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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0003253
|
Per Osland
|
A.A. Babich (Gomel), P. Osland (Bergen), A.A. Pankov (Gomel), N. Paver
(Trieste)
|
Contact interaction probes at the Linear Collider with polarized
electron and positron beams
|
1+15 pages, LaTeX2e, including 7 figures
|
Phys.Lett.B481:263-274,2000
|
10.1016/S0370-2693(00)00456-1
|
UTS-DFT-00-01
|
hep-ph
| null |
For contact-interaction searches at the Linear Collider, we discuss the
advantages of polarizing both the electron and the positron beams as compared
with polarizing only the electron beam. In particular, for the processes
e^+e^-\to \mu^+\mu^-, \tau^+\tau^-, b\bar{b} and c\bar{c} at a future e^+e^-
collider with \sqrt{s}=0.5 TeV we derive model-independent bounds on the
four-fermion contact interaction parameters from studies of the helicity cross
sections.
|
[
{
"created": "Sun, 26 Mar 2000 15:37:41 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Babich",
"A. A.",
"",
"Gomel"
],
[
"Osland",
"P.",
"",
"Bergen"
],
[
"Pankov",
"A. A.",
"",
"Gomel"
],
[
"Paver",
"N.",
"",
"Trieste"
]
] |
For contact-interaction searches at the Linear Collider, we discuss the advantages of polarizing both the electron and the positron beams as compared with polarizing only the electron beam. In particular, for the processes e^+e^-\to \mu^+\mu^-, \tau^+\tau^-, b\bar{b} and c\bar{c} at a future e^+e^- collider with \sqrt{s}=0.5 TeV we derive model-independent bounds on the four-fermion contact interaction parameters from studies of the helicity cross sections.
|
1309.6877
|
Martin Hoferichter
|
Martin Hoferichter, Gilberto Colangelo, Massimiliano Procura, Peter
Stoffer
|
Virtual photon-photon scattering
|
5 pages, 3 figures, Proceedings for the International Workshop on
e^+e^- collisions from phi to psi 2013, Rome, Italy, September 9-12, 2013
| null |
10.1142/S2010194514604001
| null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on analyticity, unitarity, and Lorentz invariance the contribution from
hadronic vacuum polarization to the anomalous magnetic moment of the muon is
directly related to the cross section of e^+e^- --> hadrons. We review the main
difficulties that impede such an approach for light-by-light scattering and
identify the required ingredients from experiment. Amongst those, the most
critical one is the scattering of two virtual photons into meson pairs. We
analyze the analytic structure of the process gamma^* gamma^* --> pi pi and
show that the usual Muskhelishvili-Omnes representation can be amended in such
a way as to remain valid even in the presence of anomalous thresholds.
|
[
{
"created": "Thu, 26 Sep 2013 12:54:59 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Hoferichter",
"Martin",
""
],
[
"Colangelo",
"Gilberto",
""
],
[
"Procura",
"Massimiliano",
""
],
[
"Stoffer",
"Peter",
""
]
] |
Based on analyticity, unitarity, and Lorentz invariance the contribution from hadronic vacuum polarization to the anomalous magnetic moment of the muon is directly related to the cross section of e^+e^- --> hadrons. We review the main difficulties that impede such an approach for light-by-light scattering and identify the required ingredients from experiment. Amongst those, the most critical one is the scattering of two virtual photons into meson pairs. We analyze the analytic structure of the process gamma^* gamma^* --> pi pi and show that the usual Muskhelishvili-Omnes representation can be amended in such a way as to remain valid even in the presence of anomalous thresholds.
|
2311.17989
|
Joel Jones-Perez
|
L. Duarte, J. Jones-P\'erez, C. Manrique-Chavil
|
Bounding the Dimension-5 Seesaw Portal with Non-Pointing Photon Searches
|
27 pages, 3 figures; v2: improved discussion, results unchanged.
Version accepted for publication in JHEP
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The addition of $d=5$ operators to the Seesaw model leads to the Dimension-5
Seesaw Portal. Here, two new operators provide interactions for the heavy
sterile neutrinos. In particular, the Higgs boson can have a large branching
ratio into two heavy neutrinos, meaning that these states can be searched for
at the LHC. Moreover, the heavy neutrinos can now decay dominantly into light
neutrinos and photons. If the heavy neutrinos are long-lived, then searches for
delayed, non-pointing photons can constrain the model. In this work, we carry
out a detailed recast of an ATLAS search for such displaced photons, triggered
by a charged lepton produced in association to the Higgs, placing bounds on the
branching ratio for Higgs decay into two heavy neutrinos as low as 2%.
|
[
{
"created": "Wed, 29 Nov 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 13:41:23 GMT",
"version": "v2"
}
] |
2024-05-08
|
[
[
"Duarte",
"L.",
""
],
[
"Jones-Pérez",
"J.",
""
],
[
"Manrique-Chavil",
"C.",
""
]
] |
The addition of $d=5$ operators to the Seesaw model leads to the Dimension-5 Seesaw Portal. Here, two new operators provide interactions for the heavy sterile neutrinos. In particular, the Higgs boson can have a large branching ratio into two heavy neutrinos, meaning that these states can be searched for at the LHC. Moreover, the heavy neutrinos can now decay dominantly into light neutrinos and photons. If the heavy neutrinos are long-lived, then searches for delayed, non-pointing photons can constrain the model. In this work, we carry out a detailed recast of an ATLAS search for such displaced photons, triggered by a charged lepton produced in association to the Higgs, placing bounds on the branching ratio for Higgs decay into two heavy neutrinos as low as 2%.
|
0904.4489
|
Abbas Kenan Ciftci
|
R. Ciftci, A. K. Ciftci
|
A Comperative Study of the Anomalous Single Production of the Fourth
Generation Quarks at ep and gamma-p Colliders
|
12 pages, 4 tables, 5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose some channels for the possible observation of anomalous
interactions of the fourth standard model generation quarks at the Large Hadron
Collider based ep and gamma-p colliders. Namely, u_4 (d_4) -> q gamma and u_4
(d_4) -> q Z -> q l^+ l^- decay processes are considered. Signatures for
signals and corresponding standard model backgrounds are investigated at both
colliders comperatively. The lowest necessary luminosities to observe these
processes and the achievable values of the anomalous coupling strengths are
determined. It is shown that the gamma-p collider is advantageous compare to
the ep collider.
|
[
{
"created": "Tue, 28 Apr 2009 21:25:24 GMT",
"version": "v1"
}
] |
2009-04-30
|
[
[
"Ciftci",
"R.",
""
],
[
"Ciftci",
"A. K.",
""
]
] |
We propose some channels for the possible observation of anomalous interactions of the fourth standard model generation quarks at the Large Hadron Collider based ep and gamma-p colliders. Namely, u_4 (d_4) -> q gamma and u_4 (d_4) -> q Z -> q l^+ l^- decay processes are considered. Signatures for signals and corresponding standard model backgrounds are investigated at both colliders comperatively. The lowest necessary luminosities to observe these processes and the achievable values of the anomalous coupling strengths are determined. It is shown that the gamma-p collider is advantageous compare to the ep collider.
|
1512.04225
|
Tanja Geib
|
Tanja Geib and Alexander Merle
|
Conversions of Bound Muons: Lepton Flavour Violation from Doubly Charged
Scalars
|
36 pages, 12 figures, Content matches published version (up to small
stylistic ambiguities)
|
Phys. Rev. D 93, 055039 (2016)
|
10.1103/PhysRevD.93.055039
|
MPP-2015-282
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first detailed computation of the conversion of a bound muon
into an electron mediated by a doubly charged $SU(2)$ singlet scalar. Although
such particles are not too exotic, up to now their contribution to $\mu$-$e$
conversion is unknown. We close this gap by presenting a detailed calculation,
which will allow the reader not only to fully comprehend the discussion but
also to generalise our results to similar cases if needed. We furthermore
compare the predictions, for both the general case and for an example model
featuring a neutrino mass at 2-loop level, to current experimental data and
future sensitivities. We show that, depending on the explicit values of the
couplings as well as on the actual future limits on the branching ratio,
$\mu$-$e$ conversion may potentially yield a lower limit on the doubly charged
singlet scalar mass which is stronger than what could be obtained by colliders.
Our results considerably strengthen the case for low-energy lepton flavour
violation searches being a very valuable addition to collider experiments.
|
[
{
"created": "Mon, 14 Dec 2015 09:24:31 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Sep 2016 09:47:13 GMT",
"version": "v2"
}
] |
2016-10-03
|
[
[
"Geib",
"Tanja",
""
],
[
"Merle",
"Alexander",
""
]
] |
We present the first detailed computation of the conversion of a bound muon into an electron mediated by a doubly charged $SU(2)$ singlet scalar. Although such particles are not too exotic, up to now their contribution to $\mu$-$e$ conversion is unknown. We close this gap by presenting a detailed calculation, which will allow the reader not only to fully comprehend the discussion but also to generalise our results to similar cases if needed. We furthermore compare the predictions, for both the general case and for an example model featuring a neutrino mass at 2-loop level, to current experimental data and future sensitivities. We show that, depending on the explicit values of the couplings as well as on the actual future limits on the branching ratio, $\mu$-$e$ conversion may potentially yield a lower limit on the doubly charged singlet scalar mass which is stronger than what could be obtained by colliders. Our results considerably strengthen the case for low-energy lepton flavour violation searches being a very valuable addition to collider experiments.
|
hep-ph/0404006
|
Felix Nagel
|
O. Nachtmann, F. Nagel, M. Pospischil
|
Anomalous gauge-boson couplings and the Higgs-boson mass
|
50 pages, 4 figures; version to appear in EPJC
|
Eur.Phys.J.C42:139-161,2005
|
10.1140/epjc/s2005-02202-5
|
HD-THEP-04-14
|
hep-ph
| null |
We study anomalous gauge-boson couplings induced by a locally SU(2) x U(1)
invariant effective Lagrangian containing ten operators of dimension six built
from the boson fields of the Standard Model (SM) before spontaneous symmetry
breaking (SSB). After SSB some operators lead to new three- and
four-gauge-boson interactions, some contribute to the diagonal and off-diagonal
kinetic terms of the gauge bosons and to the mass terms of the W and Z bosons.
This requires a renormalisation of the gauge-boson fields, which, in turn,
modifies the charged- and neutral-current interactions, although none of the
additional operators contain fermion fields. Bounds on the anomalous couplings
from electroweak precision measurements at LEP and SLD are correlated with the
Higgs-boson mass m_H. Rather moderate values of anomalous couplings allow m_H
up to 500 GeV. At a future linear collider the triple-gauge-boson couplings
gammaWW and ZWW can be measured in the reaction e+e- --> WW. We compare three
approaches to anomalous gauge-boson couplings: the form-factor approach, the
addition of anomalous coupling terms to the SM Lagrangian after and, as
outlined above, before SSB. The translation of the bounds on the couplings from
one approach to another is not straightforward. We show that it can be done for
the process e+e- --> WW by defining new effective ZWW couplings.
|
[
{
"created": "Thu, 1 Apr 2004 16:22:24 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2005 10:24:17 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Nachtmann",
"O.",
""
],
[
"Nagel",
"F.",
""
],
[
"Pospischil",
"M.",
""
]
] |
We study anomalous gauge-boson couplings induced by a locally SU(2) x U(1) invariant effective Lagrangian containing ten operators of dimension six built from the boson fields of the Standard Model (SM) before spontaneous symmetry breaking (SSB). After SSB some operators lead to new three- and four-gauge-boson interactions, some contribute to the diagonal and off-diagonal kinetic terms of the gauge bosons and to the mass terms of the W and Z bosons. This requires a renormalisation of the gauge-boson fields, which, in turn, modifies the charged- and neutral-current interactions, although none of the additional operators contain fermion fields. Bounds on the anomalous couplings from electroweak precision measurements at LEP and SLD are correlated with the Higgs-boson mass m_H. Rather moderate values of anomalous couplings allow m_H up to 500 GeV. At a future linear collider the triple-gauge-boson couplings gammaWW and ZWW can be measured in the reaction e+e- --> WW. We compare three approaches to anomalous gauge-boson couplings: the form-factor approach, the addition of anomalous coupling terms to the SM Lagrangian after and, as outlined above, before SSB. The translation of the bounds on the couplings from one approach to another is not straightforward. We show that it can be done for the process e+e- --> WW by defining new effective ZWW couplings.
|
1111.4530
|
Shuo Yang
|
Shuo Yang and Qi-Shu Yan
|
Searching for Heavy Charged Higgs Boson with Jet Substructure at the LHC
|
27 pages, 10 figures, 7 tables; v2: some typos corrected and
references added; v3: discussion added, Fig.10 and Table7 updated, version
published in JHEP
|
JHEP 1202 (2012) 074
|
10.1007/JHEP02(2012)074
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the heavy charged Higgs boson (from 800 GeV to 1500 GeV in this
study) in production associated with a top quark at the LHC with the collision
energy $\sqrt{s}=14$ TeV. Such a heavy charged Higgs boson can dominantly decay
into a top quark and a bottom quark due to its large Yukawa couplings, like in
MSSM. To suppress background events and to confirm the signal, we reconstruct
the mass bumps of the heavy charged Higgs boson and the associated top quark.
For this purpose, we propose a hybrid-R reconstruction method which utilizes
the top tagging technique, a jet substructure technique developed for highly
boosted massive particles. By using the full hadronic mode of $p p \to H^{\pm}
t \to t tb$ as a test field, we find that this method can greatly reduce the
combinatorics in the full reconstruction and can successfully reduce background
events down to a controlled level. The sensitivity of LHC to the heavy charged
Higgs boson with two $b$ taggings is studied and a $9.5\sigma$ significance can
be achieved when $m_{H^\pm} =1 \textrm{TeV}$.
|
[
{
"created": "Sat, 19 Nov 2011 03:33:23 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2011 03:28:16 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Mar 2012 01:24:58 GMT",
"version": "v3"
}
] |
2015-06-03
|
[
[
"Yang",
"Shuo",
""
],
[
"Yan",
"Qi-Shu",
""
]
] |
We study the heavy charged Higgs boson (from 800 GeV to 1500 GeV in this study) in production associated with a top quark at the LHC with the collision energy $\sqrt{s}=14$ TeV. Such a heavy charged Higgs boson can dominantly decay into a top quark and a bottom quark due to its large Yukawa couplings, like in MSSM. To suppress background events and to confirm the signal, we reconstruct the mass bumps of the heavy charged Higgs boson and the associated top quark. For this purpose, we propose a hybrid-R reconstruction method which utilizes the top tagging technique, a jet substructure technique developed for highly boosted massive particles. By using the full hadronic mode of $p p \to H^{\pm} t \to t tb$ as a test field, we find that this method can greatly reduce the combinatorics in the full reconstruction and can successfully reduce background events down to a controlled level. The sensitivity of LHC to the heavy charged Higgs boson with two $b$ taggings is studied and a $9.5\sigma$ significance can be achieved when $m_{H^\pm} =1 \textrm{TeV}$.
|
0704.1616
|
Michael Chanowitz
|
Michael S. Chanowitz
|
Reply to Comment on "Chiral suppression of scalar glueball decay"
| null |
Phys.Rev.Lett.98:149104,2007
|
10.1103/PhysRevLett.98.149104
| null |
hep-ph
| null |
Reply to the comment of Chao, He, and Ma.
|
[
{
"created": "Thu, 12 Apr 2007 16:45:36 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Chanowitz",
"Michael S.",
""
]
] |
Reply to the comment of Chao, He, and Ma.
|
1809.03071
|
Dmytro Oliinychenko
|
Dmytro Oliinychenko, Long-Gang Pang, Hannah Elfner and Volker Koch
|
Deuterons at LHC: "snowballs in hell" via hydrodynamics and hadronic
afterburner
|
13 pages, 10 figures, version accepted to publication
|
Phys. Rev. C 99, 044907 (2019)
|
10.1103/PhysRevC.99.044907
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The deuteron yield in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV is
consistent with thermal production at a freeze-out temperature of $T = 155$
MeV. The existence of deuterons with binding energy of 2.2 MeV at this
temperature was described as "snowballs in hell". We provide a microscopic
explanation of this phenomenon, utilizing relativistic hydrodynamics and
switching to a hadronic afterburner at the above mentioned temperature of $T =
155$ MeV. The measured deuteron $p_T$-spectra and coalescence parameter
$B_2(p_T)$ are reproduced without free parameters, only by implementing
experimentally known cross-sections of deuteron reactions with hadrons, most
importantly $\pi d \leftrightarrow \pi n p$.
|
[
{
"created": "Mon, 10 Sep 2018 00:55:33 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Apr 2019 00:00:45 GMT",
"version": "v2"
}
] |
2019-04-15
|
[
[
"Oliinychenko",
"Dmytro",
""
],
[
"Pang",
"Long-Gang",
""
],
[
"Elfner",
"Hannah",
""
],
[
"Koch",
"Volker",
""
]
] |
The deuteron yield in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV is consistent with thermal production at a freeze-out temperature of $T = 155$ MeV. The existence of deuterons with binding energy of 2.2 MeV at this temperature was described as "snowballs in hell". We provide a microscopic explanation of this phenomenon, utilizing relativistic hydrodynamics and switching to a hadronic afterburner at the above mentioned temperature of $T = 155$ MeV. The measured deuteron $p_T$-spectra and coalescence parameter $B_2(p_T)$ are reproduced without free parameters, only by implementing experimentally known cross-sections of deuteron reactions with hadrons, most importantly $\pi d \leftrightarrow \pi n p$.
|
hep-ph/0308119
|
Werner Rodejohann
|
W. Rodejohann
|
Neutrino mass matrices leaving no trace
|
16 pages, 2 figures
|
Phys.Lett. B579 (2004) 127-139
|
10.1016/j.physletb.2003.10.113
|
SISSA 73/2003/EP
|
hep-ph
| null |
We point attention to the fact that in SO(10) models with non-canonical (type
II) see-saw mechanism and exact b-tau unification the trace of the neutrino
mass matrix is very small, in fact practically zero. This has the advantage of
being a basis independent feature. Taking a vanishing trace as input, immediate
phenomenological consequences for the values of the neutrino masses, the CP
phases or the predictions for neutrinoless double beta decay arise. We analyze
the impact of the zero trace condition for the normal and inverted mass
ordering and in case of CP conservation and violation. Simple candidate mass
matrices with (close to) vanishing trace and non-zero U_{e3} are proposed. We
also compare the results with the other most simple basis independent property,
namely a vanishing determinant.
|
[
{
"created": "Mon, 11 Aug 2003 16:09:36 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Rodejohann",
"W.",
""
]
] |
We point attention to the fact that in SO(10) models with non-canonical (type II) see-saw mechanism and exact b-tau unification the trace of the neutrino mass matrix is very small, in fact practically zero. This has the advantage of being a basis independent feature. Taking a vanishing trace as input, immediate phenomenological consequences for the values of the neutrino masses, the CP phases or the predictions for neutrinoless double beta decay arise. We analyze the impact of the zero trace condition for the normal and inverted mass ordering and in case of CP conservation and violation. Simple candidate mass matrices with (close to) vanishing trace and non-zero U_{e3} are proposed. We also compare the results with the other most simple basis independent property, namely a vanishing determinant.
|
hep-ph/9707385
|
Susan Gardner
|
S. Gardner and H.B. O'Connell (Kentucky)
|
Rho-Omega Mixing and the Pion Form Factor in the Time-like Region
|
20 pages, REVTeX, epsfig, 2 ps figures, minor changes
|
Phys.Rev.D57:2716-2726,1998; Erratum-ibid.D62:019903,2000;
Phys.Rev.D62:019903,2000
|
10.1103/PhysRevD.57.2716 10.1103/PhysRevD.62.019903
|
UK/TP 97-10
|
hep-ph nucl-th
| null |
We determine the magnitude, phase, and $s$-dependence of $\rho$-$\omega$
``mixing'' in the pion form factor in the time-like region through fits to
$e^+e^- \ra \pi^+ \pi^-$ data. The associated systematic errors in these
quantities, arising from the functional form used to fit the $\rho$ resonance,
are small. The systematic errors in the $\rho$ mass and width, however, are
larger than previously estimated.
|
[
{
"created": "Fri, 18 Jul 1997 02:57:17 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Apr 1998 02:05:03 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Gardner",
"S.",
"",
"Kentucky"
],
[
"O'Connell",
"H. B.",
"",
"Kentucky"
]
] |
We determine the magnitude, phase, and $s$-dependence of $\rho$-$\omega$ ``mixing'' in the pion form factor in the time-like region through fits to $e^+e^- \ra \pi^+ \pi^-$ data. The associated systematic errors in these quantities, arising from the functional form used to fit the $\rho$ resonance, are small. The systematic errors in the $\rho$ mass and width, however, are larger than previously estimated.
|
hep-ph/9607353
|
Toshio Tsukamoto
|
Toshio Tsukamoto (Saga Univ.) and Yoshimasa Kurihara (KEK)
|
Single-W production to test triple gauge boson couplings at LEP
|
revised version, to appear in Physics Letters B
|
Phys.Lett. B389 (1996) 162-168
|
10.1016/S0370-2693(96)01240-3
|
SAGA-HE-106, KEK-Preprint 96-83, KEK-CP-048
|
hep-ph
| null |
We present a study of single-W production ($e^+e^-\to e^-\bar{\nu}_e W^+$) as
a new probe of the anomalous couplings at the LEP energy region. We introduce
simple cuts to separate the single-W process from W-pair production and have
performed cross-section calculations using 4-fermion generator ``grc4f''. The
cross-section of the single-W process is found to be large enough to detect at
LEP experiments in the near future. In addition, a high sensitivity to the
anomalous coupling of the $WW\gamma$ vertex is expected since the amplitude of
the $WW\gamma$ diagram makes a dominant contribution in this process. We have
found that the cross-section measurement of the single-W process in the LEP2
energy region can give complementary bounds on the anomalous couplings to those
obtained from W-pair analysis.
|
[
{
"created": "Wed, 17 Jul 1996 19:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 1996 17:27:33 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Tsukamoto",
"Toshio",
"",
"Saga Univ."
],
[
"Kurihara",
"Yoshimasa",
"",
"KEK"
]
] |
We present a study of single-W production ($e^+e^-\to e^-\bar{\nu}_e W^+$) as a new probe of the anomalous couplings at the LEP energy region. We introduce simple cuts to separate the single-W process from W-pair production and have performed cross-section calculations using 4-fermion generator ``grc4f''. The cross-section of the single-W process is found to be large enough to detect at LEP experiments in the near future. In addition, a high sensitivity to the anomalous coupling of the $WW\gamma$ vertex is expected since the amplitude of the $WW\gamma$ diagram makes a dominant contribution in this process. We have found that the cross-section measurement of the single-W process in the LEP2 energy region can give complementary bounds on the anomalous couplings to those obtained from W-pair analysis.
|
1802.06730
|
Alexander Ochirov Dr.
|
Alexander Ochirov
|
Helicity amplitudes for QCD with massive quarks
|
v3 conventions tweaked to match further work by author, supersedes
journal version
|
JHEP 1804 (2018) 089
|
10.1007/JHEP04(2018)089
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The novel massive spinor-helicity formalism of Arkani-Hamed, Huang and Huang
provides an elegant way to calculate scattering amplitudes in quantum
chromodynamics for arbitrary quark spin projections. In this note we compute
two families of tree-level QCD amplitudes with one massive quark pair and n-2
gluons. The two cases include all gluons with identical helicity and one
opposite-helicity gluon being color-adjacent to one of the quarks. Our results
naturally incorporate the previously known amplitudes for both quark spins
quantized along one of the gluonic momenta. In the all-multiplicity formulae
presented here the spin quantization axes can be tuned at will, which includes
the case of the definite-helicity quark states.
|
[
{
"created": "Mon, 19 Feb 2018 17:52:08 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2018 10:55:17 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Dec 2018 16:51:44 GMT",
"version": "v3"
}
] |
2018-12-18
|
[
[
"Ochirov",
"Alexander",
""
]
] |
The novel massive spinor-helicity formalism of Arkani-Hamed, Huang and Huang provides an elegant way to calculate scattering amplitudes in quantum chromodynamics for arbitrary quark spin projections. In this note we compute two families of tree-level QCD amplitudes with one massive quark pair and n-2 gluons. The two cases include all gluons with identical helicity and one opposite-helicity gluon being color-adjacent to one of the quarks. Our results naturally incorporate the previously known amplitudes for both quark spins quantized along one of the gluonic momenta. In the all-multiplicity formulae presented here the spin quantization axes can be tuned at will, which includes the case of the definite-helicity quark states.
|
0706.4119
|
Eef van Beveren
|
Eef van Beveren and George Rupp
|
Relating multichannel scattering and production amplitudes in a
microscopic OZI-based model
|
16 pages, 3 figures, plain LaTeX;
|
Annals Phys.323:1215-1229,2008
|
10.1016/j.aop.2007.11.012
| null |
hep-ph
| null |
Relations between scattering and production amplitudes are studied in a
microscopic multichannel model for meson-meson scattering, with coupling to
confined quark-antiquark channels. Overlapping resonances and a proper
threshold behaviour are treated exactly in the model. Under the spectator
assumption, it is found that the two-particle production amplitude shares a
common denominator with the elastic scattering amplitude, besides a numerator
consisting of a linear combination of all elastic and some inelastic matrix
elements. The coefficients in these linear combinations are shown to be
generally complex. Finally, the standard operator expressions relating
production and scattering amplitudes, viz. A=T/V and Im(A)=T*A, are fulfilled,
while in the small-coupling limit the usual isobar model is recovered.
|
[
{
"created": "Thu, 28 Jun 2007 17:19:59 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2007 12:51:23 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
Relations between scattering and production amplitudes are studied in a microscopic multichannel model for meson-meson scattering, with coupling to confined quark-antiquark channels. Overlapping resonances and a proper threshold behaviour are treated exactly in the model. Under the spectator assumption, it is found that the two-particle production amplitude shares a common denominator with the elastic scattering amplitude, besides a numerator consisting of a linear combination of all elastic and some inelastic matrix elements. The coefficients in these linear combinations are shown to be generally complex. Finally, the standard operator expressions relating production and scattering amplitudes, viz. A=T/V and Im(A)=T*A, are fulfilled, while in the small-coupling limit the usual isobar model is recovered.
|
1712.01244
|
Fei Wang
|
Junjie Cao, Lei Feng, Xiaofei Guo, Liangliang Shang, Fei Wang, Peiwen
Wu, Lei Zu
|
Explaining the DAMPE data with scalar dark matter and gauged
$U(1)_{L_e-L_\mu}$ interaction
|
15 pages, 4 figures
|
Eur. Phys. J. C (2018) 78: 198
|
10.1140/epjc/s10052-018-5678-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the peak structure observed by recent DAMPE experiment in
$e^+e^-$ cosmic-ray spectrum, we consider a scalar dark matter (DM) model with
gauged $U(1)_{L_e-L_\mu}$ symmetry, which is the most economical anomaly-free
theory to potentially explain the peak by DM annihilation in nearby subhalo. We
utilize the process $\chi \chi \to Z^\prime Z^\prime \to l \bar{l} l^\prime
\bar{l}^\prime$, where $\chi$, $Z^\prime$, $l^{(\prime)}$ denote the scalar DM,
the new gauge boson and $l^{(\prime)} =e, \mu$, respectively, to generate the
$e^+e^-$ spectrum. By fitting the predicted spectrum to the experimental data,
we obtain the favored DM mass range $m_\chi \simeq 3060^{+80}_{-100} \, {\rm
GeV}$ and $\Delta m \equiv m_\chi - m_{Z^\prime} \lesssim 14 \, {\rm GeV}$ at
$68\%$ Confidence Level (C.L.). Furthermore, we determine the parameter space
of the model which can explain the peak and meanwhile satisfy the constraints
from DM relic abundance, DM direct detection and the collider bounds. We
conclude that the model we consider can account for the peak, although there
exists a tension with the constraints from the LEP-II bound on $m_{Z^\prime}$
arising from the cross section measurement of $e^+e^- \to Z^{\prime\ast} \to
e^+ e^-$.
|
[
{
"created": "Mon, 4 Dec 2017 18:38:44 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 17:40:45 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Feb 2018 17:05:14 GMT",
"version": "v3"
},
{
"created": "Mon, 4 Jun 2018 18:29:26 GMT",
"version": "v4"
}
] |
2018-06-06
|
[
[
"Cao",
"Junjie",
""
],
[
"Feng",
"Lei",
""
],
[
"Guo",
"Xiaofei",
""
],
[
"Shang",
"Liangliang",
""
],
[
"Wang",
"Fei",
""
],
[
"Wu",
"Peiwen",
""
],
[
"Zu",
"Lei",
""
]
] |
Inspired by the peak structure observed by recent DAMPE experiment in $e^+e^-$ cosmic-ray spectrum, we consider a scalar dark matter (DM) model with gauged $U(1)_{L_e-L_\mu}$ symmetry, which is the most economical anomaly-free theory to potentially explain the peak by DM annihilation in nearby subhalo. We utilize the process $\chi \chi \to Z^\prime Z^\prime \to l \bar{l} l^\prime \bar{l}^\prime$, where $\chi$, $Z^\prime$, $l^{(\prime)}$ denote the scalar DM, the new gauge boson and $l^{(\prime)} =e, \mu$, respectively, to generate the $e^+e^-$ spectrum. By fitting the predicted spectrum to the experimental data, we obtain the favored DM mass range $m_\chi \simeq 3060^{+80}_{-100} \, {\rm GeV}$ and $\Delta m \equiv m_\chi - m_{Z^\prime} \lesssim 14 \, {\rm GeV}$ at $68\%$ Confidence Level (C.L.). Furthermore, we determine the parameter space of the model which can explain the peak and meanwhile satisfy the constraints from DM relic abundance, DM direct detection and the collider bounds. We conclude that the model we consider can account for the peak, although there exists a tension with the constraints from the LEP-II bound on $m_{Z^\prime}$ arising from the cross section measurement of $e^+e^- \to Z^{\prime\ast} \to e^+ e^-$.
|
1709.09860
|
German F. R. Sborlini
|
German F. R. Sborlini, Felix Driencourt-Mangin, German Rodrigo
|
On the universal structure of Higgs amplitudes mediated by heavy
particles
|
5 pages, no figures. Contribution to the Proceedings of the EPS-HEP
2017 Conference
|
PoS(EPS-HEP2017)767
| null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe the calculation of the one-loop corrections to $H \to \gamma
\gamma$ and $g g \to H$ within the four-dimensional unsubtraction/loop-tree
duality (FDU/LTD) approach. The fact that these corrections are both IR and UV
finite is not enough to perform the computation without a proper regularization
of the intermediate steps. We show how the FDU/LTD method unambiguously leads
to the proper result with a pure four-dimensional representation of the loop
amplitude. Moreover, this method allows us to obtain very compact expressions
which share the same functional structure independently of the particles
circulating the loop. Besides this, asymptotic expansions for the low and high
mass regime naturally arise as a consequence of the smoothness of the
integrands obtained to describe the amplitudes.
|
[
{
"created": "Thu, 28 Sep 2017 09:13:45 GMT",
"version": "v1"
}
] |
2017-09-29
|
[
[
"Sborlini",
"German F. R.",
""
],
[
"Driencourt-Mangin",
"Felix",
""
],
[
"Rodrigo",
"German",
""
]
] |
We describe the calculation of the one-loop corrections to $H \to \gamma \gamma$ and $g g \to H$ within the four-dimensional unsubtraction/loop-tree duality (FDU/LTD) approach. The fact that these corrections are both IR and UV finite is not enough to perform the computation without a proper regularization of the intermediate steps. We show how the FDU/LTD method unambiguously leads to the proper result with a pure four-dimensional representation of the loop amplitude. Moreover, this method allows us to obtain very compact expressions which share the same functional structure independently of the particles circulating the loop. Besides this, asymptotic expansions for the low and high mass regime naturally arise as a consequence of the smoothness of the integrands obtained to describe the amplitudes.
|
2310.05744
|
Andreas Vogt
|
S. Moch (Hamburg U., Inst. Theor. Phys. II), B. Ruijl (ETH, Zurich),
T. Ueda (Juntendo U.), J. Vermaseren (Nikhef, Amsterdam), A. Vogt (Liverpool
U., Dept. Math.)
|
Additional moments and x-space approximations of four-loop splitting
functions in QCD
|
14 pages, 3 figures. Analytical and numerical results in ancillary
FORM and Fortran files
| null | null |
DESY-23-150, Nikhef 23-016, LTH 1354
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We have extended our previous computations of the even-N moments of the
flavour-singlet four-loop splitting functions to N = 12 for the pure-singlet
quark case and N = 10 for all other cases. These results, obtained using
physical quantities in inclusive deep-inelastic scattering, have been and will
be used to validate conceptionally much more challenging determinations of
these splitting functions from off-shell operator matrix elements (OMEs). For
the quark-gluon and gluon-gluon splitting functions, which have yet to be
computed to higher N using OMEs, we construct approximations based on our
moments and endpoint constraints, where we present new large-x results for the
gluon-gluon case. These approximations facilitate an approximate N^3LO
evolution of parton distributions which are sufficiently accurate outside the
region of small momentum fractions x.
|
[
{
"created": "Mon, 9 Oct 2023 14:19:08 GMT",
"version": "v1"
}
] |
2023-10-10
|
[
[
"Moch",
"S.",
"",
"Hamburg U., Inst. Theor. Phys. II"
],
[
"Ruijl",
"B.",
"",
"ETH, Zurich"
],
[
"Ueda",
"T.",
"",
"Juntendo U."
],
[
"Vermaseren",
"J.",
"",
"Nikhef, Amsterdam"
],
[
"Vogt",
"A.",
"",
"Liverpool\n U., Dept. Math."
]
] |
We have extended our previous computations of the even-N moments of the flavour-singlet four-loop splitting functions to N = 12 for the pure-singlet quark case and N = 10 for all other cases. These results, obtained using physical quantities in inclusive deep-inelastic scattering, have been and will be used to validate conceptionally much more challenging determinations of these splitting functions from off-shell operator matrix elements (OMEs). For the quark-gluon and gluon-gluon splitting functions, which have yet to be computed to higher N using OMEs, we construct approximations based on our moments and endpoint constraints, where we present new large-x results for the gluon-gluon case. These approximations facilitate an approximate N^3LO evolution of parton distributions which are sufficiently accurate outside the region of small momentum fractions x.
|
2011.05505
|
Lei Chang
|
Lei Chang and Minghui Ding
|
The rainbow modified-ladder approximation and degenerate pion
|
9 pages, 4 figures
|
Phys. Rev. D 103, 074001 (2021)
|
10.1103/PhysRevD.103.074001
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Correlation functions can be described by the corresponding equations,
$viz.$, gap equation for quark propagator and the inhomogeneous Bethe-Salpeter
equation for vector dressed-fermion-Abelian-gauge-boson vertex in which
specific truncations have to be implemented. The general vector and
axial-vector Ward-Green-Takahashi identities require these correlation
functions to be interconnected, in consequence of this, truncations made must
be controlled consistently. It turns out that if the rainbow approximation is
assumed in gap equation, the scattering kernel in Bethe-Salpeter equation can
adopt the ladder approximation, which is one of the most basic attempts to
truncate the scattering kernel. Additionally, a modified-ladder approximation
is also found to be a possible symmetry-preserving truncation scheme. As an
illustration of this approximation for application a treatment of pion is
included. Pion mass and decay constant are found to be degenerate in ladder and
modified-ladder approximations, even though the Bethe-Salpeter amplitude are
with apparent distinction. The justification for the modified-ladder
approximation is examined with the help of the Gell-Mann-Oakes-Renner (GMOR)
relation.
|
[
{
"created": "Wed, 11 Nov 2020 01:55:44 GMT",
"version": "v1"
}
] |
2021-04-07
|
[
[
"Chang",
"Lei",
""
],
[
"Ding",
"Minghui",
""
]
] |
Correlation functions can be described by the corresponding equations, $viz.$, gap equation for quark propagator and the inhomogeneous Bethe-Salpeter equation for vector dressed-fermion-Abelian-gauge-boson vertex in which specific truncations have to be implemented. The general vector and axial-vector Ward-Green-Takahashi identities require these correlation functions to be interconnected, in consequence of this, truncations made must be controlled consistently. It turns out that if the rainbow approximation is assumed in gap equation, the scattering kernel in Bethe-Salpeter equation can adopt the ladder approximation, which is one of the most basic attempts to truncate the scattering kernel. Additionally, a modified-ladder approximation is also found to be a possible symmetry-preserving truncation scheme. As an illustration of this approximation for application a treatment of pion is included. Pion mass and decay constant are found to be degenerate in ladder and modified-ladder approximations, even though the Bethe-Salpeter amplitude are with apparent distinction. The justification for the modified-ladder approximation is examined with the help of the Gell-Mann-Oakes-Renner (GMOR) relation.
|
hep-ph/0403177
|
Hans Weda
|
J. Weda (University of Utrecht, The Netherlands) and J.A. Tjon
(Jefferson Lab, USA)
|
Effects of perturbative exchanges in a QCD-string model
|
37 pages Revtex with 2 figures, to be published in Phys. Atom. Nucl.
dedicated to the 70th Birthday of Yu. A. Simonov
|
Phys.Atom.Nucl.68:591-608,2005; Yad.Fiz.68:621-639,2005
|
10.1134/1.1903089
|
ITP-UU-04/08
|
hep-ph nucl-th
| null |
The QCD-string model for baryons derived by Simonov and used for the
calculation of baryon magnetic moments in a previous paper is extended to
include also perturbative gluon and meson exchanges. The mass spectrum of the
baryon multiplet is studied. For the meson interaction either the pseudoscalar
or pseudovector coupling is used. Predictions are compared with the
experimental data. Besides these exchanges the influence of excited quark
orbitals on the baryon ground state are considered by performing a multichannel
calculation. The nucleon-Delta splitting increases due to the mixing of higher
quark states while the baryon magnetic momenta decrease. The multichannel
calculation with perturbative exchanges is shown to yield reasonable magnetic
moments while the mass spectrum is close to experiment.
|
[
{
"created": "Tue, 16 Mar 2004 14:31:42 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Weda",
"J.",
"",
"University of Utrecht, The Netherlands"
],
[
"Tjon",
"J. A.",
"",
"Jefferson Lab, USA"
]
] |
The QCD-string model for baryons derived by Simonov and used for the calculation of baryon magnetic moments in a previous paper is extended to include also perturbative gluon and meson exchanges. The mass spectrum of the baryon multiplet is studied. For the meson interaction either the pseudoscalar or pseudovector coupling is used. Predictions are compared with the experimental data. Besides these exchanges the influence of excited quark orbitals on the baryon ground state are considered by performing a multichannel calculation. The nucleon-Delta splitting increases due to the mixing of higher quark states while the baryon magnetic momenta decrease. The multichannel calculation with perturbative exchanges is shown to yield reasonable magnetic moments while the mass spectrum is close to experiment.
|
hep-ph/9908211
|
Luis Bento
|
Luis Bento and Zurab Berezhiani
|
Classical Nambu-Goldstone fields
|
11 pages, updated, to appear in PRD
|
Phys.Rev. D62 (2000) 055003
|
10.1103/PhysRevD.62.055003
|
CFNUL/99-02, DFAQ/99/TH/03
|
hep-ph
| null |
It is shown that a Nambu-Goldstone (NG) field may be coherently produced by a
large number of particles in spite of the fact that the NG bosons do not couple
to flavor conserving scalar densities like $\bar{\psi}\psi$. If a flavor
oscillation process takes place the phases of the pseudo-scalar or flavor
violating densities of different particles do not necessarily cancel each
other. The NG boson gets a macroscopic source whenever the total (spontaneously
broken) quantum number carried by the source particles suffers a net increase
or decrease in time. If the lepton numbers are spontaneously broken such
classical NG (majoron) fields may significantly change the neutrino oscillation
processes in stars pushing the observational capabilities of neutrino-majoron
couplings down to $m_{\nu}/300$ GeV.
|
[
{
"created": "Mon, 2 Aug 1999 00:54:41 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2000 12:28:29 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Bento",
"Luis",
""
],
[
"Berezhiani",
"Zurab",
""
]
] |
It is shown that a Nambu-Goldstone (NG) field may be coherently produced by a large number of particles in spite of the fact that the NG bosons do not couple to flavor conserving scalar densities like $\bar{\psi}\psi$. If a flavor oscillation process takes place the phases of the pseudo-scalar or flavor violating densities of different particles do not necessarily cancel each other. The NG boson gets a macroscopic source whenever the total (spontaneously broken) quantum number carried by the source particles suffers a net increase or decrease in time. If the lepton numbers are spontaneously broken such classical NG (majoron) fields may significantly change the neutrino oscillation processes in stars pushing the observational capabilities of neutrino-majoron couplings down to $m_{\nu}/300$ GeV.
|
1311.5389
|
Stefan Floerchinger
|
Stefan Floerchinger and Christof Wetterich
|
Isotropization from Color Field Condensate in heavy ion collisions
|
30 pages, 11 figures, published version
| null |
10.1007/JHEP03(2014)121
|
CERN-PH-TH/2013-280
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The expanding fireball shortly after a heavy ion collision may be
qualitatively described by a condensate of color fields or gluons which is
analogous to Bose-Einstein-condensation for massive bosonic particles. This
condensate is a transient non-equilibrium phenomenon and breaks Lorentz-boost
symmetry. The dynamics of color field condensates involves collective
excitations and is rather different from the perturbative scattering of gluons.
In particular, it provides for an efficient mechanism to render the local
pressure approximately isotropic after a short time of 0.2 fm/c. We suggest
that an isotropic color field condensate may play a central role for a simple
description of prethermalization and isotropization in the early stages of the
collision.
|
[
{
"created": "Thu, 21 Nov 2013 13:06:29 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2014 11:34:22 GMT",
"version": "v2"
}
] |
2014-08-28
|
[
[
"Floerchinger",
"Stefan",
""
],
[
"Wetterich",
"Christof",
""
]
] |
The expanding fireball shortly after a heavy ion collision may be qualitatively described by a condensate of color fields or gluons which is analogous to Bose-Einstein-condensation for massive bosonic particles. This condensate is a transient non-equilibrium phenomenon and breaks Lorentz-boost symmetry. The dynamics of color field condensates involves collective excitations and is rather different from the perturbative scattering of gluons. In particular, it provides for an efficient mechanism to render the local pressure approximately isotropic after a short time of 0.2 fm/c. We suggest that an isotropic color field condensate may play a central role for a simple description of prethermalization and isotropization in the early stages of the collision.
|
1307.7999
|
Marcin Badziak
|
Marcin Badziak, Marek Olechowski, Stefan Pokorski
|
Light staus and enhanced Higgs diphoton rate with non-universal gaugino
masses and SO(10) Yukawa unification
|
28 pages, 8 figures, comments and references added, matches published
version
|
JHEP 10 (2013) 088
|
10.1007/JHEP10(2013)088
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that substantially enhanced Higgs to diphoton rate induced by
light staus with large left-right mixing in MSSM requires at the GUT scale
non-universal gaugino masses with bino and/or wino lighter than gluino. The
possibility of such enhancement is investigated in MSSM models with arbitrary
gaugino masses at the GUT scale with additional restriction of top-bottom-tau
Yukawa unification, as predicted by minimal SO(10) GUTs. Many patterns of
gaugino masses leading to enhanced Higgs to diphoton rate and the Yukawa
unification are identified. Some of these patterns can be accommodated in a
well-motivated scenarios such as mirage mediation or SUSY breaking F-terms
being a non-singlet of SO(10). Phenomenological implications of a scenario with
non-universal gaugino masses generated by a mixture of the singlet F-term and
the F-term in a 24-dimensional representation of SU(5) $\subset$ SO(10) are
studied in detail. Possible non-universalities of other soft terms generated by
such F-terms are discussed. The enhancement of Higgs to diphoton rate up to 30%
can be obtained in agreement with all phenomenological constraints, including
vacuum metastability bounds. The lightest sbottom and pseudoscalar Higgs are
within easy reach of the 14 TeV LHC. The LSP can be either bino-like or
wino-like. The thermal relic abundance in the former case may be in agreement
with the cosmological data thanks to efficient stau coannihilation.
|
[
{
"created": "Tue, 30 Jul 2013 14:34:58 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Oct 2013 15:15:14 GMT",
"version": "v2"
}
] |
2013-10-18
|
[
[
"Badziak",
"Marcin",
""
],
[
"Olechowski",
"Marek",
""
],
[
"Pokorski",
"Stefan",
""
]
] |
It is shown that substantially enhanced Higgs to diphoton rate induced by light staus with large left-right mixing in MSSM requires at the GUT scale non-universal gaugino masses with bino and/or wino lighter than gluino. The possibility of such enhancement is investigated in MSSM models with arbitrary gaugino masses at the GUT scale with additional restriction of top-bottom-tau Yukawa unification, as predicted by minimal SO(10) GUTs. Many patterns of gaugino masses leading to enhanced Higgs to diphoton rate and the Yukawa unification are identified. Some of these patterns can be accommodated in a well-motivated scenarios such as mirage mediation or SUSY breaking F-terms being a non-singlet of SO(10). Phenomenological implications of a scenario with non-universal gaugino masses generated by a mixture of the singlet F-term and the F-term in a 24-dimensional representation of SU(5) $\subset$ SO(10) are studied in detail. Possible non-universalities of other soft terms generated by such F-terms are discussed. The enhancement of Higgs to diphoton rate up to 30% can be obtained in agreement with all phenomenological constraints, including vacuum metastability bounds. The lightest sbottom and pseudoscalar Higgs are within easy reach of the 14 TeV LHC. The LSP can be either bino-like or wino-like. The thermal relic abundance in the former case may be in agreement with the cosmological data thanks to efficient stau coannihilation.
|
1304.3558
|
Abhishek Iyer M
|
Abhishek M Iyer and Sudhir K Vempati
|
Warped Alternatives to Froggatt-Nielsen Models
|
7 Figures, 34 pages. Minor modifications of the text mostly typos and
references added. A couple of typos fixed in the tables. Conclusions
unchanged
| null |
10.1103/PhysRevD.88.016005
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/3.0/
|
We consider Randall-Sundrum set up (RS) to be a theory of flavour, as an
alternative to Froggatt-Nielsen models instead of as a solution to the
hierarchy problem. We consider a modified RS framework between the Planck scale
and the GUT scale. This also alleviates constraints from flavour physics.
Fermion masses and mixing angles are fit at the GUT scale. The ranges of the
bulk mass parameters are determined using a $\chi^2$ fit taking in to
consideration the variation in $\mathcal{O}(1)$ parameters. In the hadronic
sector, the heavy top quark requires large bulk mass parameters localising the
right handed top quark close to the IR brane. Two cases of neutrino masses are
considered (a) Planck scale lepton number violation and (b) Dirac neutrino
masses. Contrary to the case of weak scale RS models, both these cases give
reasonable fits to the data, with the Planck scale lepton number violation
fitting slightly better compared to the Dirac case. In the Supersymmetric
version, the fits are not significantly different except for the variation in
$\tan\beta$. If the Higgs superfield and the SUSY breaking spurion are
localized on the same brane then the structure of the sfermion masses are
determined by the profiles of the zero modes of the hypermultiplets in the
bulk. Trilinear terms have the same structure as the Yukawa matrices. The
resultant squark spectrum is around $\sim 2-3 \text{TeV}$ required by the light
Higgs mass to be around 125 GeV and to satisfy the flavour violating
constraints.
|
[
{
"created": "Fri, 12 Apr 2013 07:45:21 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2013 19:19:24 GMT",
"version": "v2"
}
] |
2013-08-09
|
[
[
"Iyer",
"Abhishek M",
""
],
[
"Vempati",
"Sudhir K",
""
]
] |
We consider Randall-Sundrum set up (RS) to be a theory of flavour, as an alternative to Froggatt-Nielsen models instead of as a solution to the hierarchy problem. We consider a modified RS framework between the Planck scale and the GUT scale. This also alleviates constraints from flavour physics. Fermion masses and mixing angles are fit at the GUT scale. The ranges of the bulk mass parameters are determined using a $\chi^2$ fit taking in to consideration the variation in $\mathcal{O}(1)$ parameters. In the hadronic sector, the heavy top quark requires large bulk mass parameters localising the right handed top quark close to the IR brane. Two cases of neutrino masses are considered (a) Planck scale lepton number violation and (b) Dirac neutrino masses. Contrary to the case of weak scale RS models, both these cases give reasonable fits to the data, with the Planck scale lepton number violation fitting slightly better compared to the Dirac case. In the Supersymmetric version, the fits are not significantly different except for the variation in $\tan\beta$. If the Higgs superfield and the SUSY breaking spurion are localized on the same brane then the structure of the sfermion masses are determined by the profiles of the zero modes of the hypermultiplets in the bulk. Trilinear terms have the same structure as the Yukawa matrices. The resultant squark spectrum is around $\sim 2-3 \text{TeV}$ required by the light Higgs mass to be around 125 GeV and to satisfy the flavour violating constraints.
|
2005.09700
|
George Savvidy K
|
Roland Kirschner and George Savvidy
|
Parton Distribution Functions and Tensor Gluons
|
12 pages, references added. arXiv admin note: substantial text
overlap with arXiv:1310.0856, arXiv:1511.00274
| null | null |
NRCPS-HE-27-2020
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We further consider a possibility that inside the proton and, more generally,
inside the hadrons, there are additional partons - tensor gluons, which can
carry a part of the proton momentum. The tensorgluons have zero electric
charge, like gluons, but have a larger spin. Inside the proton a nonzero
density of the tensorgluons can be generated by the emission of tensorgluons by
gluons. The last mechanism is typical for non-Abelian tensor gauge theories.
The process of gluon splitting suggests that part of the proton momentum that
was carried by neutral partons is shared between vector and tensor gluons. We
derive the regularised evolution equations for the parton distribution
functions that take into account these new processes. In particular, this will
allow to solve numerically the extended DIGLAP equations and to find out the
ratio of densities between gluons and tensorgluons.
|
[
{
"created": "Tue, 19 May 2020 18:38:13 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jun 2020 16:25:59 GMT",
"version": "v2"
}
] |
2020-06-04
|
[
[
"Kirschner",
"Roland",
""
],
[
"Savvidy",
"George",
""
]
] |
We further consider a possibility that inside the proton and, more generally, inside the hadrons, there are additional partons - tensor gluons, which can carry a part of the proton momentum. The tensorgluons have zero electric charge, like gluons, but have a larger spin. Inside the proton a nonzero density of the tensorgluons can be generated by the emission of tensorgluons by gluons. The last mechanism is typical for non-Abelian tensor gauge theories. The process of gluon splitting suggests that part of the proton momentum that was carried by neutral partons is shared between vector and tensor gluons. We derive the regularised evolution equations for the parton distribution functions that take into account these new processes. In particular, this will allow to solve numerically the extended DIGLAP equations and to find out the ratio of densities between gluons and tensorgluons.
|
2201.03714
|
Carlos Mu\~noz Camacho
|
F. Georges, M.N.H. Rashad, A. Stefanko, M. Dlamini, B. Karki, S.F.
Ali, P-J. Lin, H-S Ko, N. Israel, D. Adikaram, Z. Ahmed, H. Albataineh, B.
Aljawrneh, K. Allada, S. Allison, S. Alsalmi, D. Androic, K. Aniol, J.
Annand, H. Atac, T. Averett, C. Ayerbe Gayoso, X. Bai, J. Bane, S. Barcus, K.
Bartlett, V. Bellini, R. Beminiwattha, J. Bericic, D. Biswas, E. Brash, D.
Bulumulla, J. Campbell, A. Camsonne, M. Carmignotto, J. Castellano, C. Chen,
J-P. Chen, T. Chetry, M.E. Christy, E. Cisbani, B. Clary, E. Cohen, N.
Compton, J.C. Cornejo, S. Covrig Dusa, B. Crowe, S. Danagoulian, T. Danley,
F. De Persio, W. Deconinck, M. Defurne, C. Desnault, D. Di, M. Duer, B.
Duran, R. Ent, C. Fanelli, G. Franklin, E. Fuchey, C. Gal, D. Gaskell, T.
Gautam, O. Glamazdin, K. Gnanvo, V.M. Gray, C. Gu, T. Hague, G. Hamad, D.
Hamilton, K. Hamilton, O. Hansen, F. Hauenstein, W. Henry, D.W. Higinbotham,
T. Holmstrom, T. Horn, Y. Huang, G.M. Huber, C. Hyde, H. Ibrahim, C-M. Jen,
K. Jin, M. Jones, A. Kabir, C. Keppel, V. Khachatryan, P.M. King, S. Li, W.B.
Li, J. Liu, H. Liu, A. Liyanage, J. Magee, S. Malace, J. Mammei, P.
Markowitz, E. McClellan, M. Mazouz, F. Meddi, D. Meekins, K. Mesik, R.
Michaels, A. Mkrtchyan, R. Montgomery, C. Mu\~noz Camacho, L.S. Myers, P.
Nadel-Turonski, S.J. Nazeer, V. Nelyubin, D. Nguyen, N. Nuruzzaman, M. Nycz,
O.F. Obretch, L. Ou, C. Palatchi, B. Pandey, S. Park, K. Park, C. Peng, R.
Pomatsalyuk, E. Pooser, A.J.R. Puckett, V. Punjabi, B. Quinn, S. Rahman, P.E.
Reimer, J. Roche, I. Sapkota, A. Sarty, B. Sawatzky, N.H. Saylor, B.
Schmookler, M.H. Shabestari, A. Shahinyan, S. Sirca, G.R. Smith, S.
Sooriyaarachchilage, N. Sparveris, R. Spies, T. Su, A. Subedi, V. Sulkosky,
A. Sun, L. Thorne, Y. Tian, N. Ton, F. Tortorici, R. Trotta, G.M. Urciuoli,
E. Voutier, B. Waidyawansa, Y. Wang, B. Wojtsekhowski, S. Wood, X. Yan, L.
Ye, Z. Ye, C. Yero, J. Zhang, Y. Zhao, and P. Zhu
|
Deeply virtual Compton scattering cross section at high Bjorken $x_B$
| null | null |
10.1103/PhysRevLett.128.252002
| null |
hep-ph hep-ex nucl-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We report high-precision measurements of the Deeply Virtual Compton
Scattering (DVCS) cross section at high values of the Bjorken variable $x_B$.
DVCS is sensitive to the Generalized Parton Distributions of the nucleon, which
provide a three-dimensional description of its internal constituents. Using the
exact analytic expression of the DVCS cross section for all possible
polarization states of the initial and final electron and nucleon, and final
state photon, we present the first experimental extraction of all four
helicity-conserving Compton Form Factors (CFFs) of the nucleon as a function of
$x_B$, while systematically including helicity flip amplitudes. In particular,
the high accuracy of the present data demonstrates sensitivity to some very
poorly known CFFs.
|
[
{
"created": "Tue, 11 Jan 2022 00:31:00 GMT",
"version": "v1"
}
] |
2022-07-13
|
[
[
"Georges",
"F.",
""
],
[
"Rashad",
"M. N. H.",
""
],
[
"Stefanko",
"A.",
""
],
[
"Dlamini",
"M.",
""
],
[
"Karki",
"B.",
""
],
[
"Ali",
"S. F.",
""
],
[
"Lin",
"P-J.",
""
],
[
"Ko",
"H-S",
""
],
[
"Israel",
"N.",
""
],
[
"Adikaram",
"D.",
""
],
[
"Ahmed",
"Z.",
""
],
[
"Albataineh",
"H.",
""
],
[
"Aljawrneh",
"B.",
""
],
[
"Allada",
"K.",
""
],
[
"Allison",
"S.",
""
],
[
"Alsalmi",
"S.",
""
],
[
"Androic",
"D.",
""
],
[
"Aniol",
"K.",
""
],
[
"Annand",
"J.",
""
],
[
"Atac",
"H.",
""
],
[
"Averett",
"T.",
""
],
[
"Gayoso",
"C. Ayerbe",
""
],
[
"Bai",
"X.",
""
],
[
"Bane",
"J.",
""
],
[
"Barcus",
"S.",
""
],
[
"Bartlett",
"K.",
""
],
[
"Bellini",
"V.",
""
],
[
"Beminiwattha",
"R.",
""
],
[
"Bericic",
"J.",
""
],
[
"Biswas",
"D.",
""
],
[
"Brash",
"E.",
""
],
[
"Bulumulla",
"D.",
""
],
[
"Campbell",
"J.",
""
],
[
"Camsonne",
"A.",
""
],
[
"Carmignotto",
"M.",
""
],
[
"Castellano",
"J.",
""
],
[
"Chen",
"C.",
""
],
[
"Chen",
"J-P.",
""
],
[
"Chetry",
"T.",
""
],
[
"Christy",
"M. E.",
""
],
[
"Cisbani",
"E.",
""
],
[
"Clary",
"B.",
""
],
[
"Cohen",
"E.",
""
],
[
"Compton",
"N.",
""
],
[
"Cornejo",
"J. C.",
""
],
[
"Dusa",
"S. Covrig",
""
],
[
"Crowe",
"B.",
""
],
[
"Danagoulian",
"S.",
""
],
[
"Danley",
"T.",
""
],
[
"De Persio",
"F.",
""
],
[
"Deconinck",
"W.",
""
],
[
"Defurne",
"M.",
""
],
[
"Desnault",
"C.",
""
],
[
"Di",
"D.",
""
],
[
"Duer",
"M.",
""
],
[
"Duran",
"B.",
""
],
[
"Ent",
"R.",
""
],
[
"Fanelli",
"C.",
""
],
[
"Franklin",
"G.",
""
],
[
"Fuchey",
"E.",
""
],
[
"Gal",
"C.",
""
],
[
"Gaskell",
"D.",
""
],
[
"Gautam",
"T.",
""
],
[
"Glamazdin",
"O.",
""
],
[
"Gnanvo",
"K.",
""
],
[
"Gray",
"V. M.",
""
],
[
"Gu",
"C.",
""
],
[
"Hague",
"T.",
""
],
[
"Hamad",
"G.",
""
],
[
"Hamilton",
"D.",
""
],
[
"Hamilton",
"K.",
""
],
[
"Hansen",
"O.",
""
],
[
"Hauenstein",
"F.",
""
],
[
"Henry",
"W.",
""
],
[
"Higinbotham",
"D. W.",
""
],
[
"Holmstrom",
"T.",
""
],
[
"Horn",
"T.",
""
],
[
"Huang",
"Y.",
""
],
[
"Huber",
"G. M.",
""
],
[
"Hyde",
"C.",
""
],
[
"Ibrahim",
"H.",
""
],
[
"Jen",
"C-M.",
""
],
[
"Jin",
"K.",
""
],
[
"Jones",
"M.",
""
],
[
"Kabir",
"A.",
""
],
[
"Keppel",
"C.",
""
],
[
"Khachatryan",
"V.",
""
],
[
"King",
"P. M.",
""
],
[
"Li",
"S.",
""
],
[
"Li",
"W. B.",
""
],
[
"Liu",
"J.",
""
],
[
"Liu",
"H.",
""
],
[
"Liyanage",
"A.",
""
],
[
"Magee",
"J.",
""
],
[
"Malace",
"S.",
""
],
[
"Mammei",
"J.",
""
],
[
"Markowitz",
"P.",
""
],
[
"McClellan",
"E.",
""
],
[
"Mazouz",
"M.",
""
],
[
"Meddi",
"F.",
""
],
[
"Meekins",
"D.",
""
],
[
"Mesik",
"K.",
""
],
[
"Michaels",
"R.",
""
],
[
"Mkrtchyan",
"A.",
""
],
[
"Montgomery",
"R.",
""
],
[
"Camacho",
"C. Muñoz",
""
],
[
"Myers",
"L. S.",
""
],
[
"Nadel-Turonski",
"P.",
""
],
[
"Nazeer",
"S. J.",
""
],
[
"Nelyubin",
"V.",
""
],
[
"Nguyen",
"D.",
""
],
[
"Nuruzzaman",
"N.",
""
],
[
"Nycz",
"M.",
""
],
[
"Obretch",
"O. F.",
""
],
[
"Ou",
"L.",
""
],
[
"Palatchi",
"C.",
""
],
[
"Pandey",
"B.",
""
],
[
"Park",
"S.",
""
],
[
"Park",
"K.",
""
],
[
"Peng",
"C.",
""
],
[
"Pomatsalyuk",
"R.",
""
],
[
"Pooser",
"E.",
""
],
[
"Puckett",
"A. J. R.",
""
],
[
"Punjabi",
"V.",
""
],
[
"Quinn",
"B.",
""
],
[
"Rahman",
"S.",
""
],
[
"Reimer",
"P. E.",
""
],
[
"Roche",
"J.",
""
],
[
"Sapkota",
"I.",
""
],
[
"Sarty",
"A.",
""
],
[
"Sawatzky",
"B.",
""
],
[
"Saylor",
"N. H.",
""
],
[
"Schmookler",
"B.",
""
],
[
"Shabestari",
"M. H.",
""
],
[
"Shahinyan",
"A.",
""
],
[
"Sirca",
"S.",
""
],
[
"Smith",
"G. R.",
""
],
[
"Sooriyaarachchilage",
"S.",
""
],
[
"Sparveris",
"N.",
""
],
[
"Spies",
"R.",
""
],
[
"Su",
"T.",
""
],
[
"Subedi",
"A.",
""
],
[
"Sulkosky",
"V.",
""
],
[
"Sun",
"A.",
""
],
[
"Thorne",
"L.",
""
],
[
"Tian",
"Y.",
""
],
[
"Ton",
"N.",
""
],
[
"Tortorici",
"F.",
""
],
[
"Trotta",
"R.",
""
],
[
"Urciuoli",
"G. M.",
""
],
[
"Voutier",
"E.",
""
],
[
"Waidyawansa",
"B.",
""
],
[
"Wang",
"Y.",
""
],
[
"Wojtsekhowski",
"B.",
""
],
[
"Wood",
"S.",
""
],
[
"Yan",
"X.",
""
],
[
"Ye",
"L.",
""
],
[
"Ye",
"Z.",
""
],
[
"Yero",
"C.",
""
],
[
"Zhang",
"J.",
""
],
[
"Zhao",
"Y.",
""
],
[
"Zhu",
"P.",
""
]
] |
We report high-precision measurements of the Deeply Virtual Compton Scattering (DVCS) cross section at high values of the Bjorken variable $x_B$. DVCS is sensitive to the Generalized Parton Distributions of the nucleon, which provide a three-dimensional description of its internal constituents. Using the exact analytic expression of the DVCS cross section for all possible polarization states of the initial and final electron and nucleon, and final state photon, we present the first experimental extraction of all four helicity-conserving Compton Form Factors (CFFs) of the nucleon as a function of $x_B$, while systematically including helicity flip amplitudes. In particular, the high accuracy of the present data demonstrates sensitivity to some very poorly known CFFs.
|
hep-ph/0310054
|
Luis Anchordoqui
|
Luis Anchordoqui and Haim Goldberg
|
Footprints of Super-GZK Cosmic Rays in the Pilliga State Forest
|
7 pages revtex, 7 figures
|
Phys.Lett. B583 (2004) 213-221
|
10.1016/j.physletb.2003.12.072
|
NUB-3241-TH-03
|
hep-ph astro-ph gr-qc hep-ex hep-th
| null |
High energy cosmic ray data collected by the SUGAR Collaboration in the
Pilliga State Forest have been re-analyzed using up-to-date shower simulations.
Complete, inclined angle, Monte Carlo simulations reveal 2 events with energies
in excess of $7\times 10^{19}$ eV at 95% CL, independent of the choice of
hadronic interaction model and of chemical composition of the primary. An
additional 3 events, with mean energy $\agt 7\times 10^{19}$ eV, were also
re-analyzed in the same manner. A lower bound on the flux at the high end of
the spectrum, as observed in the Southern sky, is presented on the basis of our
analysis.
|
[
{
"created": "Mon, 6 Oct 2003 15:17:35 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Anchordoqui",
"Luis",
""
],
[
"Goldberg",
"Haim",
""
]
] |
High energy cosmic ray data collected by the SUGAR Collaboration in the Pilliga State Forest have been re-analyzed using up-to-date shower simulations. Complete, inclined angle, Monte Carlo simulations reveal 2 events with energies in excess of $7\times 10^{19}$ eV at 95% CL, independent of the choice of hadronic interaction model and of chemical composition of the primary. An additional 3 events, with mean energy $\agt 7\times 10^{19}$ eV, were also re-analyzed in the same manner. A lower bound on the flux at the high end of the spectrum, as observed in the Southern sky, is presented on the basis of our analysis.
|
0903.2793
|
Francesca Borzumati
|
Francesca Borzumati and Toshifumi Yamashita
|
Minimal supersymmetric SU(5) model with nonrenormalizable operators:
Seesaw mechanism and violation of flavour and CP
|
108 pages, 4 figs. v4: Minor improvements. Published version. The
RGEs of App E can be found in a very explicit form at
http://www.tuhep.phys.tohoku.ac.jp/~francescaB/rges.html
|
Prog.Theor.Phys.124:761-868,2010
|
10.1143/PTP.124.761
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Flavour and CP violations that the neutrino-seesaw couplings of types I, II,
and III induce radiatively in the soft massive parameters of the minimal
supersymmetric SU(5) model, made realistic by nonrenormalizable operators, are
analyzed. Effective couplings are used to parametrize the couplings of
renormalizable operators and of the corrections that nonrenormalizable ones
provide at the tree level. It is found that for a limited, but sufficient
accuracy in the calculations of such violations, it is possible to extend the
picture of effective couplings to the quantum level, all the way to the cutoff
scale. The arbitrariness introduced by nonrenormalizable operators is analyzed
in detail. It is shown that it can be drastically reduced in the Yukawa sector
if the effective Yukawa couplings involving colored triplet Higgs bosons are
tuned to suppress the decay rate of the proton. In the supersymmetry-breaking
sector, the usual requirement of independence of flavour and field type for the
mechanism of mediation of supersymmetry breaking is not sufficient to forbid
arbitrary flavour and CP violations at the tree level. Special conditions to be
added to this requirement, under which such violations can be avoided, are
identified. Depending on how and whether these conditions are implemented,
different phenomenological scenarios emerge. Flavour and CP violations of soft
massive parameters induced by neutrino-seesaw couplings are discussed
explicitly for the simplest scenario, in which no such violations are present
at the tree level. Guidelines for studying them in other, less simple scenarios
are given. Lists of all renormalization group equations needed for their
calculations are provided for each of the three types of seesaw mechanism, at
all energies between the TeV scale and Planck scale.
|
[
{
"created": "Mon, 16 Mar 2009 16:37:06 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2009 05:45:13 GMT",
"version": "v2"
},
{
"created": "Wed, 19 May 2010 03:08:34 GMT",
"version": "v3"
},
{
"created": "Wed, 24 Nov 2010 07:02:59 GMT",
"version": "v4"
}
] |
2011-05-12
|
[
[
"Borzumati",
"Francesca",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] |
Flavour and CP violations that the neutrino-seesaw couplings of types I, II, and III induce radiatively in the soft massive parameters of the minimal supersymmetric SU(5) model, made realistic by nonrenormalizable operators, are analyzed. Effective couplings are used to parametrize the couplings of renormalizable operators and of the corrections that nonrenormalizable ones provide at the tree level. It is found that for a limited, but sufficient accuracy in the calculations of such violations, it is possible to extend the picture of effective couplings to the quantum level, all the way to the cutoff scale. The arbitrariness introduced by nonrenormalizable operators is analyzed in detail. It is shown that it can be drastically reduced in the Yukawa sector if the effective Yukawa couplings involving colored triplet Higgs bosons are tuned to suppress the decay rate of the proton. In the supersymmetry-breaking sector, the usual requirement of independence of flavour and field type for the mechanism of mediation of supersymmetry breaking is not sufficient to forbid arbitrary flavour and CP violations at the tree level. Special conditions to be added to this requirement, under which such violations can be avoided, are identified. Depending on how and whether these conditions are implemented, different phenomenological scenarios emerge. Flavour and CP violations of soft massive parameters induced by neutrino-seesaw couplings are discussed explicitly for the simplest scenario, in which no such violations are present at the tree level. Guidelines for studying them in other, less simple scenarios are given. Lists of all renormalization group equations needed for their calculations are provided for each of the three types of seesaw mechanism, at all energies between the TeV scale and Planck scale.
|
hep-ph/0501101
|
Tianjun Li
|
Junhai Kang, Tianjun Li
|
Light Sterile Neutrinos in the Supersymmetric U(1)' Models and Axion
Models
|
RevTex4, 19 pages, References added
|
Phys.Rev.D71:095011,2005
|
10.1103/PhysRevD.71.095011
| null |
hep-ph
| null |
We propose the minimal supersymmetric sterile neutrino model (MSSNM) where
the sterile neutrino masses are about 1 eV, while the active neutrino masses
and the mixings among the active and sterile neutrinos are generated during
late time phase transition. All the current experimental neutrino data include
the LSND can be explained simultaneously, and the constraints on the sterile
neutrinos from the big bang nucleosynthesis and large scale structure can be
evaded. To realize the MSSNM naturally, we consider the supersymmetric
intermediate-scale U(1)' model, the low energy U(1)' model with a secluded
U(1)'-breaking sector, and the DFSZ and KSVZ axion models. In these models, the
$\mu$ problem can be solved elegantly, and the 1 eV sterile neutrino masses can
be generated via high-dimensional operators. For the low energy U(1)' model
with a secluded U(1)'-breaking sector, we also present a scenario in which the
masses and mixings for the active and sterile neutrinos are all generated
during late time phase transition.
|
[
{
"created": "Thu, 13 Jan 2005 04:27:08 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2005 21:05:50 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kang",
"Junhai",
""
],
[
"Li",
"Tianjun",
""
]
] |
We propose the minimal supersymmetric sterile neutrino model (MSSNM) where the sterile neutrino masses are about 1 eV, while the active neutrino masses and the mixings among the active and sterile neutrinos are generated during late time phase transition. All the current experimental neutrino data include the LSND can be explained simultaneously, and the constraints on the sterile neutrinos from the big bang nucleosynthesis and large scale structure can be evaded. To realize the MSSNM naturally, we consider the supersymmetric intermediate-scale U(1)' model, the low energy U(1)' model with a secluded U(1)'-breaking sector, and the DFSZ and KSVZ axion models. In these models, the $\mu$ problem can be solved elegantly, and the 1 eV sterile neutrino masses can be generated via high-dimensional operators. For the low energy U(1)' model with a secluded U(1)'-breaking sector, we also present a scenario in which the masses and mixings for the active and sterile neutrinos are all generated during late time phase transition.
|
2110.01540
|
Shahin Iqbal
|
Yu Fu, Jacopo Ghiglieri, Shahin Iqbal, Aleksi Kurkela
|
Thermalization of non-abelian gauge theories at next-to-leading order
|
9 Pages and two figures
| null |
10.1103/PhysRevD.105.054031
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We provide the first next-to-leading-order (NLO) weak-coupling description of
the thermalization process of far-from-equilibrium systems in non-abelian gauge
theory. We study isotropic systems starting from either over- or under-occupied
initial conditions and follow their time evolution towards thermal equilibrium
by numerically solving the QCD effective kinetic theory at NLO accuracy. We
find that the NLO corrections remain well under control for a wide range of
couplings and that the overall effect of NLO corrections is to reduce the time
needed to reach thermal equilibrium in the systems considered.
|
[
{
"created": "Mon, 4 Oct 2021 16:20:20 GMT",
"version": "v1"
}
] |
2022-04-13
|
[
[
"Fu",
"Yu",
""
],
[
"Ghiglieri",
"Jacopo",
""
],
[
"Iqbal",
"Shahin",
""
],
[
"Kurkela",
"Aleksi",
""
]
] |
We provide the first next-to-leading-order (NLO) weak-coupling description of the thermalization process of far-from-equilibrium systems in non-abelian gauge theory. We study isotropic systems starting from either over- or under-occupied initial conditions and follow their time evolution towards thermal equilibrium by numerically solving the QCD effective kinetic theory at NLO accuracy. We find that the NLO corrections remain well under control for a wide range of couplings and that the overall effect of NLO corrections is to reduce the time needed to reach thermal equilibrium in the systems considered.
|
1410.6998
|
Gergely Mark\'o
|
Gergely Mark\'o, Urko Reinosa and Zsolt Sz\'ep
|
Bose-Einstein condensation and Silver Blaze property from the two-loop
$\Phi$-derivable approximation
|
22 pages, 6 figures, uses RevTeX 4-1
| null |
10.1103/PhysRevD.90.125021
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend our previous investigation of the two-loop $\Phi$-derivable
approximation to finite chemical potential $\mu$ and discuss Bose-Einstein
condensation (BEC) in the case of a charged scalar field with $O(2)$ symmetry.
We show that the approximation is renormalizable by means of counterterms which
are independent of both the temperature and the chemical potential. We point
out the presence of an additional skew contribution to the propagator as
compared to the $\mu=0$ case, which comes with its own gap equation (except at
Hartree level). We solve this equation together with the field equation, and
the usual longitudinal and transversal gap equations to find that the
transition is second order, in agreement with recent lattice results to which
we compare. We also discuss a general criterion an approximation should obey
for the so-called Silver Blaze property to hold, and we show that any
$\Phi$-derivable approximation at finite temperature and density obeys this
criterion if one chooses a UV regularization that does not cut off the
Matsubara sums.
|
[
{
"created": "Sun, 26 Oct 2014 08:11:01 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"Markó",
"Gergely",
""
],
[
"Reinosa",
"Urko",
""
],
[
"Szép",
"Zsolt",
""
]
] |
We extend our previous investigation of the two-loop $\Phi$-derivable approximation to finite chemical potential $\mu$ and discuss Bose-Einstein condensation (BEC) in the case of a charged scalar field with $O(2)$ symmetry. We show that the approximation is renormalizable by means of counterterms which are independent of both the temperature and the chemical potential. We point out the presence of an additional skew contribution to the propagator as compared to the $\mu=0$ case, which comes with its own gap equation (except at Hartree level). We solve this equation together with the field equation, and the usual longitudinal and transversal gap equations to find that the transition is second order, in agreement with recent lattice results to which we compare. We also discuss a general criterion an approximation should obey for the so-called Silver Blaze property to hold, and we show that any $\Phi$-derivable approximation at finite temperature and density obeys this criterion if one chooses a UV regularization that does not cut off the Matsubara sums.
|
2403.18630
|
Zhen-hua Zhao
|
Zhen-hua Zhao, Jing Zhang, Xiang-Yi Wu
|
Flavored leptogenesis from a sudden mass gain of right-handed neutrinos
|
16 pages, 6 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we would like to point out that in the scenario that the
right-handed neutrinos suddenly gain some masses much larger than the
temperature of the Universe at that time so that the washout effects for the
generated lepton asymmetry can be safely neglected, the flavored leptogenesis
(which crucially rely on the flavor non-universality of the washout effects)
cannot work in the usual way any more. For this problem, we put forward that
the flavor non-universality of the conversion efficiencies from the lepton
asymmetry to the baryon asymmetry via the sphaleron processes may play a
crucial role. And we will study if the requisite baryon asymmetry can be
successfully reproduced from such a mechanism in the scenarios that the
right-handed neutrino masses are hierarchical and nearly degenerate,
respectively. A detailed study shows that this mechanism can be viable in both
these two scenarios.
|
[
{
"created": "Wed, 27 Mar 2024 14:37:46 GMT",
"version": "v1"
}
] |
2024-03-28
|
[
[
"Zhao",
"Zhen-hua",
""
],
[
"Zhang",
"Jing",
""
],
[
"Wu",
"Xiang-Yi",
""
]
] |
In this paper, we would like to point out that in the scenario that the right-handed neutrinos suddenly gain some masses much larger than the temperature of the Universe at that time so that the washout effects for the generated lepton asymmetry can be safely neglected, the flavored leptogenesis (which crucially rely on the flavor non-universality of the washout effects) cannot work in the usual way any more. For this problem, we put forward that the flavor non-universality of the conversion efficiencies from the lepton asymmetry to the baryon asymmetry via the sphaleron processes may play a crucial role. And we will study if the requisite baryon asymmetry can be successfully reproduced from such a mechanism in the scenarios that the right-handed neutrino masses are hierarchical and nearly degenerate, respectively. A detailed study shows that this mechanism can be viable in both these two scenarios.
|
1811.00486
|
Seddigheh Tizchang
|
Seddigheh Tizchang, Rohoollah Mohammadi, She-Sheng Xue
|
Probing Lorentz violation effects via a laser beam interacting with a
high-energy charged lepton beam
|
11 pages, 3 figures and 2 tables
|
Eur. Phys. J. C (2019) 79: 224
|
10.1140/epjc/s10052-019-6716-5
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, the conversion of linear polarization of a laser beam to
circular one through its forward scattering by a TeV order charged lepton beam
in the presence of Lorentz violation correction is explored. We calculate the
ratio of circular polarization to linear one (Faraday Conversion phase
$\Delta\phi_{\rm{FC}}$) of the laser beam interacting with either electron or
the muon beam in the framework of the quantum Boltzmann equation.
Regarding the experimentally available sensitivity to the Faraday conversion
$\Delta\phi_{\rm{FC}}\simeq 10^{-3}-10^{-2}$, we show that the scattering of a
linearly polarized laser beam with energy $k_0\sim 0.1$ eV and an electron/muon
beam with flux $\bar{\epsilon}_{e,\mu}\sim 10^{10}/10^{12}$ TeV cm$^{-2}$
s$^{-1}$ places an upper bound on the combination of lepton sector Lorentz
violation coefficients $c_{\mu\nu}$ components
$(c_{TT}+1.4~c_{(TZ)}+0.25(c_{XX}+c_{YY}+2~c_{ZZ}))$. The obtained bound on the
combination for the electron beam is at the $4.35\times 10^{-15}$ level and for
the muon beam at the $3.9\times 10^{-13}$ level. It should be mentioned that
the laser and charged lepton beams considered here to reach the experimentally
measurable $\Delta\phi_{\rm{FC}}$ are currently available or will be accessible
in the near future. This study provides a valuable supplementary to other
theoretical and experimental frameworks for measuring and constraining Lorentz
violation coefficients.
|
[
{
"created": "Thu, 1 Nov 2018 16:30:05 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Mar 2019 18:56:27 GMT",
"version": "v2"
}
] |
2019-03-20
|
[
[
"Tizchang",
"Seddigheh",
""
],
[
"Mohammadi",
"Rohoollah",
""
],
[
"Xue",
"She-Sheng",
""
]
] |
In this work, the conversion of linear polarization of a laser beam to circular one through its forward scattering by a TeV order charged lepton beam in the presence of Lorentz violation correction is explored. We calculate the ratio of circular polarization to linear one (Faraday Conversion phase $\Delta\phi_{\rm{FC}}$) of the laser beam interacting with either electron or the muon beam in the framework of the quantum Boltzmann equation. Regarding the experimentally available sensitivity to the Faraday conversion $\Delta\phi_{\rm{FC}}\simeq 10^{-3}-10^{-2}$, we show that the scattering of a linearly polarized laser beam with energy $k_0\sim 0.1$ eV and an electron/muon beam with flux $\bar{\epsilon}_{e,\mu}\sim 10^{10}/10^{12}$ TeV cm$^{-2}$ s$^{-1}$ places an upper bound on the combination of lepton sector Lorentz violation coefficients $c_{\mu\nu}$ components $(c_{TT}+1.4~c_{(TZ)}+0.25(c_{XX}+c_{YY}+2~c_{ZZ}))$. The obtained bound on the combination for the electron beam is at the $4.35\times 10^{-15}$ level and for the muon beam at the $3.9\times 10^{-13}$ level. It should be mentioned that the laser and charged lepton beams considered here to reach the experimentally measurable $\Delta\phi_{\rm{FC}}$ are currently available or will be accessible in the near future. This study provides a valuable supplementary to other theoretical and experimental frameworks for measuring and constraining Lorentz violation coefficients.
|
1211.5061
|
Umit Kaya
|
U. Kaya, S. Sultansoy, G. Unel
|
Probing small x(g) region with the LHeC based gamma-p colliders
|
7 pages, 18 figures, 5 tables
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Potential of the LHeC for probing small x(g) region via c\bar{c} and b\bar{b}
production have been investigated. Obtained results clearly show the advantage
of gamma-p collider option. Measurement of x(g) down to 3\times10^{-6} seems to
be reachable which is two order smaller than HERA coverage.
|
[
{
"created": "Wed, 21 Nov 2012 15:37:19 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2013 16:56:27 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Feb 2014 14:11:38 GMT",
"version": "v3"
}
] |
2014-02-18
|
[
[
"Kaya",
"U.",
""
],
[
"Sultansoy",
"S.",
""
],
[
"Unel",
"G.",
""
]
] |
Potential of the LHeC for probing small x(g) region via c\bar{c} and b\bar{b} production have been investigated. Obtained results clearly show the advantage of gamma-p collider option. Measurement of x(g) down to 3\times10^{-6} seems to be reachable which is two order smaller than HERA coverage.
|
hep-ph/0509201
|
Neal Weiner
|
Neal Weiner (CCPP, NYU), Kathryn Zurek (INT, UW)
|
New Matter Effects and BBN Constraints for Mass Varying Neutrinos
|
6 pages. References added, minor modifications
|
Phys.Rev. D74 (2006) 023517
|
10.1103/PhysRevD.74.023517
|
INT-PUB 05-21
|
hep-ph
| null |
The presence of light (m_a ~ 10^-6 ev) scalar fields in the early universe
can modify the cosmology of neutrinos considerably by allowing their masses to
vary on cosmological times. In this paper, we consider the effect of
Planck-suppressed couplings of this scalar to electrons and show that such
couplings can easily make new sterile states thermally inaccessible in the
early universe, preserving the successes of big bang nucleosynthesis
predictions. We consider the circumstances under which these effects give the
proper initial conditions for recently considered models of neutrino dark
energy, and consider limits from tests of the equivalence principle. The
parameters which satisfy cosmological constraints naturally give rise to
interesting signals in terrestrial neutrino oscillation experiments.
|
[
{
"created": "Tue, 20 Sep 2005 19:18:02 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2006 20:48:13 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Weiner",
"Neal",
"",
"CCPP, NYU"
],
[
"Zurek",
"Kathryn",
"",
"INT, UW"
]
] |
The presence of light (m_a ~ 10^-6 ev) scalar fields in the early universe can modify the cosmology of neutrinos considerably by allowing their masses to vary on cosmological times. In this paper, we consider the effect of Planck-suppressed couplings of this scalar to electrons and show that such couplings can easily make new sterile states thermally inaccessible in the early universe, preserving the successes of big bang nucleosynthesis predictions. We consider the circumstances under which these effects give the proper initial conditions for recently considered models of neutrino dark energy, and consider limits from tests of the equivalence principle. The parameters which satisfy cosmological constraints naturally give rise to interesting signals in terrestrial neutrino oscillation experiments.
|
hep-ph/0102196
|
Nir Polonsky
|
Nir Polonsky (MIT)
|
The scale of supersymmetry breaking as a free parameter
|
9 pages, 1 figure (included). Requires espcrc2.sty (included). Talk
given at the 30 Years of Supersymmetry workshop, Oct. 2000
|
Nucl.Phys.Proc.Suppl.101:357-365,2001
|
10.1016/S0920-5632(01)01521-3
|
MIT-CTP-3085
|
hep-ph
| null |
While supersymmetric extensions of the Standard Model can be fully described
in terms of explicitly broken global supersymmetry, this description is only
effective. Once related to spontaneous breaking in a more fundamental theory,
the effective parameters translate to functions of two distinct scales, the
scale of spontaneous supersymmetry breaking and the scale of its mediation to
the standard-model fields. The scale dependence will be written explicitly and
the full spectrum of supersymmetry breaking operators which emerges will be
explored. It will be shown that, contrary to common lore, scale-dependent
operators can play an important role in determining the phenomenology. For
example, theories with low-energy supersymmetry breaking, such as gauge
mediation, may correspond to a scalar potential which is quite different than
in theories with high-energy supersymmetry breaking, such as gravity mediation.
As a concrete example, the Higgs mass prediction will be discussed in some
detail and its upper bound will be shown to be sensitive to the supersymmetry
breaking scale.
|
[
{
"created": "Thu, 15 Feb 2001 18:38:58 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Polonsky",
"Nir",
"",
"MIT"
]
] |
While supersymmetric extensions of the Standard Model can be fully described in terms of explicitly broken global supersymmetry, this description is only effective. Once related to spontaneous breaking in a more fundamental theory, the effective parameters translate to functions of two distinct scales, the scale of spontaneous supersymmetry breaking and the scale of its mediation to the standard-model fields. The scale dependence will be written explicitly and the full spectrum of supersymmetry breaking operators which emerges will be explored. It will be shown that, contrary to common lore, scale-dependent operators can play an important role in determining the phenomenology. For example, theories with low-energy supersymmetry breaking, such as gauge mediation, may correspond to a scalar potential which is quite different than in theories with high-energy supersymmetry breaking, such as gravity mediation. As a concrete example, the Higgs mass prediction will be discussed in some detail and its upper bound will be shown to be sensitive to the supersymmetry breaking scale.
|
1112.5268
|
Yonit Hochberg
|
Yonit Hochberg and Yosef Nir
|
Relating direct CP violation in D decays and the forward-backward
asymmetry in $t\bar t$ production
|
4 pages. v3: A calculation of the contribution to epsilon^prime is
presented; Conclusions unchanged
| null |
10.1103/PhysRevLett.108.261601
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The CDF and LHCb experiments have recently provided two intriguing hints for
new physics: a large forward-backward asymmetry in $t\bar t$ production, and a
direct CP asymmetry in D decays of order a percent. In both cases, flavor
non-universal interactions are required in the up sector, raising the
possibility that the two effects come from one and the same new physics source.
We show that a minimal model, with an extra scalar doublet, previously
suggested to explain the top data, gives -- without any modifications or
additions -- a contribution to CP violation in charm decays that is of the
right size.
|
[
{
"created": "Thu, 22 Dec 2011 10:44:48 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2011 13:33:10 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Feb 2012 09:46:34 GMT",
"version": "v3"
}
] |
2013-05-30
|
[
[
"Hochberg",
"Yonit",
""
],
[
"Nir",
"Yosef",
""
]
] |
The CDF and LHCb experiments have recently provided two intriguing hints for new physics: a large forward-backward asymmetry in $t\bar t$ production, and a direct CP asymmetry in D decays of order a percent. In both cases, flavor non-universal interactions are required in the up sector, raising the possibility that the two effects come from one and the same new physics source. We show that a minimal model, with an extra scalar doublet, previously suggested to explain the top data, gives -- without any modifications or additions -- a contribution to CP violation in charm decays that is of the right size.
|
hep-ph/0210020
|
Sobkow Wieslaw
|
Wieslaw Sobkow (University of Wroclaw, Poland)
|
Right-handed Neutrinos in Low-Energy Neutrino-Electron Scattering
|
REVTeX, 9 pages, 5 eps figures; published in Phys. Lett. B 555,
215-226 (2003)
|
Phys.Lett. B555 (2003) 215-226
|
10.1016/S0370-2693(03)00050-9
| null |
hep-ph
| null |
In this paper a scenario admitting the participation of the exotic scalar
coupling of the right-handed neutrinos in addition to the standard vector and
axial couplings of the left-handed neutrinos in the weak interactions is
considered. The research is based on the low-energy $(\nu_{\mu} e^{-})$ and
$(\nu_{e} e^{-})$ scattering processes. The main goal is to show how the
presence of the right-handed neutrinos in the above processes changes the
laboratory differential cross section in relation to the Standard Model
prediction. Both processes are studied at the level of the four-fermion point
interaction. Neutrinos are assumed to be polarized Dirac fermions and to be
massive. In the laboratory differential cross section, the new interference
term between the standard vector coupling of the left-handed neutrinos and
exotic scalar coupling of the right-handed neutrinos appears which does not
vanish in the limit of massless neutrino. This additional contribution,
including information about the transverse components of neutrino polarization,
generates the azimuthal asymmetry in the angular distribution of the recoil
electrons. This regularity would be a signature of the participation of the
right-handed neutrinos in the neutrino-electron scattering. The future
low-energy high-precision neutrino-electron scattering experiments using the
strong and polarized artificial neutrino source would allow to search for the
exotic effects coming from the R-handed neutrinos.
|
[
{
"created": "Tue, 1 Oct 2002 15:29:26 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 2003 18:24:41 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Sobkow",
"Wieslaw",
"",
"University of Wroclaw, Poland"
]
] |
In this paper a scenario admitting the participation of the exotic scalar coupling of the right-handed neutrinos in addition to the standard vector and axial couplings of the left-handed neutrinos in the weak interactions is considered. The research is based on the low-energy $(\nu_{\mu} e^{-})$ and $(\nu_{e} e^{-})$ scattering processes. The main goal is to show how the presence of the right-handed neutrinos in the above processes changes the laboratory differential cross section in relation to the Standard Model prediction. Both processes are studied at the level of the four-fermion point interaction. Neutrinos are assumed to be polarized Dirac fermions and to be massive. In the laboratory differential cross section, the new interference term between the standard vector coupling of the left-handed neutrinos and exotic scalar coupling of the right-handed neutrinos appears which does not vanish in the limit of massless neutrino. This additional contribution, including information about the transverse components of neutrino polarization, generates the azimuthal asymmetry in the angular distribution of the recoil electrons. This regularity would be a signature of the participation of the right-handed neutrinos in the neutrino-electron scattering. The future low-energy high-precision neutrino-electron scattering experiments using the strong and polarized artificial neutrino source would allow to search for the exotic effects coming from the R-handed neutrinos.
|
hep-ph/0308233
|
Davison E. Soper
|
Davison E. Soper
|
Partons and Jets at the LHC
|
Talk at the conference QCD2002 at IIT Kanpur, India, November 2002.
Ten pages with 12 figures
|
Pramana61:793-802,2003
|
10.1007/BF02704448
| null |
hep-ph
| null |
I review some issues related to short distance QCD and its relation to the
experimental program of the Large Hadron Collider (LHC) now under construction
in Geneva.
|
[
{
"created": "Fri, 22 Aug 2003 20:03:21 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Soper",
"Davison E.",
""
]
] |
I review some issues related to short distance QCD and its relation to the experimental program of the Large Hadron Collider (LHC) now under construction in Geneva.
|
hep-ph/9504425
|
James F. Amundson
|
James F. Amundson
|
Comparison of potential models through HQET
|
19 pages, LaTeX with epsf.sty. Figures included through uufiles.
Compressed Postscript available at
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-859.ps.Z or
http://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-859.ps.Z
|
Phys.Rev.D52:2926-2934,1995
|
10.1103/PhysRevD.52.2926
|
MAD/PH/859
|
hep-ph
| null |
I calculate heavy-light decay constants in a nonrelativistic potential model.
The resulting estimate of heavy quark symmetry breaking conflicts with similar
estimates from lattice QCD. I show that a semirelativistic potential model
eliminates the conflict. Using the results of heavy quark effective theory
allows me to identify and compensate for shortcomings in the model calculations
in addition to isolating the source of the differences in the two models. The
results lead to a rule as to where the nonrelativistic quark model gives
misleading predictions.
|
[
{
"created": "Fri, 28 Apr 1995 21:40:57 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Amundson",
"James F.",
""
]
] |
I calculate heavy-light decay constants in a nonrelativistic potential model. The resulting estimate of heavy quark symmetry breaking conflicts with similar estimates from lattice QCD. I show that a semirelativistic potential model eliminates the conflict. Using the results of heavy quark effective theory allows me to identify and compensate for shortcomings in the model calculations in addition to isolating the source of the differences in the two models. The results lead to a rule as to where the nonrelativistic quark model gives misleading predictions.
|
hep-ph/9802405
|
Marco Fabbrichesi
|
S. Bertolini, J.O. Eeg and M. Fabbrichesi
|
Estimating epsilon'/epsilon. A Review
|
42 pages, 13 figures. To appear in Reviews of Modern Physics
|
Rev.Mod.Phys.72:65-93,2000
|
10.1103/RevModPhys.72.65
|
SISSA 19/98/EP
|
hep-ph
| null |
The real part of epsilon'/epsilon measures direct CP violation in the decays
of the neutral kaons in two pions. It is a fundamental quantity which has
justly attracted a great deal of theoretical as well as experimental work. Its
determination may answer the question of whether CP violation is present only
in the mass matrix of neutral kaons (the superweak scenario) or also at work
directly in the decays. After a brief historical summary, we discuss the
present and expected experimental sensitivities. In the light of these, we come
to the problem of estimating epsilon'/epsilon in the standard model. We review
the present (circa 1998) status of the theoretical predictions of
epsilon'/epsilon. The short-distance part of the computation is now known to
the next-to-leading order in QCD and QED and therefore well under control. On
the other hand, the evaluation of the hadronic matrix element of the relevant
operators is where most of the theoretical uncertainty still resides. We
analyze the results of the currently most developed calculations. The values of
the B_i parameters in the various approaches are discussed, together with the
allowed range of the relevant combination of the Cabibbo-Kobayashi-Maskawa
entries Im V_{td}V^*_{ts}. We conclude by summarizing and comparing all
up-to-date predictions of epsilon'/epsilon. Because of the intrinsic
uncertainties of the long-distance computations, values ranging from 10^{-4} to
a few times 10^{-3} can be accounted for in the standard model. Since this
range covers most of the present experimental uncertainty, it is unlikely that
new physics effects can be disentangled from the standard model prediction. For
updates on the review and additional material see
http://www.he.sissa.it/review/.
|
[
{
"created": "Tue, 24 Feb 1998 11:40:14 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 1998 10:02:11 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Nov 1998 15:30:42 GMT",
"version": "v3"
},
{
"created": "Thu, 1 Apr 1999 08:19:39 GMT",
"version": "v4"
},
{
"created": "Tue, 4 May 1999 16:29:59 GMT",
"version": "v5"
},
{
"created": "Tue, 11 May 1999 13:20:50 GMT",
"version": "v6"
},
{
"created": "Tue, 28 Sep 1999 16:51:04 GMT",
"version": "v7"
}
] |
2009-09-25
|
[
[
"Bertolini",
"S.",
""
],
[
"Eeg",
"J. O.",
""
],
[
"Fabbrichesi",
"M.",
""
]
] |
The real part of epsilon'/epsilon measures direct CP violation in the decays of the neutral kaons in two pions. It is a fundamental quantity which has justly attracted a great deal of theoretical as well as experimental work. Its determination may answer the question of whether CP violation is present only in the mass matrix of neutral kaons (the superweak scenario) or also at work directly in the decays. After a brief historical summary, we discuss the present and expected experimental sensitivities. In the light of these, we come to the problem of estimating epsilon'/epsilon in the standard model. We review the present (circa 1998) status of the theoretical predictions of epsilon'/epsilon. The short-distance part of the computation is now known to the next-to-leading order in QCD and QED and therefore well under control. On the other hand, the evaluation of the hadronic matrix element of the relevant operators is where most of the theoretical uncertainty still resides. We analyze the results of the currently most developed calculations. The values of the B_i parameters in the various approaches are discussed, together with the allowed range of the relevant combination of the Cabibbo-Kobayashi-Maskawa entries Im V_{td}V^*_{ts}. We conclude by summarizing and comparing all up-to-date predictions of epsilon'/epsilon. Because of the intrinsic uncertainties of the long-distance computations, values ranging from 10^{-4} to a few times 10^{-3} can be accounted for in the standard model. Since this range covers most of the present experimental uncertainty, it is unlikely that new physics effects can be disentangled from the standard model prediction. For updates on the review and additional material see http://www.he.sissa.it/review/.
|
1307.4323
|
C\'edric Lorc\'e
|
C. Lorc\'e (Orsay, IPN and Orsay, LPT)
|
The proton spin decomposition : path dependence and gauge symmetry
|
9 pages, contribution to the proceedings of the QCD Evolution 2013,
May 6-10, JLab, Newport News, USA
| null |
10.1142/S2010194514600301
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the different types of decomposition of the proton spin. We stress
that, despite their lack of uniqueness, the Chen et al. and Wakamatsu
decompositions are perfectly measurable. We argue that a large part of the
recent controversies boils down to the fact that there actually exist two types
of gauge transformations in the Chen et al. approach, where physical and gauge
degrees of freedom of the gauge potential are explicitly separated. By
carefully distinguishing these two types of gauge transformations, one can
easily understand how the concepts of gauge invariance, Stueckelberg symmetry,
path dependence and measurability are linked to each other.
|
[
{
"created": "Tue, 16 Jul 2013 16:07:50 GMT",
"version": "v1"
}
] |
2014-06-25
|
[
[
"Lorcé",
"C.",
"",
"Orsay, IPN and Orsay, LPT"
]
] |
We discuss the different types of decomposition of the proton spin. We stress that, despite their lack of uniqueness, the Chen et al. and Wakamatsu decompositions are perfectly measurable. We argue that a large part of the recent controversies boils down to the fact that there actually exist two types of gauge transformations in the Chen et al. approach, where physical and gauge degrees of freedom of the gauge potential are explicitly separated. By carefully distinguishing these two types of gauge transformations, one can easily understand how the concepts of gauge invariance, Stueckelberg symmetry, path dependence and measurability are linked to each other.
|
2407.12377
|
Peter Risse
|
Peter Risse, Nasim Derakhshanian, Tomas Je\v{z}o, Karol Kova\v{r}\'ik,
Aleksander Kusina
|
A Markov Chain Monte Carlo determination of Proton PDF uncertainties at
NNLO
|
5 pages, 3 figures; contributed talk to DIS2024
| null | null |
MS-TP-24-16, IFJPAN-IV-2024-10
|
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
The current scientific standard in PDF uncertainty estimation relies either
on repeated fits over artificially generated data to arrive at Monte Carlo
samples of best fits or on the Hessian method, which uses a quadratic expansion
of the figure of merit, the $\chi^2$-function. Markov Chain Monte Carlo methods
allows one to access the uncertainties of PDFs without making use of quadratic
approximations in a statistically sound procedure while at the same time
preserving the correspondence between the sample and $\chi^2$-value. Rooted in
Bayesian statistics the $\chi^2$-function is repeatedly sampled to obtain a set
of PDFs that serves as a representation of the statistical distribution of the
PDFs in their function space. After removing the dependence between the samples
(the so-called autocorrelation) the set can be used to propagate the
uncertainties to physical observables. The final result is an independent
procedure to obtain PDF uncertainties that can be confronted by the
state-of-the-art in order to ultimately arrive at a better understanding of the
proton's structure.
|
[
{
"created": "Wed, 17 Jul 2024 07:55:50 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2024 15:14:37 GMT",
"version": "v2"
}
] |
2024-07-23
|
[
[
"Risse",
"Peter",
""
],
[
"Derakhshanian",
"Nasim",
""
],
[
"Ježo",
"Tomas",
""
],
[
"Kovařík",
"Karol",
""
],
[
"Kusina",
"Aleksander",
""
]
] |
The current scientific standard in PDF uncertainty estimation relies either on repeated fits over artificially generated data to arrive at Monte Carlo samples of best fits or on the Hessian method, which uses a quadratic expansion of the figure of merit, the $\chi^2$-function. Markov Chain Monte Carlo methods allows one to access the uncertainties of PDFs without making use of quadratic approximations in a statistically sound procedure while at the same time preserving the correspondence between the sample and $\chi^2$-value. Rooted in Bayesian statistics the $\chi^2$-function is repeatedly sampled to obtain a set of PDFs that serves as a representation of the statistical distribution of the PDFs in their function space. After removing the dependence between the samples (the so-called autocorrelation) the set can be used to propagate the uncertainties to physical observables. The final result is an independent procedure to obtain PDF uncertainties that can be confronted by the state-of-the-art in order to ultimately arrive at a better understanding of the proton's structure.
|
hep-ph/9902437
|
Johan Bijnens
|
Johan Bijnens (Lund), Gilberto Colangelo (Zurich) and Gerhard Ecker
(Vienna)
|
The Mesonic Chiral Lagrangian of Order $p^6$
|
21 pages, uses longtable.sty, one more contact term found, extensive
renumbering of 3 flavour terms
|
JHEP 9902:020,1999
|
10.1088/1126-6708/1999/02/020
|
LU TP 99-02, UWThPh-1999-02, ZU--TH 9/99
|
hep-ph
| null |
We construct the effective chiral Lagrangian for chiral perturbation theory
in the mesonic even-intrinsic-parity sector at order $p^6$. The Lagrangian
contains 112 in principle measurable + 3 contact terms for the general case of
$n$ light flavours, 90+4 for three and 53+4 for two flavours. The equivalence
between equations of motion and field redefinitions to remove spurious terms in
the Lagrangians is shown to all orders in the chiral expansion. We also discuss
and implement other methods for reducing the number of terms to a minimal set.
|
[
{
"created": "Tue, 23 Feb 1999 08:08:28 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Apr 1999 12:03:00 GMT",
"version": "v2"
}
] |
2010-02-03
|
[
[
"Bijnens",
"Johan",
"",
"Lund"
],
[
"Colangelo",
"Gilberto",
"",
"Zurich"
],
[
"Ecker",
"Gerhard",
"",
"Vienna"
]
] |
We construct the effective chiral Lagrangian for chiral perturbation theory in the mesonic even-intrinsic-parity sector at order $p^6$. The Lagrangian contains 112 in principle measurable + 3 contact terms for the general case of $n$ light flavours, 90+4 for three and 53+4 for two flavours. The equivalence between equations of motion and field redefinitions to remove spurious terms in the Lagrangians is shown to all orders in the chiral expansion. We also discuss and implement other methods for reducing the number of terms to a minimal set.
|
2311.00672
|
Yiyu Zhou
|
Zhong-Bo Kang, Hongxi Xing, Fanyi Zhao and Yiyu Zhou
|
Polarized fragmenting jet functions in Inclusive and Exclusive Jet
Production
|
49 pages, 9 figures
|
JHEP 03, 142 (2024)
|
10.1007/JHEP03(2024)142
|
MIT-CTP/5633
|
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we present a complete theoretical framework for analyzing the
distribution of polarized hadrons within jets, with and without measuring the
transverse momentum relative to the standard jet axis. Using soft-collinear
effective theory (SCET), we derive the factorization and provide the
theoretical calculation of both semi-inclusive and exclusive fragmenting jet
functions (FJFs) under longitudinal and transverse polarization. With the
polarized FJFs, one gains access to a variety of new observables that can be
used for extracting both collinear and transverse momentum dependent parton
distribution functions (PDFs) and fragmentation functions (FFs). As examples,
we provide numerical results for the spin asymmetry $A_{TU,T}^{\cos(\phi _S -
\hat{\phi}_{S_h})}$ from polarized semi-inclusive hadron-in-jet production in
polarized $pp$ collisions at RHIC kinematics, where a transversely polarized
quark would lead to the transverse spin of the final-state hadron inside the
jet and is thus sensitive to the transversity fragmentation functions.
Similarly, another spin asymmetry, $A_{TU, L}^{\cos(\phi _q - \phi _{S})}$ from
polarized exclusive hadron-in-jet production in polarized $ep$ collisions at
EIC kinematics would allow us to access the helicity fragmentation functions.
These observables demonstrate promising potential in investigating transverse
momentum dependent PDFs and FFs and are worthwhile for further measurements.
|
[
{
"created": "Wed, 1 Nov 2023 17:22:31 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2024 12:38:02 GMT",
"version": "v2"
},
{
"created": "Sun, 5 May 2024 07:46:05 GMT",
"version": "v3"
}
] |
2024-06-06
|
[
[
"Kang",
"Zhong-Bo",
""
],
[
"Xing",
"Hongxi",
""
],
[
"Zhao",
"Fanyi",
""
],
[
"Zhou",
"Yiyu",
""
]
] |
In this work, we present a complete theoretical framework for analyzing the distribution of polarized hadrons within jets, with and without measuring the transverse momentum relative to the standard jet axis. Using soft-collinear effective theory (SCET), we derive the factorization and provide the theoretical calculation of both semi-inclusive and exclusive fragmenting jet functions (FJFs) under longitudinal and transverse polarization. With the polarized FJFs, one gains access to a variety of new observables that can be used for extracting both collinear and transverse momentum dependent parton distribution functions (PDFs) and fragmentation functions (FFs). As examples, we provide numerical results for the spin asymmetry $A_{TU,T}^{\cos(\phi _S - \hat{\phi}_{S_h})}$ from polarized semi-inclusive hadron-in-jet production in polarized $pp$ collisions at RHIC kinematics, where a transversely polarized quark would lead to the transverse spin of the final-state hadron inside the jet and is thus sensitive to the transversity fragmentation functions. Similarly, another spin asymmetry, $A_{TU, L}^{\cos(\phi _q - \phi _{S})}$ from polarized exclusive hadron-in-jet production in polarized $ep$ collisions at EIC kinematics would allow us to access the helicity fragmentation functions. These observables demonstrate promising potential in investigating transverse momentum dependent PDFs and FFs and are worthwhile for further measurements.
|
hep-ph/9712213
|
Marco Aurelio Diaz
|
Marco Aurelio Diaz
|
R--Parity Breaking in Minimal Supergravity
|
5 pages including 2 figures, Latex. Talk given at the International
Europhysics Conference on High Energy Physics, EPS-HEP-1997, 19-26 August
1997, Jerusalem. Small change in the acknowledgments
| null | null |
IFIC/97-93, FTUV/97-63
|
hep-ph
| null |
We consider the Minimal Supergravity Model with universality of scalar and
gaugino masses plus an extra bilinear term in the superpotential which breaks
R-Parity and lepton number. We explicitly check the consistency of this model
with the radiative breaking of the electroweak symmetry. A neutrino mass is
radiatively induced, and large Higgs-Lepton mixings are compatible with its
experimental bound. We also study briefly the lightest Higgs mass. This
one-parameter extension of SUGRA-MSSM is the simplest way of introducing
R-parity violation.
|
[
{
"created": "Mon, 1 Dec 1997 11:55:45 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Dec 1997 13:51:08 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Diaz",
"Marco Aurelio",
""
]
] |
We consider the Minimal Supergravity Model with universality of scalar and gaugino masses plus an extra bilinear term in the superpotential which breaks R-Parity and lepton number. We explicitly check the consistency of this model with the radiative breaking of the electroweak symmetry. A neutrino mass is radiatively induced, and large Higgs-Lepton mixings are compatible with its experimental bound. We also study briefly the lightest Higgs mass. This one-parameter extension of SUGRA-MSSM is the simplest way of introducing R-parity violation.
|
1402.7074
|
Tongyan Lin
|
Asher Berlin, Tongyan Lin, and Lian-Tao Wang
|
Mono-Higgs Detection of Dark Matter at the LHC
|
11 pages
| null |
10.1007/JHEP06(2014)078
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the recent discovery of the Higgs boson, we investigate the
possibility that a missing energy plus Higgs final state is the dominant signal
channel for dark matter at the LHC. We consider examples of higher-dimension
operators where a Higgs and dark matter pair are produced through an off-shell
Z or photon, finding potential sensitivity at the LHC to cutoff scales of
around a few hundred GeV. We generalize this production mechanism to a
simplified model by introducing a Z' as well as a second Higgs doublet, where
the pseudoscalar couples to dark matter. Resonant production of the Z' which
decays to a Higgs plus invisible particles gives rise to a potential mono-Higgs
signal. This may be observable at the 14 TeV LHC at low tan beta and when the
Z' mass is roughly in the range 600 GeV to 1.3 TeV.
|
[
{
"created": "Thu, 27 Feb 2014 21:00:05 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Berlin",
"Asher",
""
],
[
"Lin",
"Tongyan",
""
],
[
"Wang",
"Lian-Tao",
""
]
] |
Motivated by the recent discovery of the Higgs boson, we investigate the possibility that a missing energy plus Higgs final state is the dominant signal channel for dark matter at the LHC. We consider examples of higher-dimension operators where a Higgs and dark matter pair are produced through an off-shell Z or photon, finding potential sensitivity at the LHC to cutoff scales of around a few hundred GeV. We generalize this production mechanism to a simplified model by introducing a Z' as well as a second Higgs doublet, where the pseudoscalar couples to dark matter. Resonant production of the Z' which decays to a Higgs plus invisible particles gives rise to a potential mono-Higgs signal. This may be observable at the 14 TeV LHC at low tan beta and when the Z' mass is roughly in the range 600 GeV to 1.3 TeV.
|
hep-ph/9609505
|
Shoichi Sasaki Rcnp
|
Shoichi Sasaki, Hideo Suganuma and Hiroshi Toki (RCNP, Osaka Univ.)
|
Finite Temperature SD Equation for Chiral Symmetry Restoration in Dual
Ginzburg-Landau Theory
|
Talk presented at International Conference on Quark Confinement and
the Hadron Spectrum II, Como, Italy, 26-29 Jun 1996. Latex, uses epsf.tex and
sprocl.sty, 4 pages, 2 postscript figures included
| null | null | null |
hep-ph
| null |
We study the chiral phase transition at $T\neq 0$ in the dual Ginzburg-Landau
theory using the Schwinger-Dyson (SD) equation. In order to solve the SD
equation at $T\neq 0$, we provide a new ansatz for the quark self-energy in the
imaginary-time formalism. The recovery of the chiral symmetry is found at
$T_{_{C}}\sim 100 MeV$ with realistic parameters, which are set by reproducing
the values of the string tension $\sqrt{\sigma}\simeq 0.44 GeV$ and the chiral
condensate $< {\bar q}q > \simeq -(250 MeV}^{3}$ at $T=0$.
|
[
{
"created": "Fri, 27 Sep 1996 15:07:12 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Oct 1996 08:38:58 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Sasaki",
"Shoichi",
"",
"RCNP, Osaka Univ."
],
[
"Suganuma",
"Hideo",
"",
"RCNP, Osaka Univ."
],
[
"Toki",
"Hiroshi",
"",
"RCNP, Osaka Univ."
]
] |
We study the chiral phase transition at $T\neq 0$ in the dual Ginzburg-Landau theory using the Schwinger-Dyson (SD) equation. In order to solve the SD equation at $T\neq 0$, we provide a new ansatz for the quark self-energy in the imaginary-time formalism. The recovery of the chiral symmetry is found at $T_{_{C}}\sim 100 MeV$ with realistic parameters, which are set by reproducing the values of the string tension $\sqrt{\sigma}\simeq 0.44 GeV$ and the chiral condensate $< {\bar q}q > \simeq -(250 MeV}^{3}$ at $T=0$.
|
1605.09671
|
Mat\'ias Reynoso M
|
Mat\'ias M. Reynoso and Oscar A. Sampayo
|
Propagation of high-energy neutrinos in a background of ultralight
scalar dark matter
|
11 pages, 11 figures, accepted for publication in Astroparticle
Physics
| null |
10.1016/j.astropartphys.2016.05.004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If high-energy neutrinos propagate in a background of ultralight scalar field
particles of dark matter ($m_\varphi \sim 10^{-23}$eV), neutrino-dark matter
interactions can play a role and affect the neutrino flux. In this work we
analyse this effect using transport equations that account for the neutrino
regeneration as well as absorption, and we consider the neutrino flux
propagation in the extragalactic medium and also through the galactic halo of
dark matter. We show the results for the final flux to arrive on Earth for
different cases of point and diffuse neutrino fluxes. {We conclude that this
type of neutrino interactions with ultralight scalar particles as dark matter
can yield very different results in the neutrino flux and in the flavor ratios
that can be measured in neutrino detectors such as IceCube.
|
[
{
"created": "Mon, 30 May 2016 13:36:44 GMT",
"version": "v1"
}
] |
2016-06-01
|
[
[
"Reynoso",
"Matías M.",
""
],
[
"Sampayo",
"Oscar A.",
""
]
] |
If high-energy neutrinos propagate in a background of ultralight scalar field particles of dark matter ($m_\varphi \sim 10^{-23}$eV), neutrino-dark matter interactions can play a role and affect the neutrino flux. In this work we analyse this effect using transport equations that account for the neutrino regeneration as well as absorption, and we consider the neutrino flux propagation in the extragalactic medium and also through the galactic halo of dark matter. We show the results for the final flux to arrive on Earth for different cases of point and diffuse neutrino fluxes. {We conclude that this type of neutrino interactions with ultralight scalar particles as dark matter can yield very different results in the neutrino flux and in the flavor ratios that can be measured in neutrino detectors such as IceCube.
|
2212.11505
|
Bao-Dong Sun
|
H. Alharazin, B.-D. Sun, E. Epelbaum, J. Gegelia, and U.-G.
Mei{\ss}ner
|
Local spatial densities for composite spin-3/2 systems
| null |
JHEP02(2023)163
|
10.1007/JHEP02(2023)163
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The definition of local spatial densities by using sharply localized
one-particle states is applied to spin-3/2 systems. Matrix elements of the
electromagnetic current and the energy-momentum tensor are considered and
integral expressions of associated spatial distributions in terms of form
factors are derived.
|
[
{
"created": "Thu, 22 Dec 2022 06:32:09 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2023 09:30:28 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Feb 2023 14:21:23 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Feb 2023 13:21:02 GMT",
"version": "v4"
}
] |
2023-02-22
|
[
[
"Alharazin",
"H.",
""
],
[
"Sun",
"B. -D.",
""
],
[
"Epelbaum",
"E.",
""
],
[
"Gegelia",
"J.",
""
],
[
"Meißner",
"U. -G.",
""
]
] |
The definition of local spatial densities by using sharply localized one-particle states is applied to spin-3/2 systems. Matrix elements of the electromagnetic current and the energy-momentum tensor are considered and integral expressions of associated spatial distributions in terms of form factors are derived.
|
hep-ph/0311194
|
Giuseppe Bozzi
|
G.Bozzi
|
Q_T resummation in Higgs boson production at the LHC
|
5 pages, 2 figures,. Talk given in italian at "Incontri sulla Fisica
delle Alte Energie", Lecce, Italy, 23-26 April 2003
| null | null | null |
hep-ph hep-ex
| null |
When considering the transverse momentum distribution (q_T) of the Higgs
boson production it is necessary to separate the small q_T region (q_T << M_H)
from the medium and large (q_T > M_H) one, the former being treated by means of
resummation techniques of logaritmhically-enhanced contributions and the latter
by fixed-order perturbation theory. Then these two approaches have to be
consistently matched to avoid double-counting in the intermediate q_T region.
Here soft gluon resummation is implemented up to NNLL order and the matching to
the corresponding NLO perturbative result is performed. Numerical results are
shown for the LHC. The main features of the differential distribution turn out
to be quite stable with respect to perturbative uncertainties.
|
[
{
"created": "Fri, 14 Nov 2003 15:40:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bozzi",
"G.",
""
]
] |
When considering the transverse momentum distribution (q_T) of the Higgs boson production it is necessary to separate the small q_T region (q_T << M_H) from the medium and large (q_T > M_H) one, the former being treated by means of resummation techniques of logaritmhically-enhanced contributions and the latter by fixed-order perturbation theory. Then these two approaches have to be consistently matched to avoid double-counting in the intermediate q_T region. Here soft gluon resummation is implemented up to NNLL order and the matching to the corresponding NLO perturbative result is performed. Numerical results are shown for the LHC. The main features of the differential distribution turn out to be quite stable with respect to perturbative uncertainties.
|
2112.06083
|
Ekaterina Kriukova
|
S. Demidov, D. Gorbunov and E. Kriukova
|
Gravitational waves from first-order electroweak phase transition in a
model with light sgoldstinos
|
30 pages, 5 figures, 3 tables; the estimate of uncertainties in GW
spectra added, figures and tables updated; published version
|
JHEP 07 (2022) 061
|
10.1007/JHEP07(2022)061
|
INR-TH-2021-023
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study previously unexplored possibility of triggering the first order
electroweak phase transition (EWPT) by interactions of the Standard Model (SM)
particles with the sector responsible for low scale supersymmetry breaking. The
low-energy theory apart from the SM particles contains additional scalar
degrees of freedom -- sgoldstinos -- which contribute to the effective scalar
potential and thus can trigger the first order EWPT. Remarkably, the latter
requires only moderate couplings in the scalar sector. The perturbative
description in terms of the effective theory seems formally to be applicable
upto the scale of supersymmetry breaking: the Landau pole in the scalar sector
is above $10^8$-$10^9$ GeV. We calculate the gravitational wave signal
generated at this transition (it can be tested, e.g. by LISA, BBO and DECIGO)
and briefly discuss the collider phenomenology of this scenario.
|
[
{
"created": "Sat, 11 Dec 2021 22:24:16 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2022 11:05:58 GMT",
"version": "v2"
}
] |
2022-07-14
|
[
[
"Demidov",
"S.",
""
],
[
"Gorbunov",
"D.",
""
],
[
"Kriukova",
"E.",
""
]
] |
We study previously unexplored possibility of triggering the first order electroweak phase transition (EWPT) by interactions of the Standard Model (SM) particles with the sector responsible for low scale supersymmetry breaking. The low-energy theory apart from the SM particles contains additional scalar degrees of freedom -- sgoldstinos -- which contribute to the effective scalar potential and thus can trigger the first order EWPT. Remarkably, the latter requires only moderate couplings in the scalar sector. The perturbative description in terms of the effective theory seems formally to be applicable upto the scale of supersymmetry breaking: the Landau pole in the scalar sector is above $10^8$-$10^9$ GeV. We calculate the gravitational wave signal generated at this transition (it can be tested, e.g. by LISA, BBO and DECIGO) and briefly discuss the collider phenomenology of this scenario.
|
2109.05440
|
Sanjin Beni\'c
|
Sanjin Beni\'c, Yoshitaka Hatta, Abhiram Kaushik, Hsiang-nan Li
|
The $g_T(x)$ contribution to single spin asymmetries in SIDIS
|
28 pages, 8 figures
| null |
10.1103/PhysRevD.104.094027
|
ZTF-EP-21-05
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by a novel origin of transverse single spin asymmetry (SSA) in
semi-inclusive Deep Inelastic Scattering (SIDIS) uncovered by some of us, we
quantitatively investigate its impact on the theoretical understanding of the
mechanism responsible for SSA. This new contribution from the quark-initiated
channel first appears in two-loop perturbation theory and involves the $g_T(x)$
distribution. We point out another entirely analogous piece from the
gluon-initiated channel proportional to the gluon helicity distribution $\Delta
G(x)$. Both contributions are solely expressed in terms of twist-two polarized
parton distribution functions and twist-two fragmentation functions in the
Wandzura-Wilczek approximation, such that they can be unambiguously evaluated
without introducing free parameters. We make predictions for measurements of
the asymmetries $A_{UT}$ at the future Electron-Ion Collider (EIC), and find
that $A_{UT}$ associated with the $\sin (\phi_h-\phi_S)$, $\sin \phi_S$ and
$\sin (2\phi_h-\phi_S)$ harmonics can reach up to 1-2\% even at the top EIC
energy.
|
[
{
"created": "Sun, 12 Sep 2021 06:25:03 GMT",
"version": "v1"
}
] |
2021-12-01
|
[
[
"Benić",
"Sanjin",
""
],
[
"Hatta",
"Yoshitaka",
""
],
[
"Kaushik",
"Abhiram",
""
],
[
"Li",
"Hsiang-nan",
""
]
] |
Motivated by a novel origin of transverse single spin asymmetry (SSA) in semi-inclusive Deep Inelastic Scattering (SIDIS) uncovered by some of us, we quantitatively investigate its impact on the theoretical understanding of the mechanism responsible for SSA. This new contribution from the quark-initiated channel first appears in two-loop perturbation theory and involves the $g_T(x)$ distribution. We point out another entirely analogous piece from the gluon-initiated channel proportional to the gluon helicity distribution $\Delta G(x)$. Both contributions are solely expressed in terms of twist-two polarized parton distribution functions and twist-two fragmentation functions in the Wandzura-Wilczek approximation, such that they can be unambiguously evaluated without introducing free parameters. We make predictions for measurements of the asymmetries $A_{UT}$ at the future Electron-Ion Collider (EIC), and find that $A_{UT}$ associated with the $\sin (\phi_h-\phi_S)$, $\sin \phi_S$ and $\sin (2\phi_h-\phi_S)$ harmonics can reach up to 1-2\% even at the top EIC energy.
|
1810.00541
|
Run-Hui Li
|
Li-Juan Jiang, Bei He, Run-Hui Li
|
Weak Decays of Doubly Heavy Baryons: ${\cal B}_{cc}\to {\cal B}_c V$
|
29 pages, 5 figures, 7 tables; version published in EPJC
| null |
10.1140/epjc/s10052-018-6445-1
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The weak decays of a spin-$1/2$ doubly charm baryon (${\cal B}_{cc}$) to a
spin-$1/2$ singly charm baryon (${\cal B}_c$) and a light vector meson ($V$)
are studied under a phenomenological scheme. The contributions are classified
into different topological diagrams, among which the short distance ones are
calculated under the factorization hypothesis, and the long distance
contributions are modelled as final-state interactions (FSIs) which are
estimated with the one-particle-exchange model. In calculation the topological
contributions tend to fall in a hierarchy. The branching fractions or decay
widths are estimated, and it indicates that $\Xi_{cc}^+\to\Xi_c^+\pi^+\pi^-$
and $\Omega_{cc}^{+}\rightarrow\Xi_{c}^{+}K^-\pi^+$ can be used as candidate
decays for searching $\Xi_{cc}^+$ and $\Omega_{cc}^+$. Some decays that are
mainly activated by the long distance effects are found, observation on which
in future experiments can help to understand the role of FSIs in charm baryon
decays.
|
[
{
"created": "Mon, 1 Oct 2018 06:18:32 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Nov 2018 01:08:08 GMT",
"version": "v2"
}
] |
2018-11-26
|
[
[
"Jiang",
"Li-Juan",
""
],
[
"He",
"Bei",
""
],
[
"Li",
"Run-Hui",
""
]
] |
The weak decays of a spin-$1/2$ doubly charm baryon (${\cal B}_{cc}$) to a spin-$1/2$ singly charm baryon (${\cal B}_c$) and a light vector meson ($V$) are studied under a phenomenological scheme. The contributions are classified into different topological diagrams, among which the short distance ones are calculated under the factorization hypothesis, and the long distance contributions are modelled as final-state interactions (FSIs) which are estimated with the one-particle-exchange model. In calculation the topological contributions tend to fall in a hierarchy. The branching fractions or decay widths are estimated, and it indicates that $\Xi_{cc}^+\to\Xi_c^+\pi^+\pi^-$ and $\Omega_{cc}^{+}\rightarrow\Xi_{c}^{+}K^-\pi^+$ can be used as candidate decays for searching $\Xi_{cc}^+$ and $\Omega_{cc}^+$. Some decays that are mainly activated by the long distance effects are found, observation on which in future experiments can help to understand the role of FSIs in charm baryon decays.
|
1410.7475
|
Tom Melia
|
Michelangelo Mangano and Tom Melia
|
Rare exclusive hadronic W decays in a t-tbar environment
|
9 pages, 7 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The large cross section for t-tbar production at the LHC and at any future
hadron collider provides a high-statistics and relatively clean environment for
a study of W boson properties: after tagging on a leptonic decay of one of the
Ws and the two b-jets, an additional W still remains in the event. We study the
prospect of making the first exclusive hadronic decay of a fundamental boson of
the standard model, using the decay modes W to pi gamma and W to pi pi pi, and
other related decays. By using strong isolation criteria, which we impose by
searching for jets with a single particle constituent, we show that the three
particle hadronic W decays have potential to be measured at the LHC. The
possibility of measuring an involved spectrum of decay products could
considerably expand our knowledge of how the W decays, and experimental
techniques acquired in making these measurements would be useful for
application to future measurements of exclusive hadronic Higgs boson decays.
|
[
{
"created": "Tue, 28 Oct 2014 00:54:15 GMT",
"version": "v1"
}
] |
2014-10-29
|
[
[
"Mangano",
"Michelangelo",
""
],
[
"Melia",
"Tom",
""
]
] |
The large cross section for t-tbar production at the LHC and at any future hadron collider provides a high-statistics and relatively clean environment for a study of W boson properties: after tagging on a leptonic decay of one of the Ws and the two b-jets, an additional W still remains in the event. We study the prospect of making the first exclusive hadronic decay of a fundamental boson of the standard model, using the decay modes W to pi gamma and W to pi pi pi, and other related decays. By using strong isolation criteria, which we impose by searching for jets with a single particle constituent, we show that the three particle hadronic W decays have potential to be measured at the LHC. The possibility of measuring an involved spectrum of decay products could considerably expand our knowledge of how the W decays, and experimental techniques acquired in making these measurements would be useful for application to future measurements of exclusive hadronic Higgs boson decays.
|
hep-ph/9912500
| null |
M. Wakamatsu and T. Watabe
|
Spin and Orbital Angular Momentum Distribution Functions of the Nucleon
|
16 pages, latex, 3 eps figures, the revised version to appear in
Physical Review D
|
Phys.Rev. D62 (2000) 054009
|
10.1103/PhysRevD.62.054009
|
OU-HEP-338
|
hep-ph
| null |
A theoretical prediction is given for the spin and orbital angular momentum
distribution functions of the nucleon within the framework of an effective
quark model of QCD, i.e. the chiral quark soliton model. An outstanding feature
of the model is that it predicts fairly small quark spin fraction of the
nucleon $\Delta \Sigma \simeq 0.35$, which in turn dictates that the remaining
65% of the nucleon spin is carried by the orbital angular momentum of quarks
and antiquarks at the model energy scale of $Q^2 \simeq 0.3 {GeV}^2$. This
large orbital angular momentum necessarily affects the scenario of scale
dependence of the nucleon spin contents in a drastic way.
|
[
{
"created": "Fri, 24 Dec 1999 07:44:56 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Dec 1999 02:02:48 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Apr 2000 06:27:35 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Wakamatsu",
"M.",
""
],
[
"Watabe",
"T.",
""
]
] |
A theoretical prediction is given for the spin and orbital angular momentum distribution functions of the nucleon within the framework of an effective quark model of QCD, i.e. the chiral quark soliton model. An outstanding feature of the model is that it predicts fairly small quark spin fraction of the nucleon $\Delta \Sigma \simeq 0.35$, which in turn dictates that the remaining 65% of the nucleon spin is carried by the orbital angular momentum of quarks and antiquarks at the model energy scale of $Q^2 \simeq 0.3 {GeV}^2$. This large orbital angular momentum necessarily affects the scenario of scale dependence of the nucleon spin contents in a drastic way.
|
2311.09621
|
Gong-Ming Yu
|
Gongming Yu, Xinyu Li, Xinghang Zhang, Zhongxia Zhao, Haitao Yang
|
Production of dileptons in ultra-peripheral heavy ion collisions with
two-photon processes
|
11 pages, 6 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the photoproduction process of dileptons in heavy ion collision at
Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energys.
The equivalent photon approximation, which equates the electromagnetic field of
high-energy charged particles to the virtual photon flux, is used to calculate
the processes of dileptons production. The numerical results demonstrate that
the experimental study of dileptons in ultra-peripheral collisions is feasible
at RHIC and LHC energies.
|
[
{
"created": "Thu, 16 Nov 2023 07:05:25 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2024 07:39:27 GMT",
"version": "v2"
}
] |
2024-04-16
|
[
[
"Yu",
"Gongming",
""
],
[
"Li",
"Xinyu",
""
],
[
"Zhang",
"Xinghang",
""
],
[
"Zhao",
"Zhongxia",
""
],
[
"Yang",
"Haitao",
""
]
] |
We study the photoproduction process of dileptons in heavy ion collision at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energys. The equivalent photon approximation, which equates the electromagnetic field of high-energy charged particles to the virtual photon flux, is used to calculate the processes of dileptons production. The numerical results demonstrate that the experimental study of dileptons in ultra-peripheral collisions is feasible at RHIC and LHC energies.
|
hep-ph/0205043
|
Adriano Doff Sotta Gomes
|
A. Doff, A. A. Natale
|
Energy criterion to select the behavior of dynamical masses in
technicolor models
|
4 pages, 3 figures; to appear in Phys. Lett. B
|
Phys.Lett. B537 (2002) 275-279
|
10.1016/S0370-2693(02)01906-8
| null |
hep-ph
| null |
We propose a quite general ansatz for the dynamical mass in technicolor
models. We impose on this ansatz the condition for formation of the tightest
composite boson state, or the criterion that it should lead to the deepest
minimum of energy. This criterion indicates a particular form of the
technifermion self energy.
|
[
{
"created": "Sun, 5 May 2002 17:49:00 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Doff",
"A.",
""
],
[
"Natale",
"A. A.",
""
]
] |
We propose a quite general ansatz for the dynamical mass in technicolor models. We impose on this ansatz the condition for formation of the tightest composite boson state, or the criterion that it should lead to the deepest minimum of energy. This criterion indicates a particular form of the technifermion self energy.
|
1808.02597
|
Shu-Min Zhao
|
Tao Guo, Shu-Min Zhao, Xing-Xing Dong, Chun-Gui Duan, Tai-Fu Feng
|
Muon conversion to electron in nuclei within the BLMSSM
|
20pages, 10figures
| null |
10.1140/epjc/s10052-018-6413-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a supersymmetric extension of the standard model with local gauged baryon
and lepton numbers (BLMSSM), there are new sources for lepton flavor violation,
because the right-handed neutrinos, new gauginos and Higgs are introduced. We
investigate muon conversion to electron in nuclei within the BLMSSM in detail.
The numerical results indicate that the $\mu \rightarrow e $ conversion rates
in nuclei within the BLMSSM can reach the experimental upper bound, which may
be detected in the future experiments.
|
[
{
"created": "Wed, 8 Aug 2018 01:56:29 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Oct 2018 07:18:04 GMT",
"version": "v2"
}
] |
2018-12-05
|
[
[
"Guo",
"Tao",
""
],
[
"Zhao",
"Shu-Min",
""
],
[
"Dong",
"Xing-Xing",
""
],
[
"Duan",
"Chun-Gui",
""
],
[
"Feng",
"Tai-Fu",
""
]
] |
In a supersymmetric extension of the standard model with local gauged baryon and lepton numbers (BLMSSM), there are new sources for lepton flavor violation, because the right-handed neutrinos, new gauginos and Higgs are introduced. We investigate muon conversion to electron in nuclei within the BLMSSM in detail. The numerical results indicate that the $\mu \rightarrow e $ conversion rates in nuclei within the BLMSSM can reach the experimental upper bound, which may be detected in the future experiments.
|
hep-ph/0702249
|
C. Q. Geng
|
C.Q. Geng, Y.K. Hsiao and J.N. Ng
|
Study of $B\to p\bar{p}K^*$ and $B\to p\bar{p}\rho$
|
13 pages, one figure, version to be published in PRD
|
Phys.Rev.D75:094013,2007
|
10.1103/PhysRevD.75.094013
| null |
hep-ph
| null |
We study the three-body baryonic B decays of $B\to p\bar{p}(K^{*},\rho)$ in
the standard model. The baryonic matrix elements are calculated in terms of the
SU(3) flavor symmetry and the QCD power counting rules within the the
perturbative QCD. We find that the decay branching ratios, angular and direct
CP asymmetries of ($B^{-}\to p\bar{p}K^{*-}, \bar{B}^{0}\to p\bar{p}K^{*0},
B^{-}\to p\bar{p}\rho^{-}$) are around $(6,1,30)\times 10^{-6}$, $(13,-27,11)%$
and $(22,1,-3)%$, which are consistent with the current BaBar and Belle data,
respectively. The large values of the branching ratio in $B^{-}\to
p\bar{p}\rho^{-}$ and the direct CP asymmetry in $B^{\pm}\to p\bar{p}K^{*\pm}$
are useful to test the standard model and search for new physics.
|
[
{
"created": "Mon, 26 Feb 2007 17:52:03 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Apr 2007 15:40:03 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Geng",
"C. Q.",
""
],
[
"Hsiao",
"Y. K.",
""
],
[
"Ng",
"J. N.",
""
]
] |
We study the three-body baryonic B decays of $B\to p\bar{p}(K^{*},\rho)$ in the standard model. The baryonic matrix elements are calculated in terms of the SU(3) flavor symmetry and the QCD power counting rules within the the perturbative QCD. We find that the decay branching ratios, angular and direct CP asymmetries of ($B^{-}\to p\bar{p}K^{*-}, \bar{B}^{0}\to p\bar{p}K^{*0}, B^{-}\to p\bar{p}\rho^{-}$) are around $(6,1,30)\times 10^{-6}$, $(13,-27,11)%$ and $(22,1,-3)%$, which are consistent with the current BaBar and Belle data, respectively. The large values of the branching ratio in $B^{-}\to p\bar{p}\rho^{-}$ and the direct CP asymmetry in $B^{\pm}\to p\bar{p}K^{*\pm}$ are useful to test the standard model and search for new physics.
|
1810.03891
|
Harri Waltari
|
Arindam Chatterjee, Mariana Frank, Benjamin Fuks, Katri Huitu,
Subhadeep Mondal, Santosh Kumar Rai and Harri Waltari
|
Multileptonic signals of co-annihilating left-right supersymmetric dark
matter
|
20 pages, 4 figures, revised version
|
Phys. Rev. D 99, 035017 (2019)
|
10.1103/PhysRevD.99.035017
|
CUMQ/HEP 198, HIP-2018-20-TH, HRI-RECAPP-2018-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a comprehensive dark matter analysis of left-right supersymmetric
scenarios that includes constraints from dark matter direct and indirect
detection experiments and that presents distinctive features from those
available in minimal supersymmetry. We concentrate on dark matter candidates
which, while satisfying all constraints, are different from those of the
minimal supersymmetric standard model. We consider in our analysis all possible
co-annihilation channels relevant for setups in which several states are light
and nearly degenerate, and devise a set of representative benchmark points,
requiring co-annihilations, which satisfy all restrictions. We then study their
consequent LHC signals, which exhibit promising new multileptonic signatures
involving $W_R$, that if observed, would provide a strong support for
left-right supersymmetry.
|
[
{
"created": "Tue, 9 Oct 2018 10:19:29 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2019 15:28:45 GMT",
"version": "v2"
}
] |
2019-02-20
|
[
[
"Chatterjee",
"Arindam",
""
],
[
"Frank",
"Mariana",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Huitu",
"Katri",
""
],
[
"Mondal",
"Subhadeep",
""
],
[
"Rai",
"Santosh Kumar",
""
],
[
"Waltari",
"Harri",
""
]
] |
We perform a comprehensive dark matter analysis of left-right supersymmetric scenarios that includes constraints from dark matter direct and indirect detection experiments and that presents distinctive features from those available in minimal supersymmetry. We concentrate on dark matter candidates which, while satisfying all constraints, are different from those of the minimal supersymmetric standard model. We consider in our analysis all possible co-annihilation channels relevant for setups in which several states are light and nearly degenerate, and devise a set of representative benchmark points, requiring co-annihilations, which satisfy all restrictions. We then study their consequent LHC signals, which exhibit promising new multileptonic signatures involving $W_R$, that if observed, would provide a strong support for left-right supersymmetry.
|
hep-ph/0605186
|
Eligio Lisi
|
G.L. Fogli, E. Lisi, A. Marrone, A. Palazzo (U. of Bari & INFN, Bari)
|
Solar Neutrinos (with a tribute to John. N. Bahcall)
|
12 pages, inclusing 9 figures. Presented by G.L. Fogli at 3rd
International Workshop on NO-VE: Neutrino Oscillations in Venice: 50 Years
after the Neutrino Experimental Discovery, Venice, Italy, 7-10 Feb 2006
| null | null | null |
hep-ph astro-ph hep-ex nucl-ex
| null |
John N. Bahcall championed solar neutrino physics for many years. Thanks to
his pioneering and long-lasting contributions, this field of research has not
only reached maturity, but has also opened a new window on physics beyond the
standard electroweak model through the phenomenon of neutrino flavor
oscillations. We briefly outline some recent accomplishments in the field, and
also discuss a couple of issues that do not seem to fit in the ``standard
picture,'' namely, the chemical controversy at the solar surface, and possible
implications of recent gallium radioactive source experiments.
|
[
{
"created": "Tue, 16 May 2006 13:08:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Fogli",
"G. L.",
"",
"U. of Bari & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"U. of Bari & INFN, Bari"
],
[
"Marrone",
"A.",
"",
"U. of Bari & INFN, Bari"
],
[
"Palazzo",
"A.",
"",
"U. of Bari & INFN, Bari"
]
] |
John N. Bahcall championed solar neutrino physics for many years. Thanks to his pioneering and long-lasting contributions, this field of research has not only reached maturity, but has also opened a new window on physics beyond the standard electroweak model through the phenomenon of neutrino flavor oscillations. We briefly outline some recent accomplishments in the field, and also discuss a couple of issues that do not seem to fit in the ``standard picture,'' namely, the chemical controversy at the solar surface, and possible implications of recent gallium radioactive source experiments.
|
1910.04163
|
Jacob Leedom
|
Keisuke Harigaya and Jacob M. Leedom
|
QCD Axion Dark Matter from a Late Time Phase Transition
|
v2: 18 pages, 4 figures
| null |
10.1007/JHEP06(2020)034
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility that the Peccei-Quinn phase transition occurs
at a temperature far below the symmetry breaking scale. Low phase transition
temperatures are typical in supersymmetric theories, where symmetry breaking
fields have small masses. We find that QCD axions are abundantly produced just
after the phase transition. The observed dark matter abundance is reproduced
even if the decay constant is much lower than $10^{11}$ GeV. The produced
axions tend to be warm. For some range of the decay constant, the effect of the
predicted warmness on structure formation can be confirmed by future
observations of 21 cm lines. A portion of parameter space requires a mixing
between the Peccei-Quinn symmetry breaking field and the Standard Model Higgs,
and predicts an observable rate of rare Kaon decays.
|
[
{
"created": "Wed, 9 Oct 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2020 17:37:00 GMT",
"version": "v2"
}
] |
2020-06-19
|
[
[
"Harigaya",
"Keisuke",
""
],
[
"Leedom",
"Jacob M.",
""
]
] |
We investigate the possibility that the Peccei-Quinn phase transition occurs at a temperature far below the symmetry breaking scale. Low phase transition temperatures are typical in supersymmetric theories, where symmetry breaking fields have small masses. We find that QCD axions are abundantly produced just after the phase transition. The observed dark matter abundance is reproduced even if the decay constant is much lower than $10^{11}$ GeV. The produced axions tend to be warm. For some range of the decay constant, the effect of the predicted warmness on structure formation can be confirmed by future observations of 21 cm lines. A portion of parameter space requires a mixing between the Peccei-Quinn symmetry breaking field and the Standard Model Higgs, and predicts an observable rate of rare Kaon decays.
|
1812.08623
|
Shoaib Munir
|
Rikard Enberg, William Klemm, Stefano Moretti, Shoaib Munir
|
Signatures of the Type-I 2HDM at the LHC
|
14 pages, 6 figures, 4 tables; Proceedings of the Corfu Summer
Institute 2018 "School and Workshops on Elementary Particle Physics and
Gravity" (CORFU2018)
| null | null |
KIAS-P18116
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the simplest extensions of the Standard Model (SM) is the
two-Higgs-doublet model (2HDM), which contains two neutral Higgs bosons, in
addition to a 125 GeV one, and a charged pair. At the Large Hadron Collider
(LHC), gluon-induced processes are generally the most important modes for the
resonant production of the SM-like Higgs boson as well as its pair-production,
and it is generally considered to be the case also for an additional neutral
Higgs boson possibly existing in nature. We show that for certain parameter
configurations in the Type-I 2HDM, electroweak pair-production of the neutral
Higgs states can dominate over the QCD-initiated production. Moreover, it is
possible for the pair-production of the charged Higgs state along with a
neutral one, which can only take place electroweakly, to have a substantial
cross section. We delineate such 2HDM parameter space regions through its
comprehensive numerical scanning, requiring their consistency with the most
relevant theoretical and experimental constraints. We also highlight some
specific di-Higgs signatures that can be probed at the LHC in order to
establish the Type-I 2HDM as the underlying new physics model.
|
[
{
"created": "Thu, 20 Dec 2018 15:03:28 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Dec 2018 12:55:37 GMT",
"version": "v2"
}
] |
2019-01-01
|
[
[
"Enberg",
"Rikard",
""
],
[
"Klemm",
"William",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
]
] |
One of the simplest extensions of the Standard Model (SM) is the two-Higgs-doublet model (2HDM), which contains two neutral Higgs bosons, in addition to a 125 GeV one, and a charged pair. At the Large Hadron Collider (LHC), gluon-induced processes are generally the most important modes for the resonant production of the SM-like Higgs boson as well as its pair-production, and it is generally considered to be the case also for an additional neutral Higgs boson possibly existing in nature. We show that for certain parameter configurations in the Type-I 2HDM, electroweak pair-production of the neutral Higgs states can dominate over the QCD-initiated production. Moreover, it is possible for the pair-production of the charged Higgs state along with a neutral one, which can only take place electroweakly, to have a substantial cross section. We delineate such 2HDM parameter space regions through its comprehensive numerical scanning, requiring their consistency with the most relevant theoretical and experimental constraints. We also highlight some specific di-Higgs signatures that can be probed at the LHC in order to establish the Type-I 2HDM as the underlying new physics model.
|
1607.06741
|
Miguel Crispim Rom\~ao
|
Bobby S. Acharya, Krzysztof Bozek, Miguel Crispim Rom\~ao, Stephen F.
King, Chakrit Pongkitivanichkul
|
Neutrino mass from M Theory SO(10)
|
32 pages, 12 figures
| null |
10.1007/JHEP11(2016)173
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the origin of neutrino mass from $SO(10)$ arising from $M$ Theory
compactified on a $G_2$-manifold. This is linked to the problem of the breaking
of the extra $U(1)$ gauge group, in the $SU(5)\times U(1)$ subgroup of
$SO(10)$, which we show can achieved via a (generalised) Kolda-Martin
mechanism. The resulting neutrino masses arise from a combination of the seesaw
mechanism and induced R-parity breaking contributions. The rather complicated
neutrino mass matrix is analysed for one neutrino family and it is shown how
phenomenologically acceptable neutrino masses can emerge.
|
[
{
"created": "Fri, 22 Jul 2016 16:47:35 GMT",
"version": "v1"
}
] |
2016-12-21
|
[
[
"Acharya",
"Bobby S.",
""
],
[
"Bozek",
"Krzysztof",
""
],
[
"Romão",
"Miguel Crispim",
""
],
[
"King",
"Stephen F.",
""
],
[
"Pongkitivanichkul",
"Chakrit",
""
]
] |
We study the origin of neutrino mass from $SO(10)$ arising from $M$ Theory compactified on a $G_2$-manifold. This is linked to the problem of the breaking of the extra $U(1)$ gauge group, in the $SU(5)\times U(1)$ subgroup of $SO(10)$, which we show can achieved via a (generalised) Kolda-Martin mechanism. The resulting neutrino masses arise from a combination of the seesaw mechanism and induced R-parity breaking contributions. The rather complicated neutrino mass matrix is analysed for one neutrino family and it is shown how phenomenologically acceptable neutrino masses can emerge.
|
hep-ph/9611242
|
Elena Boglione
|
M.R. Pennington
|
Calculating hadronic properties in strong QCD
|
6 Latex pages, 5 figures
| null | null | null |
hep-ph
| null |
This talk, given at the Second Workshop on ELFE Physics, St Malo, France,
September 1996, presents a brief review of the progress that has been made in
calculating the properties of hadrons in strong QCD.
|
[
{
"created": "Tue, 5 Nov 1996 18:40:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pennington",
"M. R.",
""
]
] |
This talk, given at the Second Workshop on ELFE Physics, St Malo, France, September 1996, presents a brief review of the progress that has been made in calculating the properties of hadrons in strong QCD.
|
1003.3819
|
Covi Laura
|
L. Covi
|
Gravitino Dark Matter and the ILC
|
5 pages, no figures. Contribution to the Proceedings of LC09,
Perugia, 21-24 September 2009.
| null |
10.1393/ncc/i2010-10602-5
|
DESY 10-038
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the case of gravitino Dark Matter for stop, neutralino and
sneutrino Next-to-Lightest Supersymmetric Particles and discuss prospects to
investigate such scenarios at LHC and a Linear Collider.
|
[
{
"created": "Fri, 19 Mar 2010 15:45:26 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Covi",
"L.",
""
]
] |
We review the case of gravitino Dark Matter for stop, neutralino and sneutrino Next-to-Lightest Supersymmetric Particles and discuss prospects to investigate such scenarios at LHC and a Linear Collider.
|
1311.6058
|
Bodo Lampe
|
Bodo Lampe
|
A microscopic Interpretation of the SM Higgs Mechanism
|
24 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A model is presented where the Higgs mechanism of the Standard Model is
deduced from the alignment of a strongly correlated fermion system in an
internal space with $A_4$ symmetry. The ground state is constructed and its
energy calculated. Finally, it is claimed that the model may be derived from a
field theory in 6+1 dimensions.
|
[
{
"created": "Sat, 23 Nov 2013 21:55:17 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Dec 2013 11:39:41 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jan 2015 15:17:50 GMT",
"version": "v3"
}
] |
2015-01-27
|
[
[
"Lampe",
"Bodo",
""
]
] |
A model is presented where the Higgs mechanism of the Standard Model is deduced from the alignment of a strongly correlated fermion system in an internal space with $A_4$ symmetry. The ground state is constructed and its energy calculated. Finally, it is claimed that the model may be derived from a field theory in 6+1 dimensions.
|
hep-ph/0606272
|
Leszek Motyka
|
H. Kowalski, L. Motyka and G. Watt
|
Exclusive diffractive processes at HERA within the dipole picture
|
48 pages, 28 figures, the final version to appear in Physical Review
D
|
Phys.Rev.D74:074016,2006
|
10.1103/PhysRevD.74.074016
|
DESY 06-095
|
hep-ph
| null |
We present a simultaneous analysis, within an impact parameter dependent
saturated dipole model, of exclusive diffractive vector meson (J/psi, phi and
rho) production, deeply virtual Compton scattering and the total gamma* p cross
section data measured at HERA. Various cross sections measured as a function of
the kinematic variables Q^2, W and t are well described, with little
sensitivity to the details of the vector meson wave functions. We determine the
properties of the gluon density in the proton in both longitudinal and
transverse dimensions, including the impact parameter dependent saturation
scale. The overall success of the description indicates universality of the
emerging gluon distribution and proton shape.
|
[
{
"created": "Tue, 27 Jun 2006 09:00:19 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Sep 2006 11:47:31 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Kowalski",
"H.",
""
],
[
"Motyka",
"L.",
""
],
[
"Watt",
"G.",
""
]
] |
We present a simultaneous analysis, within an impact parameter dependent saturated dipole model, of exclusive diffractive vector meson (J/psi, phi and rho) production, deeply virtual Compton scattering and the total gamma* p cross section data measured at HERA. Various cross sections measured as a function of the kinematic variables Q^2, W and t are well described, with little sensitivity to the details of the vector meson wave functions. We determine the properties of the gluon density in the proton in both longitudinal and transverse dimensions, including the impact parameter dependent saturation scale. The overall success of the description indicates universality of the emerging gluon distribution and proton shape.
|
2309.16615
|
Kalle Ala-Mattinen
|
Kalle Ala-Mattinen, Matti Heikinheimo, Kimmo Kainulainen, Kimmo
Tuominen
|
Anatomy of real intermediate state-subtraction scheme
|
9 pages, 8 figures; Accepted for publication in Phys. Rev. D
| null | null |
HIP-2023-14/TH
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We study the origin of the real intermediate state subtraction problem and
compare its different solutions. We show that the ambiguity in subtraction
schemes arises from the on-shell approximation for the 2-point functions that
reduces the Schwinger-Dyson equations to the Boltzmann limit. We also suggest a
new subtraction scheme which, unlike the earlier definitions, never leads to
negative scattering rates. This scheme also quantifies the validity of the
on-shell limit in terms of an effective one-particle weight function $R(\Delta
)$, where $\Delta$ measures the region around the resonance associated with the
real state.
|
[
{
"created": "Thu, 28 Sep 2023 17:14:11 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2023 21:20:03 GMT",
"version": "v2"
}
] |
2023-11-21
|
[
[
"Ala-Mattinen",
"Kalle",
""
],
[
"Heikinheimo",
"Matti",
""
],
[
"Kainulainen",
"Kimmo",
""
],
[
"Tuominen",
"Kimmo",
""
]
] |
We study the origin of the real intermediate state subtraction problem and compare its different solutions. We show that the ambiguity in subtraction schemes arises from the on-shell approximation for the 2-point functions that reduces the Schwinger-Dyson equations to the Boltzmann limit. We also suggest a new subtraction scheme which, unlike the earlier definitions, never leads to negative scattering rates. This scheme also quantifies the validity of the on-shell limit in terms of an effective one-particle weight function $R(\Delta )$, where $\Delta$ measures the region around the resonance associated with the real state.
|
2207.04215
|
Etido Inyang
|
E. P.Inyang, J. E.Ntibi, E. A. Ibanga, and E. S.William
|
Applicability of Hulthen-Hellmann potential to predict the mass-spectra
of heavy mesons via series expansion method
|
12 Pages,2tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We adopt Hulth\'en plus Hellmann potential as the quark-antiquark interaction
potential for predicting the mass spectra of heavy mesons. The adopted
potential was made to be temperature-dependent by replacing the screening
parameter with Debye mass.The radial Schr\"odinger equation was analytically
solved using the series expansion method and energy eigenvalues were obtained.
The energy eigenvalues is used to predict the mass spectra of heavy mesons such
as charmonium and bottomonium. Four special cases were considered when some of
the potential parameters were set to zero, resulting in Hellmann potential,
Yukawa potential, Coulomb potential, and Hulth\'en potential, respectively. The
present potential provides satisfying results in comparison with experimental
data and the work of other researchers with a maximum error of 0.034 GeV.
|
[
{
"created": "Sat, 9 Jul 2022 07:36:23 GMT",
"version": "v1"
}
] |
2022-07-12
|
[
[
"Inyang",
"E. P.",
""
],
[
"Ntibi",
"J. E.",
""
],
[
"Ibanga",
"E. A.",
""
],
[
"William",
"E. S.",
""
]
] |
We adopt Hulth\'en plus Hellmann potential as the quark-antiquark interaction potential for predicting the mass spectra of heavy mesons. The adopted potential was made to be temperature-dependent by replacing the screening parameter with Debye mass.The radial Schr\"odinger equation was analytically solved using the series expansion method and energy eigenvalues were obtained. The energy eigenvalues is used to predict the mass spectra of heavy mesons such as charmonium and bottomonium. Four special cases were considered when some of the potential parameters were set to zero, resulting in Hellmann potential, Yukawa potential, Coulomb potential, and Hulth\'en potential, respectively. The present potential provides satisfying results in comparison with experimental data and the work of other researchers with a maximum error of 0.034 GeV.
|
hep-ph/9311261
|
Helene Veltman
|
H. Veltman
|
Testing the Higgs system at a photon-photon collider
|
29 pages, report T93/111
|
Z.Phys. C62 (1994) 235-252
|
10.1007/BF01560240
| null |
hep-ph
| null |
The level of sensitivity of the processes $\gamma\gamma \to ZZ$,
$\gamma\gamma \to W^+W^-$ and $\gamma\gamma \to t\bar t$ to the Higgs sector of
the Standard Model Lagrangian in the energy region between 200 GeV and 1 TeV is
examined. The elementary Higgs boson is taken to have a mass less than 1 TeV.
Sizeable effects are found in the $ZZ$ and $t\bar t$ channels if the incoming
photons have the same helicity. Also the possibility that the elementary Higgs
boson does not exist is examined. Assuming new physics to show up in the TeV
energy region the cross sections are evaluated according to the heavy Higgs
model. For center of mass energy values close to 1 TeV interesting effects are
found in the $t\bar t$ channel if the photons have the same helicity. The limit
of large Higgs mass is not unique. The parametrization of this arbitrariness
may be interpreted as a representation of the new physics. The effects for the
processes $\gamma\gamma\to ZZ$ and $\gamma\gamma\to t\bar t$ are investigated.
These effects may be correlated to a possible resonance in $WW$ scattering in
the TeV region.
|
[
{
"created": "Wed, 10 Nov 1993 14:25:39 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Veltman",
"H.",
""
]
] |
The level of sensitivity of the processes $\gamma\gamma \to ZZ$, $\gamma\gamma \to W^+W^-$ and $\gamma\gamma \to t\bar t$ to the Higgs sector of the Standard Model Lagrangian in the energy region between 200 GeV and 1 TeV is examined. The elementary Higgs boson is taken to have a mass less than 1 TeV. Sizeable effects are found in the $ZZ$ and $t\bar t$ channels if the incoming photons have the same helicity. Also the possibility that the elementary Higgs boson does not exist is examined. Assuming new physics to show up in the TeV energy region the cross sections are evaluated according to the heavy Higgs model. For center of mass energy values close to 1 TeV interesting effects are found in the $t\bar t$ channel if the photons have the same helicity. The limit of large Higgs mass is not unique. The parametrization of this arbitrariness may be interpreted as a representation of the new physics. The effects for the processes $\gamma\gamma\to ZZ$ and $\gamma\gamma\to t\bar t$ are investigated. These effects may be correlated to a possible resonance in $WW$ scattering in the TeV region.
|
1304.6051
|
Holger Frits Bech Nielsen
|
H. B. Nielsen
|
Dimension Four Wins the Same Game as the Standard Model Group
|
After introducing some more review o the previous article the
historical stuff was moved into an appendix
|
Phys. Rev. D 88, 096001 (2013)
|
10.1103/PhysRevD.88.096001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a previous article Don Bennett and I looked for,found and proposed a game
in which the Standard Model group S(U(2)XU(3)) gets singled out as the
"winner". Here I propose to extend this "game" to construct a corresponding
game between different potential dimensions for space time. The idea is to
formulate how the same competition as the one between the potential gauge
groups would run out, if restricted to the potential Lorentz or Poincare groups
achievable for different dimensions of space time d. The remarkable point is
that it is the experimental dimension of space time 4 which wins. So the same
function defined over Lie groups seems to single out both the gauge group and
the space time dimension in nature. This seems a rather strange coincidence
unless there is really some similar physics behind.
|
[
{
"created": "Mon, 22 Apr 2013 18:38:34 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2013 17:57:18 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jun 2013 10:06:22 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Jun 2013 17:05:19 GMT",
"version": "v4"
},
{
"created": "Fri, 21 Jun 2013 19:07:04 GMT",
"version": "v5"
},
{
"created": "Mon, 24 Jun 2013 15:45:53 GMT",
"version": "v6"
},
{
"created": "Tue, 17 Sep 2013 14:49:18 GMT",
"version": "v7"
}
] |
2013-11-13
|
[
[
"Nielsen",
"H. B.",
""
]
] |
In a previous article Don Bennett and I looked for,found and proposed a game in which the Standard Model group S(U(2)XU(3)) gets singled out as the "winner". Here I propose to extend this "game" to construct a corresponding game between different potential dimensions for space time. The idea is to formulate how the same competition as the one between the potential gauge groups would run out, if restricted to the potential Lorentz or Poincare groups achievable for different dimensions of space time d. The remarkable point is that it is the experimental dimension of space time 4 which wins. So the same function defined over Lie groups seems to single out both the gauge group and the space time dimension in nature. This seems a rather strange coincidence unless there is really some similar physics behind.
|
hep-ph/0607128
|
Werner Sauter
|
M. B. Gay Ducati and W. K. Sauter
|
Gluon propagator in diffractive scattering
|
14 pages, 4 figures, accepted for publication in Int. J. Mod. Phys. A
(uses ws-ijmpa.cls). Authors corrected
|
Int.J.Mod.Phys. A21 (2006) 5861-5874
|
10.1142/S0217751X06033945
| null |
hep-ph
| null |
In this work, we perform a comparison of the employ of distinct gluon
propagators with the experimental data in diffractive processes, $pp$ elastic
scattering and light meson photo-production. The gluon propagators are
calculated through non-perturbative methods, being justified their use in this
class of events, due to the smallness of the momentum transfer. Our results are
not able to select the best choice for the modified gluon propagator among the
analyzed ones, showing that the application of this procedure in this class of
high energy processes, although giving a reasonable fit to the experimental
data, should be taken with same caution.
|
[
{
"created": "Tue, 11 Jul 2006 18:43:21 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2006 12:37:29 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Ducati",
"M. B. Gay",
""
],
[
"Sauter",
"W. K.",
""
]
] |
In this work, we perform a comparison of the employ of distinct gluon propagators with the experimental data in diffractive processes, $pp$ elastic scattering and light meson photo-production. The gluon propagators are calculated through non-perturbative methods, being justified their use in this class of events, due to the smallness of the momentum transfer. Our results are not able to select the best choice for the modified gluon propagator among the analyzed ones, showing that the application of this procedure in this class of high energy processes, although giving a reasonable fit to the experimental data, should be taken with same caution.
|
hep-ph/0304296
|
Leonid Satarov
|
I.N. Mishustin (1,2,3), L.M. Satarov (1,2), W. Greiner (1) ((1)
Frankfurt Uni., (2) Kurchatov Inst., (3) Niels Bohr Inst.)
|
How far is normal nuclear matter from the chiral symmetry restoration?
|
22 pages, 13 figures, dedicated to S.T. Belyaev on the occasion of
his 80th birthday
|
Phys.Rept. 391 (2004) 363-380
|
10.1016/j.physrep.2003.10.010
| null |
hep-ph nucl-th
| null |
Properties of cold nuclear matter are studied within a generalized
Nambu-Jona-Lasinio model formulated on the level of constituent nucleons. The
model parameters are chosen to reproduce simultaneously the observed nucleon
and pion masses in vacuum as well as saturation properties of nuclear matter.
The strongest constraints on these parameters are given by the empirical values
of the nucleon effective mass and compression modulus at nuclear saturation
density. A preferable value of the cut-off momentum, determining density of
active quasinucleon states in the Dirac sea, is estimated to about 400 MeV/c.
With the most reasonable choice of model parameters we have found a first order
phase transition of the liquid-gas type at subsaturation densities and the
gradual restoration of chiral symmetry at about 3 times the saturation density.
Fluctuations of the scalar condensate around its mean-field value are estimated
and shown to be large in the vicinity of chiral transition.
|
[
{
"created": "Wed, 30 Apr 2003 16:13:09 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Mishustin",
"I. N.",
""
],
[
"Satarov",
"L. M.",
""
],
[
"Greiner",
"W.",
""
]
] |
Properties of cold nuclear matter are studied within a generalized Nambu-Jona-Lasinio model formulated on the level of constituent nucleons. The model parameters are chosen to reproduce simultaneously the observed nucleon and pion masses in vacuum as well as saturation properties of nuclear matter. The strongest constraints on these parameters are given by the empirical values of the nucleon effective mass and compression modulus at nuclear saturation density. A preferable value of the cut-off momentum, determining density of active quasinucleon states in the Dirac sea, is estimated to about 400 MeV/c. With the most reasonable choice of model parameters we have found a first order phase transition of the liquid-gas type at subsaturation densities and the gradual restoration of chiral symmetry at about 3 times the saturation density. Fluctuations of the scalar condensate around its mean-field value are estimated and shown to be large in the vicinity of chiral transition.
|
1802.05722
|
Rahul Srivastava
|
Salvador Centelles Chuli\'a, Rahul Srivastava, Jos\'e W. F. Valle
|
Seesaw roadmap to neutrino mass and dark matter
|
12 pages, 5 figures, published version
|
Phys. Lett. B, 781 (2018) 122-128
|
10.1016/j.physletb.2018.03.046
|
IFIC/18-xxx
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe the many pathways to generate Majorana and Dirac neutrino mass
through generalized dimension-5 operators a la Weinberg. The presence of new
scalars beyond the Standard Model Higgs doublet implies new possible field
contractions, which are required in the case of Dirac neutrinos. We also notice
that, in the Dirac neutrino case, the extra symmetries needed to ensure the
Dirac nature of neutrinos can also be made responsible for stability of dark
matter.
|
[
{
"created": "Thu, 15 Feb 2018 19:00:06 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2018 10:10:25 GMT",
"version": "v2"
}
] |
2018-05-04
|
[
[
"Chuliá",
"Salvador Centelles",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Valle",
"José W. F.",
""
]
] |
We describe the many pathways to generate Majorana and Dirac neutrino mass through generalized dimension-5 operators a la Weinberg. The presence of new scalars beyond the Standard Model Higgs doublet implies new possible field contractions, which are required in the case of Dirac neutrinos. We also notice that, in the Dirac neutrino case, the extra symmetries needed to ensure the Dirac nature of neutrinos can also be made responsible for stability of dark matter.
|
1203.5634
|
Neda Sadooghi
|
N. Sadooghi and F. Taghinavaz
|
Local electric current correlation function in an exponentially decaying
magnetic field
|
V1: 16 pages, 7 figures, 2 tables; V2: Section II improved,
references added. Version accepted for publication in PRD
|
Phys. Rev. D85, 125035 (2012)
|
10.1103/PhysRevD.85.125035
| null |
hep-ph cond-mat.mes-hall hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effect of an exponentially decaying magnetic field on the dynamics of
Dirac fermions in 3+1 dimensions is explored. The spatially decaying magnetic
field is assumed to be aligned in the third direction, and is defined by
{\mathbf{B}}(x)=B(x){\mathbf{e}}_{z}, with B(x)=B_{0}e^{-\xi\ x/\ell_{B}}.
Here, \xi\ is a dimensionless damping factor and \ell_{B}=(eB_{0})^{-1/2} is
the magnetic length. As it turns out, the energy spectrum of fermions in this
inhomogeneous magnetic field can be analytically determined using the Ritus
method. Assuming the magnetic field to be strong, the chiral condensate and the
\textit{local} electric current correlation function are computed in the lowest
Landau level (LLL) approximation and the results are compared with those
arising from a strong homogeneous magnetic field. Although the constant
magnetic field B_{0} can be reproduced by taking the limit of \xi-> 0 and/or
x-> 0 from B(x), these limits turn out to be singular once the quantum
corrections are taken into account.
|
[
{
"created": "Mon, 26 Mar 2012 11:28:47 GMT",
"version": "v1"
},
{
"created": "Mon, 28 May 2012 11:37:00 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Sadooghi",
"N.",
""
],
[
"Taghinavaz",
"F.",
""
]
] |
The effect of an exponentially decaying magnetic field on the dynamics of Dirac fermions in 3+1 dimensions is explored. The spatially decaying magnetic field is assumed to be aligned in the third direction, and is defined by {\mathbf{B}}(x)=B(x){\mathbf{e}}_{z}, with B(x)=B_{0}e^{-\xi\ x/\ell_{B}}. Here, \xi\ is a dimensionless damping factor and \ell_{B}=(eB_{0})^{-1/2} is the magnetic length. As it turns out, the energy spectrum of fermions in this inhomogeneous magnetic field can be analytically determined using the Ritus method. Assuming the magnetic field to be strong, the chiral condensate and the \textit{local} electric current correlation function are computed in the lowest Landau level (LLL) approximation and the results are compared with those arising from a strong homogeneous magnetic field. Although the constant magnetic field B_{0} can be reproduced by taking the limit of \xi-> 0 and/or x-> 0 from B(x), these limits turn out to be singular once the quantum corrections are taken into account.
|
2208.01861
|
Jose Ruiz
|
Alfredo Gurrola, Jos\'e David Ruiz-\'Alvarez
|
Quarkophobic W' for LHC searches
|
FPCP 2022 proceedings
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider a simplified model where a W' boson is added to the standard
model with negligible couplings to quarks, but generic couplings to leptons and
electroweak bosons. We study the implications of such a model for LHC searches.
Consequently, we propose an LHC search through the vector boson fusion topology
which would have sensitivity for such a new particle with the current
proton-proton collisions's energy and available luminosity.
|
[
{
"created": "Wed, 3 Aug 2022 06:13:34 GMT",
"version": "v1"
}
] |
2022-08-04
|
[
[
"Gurrola",
"Alfredo",
""
],
[
"Ruiz-Álvarez",
"José David",
""
]
] |
We consider a simplified model where a W' boson is added to the standard model with negligible couplings to quarks, but generic couplings to leptons and electroweak bosons. We study the implications of such a model for LHC searches. Consequently, we propose an LHC search through the vector boson fusion topology which would have sensitivity for such a new particle with the current proton-proton collisions's energy and available luminosity.
|
2211.10620
|
Sanjib Kumar Agarwalla
|
Sanjib Kumar Agarwalla, Sudipta Das, Alessio Giarnetti, Davide Meloni,
Masoom Singh
|
Enhancing Sensitivity to Leptonic CP Violation using Complementarity
among DUNE, T2HK, and T2HKK
|
32 pages, 11 figures, 4 tables, and one appendix. A new section 5
added with a new figure 10, a new appendix added with a new figure 11, and
more discussions added in the text. This version has the same content as the
published article in The European Physical Journal C
| null | null |
IP/BBSR/2022-08
|
hep-ph hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After the landmark discovery of non-zero $\theta_{13}$ by the modern reactor
experiments, unprecedented precision on neutrino mass-mixing parameters has
been achieved over the past decade. This has set the stage for the discovery of
leptonic CP violation (LCPV) at high confidence level in the next-generation
long-baseline neutrino oscillation experiments. In this work, we explore in
detail the possible complementarity among the on-axis DUNE and off-axis T2HK
experiments to enhance the sensitivity to LCPV suppressing the
$\theta_{23}-\delta_{\mathrm{CP}}$ degeneracy. We find that none of these
experiments individually can achieve the milestone of 3$\sigma$ LCPV for at
least 75% choices of $\delta_{\mathrm{CP}}$ in its entire range of
$[-180^{\circ} , 180^{\circ}]$, with their nominal exposures and systematic
uncertainties. However, their combination can attain the same for all values of
$\theta_{23}$ with only half of their nominal exposures. We observe that the
proposed T2HKK setup in combination with DUNE can further increase the CP
coverage to more than 80% with only half of their nominal exposures. We study
in detail how the coverage in $\delta_{\mathrm{CP}}$ for $\ge$ 3$\sigma$ LCPV
depends on the choice of $\theta_{23}$, exposure, optimal runtime in neutrino
and antineutrino modes, and systematic uncertainties in these experiments in
isolation and combination. We find that with an improved systematic uncertainty
of 2.7% in appearance mode, the standalone T2HK setup can provide a CP coverage
of around 75% for all values of $\theta_{23}$. We also discuss the pivotal role
of intrinsic, extrinsic, and total CP asymmetries in the appearance channel and
extrinsic CP asymmetries in the disappearance channel while analyzing our
results.
|
[
{
"created": "Sat, 19 Nov 2022 08:41:28 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Aug 2023 18:58:28 GMT",
"version": "v2"
}
] |
2023-08-15
|
[
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Das",
"Sudipta",
""
],
[
"Giarnetti",
"Alessio",
""
],
[
"Meloni",
"Davide",
""
],
[
"Singh",
"Masoom",
""
]
] |
After the landmark discovery of non-zero $\theta_{13}$ by the modern reactor experiments, unprecedented precision on neutrino mass-mixing parameters has been achieved over the past decade. This has set the stage for the discovery of leptonic CP violation (LCPV) at high confidence level in the next-generation long-baseline neutrino oscillation experiments. In this work, we explore in detail the possible complementarity among the on-axis DUNE and off-axis T2HK experiments to enhance the sensitivity to LCPV suppressing the $\theta_{23}-\delta_{\mathrm{CP}}$ degeneracy. We find that none of these experiments individually can achieve the milestone of 3$\sigma$ LCPV for at least 75% choices of $\delta_{\mathrm{CP}}$ in its entire range of $[-180^{\circ} , 180^{\circ}]$, with their nominal exposures and systematic uncertainties. However, their combination can attain the same for all values of $\theta_{23}$ with only half of their nominal exposures. We observe that the proposed T2HKK setup in combination with DUNE can further increase the CP coverage to more than 80% with only half of their nominal exposures. We study in detail how the coverage in $\delta_{\mathrm{CP}}$ for $\ge$ 3$\sigma$ LCPV depends on the choice of $\theta_{23}$, exposure, optimal runtime in neutrino and antineutrino modes, and systematic uncertainties in these experiments in isolation and combination. We find that with an improved systematic uncertainty of 2.7% in appearance mode, the standalone T2HK setup can provide a CP coverage of around 75% for all values of $\theta_{23}$. We also discuss the pivotal role of intrinsic, extrinsic, and total CP asymmetries in the appearance channel and extrinsic CP asymmetries in the disappearance channel while analyzing our results.
|
1310.1962
|
Keita Fukushima
|
Keita Fukushima
|
Dipole Moment Bounds on Scalar Dark Matter Annihilation
|
Presentation at the DPF 2013 Meeting of the American Physical Society
Division of Particles and Fields, Santa Cruz, California, August 13-17, 2013
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a scalar dark matter annihilations to light leptons mediated by
charged exotic fermions. The interaction of this model also adds a correction
to dipole moments of light leptons. In the simplified model, these processes
will depend upon the same coupling constants. The tight experimental bounds on
the dipole moments of light leptons will constrain the coupling constants.
Consequently, this bound will then limit the annihilations. We will produce
this dipole moment bounds on the annihilation. From this analysis, we report
that the bound on annihilation to the electrons is $4.0\times10^{-7}\pb$ (g-2)
+ $8.8\times 10^{-15}\pb$ (EDM) and the muons is $5.6\times 10^{-4}\pb$ (g-2) +
$180\pb$ (EDM), in the limit where the mediator is much heavier than dark
matter. The parentheses indicate the dipole moment used to obtain the values.
We note that only the annihilation to muons through a CP-violating (EDM)
coupling is not excluded from indirect detection experiments.
|
[
{
"created": "Mon, 7 Oct 2013 21:57:46 GMT",
"version": "v1"
}
] |
2013-10-09
|
[
[
"Fukushima",
"Keita",
""
]
] |
We consider a scalar dark matter annihilations to light leptons mediated by charged exotic fermions. The interaction of this model also adds a correction to dipole moments of light leptons. In the simplified model, these processes will depend upon the same coupling constants. The tight experimental bounds on the dipole moments of light leptons will constrain the coupling constants. Consequently, this bound will then limit the annihilations. We will produce this dipole moment bounds on the annihilation. From this analysis, we report that the bound on annihilation to the electrons is $4.0\times10^{-7}\pb$ (g-2) + $8.8\times 10^{-15}\pb$ (EDM) and the muons is $5.6\times 10^{-4}\pb$ (g-2) + $180\pb$ (EDM), in the limit where the mediator is much heavier than dark matter. The parentheses indicate the dipole moment used to obtain the values. We note that only the annihilation to muons through a CP-violating (EDM) coupling is not excluded from indirect detection experiments.
|
2211.12960
|
Chia-Wei Liu
|
Chia-Wei Liu and Chao-Qiang Geng
|
Nonleptonic decays of $\Xi_{cc}\to \Xi_c \pi$ with $\Xi_c-\Xi_c'$ mixing
|
17 pages, 1 figure, accepted by Physical Review D
| null |
10.1103/PhysRevD.107.013006
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Aiming on testing the $\Xi_c-\Xi_c'$ mixing, we study the decays of
$\Xi_{cc}\to \Xi_c \pi$ with $\Xi_{cc} = (\Xi_{cc}^{++} , \Xi_{cc} ^+ )$,
$\Xi_c = (\Xi_c^{(\prime)+},\Xi_c^{(\prime)0})$ and $\pi = (\pi^+ , \pi^0)$.
The soft-meson limit is considered along with the pole model, and the baryon
matrix elements are evaluated by the bag model with and without removing the
center-of-mass motion (CMM). We find that the four-quark operator matrix
elements are about twice larger once the unwanted CMM is removed. We obtain
that ${\cal R} = {\cal B}(\Xi_{cc}^+ \to \Xi_c^{\prime +} \pi^+ )/ {\cal
B}(\Xi_{cc}^+ \to \Xi_c^{ +} \pi^+ ) = 0.87^{+0.17}_{-0.11} $ and $1.45$ with
and without removing the CMM, where the former is close to the lower bound and
the later is well consistent with ${\cal R} = 1.41 \pm 0.17 \pm 0.10$ measured
at LHCb. In addition, we show that after including the mixing, the up-down
asymmetry of $\alpha( \Xi_{cc}^+ \to \Xi_c^{(\prime)0 } \pi^+)$ flips sign.
Explicitly, we obtain that $\alpha(\Xi_{cc}^{+} \to \Xi_c^{\prime +} \pi^0) =
0.52$ and $\alpha(\Xi_{cc}^{+} \to \Xi_c^{ 0 } \pi^+) = 0.31$ with and without
the CMM corrections, respectively, which are all negative if the mixing is
absence. As a bonus, a positive value of $\alpha(\Xi_{cc}^{+} \to \Xi_c^{\prime
0} \pi^+)$ in experiments can also serve as the evidence of the $W$-exchange
contributions.
|
[
{
"created": "Wed, 23 Nov 2022 14:06:03 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2023 15:35:14 GMT",
"version": "v2"
}
] |
2023-01-26
|
[
[
"Liu",
"Chia-Wei",
""
],
[
"Geng",
"Chao-Qiang",
""
]
] |
Aiming on testing the $\Xi_c-\Xi_c'$ mixing, we study the decays of $\Xi_{cc}\to \Xi_c \pi$ with $\Xi_{cc} = (\Xi_{cc}^{++} , \Xi_{cc} ^+ )$, $\Xi_c = (\Xi_c^{(\prime)+},\Xi_c^{(\prime)0})$ and $\pi = (\pi^+ , \pi^0)$. The soft-meson limit is considered along with the pole model, and the baryon matrix elements are evaluated by the bag model with and without removing the center-of-mass motion (CMM). We find that the four-quark operator matrix elements are about twice larger once the unwanted CMM is removed. We obtain that ${\cal R} = {\cal B}(\Xi_{cc}^+ \to \Xi_c^{\prime +} \pi^+ )/ {\cal B}(\Xi_{cc}^+ \to \Xi_c^{ +} \pi^+ ) = 0.87^{+0.17}_{-0.11} $ and $1.45$ with and without removing the CMM, where the former is close to the lower bound and the later is well consistent with ${\cal R} = 1.41 \pm 0.17 \pm 0.10$ measured at LHCb. In addition, we show that after including the mixing, the up-down asymmetry of $\alpha( \Xi_{cc}^+ \to \Xi_c^{(\prime)0 } \pi^+)$ flips sign. Explicitly, we obtain that $\alpha(\Xi_{cc}^{+} \to \Xi_c^{\prime +} \pi^0) = 0.52$ and $\alpha(\Xi_{cc}^{+} \to \Xi_c^{ 0 } \pi^+) = 0.31$ with and without the CMM corrections, respectively, which are all negative if the mixing is absence. As a bonus, a positive value of $\alpha(\Xi_{cc}^{+} \to \Xi_c^{\prime 0} \pi^+)$ in experiments can also serve as the evidence of the $W$-exchange contributions.
|
hep-ph/9708492
|
Katri Huitu
|
K. Huitu, P.N. Pandita and K. Puolam\"aki
|
Constraining the scales of supersymmetric left-right models
|
5 pages, Latex, talk given in Beyond the Standard Model V in Balholm,
Norway
| null |
10.1063/1.54501
|
HIP-1997-41/TH
|
hep-ph
| null |
We'll review our study of the constraints on the scales in the supersymmetric
left-right model (SUSYLR). The conservation of color and electromagnetism in
the ground state of the theory implies a relation between right-handed gauge
boson mass and soft squark mass. Furthermore, in general for heavy $W_R$,
$\tan\alpha$ is larger than one, and the right-handed sneutrino VEV,
responsible for spontaneous R-parity breaking, is at most of the order
$M_{SUSY}/h_{\Delta_R}$, where $M_{SUSY}$ is supersymmetry breaking scale and
$h_{\Delta_R}$ is the Yukawa coupling in Majorana mass term for right-handed
neutrinos.
|
[
{
"created": "Fri, 29 Aug 1997 11:48:13 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Huitu",
"K.",
""
],
[
"Pandita",
"P. N.",
""
],
[
"Puolamäki",
"K.",
""
]
] |
We'll review our study of the constraints on the scales in the supersymmetric left-right model (SUSYLR). The conservation of color and electromagnetism in the ground state of the theory implies a relation between right-handed gauge boson mass and soft squark mass. Furthermore, in general for heavy $W_R$, $\tan\alpha$ is larger than one, and the right-handed sneutrino VEV, responsible for spontaneous R-parity breaking, is at most of the order $M_{SUSY}/h_{\Delta_R}$, where $M_{SUSY}$ is supersymmetry breaking scale and $h_{\Delta_R}$ is the Yukawa coupling in Majorana mass term for right-handed neutrinos.
|
1004.3297
|
Howard Baer
|
Howard Baer, Radovan Dermisek, Shibi Rajagopalan, Heaya Summy
|
Neutralino, axion and axino cold dark matter in minimal, hypercharged
and gaugino AMSB
|
29 pages including 13 figures
|
JCAP 1007:014,2010
|
10.1088/1475-7516/2010/07/014
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetric models based on anomaly-mediated SUSY breaking (AMSB)
generally give rise to a neutral wino as a WIMP cold dark matter (CDM)
candidate, whose thermal abundance is well below measured values. Here, we
investigate four scenarios to reconcile AMSB dark matter with the measured
abundance: 1. non-thermal wino production due to decays of scalar fields ({\it
e.g} moduli), 2. non-thermal wino production due to decays of gravitinos, 3.
non-thermal wino production due to heavy axino decays, and 4. the case of an
axino LSP, where the bulk of CDM is made up of axions and thermally produced
axinos. In cases 1 and 2, we expect wino CDM to constitute the entire measured
DM abundance, and we investigate wino-like WIMP direct and indirect detection
rates. Wino direct detection rates can be large, and more importantly, are
bounded from below, so that ton-scale noble liquid detectors should access all
of parameter space for m_{\tz_1}\alt 500 GeV. Indirect wino detection rates via
neutrino telescopes and space-based cosmic ray detectors can also be large. In
case 3, the DM would consist of an axion plus wino admixture, whose exact
proportions are very model dependent. In this case, it is possible that both an
axion and a wino-like WIMP could be detected experimentally. In case 4., we
calculate the re-heat temperature of the universe after inflation. In this
case, no direct or indirect WIMP signals should be seen, although direct
detection of relic axions may be possible. For each DM scenario, we show
results for the minimal AMSB model, as well as for the hypercharged and gaugino
AMSB models.
|
[
{
"created": "Mon, 19 Apr 2010 20:19:01 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2010 10:31:31 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Baer",
"Howard",
""
],
[
"Dermisek",
"Radovan",
""
],
[
"Rajagopalan",
"Shibi",
""
],
[
"Summy",
"Heaya",
""
]
] |
Supersymmetric models based on anomaly-mediated SUSY breaking (AMSB) generally give rise to a neutral wino as a WIMP cold dark matter (CDM) candidate, whose thermal abundance is well below measured values. Here, we investigate four scenarios to reconcile AMSB dark matter with the measured abundance: 1. non-thermal wino production due to decays of scalar fields ({\it e.g} moduli), 2. non-thermal wino production due to decays of gravitinos, 3. non-thermal wino production due to heavy axino decays, and 4. the case of an axino LSP, where the bulk of CDM is made up of axions and thermally produced axinos. In cases 1 and 2, we expect wino CDM to constitute the entire measured DM abundance, and we investigate wino-like WIMP direct and indirect detection rates. Wino direct detection rates can be large, and more importantly, are bounded from below, so that ton-scale noble liquid detectors should access all of parameter space for m_{\tz_1}\alt 500 GeV. Indirect wino detection rates via neutrino telescopes and space-based cosmic ray detectors can also be large. In case 3, the DM would consist of an axion plus wino admixture, whose exact proportions are very model dependent. In this case, it is possible that both an axion and a wino-like WIMP could be detected experimentally. In case 4., we calculate the re-heat temperature of the universe after inflation. In this case, no direct or indirect WIMP signals should be seen, although direct detection of relic axions may be possible. For each DM scenario, we show results for the minimal AMSB model, as well as for the hypercharged and gaugino AMSB models.
|
hep-ph/9912402
|
Eugene Levin
|
Eugene Levin (Tel Aviv U. /BNL)
|
Cost of Survival for Large Rapidity Gaps
|
4 pages, 3 figures
| null | null |
BNL-NT-99/10, TAUP -2614-99
|
hep-ph
| null |
In this talk, given at "RunII QCD and weak boson WS", we report on
calculations of the survival probability of the large rapidity gap (LRG)
processes and its energy behaviour.
|
[
{
"created": "Fri, 17 Dec 1999 14:36:44 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Levin",
"Eugene",
"",
"Tel Aviv U. /BNL"
]
] |
In this talk, given at "RunII QCD and weak boson WS", we report on calculations of the survival probability of the large rapidity gap (LRG) processes and its energy behaviour.
|
hep-ph/0305285
|
Stephen Godfrey
|
F.E. Close (Oxford) and S. Godfrey (Carleton University, CSSM
Adelaide, and TRIUMF)
|
Charmonium Hybrid Production in Exclusive B Meson Decays
|
references added and some of the text rewritten so it is clearer
|
Phys.Lett. B574 (2003) 210-216
|
10.1016/j.physletb.2003.09.011
|
ADP-03-120/T558, TRI-PP-03-04, OUTP-03-13-P
|
hep-ph hep-ex
| null |
Recent data on charmonium production in B-meson decays suggest that
charmonium hybrid mesons with mass ~4 GeV may be produced in B-decay via
c\bar{c} colour octet operators. Some of these states are likely to be narrow
with clean signatures to J/\psi pi^+ pi^- final states. Experimental signatures
and search strategies for existing B-factories are described.
|
[
{
"created": "Mon, 26 May 2003 02:19:33 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2003 21:37:57 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Close",
"F. E.",
"",
"Oxford"
],
[
"Godfrey",
"S.",
"",
"Carleton University, CSSM\n Adelaide, and TRIUMF"
]
] |
Recent data on charmonium production in B-meson decays suggest that charmonium hybrid mesons with mass ~4 GeV may be produced in B-decay via c\bar{c} colour octet operators. Some of these states are likely to be narrow with clean signatures to J/\psi pi^+ pi^- final states. Experimental signatures and search strategies for existing B-factories are described.
|
1403.1001
|
Roman Nevzorov
|
C.D. Froggatt, R. Nevzorov, H.B. Nielsen, A.W. Thomas
|
Cosmological constant in SUGRA models with Planck scale SUSY breaking
and degenerate vacua
|
12 pages, 1 figure, version of the paper published in PLB
|
Phys.Lett. B 737 (2014) 167-171
|
10.1016/j.physletb.2014.08.027
|
ADP-14-8/T866
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The empirical mass of the Higgs boson suggests small to vanishing values of
the quartic Higgs self--coupling and the corresponding beta function at the
Planck scale, leading to degenerate vacua. This leads us to suggest that the
measured value of the cosmological constant can originate from supergravity
(SUGRA) models with degenerate vacua. This scenario is realised if there are at
least three exactly degenerate vacua. In the first vacuum, associated with the
physical one, local supersymmetry (SUSY) is broken near the Planck scale while
the breakdown of the SU(2)_W\times U(1)_Y symmetry takes place at the
electroweak (EW) scale. In the second vacuum local SUSY breaking is induced by
gaugino condensation at a scale which is just slightly lower than \Lambda_{QCD}
in the physical vacuum. Finally, in the third vacuum local SUSY and EW symmetry
are broken near the Planck scale.
|
[
{
"created": "Wed, 5 Mar 2014 04:30:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2014 12:32:35 GMT",
"version": "v2"
}
] |
2015-06-19
|
[
[
"Froggatt",
"C. D.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Thomas",
"A. W.",
""
]
] |
The empirical mass of the Higgs boson suggests small to vanishing values of the quartic Higgs self--coupling and the corresponding beta function at the Planck scale, leading to degenerate vacua. This leads us to suggest that the measured value of the cosmological constant can originate from supergravity (SUGRA) models with degenerate vacua. This scenario is realised if there are at least three exactly degenerate vacua. In the first vacuum, associated with the physical one, local supersymmetry (SUSY) is broken near the Planck scale while the breakdown of the SU(2)_W\times U(1)_Y symmetry takes place at the electroweak (EW) scale. In the second vacuum local SUSY breaking is induced by gaugino condensation at a scale which is just slightly lower than \Lambda_{QCD} in the physical vacuum. Finally, in the third vacuum local SUSY and EW symmetry are broken near the Planck scale.
|
hep-ph/9509239
|
Davison Soper
|
Arjun Berera and Davison E. Soper
|
Behavior of Diffractive Parton Distribution Functions
|
35 pages, REVTEX, uses epsf.tex to insert figures; with 11 figures in
encapsulated postscript form, which epsf.tex will insert
|
Phys.Rev.D53:6162-6179,1996
|
10.1103/PhysRevD.53.6162
|
PSU/TH/163 and OITS 581
|
hep-ph
| null |
Diffractive parton distribution functions give the probability to find a
parton in a hadron if the hadron is diffractively scattered. We provide an
operator definition of these functions and discuss their relation to
diffractive deeply inelastic scattering and to photoproduction of jets at HERA.
We perform a calculation in the style of ``constituent counting rules'' for the
behavior of these functions when the detected parton carries almost all of the
longitudinal momentum transferred from the scattered hadron.
|
[
{
"created": "Wed, 6 Sep 1995 19:47:17 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Berera",
"Arjun",
""
],
[
"Soper",
"Davison E.",
""
]
] |
Diffractive parton distribution functions give the probability to find a parton in a hadron if the hadron is diffractively scattered. We provide an operator definition of these functions and discuss their relation to diffractive deeply inelastic scattering and to photoproduction of jets at HERA. We perform a calculation in the style of ``constituent counting rules'' for the behavior of these functions when the detected parton carries almost all of the longitudinal momentum transferred from the scattered hadron.
|
0707.3366
|
Santiago Noguera
|
A. Courtoy, S. Noguera
|
The Pion-Photon Transition Distribution Amplitudes in the Nambu-Jona
Lasinio Model
|
14 pag. and 6 fig, final version (to appear in Phys. Rev. D)
|
Phys.Rev.D76:094026,2007
|
10.1103/PhysRevD.76.094026
| null |
hep-ph
| null |
We define the pion-photon Transition Distribution Amplitudes (TDA) in a field
theoretic formalism from a covariant Bethe-Salpeter approach for the
determination of the bound state. We apply our formalism to the Nambu - Jona
Lasinio model, as a realistic theory of the pion. The obtained vector and axial
TDAs satisfy all features required by general considerations. In particular,
sum rules and polynomiality condition are explicitly verified. We have
numerically proved that the odd coefficients in the polynomiality expansion of
the vector TDA vanish in the chiral limit. The role of PCAC and the presence of
a pion pole are explicitly shown.
|
[
{
"created": "Mon, 23 Jul 2007 12:49:48 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2007 10:03:19 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Nov 2007 12:53:36 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Courtoy",
"A.",
""
],
[
"Noguera",
"S.",
""
]
] |
We define the pion-photon Transition Distribution Amplitudes (TDA) in a field theoretic formalism from a covariant Bethe-Salpeter approach for the determination of the bound state. We apply our formalism to the Nambu - Jona Lasinio model, as a realistic theory of the pion. The obtained vector and axial TDAs satisfy all features required by general considerations. In particular, sum rules and polynomiality condition are explicitly verified. We have numerically proved that the odd coefficients in the polynomiality expansion of the vector TDA vanish in the chiral limit. The role of PCAC and the presence of a pion pole are explicitly shown.
|
1605.06606
|
Vadim Guzey
|
M. Alvioli (Perugia U.), L. Frankfurt (Tel Aviv U. and Penn State U.),
V. Guzey (PNPI), M. Strikman (Penn State U.), and M. Zhalov (PNPI)
|
Mapping color fluctuations in the photon in ultraperipheral heavy ion
collisions at the Large Hadron Collider
|
11 pages, 4 figures. Matches the final published version
|
Phys. Lett. B767 (2017) 450-457
|
10.1016/j.physletb.2017.02.034
| null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We model effects of color fluctuations (CFs) in the light-cone photon wave
function and for the first time make predictions for the distribution over the
number of wounded nucleons $\nu$ in the inelastic photon-nucleus scattering. We
show that CFs lead to a dramatic enhancement of this distribution at $\nu=1$
and large $\nu > 10$. We also study the implications of different scales and
CFs in the photon wave function on the total transverse energy $\Sigma E_T$ and
other observables in inelastic $\gamma A$ scattering with different triggers.
Our predictions can be tested in proton-nucleus and nucleus-nucleus
ultraperipheral collisions at the LHC and will help to map CFs, whose first
indications have already been observed at the LHC.
|
[
{
"created": "Sat, 21 May 2016 08:42:22 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2017 08:34:17 GMT",
"version": "v2"
}
] |
2017-03-16
|
[
[
"Alvioli",
"M.",
"",
"Perugia U."
],
[
"Frankfurt",
"L.",
"",
"Tel Aviv U. and Penn State U."
],
[
"Guzey",
"V.",
"",
"PNPI"
],
[
"Strikman",
"M.",
"",
"Penn State U."
],
[
"Zhalov",
"M.",
"",
"PNPI"
]
] |
We model effects of color fluctuations (CFs) in the light-cone photon wave function and for the first time make predictions for the distribution over the number of wounded nucleons $\nu$ in the inelastic photon-nucleus scattering. We show that CFs lead to a dramatic enhancement of this distribution at $\nu=1$ and large $\nu > 10$. We also study the implications of different scales and CFs in the photon wave function on the total transverse energy $\Sigma E_T$ and other observables in inelastic $\gamma A$ scattering with different triggers. Our predictions can be tested in proton-nucleus and nucleus-nucleus ultraperipheral collisions at the LHC and will help to map CFs, whose first indications have already been observed at the LHC.
|
hep-ph/0104192
|
M. V. T. Machado
|
M.B. Gay Ducati, M.V.T. Machado (UFRGS)
|
Truncated BFKL Series in Electron-Proton Collisions
|
23 pages, 13 figures, uses jhep.cls
| null | null | null |
hep-ph
| null |
We study the contribution of the truncated BFKL series to the
electroproduction process showing that a reliable description is obtained
taking into account two orders in perturbation theory. Using the recent F2
logarithmic slope data as a constraint to the adustable parameters, the
inclusive structure function is described in a wide range of the small x HERA
kinematical region, consistent with the unitarity bound. We also extrapolate
the extimates to the THERA region.
|
[
{
"created": "Thu, 19 Apr 2001 14:01:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ducati",
"M. B. Gay",
"",
"UFRGS"
],
[
"Machado",
"M. V. T.",
"",
"UFRGS"
]
] |
We study the contribution of the truncated BFKL series to the electroproduction process showing that a reliable description is obtained taking into account two orders in perturbation theory. Using the recent F2 logarithmic slope data as a constraint to the adustable parameters, the inclusive structure function is described in a wide range of the small x HERA kinematical region, consistent with the unitarity bound. We also extrapolate the extimates to the THERA region.
|
1609.00208
|
Edward Hardy
|
Edward Hardy
|
Miniclusters in the Axiverse
|
19 pages, 7 figures, JHEP version
| null |
10.1007/JHEP02(2017)046
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If dark matter is an axion-like-particle a significant fraction of the
present day relic abundance could be concentrated in compact gravitationally
bound miniclusters. We study the minicluster masses compatible with the dark
matter relic density constraint. If they form from fluctuations produced by PQ
symmetry breaking, minicluster masses up to hundreds of solar masses are
possible, although over most of the parameter space they are much lighter. The
size of these objects is typically within a few orders of magnitude of an
astronomical unit. We also show that miniclusters can form if an axion gets
mass from a hidden sector with a first order phase transition that takes a
relatively long time to complete. Therefore they can appear in models where PQ
symmetry is broken before inflation, compatible with large axion decay
constants and string theory UV completions.
|
[
{
"created": "Thu, 1 Sep 2016 12:15:58 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Feb 2017 15:06:07 GMT",
"version": "v2"
}
] |
2017-03-08
|
[
[
"Hardy",
"Edward",
""
]
] |
If dark matter is an axion-like-particle a significant fraction of the present day relic abundance could be concentrated in compact gravitationally bound miniclusters. We study the minicluster masses compatible with the dark matter relic density constraint. If they form from fluctuations produced by PQ symmetry breaking, minicluster masses up to hundreds of solar masses are possible, although over most of the parameter space they are much lighter. The size of these objects is typically within a few orders of magnitude of an astronomical unit. We also show that miniclusters can form if an axion gets mass from a hidden sector with a first order phase transition that takes a relatively long time to complete. Therefore they can appear in models where PQ symmetry is broken before inflation, compatible with large axion decay constants and string theory UV completions.
|
hep-ph/0312090
|
Christoph Bobeth
|
Christoph Bobeth, Paolo Gambino, Martin Gorbahn, and Ulrich Haisch
|
Complete NNLO QCD Analysis of B -> X_s l^+ l^- and Higher Order
Electroweak Effects
|
26 pages, 7 figures; v5: corrected normalisation in Eq. (5),
numerical results unchanged
|
JHEP 0404 (2004) 071
|
10.1088/1126-6708/2004/04/071
|
CERN-TH-2003-260; TUM-HEP-532-03; FERMILAB-PUB-03-046-T;
UCSD-PTH-03-19; IPPP-03-77
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We complete the next-to-next-to-leading order QCD calculation of the
branching ratio for B -> X_s l^+ l^- including recent results for the
three-loop anomalous dimension matrix and two-loop matrix elements. These new
contributions modify the branching ratio in the low-q^2 region, BR_ll, by about
+1% and -4%, respectively. We furthermore discuss the appropriate normalization
of the electromagnetic coupling alpha and calculate the dominant higher order
electroweak effects, showing that, due to accidental cancellations, they change
BR_ll by only -1.5% if alpha(mu) is normalized at mu = O(m_b), while they shift
it by about -8.5% if one uses a high scale normalization mu = O(M_W). The
position of the zero of the forward-backward asymmetry, q_0^2, is changed by
around +2%. After introducing a few additional improvements in order to reduce
the theoretical error, we perform a comprehensive study of the uncertainty. We
obtain BR_ll(1 GeV^2 <= q^2 <= 6 GeV^2) = (1.57 +- 0.16) x 10^-6 and q_0^2 =
(3.76 +- 0.33) GeV^2 and note that the part of the uncertainty due to the
b-quark mass can be easily reduced.
|
[
{
"created": "Fri, 5 Dec 2003 20:44:45 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Dec 2003 02:25:05 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Mar 2004 17:09:14 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Oct 2005 19:54:35 GMT",
"version": "v4"
},
{
"created": "Sun, 16 Oct 2011 19:12:40 GMT",
"version": "v5"
}
] |
2011-10-18
|
[
[
"Bobeth",
"Christoph",
""
],
[
"Gambino",
"Paolo",
""
],
[
"Gorbahn",
"Martin",
""
],
[
"Haisch",
"Ulrich",
""
]
] |
We complete the next-to-next-to-leading order QCD calculation of the branching ratio for B -> X_s l^+ l^- including recent results for the three-loop anomalous dimension matrix and two-loop matrix elements. These new contributions modify the branching ratio in the low-q^2 region, BR_ll, by about +1% and -4%, respectively. We furthermore discuss the appropriate normalization of the electromagnetic coupling alpha and calculate the dominant higher order electroweak effects, showing that, due to accidental cancellations, they change BR_ll by only -1.5% if alpha(mu) is normalized at mu = O(m_b), while they shift it by about -8.5% if one uses a high scale normalization mu = O(M_W). The position of the zero of the forward-backward asymmetry, q_0^2, is changed by around +2%. After introducing a few additional improvements in order to reduce the theoretical error, we perform a comprehensive study of the uncertainty. We obtain BR_ll(1 GeV^2 <= q^2 <= 6 GeV^2) = (1.57 +- 0.16) x 10^-6 and q_0^2 = (3.76 +- 0.33) GeV^2 and note that the part of the uncertainty due to the b-quark mass can be easily reduced.
|
hep-ph/0210312
|
Joannis Papavassiliou
|
J. Papavassiliou, J. Bernabeu, and J. Vidal
|
On the definition and observability of the neutrino charge radius
|
5 pages, no figures, talk presented at the XXX International Meeting
on Fundamental Physics, IMFP2002, Jaca (Huesca), January 28th -- February
1st, 2002
|
Nucl.Phys.Proc.Suppl. 114 (2003) 197-201
|
10.1016/S0920-5632(02)01905-9
|
FTUV-02-1023
|
hep-ph
| null |
We present a brief summary of recent results concerning the unambiguous
definition and experimental extraction of the gauge-invariant and
process-independent neutrino charge radius.
|
[
{
"created": "Wed, 23 Oct 2002 12:51:29 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Papavassiliou",
"J.",
""
],
[
"Bernabeu",
"J.",
""
],
[
"Vidal",
"J.",
""
]
] |
We present a brief summary of recent results concerning the unambiguous definition and experimental extraction of the gauge-invariant and process-independent neutrino charge radius.
|
1104.2919
|
Edison Franco
|
Edison T. Franco
|
Question for SU(5) x SU(5) string unification
|
13 pages, 9 figures. References updated and typos corrected
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Here we ask if it is possible to have string unification in
$\mathsf{SU(5)\times SU(5)}$ gauge group. We specifically investigate the
weakly coupled heterotic string unification for the four couplings in this
framework. We show that only a limited versions of $\mathsf{SU(5)\times SU(5)}$
with adjoint representation components at intermediated scales, between $M_Z$
and $\Lambda$ (unification), are allowed. This is essentially due to the
limitation in the parameter space to the gauge coupling constant
$\alpha_1^{-1}$ related to hypercharge. Indeed, only the vanishing hypercharge
decompositions of $\mathsf{SU(5)_L}$ subgroup can help to this unification,
namely, the fermion and boson triplets, $\Sigma_3\sim(1,3)_0$, and the fermion
and boson octets, $\Sigma_8\sim(8,1)_0$. Thus, these intermediate particles are
compatible with the so-called Adjoint $\mathsf{SU(5)}$. The triplets must live
in TeV region and could be accessible at colliders while the octets must alive
in very high energy scales. We also show that the non-SUSY unification scenario
requires the introduction of an additional $\mathsf{SU(2)_L}$ scalar color
triplet, $\eta \sim (3,3)_{-{1}/{3}}$, at relatively low energies ($\sim
10^{5-11}$GeV), and it may induce the proton decay.
|
[
{
"created": "Thu, 14 Apr 2011 20:26:11 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Apr 2011 21:01:32 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Mar 2017 09:56:28 GMT",
"version": "v3"
}
] |
2017-03-14
|
[
[
"Franco",
"Edison T.",
""
]
] |
Here we ask if it is possible to have string unification in $\mathsf{SU(5)\times SU(5)}$ gauge group. We specifically investigate the weakly coupled heterotic string unification for the four couplings in this framework. We show that only a limited versions of $\mathsf{SU(5)\times SU(5)}$ with adjoint representation components at intermediated scales, between $M_Z$ and $\Lambda$ (unification), are allowed. This is essentially due to the limitation in the parameter space to the gauge coupling constant $\alpha_1^{-1}$ related to hypercharge. Indeed, only the vanishing hypercharge decompositions of $\mathsf{SU(5)_L}$ subgroup can help to this unification, namely, the fermion and boson triplets, $\Sigma_3\sim(1,3)_0$, and the fermion and boson octets, $\Sigma_8\sim(8,1)_0$. Thus, these intermediate particles are compatible with the so-called Adjoint $\mathsf{SU(5)}$. The triplets must live in TeV region and could be accessible at colliders while the octets must alive in very high energy scales. We also show that the non-SUSY unification scenario requires the introduction of an additional $\mathsf{SU(2)_L}$ scalar color triplet, $\eta \sim (3,3)_{-{1}/{3}}$, at relatively low energies ($\sim 10^{5-11}$GeV), and it may induce the proton decay.
|
1310.1770
|
S. V. Troitsky
|
S.V. Troitsky and V.E. Troitsky
|
Transition from a relativistic constituent-quark model to the
quantum-chromodynamical asymptotics: a quantitative description of the pion
electromagnetic form factor at intermediate values of the momentum transfer
|
7 pages, RevTex 4.1, 5 figures. V2: a reference added, minor textual
changes, version accepted by Phys. Rev. D
|
Phys. Rev. D 88, 093005 (2013)
|
10.1103/PhysRevD.88.093005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We adopt a non-perturbative relativistic constituent-quark model for the
pi-meson electromagnetic form factor, which have successfully predicted
experimental results, and supplement it with the effective momentum-dependent
quark mass to study quantitatively the transition to the perturbative QCD
asymptotics. The required asymptotical behaviour (including both the Q^{-2}
fall-off and the correct coefficient) settles down automatically when the quark
mass is switched off; however, the present experimental data on the form factor
suggest that this cannot happen at the values of the momentum transfer below
~10 GeV^2. The effective constituent-quark mass below this scale acquires
substantial non-perturbative contributions.
|
[
{
"created": "Mon, 7 Oct 2013 13:13:46 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 2013 07:16:05 GMT",
"version": "v2"
}
] |
2013-11-19
|
[
[
"Troitsky",
"S. V.",
""
],
[
"Troitsky",
"V. E.",
""
]
] |
We adopt a non-perturbative relativistic constituent-quark model for the pi-meson electromagnetic form factor, which have successfully predicted experimental results, and supplement it with the effective momentum-dependent quark mass to study quantitatively the transition to the perturbative QCD asymptotics. The required asymptotical behaviour (including both the Q^{-2} fall-off and the correct coefficient) settles down automatically when the quark mass is switched off; however, the present experimental data on the form factor suggest that this cannot happen at the values of the momentum transfer below ~10 GeV^2. The effective constituent-quark mass below this scale acquires substantial non-perturbative contributions.
|
1009.6137
|
Antonio Vairo
|
Antonio Vairo
|
Quarkonium in a weakly-coupled quark-gluon plasma
|
9 pages, 2 figures; contribution to QCD@Work 2010, Martina Franca,
June 20-23, 2010
|
AIP Conf.Proc.1317:241-249,2011
|
10.1063/1.3536565
|
TUM-EFT 13/10
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report about a recent calculation of the heavy quarkonium mass and decay
width in a quark-gluon plasma, whose temperature T and screening mass m_D
satisfy the hierarchy m alpha_s >> pi T >> m alpha_s^2 >> m_D, m being the
heavy-quark mass, up to order m alpha_s^5. The calculation may be relevant to
understand the behavior of the Y(1S) in a quark-gluon plasma at present-day
colliders.
|
[
{
"created": "Thu, 30 Sep 2010 13:58:22 GMT",
"version": "v1"
}
] |
2011-02-01
|
[
[
"Vairo",
"Antonio",
""
]
] |
We report about a recent calculation of the heavy quarkonium mass and decay width in a quark-gluon plasma, whose temperature T and screening mass m_D satisfy the hierarchy m alpha_s >> pi T >> m alpha_s^2 >> m_D, m being the heavy-quark mass, up to order m alpha_s^5. The calculation may be relevant to understand the behavior of the Y(1S) in a quark-gluon plasma at present-day colliders.
|
hep-ph/0111268
|
Antonio Lopez Maroto
|
Antonio L. Maroto
|
Cosmological magnetic fields induced by metric perturbations after
inflation
|
8 pages, 1 figure. Presented at COSMO-01 conference, Rovaniemi,
Finland, August 29-September 4, 2001
| null | null | null |
hep-ph
| null |
We consider the amplification of electromagnetic quantum vacuum fluctuations
induced by the presence of metric perturbations at the end of inflation. We
obtain the amplitude of the corresponding magnetic fields on super-Hubble
scales and compare it with the requirements of the galactic dynamo mechanism
for different values of the spectral index. Finally we discuss the possible
effects of the dissipation of such fields in the form of gravitational waves.
|
[
{
"created": "Wed, 21 Nov 2001 20:35:56 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Maroto",
"Antonio L.",
""
]
] |
We consider the amplification of electromagnetic quantum vacuum fluctuations induced by the presence of metric perturbations at the end of inflation. We obtain the amplitude of the corresponding magnetic fields on super-Hubble scales and compare it with the requirements of the galactic dynamo mechanism for different values of the spectral index. Finally we discuss the possible effects of the dissipation of such fields in the form of gravitational waves.
|
1809.00384
|
Ewelina Szarek
|
Ewelina Szarek
|
Soft anomalous dimension matrices in heavy quark-antiquark
hadroproduction in association with a gluon jet
|
36 pages, 8 figures
| null |
10.5506/APhysPolB.49.1839
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the soft anomalous dimension (SAD) matrices for production of
massive quarks $Q$ and $\bar{Q}$ in association with a gluon jet, from massless
quarks $q$ and antiquarks $\bar{q}$: $q\bar{q}\rightarrow Q\bar{Q}g$, and in
the gluon scattering $gg\rightarrow Q\bar{Q}g$. To analyze the behaviour of the
eigenvalues of SAD matrices we perform numerical studies of their eigensystems
at two special kinematical configurations.
|
[
{
"created": "Sun, 2 Sep 2018 20:20:09 GMT",
"version": "v1"
}
] |
2018-12-05
|
[
[
"Szarek",
"Ewelina",
""
]
] |
We compute the soft anomalous dimension (SAD) matrices for production of massive quarks $Q$ and $\bar{Q}$ in association with a gluon jet, from massless quarks $q$ and antiquarks $\bar{q}$: $q\bar{q}\rightarrow Q\bar{Q}g$, and in the gluon scattering $gg\rightarrow Q\bar{Q}g$. To analyze the behaviour of the eigenvalues of SAD matrices we perform numerical studies of their eigensystems at two special kinematical configurations.
|
hep-ph/0508017
|
Mofazzal Azam
|
Mofazzal Azam
|
Some comments on the divergence of perturbation series in Quantum
Eletrodynamics
|
Final Version, To appear in Modern Physics Letters A
|
Mod.Phys.Lett.A21:1161-1166,2006
|
10.1142/S0217732306019463
| null |
hep-ph hep-th quant-ph
| null |
It has been argued by Dyson that the perturbation series in coupling constant
in QED can not be convergent. We find that similiar albeit slightly different
arguments lead to the divergence of the series of $1/N_f$ expansion in QED.
|
[
{
"created": "Mon, 1 Aug 2005 09:29:21 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Sep 2005 09:22:35 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2005 07:43:35 GMT",
"version": "v3"
}
] |
2010-11-05
|
[
[
"Azam",
"Mofazzal",
""
]
] |
It has been argued by Dyson that the perturbation series in coupling constant in QED can not be convergent. We find that similiar albeit slightly different arguments lead to the divergence of the series of $1/N_f$ expansion in QED.
|
hep-ph/9604354
| null |
S. Dawson (BNL) and H. Haber (UCSC)
|
Electroweak Symmetry Breaking and Physics Beyond the Standard Model
|
To be published in {\it Electroweak Symmetry Breaking and New Physics
at the TeV Scale}, edited by T.L. Barklow, S. Dawson, H.E. Haber, and J.L.
Siegrist. Latex using equ.sty and lprocldpf.sty. Equation numbering corrected
| null | null |
BNL-HEP/TH-96/5, SCIPP-96/14
|
hep-ph
| null |
In order to extend the Standard Model to TeV scale energies one must address
two basic questions: (1) What is the complete description of the effective
theory of fundamental particles at and below the electroweak scale? and (2)
What is the dynamics responsible for electroweak symmetry breaking? The answers
to these questions are crucial for addressing the third outstanding question of
particle physics: What are the origins of the Standard Model parameters? We
briefly summarize current theoretical approaches to answering these questions.
|
[
{
"created": "Thu, 18 Apr 1996 18:14:52 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 1996 14:01:31 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Dawson",
"S.",
"",
"BNL"
],
[
"Haber",
"H.",
"",
"UCSC"
]
] |
In order to extend the Standard Model to TeV scale energies one must address two basic questions: (1) What is the complete description of the effective theory of fundamental particles at and below the electroweak scale? and (2) What is the dynamics responsible for electroweak symmetry breaking? The answers to these questions are crucial for addressing the third outstanding question of particle physics: What are the origins of the Standard Model parameters? We briefly summarize current theoretical approaches to answering these questions.
|
hep-ph/0609237
|
Nora Brambilla
|
Nora Brambilla
|
Systems of two heavy quarks with effective field theories
|
7 pages, Invited talk at the 7th Workshop on Continuous Advances in
QCD, Minneapolis, Minnesota, May 11-14, 2006
| null |
10.1142/9789812708267_0014
|
IFUM 870-FT
|
hep-ph
| null |
I discuss results and applications of QCD nonrelativistic effective field
theories for systems with two heavy quarks.
|
[
{
"created": "Fri, 22 Sep 2006 14:53:50 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Brambilla",
"Nora",
""
]
] |
I discuss results and applications of QCD nonrelativistic effective field theories for systems with two heavy quarks.
|
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