invariant, in which case a mixture with 20-25 % HDM, 5- 10 % baryons, and the rest in CDM correctly predicted (in 1989) the quadrupole anisotropy measured a few years later by the COBE satellite. After a brief historical introduction, we present a model of supersymmetric inflation in which the CHDM model is neatly realized with a spectral index n= 0.98, while the dark matter consists of a few eV `tau' neutrino and the LSP (essentially the `bino'). We also provide a comparison of this model against the observations.
|
hep-ph/0011109
|
Antonio D. Polosa
|
N.A. Tornqvist and A.D. Polosa
|
How can one understand the lightest scalars, especially the sigma
|
9 pages; Invited plenary talk by N.A. Tornqvist at the ''Biennial
Conference on Low Energy Antiproton Physics'' (LEAP2000), Venice, Italy,
August 20-26, 2000. To appear in Nucl. Phys. A (proc. suppl.)
|
Nucl.Phys. A692 (2001) 259-267
|
10.1016/S0375-9474(01)01185-X
|
HIP-2000-60/TH
|
hep-ph
| null |
We discuss how the a_0(980), f_0(980), K^*_0(1430) and particularly the broad
sigma resonance can be understood within a coupled channel framework, which
includes all light two-pseudoscalar thresholds together with constraints from
Adler zeroes, flavour symmetric couplings, unitarity and physically acceptable
analyticity. All (qbar q) scalars are, when unitarized, strongly distorted by
hadronic mass shifts, and the nonstrange isoscalar state becomes a very broad
resonance, with its pole at 470-i250 MeV. We believe this is the sigma meson
required by models for spontaneous breaking of chiral symmetry. Recently this
light resonance has clearly been observed in D-> sigma pi-> 3pi by the E791
experiment at Fermilab, and we discuss how this decay channel can be predicted
in a Constituent Quark Meson Model (CQM), which incorporates heavy quark and
chiral symmetries. We also discuss the less well known phenomenon that with a
large coupling there can appear two physical resonance poles on the second
sheet although only one bare quark-antiquark state is put in. The f_0(980) and
f_0(1370) resonance poles can thus be two manifestations of the same (sbar s)
quark state. Both of these states are seen clearly in D_s-> 3pi by the E791
experiment, where (sbar s) intermediate states are expected to be dominant.
|
[
{
"created": "Wed, 8 Nov 2000 13:12:13 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Tornqvist",
"N. A.",
""
],
[
"Polosa",
"A. D.",
""
]
] |
We discuss how the a_0(980), f_0(980), K^*_0(1430) and particularly the broad sigma resonance can be understood within a coupled channel framework, which includes all light two-pseudoscalar thresholds together with constraints from Adler zeroes, flavour symmetric couplings, unitarity and physically acceptable analyticity. All (qbar q) scalars are, when unitarized, strongly distorted by hadronic mass shifts, and the nonstrange isoscalar state becomes a very broad resonance, with its pole at 470-i250 MeV. We believe this is the sigma meson required by models for spontaneous breaking of chiral symmetry. Recently this light resonance has clearly been observed in D-> sigma pi-> 3pi by the E791 experiment at Fermilab, and we discuss how this decay channel can be predicted in a Constituent Quark Meson Model (CQM), which incorporates heavy quark and chiral symmetries. We also discuss the less well known phenomenon that with a large coupling there can appear two physical resonance poles on the second sheet although only one bare quark-antiquark state is put in. The f_0(980) and f_0(1370) resonance poles can thus be two manifestations of the same (sbar s) quark state. Both of these states are seen clearly in D_s-> 3pi by the E791 experiment, where (sbar s) intermediate states are expected to be dominant.
|
hep-ph/9211295
|
Andreas Wirzba
|
A. Wirzba
|
Nuclear Matter Aspects of Skyrmions
|
20 pages, LaTeX, TH Darmstadt: IKDA 92/37
| null | null | null |
hep-ph nucl-th
| null |
As an alternative approach to the infinite-array description of dense matter
in the Skyrme model, we report about the properties of a single skyrmion on a
compact 3-sphere of finite radius. The density of this matter can be increased
by decreasing the hypersphere radius. As in the array calculations one
encounters a transition to a distinct high density phase characterized by a
delocalization in energy and baryon charge and by increased symmetries. We will
argue that the high density phase has to be interpreted as chirally restored
one. The arguments are based on the formation of complete chiral multiplets and
the vanishing of the pionic massless Goldstone modes in the high-density
fluctuation spectrum. We show that the restoration of chiral symmetry is common
to any chirally invariant extension of the usual Skyrme model - whether via
higher-order contact terms or via the introduction of stabilizing vector mesons
which act over a finite range. (Talk at the workshop on ``Baryons as Skyrme
Solitons'', Siegen, Germany, Sept. 27-30, 1992)
|
[
{
"created": "Mon, 23 Nov 1992 15:10:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Wirzba",
"A.",
""
]
] |
As an alternative approach to the infinite-array description of dense matter in the Skyrme model, we report about the properties of a single skyrmion on a compact 3-sphere of finite radius. The density of this matter can be increased by decreasing the hypersphere radius. As in the array calculations one encounters a transition to a distinct high density phase characterized by a delocalization in energy and baryon charge and by increased symmetries. We will argue that the high density phase has to be interpreted as chirally restored one. The arguments are based on the formation of complete chiral multiplets and the vanishing of the pionic massless Goldstone modes in the high-density fluctuation spectrum. We show that the restoration of chiral symmetry is common to any chirally invariant extension of the usual Skyrme model - whether via higher-order contact terms or via the introduction of stabilizing vector mesons which act over a finite range. (Talk at the workshop on ``Baryons as Skyrme Solitons'', Siegen, Germany, Sept. 27-30, 1992)
|
1006.2171
|
Dilip Kumar Ghosh
|
Debajyoti Choudhury and Dilip Kumar Ghosh
|
A fourth generation, anomalous like-sign dimuon charge asymmetry and the
LHC
|
18 pages, 9 figures, Figure 1 is modified, more discussions are added
in section 2. new references added
|
JHEP 1102:033,2011
|
10.1007/JHEP02(2011)033
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A fourth chiral generation, with $m_{t^\prime}$ in the range $\sim (300 -
500)$ GeV and a moderate value of the CP-violating phase can explain the
anomalous like-sign dimuon charge asymmetry observed recently by the D0
collaboration. The required parameters are found to be consistent with
constraints from other $B$ and $K$ decays. The presence of such quarks, apart
from being detectable in the early stages of the LHC, would also have important
consequences in the electroweak symmetry breaking sector.
|
[
{
"created": "Thu, 10 Jun 2010 23:27:20 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2010 09:28:46 GMT",
"version": "v2"
}
] |
2011-02-18
|
[
[
"Choudhury",
"Debajyoti",
""
],
[
"Ghosh",
"Dilip Kumar",
""
]
] |
A fourth chiral generation, with $m_{t^\prime}$ in the range $\sim (300 - 500)$ GeV and a moderate value of the CP-violating phase can explain the anomalous like-sign dimuon charge asymmetry observed recently by the D0 collaboration. The required parameters are found to be consistent with constraints from other $B$ and $K$ decays. The presence of such quarks, apart from being detectable in the early stages of the LHC, would also have important consequences in the electroweak symmetry breaking sector.
|
2009.12220
|
Roman Gerasimov
|
V.S. Fadin, R.E. Gerasimov
|
Parton distributions in radiative corrections to the cross section of
electron-proton scattering
|
arXiv admin note: text overlap with arXiv:1812.10710
| null | null |
Budker INP 2020-10
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The structure function approach and the parton picture, developed for the
theoretical description of the deep inelastic electron-proton scattering, also
proved to be very effective for calculation of radiative corrections in Quantum
Electrodynamics. We use them to calculate radiative corrections to the cross
section of electron-proton scattering due to electron-photon interaction, in
the experimental setup with the recoil proton detection, proposed by A.A.
Vorobev to measure the proton radius. In the one-loop approximation, explicit
expressions for these corrections are obtained for arbitrary momentum
transfers. It is shown that, at momentum transfers small compared with the
proton mass, various contributions to the corrections mutually cancel each
other with power accuracy. In two loops, the corrections are obtained in the
leading logarithmic approximation.
|
[
{
"created": "Thu, 24 Sep 2020 07:54:12 GMT",
"version": "v1"
}
] |
2020-09-28
|
[
[
"Fadin",
"V. S.",
""
],
[
"Gerasimov",
"R. E.",
""
]
] |
The structure function approach and the parton picture, developed for the theoretical description of the deep inelastic electron-proton scattering, also proved to be very effective for calculation of radiative corrections in Quantum Electrodynamics. We use them to calculate radiative corrections to the cross section of electron-proton scattering due to electron-photon interaction, in the experimental setup with the recoil proton detection, proposed by A.A. Vorobev to measure the proton radius. In the one-loop approximation, explicit expressions for these corrections are obtained for arbitrary momentum transfers. It is shown that, at momentum transfers small compared with the proton mass, various contributions to the corrections mutually cancel each other with power accuracy. In two loops, the corrections are obtained in the leading logarithmic approximation.
|
hep-ph/0509345
|
Shahin Agaev
|
S. S. Agaev (IPP, Baku State Univ.)
|
Higher twist distribution amplitudes of the pion and electromagnetic
form factor $F_{\pi}(Q^2)$
|
13 pages, 7 figures; the version to appear in Phys.Rev. D
|
Phys.Rev. D72 (2005) 074020
|
10.1103/PhysRevD.72.074020
| null |
hep-ph
| null |
The pion electromagnetic form factor is calculated within the QCD light-cone
sum rule method and using a renormalon model for the higher twist distribution
amplitudes (DAs). The theoretical predictions are compared with the
experimental data and constraints on the pion leading and twist-4 DAs are
extracted. An upper bound on the twist-4 contribution to the form factor and
estimates of effects due to higher conformal spins in the pion twist-4 DAs are
obtained.
|
[
{
"created": "Thu, 29 Sep 2005 12:54:37 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2005 08:34:10 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Agaev",
"S. S.",
"",
"IPP, Baku State Univ."
]
] |
The pion electromagnetic form factor is calculated within the QCD light-cone sum rule method and using a renormalon model for the higher twist distribution amplitudes (DAs). The theoretical predictions are compared with the experimental data and constraints on the pion leading and twist-4 DAs are extracted. An upper bound on the twist-4 contribution to the form factor and estimates of effects due to higher conformal spins in the pion twist-4 DAs are obtained.
|
hep-ph/0610051
|
Manuel Pincetti
|
M. Pincetti, B. Pasquini, S. Boffi (Pavia U. and INFN, Pavia)
|
Chiral-Odd Generalized Parton Distributions and Transversity in
Light-Front Constituent Quark Models
|
8 pages, 3 figures. Invited talk at the "Advanced Studies Institute
on SYMMETRIES AND SPIN" (SPIN-Praha-2006), 19-26 July, 2006, Prague. To be
pubblished in Czechoslovak Journal of Physics. Some references added
|
Czech.J.Phys.56:F229-F236,2006
| null | null |
hep-ph
| null |
We present the general framework to calculate chiral-odd generalized parton
distributions in the overlap representation using the Fock-state decomposition
in the transverse spin basis. In the forward limit we derive the transversity
distribution, the tensor charge and the angular momentum sum rule for quarks
with transverse polarization in an unpolarized nucleon. Numerical results are
obtained by applying the formalism to the case of light-cone wavefunctions of
constituent quark models.
|
[
{
"created": "Wed, 4 Oct 2006 15:31:49 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2006 09:21:40 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Pincetti",
"M.",
"",
"Pavia U. and INFN, Pavia"
],
[
"Pasquini",
"B.",
"",
"Pavia U. and INFN, Pavia"
],
[
"Boffi",
"S.",
"",
"Pavia U. and INFN, Pavia"
]
] |
We present the general framework to calculate chiral-odd generalized parton distributions in the overlap representation using the Fock-state decomposition in the transverse spin basis. In the forward limit we derive the transversity distribution, the tensor charge and the angular momentum sum rule for quarks with transverse polarization in an unpolarized nucleon. Numerical results are obtained by applying the formalism to the case of light-cone wavefunctions of constituent quark models.
|
hep-ph/9504389
|
Serguei Khlebnikov
|
S.Yu. Khlebnikov and R.G. Schnathorst
|
Strong-coupling expansions for chiral models of electroweak symmetry
breaking
|
11 pages, latex, no figures
|
Phys.Lett. B358 (1995) 81-86
|
10.1016/0370-2693(95)00993-U
|
PURD-TH-95-01
|
hep-ph
| null |
We consider chiral $U(N)\times U(N)$ models with fermions in the limit of
infinitely large local bare Yukawa coupling. When the scalar field is subject
to non-linear constraint, phase transitions in these models are seen to be
identical to those in the corresponding purely bosonic ones. Relaxing the
non-linear constraint, we compute the seventh-order strong-coupling series for
the susceptibility in these models and analyze them numerically for the
$U(2)\times U(2)$ case. We find that in four dimensions the approach to the
phase transition follows to a good accuracy the mean-field critical behavior,
indicating the absence of non-trivial fixed points at strong coupling and being
consistent with the first-order nature of the transition. In three dimensions,
the strongly-coupled bosonic $U(2)\times U(2)$ model (without gauge fields) has
a first-order transition strong enough to accommodate electroweak baryogenesis
only for a narrow region of the bare parameter space.
|
[
{
"created": "Tue, 25 Apr 1995 01:56:24 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Khlebnikov",
"S. Yu.",
""
],
[
"Schnathorst",
"R. G.",
""
]
] |
We consider chiral $U(N)\times U(N)$ models with fermions in the limit of infinitely large local bare Yukawa coupling. When the scalar field is subject to non-linear constraint, phase transitions in these models are seen to be identical to those in the corresponding purely bosonic ones. Relaxing the non-linear constraint, we compute the seventh-order strong-coupling series for the susceptibility in these models and analyze them numerically for the $U(2)\times U(2)$ case. We find that in four dimensions the approach to the phase transition follows to a good accuracy the mean-field critical behavior, indicating the absence of non-trivial fixed points at strong coupling and being consistent with the first-order nature of the transition. In three dimensions, the strongly-coupled bosonic $U(2)\times U(2)$ model (without gauge fields) has a first-order transition strong enough to accommodate electroweak baryogenesis only for a narrow region of the bare parameter space.
|
hep-ph/0112231
|
Gudrun Heinrich
|
M. Fontannaz, J.Ph. Guillet, G. Heinrich
|
A NLO calculation of the large p_T photon + photon -> photon + jet cross
section
|
23 pages LaTex, 11 figures
|
Eur.Phys.J.C23:503-511,2002
|
10.1007/s100520200907
|
LAPTH-887/01, LPT-Orsay 01-105, IPPP/01/68, DCPT/01/136
|
hep-ph
| null |
We study the production of an isolated large p_T photon as well as the
production of an isolated prompt photon plus a jet in e^+e^- collisions. Our
results are obtained by a NLO Monte Carlo program of partonic event generator
type. We discuss the possibilities to constrain the parton densities in the
real photon and compare to preliminary OPAL data.
|
[
{
"created": "Mon, 17 Dec 2001 19:50:38 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Fontannaz",
"M.",
""
],
[
"Guillet",
"J. Ph.",
""
],
[
"Heinrich",
"G.",
""
]
] |
We study the production of an isolated large p_T photon as well as the production of an isolated prompt photon plus a jet in e^+e^- collisions. Our results are obtained by a NLO Monte Carlo program of partonic event generator type. We discuss the possibilities to constrain the parton densities in the real photon and compare to preliminary OPAL data.
|
hep-ph/0402157
|
Toshifumi Yamashita
|
Naoyuki Haba and Toshifumi Yamashita
|
Dynamical symmetry breaking in Gauge-Higgs unification of 5D ${\mathcal
N}=1$ SUSY theory
|
15 pages, 4 figures;disscutions on Higgs quartic couplings added
|
JHEP 0404:016,2004
|
10.1088/1126-6708/2004/04/016
|
KUNS-1895
|
hep-ph
| null |
We study the dynamical symmetry breaking in the gauge-Higgs unification of
the 5D ${\mathcal N}=1$ SUSY theory, compactified on an orbifold, $S^1/Z_2$.
This theory identifies Wilson line degrees of freedoms as ``Higgs doublets''.
We consider $SU(3)_c \times SU(3)_W$ and SU(6) models, in which the gauge
symmetries are reduced to $SU(3)_c \times SU(2)_L \times U(1)_Y$ and $SU(3)_c
\times SU(2)_L \times U(1)_Y \times U(1)$, respectively, through the
orbifolding boundary conditions. Quarks and leptons are bulk fields, so that
Yukawa interactions can be derived from the 5D gauge interactions. We estimate
the one loop effective potential of ``Higgs doublets'', and analyze the vacuum
structures in these two models. We find that the effects of bulk quarks and
leptons destabilize the suitable electro-weak vacuum. We show that the
introduction of suitable numbers of extra bulk fields possessing the suitable
representations can realize the appropriate electro-weak symmetry breaking.
|
[
{
"created": "Sun, 15 Feb 2004 08:31:48 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Mar 2004 14:10:24 GMT",
"version": "v2"
}
] |
2010-11-19
|
[
[
"Haba",
"Naoyuki",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] |
We study the dynamical symmetry breaking in the gauge-Higgs unification of the 5D ${\mathcal N}=1$ SUSY theory, compactified on an orbifold, $S^1/Z_2$. This theory identifies Wilson line degrees of freedoms as ``Higgs doublets''. We consider $SU(3)_c \times SU(3)_W$ and SU(6) models, in which the gauge symmetries are reduced to $SU(3)_c \times SU(2)_L \times U(1)_Y$ and $SU(3)_c \times SU(2)_L \times U(1)_Y \times U(1)$, respectively, through the orbifolding boundary conditions. Quarks and leptons are bulk fields, so that Yukawa interactions can be derived from the 5D gauge interactions. We estimate the one loop effective potential of ``Higgs doublets'', and analyze the vacuum structures in these two models. We find that the effects of bulk quarks and leptons destabilize the suitable electro-weak vacuum. We show that the introduction of suitable numbers of extra bulk fields possessing the suitable representations can realize the appropriate electro-weak symmetry breaking.
|
1210.2603
|
Rathin Adhikari
|
Zini Rahman, Arnab Dasgupta, Rathin Adhikari
|
Non-standard interaction effect on $CP$ violation in neutrino
oscillation with super-beam
|
21 pages, 8 figures(39 eps files), text, figures modified
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have studied the $CP$ violation discovery reach in neutrino oscillation
experiment with superbeam in presence of non-standard interactions of neutrinos
with matter for both short and long baselines. For the most important channel
of oscillation ($\nu_\mu \rightarrow \nu_e$) for $CP$ violation discovery there
is significant effect in the oscillation probability particularly due to NSIs'
$\varepsilon_{e\mu}$ and $\varepsilon_{e\tau}$ for longer baseline and higher
energy in comparison to other NSIs'. Interestingly for these two NSIs' (for
real and higher allowed values) there is possibility of better discovery reach
of $CP$ violation than that with only Standard Model interactions of neutrinos
with matter provided that NSI values are known. For complex NSIs' we have shown
the $CP$ violation discovery reach in the plane of Dirac phase $\delta$ and NSI
phase $\phi_{ij}$. Our analysis indicates that for some values of some NSI
phases total $CP$ violation may not be observable for any values of $\delta $.
|
[
{
"created": "Tue, 9 Oct 2012 14:08:18 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jan 2013 12:00:11 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Apr 2014 11:57:02 GMT",
"version": "v3"
}
] |
2014-04-22
|
[
[
"Rahman",
"Zini",
""
],
[
"Dasgupta",
"Arnab",
""
],
[
"Adhikari",
"Rathin",
""
]
] |
We have studied the $CP$ violation discovery reach in neutrino oscillation experiment with superbeam in presence of non-standard interactions of neutrinos with matter for both short and long baselines. For the most important channel of oscillation ($\nu_\mu \rightarrow \nu_e$) for $CP$ violation discovery there is significant effect in the oscillation probability particularly due to NSIs' $\varepsilon_{e\mu}$ and $\varepsilon_{e\tau}$ for longer baseline and higher energy in comparison to other NSIs'. Interestingly for these two NSIs' (for real and higher allowed values) there is possibility of better discovery reach of $CP$ violation than that with only Standard Model interactions of neutrinos with matter provided that NSI values are known. For complex NSIs' we have shown the $CP$ violation discovery reach in the plane of Dirac phase $\delta$ and NSI phase $\phi_{ij}$. Our analysis indicates that for some values of some NSI phases total $CP$ violation may not be observable for any values of $\delta $.
|
hep-ph/9703229
|
Pedro Bicudo
|
P. Bicudo (Centro de Fisica das Interacoes fundamentais, Instituto
Superior Tecnico, Lisboa)
|
Spontaneous Chiral Symmetry Breaking Beyond BCS
|
4 pages in latex revtex, 0 Postscript figures
| null | null |
FISIST/5-97/CFIF
|
hep-ph
| null |
At the BCS level of chiral symmetry breaking, the mass gap equation for
quark-antiquark condensation only uses the kernel of the Bethe-Salpeter
equation. We introduce coupled channels with ladder mesons in the mass gap
equation. Consistency is insured by the Ward Identity for axial currents, and
the $\pi$ remains a Goldstone boson in the chiral limit. We find that bare
mesons with confined quarks do not contribute to the mass gap equation, and
estimate that the contribution of full mesons may be large.
|
[
{
"created": "Tue, 4 Mar 1997 14:23:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bicudo",
"P.",
"",
"Centro de Fisica das Interacoes fundamentais, Instituto\n Superior Tecnico, Lisboa"
]
] |
At the BCS level of chiral symmetry breaking, the mass gap equation for quark-antiquark condensation only uses the kernel of the Bethe-Salpeter equation. We introduce coupled channels with ladder mesons in the mass gap equation. Consistency is insured by the Ward Identity for axial currents, and the $\pi$ remains a Goldstone boson in the chiral limit. We find that bare mesons with confined quarks do not contribute to the mass gap equation, and estimate that the contribution of full mesons may be large.
|
1512.02091
|
Florian Domingo
|
Florian Domingo (IFCA / IFT)
|
Update of the flavour-physics constraints in the NMSSM
|
22 pages, 7 figures
| null |
10.1140/epjc/s10052-016-4298-z
|
IFT-UAM/CSIC-15-130
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the impact of several flavour-changing observables in the $B$-
and the Kaon sectors on the parameter space of the NMSSM, in a minimal flavour
violating version of this model. Our purpose consists in updating our previous
results in arXiv:0710.3714 and designing an up-to-date flavour test for the
public package NMSSMTools. We provide details concerning our implementation of
the constraints in a series of brief reviews of the current status of the
considered channels. Finally, we present a few consequences of these flavour
constraints for the NMSSM, turning to two specific scenarios: one is
characteristic of the MSSM-limit and illustrates the workings of charged-Higgs
and genuinely supersymmetric contributions to flavour-changing processes; the
second focus is a region where a light CP-odd Higgs is present. Strong limits
are found whenever an enhancement factor - large $\tan\beta$, light $H^{\pm}$,
resonant pseudoscalar - comes into play.
|
[
{
"created": "Mon, 7 Dec 2015 15:34:21 GMT",
"version": "v1"
}
] |
2016-09-21
|
[
[
"Domingo",
"Florian",
"",
"IFCA / IFT"
]
] |
We consider the impact of several flavour-changing observables in the $B$- and the Kaon sectors on the parameter space of the NMSSM, in a minimal flavour violating version of this model. Our purpose consists in updating our previous results in arXiv:0710.3714 and designing an up-to-date flavour test for the public package NMSSMTools. We provide details concerning our implementation of the constraints in a series of brief reviews of the current status of the considered channels. Finally, we present a few consequences of these flavour constraints for the NMSSM, turning to two specific scenarios: one is characteristic of the MSSM-limit and illustrates the workings of charged-Higgs and genuinely supersymmetric contributions to flavour-changing processes; the second focus is a region where a light CP-odd Higgs is present. Strong limits are found whenever an enhancement factor - large $\tan\beta$, light $H^{\pm}$, resonant pseudoscalar - comes into play.
|
hep-ph/9907506
|
Masahide Yamaguchi
|
Masahide Yamaguchi
|
Scaling Property of the global string in the radiation dominated
universe
|
18 pages, 9 figures, to appear in Phys. Rev. D
|
Phys.Rev. D60 (1999) 103511
|
10.1103/PhysRevD.60.103511
| null |
hep-ph astro-ph
| null |
We investigate the evolution of the global string network in the radiation
dominated universe by use of numerical simulations in 3+1 dimensions. We find
that the global string network settles down to the scaling regime where the
energy density of global strings, $\rho_{s}$, is given by $\rho_{s} = \xi \mu /
t^2$ with $\mu$ the string tension per unit length and the scaling parameter,
$\xi \sim (0.9-1.3)$, irrespective of the cosmic time. We also find that the
loop distribution function can be fitted with that predicted by the so-called
one scale model. Concretely, the number density, $n_{l}(t)$, of the loop with
the length, $l$, is given by $n_{l}(t) = \nu/[t^{3/2} (l + \kappa t)^{5/2}]$
where $\nu \sim 0.0865$ and $\kappa$ is related with the Nambu-Goldstone(NG)
boson radiation power from global strings, $P$, as $P = \kappa \mu$ with
$\kappa \sim 0.535$. Therefore, the loop production function also scales and
the typical scale of produced loops is nearly the horizon distance. Thus, the
evolution of the global string network in the radiation dominated universe can
be well described by the one scale model in contrast with that of the local
string network.
|
[
{
"created": "Tue, 27 Jul 1999 01:41:04 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Yamaguchi",
"Masahide",
""
]
] |
We investigate the evolution of the global string network in the radiation dominated universe by use of numerical simulations in 3+1 dimensions. We find that the global string network settles down to the scaling regime where the energy density of global strings, $\rho_{s}$, is given by $\rho_{s} = \xi \mu / t^2$ with $\mu$ the string tension per unit length and the scaling parameter, $\xi \sim (0.9-1.3)$, irrespective of the cosmic time. We also find that the loop distribution function can be fitted with that predicted by the so-called one scale model. Concretely, the number density, $n_{l}(t)$, of the loop with the length, $l$, is given by $n_{l}(t) = \nu/[t^{3/2} (l + \kappa t)^{5/2}]$ where $\nu \sim 0.0865$ and $\kappa$ is related with the Nambu-Goldstone(NG) boson radiation power from global strings, $P$, as $P = \kappa \mu$ with $\kappa \sim 0.535$. Therefore, the loop production function also scales and the typical scale of produced loops is nearly the horizon distance. Thus, the evolution of the global string network in the radiation dominated universe can be well described by the one scale model in contrast with that of the local string network.
|
hep-ph/0702203
|
Vladimir Zykunov
|
Vladimir A. Zykunov
|
Electroweak corrections to the Drell-Yan process in the high dimuon mass
range
|
Changed content; 11 pp, 5 fig
| null | null | null |
hep-ph
| null |
The complete electroweak radiative O(\alpha) corrections to the Drell-Yan
process at large invariant dimuon mass have been studied. All formulas for the
cross sections and kinematical restrictions are presented in explicit form, for
the simplification of calculation and coding the theta- and delta-functions are
actively used. The FORTRAN code READY for the numerical analysis in the high
energy region corresponding to the future experiments at the CERN Large Hadron
Collider has been constructed. To simulate the detector acceptance we used the
standard CMS detector cuts. The radiative corrections are found to become large
at high dimuon mass M, the complete corrections at "bare" setup change the
dimuon mass distribution up to ~ -5.6% (-23.2%; -35.3%) at the LHC energy and
M=1 (3; 5)TeV.
|
[
{
"created": "Tue, 20 Feb 2007 14:37:55 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2007 18:45:16 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Zykunov",
"Vladimir A.",
""
]
] |
The complete electroweak radiative O(\alpha) corrections to the Drell-Yan process at large invariant dimuon mass have been studied. All formulas for the cross sections and kinematical restrictions are presented in explicit form, for the simplification of calculation and coding the theta- and delta-functions are actively used. The FORTRAN code READY for the numerical analysis in the high energy region corresponding to the future experiments at the CERN Large Hadron Collider has been constructed. To simulate the detector acceptance we used the standard CMS detector cuts. The radiative corrections are found to become large at high dimuon mass M, the complete corrections at "bare" setup change the dimuon mass distribution up to ~ -5.6% (-23.2%; -35.3%) at the LHC energy and M=1 (3; 5)TeV.
|
hep-ph/0311058
|
Weizhen Deng
|
Weizhen Deng, Xiaolin Chen, Dahai Lu, ShiLin Zhu
|
$SU(3)_F$ Meson Mass Formula from Random Phase Approximation
| null |
Chin.Phys.Lett. 21 (2004) 624-625
|
10.1088/0256-307X/21/4/009
| null |
hep-ph
| null |
We present a $SU(3)_F$ meson mass formula from random phase approximation
(RPA). Both the mesons of ground-state pseudoscalar octet and the ground-state
vector octet are described quite well in this mass formula. We also estimate
the current and constituent quark masses from the na\"{\i}ve quark model with
the PCAC relation.
|
[
{
"created": "Wed, 5 Nov 2003 01:13:36 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2004 05:48:38 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Deng",
"Weizhen",
""
],
[
"Chen",
"Xiaolin",
""
],
[
"Lu",
"Dahai",
""
],
[
"Zhu",
"ShiLin",
""
]
] |
We present a $SU(3)_F$ meson mass formula from random phase approximation (RPA). Both the mesons of ground-state pseudoscalar octet and the ground-state vector octet are described quite well in this mass formula. We also estimate the current and constituent quark masses from the na\"{\i}ve quark model with the PCAC relation.
|
1502.06251
|
Edward Shuryak
|
Edward Shuryak
|
Gauge topology and confinement: an update
|
This is a writeup for proceedings of the 9th International Workshop
on Critical Point and Onset of Deconfinement - CPOD2014. A talk of similar
structure and content has also been given at The 32nd International Symposium
on Lattice Field Theory, Columbia University, New York, June 2014
| null | null | null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the instanton ensemble the fermionic zero modes collectivize and break
chiral symmetry. Recent studies of resulting zero mode zone confirm its very
small width and overall importance for lattice simulations.
Confinement however has been related with completely different topological
objects, the magnetic monopoles. Instanton constituents -- instanton dyons,
discovered at nonzero holonomy by Pierre van Baal and others -- are able to
explain both confinement and chiral symmetry breaking. The talk summarizes
recent works deriving the instanton-dyon mutual interactions, and statistical
studies of their ensemble. At high density the screening is robust enough to do
it analytically, in the mean-field-type approach: we call this limit Dense
Dyonic Plasma (DDP). Above $T_c$ the classical interaction between the dyons
induce strong correlations and should be studied by direct numerical
simulations. Those works are now in progress.
|
[
{
"created": "Sun, 22 Feb 2015 17:23:18 GMT",
"version": "v1"
}
] |
2015-02-24
|
[
[
"Shuryak",
"Edward",
""
]
] |
In the instanton ensemble the fermionic zero modes collectivize and break chiral symmetry. Recent studies of resulting zero mode zone confirm its very small width and overall importance for lattice simulations. Confinement however has been related with completely different topological objects, the magnetic monopoles. Instanton constituents -- instanton dyons, discovered at nonzero holonomy by Pierre van Baal and others -- are able to explain both confinement and chiral symmetry breaking. The talk summarizes recent works deriving the instanton-dyon mutual interactions, and statistical studies of their ensemble. At high density the screening is robust enough to do it analytically, in the mean-field-type approach: we call this limit Dense Dyonic Plasma (DDP). Above $T_c$ the classical interaction between the dyons induce strong correlations and should be studied by direct numerical simulations. Those works are now in progress.
|
hep-ph/0307255
|
Brent D. Nelson
|
Brent D. Nelson
|
Experimental Signatures of Kahler Stabilization of the Dilaton
|
Proceedings of talk given at "Supergravity at 20," Northeastern
University, March 17-21, 2003
| null | null |
MCTP 03-34
|
hep-ph
| null |
We investigate the collider signatures of modular invariant gaugino
condensation, with Kahler stabilization of the dilaton, in the context of
weakly coupled heterotic string-based models as an example of how supergravity
can be used to build a meaningful string phenomenology.
|
[
{
"created": "Sun, 20 Jul 2003 19:22:51 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nelson",
"Brent D.",
""
]
] |
We investigate the collider signatures of modular invariant gaugino condensation, with Kahler stabilization of the dilaton, in the context of weakly coupled heterotic string-based models as an example of how supergravity can be used to build a meaningful string phenomenology.
|
hep-ph/0007286
|
Kevin Lynch
|
Kevin R. Lynch, Meenakshi Narain, Elizabeth H. Simmons (Boston U.) and
Stephen Mrenna (UC, Davis)
|
Finding Z' bosons coupled preferentially to the third family at CERN LEP
and the Fermilab Tevatron
|
LaTeX2e, 24 pages (including title page), 13 figures; version 2:
corrected typographical errors and bad figure placement; version 3: added
references and updated introduction; version 4: changes to compensate for old
latex version on arXiv server; version 5: additional references, and embedded
fonts in eps files for PRD; version 6: corrected some minor typos to address
PRD referee's comments
|
Phys.Rev.D63:035006,2001
|
10.1103/PhysRevD.63.035006
|
BUHEP-00-4, UCD-2000-12
|
hep-ph hep-ex
| null |
Z' bosons that couple preferentially to the third generation fermions can
arise in models with extended weak (SU(2)xSU(2)) or hypercharge (U(1)xU(1))
gauge groups. We show that existing limits on quark-lepton compositeness set by
the LEP and Tevatron experiments translate into lower bounds of order a few
hundred GeV on the masses of these Z' bosons. Resonances of this mass can be
directly produced at the Tevatron. Accordingly, we explore in detail the limits
that can be set at Run II using the process p pbar -> Z' -> tau tau -> e mu. We
also comment on the possibility of using hadronically-decaying taus to improve
the limits.
|
[
{
"created": "Tue, 25 Jul 2000 21:57:16 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2000 00:05:47 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Aug 2000 19:19:42 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Aug 2000 20:15:45 GMT",
"version": "v4"
},
{
"created": "Wed, 18 Oct 2000 17:31:13 GMT",
"version": "v5"
}
] |
2011-03-23
|
[
[
"Lynch",
"Kevin R.",
"",
"Boston U."
],
[
"Narain",
"Meenakshi",
"",
"Boston U."
],
[
"Simmons",
"Elizabeth H.",
"",
"Boston U."
],
[
"Mrenna",
"Stephen",
"",
"UC, Davis"
]
] |
Z' bosons that couple preferentially to the third generation fermions can arise in models with extended weak (SU(2)xSU(2)) or hypercharge (U(1)xU(1)) gauge groups. We show that existing limits on quark-lepton compositeness set by the LEP and Tevatron experiments translate into lower bounds of order a few hundred GeV on the masses of these Z' bosons. Resonances of this mass can be directly produced at the Tevatron. Accordingly, we explore in detail the limits that can be set at Run II using the process p pbar -> Z' -> tau tau -> e mu. We also comment on the possibility of using hadronically-decaying taus to improve the limits.
|
hep-ph/9509355
|
Peter Cho
|
Peter Cho
|
Prompt Upsilon and Psi Production at LEP
|
15 pages, harvmac, 3 uuencoded figures
|
Phys.Lett. B368 (1996) 171-178
|
10.1016/0370-2693(95)01484-5
|
CALT-68-2020
|
hep-ph
| null |
Color-octet contributions to quarkonia production at LEP are studied herein.
The short distance formation of heavy quark-antiquark pairs in color-octet
configurations via gluon fragmentation processes is significantly enhanced
relative to the creation of color-singlet pairs via heavy quark fragmentation.
But the subsequent long distance hadronization of these colored pairs into
physical quarkonium bound states is suppressed compared to the nonperturbative
evolution of their colorless counterparts. We find that the overall LEP rates
for gluon fragmentation into prompt Upsilon and Psi vector bosons exceed those
from heavy quark fragmentation. Inclusion of the dominant color-octet
quarkonium production channel eliminates sizable discrepancies between previous
predictions and recent measurements of prompt $Z \to \Jpsi+X$, $Z \to \psi'+X$
and $Z \to \Upsilon+X$ branching fractions.
|
[
{
"created": "Fri, 22 Sep 1995 00:29:33 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Cho",
"Peter",
""
]
] |
Color-octet contributions to quarkonia production at LEP are studied herein. The short distance formation of heavy quark-antiquark pairs in color-octet configurations via gluon fragmentation processes is significantly enhanced relative to the creation of color-singlet pairs via heavy quark fragmentation. But the subsequent long distance hadronization of these colored pairs into physical quarkonium bound states is suppressed compared to the nonperturbative evolution of their colorless counterparts. We find that the overall LEP rates for gluon fragmentation into prompt Upsilon and Psi vector bosons exceed those from heavy quark fragmentation. Inclusion of the dominant color-octet quarkonium production channel eliminates sizable discrepancies between previous predictions and recent measurements of prompt $Z \to \Jpsi+X$, $Z \to \psi'+X$ and $Z \to \Upsilon+X$ branching fractions.
|
1910.08065
|
Hajime Fukuda
|
Hajime Fukuda, Natsumi Nagata, Hideyuki Oide, Hidetoshi Otono and
Satoshi Shirai
|
Cornering Higgsino: Use of Soft Displaced Track
|
6 pages, 2 figures
|
Phys. Rev. Lett. 124, 101801 (2020)
|
10.1103/PhysRevLett.124.101801
|
KYUSHU-RCAPP-2019-05, UT-19-24, IPMU19-0145
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Higgsino has been intensively searched for in the LHC experiments in recent
years. Currently, there is an uncharted region beyond the LEP Higgsino mass
limit where the mass splitting between the neutral and charged Higgsinos is
around $0.3$-$1$ GEV, which is unexplored by either the soft di-lepton or
disappearing track searches. This region is, however, of great importance from
a phenomenological point of view, as many supersymmetric models predict such a
mass spectrum. In this letter, we propose a possibility of filling this gap by
using a soft micro-displaced track on top of the mono-jet event selection,
which allows us to discriminate a signature of the charged Higgsino decay from
the Standard Model background. It is found that this new strategy is
potentially sensitive to a Higgsino mass of $\lesssim 180$ $(250)$ GeV at the
LHC Run 2 (HL-LHC) for a charged-neutral mass splitting of $\simeq 0.5$ GeV.
|
[
{
"created": "Thu, 17 Oct 2019 17:54:36 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2019 22:17:08 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Feb 2020 19:29:45 GMT",
"version": "v3"
}
] |
2020-03-18
|
[
[
"Fukuda",
"Hajime",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Oide",
"Hideyuki",
""
],
[
"Otono",
"Hidetoshi",
""
],
[
"Shirai",
"Satoshi",
""
]
] |
Higgsino has been intensively searched for in the LHC experiments in recent years. Currently, there is an uncharted region beyond the LEP Higgsino mass limit where the mass splitting between the neutral and charged Higgsinos is around $0.3$-$1$ GEV, which is unexplored by either the soft di-lepton or disappearing track searches. This region is, however, of great importance from a phenomenological point of view, as many supersymmetric models predict such a mass spectrum. In this letter, we propose a possibility of filling this gap by using a soft micro-displaced track on top of the mono-jet event selection, which allows us to discriminate a signature of the charged Higgsino decay from the Standard Model background. It is found that this new strategy is potentially sensitive to a Higgsino mass of $\lesssim 180$ $(250)$ GeV at the LHC Run 2 (HL-LHC) for a charged-neutral mass splitting of $\simeq 0.5$ GeV.
|
hep-ph/0608026
|
Stephen P. Martin
|
Stephen P. Martin
|
Refined gluino and squark pole masses beyond leading order
|
14 pages. v2: typos in equations (A.11), (A.17), and (A.18) fixed
|
Phys.Rev. D74 (2006) 075009
|
10.1103/PhysRevD.74.075009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The physical pole and running masses of squarks and gluinos have recently
been related at two-loop order in a mass-independent renormalization scheme. I
propose a general method for improvement of such formulas, and argue that
better accuracy results. The improved version gives an imaginary part of the
pole mass that agrees exactly with the direct calculation of the physical width
at next-to-leading order. I also find the leading three-loop contributions to
the gluino pole mass in the case that squarks are heavier, using effective
field theory and renormalization group methods. The efficacy of these
improvements for the gluino and squarks is illustrated with numerical examples.
Some necessary three-loop results for gauge coupling and fermion mass beta
functions and pole masses in theories with more than one type of fermion
representation, which are not directly accessible from the published
literature, are presented in an Appendix.
|
[
{
"created": "Wed, 2 Aug 2006 21:55:22 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2018 05:33:41 GMT",
"version": "v2"
}
] |
2018-12-12
|
[
[
"Martin",
"Stephen P.",
""
]
] |
The physical pole and running masses of squarks and gluinos have recently been related at two-loop order in a mass-independent renormalization scheme. I propose a general method for improvement of such formulas, and argue that better accuracy results. The improved version gives an imaginary part of the pole mass that agrees exactly with the direct calculation of the physical width at next-to-leading order. I also find the leading three-loop contributions to the gluino pole mass in the case that squarks are heavier, using effective field theory and renormalization group methods. The efficacy of these improvements for the gluino and squarks is illustrated with numerical examples. Some necessary three-loop results for gauge coupling and fermion mass beta functions and pole masses in theories with more than one type of fermion representation, which are not directly accessible from the published literature, are presented in an Appendix.
|
hep-ph/9703411
| null |
I. Schmidt and J. Soffer
|
Melosh Rotation and the Nucleon Tensor Charge
|
8 pages, Latex file, no ps figure
|
Phys.Lett.B407:331-334,1997
|
10.1016/S0370-2693(97)00737-5
|
CPT-97/P.3460
|
hep-ph
| null |
By making use of the effect of the Melosh rotation, we show that one can
estimate, in a simple way, the nucleon tensor charge in a relativistic quark
model formulated on the light-cone. We discuss the physical significance of our
results and compare them with those recently obtained in different
phenomenological models.
|
[
{
"created": "Tue, 25 Mar 1997 10:20:25 GMT",
"version": "v1"
}
] |
2010-11-19
|
[
[
"Schmidt",
"I.",
""
],
[
"Soffer",
"J.",
""
]
] |
By making use of the effect of the Melosh rotation, we show that one can estimate, in a simple way, the nucleon tensor charge in a relativistic quark model formulated on the light-cone. We discuss the physical significance of our results and compare them with those recently obtained in different phenomenological models.
|
2008.13442
|
Qing-Hong Cao
|
Qing-Hong Cao, Ke-Pan Xie, Hao Zhang, Rui Zhang
|
A New Observable for Measuring CP Property of Top-Higgs Interaction
| null | null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new dihedral angle observable to measure the CP property of the
interaction of top quark and Higgs boson in the $t\bar{t}H$ production at the
14~TeV LHC. We consider two decay modes of the Higgs boson, $H\to b\bar{b}$ and
$H\to \gamma\gamma$ and show that the dihedral angle distribution is able to
distinguish the CP-even and the CP-odd hypothesis at 95\% confidence level with
an integrated luminosity of $\sim 180~{\rm fb}^{-1}$.
|
[
{
"created": "Mon, 31 Aug 2020 09:04:20 GMT",
"version": "v1"
}
] |
2020-09-01
|
[
[
"Cao",
"Qing-Hong",
""
],
[
"Xie",
"Ke-Pan",
""
],
[
"Zhang",
"Hao",
""
],
[
"Zhang",
"Rui",
""
]
] |
We propose a new dihedral angle observable to measure the CP property of the interaction of top quark and Higgs boson in the $t\bar{t}H$ production at the 14~TeV LHC. We consider two decay modes of the Higgs boson, $H\to b\bar{b}$ and $H\to \gamma\gamma$ and show that the dihedral angle distribution is able to distinguish the CP-even and the CP-odd hypothesis at 95\% confidence level with an integrated luminosity of $\sim 180~{\rm fb}^{-1}$.
|
hep-ph/9406273
|
Arnd Leike
|
D. Bardin, A. Leike, T. Riemann
|
Semi-Analytical Approach to Higgs Production at LEP 2
|
6 latex pages; 3 figures, feinman.sty and nuclphys.sty included as
uuencoded file, CERN-TH.703/94, LMU 08/94
|
Nucl.Phys.Proc.Suppl.37B:274-278,1994
|
10.1016/0920-5632(94)90684-X
| null |
hep-ph
| null |
The cross-section for the reaction $e^+e^- \rightarrow b\bar{b}\mu^+\mu^-$ is
calculated with a semi-analytical integration of the phase space. Compact
formulae are obtained for the total cross section and for invariant mass
distributions of the $\mu^+\mu^-$ and $b\bar{b}$ pairs. The background diagrams
to $ZH$ production yield analytically cumbersome but numerically small
contributions. The numerical results are compared with those from a Monte Carlo
approach.
|
[
{
"created": "Fri, 10 Jun 1994 09:50:07 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Bardin",
"D.",
""
],
[
"Leike",
"A.",
""
],
[
"Riemann",
"T.",
""
]
] |
The cross-section for the reaction $e^+e^- \rightarrow b\bar{b}\mu^+\mu^-$ is calculated with a semi-analytical integration of the phase space. Compact formulae are obtained for the total cross section and for invariant mass distributions of the $\mu^+\mu^-$ and $b\bar{b}$ pairs. The background diagrams to $ZH$ production yield analytically cumbersome but numerically small contributions. The numerical results are compared with those from a Monte Carlo approach.
|
hep-ph/9702320
|
Christopher T. Hill
|
Christopher T. Hill (Fermilab)
|
``Topcolor''; Invited talk presented at "Strongly Coupled Gauge
Theories, 1996", Nagoya, Japan, Nov. 1996
|
19 pages, Latex. No Figures included. email: Hill@fnal.gov
| null | null |
FERMILAB-Conf-97/032-T
|
hep-ph
| null |
We review a class of dynamical models in which top condensation occurs at the
weak scale, giving rise to the large top quark mass and other phenomena. This
typically requires a color embedding, $SU(3)_c \rightarrow SU(3)_1\times
SU(3)_2$. These models imply many signatures addressable in near term
experiments at colliders and in fixed target mode.
|
[
{
"created": "Wed, 12 Feb 1997 21:27:59 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Hill",
"Christopher T.",
"",
"Fermilab"
]
] |
We review a class of dynamical models in which top condensation occurs at the weak scale, giving rise to the large top quark mass and other phenomena. This typically requires a color embedding, $SU(3)_c \rightarrow SU(3)_1\times SU(3)_2$. These models imply many signatures addressable in near term experiments at colliders and in fixed target mode.
|
hep-ph/9612215
|
Gestt Trentadue
|
N.P. Merenkov (PTI Kharkov)
|
Small angle Bhabha scattering at LEP1. Wide-narrow angular acceptance
|
33 pages, LaTeX, submitted to ZhETF
|
J.Exp.Theor.Phys. 85 (1997) 217-233; Zh.Eksp.Teor.Fiz. 112 (1997)
400-428
|
10.1134/1.558268
| null |
hep-ph
| null |
Analytical method is applied for description of the small angle Bhabha
scattering at LEP1. Inclusive event selection for asymmetrical wide-narrow
circular detectors is considered. The QED correction to the Born cross-section
is calculated with leading and next-to-leading accuracy in the second order of
perturbation theory and with leading one --- in the third order. All
contributions in the second order due to photonic radiative corrections and
pair production are calculated starting from essential Feynman diagrams. The
third order correction is computed by means of electron structure function.
Numerical results illustrate the analytical calculsations.
|
[
{
"created": "Sat, 30 Nov 1996 16:37:22 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Merenkov",
"N. P.",
"",
"PTI Kharkov"
]
] |
Analytical method is applied for description of the small angle Bhabha scattering at LEP1. Inclusive event selection for asymmetrical wide-narrow circular detectors is considered. The QED correction to the Born cross-section is calculated with leading and next-to-leading accuracy in the second order of perturbation theory and with leading one --- in the third order. All contributions in the second order due to photonic radiative corrections and pair production are calculated starting from essential Feynman diagrams. The third order correction is computed by means of electron structure function. Numerical results illustrate the analytical calculsations.
|
0903.0564
|
David Emmanuel-Costa
|
D. Emmanuel-Costa, C. Simoes
|
Reconstruction of Quark Mass Matrices with Weak Basis Texture Zeroes
from Experimental Input
|
RevTeX4, 3 tables, 21 pages; misprints corrected and one reference
added
| null |
10.1103/PhysRevD.79.073006
|
CFTP-IST/09-18
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
All quark mass matrices with texture zeroes obtained through weak basis
transformations are confronted with the experimental data. The reconstruction
of the quark mass matrices M_u and M_d at the electroweak scale is performed in
a weak basis where the matrices are Hermitian and have a maximum of three
vanishing elements. The same procedure is also accomplished for the Yukawa
coupling matrices at the grand unification scale in the context of the Standard
Model and its minimal supersymmetric extension as well as of the two Higgs
doublet model. The analysis of all viable power structures on the quark Yukawa
coupling matrices that could naturally appear from a Froggatt-Nielsen mechanism
is also presented.
|
[
{
"created": "Tue, 3 Mar 2009 20:16:04 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Mar 2009 16:23:21 GMT",
"version": "v2"
}
] |
2013-05-29
|
[
[
"Emmanuel-Costa",
"D.",
""
],
[
"Simoes",
"C.",
""
]
] |
All quark mass matrices with texture zeroes obtained through weak basis transformations are confronted with the experimental data. The reconstruction of the quark mass matrices M_u and M_d at the electroweak scale is performed in a weak basis where the matrices are Hermitian and have a maximum of three vanishing elements. The same procedure is also accomplished for the Yukawa coupling matrices at the grand unification scale in the context of the Standard Model and its minimal supersymmetric extension as well as of the two Higgs doublet model. The analysis of all viable power structures on the quark Yukawa coupling matrices that could naturally appear from a Froggatt-Nielsen mechanism is also presented.
|
2111.09994
|
Adolfo Guevara
|
Adolfo Guevara, Gabriel L\'opez Castro and Pablo Roig
|
Improved description of di-lepton production in $\tau^-\to\nu_\tau P^-$
decays
|
28 pages, 14 figures, 3 tables
|
Phys. Rev. D 105, 076007 (2022)
|
10.1103/PhysRevD.105.076007
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Recently, the Belle collaboration reported the first measurements of the
$\tau^- \to\nu_{\tau}\pi^-e^+e^-$ branching fraction and the spectrum of the
pion-dielectron system. In an analysis previous to Belle's results, we
evaluated this branching fraction which turned out to be compatible with that
reported by Belle, although with a large uncertainty. This is the motivation to
seek for improvements on our previous evaluation of $\tau^- \to
\nu_{\tau}\pi^-\ell^+\ell^-$ decays ($\ell=e,\,\mu$). In this paper we improve
our calculation of the $WP^-\gamma^*$ vertex by including flavour symmetry
breaking effects in the framework of the Resonance Chiral Theory. We impose QCD
short-distance behaviour to constrain most parameters and data on the
$\pi^-e^+e^-$ spectrum reported by Belle to fix the remaining free ones. As a
result, improved predictions for the branching ratios and hadronic/leptonic
spectra are reported, in good agreement with observations. Analogous
calculations for the strangeness-changing $\tau^- \to
\nu_{\tau}K^-\ell^+\ell^-$ transitions are reported for the first time. Albeit
one expects the $m_{\pi\mu^+\mu^-}$ spectrum to be measured in Belle-II and the
observables with $\ell=e$ can be improved, it is rather unlikely that the $K$
channels can be measured due to the suppression factor
$|V_{ud}/V_{us}|^2=0.05$.
|
[
{
"created": "Fri, 19 Nov 2021 01:12:13 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2022 15:49:44 GMT",
"version": "v2"
}
] |
2022-04-14
|
[
[
"Guevara",
"Adolfo",
""
],
[
"Castro",
"Gabriel López",
""
],
[
"Roig",
"Pablo",
""
]
] |
Recently, the Belle collaboration reported the first measurements of the $\tau^- \to\nu_{\tau}\pi^-e^+e^-$ branching fraction and the spectrum of the pion-dielectron system. In an analysis previous to Belle's results, we evaluated this branching fraction which turned out to be compatible with that reported by Belle, although with a large uncertainty. This is the motivation to seek for improvements on our previous evaluation of $\tau^- \to \nu_{\tau}\pi^-\ell^+\ell^-$ decays ($\ell=e,\,\mu$). In this paper we improve our calculation of the $WP^-\gamma^*$ vertex by including flavour symmetry breaking effects in the framework of the Resonance Chiral Theory. We impose QCD short-distance behaviour to constrain most parameters and data on the $\pi^-e^+e^-$ spectrum reported by Belle to fix the remaining free ones. As a result, improved predictions for the branching ratios and hadronic/leptonic spectra are reported, in good agreement with observations. Analogous calculations for the strangeness-changing $\tau^- \to \nu_{\tau}K^-\ell^+\ell^-$ transitions are reported for the first time. Albeit one expects the $m_{\pi\mu^+\mu^-}$ spectrum to be measured in Belle-II and the observables with $\ell=e$ can be improved, it is rather unlikely that the $K$ channels can be measured due to the suppression factor $|V_{ud}/V_{us}|^2=0.05$.
|
hep-ph/9405334
|
Giovanni Amelino-Camelia
|
G. Amelino-Camelia, F. Buccella, and L. Rosa
|
Majorana Masses for Neutrinos in SO(10)
|
published in Proceedings of the Second International Workshop on
Neutrino Telescopes, VENEZIA/2/13-15/90, edited by Milla Baldo Ceolin (1990),
Plain Tex, (1 figure not included)
| null | null | null |
hep-ph
| null |
We study the predictions for Majorana masses for neutrinos in SO(10)
grandunification models. (This paper precedes and is cited in the article
"PROTON DECAY AND NEUTRINO MASSES IN SO(10)", hep-ph/9405332)
|
[
{
"created": "Thu, 19 May 1994 20:18:34 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Amelino-Camelia",
"G.",
""
],
[
"Buccella",
"F.",
""
],
[
"Rosa",
"L.",
""
]
] |
We study the predictions for Majorana masses for neutrinos in SO(10) grandunification models. (This paper precedes and is cited in the article "PROTON DECAY AND NEUTRINO MASSES IN SO(10)", hep-ph/9405332)
|
1211.4004
|
Marco Battaglia
|
A. Arbey, M. Battaglia, A. Djouadi and F. Mahmoudi
|
An update of the constraints on the phenomenological MSSM from the new
LHC Higgs results
|
14 pages, 8 figures. This update is based on results presented at HCP
2012 and the December 2012 CERN Council LHC Jamboree. It features larger scan
statistics and additional plots
|
Physics Letters B 720 (2013), pp. 153-160
|
10.1016/j.physletb.2013.02.001
|
CERN-PH-TH/2012-316; LPT-ORSAY-12/111
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Updated results on the search of Higgs bosons at the LHC with up to 17/fb of
data have just been presented by the ATLAS and CMS collaborations. New
constraints are provided by the LHCb and XENON experiments with the observation
of the rare decay B_s -> mu+mu- and new limits on dark matter direct detection.
In this paper, we update and extend the results on the implications of these
data on the phenomenological Minimal Supersymmetric extension of the Standard
Model (pMSSM) by using high statistics, flat scans of its 19 parameters. The
new LHC data on bb and tau tau decays of the lightest Higgs state and the new
CMS limits from the tau tau searches for the heavier Higgs states set stronger
constraints on the pMSSM parameter space.
|
[
{
"created": "Fri, 16 Nov 2012 20:02:17 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2013 17:01:31 GMT",
"version": "v2"
}
] |
2013-02-27
|
[
[
"Arbey",
"A.",
""
],
[
"Battaglia",
"M.",
""
],
[
"Djouadi",
"A.",
""
],
[
"Mahmoudi",
"F.",
""
]
] |
Updated results on the search of Higgs bosons at the LHC with up to 17/fb of data have just been presented by the ATLAS and CMS collaborations. New constraints are provided by the LHCb and XENON experiments with the observation of the rare decay B_s -> mu+mu- and new limits on dark matter direct detection. In this paper, we update and extend the results on the implications of these data on the phenomenological Minimal Supersymmetric extension of the Standard Model (pMSSM) by using high statistics, flat scans of its 19 parameters. The new LHC data on bb and tau tau decays of the lightest Higgs state and the new CMS limits from the tau tau searches for the heavier Higgs states set stronger constraints on the pMSSM parameter space.
|
2112.12395
|
Oleksandr Tomalak
|
Oleksandr Tomalak
|
Radiative (anti)neutrino energy spectra from muon, pion, and kaon decays
|
14 pages, 2 figures. v2: journal version; minor corrections
|
Phys. Lett. B 829, 137108 (2022)
|
10.1016/j.physletb.2022.137108
|
LA-UR-21-30638, FERMILAB-PUB-21-739-T
|
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
To describe low-energy (anti)neutrino fluxes in modern coherent elastic
neutrino-nucleus scattering experiments as well as high-energy fluxes in
precision-frontier projects such as the Enhanced NeUtrino BEams from kaon
Tagging (ENUBET) and the Neutrinos from STORed Muons (nuSTORM), we evaluate
(anti)neutrino energy spectra from radiative muon ($\mu^- \to e^- \bar{\nu}_e
\nu_\mu (\gamma),~\mu^+ \to e^+ {\nu}_e \bar{\nu}_\mu (\gamma)$), pion
$\pi_{\ell 2}$ ($\pi^- \to \mu^- \bar{\nu}_\mu (\gamma),~\pi^+ \to \mu^+
{\nu}_\mu (\gamma)$), and kaon $K_{\ell 2}$ ($K^- \to \mu^- \bar{\nu}_\mu
(\gamma),~K^+ \to \mu^+ {\nu}_\mu (\gamma)$) decays. We compare detailed
$\mathrm{O} \left( \alpha \right)$ distributions to the well-known tree-level
results, investigate electron-mass corrections and provide energy spectra in
analytical form. Radiative corrections introduce continuous and divergent
spectral components near the endpoint, on top of the monochromatic tree-level
meson-decay spectra, which can change the flux-averaged cross section at
$6\times 10^{-5}$ level for the scattering on $^{40}\mathrm{Ar}$ nucleus with
(anti)neutrinos from the pion decay at rest. Radiative effects modify the
expected (anti)neutrino fluxes from the muon decay around the peak region by
$3-4$ permille, which is a precision goal for next-generation artificial
neutrino sources.
|
[
{
"created": "Thu, 23 Dec 2021 07:38:50 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Apr 2022 17:21:49 GMT",
"version": "v2"
}
] |
2022-04-27
|
[
[
"Tomalak",
"Oleksandr",
""
]
] |
To describe low-energy (anti)neutrino fluxes in modern coherent elastic neutrino-nucleus scattering experiments as well as high-energy fluxes in precision-frontier projects such as the Enhanced NeUtrino BEams from kaon Tagging (ENUBET) and the Neutrinos from STORed Muons (nuSTORM), we evaluate (anti)neutrino energy spectra from radiative muon ($\mu^- \to e^- \bar{\nu}_e \nu_\mu (\gamma),~\mu^+ \to e^+ {\nu}_e \bar{\nu}_\mu (\gamma)$), pion $\pi_{\ell 2}$ ($\pi^- \to \mu^- \bar{\nu}_\mu (\gamma),~\pi^+ \to \mu^+ {\nu}_\mu (\gamma)$), and kaon $K_{\ell 2}$ ($K^- \to \mu^- \bar{\nu}_\mu (\gamma),~K^+ \to \mu^+ {\nu}_\mu (\gamma)$) decays. We compare detailed $\mathrm{O} \left( \alpha \right)$ distributions to the well-known tree-level results, investigate electron-mass corrections and provide energy spectra in analytical form. Radiative corrections introduce continuous and divergent spectral components near the endpoint, on top of the monochromatic tree-level meson-decay spectra, which can change the flux-averaged cross section at $6\times 10^{-5}$ level for the scattering on $^{40}\mathrm{Ar}$ nucleus with (anti)neutrinos from the pion decay at rest. Radiative effects modify the expected (anti)neutrino fluxes from the muon decay around the peak region by $3-4$ permille, which is a precision goal for next-generation artificial neutrino sources.
|
1705.11113
|
Chandrasekhar Chatterjee
|
Chandrasekhar Chatterjee and Muneto Nitta
|
Stable non-Abelian semi-superfluid vortices in dense QCD
|
Prepared for proceedings of Quarks and Compact Stars 2017 to be
published in JPS Conf. Proc
| null |
10.7566/JPSCP.20.011012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Color superconductivity is expected to be formed in high density quark matter
where color symmetry is spontaneously broken in the presence of di-quark
condensate. Stable non-Abelian vortices or color magnetic flux tubes exist in
the color-flavor locked phase at asymptotically high density. $\mathbb{C}P^2$
Nambu-Goldstone(NG) bosons and Majorana fermions belonging to the triplet
representation are localized around a non-Abelian vortex. We discuss the zero
mode analysis and the low-energy effective world sheet theory of a non-Abelian
vortex. We determine the interactions of these bosonic and fermionic modes by
using the nonlinear realization method. We also discuss the Aharanov-Bohm (AB)
phases of charged particles, such as, electrons, muons, and color-flavor locked
mesons made of tetra-quarks encircling around a non-Abelian vortex in the
presence of electro-magnetic fields. This is a review based on our recent works
arXiv:1602.01677, arXiv:1512.06603, arXiv:1612.09419.
|
[
{
"created": "Wed, 31 May 2017 14:33:33 GMT",
"version": "v1"
}
] |
2018-02-14
|
[
[
"Chatterjee",
"Chandrasekhar",
""
],
[
"Nitta",
"Muneto",
""
]
] |
Color superconductivity is expected to be formed in high density quark matter where color symmetry is spontaneously broken in the presence of di-quark condensate. Stable non-Abelian vortices or color magnetic flux tubes exist in the color-flavor locked phase at asymptotically high density. $\mathbb{C}P^2$ Nambu-Goldstone(NG) bosons and Majorana fermions belonging to the triplet representation are localized around a non-Abelian vortex. We discuss the zero mode analysis and the low-energy effective world sheet theory of a non-Abelian vortex. We determine the interactions of these bosonic and fermionic modes by using the nonlinear realization method. We also discuss the Aharanov-Bohm (AB) phases of charged particles, such as, electrons, muons, and color-flavor locked mesons made of tetra-quarks encircling around a non-Abelian vortex in the presence of electro-magnetic fields. This is a review based on our recent works arXiv:1602.01677, arXiv:1512.06603, arXiv:1612.09419.
|
hep-ph/9411343
|
Taekoon Lee
|
TAekoon Lee
|
Anomalous Cross Section from Perturbation Theory
|
19 pages
| null | null |
FERMILAB-PUB-94/385-T
|
hep-ph
| null |
We present the anomalous cross section for baryon number violation in the
standard model from the perturbation of large-order behavior of forward
scattering amplitudes to the order $\left(\epsilon /n\right)^{8/3}
\ln\left(\epsilon /n\right)$. An improved high energy behavior of the anomalous
cross section is observed. We also argue that the asymptotic form of
$F(\epsilon g) \equiv -g \ln \sigma_{ano} $ is given in the form: $F(\epsilon
g) \rightarrow d + c \cdot \epsilon g $ for $ \epsilon g \rightarrow \infty$
with $c, d $ constants satisfying $c, d \geq 0$, and $F(\epsilon g) >0$ for all
energies. The constants are not determined.
|
[
{
"created": "Mon, 21 Nov 1994 02:27:46 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Lee",
"TAekoon",
""
]
] |
We present the anomalous cross section for baryon number violation in the standard model from the perturbation of large-order behavior of forward scattering amplitudes to the order $\left(\epsilon /n\right)^{8/3} \ln\left(\epsilon /n\right)$. An improved high energy behavior of the anomalous cross section is observed. We also argue that the asymptotic form of $F(\epsilon g) \equiv -g \ln \sigma_{ano} $ is given in the form: $F(\epsilon g) \rightarrow d + c \cdot \epsilon g $ for $ \epsilon g \rightarrow \infty$ with $c, d $ constants satisfying $c, d \geq 0$, and $F(\epsilon g) >0$ for all energies. The constants are not determined.
|
hep-ph/9708321
|
Georg Weiglein
|
G. Weiglein
|
Precise Predictions for the W-Boson Mass
|
14 pages, LaTeX, 4 Postscript figures; talk given at the Cracow
Epiphany Conference on W Boson, Cracow, January 1997; the paper is also
available via www at
http://www-itp.physik.uni-karlsruhe.de/prep/prep97/preplist97.html
|
Acta Phys.Polon.B28:1381-1394,1997
| null |
KA-TP-06-1997
|
hep-ph
| null |
Recent results for higher-order corrections to the relation between the
vector-boson masses in the Standard Model and Supersymmetry are summarized. In
the Standard Model, the Higgs-mass dependence of the two-loop contributions to
Delta r is studied. Exact results are given for the Higgs-dependent two-loop
corrections associated with the fermions, i.e. no expansion in the top-quark
and the Higgs-boson mass is made. The results for the top quark are compared
with results of an expansion up to next-to-leading order in the top-quark mass.
Agreement is found within 30 % of the two-loop result. In Supersymmetry, the
two-loop QCD corrections to the stop- and sbottom-loop contributions to the rho
parameter are presented. The two-loop corrections modify the one-loop
contribution by up to 30 %; the gluino decouples for large masses. Contrary to
the SM case where the QCD corrections are negative and screen the one-loop
value, the corresponding corrections in the supersymmetric case are in general
positive, increasing the sensitivity in the search for scalar quarks through
their virtual effects in high-precision electroweak observables.
|
[
{
"created": "Tue, 12 Aug 1997 13:32:35 GMT",
"version": "v1"
}
] |
2011-03-17
|
[
[
"Weiglein",
"G.",
""
]
] |
Recent results for higher-order corrections to the relation between the vector-boson masses in the Standard Model and Supersymmetry are summarized. In the Standard Model, the Higgs-mass dependence of the two-loop contributions to Delta r is studied. Exact results are given for the Higgs-dependent two-loop corrections associated with the fermions, i.e. no expansion in the top-quark and the Higgs-boson mass is made. The results for the top quark are compared with results of an expansion up to next-to-leading order in the top-quark mass. Agreement is found within 30 % of the two-loop result. In Supersymmetry, the two-loop QCD corrections to the stop- and sbottom-loop contributions to the rho parameter are presented. The two-loop corrections modify the one-loop contribution by up to 30 %; the gluino decouples for large masses. Contrary to the SM case where the QCD corrections are negative and screen the one-loop value, the corresponding corrections in the supersymmetric case are in general positive, increasing the sensitivity in the search for scalar quarks through their virtual effects in high-precision electroweak observables.
|
hep-ph/9305310
| null |
A. Djouadi, M. Drees and H. K\"onig
|
Supersymmetric QCD corrections to quark pair production in e+ e-
annihilation
|
17 pages, LaTeX with EQUATION.STY, 4 figures available on request;
MAD/PH/754
|
Phys.Rev. D48 (1993) 3081-3089
|
10.1103/PhysRevD.48.3081
| null |
hep-ph
| null |
We calculate supersymmetric QCD corrections (squark/gluino loops) to quark
pair production in e+ e- annihilation, allowing for mixing between left- and
right-handed squarks and taking into account the effects of nonzero quark
masses. Corrections to the Z boson partial widths are generally small and
positive, except in the case of large b-squark mixing, where they become
negative. At high-energy e+ e- colliders, larger corrections to the total cross
sections are possible. Corrections to forward-backward asymmetries are
negligible except possibly for top quarks, where they are sensitive to t-squark
mixing. We also comment on the possibility that the gluino mass is only a few
GeV.
|
[
{
"created": "Tue, 25 May 1993 00:57:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Djouadi",
"A.",
""
],
[
"Drees",
"M.",
""
],
[
"König",
"H.",
""
]
] |
We calculate supersymmetric QCD corrections (squark/gluino loops) to quark pair production in e+ e- annihilation, allowing for mixing between left- and right-handed squarks and taking into account the effects of nonzero quark masses. Corrections to the Z boson partial widths are generally small and positive, except in the case of large b-squark mixing, where they become negative. At high-energy e+ e- colliders, larger corrections to the total cross sections are possible. Corrections to forward-backward asymmetries are negligible except possibly for top quarks, where they are sensitive to t-squark mixing. We also comment on the possibility that the gluino mass is only a few GeV.
|
1403.6729
|
Kim Maltman
|
P.A. Boyle, L. Del Debbio, N. Garron, R.J. Hudspith, E. Kerrane, K.
Maltman and J.M. Zanotti
|
A Combined NNLO Lattice-Continuum Determination of $L_{10}^r$
|
21 pages, 4 figures, 1 table. Updated references, one additional
clarifying footnote in discussion section
|
Phys. Rev. D 89, 094510 (2014)
|
10.1103/PhysRevD.89.094510
|
Trinity College Dublin preprint TCDMATH14--02, University of
Adelaide preprint ADP-14-6/T864
|
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The renormalized next-to-leading-order (NLO) chiral low-energy constant,
$L_{10}^r$, is determined in a complete next-to-next-to-leading-order (NNLO)
analysis, using a combination of lattice and continuum data for the flavor $ud$
$V-A$ correlator and results from a recent chiral sum-rule analysis of the
flavor-breaking combination of $ud$ and $us$ $V-A$ correlator differences. The
analysis also fixes two combinations of NNLO low-energy constants, the
determination of which is crucial to the precision achieved for $L_{10}^r$.
Using the results of the flavor-breaking chiral $V-A$ sum rule obtained with
current versions of the strange hadronic $\tau$ branching fractions as input,
we find $L_{10}^r(m_\rho )\, =\, -0.00346(32)$. This result represents the
first NNLO determination of $L_{10}^r$ having all inputs under full theoretical
and/or experimental control, and the best current precision for this quantity.
|
[
{
"created": "Wed, 26 Mar 2014 16:02:14 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 2014 13:59:04 GMT",
"version": "v2"
}
] |
2014-06-11
|
[
[
"Boyle",
"P. A.",
""
],
[
"Del Debbio",
"L.",
""
],
[
"Garron",
"N.",
""
],
[
"Hudspith",
"R. J.",
""
],
[
"Kerrane",
"E.",
""
],
[
"Maltman",
"K.",
""
],
[
"Zanotti",
"J. M.",
""
]
] |
The renormalized next-to-leading-order (NLO) chiral low-energy constant, $L_{10}^r$, is determined in a complete next-to-next-to-leading-order (NNLO) analysis, using a combination of lattice and continuum data for the flavor $ud$ $V-A$ correlator and results from a recent chiral sum-rule analysis of the flavor-breaking combination of $ud$ and $us$ $V-A$ correlator differences. The analysis also fixes two combinations of NNLO low-energy constants, the determination of which is crucial to the precision achieved for $L_{10}^r$. Using the results of the flavor-breaking chiral $V-A$ sum rule obtained with current versions of the strange hadronic $\tau$ branching fractions as input, we find $L_{10}^r(m_\rho )\, =\, -0.00346(32)$. This result represents the first NNLO determination of $L_{10}^r$ having all inputs under full theoretical and/or experimental control, and the best current precision for this quantity.
|
hep-ph/0403284
|
A. A. Arkhipov
|
A.A. Arkhipov
|
What Can we Learn about $\Theta$ Baryon from Unified Picture for Hadron
Spectra
|
28 pages, 13 figures, 2 Tables; misprint removed; analysis of ZEUS
and DUBNA PBC experiments added, discussion extended, references added
| null | null | null |
hep-ph hep-ex nucl-ex
| null |
An analysis of the recent results from several experimental groups reported
observation of a new $\Theta$ baryon has been presented from a view point of
the unified picture for hadron spectra developed early \cite{12}. It is shown
that, in fact, two different $\Theta$ baryons have been discovered. We have
also established that both $\Theta$ baryons are excellently incorporated in the
unified picture for hadron spectra. It is argued that the presented
experimental material revealed an existence of the positive srangeness $\Theta$
partners for the observed $\Lambda$ and $\Sigma$ states with negative
strangeness as we predicted.
|
[
{
"created": "Mon, 29 Mar 2004 17:35:33 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Apr 2004 16:55:34 GMT",
"version": "v2"
},
{
"created": "Tue, 25 May 2004 16:54:44 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Arkhipov",
"A. A.",
""
]
] |
An analysis of the recent results from several experimental groups reported observation of a new $\Theta$ baryon has been presented from a view point of the unified picture for hadron spectra developed early \cite{12}. It is shown that, in fact, two different $\Theta$ baryons have been discovered. We have also established that both $\Theta$ baryons are excellently incorporated in the unified picture for hadron spectra. It is argued that the presented experimental material revealed an existence of the positive srangeness $\Theta$ partners for the observed $\Lambda$ and $\Sigma$ states with negative strangeness as we predicted.
|
2203.16881
|
Tingfei Li
|
Bo Feng, Tingfei Li
|
PV-Reduction of Sunset Topology with Auxiliary Vector
|
36 pages,1 figure, 3 tables
| null |
10.1088/1572-9494/ac7f97
| null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
Passarino-Veltman (PV) reduction method has been proved to be very useful for
the computation of general one-loop integrals. However, not much progress has
been made when applying to higher loops. Recently, we have improved the
PV-reduction method by introducing an auxiliary vector. In this paper, we apply
our new method to the simplest two-loop integrals, i.e., the sunset topology.
We show how to use differential operators to establish algebraic recursion
relations for reduction coefficients. Our algorithm can be easily applied to
the reduction of integrals with arbitrary high-rank tensor structures. We
demonstrate the efficiency of our algorithm by computing the reduction with the
total tensor rank up to four.
|
[
{
"created": "Thu, 31 Mar 2022 08:21:27 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2022 11:36:10 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jul 2022 14:30:46 GMT",
"version": "v3"
}
] |
2022-09-14
|
[
[
"Feng",
"Bo",
""
],
[
"Li",
"Tingfei",
""
]
] |
Passarino-Veltman (PV) reduction method has been proved to be very useful for the computation of general one-loop integrals. However, not much progress has been made when applying to higher loops. Recently, we have improved the PV-reduction method by introducing an auxiliary vector. In this paper, we apply our new method to the simplest two-loop integrals, i.e., the sunset topology. We show how to use differential operators to establish algebraic recursion relations for reduction coefficients. Our algorithm can be easily applied to the reduction of integrals with arbitrary high-rank tensor structures. We demonstrate the efficiency of our algorithm by computing the reduction with the total tensor rank up to four.
|
hep-ph/9907417
|
Mary Alberg
|
Mary Alberg (1 and 2), Ernest M. Henley (1 and 3), and Gerald A.
Miller (1) ((1) University of Washington, (2) Seattle University, (3)
Institute for Nuclear Theory)
|
Omega Meson Cloud and the Proton's Light Anti-Quark Distribution
|
6 pages, 2 figures, LaTex
|
Phys.Lett.B471:396-399,2000
|
10.1016/S0370-2693(99)01419-7
|
NT@UW-99-37
|
hep-ph nucl-th
| null |
We use the meson cloud model of the nucleon to calculate distribution
functions for $(\bar {d} - \bar{u})$ and $ \bar{d}/\bar{u}$ in the proton.
Including the effect of the omega meson cloud, with a coupling constant
$g_\omega^2/4\pi\approx 8$, allows a reasonably good description of the data.
|
[
{
"created": "Mon, 19 Jul 1999 18:14:13 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Alberg",
"Mary",
"",
"1 and 2"
],
[
"Henley",
"Ernest M.",
"",
"1 and 3"
],
[
"Miller",
"Gerald A.",
""
]
] |
We use the meson cloud model of the nucleon to calculate distribution functions for $(\bar {d} - \bar{u})$ and $ \bar{d}/\bar{u}$ in the proton. Including the effect of the omega meson cloud, with a coupling constant $g_\omega^2/4\pi\approx 8$, allows a reasonably good description of the data.
|
1504.07126
|
Yuji Omura
|
Yuji Omura
|
Natural SUSY from unification of SUSY breaking and GUT breaking
|
4 pages, 4 figures, to appear in the proceedings of Toyama
International Workshop on Higgs as a Probe of New Physics 2015, 11-15,
February, 2015
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce an explicit supersymmetric unification model where grand unified
gauge symmetry breaking and supersymmetry (SUSY) breaking are caused by the
same field. Besides, the SM-charged particles are also predicted by the
symmetry breaking sector, and their loop corrections induce the soft SUSY
breaking terms. Especially, nonzero A-term and B-term are generated at one-loop
level according to the mediation via the vector superfields, so that the
electro-weak symmetry breaking and 125 GeV Higgs mass could be achieved even if
the stop mass is around 1 TeV.
|
[
{
"created": "Mon, 27 Apr 2015 15:12:30 GMT",
"version": "v1"
}
] |
2015-04-28
|
[
[
"Omura",
"Yuji",
""
]
] |
We introduce an explicit supersymmetric unification model where grand unified gauge symmetry breaking and supersymmetry (SUSY) breaking are caused by the same field. Besides, the SM-charged particles are also predicted by the symmetry breaking sector, and their loop corrections induce the soft SUSY breaking terms. Especially, nonzero A-term and B-term are generated at one-loop level according to the mediation via the vector superfields, so that the electro-weak symmetry breaking and 125 GeV Higgs mass could be achieved even if the stop mass is around 1 TeV.
|
hep-ph/9305293
|
Felix Schlumpf
|
Felix Schlumpf
|
Magnetic Moments of the Baryon Decuplet in a Relativistic Quark Model
|
10 pages ReVTeX, SLAC-PUB-6218
|
Phys.Rev. D48 (1993) 4478-4480
|
10.1103/PhysRevD.48.4478
| null |
hep-ph
| null |
The magnetic moments of the baryon decuplet are calculated in a relativistic
constituent quark model using the light-front formalism. Of particular interest
are the magnetic moments of the $\Omega^-$ and $\Delta^{++}$ for which new
recent experimental measurements are available. Our calculation for the
magnetic moment ratio $\mu(\Delta^{++})/\mu(p)$ is in excellent agreement with
the experimental ratio, while our ratio $\mu(\Omega^-)/\mu(\Lambda^0)$ is
slightly higher than the experimental ratio.
|
[
{
"created": "Thu, 20 May 1993 20:18:37 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Schlumpf",
"Felix",
""
]
] |
The magnetic moments of the baryon decuplet are calculated in a relativistic constituent quark model using the light-front formalism. Of particular interest are the magnetic moments of the $\Omega^-$ and $\Delta^{++}$ for which new recent experimental measurements are available. Our calculation for the magnetic moment ratio $\mu(\Delta^{++})/\mu(p)$ is in excellent agreement with the experimental ratio, while our ratio $\mu(\Omega^-)/\mu(\Lambda^0)$ is slightly higher than the experimental ratio.
|
hep-ph/9412234
|
Michael Martin Nieto
|
Michael Martin Nieto, T. Goldman, John D. Anderson, Eunice L. Lau, and
J. P\'erez-Mercader
|
Theoretical Motivation for Gravitation Experiments on Ultra-Low Energy
Antiprotons and Antihydrogen
|
Written version of invited contribution to LEAP'94: Third Biennial
Conference on Low-Energy Antiproton Physics. LaTeX, 9 pages
|
Third Biennial Conference on Low-Energy Antiproton Physics,
LEAP'94, ed. G. Kernel, P. Krizan, and M. Mikuz (World Sci. 1995) 606
| null |
LA-UR-94-3953; LAEFF-94/14
|
hep-ph astro-ph gr-qc
| null |
We know that the generally accepted theories of gravity and quantum mechanics
are fundamentally incompatible. Thus, when we try to combine these theories, we
must beware of physical pitfalls. Modern theories of quantum gravity are trying
to overcome these problems. Any ideas must confront the present agreement with
general relativity, but yet be free to wonder about not understood phenomena,
such as the dark matter problem and the anomalous spacecraft data which we
announce here. This all has led some ``intrepid" theorists to consider a new
gravitational regime, that of antimatter. Even more ``daring" experimentalists
are attempting, or considering attempting, the measurement of the gravitational
force on antimatter, including low-energy antiprotons and, perhaps most
enticing, antihydrogen.
|
[
{
"created": "Mon, 5 Dec 1994 16:52:27 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nieto",
"Michael Martin",
""
],
[
"Goldman",
"T.",
""
],
[
"Anderson",
"John D.",
""
],
[
"Lau",
"Eunice L.",
""
],
[
"Pérez-Mercader",
"J.",
""
]
] |
We know that the generally accepted theories of gravity and quantum mechanics are fundamentally incompatible. Thus, when we try to combine these theories, we must beware of physical pitfalls. Modern theories of quantum gravity are trying to overcome these problems. Any ideas must confront the present agreement with general relativity, but yet be free to wonder about not understood phenomena, such as the dark matter problem and the anomalous spacecraft data which we announce here. This all has led some ``intrepid" theorists to consider a new gravitational regime, that of antimatter. Even more ``daring" experimentalists are attempting, or considering attempting, the measurement of the gravitational force on antimatter, including low-energy antiprotons and, perhaps most enticing, antihydrogen.
|
hep-ph/0511265
|
Robertus Potting
|
R. Lehnert and R. Potting
|
Vacuum Cherenkov radiation in Maxwell-Chern-Simons electrodynamics
|
9 pages, 3 figures, presented at the Third Meeting on CPT and Lorentz
Symmetry, Bloomington, Indiana, August 2004
| null |
10.1142/9789812702173_0025
| null |
hep-ph
| null |
We study the Cherenkov effect in the context of the Maxwell-Chern-Simons
(MCS) limit of the Standard Model Extension. We present a method to determine
the exact radiation rate for a point charge.
|
[
{
"created": "Tue, 22 Nov 2005 22:36:47 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Lehnert",
"R.",
""
],
[
"Potting",
"R.",
""
]
] |
We study the Cherenkov effect in the context of the Maxwell-Chern-Simons (MCS) limit of the Standard Model Extension. We present a method to determine the exact radiation rate for a point charge.
|
1603.03772
|
John Kearney
|
Roni Harnik, Kiel Howe and John Kearney
|
Tadpole-Induced Electroweak Symmetry Breaking and pNGB Higgs Models
|
21 pages, 5 figures
| null |
10.1007/JHEP03(2017)111
|
FERMILAB-PUB-16-076-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate induced electroweak symmetry breaking (EWSB) in models in
which the Higgs is a pseudo-Nambu-Goldstone boson (pNGB). In pNGB Higgs models,
Higgs properties and precision electroweak measurements imply a hierarchy
between the EWSB and global symmetry-breaking scales, $v_H \ll f_H$. When the
pNGB potential is generated radiatively, this hierarchy requires fine-tuning to
a degree of at least $\sim v_H^2/f_H^2$. We show that if Higgs EWSB is induced
by a tadpole arising from an auxiliary sector at scale $f_\Sigma \ll v_H$, this
tuning is significantly ameliorated or can even be removed. We present explicit
examples both in Twin Higgs models and in Composite Higgs models based on
$SO(5)/SO(4)$. For the Twin case, the result is a fully natural model with $f_H
\sim 1$ TeV and the lightest colored top partners at 2 TeV. These models also
have an appealing mechanism to generate the scales of the auxiliary sector and
Higgs EWSB directly from the scale $f_H$, with a natural hierarchy $f_\Sigma
\ll v_H \ll f_H \sim{\rm TeV}$. The framework predicts modified Higgs coupling
as well as new Higgs and vector states at LHC13.
|
[
{
"created": "Fri, 11 Mar 2016 21:00:00 GMT",
"version": "v1"
}
] |
2017-04-26
|
[
[
"Harnik",
"Roni",
""
],
[
"Howe",
"Kiel",
""
],
[
"Kearney",
"John",
""
]
] |
We investigate induced electroweak symmetry breaking (EWSB) in models in which the Higgs is a pseudo-Nambu-Goldstone boson (pNGB). In pNGB Higgs models, Higgs properties and precision electroweak measurements imply a hierarchy between the EWSB and global symmetry-breaking scales, $v_H \ll f_H$. When the pNGB potential is generated radiatively, this hierarchy requires fine-tuning to a degree of at least $\sim v_H^2/f_H^2$. We show that if Higgs EWSB is induced by a tadpole arising from an auxiliary sector at scale $f_\Sigma \ll v_H$, this tuning is significantly ameliorated or can even be removed. We present explicit examples both in Twin Higgs models and in Composite Higgs models based on $SO(5)/SO(4)$. For the Twin case, the result is a fully natural model with $f_H \sim 1$ TeV and the lightest colored top partners at 2 TeV. These models also have an appealing mechanism to generate the scales of the auxiliary sector and Higgs EWSB directly from the scale $f_H$, with a natural hierarchy $f_\Sigma \ll v_H \ll f_H \sim{\rm TeV}$. The framework predicts modified Higgs coupling as well as new Higgs and vector states at LHC13.
|
hep-ph/0006074
|
Igor M. Suslov
|
I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Russia)
|
Structure of High Order Corrections to Lipatov's Asymptotics
|
8 pages, ps
|
J.Exp.Theor.Phys. 90 (2000) 571-578; Zh.Eksp.Teor.Fiz. 117 (2000)
659-667
|
10.1134/1.559153
| null |
hep-ph cond-mat hep-th
| null |
High orders of perturbation theory can be calculated by the Lipatov method,
whereby they are determined by saddle-point configurations (instantons) of the
corresponding functional integrals. For most field theories, the Lipatov
asymptotics has the functional form c a^N \Gamma(N+b) (N is the order of
perturbation theory), and the relative corrections to it have a form of a
series in powers of 1/N. It is shown that this series diverges factorially and
its high-order coefficients can be calculated using a procedure similar to
Lipatov's one. The K-th expansion coefficient has the form
const(\ln(S1/S0))^{-K}\Gamma(K+(r1-r0)/2), where S0 and S1 are the values of
the action for the first and the second instanton of the field theory under
consideration, while r0 and r1 are the corresponding numbers of zero modes. The
instantons satisfy the same equation as in the Lipatov method and are assumed
to be renumbered in order of increasing of their action. This result has the
universal character and is valid in any field theory for which the Lipatov
asymptotic form is as specified above.
|
[
{
"created": "Thu, 8 Jun 2000 11:58:01 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Suslov",
"I. M.",
"",
"P.L.Kapitza Institute for Physical Problems, Russia"
]
] |
High orders of perturbation theory can be calculated by the Lipatov method, whereby they are determined by saddle-point configurations (instantons) of the corresponding functional integrals. For most field theories, the Lipatov asymptotics has the functional form c a^N \Gamma(N+b) (N is the order of perturbation theory), and the relative corrections to it have a form of a series in powers of 1/N. It is shown that this series diverges factorially and its high-order coefficients can be calculated using a procedure similar to Lipatov's one. The K-th expansion coefficient has the form const(\ln(S1/S0))^{-K}\Gamma(K+(r1-r0)/2), where S0 and S1 are the values of the action for the first and the second instanton of the field theory under consideration, while r0 and r1 are the corresponding numbers of zero modes. The instantons satisfy the same equation as in the Lipatov method and are assumed to be renumbered in order of increasing of their action. This result has the universal character and is valid in any field theory for which the Lipatov asymptotic form is as specified above.
|
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