id
stringlengths 9
14
| submitter
stringlengths 1
56
⌀ | authors
stringlengths 5
7.68k
| title
stringlengths 3
299
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 9
298
⌀ | doi
stringlengths 12
97
⌀ | report-no
stringlengths 3
341
⌀ | categories
stringclasses 869
values | license
stringclasses 9
values | orig_abstract
stringlengths 16
2.44k
| versions
listlengths 1
39
| update_date
stringlengths 10
10
| authors_parsed
listlengths 1
565
| abstract
stringlengths 13
2.44k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1706.09039
|
Ben Allanach PhD
|
B.C. Allanach (1), D. Bhatia (2) and A.M. Iyer (2) ((1) Cambridge (2)
TIFR)
|
Dissecting Multi-Photon Resonances at the Large Hadron Collider
|
26 pages, 7 figures. v2 incorporates extra discussion in response to
referee and a discussion of photon conversion
| null |
10.1140/epjc/s10052-017-5162-5
|
DAMTP-2017-28, TIFR/TH/17-29
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the phenomenology of the production, at the 13 TeV Large Hadron
Collider (LHC), of a heavy resonance $X$, which decays via other new on-shell
particles $n$ into multi- (i.e.\ three or more) photon final states. In the
limit that $n$ has a much smaller mass than $X$, the multi-photon final state
may dominantly appear as a two photon final state because the $\gamma$s from
the $n$ decay are highly collinear and remain unresolved. We discuss how to
discriminate this scenario from $X \rightarrow \gamma \gamma$: rather than
discarding non-isolated photons, it is better instead to relax the isolation
criterion and instead form photon jet substructure variables. The spins of $X$
and $n$ leave their imprint upon the distribution of pseudorapidity gap $\Delta
\eta$ between the apparent two photon states. Depending on the total integrated
luminosity, this can be used in many cases to claim discrimination between the
possible spin choices of $X$ and $n$, although the case where $X$ and $n$ are
both scalar particles cannot be discriminated from the direct $X \rightarrow
\gamma \gamma$ decay in this manner. Information on the mass of $n$ can be
gained by considering the mass of each photon jet.
|
[
{
"created": "Tue, 27 Jun 2017 20:28:07 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Aug 2017 02:37:35 GMT",
"version": "v2"
}
] |
2017-10-11
|
[
[
"Allanach",
"B. C.",
""
],
[
"Bhatia",
"D.",
""
],
[
"Iyer",
"A. M.",
""
]
] |
We examine the phenomenology of the production, at the 13 TeV Large Hadron Collider (LHC), of a heavy resonance $X$, which decays via other new on-shell particles $n$ into multi- (i.e.\ three or more) photon final states. In the limit that $n$ has a much smaller mass than $X$, the multi-photon final state may dominantly appear as a two photon final state because the $\gamma$s from the $n$ decay are highly collinear and remain unresolved. We discuss how to discriminate this scenario from $X \rightarrow \gamma \gamma$: rather than discarding non-isolated photons, it is better instead to relax the isolation criterion and instead form photon jet substructure variables. The spins of $X$ and $n$ leave their imprint upon the distribution of pseudorapidity gap $\Delta \eta$ between the apparent two photon states. Depending on the total integrated luminosity, this can be used in many cases to claim discrimination between the possible spin choices of $X$ and $n$, although the case where $X$ and $n$ are both scalar particles cannot be discriminated from the direct $X \rightarrow \gamma \gamma$ decay in this manner. Information on the mass of $n$ can be gained by considering the mass of each photon jet.
|
hep-ph/0605060
|
Andrea Beraudo
|
W.M. Alberico, A. Beraudo, P. Czerski and A. Molinari
|
Finite momentum meson correlation functions in a QCD plasma
|
29 pages, 25 figures, submitted to Nucl.Phys.A
|
Nucl.Phys. A775 (2006) 188-211
|
10.1016/j.nuclphysa.2006.06.006
| null |
hep-ph
| null |
The finite momentum meson spectral function (MSF) in the pseudoscalar channel
is evaluated, adopting for the fermionic propagators HTL expressions. The
different contributions to the meson spectral functions are clearly displayed.
Our analysis may be of relevance for lattice studies of MSF based so far on the
Maximum Entropy Method. As a further step the correlation function along the
(imaginary-) temporal direction is evaluated.
|
[
{
"created": "Fri, 5 May 2006 14:07:38 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Alberico",
"W. M.",
""
],
[
"Beraudo",
"A.",
""
],
[
"Czerski",
"P.",
""
],
[
"Molinari",
"A.",
""
]
] |
The finite momentum meson spectral function (MSF) in the pseudoscalar channel is evaluated, adopting for the fermionic propagators HTL expressions. The different contributions to the meson spectral functions are clearly displayed. Our analysis may be of relevance for lattice studies of MSF based so far on the Maximum Entropy Method. As a further step the correlation function along the (imaginary-) temporal direction is evaluated.
|
hep-ph/9511463
|
Liao Yi
|
Yi Liao, Yu-Ping Kuang, Chong-Sheng Li
|
Heavy Fermion Screening Effects and Gauge Invariance
|
a miss-print fixed, 7 pages, LaTex, no figures
|
Phys.Rev. D54 (1996) 3503-3505
|
10.1103/PhysRevD.54.3503
|
TUIMP-TH-95/74
|
hep-ph
| null |
We show that the naively expected large virtual heavy fermion effects in low
energy processes may be screened if the process under consideration contains
external gauge bosons constrained by gauge invariance. We illustrate this by a
typical example of the process $\gamma\gamma\to b \bar{b}$. Phenomenological
implications are also briefly indicated.
|
[
{
"created": "Thu, 30 Nov 1995 01:38:16 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Dec 1995 07:29:33 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Liao",
"Yi",
""
],
[
"Kuang",
"Yu-Ping",
""
],
[
"Li",
"Chong-Sheng",
""
]
] |
We show that the naively expected large virtual heavy fermion effects in low energy processes may be screened if the process under consideration contains external gauge bosons constrained by gauge invariance. We illustrate this by a typical example of the process $\gamma\gamma\to b \bar{b}$. Phenomenological implications are also briefly indicated.
|
1306.4497
|
Monika Blanke
|
Monika Blanke
|
Squark flavour violation and naturalness at the LHC
|
5 pages, 7 figures. Proceedings for LHCP 2013: First Large Hadron
Collider Physics Conference in Barcelona, May 13-18, 2013
| null |
10.1051/epjconf/20136015010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
While rare meson decays place stringent constraints on much of the flavour
violating parameter space of supersymmetric models, the mixing between
right-handed top and charm squarks is so far unconstrained by the available
data. Such mixing has in fact a very appealing phenomenology: it significantly
weakens the current experimental bounds from direct squark searches and leads
to a modest reduction of fine-tuning. The scenario can be tested already with
the present 8 TeV data set by looking for the flavour violating final state t
anti-t + missing E_T, thanks to the large squark pair production cross section.
|
[
{
"created": "Wed, 19 Jun 2013 11:33:27 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Blanke",
"Monika",
""
]
] |
While rare meson decays place stringent constraints on much of the flavour violating parameter space of supersymmetric models, the mixing between right-handed top and charm squarks is so far unconstrained by the available data. Such mixing has in fact a very appealing phenomenology: it significantly weakens the current experimental bounds from direct squark searches and leads to a modest reduction of fine-tuning. The scenario can be tested already with the present 8 TeV data set by looking for the flavour violating final state t anti-t + missing E_T, thanks to the large squark pair production cross section.
|
hep-ph/0009257
|
Edmond Berger
|
E. L. Berger (Argonne) and M. Klasen (Hamburg)
|
Constraints on the Proton's Gluon Density from Lepton-Pair Production
|
3 pages, latex, 2 figures, paper presented by E. L. Berger at ICHEP
2000, the XXXth International Conference on High Energy Physics July 27 -
August 2, 2000, Osaka, Japan
| null | null |
ANL-HEP-CP-00-098, DESY 00-135
|
hep-ph
| null |
Massive lepton-pair production, the Drell-Yan process, should be a good
source of independent constraints on the gluon density, free from the
experimental and theoretical complications of photon isolation that beset
studies of prompt photon production. We provide predictions for the
spin-averaged and spin-dependent differential cross sections as a function of
transverse momentum $Q_T$.
|
[
{
"created": "Thu, 21 Sep 2000 17:26:37 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Berger",
"E. L.",
"",
"Argonne"
],
[
"Klasen",
"M.",
"",
"Hamburg"
]
] |
Massive lepton-pair production, the Drell-Yan process, should be a good source of independent constraints on the gluon density, free from the experimental and theoretical complications of photon isolation that beset studies of prompt photon production. We provide predictions for the spin-averaged and spin-dependent differential cross sections as a function of transverse momentum $Q_T$.
|
2203.07218
|
Patrick Draper
|
Nikita Blinov, Nathaniel Craig, Matthew J. Dolan, Jordy de Vries,
Patrick Draper, Isabel Garcia Garcia, Benjamin Lillard, Jessie Shelton
|
Snowmass White Paper: Strong CP Beyond Axion Direct Detection
|
5 pages, contribution to Snowmass 2021
| null | null | null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We sketch recent progress and promising future directions for research
connected with the strong CP problem. Topics surveyed include axion dark matter
substructure and its gravitational detection; axion model building and the
quality problem; experimental tests of ultraviolet solutions; and connections
to lattice QCD.
|
[
{
"created": "Mon, 14 Mar 2022 15:58:05 GMT",
"version": "v1"
}
] |
2022-03-15
|
[
[
"Blinov",
"Nikita",
""
],
[
"Craig",
"Nathaniel",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"de Vries",
"Jordy",
""
],
[
"Draper",
"Patrick",
""
],
[
"Garcia",
"Isabel Garcia",
""
],
[
"Lillard",
"Benjamin",
""
],
[
"Shelton",
"Jessie",
""
]
] |
We sketch recent progress and promising future directions for research connected with the strong CP problem. Topics surveyed include axion dark matter substructure and its gravitational detection; axion model building and the quality problem; experimental tests of ultraviolet solutions; and connections to lattice QCD.
|
hep-ph/0211213
|
Alexander Belyaev
|
Howard Baer, Csaba Balazs and Alexander Belyaev
|
Relic density of neutralinos in minimal supergravity
|
LaTeX, 10 pages. Talk given by Alexander Belyaev at SUSY'02, "The
10th International Conference on Supersymmetry and Unification of Fundamental
Interactions", DESY, Hamburg, Germany, 17-23 June 2002
| null | null | null |
hep-ph
| null |
We evaluate the relic density of neutralinos in the minimal supergravity
(mSUGRA) model. All 2->2 neutralino annihilation diagrams, as well as all
initial states involving sleptons, charginos, neutralinos and third generation
squarks are included. Relativistic thermal averaging of the velocity times
cross sections is performed. We find that co-annihilation effects are only
important on the edges of the model parameter space, where some amount of
fine-tuning is necessary to obtain a reasonable relic density. Alternatively,
at high tan(beta), annihilation through the broad Higgs resonances gives rise
to an acceptable neutralino relic density over broad regions of parameter space
where little or no fine-tuning is needed.
|
[
{
"created": "Thu, 14 Nov 2002 02:12:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Baer",
"Howard",
""
],
[
"Balazs",
"Csaba",
""
],
[
"Belyaev",
"Alexander",
""
]
] |
We evaluate the relic density of neutralinos in the minimal supergravity (mSUGRA) model. All 2->2 neutralino annihilation diagrams, as well as all initial states involving sleptons, charginos, neutralinos and third generation squarks are included. Relativistic thermal averaging of the velocity times cross sections is performed. We find that co-annihilation effects are only important on the edges of the model parameter space, where some amount of fine-tuning is necessary to obtain a reasonable relic density. Alternatively, at high tan(beta), annihilation through the broad Higgs resonances gives rise to an acceptable neutralino relic density over broad regions of parameter space where little or no fine-tuning is needed.
|
hep-ph/0510015
|
Serguei Molodtsov
|
S.V. Molodtsov, G.M. Zinovjev
|
Limits of colour charge interaction in the instanton liquid
|
14 pages, 6 Postscript figures
| null | null | null |
hep-ph
| null |
The effect of external colour field impact on the instanton liquid is
studied. In the course of this study the corresponding effective Lagrangians
are derived for both regimes of weak and strong external field and in long
wave-length approximation. The example of Euclidean colour point-like source is
analyzed in detail and the feedback of field on the instanton liquid is
estimated as a function of source intensity.
|
[
{
"created": "Mon, 3 Oct 2005 06:18:13 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Molodtsov",
"S. V.",
""
],
[
"Zinovjev",
"G. M.",
""
]
] |
The effect of external colour field impact on the instanton liquid is studied. In the course of this study the corresponding effective Lagrangians are derived for both regimes of weak and strong external field and in long wave-length approximation. The example of Euclidean colour point-like source is analyzed in detail and the feedback of field on the instanton liquid is estimated as a function of source intensity.
|
1408.3995
|
Liang Tang
|
Cong-Feng Qiao, Liang Tang
|
Finding the $0^{--}$ Glueball
|
5 pages, 4 figures, 1 table, to appear in Phys. Rev. Lett
|
Phys. Rev. Lett. 113, 221601 (2014)
|
10.1103/PhysRevLett.113.221601
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With appropriate interpolating currents the mass spectrum of $0^{--}$ oddball
is obtained in the framework of QCD Sum Rules (QCDSR). We find there are two
stable oddballs with masses of $3.81 \pm 0.12 \, \text{GeV}$ and $4.33 \pm 0.13
\, \text{GeV}$, and analyze their possible production and decay modes in
experiments. Noticing that these $0^{--}$ oddballs with unconventional quantum
number are attainable in BESIII, BELLEII, PANDA, Super-B and LHCb experiments,
we believe the long search elusive glueball could be measured shortly.
|
[
{
"created": "Mon, 18 Aug 2014 12:47:41 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Oct 2014 13:05:38 GMT",
"version": "v2"
}
] |
2014-12-03
|
[
[
"Qiao",
"Cong-Feng",
""
],
[
"Tang",
"Liang",
""
]
] |
With appropriate interpolating currents the mass spectrum of $0^{--}$ oddball is obtained in the framework of QCD Sum Rules (QCDSR). We find there are two stable oddballs with masses of $3.81 \pm 0.12 \, \text{GeV}$ and $4.33 \pm 0.13 \, \text{GeV}$, and analyze their possible production and decay modes in experiments. Noticing that these $0^{--}$ oddballs with unconventional quantum number are attainable in BESIII, BELLEII, PANDA, Super-B and LHCb experiments, we believe the long search elusive glueball could be measured shortly.
|
1710.09785
|
Debojit Sarkar
|
Debojit Sarkar, Supriya Das and Subhasis Chattopadhyay
|
Investigating the radial flow like effects using identified triggered
correlation in pp collisions at $\sqrt{s}$ = 7 TeV
|
5 pages, 6 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An inclusive baryon to meson enhancement with increase in multiplicity has
been observed in pp collisions at $\sqrt{s}$= 7 TeV. Such a striking feature of
the data can be explained by approaches based on hydrodynamics and multi-parton
interactions (MPI) coupled with color reconnection (CR) mechanism. In this
paper, we investigate the multiplicity evolution of the charged particle yields
associated with pions and protons selected from the intermediate $p_{T}$ region
where the inclusive baryon to meson enhancement has been observed. The study
has been peformed using EPOS 3 (hydrodynamics) and PYTHIA 8 (MPI with CR) event
generators in pp collisions at 7 TeV. We find that the response of the
individual pion and proton triggered correlation towards these two mechanisms
is different and can be used to disentangle the effect of one from the other.
The current study can, therefore, provide important insights on the origin of
radial flow like effects in high multiplicity pp collisions at the LHC
energies.
|
[
{
"created": "Thu, 26 Oct 2017 16:12:16 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2018 16:57:31 GMT",
"version": "v2"
}
] |
2022-09-13
|
[
[
"Sarkar",
"Debojit",
""
],
[
"Das",
"Supriya",
""
],
[
"Chattopadhyay",
"Subhasis",
""
]
] |
An inclusive baryon to meson enhancement with increase in multiplicity has been observed in pp collisions at $\sqrt{s}$= 7 TeV. Such a striking feature of the data can be explained by approaches based on hydrodynamics and multi-parton interactions (MPI) coupled with color reconnection (CR) mechanism. In this paper, we investigate the multiplicity evolution of the charged particle yields associated with pions and protons selected from the intermediate $p_{T}$ region where the inclusive baryon to meson enhancement has been observed. The study has been peformed using EPOS 3 (hydrodynamics) and PYTHIA 8 (MPI with CR) event generators in pp collisions at 7 TeV. We find that the response of the individual pion and proton triggered correlation towards these two mechanisms is different and can be used to disentangle the effect of one from the other. The current study can, therefore, provide important insights on the origin of radial flow like effects in high multiplicity pp collisions at the LHC energies.
|
hep-ph/0611091
|
John Conley
|
John A. Conley and Tommer Wizansky
|
Microscopic primordial black holes and extra dimensions
|
19 pages, 6 figures
|
Phys.Rev.D75:044006,2007
|
10.1103/PhysRevD.75.044006
|
SLAC-PUB-12183
|
hep-ph
| null |
We examine the production and evolution of microscopic black holes in the
early universe in the large extra dimensions scenario. We demonstrate that,
unlike in the standard four-dimensional cosmology, in large extra dimensions
absorption of matter from the primordial plasma by the black holes is
significant and can lead to rapid growth of the black hole mass density. This
effect can be used to constrain the conditions present in the very early
universe. We demonstrate that this constraint is applicable in regions of
parameter space not excluded by existing bounds.
|
[
{
"created": "Tue, 7 Nov 2006 22:47:41 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2006 22:42:39 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Jan 2007 18:44:57 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Conley",
"John A.",
""
],
[
"Wizansky",
"Tommer",
""
]
] |
We examine the production and evolution of microscopic black holes in the early universe in the large extra dimensions scenario. We demonstrate that, unlike in the standard four-dimensional cosmology, in large extra dimensions absorption of matter from the primordial plasma by the black holes is significant and can lead to rapid growth of the black hole mass density. This effect can be used to constrain the conditions present in the very early universe. We demonstrate that this constraint is applicable in regions of parameter space not excluded by existing bounds.
|
hep-ph/9307312
| null |
Tadashi Kon, Tetsuro Kobayashi, Shoichi Kitamura, Keiichiro Nakamura
and Shunji Adachi
|
Signals for Scalar Top Quark at $ep$ Collider HERA
|
17 pages (revtex), 11 figures not included (available on request) ;
ITP-SU-93/03, TMU-HEL-9307
|
Z. Phys. C61 (1994) 239-246
|
10.1007/BF01413101
| null |
hep-ph
| null |
In the framework of the minimal supersymmetric standard model (MSSM) and the
R-parity breaking model (RBM), we investigate production processes of the
scalar top (stop) at HERA energies. These models are characterized by the
possible existence of the light stop whose mass is lighter than those of the
top quark and the other squarks. It is shown that in the MSSM the stop pair
production via boson-gluon fusion gives a sizeable cross section and the most
serious background $ep\rightarrow ec\bar{c}X$ could be suppressed by
appropriate kinematical cuts. We also show that in the RBM the stop is singly
produced in the neutral current processes and we have a clear signal as a sharp
peak in the Bjorken parameter $x$ distribution of the scattered electron.
|
[
{
"created": "Wed, 21 Jul 1993 19:34:21 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Kon",
"Tadashi",
""
],
[
"Kobayashi",
"Tetsuro",
""
],
[
"Kitamura",
"Shoichi",
""
],
[
"Nakamura",
"Keiichiro",
""
],
[
"Adachi",
"Shunji",
""
]
] |
In the framework of the minimal supersymmetric standard model (MSSM) and the R-parity breaking model (RBM), we investigate production processes of the scalar top (stop) at HERA energies. These models are characterized by the possible existence of the light stop whose mass is lighter than those of the top quark and the other squarks. It is shown that in the MSSM the stop pair production via boson-gluon fusion gives a sizeable cross section and the most serious background $ep\rightarrow ec\bar{c}X$ could be suppressed by appropriate kinematical cuts. We also show that in the RBM the stop is singly produced in the neutral current processes and we have a clear signal as a sharp peak in the Bjorken parameter $x$ distribution of the scattered electron.
|
1509.06817
|
Fabio Dahia
|
F. Dahia and A. S. Lemos
|
Constraints on extra dimensions from atomic spectroscopy
|
Version published in PRD
|
Phys. Rev. D 94, 084033 (2016)
|
10.1103/PhysRevD.94.084033
| null |
hep-ph gr-qc hep-th physics.atom-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a hydrogen atom confined in a thick brane embedded in a
higher-dimensional space. Due to effects of the extra dimensions, the
gravitational potential is amplified in distances smaller than the size of the
supplementary space, in comparison with the Newtonian potential. Studying the
influence of the gravitational interaction modified by the extra dimensions on
the energy levels of the hydrogen atom, we find independent constraints for the
higher-dimensional Planck mass in terms of the thickness of the brane by using
accurate measurements of atomic transition frequencies. The constraints are
very stringent for narrow branes.
|
[
{
"created": "Wed, 23 Sep 2015 00:51:42 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Dec 2016 15:57:07 GMT",
"version": "v2"
}
] |
2016-12-30
|
[
[
"Dahia",
"F.",
""
],
[
"Lemos",
"A. S.",
""
]
] |
We consider a hydrogen atom confined in a thick brane embedded in a higher-dimensional space. Due to effects of the extra dimensions, the gravitational potential is amplified in distances smaller than the size of the supplementary space, in comparison with the Newtonian potential. Studying the influence of the gravitational interaction modified by the extra dimensions on the energy levels of the hydrogen atom, we find independent constraints for the higher-dimensional Planck mass in terms of the thickness of the brane by using accurate measurements of atomic transition frequencies. The constraints are very stringent for narrow branes.
|
hep-ph/0206193
|
Joao Pulido
|
Bhag C. Chauhan, Joao Pulido (CFIF-IST Technical Univ. of Lisbon
Portugal)
|
Resonance Spin Flavour Precession of Solar Neutrinos After SNO NC Data
|
Latex, 16 pages, 3 eps figures
|
Phys.Rev. D66 (2002) 053006
|
10.1103/PhysRevD.66.053006
|
FISIST/13-2002/CFIF
|
hep-ph
| null |
We present an analysis of the solar neutrino data assuming the deficit of
solar neutrinos to be originated from the interaction of their transition
magnetic moments with the solar magnetic field. We perform fits to the rates
only and global fits and consider separately the existing data prior to the
announcement of the SNO NC results, and present data. Predictions for the
Borexino experiment are also derived. The solar field profiles are taken both
in the radiation zone and core of the sun, and in the convective zone. The
latter are chosen so as to exhibit a rapid increase across the bottom of the
convective zone and a moderate decrease towards the surface. Regarding the
field profiles in the radiative zone and core, it is found that the data show a
preference for those cases in which a strong field rests at the solar centre
with a steep decrease thereafter. For these, the quality of the global fits is
as good as the one from the best oscillation solutions and the same as for the
convective zone profiles examined. It is also found that the $\chi^2$ of the
fits increases when the most recent data are considered, owing to the smaller
errors involved. This in turn provides more precise predictions for Borexino
than previous ones, thus resulting in a clearer possible distinction between
magnetic moment and the currently favoured oscillation solutions.
|
[
{
"created": "Thu, 20 Jun 2002 15:30:39 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Chauhan",
"Bhag C.",
"",
"CFIF-IST Technical Univ. of Lisbon\n Portugal"
],
[
"Pulido",
"Joao",
"",
"CFIF-IST Technical Univ. of Lisbon\n Portugal"
]
] |
We present an analysis of the solar neutrino data assuming the deficit of solar neutrinos to be originated from the interaction of their transition magnetic moments with the solar magnetic field. We perform fits to the rates only and global fits and consider separately the existing data prior to the announcement of the SNO NC results, and present data. Predictions for the Borexino experiment are also derived. The solar field profiles are taken both in the radiation zone and core of the sun, and in the convective zone. The latter are chosen so as to exhibit a rapid increase across the bottom of the convective zone and a moderate decrease towards the surface. Regarding the field profiles in the radiative zone and core, it is found that the data show a preference for those cases in which a strong field rests at the solar centre with a steep decrease thereafter. For these, the quality of the global fits is as good as the one from the best oscillation solutions and the same as for the convective zone profiles examined. It is also found that the $\chi^2$ of the fits increases when the most recent data are considered, owing to the smaller errors involved. This in turn provides more precise predictions for Borexino than previous ones, thus resulting in a clearer possible distinction between magnetic moment and the currently favoured oscillation solutions.
|
hep-ph/9706227
|
Andrzej Czarnecki
|
Andrzej Czarnecki and Kirill Melnikov
|
Techniques for computing two-loop QCD corrections to b-->c transitions
|
22 pages, revtex
|
Phys. Rev. D 56, 7216 (1997)
|
10.1103/PhysRevD.56.7216
|
TTP97-20
|
hep-ph
| null |
We have recently presented the complete O(alpha_s^2) corrections to the
semileptonic decay width of the b quark at maximal recoil. Here we discuss
various technical aspects of that calculation and further applications of
similar methods. In particular, we describe an expansion which facilitates the
phase space integrations and the treatment of the mixed real-virtual
corrections, for which Taylor expansion does not work and the so-called eikonal
expansion must be employed. Several terms of the expansion are given for the
O(alpha_s^2) QCD corrections to the differential semileptonic decay width of
the b --quark at maximal recoil. We also demonstrate how the light quark loop
corrections to the top quark decay rate can be obtained using the same methods.
We briefly discuss the application of these techniques to the calculation of
the O(alpha_s^2) correction to zero recoil sum rules for heavy flavor
transitions.
|
[
{
"created": "Tue, 3 Jun 1997 12:51:04 GMT",
"version": "v1"
}
] |
2016-08-25
|
[
[
"Czarnecki",
"Andrzej",
""
],
[
"Melnikov",
"Kirill",
""
]
] |
We have recently presented the complete O(alpha_s^2) corrections to the semileptonic decay width of the b quark at maximal recoil. Here we discuss various technical aspects of that calculation and further applications of similar methods. In particular, we describe an expansion which facilitates the phase space integrations and the treatment of the mixed real-virtual corrections, for which Taylor expansion does not work and the so-called eikonal expansion must be employed. Several terms of the expansion are given for the O(alpha_s^2) QCD corrections to the differential semileptonic decay width of the b --quark at maximal recoil. We also demonstrate how the light quark loop corrections to the top quark decay rate can be obtained using the same methods. We briefly discuss the application of these techniques to the calculation of the O(alpha_s^2) correction to zero recoil sum rules for heavy flavor transitions.
|
2307.07252
|
Harleen Dahiya Dr.
|
Shubham Sharma and Harleen Dahiya
|
Analysis of the higher twist GTMD $F_{31}$ for proton in the light-front
quark-diquark model
|
5 pages. Presented in DIS2023: XXX International Workshop on
Deep-Inelastic Scattering and Related Subjects, Michigan State University,
USA, 27-31 March 2023
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the light-front quark-diquark model (LFQDM), the higher twist generalized
transverse momentum dependent distribution (GTMD) $F_{31}(x, {\bf p_\perp},{\bf
\Delta_\perp})$ for the proton has been analyzed. We have derived the GTMD
overlap equation by the analysis of GTMD correlator, employing the light-front
wave functions in both the scalar and vector diquark situations. With the
relevant 2-D and 3-D figures, the behavior of GTMD $F_{31}(x, {\bf
p_\perp},{\bf \Delta_\perp})$ with variations in its variables has been
illustrated. Further, on applying the transverse momentum dependent
distribution (TMD) limit on GTMD $F_{31}(x, {\bf p_\perp},{\bf \Delta_\perp})$,
the expression of TMD $f_3(x, {\bf p_\perp})$ has been obtained.
|
[
{
"created": "Fri, 14 Jul 2023 09:55:39 GMT",
"version": "v1"
}
] |
2023-07-17
|
[
[
"Sharma",
"Shubham",
""
],
[
"Dahiya",
"Harleen",
""
]
] |
In the light-front quark-diquark model (LFQDM), the higher twist generalized transverse momentum dependent distribution (GTMD) $F_{31}(x, {\bf p_\perp},{\bf \Delta_\perp})$ for the proton has been analyzed. We have derived the GTMD overlap equation by the analysis of GTMD correlator, employing the light-front wave functions in both the scalar and vector diquark situations. With the relevant 2-D and 3-D figures, the behavior of GTMD $F_{31}(x, {\bf p_\perp},{\bf \Delta_\perp})$ with variations in its variables has been illustrated. Further, on applying the transverse momentum dependent distribution (TMD) limit on GTMD $F_{31}(x, {\bf p_\perp},{\bf \Delta_\perp})$, the expression of TMD $f_3(x, {\bf p_\perp})$ has been obtained.
|
1501.07272
|
Matti Jarvinen
|
Matti Jarvinen
|
Massive holographic QCD in the Veneziano limit
|
66+43 pages, 23 figures. v2: Section 3 clarified, minor corrections,
comments and references added
|
JHEP 1507 (2015) 033
|
10.1007/JHEP07(2015)033
|
CCTP-2015-03, CCQCN-2015-61
|
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
QCD at finite, flavor independent quark mass is analyzed by using bottom-up
holography in the Veneziano limit, where the backreaction of quarks to the
gluon dynamics is fully included. The dependence on the quark mass of
observables such as the bound state masses, the chiral condensate, the
S-parameter, and the critical temperatures is studied. Many of the results are
argued to be universal, i.e., independent of the details of the holographic
model, and compared to explicit computations in the V-QCD models. The effect of
adding four-fermion operators in QCD is also discussed.
|
[
{
"created": "Wed, 28 Jan 2015 21:00:07 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2015 22:39:08 GMT",
"version": "v2"
}
] |
2015-10-07
|
[
[
"Jarvinen",
"Matti",
""
]
] |
QCD at finite, flavor independent quark mass is analyzed by using bottom-up holography in the Veneziano limit, where the backreaction of quarks to the gluon dynamics is fully included. The dependence on the quark mass of observables such as the bound state masses, the chiral condensate, the S-parameter, and the critical temperatures is studied. Many of the results are argued to be universal, i.e., independent of the details of the holographic model, and compared to explicit computations in the V-QCD models. The effect of adding four-fermion operators in QCD is also discussed.
|
2202.11466
|
Kazem Azizi
|
U. \"Ozdem, K. Azizi
|
Magnetic moment of the $X_1(2900)$ state in the diquark-antidiquark
picture
|
7 Pages and 1 Figure
| null |
10.1140/epja/s10050-022-00815-6
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
Motivated by the discovery of fully open-flavor tetraquark states $X_0(2900)$
and $X_1(2900)$ by the LHCb Collaboration, the magnetic dipole moment of the
$X_1(2900)$ state with the quantum numbers $ J^{P} = 1^{-}$ is determined in
the diquark-antidiquark picture using the light-cone sum rules. The numerical
result is obtained as $ \mu_{X_1}=0.79^{+0.36}_{-0.39}\,\mu_N$. The magnetic
moments of hadrons encompasses useful knowledge on the distributions of charge
and magnetization their inside, which can be used to better understand their
geometrical shapes and quark-gluon organizations. The observation of the
$X_0(2900)$ and $X_1(2900)$ as the first two fully open-flavor multiquark
states has opened a new window for investigation of the exotic states. The
obtained results in the present study may shed light on the future experimental
and theoretical searches on the properties of fully open-flavor multiquark
states.
|
[
{
"created": "Wed, 23 Feb 2022 12:39:42 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jul 2022 07:15:13 GMT",
"version": "v2"
}
] |
2022-09-21
|
[
[
"Özdem",
"U.",
""
],
[
"Azizi",
"K.",
""
]
] |
Motivated by the discovery of fully open-flavor tetraquark states $X_0(2900)$ and $X_1(2900)$ by the LHCb Collaboration, the magnetic dipole moment of the $X_1(2900)$ state with the quantum numbers $ J^{P} = 1^{-}$ is determined in the diquark-antidiquark picture using the light-cone sum rules. The numerical result is obtained as $ \mu_{X_1}=0.79^{+0.36}_{-0.39}\,\mu_N$. The magnetic moments of hadrons encompasses useful knowledge on the distributions of charge and magnetization their inside, which can be used to better understand their geometrical shapes and quark-gluon organizations. The observation of the $X_0(2900)$ and $X_1(2900)$ as the first two fully open-flavor multiquark states has opened a new window for investigation of the exotic states. The obtained results in the present study may shed light on the future experimental and theoretical searches on the properties of fully open-flavor multiquark states.
|
hep-ph/9708432
|
Soo-Jong Rey
|
Chi-Keung Chow and Soo-Jong Rey
|
Quenched and Partially Quenched Chiral Perturbation Theory for Vector
and Tensor Mesons
|
Latex, 21 pages, 3 figures, several improved discussions added
Ref-no.: CLNS 97/1506, IASSNS-HEP 87-89, SNUTP 97-102
|
Nucl.Phys. B528 (1998) 303-321
|
10.1016/S0550-3213(98)00313-7
| null |
hep-ph hep-lat
| null |
Quenched and partially quenched chiral perturbation theory for vector mesons
is developed and is used to extract chiral loop correction to the $\rho$ meson
mass. Connections to fully quenched and totally unquenched chiral perturbation
theory results are discussed. It is also shown that (partially) quenched
perturbation theory for tensor mesons can be formulated analogously, and the
chiral corrections for tensor meson masses are directly proportional to their
counterparts in the vector meson sector. Utilizing this observation and
non-relativistic quark model, we point out that mass difference $(m_{a_2} - {3
\over 2} m_\rho)$ is ``quenching-insensitive'' in large-$N_c$ limit. This
quantity may be used for normalization of mass scale in lattice QCD
calculations.
|
[
{
"created": "Fri, 22 Aug 1997 00:09:42 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 1998 10:26:51 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Mar 1998 02:12:02 GMT",
"version": "v3"
}
] |
2009-10-30
|
[
[
"Chow",
"Chi-Keung",
""
],
[
"Rey",
"Soo-Jong",
""
]
] |
Quenched and partially quenched chiral perturbation theory for vector mesons is developed and is used to extract chiral loop correction to the $\rho$ meson mass. Connections to fully quenched and totally unquenched chiral perturbation theory results are discussed. It is also shown that (partially) quenched perturbation theory for tensor mesons can be formulated analogously, and the chiral corrections for tensor meson masses are directly proportional to their counterparts in the vector meson sector. Utilizing this observation and non-relativistic quark model, we point out that mass difference $(m_{a_2} - {3 \over 2} m_\rho)$ is ``quenching-insensitive'' in large-$N_c$ limit. This quantity may be used for normalization of mass scale in lattice QCD calculations.
|
1603.06350
|
Bhavesh Chauhan
|
Bhavesh Chauhan, and Subhendra Mohanty
|
Constraints on leptophilic light dark matter from internal heat flux of
Earth
|
Journal version to appear in Phys Rev D
|
Phys. Rev. D 94, 035024 (2016)
|
10.1103/PhysRevD.94.035024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark Matter in Earth intersecting orbits can scatter off the electrons and
lose energy, and finally be gravitationally bound to Earth. Eventually they
lose enough energy and accumulate at the core. It is assumed that DM
annihilates/decays predominantly into Standard Model particles inside Earth.
The heat flux from these processes is compared with the experimentally measured
value of internal heat flux of Earth which is 44 TW. Assuming steady state
between capture and annihilation/decay, we put constraints on the scattering
cross section of DM with electrons as a function of their mass. For low mass
regions ($<10^{-2}$GeV), these constraints on leptophilic DM are better than
ones obtained from direct-detection experiments.
|
[
{
"created": "Mon, 21 Mar 2016 08:22:34 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2016 14:21:59 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Jul 2016 18:11:09 GMT",
"version": "v3"
}
] |
2016-08-31
|
[
[
"Chauhan",
"Bhavesh",
""
],
[
"Mohanty",
"Subhendra",
""
]
] |
Dark Matter in Earth intersecting orbits can scatter off the electrons and lose energy, and finally be gravitationally bound to Earth. Eventually they lose enough energy and accumulate at the core. It is assumed that DM annihilates/decays predominantly into Standard Model particles inside Earth. The heat flux from these processes is compared with the experimentally measured value of internal heat flux of Earth which is 44 TW. Assuming steady state between capture and annihilation/decay, we put constraints on the scattering cross section of DM with electrons as a function of their mass. For low mass regions ($<10^{-2}$GeV), these constraints on leptophilic DM are better than ones obtained from direct-detection experiments.
|
1212.2635
|
Andrey Katz
|
Nathaniel Craig and Andrey Katz
|
A Supersymmetric Higgs Sector with Chiral D-terms
|
19 pages, 2 figures
| null |
10.1007/JHEP05(2013)015
|
RUNHETC-2012-23
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although supersymmetry remains the best candidate for solving the electroweak
hierarchy problem, a supersymmetric Higgs boson near 125 GeV requires heavy
scalars, highly-mixed stops, or non-minimal contributions to the Higgs
potential. Extensions of the Standard Model (SM) gauge group provide an
attractive means of raising the Higgs mass through non-decoupling D-term
contributions to the Higgs quartic, but in most cases this correction is
correlated with an enhanced coupling to bottom quarks and tau leptons that is
disfavored by current fits to LHC Higgs data. In this work we demonstrate that
the Higgs mass may be raised by non-decoupling D-terms without such enhanced
couplings if the two supersymmetric Higgs doublets are "chiral", i.e., charged
under different gauge groups at high energies. In this case there is no direct
correlation between the correction to the Higgs mass and its couplings to SM
states, and in general the chiral correction to the Higgs potential undoes the
MSSM preference for enhanced bottom couplings. This raises the prospects for
discovering additional supersymmetric Higgs bosons consistent with the measured
mass and couplings of the observed Higgs.
|
[
{
"created": "Tue, 11 Dec 2012 21:00:03 GMT",
"version": "v1"
}
] |
2015-06-12
|
[
[
"Craig",
"Nathaniel",
""
],
[
"Katz",
"Andrey",
""
]
] |
Although supersymmetry remains the best candidate for solving the electroweak hierarchy problem, a supersymmetric Higgs boson near 125 GeV requires heavy scalars, highly-mixed stops, or non-minimal contributions to the Higgs potential. Extensions of the Standard Model (SM) gauge group provide an attractive means of raising the Higgs mass through non-decoupling D-term contributions to the Higgs quartic, but in most cases this correction is correlated with an enhanced coupling to bottom quarks and tau leptons that is disfavored by current fits to LHC Higgs data. In this work we demonstrate that the Higgs mass may be raised by non-decoupling D-terms without such enhanced couplings if the two supersymmetric Higgs doublets are "chiral", i.e., charged under different gauge groups at high energies. In this case there is no direct correlation between the correction to the Higgs mass and its couplings to SM states, and in general the chiral correction to the Higgs potential undoes the MSSM preference for enhanced bottom couplings. This raises the prospects for discovering additional supersymmetric Higgs bosons consistent with the measured mass and couplings of the observed Higgs.
|
1204.4125
|
Stefan Leupold
|
C. Terschlusen (Uppsala U.), S. Leupold (Uppsala U.), M. F. M. Lutz
(GSI, Darmstadt)
|
Electromagnetic transitions in an effective chiral Lagrangian with the
eta-prime and light vector mesons
|
17 pages, extended discussion on mixing
| null |
10.1140/epja/i2012-12190-6
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the chiral Lagrangian with a nonet of Goldstone bosons and a
nonet of light vector mesons. The mixing between the pseudoscalar mesons eta
and eta-prime is taken into account. A novel counting scheme is suggested that
is based on hadrogenesis, which conjectures a mass gap in the meson spectrum of
QCD in the limit of a large number of colors. Such a mass gap would justify to
consider the vector mesons and the eta-prime meson as light degrees of freedom.
The complete leading order Lagrangian is constructed and discussed. As a first
application it is tested against electromagnetic transitions of light vector
mesons to pseudoscalar mesons. Our parameters are determined by the
experimental data on photon decays of the omega, phi and eta-prime meson. In
terms of such parameters we predict the corresponding decays into virtual
photons with either dielectrons or dimuons in the final state.
|
[
{
"created": "Wed, 18 Apr 2012 16:25:40 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Oct 2012 11:13:19 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Terschlusen",
"C.",
"",
"Uppsala U."
],
[
"Leupold",
"S.",
"",
"Uppsala U."
],
[
"Lutz",
"M. F. M.",
"",
"GSI, Darmstadt"
]
] |
We consider the chiral Lagrangian with a nonet of Goldstone bosons and a nonet of light vector mesons. The mixing between the pseudoscalar mesons eta and eta-prime is taken into account. A novel counting scheme is suggested that is based on hadrogenesis, which conjectures a mass gap in the meson spectrum of QCD in the limit of a large number of colors. Such a mass gap would justify to consider the vector mesons and the eta-prime meson as light degrees of freedom. The complete leading order Lagrangian is constructed and discussed. As a first application it is tested against electromagnetic transitions of light vector mesons to pseudoscalar mesons. Our parameters are determined by the experimental data on photon decays of the omega, phi and eta-prime meson. In terms of such parameters we predict the corresponding decays into virtual photons with either dielectrons or dimuons in the final state.
|
hep-ph/9711311
|
Carlo Giunti
|
S.M. Bilenky, C. Giunti, W. Grimus
|
Neutrino mixing from neutrino oscillation data
|
15 pages, including 4 figures. Talk presented by S.M. Bilenky at the
Erice School on Nuclear Physics, 19th course "Neutrinos in Astro, Particle
and Nuclear Physics", 16-24 September 1997
|
Prog.Part.Nucl.Phys. 40 (1998) 219-228
|
10.1016/S0146-6410(98)00028-3
|
IASSNS-AST 97/63, UWThPh-1997-43, DFTT 67/97
|
hep-ph
| null |
We show that the existing neutrino oscillation data are in favour of the
schemes with mixing of four massive neutrinos and that only two of these
schemes, with two pairs of neutrinos with close masses separated by a gap of
about 1 eV, are compatible with all data. Possible implications of these
schemes for future experiments are discussed.
|
[
{
"created": "Thu, 13 Nov 1997 09:58:44 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Bilenky",
"S. M.",
""
],
[
"Giunti",
"C.",
""
],
[
"Grimus",
"W.",
""
]
] |
We show that the existing neutrino oscillation data are in favour of the schemes with mixing of four massive neutrinos and that only two of these schemes, with two pairs of neutrinos with close masses separated by a gap of about 1 eV, are compatible with all data. Possible implications of these schemes for future experiments are discussed.
|
1505.02176
|
Alper Hayreter
|
Alper Hayreter and German Valencia
|
Spin correlations and new physics in $\tau$-lepton decays at the LHC
|
25 pages, 11 figures, 14 tables. v2: added two subsections and
relevant discussions, corresponds to version to be published at JHEP
| null |
10.1007/JHEP07(2015)174
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use spin correlations to constrain anomalous $\tau$-lepton couplings at
the LHC including its anomalous magnetic moment, electric dipole moment and
weak dipole moments. Single spin correlations are ideal to probe interference
terms between the SM and new dipole-type couplings as they are not suppressed
by the $\tau$-lepton mass. Double spin asymmetries give rise to $T$-odd
correlations useful to probe $CP$ violation purely within the new physics
amplitudes, as their appearance from interference with the SM is suppressed by
$m_\tau$. We compare our constraints to those obtained earlier on the basis of
deviations from the Drell-Yan cross-section.
|
[
{
"created": "Fri, 8 May 2015 20:41:09 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 2015 18:17:07 GMT",
"version": "v2"
}
] |
2015-09-02
|
[
[
"Hayreter",
"Alper",
""
],
[
"Valencia",
"German",
""
]
] |
We use spin correlations to constrain anomalous $\tau$-lepton couplings at the LHC including its anomalous magnetic moment, electric dipole moment and weak dipole moments. Single spin correlations are ideal to probe interference terms between the SM and new dipole-type couplings as they are not suppressed by the $\tau$-lepton mass. Double spin asymmetries give rise to $T$-odd correlations useful to probe $CP$ violation purely within the new physics amplitudes, as their appearance from interference with the SM is suppressed by $m_\tau$. We compare our constraints to those obtained earlier on the basis of deviations from the Drell-Yan cross-section.
|
2103.03477
|
Arnab Chaudhuri
|
Arnab Chaudhuri and Maxim Yu. Khlopov
|
Entropy production due to electroweak phase transition in the framework
of two Higgs doublet model
|
15 pages, 1 figure
| null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We revisit the possibility of first order electroweak phase transition~(EWPT)
in one of the simplest extensions of the Standard Model (SM) scalar sector,
namely the two-Higgs-doublet model~(2HDM). We take into account the ensuing
constraints from the electroweak precision tests, Higgs signal strengths, and
the recent LHC bounds from direct scalar searches. By studying the vacuum
transition in 2HDM, we discuss in detail the entropy released in the first
order EWPT in various parameter planes of 2HDM.
|
[
{
"created": "Fri, 5 Mar 2021 05:25:33 GMT",
"version": "v1"
}
] |
2021-03-08
|
[
[
"Chaudhuri",
"Arnab",
""
],
[
"Khlopov",
"Maxim Yu.",
""
]
] |
We revisit the possibility of first order electroweak phase transition~(EWPT) in one of the simplest extensions of the Standard Model (SM) scalar sector, namely the two-Higgs-doublet model~(2HDM). We take into account the ensuing constraints from the electroweak precision tests, Higgs signal strengths, and the recent LHC bounds from direct scalar searches. By studying the vacuum transition in 2HDM, we discuss in detail the entropy released in the first order EWPT in various parameter planes of 2HDM.
|
1408.2921
|
Giulia Pancheri Dr.
|
D.A. Fagundes, A. Grau, G. Pancheri, Y.N. Srivastava and O.
Shekhovtsova
|
p-air production cross-section and uncorrelated mini-jets processes in
pp-scattering
|
7 pages, 5 figures, to appear in Proceedings of ISMD2014, 8-12
September 2014, Bologna, Italy
| null |
10.1051/epjconf/20159003002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For the p-air production cross-section, we use a Glauber formalism which
inputs the pp inelastic cross-section from a mini-jet model embedded in a
single-channel eikonal expression, which provides the needed contribution of
uncorrelated processes. It is then shown that current LO parton density
functions for the pp mini-jet cross-sections, with a rise tempered by
collinearity induced by soft gluon re-summation, are well suited to reproduce
recent cosmic ray results. By comparing results for GRV, MRST72 and MSTW
parametrizations, we estimate the uncertainty related to the low-x behavior of
these densities.
|
[
{
"created": "Wed, 13 Aug 2014 06:21:02 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2014 13:52:15 GMT",
"version": "v2"
}
] |
2015-06-22
|
[
[
"Fagundes",
"D. A.",
""
],
[
"Grau",
"A.",
""
],
[
"Pancheri",
"G.",
""
],
[
"Srivastava",
"Y. N.",
""
],
[
"Shekhovtsova",
"O.",
""
]
] |
For the p-air production cross-section, we use a Glauber formalism which inputs the pp inelastic cross-section from a mini-jet model embedded in a single-channel eikonal expression, which provides the needed contribution of uncorrelated processes. It is then shown that current LO parton density functions for the pp mini-jet cross-sections, with a rise tempered by collinearity induced by soft gluon re-summation, are well suited to reproduce recent cosmic ray results. By comparing results for GRV, MRST72 and MSTW parametrizations, we estimate the uncertainty related to the low-x behavior of these densities.
|
hep-ph/0207277
|
Apostolos Pilaftsis
|
Apostolos Pilaftsis
|
Higgs-Mediated Electric Dipole Moments in the MSSM: An Application to
Baryogenesis and Higgs Searches
|
34 pages, one reference added, version as to appear in Nuclear
Physics B
|
Nucl.Phys. B644 (2002) 263-289
|
10.1016/S0550-3213(02)00826-X
|
CERN-TH/2002-170 and MC-TH-2002-03
|
hep-ph
| null |
We perform a comprehensive study of the dominant two- and higher-loop
contributions to the $^{205}$Tl, neutron and muon electric dipole moments
induced by Higgs bosons, third-generation quarks and squarks, charginos and
gluinos in the Minimal Supersymmetric Standard Model (MSSM). We find that
strong correlations exist among the contributing CP-violating operators, for
large stop, gluino and chargino phases, and for a wide range of values of
$\tan\beta$ and charged Higgs-boson masses, giving rise to large suppressions
of the $^{205}$Tl and neutron electric dipole moments below their present
experimental limits. Based on this observation, we discuss the constraints that
the non-observation of electric dipole moments imposes on the
radiatively-generated CP-violating Higgs sector and on the mechanism of
electroweak baryogenesis in the MSSM. We improve previously suggested benchmark
scenarios of maximal CP violation for analyzing direct searches of CP-violating
MSSM Higgs bosons at high-energy colliders, and stress the important
complementary r\^ole that a possible high-sensitivity measurement of the muon
electric dipole moment to the level of $10^{-24}$ $e$ cm can play in such
analyses.
|
[
{
"created": "Tue, 23 Jul 2002 12:32:09 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2002 19:05:47 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jul 2002 23:43:59 GMT",
"version": "v3"
},
{
"created": "Wed, 2 Oct 2002 17:56:23 GMT",
"version": "v4"
}
] |
2010-04-05
|
[
[
"Pilaftsis",
"Apostolos",
""
]
] |
We perform a comprehensive study of the dominant two- and higher-loop contributions to the $^{205}$Tl, neutron and muon electric dipole moments induced by Higgs bosons, third-generation quarks and squarks, charginos and gluinos in the Minimal Supersymmetric Standard Model (MSSM). We find that strong correlations exist among the contributing CP-violating operators, for large stop, gluino and chargino phases, and for a wide range of values of $\tan\beta$ and charged Higgs-boson masses, giving rise to large suppressions of the $^{205}$Tl and neutron electric dipole moments below their present experimental limits. Based on this observation, we discuss the constraints that the non-observation of electric dipole moments imposes on the radiatively-generated CP-violating Higgs sector and on the mechanism of electroweak baryogenesis in the MSSM. We improve previously suggested benchmark scenarios of maximal CP violation for analyzing direct searches of CP-violating MSSM Higgs bosons at high-energy colliders, and stress the important complementary r\^ole that a possible high-sensitivity measurement of the muon electric dipole moment to the level of $10^{-24}$ $e$ cm can play in such analyses.
|
1907.02550
|
Javier Fuentes-Mart\'in
|
Javier Fuentes-Martin, Mario Reig, Avelino Vicente
|
Strong CP problem with low-energy emergent QCD: The 4321 case
|
6 pages, 3 figures. v2: Minor changes in the discussion. Conclusions
unchanged. v3: New title. Matching the journal version
|
Phys. Rev. D 100, 115028 (2019)
|
10.1103/PhysRevD.100.115028
|
ZU-TH-36/19, IFIC/19-31
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the strong CP problem and the implications for axion physics in
the context of $U_1$ vector leptoquark models, recently put forward as an
elegant solution to the hints of lepton flavor universality violation in
B-meson decays. It is shown that in minimal gauge models containing the $U_1$
as a gauge boson, the Peccei-Quinn solution of the strong CP problem requires
the introduction of two axions. Characteristic predictions for the associated
axions can be deduced from the model parameter space hinted by B-physics,
allowing the new axion sector to account for the dark matter of the Universe.
We also provide a specific ultraviolet completion of the axion sector that
connects the Peccei-Quinn mechanism to the generation of neutrino masses.
|
[
{
"created": "Thu, 4 Jul 2019 18:09:38 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Jul 2019 11:24:10 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Dec 2019 12:08:39 GMT",
"version": "v3"
}
] |
2019-12-25
|
[
[
"Fuentes-Martin",
"Javier",
""
],
[
"Reig",
"Mario",
""
],
[
"Vicente",
"Avelino",
""
]
] |
We analyze the strong CP problem and the implications for axion physics in the context of $U_1$ vector leptoquark models, recently put forward as an elegant solution to the hints of lepton flavor universality violation in B-meson decays. It is shown that in minimal gauge models containing the $U_1$ as a gauge boson, the Peccei-Quinn solution of the strong CP problem requires the introduction of two axions. Characteristic predictions for the associated axions can be deduced from the model parameter space hinted by B-physics, allowing the new axion sector to account for the dark matter of the Universe. We also provide a specific ultraviolet completion of the axion sector that connects the Peccei-Quinn mechanism to the generation of neutrino masses.
|
hep-ph/0403073
|
Yuriy Mishchenko
|
Chueng-Ryong Ji and Yuriy Mishchenko
|
Time-to-space conversion in quantum field theory of flavor mixing
| null |
Annals Phys. 315 (2005) 488-504
|
10.1016/j.aop.2004.09.004
| null |
hep-ph
| null |
We consider the problem of time-to-space conversion in quantum field theory
of flavor mixing using a generalization of the wave-packet method in quantum
mechanics. We work entirely within the canonical formalism of creation and
annihilation operators that allows us, unlike the usual wave-packet
formulation, to include the nontrivial effect due to flavor condensation in the
vacuum.
|
[
{
"created": "Sun, 7 Mar 2004 01:36:15 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Ji",
"Chueng-Ryong",
""
],
[
"Mishchenko",
"Yuriy",
""
]
] |
We consider the problem of time-to-space conversion in quantum field theory of flavor mixing using a generalization of the wave-packet method in quantum mechanics. We work entirely within the canonical formalism of creation and annihilation operators that allows us, unlike the usual wave-packet formulation, to include the nontrivial effect due to flavor condensation in the vacuum.
|
hep-ph/9711450
|
Ho Meoyng Choi
|
Ho-Meoyng Choi and Chueng-Ryong Ji(NCSU)
|
Mixing angles and electromagnetic properties of ground state
pseudoscalar and vector meson nonets in the light-cone quark model
|
22 pages, 10 figures, to appear in Phys. Rev. D
|
Phys.Rev. D59 (1999) 074015
|
10.1103/PhysRevD.59.074015
| null |
hep-ph
| null |
Both the mass spectra and the wave functions of the light pseudoscalar
($\pi,K,\eta,\eta'$) and vector($\rho,K^{*},\omega,\phi$) mesons are analyzed
within the framework of the light-cone constituent quark model. A gaussian
radial wave function is used as a trial function of the variational principle
for a QCD motivated Hamiltonian which includes not only the Coulomb plus
confining potential but also the hyperfine interaction to obtain the correct
$\rho-\pi$ splitting. For the confining potential, we use (1) harmonic
oscillator potential and (2) linear potential and compare the numerical results
for these two cases. The mixing angles of $\omega-\phi$ and $\eta-\eta'$ are
predicted and various physical observables such as decay constants, charge
radii, and radiative decay rates $etc.$ are calculated. Our numerical results
in two cases (1) and (2) are overall not much different from each other and
have a good agreement with the available experimental data. use (1) harmonic
oscillator potential and (2) linear potential and compare the numerical results
for these two cases. The mixing angles of $\omega-\phi$ and $\eta-\eta'$ are
predicted and various physical observables such as decay constants, charge
radii, and radiative decay rates $etc.$ are calculated. Our numerical results
in two cases (1) and (2) are overall not much different from each other and
have a good agreement with the available experimental data.
|
[
{
"created": "Mon, 24 Nov 1997 22:11:33 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 1997 03:56:53 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Nov 1997 05:17:20 GMT",
"version": "v3"
},
{
"created": "Sat, 13 Jun 1998 19:31:34 GMT",
"version": "v4"
},
{
"created": "Fri, 8 Jan 1999 04:06:17 GMT",
"version": "v5"
}
] |
2009-10-30
|
[
[
"Choi",
"Ho-Meoyng",
"",
"NCSU"
],
[
"Ji",
"Chueng-Ryong",
"",
"NCSU"
]
] |
Both the mass spectra and the wave functions of the light pseudoscalar ($\pi,K,\eta,\eta'$) and vector($\rho,K^{*},\omega,\phi$) mesons are analyzed within the framework of the light-cone constituent quark model. A gaussian radial wave function is used as a trial function of the variational principle for a QCD motivated Hamiltonian which includes not only the Coulomb plus confining potential but also the hyperfine interaction to obtain the correct $\rho-\pi$ splitting. For the confining potential, we use (1) harmonic oscillator potential and (2) linear potential and compare the numerical results for these two cases. The mixing angles of $\omega-\phi$ and $\eta-\eta'$ are predicted and various physical observables such as decay constants, charge radii, and radiative decay rates $etc.$ are calculated. Our numerical results in two cases (1) and (2) are overall not much different from each other and have a good agreement with the available experimental data. use (1) harmonic oscillator potential and (2) linear potential and compare the numerical results for these two cases. The mixing angles of $\omega-\phi$ and $\eta-\eta'$ are predicted and various physical observables such as decay constants, charge radii, and radiative decay rates $etc.$ are calculated. Our numerical results in two cases (1) and (2) are overall not much different from each other and have a good agreement with the available experimental data.
|
hep-ph/9709494
|
Carlo Giunti
|
C. Giunti, C.W. Kim, U.W. Lee
|
When do neutrinos cease to oscillate?
|
10 pages, no figures
|
Phys.Lett. B421 (1998) 237-244
|
10.1016/S0370-2693(98)00014-8
|
KIAS-P97003, DFTT 55/97
|
hep-ph
| null |
In order to investigate when neutrinos cease to oscillate in the framework of
quantum field theory, we have reexamined the wave packet treatment of neutrino
oscillations by taking different sizes of the wave packets of the particles
involved in the production and detection processes. The treatment is shown to
be considerably simplified by using the Grimus-Stockinger theorem which enables
us to carry out the integration over the momentum of the propagating neutrino.
Our new results confirm the recent observation by Kiers, Nussinov and Weiss
that a precise measurement of the energies of the particles involved in the
detection process would increase the coherence length. We also present a
precise definition of the coherence length beyond which neutrinos cease to
oscillate.
|
[
{
"created": "Mon, 29 Sep 1997 15:24:38 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Giunti",
"C.",
""
],
[
"Kim",
"C. W.",
""
],
[
"Lee",
"U. W.",
""
]
] |
In order to investigate when neutrinos cease to oscillate in the framework of quantum field theory, we have reexamined the wave packet treatment of neutrino oscillations by taking different sizes of the wave packets of the particles involved in the production and detection processes. The treatment is shown to be considerably simplified by using the Grimus-Stockinger theorem which enables us to carry out the integration over the momentum of the propagating neutrino. Our new results confirm the recent observation by Kiers, Nussinov and Weiss that a precise measurement of the energies of the particles involved in the detection process would increase the coherence length. We also present a precise definition of the coherence length beyond which neutrinos cease to oscillate.
|
hep-ph/9905237
|
Jos Vermaseren
|
E. Remiddi and J. A. M. Vermaseren
|
Harmonic Polylogarithms
|
18 pages LaTeX
|
Int.J.Mod.Phys. A15 (2000) 725-754
|
10.1142/S0217751X00000367
|
NIKHEF-99-005 and TTP99-08
|
hep-ph
| null |
The harmonic polylogarithms (hpl's) are introduced. They are a generalization
of Nielsen's polylogarithms, satisfying a product algebra (the product of two
hpl's is in turn a combination of hpl's) and forming a set closed under the
transformation of the arguments x=1/z and x=(1-t)/(1+t). The coefficients of
their expansions and their Mellin transforms are harmonic sums.
|
[
{
"created": "Tue, 4 May 1999 13:03:18 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Remiddi",
"E.",
""
],
[
"Vermaseren",
"J. A. M.",
""
]
] |
The harmonic polylogarithms (hpl's) are introduced. They are a generalization of Nielsen's polylogarithms, satisfying a product algebra (the product of two hpl's is in turn a combination of hpl's) and forming a set closed under the transformation of the arguments x=1/z and x=(1-t)/(1+t). The coefficients of their expansions and their Mellin transforms are harmonic sums.
|
1708.06689
|
Raghunath Sahoo
|
Pragati Sahoo, Swatantra Kumar Tiwari, Sudipan De, Raghunath Sahoo,
Rolf P. Scharenberg, and Brijesh K. Srivastava
|
Thermodynamic and transport properties in Au + Au collisions at RHIC
energies from the clustering of color strings
|
Same as published version in MPLA
|
Modern Physics Letters A 34 (2019) 1950034
|
10.1142/S0217732319500342
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we have extracted the initial tempearture from the transverse
momentum spectra of charged particles in $Au+Au$ collisions using STAR data at
RHIC energies from $\sqrt{s_{NN}}$ = 7.7 to 200 GeV. The initial energy density
($\varepsilon$), shear viscosity to entropy density ratio ($\eta/s$), trace
anomaly ($\Delta$), the squared speed of sound ($C_s^2$), entropy density, and
bulk viscosity to entropy density ratio ($\zeta/s$) are obtained and compared
with the lattice QCD calculations for (2+1) flavor. The initial temperatures
obtained are compared with various hadronization and chemical freeze-out
temperatures. The analysis of the data shows that the deconfinement to
confinement transition possibly takes place between $\sqrt{s_{NN}}$ = 11.5 and
19.6 GeV.
|
[
{
"created": "Tue, 22 Aug 2017 16:00:41 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2019 14:23:05 GMT",
"version": "v2"
}
] |
2019-01-30
|
[
[
"Sahoo",
"Pragati",
""
],
[
"Tiwari",
"Swatantra Kumar",
""
],
[
"De",
"Sudipan",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Scharenberg",
"Rolf P.",
""
],
[
"Srivastava",
"Brijesh K.",
""
]
] |
In this work, we have extracted the initial tempearture from the transverse momentum spectra of charged particles in $Au+Au$ collisions using STAR data at RHIC energies from $\sqrt{s_{NN}}$ = 7.7 to 200 GeV. The initial energy density ($\varepsilon$), shear viscosity to entropy density ratio ($\eta/s$), trace anomaly ($\Delta$), the squared speed of sound ($C_s^2$), entropy density, and bulk viscosity to entropy density ratio ($\zeta/s$) are obtained and compared with the lattice QCD calculations for (2+1) flavor. The initial temperatures obtained are compared with various hadronization and chemical freeze-out temperatures. The analysis of the data shows that the deconfinement to confinement transition possibly takes place between $\sqrt{s_{NN}}$ = 11.5 and 19.6 GeV.
|
hep-ph/0201086
|
Taizan Watari
|
T.Watari and T.Yanagida
|
Higher Dimensional Supersymmetry as an Origin of the Three Families for
Quarks and Leptons
|
12 pages, Contribution to "Peccei Fest" January 11-13,2002, a number
of comments and an appendix are added
|
Phys.Lett.B532:252-258,2002
|
10.1016/S0370-2693(02)01536-8
| null |
hep-ph hep-th
| null |
In a (0,1) supersymmetric (SUSY) six-dimensional gauge theory, a gauge
fermion gives rise to box anomalies. These anomalies are completely canceled by
assuming a vector multiplet of (1,1) SUSY. With a T^2/Z_3 orbifold
compactification of the extra two dimensional space, the theory provides three
chiral multiplets and three equivalent fixed points. We regard them as the
origin of the three families of quarks and leptons. Quasi anarchy structure in
the SU(5)-5^* representation sector and hence the bimaximal mixing in the
neutrino oscillation are explained quite naturally in this framework. We also
discuss a family symmetry as a remnant of the higher-dimensional R symmetry.
|
[
{
"created": "Fri, 11 Jan 2002 03:26:43 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2002 08:43:54 GMT",
"version": "v2"
},
{
"created": "Thu, 9 May 2002 19:27:15 GMT",
"version": "v3"
}
] |
2017-08-23
|
[
[
"Watari",
"T.",
""
],
[
"Yanagida",
"T.",
""
]
] |
In a (0,1) supersymmetric (SUSY) six-dimensional gauge theory, a gauge fermion gives rise to box anomalies. These anomalies are completely canceled by assuming a vector multiplet of (1,1) SUSY. With a T^2/Z_3 orbifold compactification of the extra two dimensional space, the theory provides three chiral multiplets and three equivalent fixed points. We regard them as the origin of the three families of quarks and leptons. Quasi anarchy structure in the SU(5)-5^* representation sector and hence the bimaximal mixing in the neutrino oscillation are explained quite naturally in this framework. We also discuss a family symmetry as a remnant of the higher-dimensional R symmetry.
|
1201.6189
|
Stefano Morisi
|
Anupam Mazumdar and Stefano Morisi
|
Split neutrinos - leptogenesis, dark matter and inflation
|
5 pages, 1 figure
| null |
10.1103/PhysRevD.86.045031
|
IFIC/12-05
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a simple framework to split neutrinos with a slight departure from
tribimaximal mixing - where two of the neutrinos are Majorana type which
provide thermal leptogenesis. The Dirac neutrino with a tiny Yukawa coupling
explains primordial inflation and the cosmic microwave background radiation,
where the inflaton is the gauge invariant flat direction. The observed baryon
asymmetry, and the scale of inflation are intimately tied to the observed
reactor angle, which can be further constrained by the LHC and the neutrinoless
double beta decay experiments. The model also provides the lightest right
handed sneutrino as a part of the inflaton to be the dark matter candidate.
|
[
{
"created": "Mon, 30 Jan 2012 12:13:00 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Mazumdar",
"Anupam",
""
],
[
"Morisi",
"Stefano",
""
]
] |
We propose a simple framework to split neutrinos with a slight departure from tribimaximal mixing - where two of the neutrinos are Majorana type which provide thermal leptogenesis. The Dirac neutrino with a tiny Yukawa coupling explains primordial inflation and the cosmic microwave background radiation, where the inflaton is the gauge invariant flat direction. The observed baryon asymmetry, and the scale of inflation are intimately tied to the observed reactor angle, which can be further constrained by the LHC and the neutrinoless double beta decay experiments. The model also provides the lightest right handed sneutrino as a part of the inflaton to be the dark matter candidate.
|
hep-ph/0607243
|
Nicolas Chatillon
|
N. Chatillon and A. Pinzul
|
Light Propagation in a Background Field for Time-Space Noncommutativity
and Axionic Noncommutative QED
|
15 pages. References added
|
Nucl.Phys.B764:95-108,2007
|
10.1016/j.nuclphysb.2006.12.003
|
SU-4252-834
|
hep-ph hep-th
| null |
We study the low-energy effects of space-time non-commutativity on light
propagation in a background electromagnetic field. Contrary to some of the
previous claims, we find no polarization rotation for vanishing time-space
commutator $[\hat{x}^i,\hat{x}^0]= 0$, although dispersion relation is
modified, allowing for propagation faster than the vacuum speed of light. For
non-zero $[\hat{x}^i,\hat{x}^0]$, as allowed with a proper quantization, a
naive rotation effect is found to be actually absent when physical fields are
defined through Seiberg-Witten map. We also consider non-commutative QED weakly
coupled to small mass particles such as axions. Non-commutativity is found to
dominate the inverse oscillation length, compared to axion mass and QED
effects, for mixing particle masses smaller than $10^{-12} eV$. Conventional
constraints on axion coupling based on photon-axion transition rates are
unmodified, however induced ellipticity is proportional to the
non-commutativity squared length scale. This last effect is found to be too
small to account for the ellipticity reported by the PVLAS experiment, yet
unexplained by conventional QED or axion physics.
|
[
{
"created": "Fri, 21 Jul 2006 14:56:52 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Jul 2006 04:40:58 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Chatillon",
"N.",
""
],
[
"Pinzul",
"A.",
""
]
] |
We study the low-energy effects of space-time non-commutativity on light propagation in a background electromagnetic field. Contrary to some of the previous claims, we find no polarization rotation for vanishing time-space commutator $[\hat{x}^i,\hat{x}^0]= 0$, although dispersion relation is modified, allowing for propagation faster than the vacuum speed of light. For non-zero $[\hat{x}^i,\hat{x}^0]$, as allowed with a proper quantization, a naive rotation effect is found to be actually absent when physical fields are defined through Seiberg-Witten map. We also consider non-commutative QED weakly coupled to small mass particles such as axions. Non-commutativity is found to dominate the inverse oscillation length, compared to axion mass and QED effects, for mixing particle masses smaller than $10^{-12} eV$. Conventional constraints on axion coupling based on photon-axion transition rates are unmodified, however induced ellipticity is proportional to the non-commutativity squared length scale. This last effect is found to be too small to account for the ellipticity reported by the PVLAS experiment, yet unexplained by conventional QED or axion physics.
|
1911.05923
|
Yadir Alexander Garnica Garz\'on
|
Y. A. Garnica, S.F. Mantilla, R. Martinez, H. Vargas
|
From Peccei Quinn symmetry to mass hierarchy problem
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a non-universal $\mathrm{U}(1)_{X}$ gauge extension to the
Standard Model (SM) and an additional Peccei-Quinn (PQ) global symmetry to
study the mass hierarchy and strong CP problem. The scheme allows us to
distinguish among fermion families and to generate the fermionic mass spectrum
of particles of the SM. The symmetry breaking is performed by two scalar Higgs
doublets and two scalar Higgs singlets, where one of these has the axion which
turns out to be a candidate for Cold Dark Matter. The exotic sector is composed
by one up-like $T$ and two down-like $J^{1,2}$ heavy quarks, two heavy charged
leptons $E,\mathcal{E}$, one additional right-handed neutrino per family
$\nu_{R}^{e,\mu,\tau}$, and an invisible axion $a$. In addition, the large
energy scale associated to the breaking of the PQ-symmetry gives masses to the
right-handed neutrinos in such a way that the active neutrinos acquire eV-mass
values due to the see-saw mechanism. On the other hand, from the non-linear
effective Lagrangian, the flavour changing of the down quarks and charged
leptons with the axion are considered.
|
[
{
"created": "Thu, 14 Nov 2019 03:53:55 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 2020 18:41:21 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Apr 2020 03:57:36 GMT",
"version": "v3"
},
{
"created": "Sat, 15 May 2021 19:06:25 GMT",
"version": "v4"
}
] |
2021-05-18
|
[
[
"Garnica",
"Y. A.",
""
],
[
"Mantilla",
"S. F.",
""
],
[
"Martinez",
"R.",
""
],
[
"Vargas",
"H.",
""
]
] |
We propose a non-universal $\mathrm{U}(1)_{X}$ gauge extension to the Standard Model (SM) and an additional Peccei-Quinn (PQ) global symmetry to study the mass hierarchy and strong CP problem. The scheme allows us to distinguish among fermion families and to generate the fermionic mass spectrum of particles of the SM. The symmetry breaking is performed by two scalar Higgs doublets and two scalar Higgs singlets, where one of these has the axion which turns out to be a candidate for Cold Dark Matter. The exotic sector is composed by one up-like $T$ and two down-like $J^{1,2}$ heavy quarks, two heavy charged leptons $E,\mathcal{E}$, one additional right-handed neutrino per family $\nu_{R}^{e,\mu,\tau}$, and an invisible axion $a$. In addition, the large energy scale associated to the breaking of the PQ-symmetry gives masses to the right-handed neutrinos in such a way that the active neutrinos acquire eV-mass values due to the see-saw mechanism. On the other hand, from the non-linear effective Lagrangian, the flavour changing of the down quarks and charged leptons with the axion are considered.
|
2408.04021
|
Marios Galanis
|
Asimina Arvanitaki and Savas Dimopoulos and Marios Galanis
|
Superradiant Interactions of the Cosmic Neutrino Background, Axions,
Dark Matter, and Reactor Neutrinos
|
32+4 pages, 2 appendices, 8 figures and 5 tables
| null | null | null |
hep-ph astro-ph.CO hep-th quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper we do three things. First, we outline the conditions under
which the interaction rate of inelastic processes that change the internal
state of a system of $N$ targets scales as $N^2$. This is an effect distinct
from coherent elastic scattering, but with the same scaling. Second, we compute
example rates for such processes for various weakly interacting particles.
Finally, we point to potential quantum observables for these processes that go
beyond traditional energy exchange.
Maximal coherence in inelastic processes is achieved when the targets are
placed in an equal superposition of the ground and excited states. These
coherent inelastic processes are analogous to Dicke superradiance, and we thus
refer to them as superradiant interactions.
We compute the superradiant interaction rates for the C$\nu$B, dark matter
scattering and absorption, and late-universe particles, such as reactor
neutrinos, when the two-level system is realized by nuclear or electron spins
in a magnetic field. The rates we find can be quite sizable on macroscopic yet
small targets. For example, the C$\nu$B interacts with a rate of
$\mathcal{O}(\text{Hz})$ when scattering off a 10~cm liquid or solid-state
density spin-polarized sphere. For QCD axion dark matter, similar rates can be
achieved with much smaller samples, $N \sim
\mathcal{O}(10^{15})\left(\frac{m}{2\times 10^{-8}~\text{eV}}\right)^{-1/2}$,
where $m$ is the axion mass.
Using the Lindblad formalism for open quantum systems, we show that these
superradiant interactions can manifest as a source of noise on the system. This
points to new observables, sensitive to the sum of the excitation and
de-excitation rates, and can be viewed as introducing diffusion and decoherence
to the system. The effects presented in this paper may point to a new class of
ultra-low threshold detectors.
|
[
{
"created": "Wed, 7 Aug 2024 18:08:31 GMT",
"version": "v1"
}
] |
2024-08-09
|
[
[
"Arvanitaki",
"Asimina",
""
],
[
"Dimopoulos",
"Savas",
""
],
[
"Galanis",
"Marios",
""
]
] |
In this paper we do three things. First, we outline the conditions under which the interaction rate of inelastic processes that change the internal state of a system of $N$ targets scales as $N^2$. This is an effect distinct from coherent elastic scattering, but with the same scaling. Second, we compute example rates for such processes for various weakly interacting particles. Finally, we point to potential quantum observables for these processes that go beyond traditional energy exchange. Maximal coherence in inelastic processes is achieved when the targets are placed in an equal superposition of the ground and excited states. These coherent inelastic processes are analogous to Dicke superradiance, and we thus refer to them as superradiant interactions. We compute the superradiant interaction rates for the C$\nu$B, dark matter scattering and absorption, and late-universe particles, such as reactor neutrinos, when the two-level system is realized by nuclear or electron spins in a magnetic field. The rates we find can be quite sizable on macroscopic yet small targets. For example, the C$\nu$B interacts with a rate of $\mathcal{O}(\text{Hz})$ when scattering off a 10~cm liquid or solid-state density spin-polarized sphere. For QCD axion dark matter, similar rates can be achieved with much smaller samples, $N \sim \mathcal{O}(10^{15})\left(\frac{m}{2\times 10^{-8}~\text{eV}}\right)^{-1/2}$, where $m$ is the axion mass. Using the Lindblad formalism for open quantum systems, we show that these superradiant interactions can manifest as a source of noise on the system. This points to new observables, sensitive to the sum of the excitation and de-excitation rates, and can be viewed as introducing diffusion and decoherence to the system. The effects presented in this paper may point to a new class of ultra-low threshold detectors.
|
hep-ph/0307327
|
Xu Qing-Hua
|
Qing-hua Xu, and Zuo-tang Liang (Shandong University)
|
Spin alignment of vector mesons in unpolarized hadron-hadron collisions
at high energies
|
submitted to Phys. Rev . D
|
Phys.Rev. D68 (2003) 034023
|
10.1103/PhysRevD.68.034023
| null |
hep-ph
| null |
We argue that spin alignment of the vector mesons observed in unpolarized
hadron-hadron collisions is closely related to the single spin left-right
asymmetry observed in transversely polarized hadron-hadron collisions. We
present the numerical results obtained from the type of spin-correlation
imposed by the existence of the single-spin left-right asymmetries. We compare
the results with the available data and make predictions for future
experiments.
|
[
{
"created": "Sat, 26 Jul 2003 10:32:33 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Xu",
"Qing-hua",
"",
"Shandong University"
],
[
"Liang",
"Zuo-tang",
"",
"Shandong University"
]
] |
We argue that spin alignment of the vector mesons observed in unpolarized hadron-hadron collisions is closely related to the single spin left-right asymmetry observed in transversely polarized hadron-hadron collisions. We present the numerical results obtained from the type of spin-correlation imposed by the existence of the single-spin left-right asymmetries. We compare the results with the available data and make predictions for future experiments.
|
hep-ph/9510313
|
H. N. Li
|
Chung-Yi Wu, Tsung-Wen Yeh and Hsiang-nan Li
|
Perturbative QCD study of $B\to D^{(*)}$ decays
|
19 pages in Latex, 7 figures in ps
|
Phys.Rev.D53:4982-4990,1996
|
10.1103/PhysRevD.53.4982
|
CCUTH-95-05
|
hep-ph
| null |
We compute various form factors involved in $B\to D^{(*)}$ transitions based
on the perturbative QCD formalism, which includes Sudakov effects from the
resummation of large radiative corrections in a heavy-light system. A
two-parameter model wave function for $D^{(*)}$ mesons is fixed using data of
the nonleptonic decays $B\to D^{(*)}\pi$, from which the ratio of the decay
constants $f_{D^*}/f_D=0.92$ is obtained. We then derive the spectrum of the
semileptonic decay $B\to D^{*}\ell\nu$ in the fast recoil region of the $D^*$
meson, and extract the CKM matrix element $|V_{cb}|=0.043\times(0.12 {\rm
GeV}/f_B)\times(0.14 {\rm GeV}/f_D)$, $f_B$ and $f_D$ being the $B$ and $D$
meson decay constants, respectively. Here we adopt the convention with the pion
decay constant $f_\pi=93$ MeV. With these outcomes, we evaluate the decay rate
of $B\to DD_s$, and estimate the ratio $f_{D_s}/f_D=0.98$ from data.
Contributions of internal $W$-emission and $W$-exchange diagrams are briefly
discussed.
|
[
{
"created": "Tue, 17 Oct 1995 22:39:00 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 1995 22:13:15 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Wu",
"Chung-Yi",
""
],
[
"Yeh",
"Tsung-Wen",
""
],
[
"Li",
"Hsiang-nan",
""
]
] |
We compute various form factors involved in $B\to D^{(*)}$ transitions based on the perturbative QCD formalism, which includes Sudakov effects from the resummation of large radiative corrections in a heavy-light system. A two-parameter model wave function for $D^{(*)}$ mesons is fixed using data of the nonleptonic decays $B\to D^{(*)}\pi$, from which the ratio of the decay constants $f_{D^*}/f_D=0.92$ is obtained. We then derive the spectrum of the semileptonic decay $B\to D^{*}\ell\nu$ in the fast recoil region of the $D^*$ meson, and extract the CKM matrix element $|V_{cb}|=0.043\times(0.12 {\rm GeV}/f_B)\times(0.14 {\rm GeV}/f_D)$, $f_B$ and $f_D$ being the $B$ and $D$ meson decay constants, respectively. Here we adopt the convention with the pion decay constant $f_\pi=93$ MeV. With these outcomes, we evaluate the decay rate of $B\to DD_s$, and estimate the ratio $f_{D_s}/f_D=0.98$ from data. Contributions of internal $W$-emission and $W$-exchange diagrams are briefly discussed.
|
1410.1288
|
Tan Z.G.
|
Z. G. Tan, C. B. Yang
|
Hadron formation from interaction among quarks
|
8 pages, 4 figures
|
Int. J. Mod. E, May 27, 2015 16:6 WSPC/S0218-3013
|
10.1142/S0218301315500445
| null |
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
This paper deals with the hadronization process of quark system. A
phenomenological potential is introduced to describe the interaction between a
quark pair. The potential depends on the color charge of those quarks and their
relative distances. Those quarks move according to classical equations of
motion. Due to the color interaction, coloring quarks are separated to form
color neutral clusters which are supposed to be the hadrons.
|
[
{
"created": "Mon, 6 Oct 2014 09:00:44 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Tan",
"Z. G.",
""
],
[
"Yang",
"C. B.",
""
]
] |
This paper deals with the hadronization process of quark system. A phenomenological potential is introduced to describe the interaction between a quark pair. The potential depends on the color charge of those quarks and their relative distances. Those quarks move according to classical equations of motion. Due to the color interaction, coloring quarks are separated to form color neutral clusters which are supposed to be the hadrons.
|
hep-ph/0101010
|
Erler
|
Jens Erler and Mingxing Luo
|
Hadronic Loop Corrections to the Muon Anomalous Magnetic Moment
|
4 pages
|
Phys.Rev.Lett. 87 (2001) 071804
|
10.1103/PhysRevLett.87.071804
|
UPR-921-T
|
hep-ph
| null |
The dominant theoretical uncertainties in both, the anomalous magnetic moment
of the muon and the value of the electromagnetic coupling at the Z scale arise
from their hadronic contributions. Since these will ultimately dominate the
experimental errors, we study the correlation between them, as well as with
other fundamental parameters. To this end we present analytical formulas for
the QCD contribution from higher energies and from heavy quarks. Including
these correlations affects the Higgs boson mass extracted from precision data.
|
[
{
"created": "Sun, 31 Dec 2000 19:13:29 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2001 15:03:02 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Jun 2001 23:11:59 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Erler",
"Jens",
""
],
[
"Luo",
"Mingxing",
""
]
] |
The dominant theoretical uncertainties in both, the anomalous magnetic moment of the muon and the value of the electromagnetic coupling at the Z scale arise from their hadronic contributions. Since these will ultimately dominate the experimental errors, we study the correlation between them, as well as with other fundamental parameters. To this end we present analytical formulas for the QCD contribution from higher energies and from heavy quarks. Including these correlations affects the Higgs boson mass extracted from precision data.
|
1603.02037
|
Ipsita Saha
|
Debajyoti Choudhury, Dilip Kumar Ghosh, Santosh Kumar Rai, Ipsita Saha
|
Little Higgs after the little one
|
22 pages, 3 captioned figures, 8 Tables; minor modifications, version
published in JHEP
| null |
10.1007/JHEP06(2016)074
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
At the LHC, the Littlest Higgs Model with $T$-parity is characterised by
various production channels. If the $T$-odd quarks are heavier than the exotic
partners of the $W$ and the $Z$, then associated production can be as important
as the pair-production of the former. Studying both, we look for final states
comprising at least one lepton, jets and missing transverse energy. We consider
all the SM processes that could conspire to contribute as background to our
signals, and perform a full detector level simulation of the signal and
background to estimate the discovery potential at the current run as well as at
the scheduled upgrade of the LHC. We also show that, for one of the channels,
the reconstruction of two tagged $b$-jets at the Higgs mass $(M_h = 125~{\rm
GeV})$ provides us with an unambiguous hint for this model.
|
[
{
"created": "Mon, 7 Mar 2016 12:50:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2016 07:53:45 GMT",
"version": "v2"
}
] |
2016-06-29
|
[
[
"Choudhury",
"Debajyoti",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Rai",
"Santosh Kumar",
""
],
[
"Saha",
"Ipsita",
""
]
] |
At the LHC, the Littlest Higgs Model with $T$-parity is characterised by various production channels. If the $T$-odd quarks are heavier than the exotic partners of the $W$ and the $Z$, then associated production can be as important as the pair-production of the former. Studying both, we look for final states comprising at least one lepton, jets and missing transverse energy. We consider all the SM processes that could conspire to contribute as background to our signals, and perform a full detector level simulation of the signal and background to estimate the discovery potential at the current run as well as at the scheduled upgrade of the LHC. We also show that, for one of the channels, the reconstruction of two tagged $b$-jets at the Higgs mass $(M_h = 125~{\rm GeV})$ provides us with an unambiguous hint for this model.
|
hep-ph/9608217
|
Ruggero Barni
|
L. Dick, V. Karapetian (1), R. Barni, G. Preparata (2) ((1) Cern, (2)
University of Milano)
|
Diffractive Deep Inelastic Scattering: the hadronic nature of Quarks
|
13 pag., Latex 2.09 (or 2e), 5 figures in separate .eps files
|
Phys.Lett. B408 (1997) 427-434
|
10.1016/S0370-2693(97)00896-4
|
MITH 96/4
|
hep-ph
| null |
In the framework of Anisotropic Chromo Dynamics, a non-perturbative model of
QCD based on magnetic condensation in the vacuum, we develope a picture of the
Pomeron. Within this model we are able to calculate the diffractive
contribution to deep inelastic scattering in the small Bjorken x region,
actually probed at Hera. We calculate the diffractive structure function of the
proton and make the comparison with the experimental data of Zeus and H1
collaborations. Good agreement with the experimental data, both for the
diffractive structure function $F_2^D$ and for the ''structure function'' of
the Pomeron, is achieved.
|
[
{
"created": "Fri, 2 Aug 1996 15:01:31 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Dick",
"L.",
""
],
[
"Karapetian",
"V.",
""
],
[
"Barni",
"R.",
""
],
[
"Preparata",
"G.",
""
]
] |
In the framework of Anisotropic Chromo Dynamics, a non-perturbative model of QCD based on magnetic condensation in the vacuum, we develope a picture of the Pomeron. Within this model we are able to calculate the diffractive contribution to deep inelastic scattering in the small Bjorken x region, actually probed at Hera. We calculate the diffractive structure function of the proton and make the comparison with the experimental data of Zeus and H1 collaborations. Good agreement with the experimental data, both for the diffractive structure function $F_2^D$ and for the ''structure function'' of the Pomeron, is achieved.
|
hep-ph/9608263
|
Michiyasu Nagasawa
|
Michiyasu Nagasawa and Jun'ichi Yokoyama (YITP, Kyoto University)
|
Are nontopological strings produced at the electroweak phase transition?
|
12 pages (REVTeX), no figure, Physical Review Letters in press
|
Phys.Rev.Lett. 77 (1996) 2166-2169
|
10.1103/PhysRevLett.77.2166
|
YITP-96-19
|
hep-ph
| null |
We formulate a local condition for a nontopological defect to be present. We
apply it for electroweak strings and estimate the probability of their
existence at the Ginzburg temperature. As a result we find strings long enough
to serve for baryon-number generation are unlikely to be produced.
|
[
{
"created": "Thu, 8 Aug 1996 05:58:27 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Nagasawa",
"Michiyasu",
"",
"YITP, Kyoto University"
],
[
"Yokoyama",
"Jun'ichi",
"",
"YITP, Kyoto University"
]
] |
We formulate a local condition for a nontopological defect to be present. We apply it for electroweak strings and estimate the probability of their existence at the Ginzburg temperature. As a result we find strings long enough to serve for baryon-number generation are unlikely to be produced.
|
2203.09534
|
Sebastian Zell
|
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
|
Field redefinitions, perturbative unitarity and Higgs inflation
|
24 pages; v2: small improvements and updated references, matches
published version
|
JHEP 06 (2022) 132
|
10.1007/JHEP06(2022)132
|
LMU-ASC 12/22
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For inflation driven by the Higgs field coupled non-minimally to gravity, we
study the cutoff energy scale above which perturbation theory breaks down.
Employing the metric formulation, we first give an overview of known results
and then provide a new way to calculate a lower bound on the cutoff. Our
approach neither relies on a gauge choice nor does it require any calculation
of amplitudes. Instead, it exploits the fact that the S-matrix is invariant
under field redefinitions. In agreement with previous findings, we demonstrate
that the cutoff is significantly higher during inflation than in vacuum, which
ensures the robustness of semi-classical predictions. Along the way, we
generalize our findings to the Palatini formulation and comment on a useful
parametrization of the Higgs doublet in both scenarios.
|
[
{
"created": "Thu, 17 Mar 2022 18:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2023 18:01:38 GMT",
"version": "v2"
}
] |
2023-07-18
|
[
[
"Karananas",
"Georgios K.",
""
],
[
"Shaposhnikov",
"Mikhail",
""
],
[
"Zell",
"Sebastian",
""
]
] |
For inflation driven by the Higgs field coupled non-minimally to gravity, we study the cutoff energy scale above which perturbation theory breaks down. Employing the metric formulation, we first give an overview of known results and then provide a new way to calculate a lower bound on the cutoff. Our approach neither relies on a gauge choice nor does it require any calculation of amplitudes. Instead, it exploits the fact that the S-matrix is invariant under field redefinitions. In agreement with previous findings, we demonstrate that the cutoff is significantly higher during inflation than in vacuum, which ensures the robustness of semi-classical predictions. Along the way, we generalize our findings to the Palatini formulation and comment on a useful parametrization of the Higgs doublet in both scenarios.
|
1803.00171
|
Takaaki Nomura
|
Chuan-Hung Chen, Takaaki Nomura
|
Charged Higgs boson contribution to $B^-_{q} \to \ell \bar \nu$ and
$\bar B\to (P, V) \ell \bar\nu$ in a generic two-Higgs doublet model
|
53 pages, 13 figures, version accepted for publication in Physical
Review D
|
Phys. Rev. D 98, 095007 (2018)
|
10.1103/PhysRevD.98.095007
|
KIAS-P18018
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We comprehensively study the charged-Higgs contributions to the leptonic
$B^-_q \to \ell \bar \nu$ ($q=u,c$) and semileptonic $\bar B \to X_q \ell
\bar\nu$ ($X_u=\pi, \rho; X_c=D,D^*$) decays in the type-III two-Higgs-doublet
model (2HDM). We employ the Cheng-Sher ansatz to suppress the tree-level
flavor-changing neutral currents (FCNCs) in the quark sector. When the strict
constraints from the $\Delta B=2$ and $b\to s \gamma$ processes are considered,
parameters $\chi^u_{tq}$ from the quark couplings and $\chi^\ell_\ell$ from the
lepton couplings dictate the leptonic and semileptonic $B$ decays. It is found
that when the measured $B^-_u\to \tau \bar \nu$ and indirect bound of $B^-_c
\to \tau \bar \nu$ obtained by LEP1 data are taken into account, $R(D)$ and
$R(\pi)$ can have broadly allowed ranges; however, the values of $R(\rho)$ and
$R(D^*)$ are limited to approximately the standard model (SM) results. We also
find that the same behaviors also occur in the $\tau$-lepton polarizations and
forward-backward asymmetries ($A^{X_q,\tau}_{FB}$) of the semileptonic decays,
with the exception of $A^{D^*,\tau}_{FB}$, for which the deviation from the SM
due to the charged-Higgs effect is still sizable. In addition, the
$q^2$-dependent $A^{\pi,\tau}_{FB}$ and $A^{D,\tau}_{FB}$ can be very sensitive
to the charged-Higgs effects and have completely different shapes from the SM.
|
[
{
"created": "Thu, 1 Mar 2018 02:26:46 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Nov 2018 12:56:47 GMT",
"version": "v2"
}
] |
2018-11-14
|
[
[
"Chen",
"Chuan-Hung",
""
],
[
"Nomura",
"Takaaki",
""
]
] |
We comprehensively study the charged-Higgs contributions to the leptonic $B^-_q \to \ell \bar \nu$ ($q=u,c$) and semileptonic $\bar B \to X_q \ell \bar\nu$ ($X_u=\pi, \rho; X_c=D,D^*$) decays in the type-III two-Higgs-doublet model (2HDM). We employ the Cheng-Sher ansatz to suppress the tree-level flavor-changing neutral currents (FCNCs) in the quark sector. When the strict constraints from the $\Delta B=2$ and $b\to s \gamma$ processes are considered, parameters $\chi^u_{tq}$ from the quark couplings and $\chi^\ell_\ell$ from the lepton couplings dictate the leptonic and semileptonic $B$ decays. It is found that when the measured $B^-_u\to \tau \bar \nu$ and indirect bound of $B^-_c \to \tau \bar \nu$ obtained by LEP1 data are taken into account, $R(D)$ and $R(\pi)$ can have broadly allowed ranges; however, the values of $R(\rho)$ and $R(D^*)$ are limited to approximately the standard model (SM) results. We also find that the same behaviors also occur in the $\tau$-lepton polarizations and forward-backward asymmetries ($A^{X_q,\tau}_{FB}$) of the semileptonic decays, with the exception of $A^{D^*,\tau}_{FB}$, for which the deviation from the SM due to the charged-Higgs effect is still sizable. In addition, the $q^2$-dependent $A^{\pi,\tau}_{FB}$ and $A^{D,\tau}_{FB}$ can be very sensitive to the charged-Higgs effects and have completely different shapes from the SM.
|
hep-ph/9512416
| null |
Pran Nath and R.Arnowitt
|
Supersymmetric Dark Matter
|
latex file 11 pages, and 2 figs.The figs can be faxed on
request.Based on talks at SUSY95 at Ecole Polytechnique, Palaiseau,95 and at
the Pascos/ Hopkins Symposium at the John Hopkins, Baltimore, Maryland,95
| null | null |
NSF-ITP-95-110;NUB-TH-3127;CTP-TAMU-34/95
|
hep-ph
| null |
A review of supersymmetric dark matter in minimal supergravity unification
with R-parity invariance and with radiative breaking of the electro-weak
symmetry is given. The analysis shows the lightest neutralino is the LSP over
most of the parameter space of the supergravity model. The event rates in
neutralino- nucleus scattering in dark matter detectors are also discussed.It
is found that the event rates are sensititive to the constraint from the
$b\rightarrow s\gamma$ experiment.It is also found that the event rates are
sensitive to the constraints of relic density and in our analysis we have used
the accurate method for the computation of the neutralino relic density.
Finally,the effect of the new results on quark polarizabilities, from the data
of the Spin Muon Collaboration, on event rates is also discussed.The analysis
shows that the event rates for the Ge detectors and for other detectors which
use heavy targets are only negligibly affected.
|
[
{
"created": "Sun, 24 Dec 1995 21:41:34 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nath",
"Pran",
""
],
[
"Arnowitt",
"R.",
""
]
] |
A review of supersymmetric dark matter in minimal supergravity unification with R-parity invariance and with radiative breaking of the electro-weak symmetry is given. The analysis shows the lightest neutralino is the LSP over most of the parameter space of the supergravity model. The event rates in neutralino- nucleus scattering in dark matter detectors are also discussed.It is found that the event rates are sensititive to the constraint from the $b\rightarrow s\gamma$ experiment.It is also found that the event rates are sensitive to the constraints of relic density and in our analysis we have used the accurate method for the computation of the neutralino relic density. Finally,the effect of the new results on quark polarizabilities, from the data of the Spin Muon Collaboration, on event rates is also discussed.The analysis shows that the event rates for the Ge detectors and for other detectors which use heavy targets are only negligibly affected.
|
hep-ph/9511377
|
Homayoun Hamidian
|
H. Hamidian, S. Jaimungal, G.W. Semenoff, P. Suranyi, L.C.R.
Wijewardhana
|
Gauged Yukawa Matrix Models and 2-Dimensional Lattice Theories
|
LaTeX, 11 pages
|
Phys.Rev. D53 (1996) 5886-5890
|
10.1103/PhysRevD.53.5886
| null |
hep-ph hep-th
| null |
We argue that chiral symmetry breaking in three dimensional QCD can be
identified with N\'eel order in 2-dimensional quantum antiferromagnets. When
operators which drive the chiral transition are added to these theories, we
postulate that the resulting quantum critical behavior is in the universality
class of gauged Yukawa matrix models. As a consequence, the chiral transition
is typically of first order, although for a limited class of parameters it can
be second order with computable critical exponents.
|
[
{
"created": "Mon, 20 Nov 1995 22:26:43 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Hamidian",
"H.",
""
],
[
"Jaimungal",
"S.",
""
],
[
"Semenoff",
"G. W.",
""
],
[
"Suranyi",
"P.",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] |
We argue that chiral symmetry breaking in three dimensional QCD can be identified with N\'eel order in 2-dimensional quantum antiferromagnets. When operators which drive the chiral transition are added to these theories, we postulate that the resulting quantum critical behavior is in the universality class of gauged Yukawa matrix models. As a consequence, the chiral transition is typically of first order, although for a limited class of parameters it can be second order with computable critical exponents.
|
hep-ph/9602294
| null |
A.D. Dolgov
|
Neutrinos in Cosmology
|
18 pages, latex twice; invited talk at TAUP95, Toledo, Spain
|
Nucl.Phys.Proc.Suppl.48:5-12,1996
|
10.1016/0920-5632(96)00197-1
|
FTUV/96-08, IFIC/96-09, ITEP 6-96
|
hep-ph astro-ph
| null |
Cosmological implications of neutrinos are reviewed. The subjects considered
involve: (a) bounds on neutrino mass from the observational limits on the
universe age and the Hubble constant both in cosmology with and without
cosmological constant; (b) distortion of spectrum of cosmic neutrinos; (c)
bounds on neutrino mass from primordial nucleosynthesis; (d) lepton asymmetry
of the universe; (e) neutrino oscillations and possible new sterile neutrinos;
(f) neutrino role in large scale structure formation.
|
[
{
"created": "Tue, 13 Feb 1996 16:11:49 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dolgov",
"A. D.",
""
]
] |
Cosmological implications of neutrinos are reviewed. The subjects considered involve: (a) bounds on neutrino mass from the observational limits on the universe age and the Hubble constant both in cosmology with and without cosmological constant; (b) distortion of spectrum of cosmic neutrinos; (c) bounds on neutrino mass from primordial nucleosynthesis; (d) lepton asymmetry of the universe; (e) neutrino oscillations and possible new sterile neutrinos; (f) neutrino role in large scale structure formation.
|
2007.08132
|
Suman Kumbhakar
|
Suman Kumbhakar
|
Signatures of complex new physics in $b\to c\tau\bar{\nu}$ transitions
|
18 pages, 5 figures, Accepted for publication in Nucl. Phys. B
|
Nucl. Phys. B 963 (2021) 115297
|
10.1016/j.nuclphysb.2020.115297
| null |
hep-ph hep-ex
|
http://creativecommons.org/publicdomain/zero/1.0/
|
The anomalies in the measurements of $R_D$ and $R_{D^*}$ continue to provide
motivation for physics beyond the Standard Model. In this work, we assume the
new physics Wilson coefficients to be complex and find their values by doing a
global fit to the present $b\rightarrow c\tau\bar{\nu}$ data. We find that the
number of allowed solutions depend on the choice of the upper limit on
$Br(B_c\rightarrow \tau\bar{\nu})$. We find that the forward-backward
asymmetries in $B\rightarrow (D, D^*)\tau\bar{\nu}$ decays have the capability
to distinguish between different solutions. Further we calculate the maximum
values of CP violating triple product asymmetries in $B\to D^*\tau\bar{\nu}$
decay allowed the current data. We observe that only one of the three CP
asymmetries can be enhanced up to a maximum value of $\sim 2-3\%$ whereas the
other asymmetries remain smaller.
|
[
{
"created": "Thu, 16 Jul 2020 06:13:14 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Dec 2020 02:15:05 GMT",
"version": "v2"
}
] |
2021-01-06
|
[
[
"Kumbhakar",
"Suman",
""
]
] |
The anomalies in the measurements of $R_D$ and $R_{D^*}$ continue to provide motivation for physics beyond the Standard Model. In this work, we assume the new physics Wilson coefficients to be complex and find their values by doing a global fit to the present $b\rightarrow c\tau\bar{\nu}$ data. We find that the number of allowed solutions depend on the choice of the upper limit on $Br(B_c\rightarrow \tau\bar{\nu})$. We find that the forward-backward asymmetries in $B\rightarrow (D, D^*)\tau\bar{\nu}$ decays have the capability to distinguish between different solutions. Further we calculate the maximum values of CP violating triple product asymmetries in $B\to D^*\tau\bar{\nu}$ decay allowed the current data. We observe that only one of the three CP asymmetries can be enhanced up to a maximum value of $\sim 2-3\%$ whereas the other asymmetries remain smaller.
|
hep-ph/9909569
|
Sverker Fredriksson
|
Jean-Jacques Dugne, Sverker Fredriksson, Johan Hansson and Enrico
Predazzi
|
Preon Trinity - a new model of leptons and quarks
|
12 pages Latex, no figures; to be published in the Proceedings of
Beyond 99, Tegernsee, Germany, June 1999
| null | null | null |
hep-ph
| null |
A new model for the substructure of quarks, leptons and weak gauge bosons is
discussed. It is based on three fundamental and absolutely stable spin-1/2
preons. Its preon flavour SU(3) symmetry leads to a prediction of nine quarks,
nine leptons and nine heavy vector bosons. One of the quarks has charge
$-4e/3$, and is speculated to be the top quark (whose charge has not been
measured). The flavour symmetry leads to three conserved lepton numbers in all
known weak processes, except for some neutrinos, which might either oscillate
or decay. There is also a (Cabibbo) mixing of the $d$ and $s$ quarks due to an
internal preon-antipreon annihilation channel. An identical channel exists
inside the composite $Z^0$, leading to a relation between the Cabibbo and
Weinberg mixing angles.
|
[
{
"created": "Thu, 30 Sep 1999 15:03:42 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 1999 14:28:00 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Oct 1999 07:41:55 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Dugne",
"Jean-Jacques",
""
],
[
"Fredriksson",
"Sverker",
""
],
[
"Hansson",
"Johan",
""
],
[
"Predazzi",
"Enrico",
""
]
] |
A new model for the substructure of quarks, leptons and weak gauge bosons is discussed. It is based on three fundamental and absolutely stable spin-1/2 preons. Its preon flavour SU(3) symmetry leads to a prediction of nine quarks, nine leptons and nine heavy vector bosons. One of the quarks has charge $-4e/3$, and is speculated to be the top quark (whose charge has not been measured). The flavour symmetry leads to three conserved lepton numbers in all known weak processes, except for some neutrinos, which might either oscillate or decay. There is also a (Cabibbo) mixing of the $d$ and $s$ quarks due to an internal preon-antipreon annihilation channel. An identical channel exists inside the composite $Z^0$, leading to a relation between the Cabibbo and Weinberg mixing angles.
|
hep-ph/9601238
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
New Low-Energy Realization of the Superstring-Inspired E_6 Model
|
9 pages, no figure, talk given at the 5th Hellenic School and
Worshops on Elementary Particle Physics, Corfu, Greece (September 1995)
| null | null |
UCRHEP-T155 (January 1996)
|
hep-ph
| null |
The superstring-inspired E_6 model is reduced to the supersymmetric standard
model extended by a specific U(1) factor. This choice allows for the existence
of naturally light singlet neutrinos which also mix with the known three
doublet neutrinos, thus making it possible to accommodate all present neutrino
data. Other consequences of this model are also discussed: oblique corrections
from Z-Z' mixing, phenomenology of the two-Higgs-doublet sector, and possible
scenarios of gauge-coupling unification.
|
[
{
"created": "Wed, 10 Jan 1996 18:55:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
The superstring-inspired E_6 model is reduced to the supersymmetric standard model extended by a specific U(1) factor. This choice allows for the existence of naturally light singlet neutrinos which also mix with the known three doublet neutrinos, thus making it possible to accommodate all present neutrino data. Other consequences of this model are also discussed: oblique corrections from Z-Z' mixing, phenomenology of the two-Higgs-doublet sector, and possible scenarios of gauge-coupling unification.
|
hep-ph/0012263
|
HsinChia Cheng
|
Hsin-Chia Cheng (University of Chicago)
|
Electroweak symmetry breaking and extra dimensions
|
4 pages, LaTeX, talk presented at the Linear Collider Workshop 2000,
Fermilab, Oct. 24-28, 2000
| null |
10.1063/1.1394389
|
EFI-2000-49
|
hep-ph
| null |
The electroweak symmetry may be broken by a composite Higgs which arises
naturally as a bound state of the top quark if the standard model gauge fields
and fermions propagate in extra dimenions. The top quark mass and the Higgs
mass can be predicted from the infrared fixed points of the renormalization
group equations. The top quark mass is in good agreement with the experimental
value, and the Higgs boson mass is predicted to be $\sim 200$ GeV. The bounds
on the compactification scale can be quite low if all standard model fields
propagate in the same extra dimensions due to the momentum conservation in
extra dimensions. The current lower limits are about 300 GeV for one extra
dimension and 400-800 GeV for two extra dimensions. The future collider
experiments may either discover the Kaluza-Klein (KK) states of the standard
model fields or raise their mass limits significantly. There may also be some
other light bound states which could be observed at upcoming collider
experiments.
|
[
{
"created": "Wed, 20 Dec 2000 03:40:02 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Cheng",
"Hsin-Chia",
"",
"University of Chicago"
]
] |
The electroweak symmetry may be broken by a composite Higgs which arises naturally as a bound state of the top quark if the standard model gauge fields and fermions propagate in extra dimenions. The top quark mass and the Higgs mass can be predicted from the infrared fixed points of the renormalization group equations. The top quark mass is in good agreement with the experimental value, and the Higgs boson mass is predicted to be $\sim 200$ GeV. The bounds on the compactification scale can be quite low if all standard model fields propagate in the same extra dimensions due to the momentum conservation in extra dimensions. The current lower limits are about 300 GeV for one extra dimension and 400-800 GeV for two extra dimensions. The future collider experiments may either discover the Kaluza-Klein (KK) states of the standard model fields or raise their mass limits significantly. There may also be some other light bound states which could be observed at upcoming collider experiments.
|
1105.5273
|
Sreemoyee Sarkar
|
Sreemoyee Sarkar and Abhee K. Dutt-Mazumder
|
Non-Fermi liquid behavior of the drag and diffusion coefficients in QED
plasma
|
9 pages, 3 eps figures, accepted for publication in Physical Review D
| null |
10.1103/PhysRevD.84.096009
| null |
hep-ph astro-ph.HE cond-mat.other nucl-th physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the drag and diffusion coefficients in low temperature QED
plasma and go beyond the leading order approximation. The non-Fermi-liquid
behavior of these coefficients are clearly revealed. We observe that the
subleading contributions due to the exchange of soft transverse photon in both
cases are larger than the leading order terms coming from the longitudinal
sector. The results are presented in closed form at zero and low temperature.
|
[
{
"created": "Thu, 26 May 2011 13:14:53 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2011 12:15:09 GMT",
"version": "v2"
}
] |
2015-05-28
|
[
[
"Sarkar",
"Sreemoyee",
""
],
[
"Dutt-Mazumder",
"Abhee K.",
""
]
] |
We calculate the drag and diffusion coefficients in low temperature QED plasma and go beyond the leading order approximation. The non-Fermi-liquid behavior of these coefficients are clearly revealed. We observe that the subleading contributions due to the exchange of soft transverse photon in both cases are larger than the leading order terms coming from the longitudinal sector. The results are presented in closed form at zero and low temperature.
|
1307.4400
|
Matthew Reece
|
JiJi Fan and Matthew Reece
|
In Wino Veritas? Indirect Searches Shed Light on Neutralino Dark Matter
| null | null |
10.1007/JHEP10(2013)124
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Indirect detection constraints on gamma rays (both continuum and lines) have
set strong constraints on wino dark matter. By combining results from Fermi-LAT
and HESS, we show that: light nonthermal wino dark matter is strongly excluded;
thermal wino dark matter is allowed only if the Milky Way dark matter
distribution has a significant (>~0.4 kpc) core; and for plausible NFW and
Einasto distributions the entire range of wino masses from 100 GeV up to 3 TeV
can be excluded. The case of light, nonthermal wino dark matter is particularly
interesting in scenarios with decaying moduli that reheat the universe to a low
temperature. Typically such models have been discussed for low reheating
temperatures, not far above the BBN bound of a few MeV. We show that
constraints on the allowed wino relic density push such models to higher
reheating temperatures and hence heavier moduli. Even for a flattened halo
model consisting of an NFW profile with constant-density core inside 1 kpc and
a density near the sun of 0.3 GeV/cm^3, for 150 GeV winos current data
constrains the reheat temperature to be above 1.4 GeV. As a result, for models
in which the wino mass is a loop factor below the gravitino mass, the data
favor moduli that are more than an order of magnitude heavier than the
gravitino. We discuss some of the sobering implications of this result for the
status of supersymmetry. We also comment on other neutralino dark matter
scenarios, in particular the case of mixed bino/higgsino dark matter. We show
that in this case, direct and indirect searches are complementary to each other
and could potentially cover most of the parameter space.
|
[
{
"created": "Tue, 16 Jul 2013 20:00:01 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Fan",
"JiJi",
""
],
[
"Reece",
"Matthew",
""
]
] |
Indirect detection constraints on gamma rays (both continuum and lines) have set strong constraints on wino dark matter. By combining results from Fermi-LAT and HESS, we show that: light nonthermal wino dark matter is strongly excluded; thermal wino dark matter is allowed only if the Milky Way dark matter distribution has a significant (>~0.4 kpc) core; and for plausible NFW and Einasto distributions the entire range of wino masses from 100 GeV up to 3 TeV can be excluded. The case of light, nonthermal wino dark matter is particularly interesting in scenarios with decaying moduli that reheat the universe to a low temperature. Typically such models have been discussed for low reheating temperatures, not far above the BBN bound of a few MeV. We show that constraints on the allowed wino relic density push such models to higher reheating temperatures and hence heavier moduli. Even for a flattened halo model consisting of an NFW profile with constant-density core inside 1 kpc and a density near the sun of 0.3 GeV/cm^3, for 150 GeV winos current data constrains the reheat temperature to be above 1.4 GeV. As a result, for models in which the wino mass is a loop factor below the gravitino mass, the data favor moduli that are more than an order of magnitude heavier than the gravitino. We discuss some of the sobering implications of this result for the status of supersymmetry. We also comment on other neutralino dark matter scenarios, in particular the case of mixed bino/higgsino dark matter. We show that in this case, direct and indirect searches are complementary to each other and could potentially cover most of the parameter space.
|
0705.0579
|
Fuminobu Takahashi
|
Fuminobu Takahashi
|
Gravitino Dark Matter from Inflaton Decay
|
16 pages, 3 figures. v2: references and figures added
|
Phys.Lett.B660:100-106,2008
|
10.1016/j.physletb.2007.12.048
|
DESY 07-060
|
hep-ph astro-ph hep-th
| null |
We discuss a scenario that gravitinos produced non-thermally by an inflaton
decay constitute dark matter in the present universe. We find that this
scenario is realized for wide ranges of the inflaton mass and the vacuum
expectation value. What is intriguing about this scenario is that the gravitino
dark matter can have a relatively large free streaming length at
matter-radiation equality, which can be probed by future observation on
QSO-galaxy strong lens system.
|
[
{
"created": "Fri, 4 May 2007 18:51:54 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2007 15:04:38 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Takahashi",
"Fuminobu",
""
]
] |
We discuss a scenario that gravitinos produced non-thermally by an inflaton decay constitute dark matter in the present universe. We find that this scenario is realized for wide ranges of the inflaton mass and the vacuum expectation value. What is intriguing about this scenario is that the gravitino dark matter can have a relatively large free streaming length at matter-radiation equality, which can be probed by future observation on QSO-galaxy strong lens system.
|
hep-ph/0110039
|
Kozhevnikov Arkadii
|
N.N. Achasov, A.A. Kozhevnikov
|
On spectroscopy of rho', rho'', and omega', omega'' resonances
|
6 pages. Talk presented by A.A. Kozhevnikov at IX International
Conference on Hadron Spectroscopy, 25 August-1 September, 2001, IHEP,
Protvino, Russia
|
AIP Conf.Proc. 619 (2002) 687-690
|
10.1063/1.1482519
| null |
hep-ph hep-ex nucl-th
| null |
Based on coupling constants extracted from fitting various data, the selected
branching ratios and full widths of rho', rho'', and omega', omega'' resonances
are calculated, and some topics on the spectroscopy of these states are
discussed.
|
[
{
"created": "Wed, 3 Oct 2001 05:20:26 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Achasov",
"N. N.",
""
],
[
"Kozhevnikov",
"A. A.",
""
]
] |
Based on coupling constants extracted from fitting various data, the selected branching ratios and full widths of rho', rho'', and omega', omega'' resonances are calculated, and some topics on the spectroscopy of these states are discussed.
|
hep-ph/0606279
|
Pavel Fileviez Perez
|
Pavel Fileviez Perez
|
Upper Bound on the Proton Lifetime and the Minimal Non-SUSY Grand
Unified Theory
|
8 pages. Based on the Talks given at NURT'06 (V International
Symposium on Nuclear and Related Techniques, Havana, CUBA, 3-7 April 2006),
PLANCK'06 (The ninth European meeting "From the Planck scale to the
ElectroWeak scale", Paris, FRANCE, 29 May 29 - 2 June,2006) and SUSY'06 (14th
International Conference on Supersymmetry and the Unification of Fundamental
Interactions. Irvine, California, USA. 12-17 June 2006)
|
AIP Conf.Proc.903:385-389,2006
|
10.1063/1.2735205
| null |
hep-ph hep-ex
| null |
In this talk we show that it is possible to find an upper bound on the total
proton lifetime. We conclude that the minimal realistic non-supersymmetric
grand unified theory is the modified Georgi-Glashow model with a Higgs sector
composed of 5_H, 24_H, and 15_H. We discuss the possibility to test this
scenario at the next generation of proton decay experiments and future
colliders through the production of light scalar leptoquarks.
|
[
{
"created": "Tue, 27 Jun 2006 17:41:23 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Perez",
"Pavel Fileviez",
""
]
] |
In this talk we show that it is possible to find an upper bound on the total proton lifetime. We conclude that the minimal realistic non-supersymmetric grand unified theory is the modified Georgi-Glashow model with a Higgs sector composed of 5_H, 24_H, and 15_H. We discuss the possibility to test this scenario at the next generation of proton decay experiments and future colliders through the production of light scalar leptoquarks.
|
hep-ph/9508342
|
Oscar J. P. Eboli
|
Oscar J. P. Eboli
|
Bounds on Scalar Leptoquarks from the LEP Data
|
9 pages, latex, uses worldsci.sty (included), 1 figure (included);
some references were added and typos corrected
| null | null |
IFUSP 1170
|
hep-ph
| null |
We obtain the constraints on scalar leptoquarks coming from radiative
corrections to $Z$ physics. We perform a global fitting to the LEP data
including the contributions of the most general effective Lagrangian for scalar
leptoquarks, which exhibits the $SU(2)_L \times U(1)_Y$ gauge invariance. Our
bounds on leptoquarks that couple to the top quark are much stronger than the
ones obtained from low energy experiments.
|
[
{
"created": "Mon, 21 Aug 1995 21:56:46 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 1995 23:33:28 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Eboli",
"Oscar J. P.",
""
]
] |
We obtain the constraints on scalar leptoquarks coming from radiative corrections to $Z$ physics. We perform a global fitting to the LEP data including the contributions of the most general effective Lagrangian for scalar leptoquarks, which exhibits the $SU(2)_L \times U(1)_Y$ gauge invariance. Our bounds on leptoquarks that couple to the top quark are much stronger than the ones obtained from low energy experiments.
|
1712.06644
|
Wim de Boer
|
Wim de Boer ((1) Karlsruhe Institute of Technology, Karlsruhe,
Germany)
|
Perspectives on the detection of supersymmetric Dark Matter
|
18 pages, 12 figures. Invited talk at ICNFP2017, August 2017, Crete,
Greece
| null | null | null |
hep-ph astro-ph.CO astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Up to now searches for Dark Matter (DM) detection have not been successful,
either because our paradigm in how DM signals should look like are wrong or the
detector sensitivity is still too low in spite of the large progress made in
recent years. We discuss both possibilities starting with what we know about DM
from cosmology and why Supersymmetry provides such an interesting paradigm for
cosmology and particle physics in order to appreciate what it means to give up
this paradigm. In addition, we compare the predicted cross sections for direct
and indirect DM detection with observations with emphasis on the latest
developments. Especially, we discuss the possible origins of the two hotly
debated candidates for a DM annihilation signal, namely the positron excess and
the Fermi GeV excess, which are unfortunately incompatible with each other and
more mundane astrophysical explanations exist.
|
[
{
"created": "Mon, 18 Dec 2017 19:42:06 GMT",
"version": "v1"
}
] |
2017-12-20
|
[
[
"de Boer",
"Wim",
""
]
] |
Up to now searches for Dark Matter (DM) detection have not been successful, either because our paradigm in how DM signals should look like are wrong or the detector sensitivity is still too low in spite of the large progress made in recent years. We discuss both possibilities starting with what we know about DM from cosmology and why Supersymmetry provides such an interesting paradigm for cosmology and particle physics in order to appreciate what it means to give up this paradigm. In addition, we compare the predicted cross sections for direct and indirect DM detection with observations with emphasis on the latest developments. Especially, we discuss the possible origins of the two hotly debated candidates for a DM annihilation signal, namely the positron excess and the Fermi GeV excess, which are unfortunately incompatible with each other and more mundane astrophysical explanations exist.
|
1212.5859
|
Andrea Ferroglia
|
Valentin Ahrens, Andrea Ferroglia, Matthias Neubert, Benjamin Pecjak,
Lilin Yang
|
Forward-Backward and Charge Asymmetries in the Standard Model
|
8 pages, 2 figures. Proceedings of CKM 2012, the 7th International
Workshop on the CKM Unitarity Triangle, University of Cincinnati, USA, 28
September - 2 October 2012
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This talk reviews the Standard Model predictions for the top-quark forward
backward and charge asymmetries measured at the Tevatron and at the LHC.
|
[
{
"created": "Mon, 24 Dec 2012 03:20:08 GMT",
"version": "v1"
}
] |
2012-12-27
|
[
[
"Ahrens",
"Valentin",
""
],
[
"Ferroglia",
"Andrea",
""
],
[
"Neubert",
"Matthias",
""
],
[
"Pecjak",
"Benjamin",
""
],
[
"Yang",
"Lilin",
""
]
] |
This talk reviews the Standard Model predictions for the top-quark forward backward and charge asymmetries measured at the Tevatron and at the LHC.
|
1310.7478
|
Carlo Giunti Dr.
|
M. Laveder, C. Giunti
|
Phenomenology of neutrino oscillations and mixing
|
8 pages. Talk presented by M. Laveder at the XXXVII International
Conference of Theoretical Physics 'Matter to the deepest', Ustron, 1-6
September 2013
| null |
10.5506/APhysPolB.44.2323
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the status of three-neutrino mixing and the results of global
analyses of short-baseline neutrino oscillation data in 3+1 and 3+2 neutrino
mixing schemes.
|
[
{
"created": "Mon, 28 Oct 2013 16:22:08 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Laveder",
"M.",
""
],
[
"Giunti",
"C.",
""
]
] |
We review the status of three-neutrino mixing and the results of global analyses of short-baseline neutrino oscillation data in 3+1 and 3+2 neutrino mixing schemes.
|
hep-ph/9609451
|
Sacha Davidson
|
S. Davidson, J. Ellis
|
Basis Independent Measures of R-parity Violation
|
13 pages, Latex
|
Phys.Lett.B390:210-220,1997
|
10.1016/S0370-2693(96)01398-6
|
CERN-TH/96-258, CfPA-96-th-20, MPI-PhT-96-68
|
hep-ph
| null |
We construct basis-independent expressions that measure the magnitude of
$R$-parity breaking due to possible superpotential terms in the Minimal
Supersymmetric extension of the Standard Model, in the absence of soft
supersymmetry-breaking terms and spontaneous gauge symmetry breaking. We also
discuss briefly their application to a consistent treatment of cosmological
constraints on $R$-parity violation.
|
[
{
"created": "Tue, 24 Sep 1996 16:57:16 GMT",
"version": "v1"
}
] |
2009-09-11
|
[
[
"Davidson",
"S.",
""
],
[
"Ellis",
"J.",
""
]
] |
We construct basis-independent expressions that measure the magnitude of $R$-parity breaking due to possible superpotential terms in the Minimal Supersymmetric extension of the Standard Model, in the absence of soft supersymmetry-breaking terms and spontaneous gauge symmetry breaking. We also discuss briefly their application to a consistent treatment of cosmological constraints on $R$-parity violation.
|
hep-ph/9911313
|
Vladimir A. Saleev
|
O. N. Pakhomova, V. A. Saleev
|
Spin effects in two-particle hadronic decays of B_c mesons
|
LaTex2.09, 8 pages plus 1 figure using epsf.sty,psfig.sty
|
Phys.Atom.Nucl.63:1999-2003,2000; Yad.Fiz.63:2091-2095,2000
|
10.1134/1.1335101
|
SSU-HEP-99/2, will be published in Phys.Atom.Nucl
|
hep-ph
| null |
We consider spin effects in two-particle hadronic decays of B_c and B_c^*
mesons into J/psi plus \rho(\pi) in the frame work of hard gluon exchange
model. It is shown that polarization of the J/psi meson is very different in
decays of B_c and B_c^* mesons as well as their decay widths into J/psi plus
\rho(\pi).
|
[
{
"created": "Thu, 11 Nov 1999 14:03:37 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2000 16:19:01 GMT",
"version": "v2"
}
] |
2011-03-23
|
[
[
"Pakhomova",
"O. N.",
""
],
[
"Saleev",
"V. A.",
""
]
] |
We consider spin effects in two-particle hadronic decays of B_c and B_c^* mesons into J/psi plus \rho(\pi) in the frame work of hard gluon exchange model. It is shown that polarization of the J/psi meson is very different in decays of B_c and B_c^* mesons as well as their decay widths into J/psi plus \rho(\pi).
|
hep-ph/0304250
|
Igor Marfin
|
I.B. Marfin, V.A. Mossolov, T.V. Shishkina
|
Anomalous quartic boson couplings via gamma gamma --> WW and gamma gamma
--> WWZ at the TESLA kinematics
|
16 pages, 17 figures, talk on 4th ECFA/DESY Workshop, April 1-4, 2003
| null | null | null |
hep-ph
| null |
The production of two and three electroweak gauge bosons in the high-energy
$\gamma\gamma$ collisions gives the well opportunity to probe anomalous quartic
gauge boson couplings. The influence of five possible anomalous couplings on
the cross sections for $W^+W^-$, $W^+W^-\gamma$, $W^+W^-Z$ productions has been
investigated at the TESLA kinematics ($\sqrt{S}\sim 1$ TeV). There are the
reasonable discriminations between various anomalous contributions.
|
[
{
"created": "Sat, 26 Apr 2003 13:41:43 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 2003 12:00:36 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Marfin",
"I. B.",
""
],
[
"Mossolov",
"V. A.",
""
],
[
"Shishkina",
"T. V.",
""
]
] |
The production of two and three electroweak gauge bosons in the high-energy $\gamma\gamma$ collisions gives the well opportunity to probe anomalous quartic gauge boson couplings. The influence of five possible anomalous couplings on the cross sections for $W^+W^-$, $W^+W^-\gamma$, $W^+W^-Z$ productions has been investigated at the TESLA kinematics ($\sqrt{S}\sim 1$ TeV). There are the reasonable discriminations between various anomalous contributions.
|
1408.5665
|
Tanmoy Modak
|
Tanmoy Modak, Dibyakrupa Sahoo, Rahul Sinha, Hai-Yang Cheng and
Tzu-Chiang Yuan
|
Disentangling the Spin-Parity of a Resonance via the Gold-Plated Decay
Mode
|
16 pages, 11 figures, added a new section on numerical analysis
| null |
10.1088/1674-1137/40/3/033002
|
IMSc/2014/8/6
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Searching for new resonances and finding out their properties is an essential
part of any existing or future particle physics experiment. The nature of a new
resonance is characterized by its spin, charge conjugation, parity, and its
couplings with the existing particles of the Standard Model. If a new resonance
is found in the four lepton final state produced via two intermediate $Z$
bosons, the resonance could be a new heavy scalar or a $Z'$ boson or even a
higher spin particle. In such cases the step by step methodology as enunciated
in this paper can be followed to determine the spin, parity and the coupling to
two $Z$ bosons of the parent particles, in a fully model-independent way. In
our approach we show how three uni-angular distributions and few experimentally
measurable observables can conclusively tell us about the spin, parity as well
as the couplings of the new resonance to two $Z$ bosons. We have performed a
numerical analysis to validate our approach and showed how the uniangular
observables can be used to disentangle the spin parity as well as coupling of
the resonance.
|
[
{
"created": "Mon, 25 Aug 2014 06:05:28 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2015 08:44:04 GMT",
"version": "v2"
}
] |
2016-04-13
|
[
[
"Modak",
"Tanmoy",
""
],
[
"Sahoo",
"Dibyakrupa",
""
],
[
"Sinha",
"Rahul",
""
],
[
"Cheng",
"Hai-Yang",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] |
Searching for new resonances and finding out their properties is an essential part of any existing or future particle physics experiment. The nature of a new resonance is characterized by its spin, charge conjugation, parity, and its couplings with the existing particles of the Standard Model. If a new resonance is found in the four lepton final state produced via two intermediate $Z$ bosons, the resonance could be a new heavy scalar or a $Z'$ boson or even a higher spin particle. In such cases the step by step methodology as enunciated in this paper can be followed to determine the spin, parity and the coupling to two $Z$ bosons of the parent particles, in a fully model-independent way. In our approach we show how three uni-angular distributions and few experimentally measurable observables can conclusively tell us about the spin, parity as well as the couplings of the new resonance to two $Z$ bosons. We have performed a numerical analysis to validate our approach and showed how the uniangular observables can be used to disentangle the spin parity as well as coupling of the resonance.
|
2306.01836
|
Howard E. Haber
|
Miguel P. Bento, Howard E. Haber, Jo\~ao P. Silva
|
Tree-level Unitarity in SU(2)$_L\times$U(1)$_Y \times$U(1)$_{Y'}$ Models
|
29 pages, 2 figures, 2 tables. Version 3 coincides with the published
version. Version 4 adds some clarifying remarks to footnotes 3 and 4 and
reorganizes the material of Section 6.3
|
JHEP 10 (2023) 083
|
10.1007/JHEP10(2023)083
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In models with a U(1) gauge extension beyond the Standard Model, one can
derive sum rules for the couplings of the theory that are a consequence of
tree-level unitarity. In this paper, we provide a comprehensive list of
coupling sum rules for a general SU(2)$_L\times$U(1)$_Y \times$U(1)$_{Y'}$
gauge theory coupled to an arbitrary set of fermion and scalar multiplets.
These results are of particular interest for models of dark matter that employ
an extended gauge sector mediated by a new (dark) $Z^\prime$ gauge boson. For
the case of a minimal extension of the Standard Model with a U(1)$_{Y'}$ gauge
boson, we clarify the definitions of the weak mixing angle and the electroweak
$\rho$ parameter. We demonstrate the utility of a generalized $\rho$ parameter
(denoted by $\rho^\prime$) whose definition naturally follows from the
unitarity sum rules developed in this paper.
|
[
{
"created": "Fri, 2 Jun 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2023 13:21:29 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Aug 2023 14:10:50 GMT",
"version": "v3"
},
{
"created": "Wed, 13 Dec 2023 10:48:28 GMT",
"version": "v4"
}
] |
2023-12-14
|
[
[
"Bento",
"Miguel P.",
""
],
[
"Haber",
"Howard E.",
""
],
[
"Silva",
"João P.",
""
]
] |
In models with a U(1) gauge extension beyond the Standard Model, one can derive sum rules for the couplings of the theory that are a consequence of tree-level unitarity. In this paper, we provide a comprehensive list of coupling sum rules for a general SU(2)$_L\times$U(1)$_Y \times$U(1)$_{Y'}$ gauge theory coupled to an arbitrary set of fermion and scalar multiplets. These results are of particular interest for models of dark matter that employ an extended gauge sector mediated by a new (dark) $Z^\prime$ gauge boson. For the case of a minimal extension of the Standard Model with a U(1)$_{Y'}$ gauge boson, we clarify the definitions of the weak mixing angle and the electroweak $\rho$ parameter. We demonstrate the utility of a generalized $\rho$ parameter (denoted by $\rho^\prime$) whose definition naturally follows from the unitarity sum rules developed in this paper.
|
hep-ph/0612070
|
R. Sekhar Chivukula
|
R. Sekhar Chivukula, Hong-Jian He, Masafumi Kurachi, Elizabeth H.
Simmons, and Masaharu Tanabashi
|
Deconstruction and Elastic pi pi Scattering in Higgsless Models
|
33 pages, JHEP3. Minor typos corrected
|
Phys.Rev.D75:035005,2007
|
10.1103/PhysRevD.75.035005
|
MSUHEP-061206, YITP-SB-06-55, TU-782
|
hep-ph
| null |
We study elastic pion-pion scattering in global linear moose models and apply
the results to a variety of Higgsless models in flat and AdS space using the
Equivalence Theorem. In order to connect the global moose to Higgsless models,
we first introduce a block-spin transformation which corresponds, in the
continuum, to the freedom to perform coordinate transformations in the
Higgsless model. We show that it is possible to make an "f-flat" deconstruction
in which all of the f-constants f_j of the linear moose model are identical;
the phenomenologically relevant f-flat models are those in which the coupling
constants of the groups at either end of the moose are small - corresponding to
the global linear moose. In studying pion-pion scattering, we derive various
sum rules, including one analogous to the KSRF relation, and use them in
evaluating the low-energy and high-energy forms of the leading elastic partial
wave scattering amplitudes. We obtain elastic unitarity bounds as a function of
the mass of the lightest KK mode and discuss their physical significance.
|
[
{
"created": "Wed, 6 Dec 2006 16:05:54 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2006 16:08:00 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Jan 2007 15:12:59 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Chivukula",
"R. Sekhar",
""
],
[
"He",
"Hong-Jian",
""
],
[
"Kurachi",
"Masafumi",
""
],
[
"Simmons",
"Elizabeth H.",
""
],
[
"Tanabashi",
"Masaharu",
""
]
] |
We study elastic pion-pion scattering in global linear moose models and apply the results to a variety of Higgsless models in flat and AdS space using the Equivalence Theorem. In order to connect the global moose to Higgsless models, we first introduce a block-spin transformation which corresponds, in the continuum, to the freedom to perform coordinate transformations in the Higgsless model. We show that it is possible to make an "f-flat" deconstruction in which all of the f-constants f_j of the linear moose model are identical; the phenomenologically relevant f-flat models are those in which the coupling constants of the groups at either end of the moose are small - corresponding to the global linear moose. In studying pion-pion scattering, we derive various sum rules, including one analogous to the KSRF relation, and use them in evaluating the low-energy and high-energy forms of the leading elastic partial wave scattering amplitudes. We obtain elastic unitarity bounds as a function of the mass of the lightest KK mode and discuss their physical significance.
|
1204.4803
|
Lucian Harland-Lang
|
L.A. Harland-Lang, V.A. Khoze, M.G. Ryskin, W.J. Stirling
|
The phenomenology of central exclusive production at hadron colliders
|
37 pages, 10 figures. Some discussion added and clarified. KK
production now considered in section 5.2. Version that appears in EPJC
| null |
10.1140/epjc/s10052-012-2110-2
|
IPPP/12/12, DCPT/12/24, Cavendish-HEP-12/05
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Central exclusive production (CEP) processes in high-energy hadron-hadron
collisions provide an especially clean environment in which to measure the
nature and quantum numbers (in particular, the spin and parity) of new
resonance states. Encouraged by the broad agreement between experimental
measurements and theoretical predictions based on the Durham approach, we
perform a detailed phenomenological analysis of diphoton and meson pair CEP
final states, paying particular attention to the theoretical uncertainties in
the predictions, including those from parton distribution functions,
higher-order perturbative corrections, and non-perturbative and proton
dissociation contributions. We present quantitative cross-section predictions
for these CEP final states at the RHIC, Tevatron and LHC colliders.
|
[
{
"created": "Sat, 21 Apr 2012 11:40:42 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2012 14:57:37 GMT",
"version": "v2"
}
] |
2012-09-26
|
[
[
"Harland-Lang",
"L. A.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Stirling",
"W. J.",
""
]
] |
Central exclusive production (CEP) processes in high-energy hadron-hadron collisions provide an especially clean environment in which to measure the nature and quantum numbers (in particular, the spin and parity) of new resonance states. Encouraged by the broad agreement between experimental measurements and theoretical predictions based on the Durham approach, we perform a detailed phenomenological analysis of diphoton and meson pair CEP final states, paying particular attention to the theoretical uncertainties in the predictions, including those from parton distribution functions, higher-order perturbative corrections, and non-perturbative and proton dissociation contributions. We present quantitative cross-section predictions for these CEP final states at the RHIC, Tevatron and LHC colliders.
|
1809.02515
|
Akira Watanabe
|
Akira Watanabe and Mei Huang
|
Total hadronic cross sections at high energies in holographic QCD
|
6 pages, 2 figures; v2: version accepted for publication in Phys.
Lett. B, clarifications added to Section 2 and Section 3; v3: typos in
Eq.(11) corrected
| null |
10.1016/j.physletb.2018.11.042
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present our analysis on high energy hadron-hadron scattering in the
framework of the holographic QCD. Combining the Brower-Polchinski-Strassler-Tan
Pomeron exchange kernel and gravitational form factors of the involved hadrons
which are obtained by using the bottom-up AdS/QCD models in the
five-dimensional AdS space, we calculate the total cross sections at high
energies. We show that our calculations for the nucleon-nucleon scattering
agree with the experimental data including the recent ones taken by the TOTEM
collaboration at the LHC. The present framework is applicable to any high
energy process, in which the strong interaction can be approximated by the
Pomeron exchange. We present the results for the pion-nucleon and pion-pion
scattering as examples, which can be obtained without any additional parameter
because all the adjustable parameters are fixed via the analysis on the
nucleon-nucleon scattering. The resulting total cross section ratios are
$\sigma_{tot}^{\pi N} / \sigma_{tot}^{N N} = 0.63$ and $\sigma_{tot}^{\pi \pi}
/ \sigma_{tot}^{N N} = 0.45$, respectively.
|
[
{
"created": "Fri, 7 Sep 2018 14:50:25 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2018 08:51:37 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Apr 2020 10:03:16 GMT",
"version": "v3"
}
] |
2020-04-07
|
[
[
"Watanabe",
"Akira",
""
],
[
"Huang",
"Mei",
""
]
] |
We present our analysis on high energy hadron-hadron scattering in the framework of the holographic QCD. Combining the Brower-Polchinski-Strassler-Tan Pomeron exchange kernel and gravitational form factors of the involved hadrons which are obtained by using the bottom-up AdS/QCD models in the five-dimensional AdS space, we calculate the total cross sections at high energies. We show that our calculations for the nucleon-nucleon scattering agree with the experimental data including the recent ones taken by the TOTEM collaboration at the LHC. The present framework is applicable to any high energy process, in which the strong interaction can be approximated by the Pomeron exchange. We present the results for the pion-nucleon and pion-pion scattering as examples, which can be obtained without any additional parameter because all the adjustable parameters are fixed via the analysis on the nucleon-nucleon scattering. The resulting total cross section ratios are $\sigma_{tot}^{\pi N} / \sigma_{tot}^{N N} = 0.63$ and $\sigma_{tot}^{\pi \pi} / \sigma_{tot}^{N N} = 0.45$, respectively.
|
2407.01185
|
Kan Chen
|
Kan Chen and Bo Wang
|
From the $P^{N}_{\psi}$/$P^{\Lambda}_{\psi s}$ to $\bar{T}^f_{cc}$:
symmetry analysis to the interactions of the
$(\bar{c}q)(\bar{c}q)$/$(ccq)(\bar{c}q)$/$(ccq)(ccq)$ di-hadron systems
|
12 pages, 4 figures, 4 Tables
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the interactions of the
$(\bar{c}q)(\bar{c}q)$/$(ccq)(\bar{c}q)$/$(ccq)(ccq)$ di-hadron systems based
on a contact lagrangian possessing the SU(3) flavor and SU(2) spin symmetries.
Under the assumptions of two scenarios for the $J^P$ quantum numbers of the
$P_{\psi}^N(4440)$ and $P_{\psi}^N(4457)$ states, we obtain the parameters
($\tilde{g}_s$, $\tilde{g}_a$) introduced from this contact lagrangian. Then we
include the SU(3) breaking effect by introducing a factor $g_x$, this quantity
can be further constrained by the experimental mass of the $P_{\psi
s}^\Lambda(4338)$ state. We can reproduce the mass of the $T^f_{cc}(3875)$
state with the parameters extracted from the observed $P_{\psi}^N$ states, this
consistency indicates a unified description of the di-hadron molecular states
composed of two heavy-light hadrons. With the same parameters, we discuss the
possible mass spectra of the $\bar{T}_{cc}^f$/$P_{\psi
c}^\Lambda$/$H_{\Omega_{ccc}c}^\Lambda$ systems. Then we proceed to discuss the
existences of the $\bar{T}_{cc\bar{s}}^\theta$/$P_{\psi
cs}^N$/$H_{\Omega_{ccc}cs}^N$ states by investigating the SU(3) breaking
effects. Our results show that the states in the
$\bar{T}_{cc\bar{s}}^\theta$/$P_{\psi cs}^N$ systems can hardly form bound
states, while the states in the $H_{\Omega_{ccc}cs}^N$ system can form bound
states due to their larger reduced masses.
|
[
{
"created": "Mon, 1 Jul 2024 11:22:40 GMT",
"version": "v1"
}
] |
2024-07-02
|
[
[
"Chen",
"Kan",
""
],
[
"Wang",
"Bo",
""
]
] |
We investigate the interactions of the $(\bar{c}q)(\bar{c}q)$/$(ccq)(\bar{c}q)$/$(ccq)(ccq)$ di-hadron systems based on a contact lagrangian possessing the SU(3) flavor and SU(2) spin symmetries. Under the assumptions of two scenarios for the $J^P$ quantum numbers of the $P_{\psi}^N(4440)$ and $P_{\psi}^N(4457)$ states, we obtain the parameters ($\tilde{g}_s$, $\tilde{g}_a$) introduced from this contact lagrangian. Then we include the SU(3) breaking effect by introducing a factor $g_x$, this quantity can be further constrained by the experimental mass of the $P_{\psi s}^\Lambda(4338)$ state. We can reproduce the mass of the $T^f_{cc}(3875)$ state with the parameters extracted from the observed $P_{\psi}^N$ states, this consistency indicates a unified description of the di-hadron molecular states composed of two heavy-light hadrons. With the same parameters, we discuss the possible mass spectra of the $\bar{T}_{cc}^f$/$P_{\psi c}^\Lambda$/$H_{\Omega_{ccc}c}^\Lambda$ systems. Then we proceed to discuss the existences of the $\bar{T}_{cc\bar{s}}^\theta$/$P_{\psi cs}^N$/$H_{\Omega_{ccc}cs}^N$ states by investigating the SU(3) breaking effects. Our results show that the states in the $\bar{T}_{cc\bar{s}}^\theta$/$P_{\psi cs}^N$ systems can hardly form bound states, while the states in the $H_{\Omega_{ccc}cs}^N$ system can form bound states due to their larger reduced masses.
|
hep-ph/0506228
|
Dan Pirjol
|
Yuval Grossman, Andreas Hocker, Zoltan Ligeti, Dan Pirjol
|
Testing the dynamics of B -> \pi\pi and constraints on \alpha
|
8 pages, 6 figures, includes special style file; final version to
appear in Phys. Rev. D
|
Phys.Rev.D72:094033,2005
|
10.1103/PhysRevD.72.094033
|
LAL 05-34, LBNL-57484, MIT-CTP 3624
|
hep-ph
| null |
In charmless nonleptonic B decays to \pi\pi or \rho\rho, the "color allowed"
and "color suppressed" tree amplitudes can be studied in a systematic expansion
in \alphas(mb) and \Lambda/mb. At leading order in this expansion their
relative strong phase vanishes. The implications of this prediction are
obscured by penguin contributions. We propose to use this prediction to test
the relative importance of the various penguin amplitudes using experimental
data. The present B->\pi\pi data suggest that there are large corrections to
the heavy quark limit, which can be due to power corrections to the tree
amplitudes, large up-quark penguin amplitude, or enhanced weak annihilation.
Because the penguin contributions are smaller, the heavy quark limit is more
consistent with the B->\rho\rho data, and its implications may become important
for the extraction of \alpha from this mode in the future.
|
[
{
"created": "Thu, 23 Jun 2005 12:16:08 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2005 17:46:23 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Oct 2005 19:48:09 GMT",
"version": "v3"
}
] |
2014-11-18
|
[
[
"Grossman",
"Yuval",
""
],
[
"Hocker",
"Andreas",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Pirjol",
"Dan",
""
]
] |
In charmless nonleptonic B decays to \pi\pi or \rho\rho, the "color allowed" and "color suppressed" tree amplitudes can be studied in a systematic expansion in \alphas(mb) and \Lambda/mb. At leading order in this expansion their relative strong phase vanishes. The implications of this prediction are obscured by penguin contributions. We propose to use this prediction to test the relative importance of the various penguin amplitudes using experimental data. The present B->\pi\pi data suggest that there are large corrections to the heavy quark limit, which can be due to power corrections to the tree amplitudes, large up-quark penguin amplitude, or enhanced weak annihilation. Because the penguin contributions are smaller, the heavy quark limit is more consistent with the B->\rho\rho data, and its implications may become important for the extraction of \alpha from this mode in the future.
|
hep-ph/0407072
|
Shouhua Zhu
|
Shou-hua Zhu
|
Chargino Pair Production at Linear Collider and Split Supersymmetry
|
14 pages, 5 eps figs included, minor clarification, refs added
|
Phys.Lett. B604 (2004) 207-215
|
10.1016/j.physletb.2004.11.011
| null |
hep-ph hep-ex
| null |
Recently N. Arkani-Hamed and S. Dimopoulos proposed a supersymmetric model
\cite{Arkani-Hamed:2004fb}, dubbed "Split Supersymmetry" in Ref.
\cite{Giudice:2004tc}, which can remove most of the unpleasant shortcomings of
TeV Supersymmetry. In this model all scalars except one finely tuned Higgs
boson are ultra heavy while the neutralino and chargino might remain light in
order to achieve gauge coupling unification and accord with the dark matter
density. In this paper, we investigated the impact of this new model on
chargino pair production at next generation linear colliders. Our numerical
results show that this process can be used to probe sneutrino mass up to 10
TeV. Therefore, precise measurements of chargino pair production at the linear
colliders could distinguish Split Supersymmetry from TeV Supersymmetry.
|
[
{
"created": "Tue, 6 Jul 2004 16:29:00 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 2004 19:34:12 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Zhu",
"Shou-hua",
""
]
] |
Recently N. Arkani-Hamed and S. Dimopoulos proposed a supersymmetric model \cite{Arkani-Hamed:2004fb}, dubbed "Split Supersymmetry" in Ref. \cite{Giudice:2004tc}, which can remove most of the unpleasant shortcomings of TeV Supersymmetry. In this model all scalars except one finely tuned Higgs boson are ultra heavy while the neutralino and chargino might remain light in order to achieve gauge coupling unification and accord with the dark matter density. In this paper, we investigated the impact of this new model on chargino pair production at next generation linear colliders. Our numerical results show that this process can be used to probe sneutrino mass up to 10 TeV. Therefore, precise measurements of chargino pair production at the linear colliders could distinguish Split Supersymmetry from TeV Supersymmetry.
|
hep-ph/0405169
|
Axel Bredenstein
|
A.Bredenstein, S.Dittmaier and M.Roth
|
Four-fermion production at gamma gamma colliders: 1. Lowest-order
predictions and anomalous couplings
|
40 pages, latex, 27 ps-figures, some references added, final version
to appear in Eur. Phys. J. C
|
Eur.Phys.J.C36:341-363,2004
|
10.1140/epjc/s2004-01948-4
|
MPP-2004-54
|
hep-ph
| null |
We have constructed a Monte Carlo generator for lowest-order predictions for
the processes gamma gamma -> 4f and gamma gamma -> 4f+gamma in the Standard
Model and extensions thereof by an effective gamma gamma Higgs coupling as well
as anomalous triple and quartic gauge-boson couplings. Polarization is fully
supported, and a realistic photon beam spectrum can be taken into account. For
the processes gamma gamma -> 4f all helicity amplitudes are explicitly given in
a compact form. The presented numerical results contain, in particular, a
survey of cross sections for representative final states and their comparison
to results obtained with the program package Whizard/Madgraph. The impact of a
realistic beam spectrum on cross sections and distributions is illustrated.
Moreover, the size of various contributions to cross sections, such as from
weak charged- or neutral-current, or from strong interactions, is analyzed.
Particular attention is paid to W-pair production channels gamma gamma -> W W
-> 4f(+gamma) where we investigate the impact of background diagrams, possible
definitions of the W-pair signal, and the issue of gauge-invariance violation
caused by finite gauge-boson widths. Finally, the effects of triple and quartic
anomalous gauge-boson couplings on cross sections as well as the possibility to
constrain these anomalous couplings at future gamma gamma colliders are
discussed.
|
[
{
"created": "Tue, 18 May 2004 14:07:42 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jul 2004 14:10:59 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bredenstein",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Roth",
"M.",
""
]
] |
We have constructed a Monte Carlo generator for lowest-order predictions for the processes gamma gamma -> 4f and gamma gamma -> 4f+gamma in the Standard Model and extensions thereof by an effective gamma gamma Higgs coupling as well as anomalous triple and quartic gauge-boson couplings. Polarization is fully supported, and a realistic photon beam spectrum can be taken into account. For the processes gamma gamma -> 4f all helicity amplitudes are explicitly given in a compact form. The presented numerical results contain, in particular, a survey of cross sections for representative final states and their comparison to results obtained with the program package Whizard/Madgraph. The impact of a realistic beam spectrum on cross sections and distributions is illustrated. Moreover, the size of various contributions to cross sections, such as from weak charged- or neutral-current, or from strong interactions, is analyzed. Particular attention is paid to W-pair production channels gamma gamma -> W W -> 4f(+gamma) where we investigate the impact of background diagrams, possible definitions of the W-pair signal, and the issue of gauge-invariance violation caused by finite gauge-boson widths. Finally, the effects of triple and quartic anomalous gauge-boson couplings on cross sections as well as the possibility to constrain these anomalous couplings at future gamma gamma colliders are discussed.
|
2208.09584
|
Amir N. Khan
|
Amir N. Khan
|
Extra dimensions with light and heavy neutral leptons: An application to
CE$\nu$NS
|
30 pages, 6 figures
|
J. High Energ. Phys. 2023, 52 (2023)
|
10.1007/JHEP01(2023)052
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We explore the possibility of relating extra dimensions with light and heavy
Dirac-type neutral leptons and develop a framework for testing them in various
laboratory experiments. The Kaluza-Klein modes in the large extra dimension
models of the light neutral leptons could mix with the standard model neutrinos
and produce observable effects in the oscillation experiments. We show that the
chirality flipping up-scattering processes occurring through either neutrino
magnetic dipole moment or the weakly coupled scalar interactions can also
produce heavy Kaluza-Klein modes of the corresponding right-handed neutral
leptons propagating in one or more extra dimensions. However, to conserve the
four-dimensional energy-momentum, their masses must be below the maximum energy
of the neutrinos in the initial state. The appreciable size of extra dimensions
connected with these heavy neutral leptons can thus affect the cross-sections
of these processes. This framework applies to any up-scattering process. Our
work here focuses only on its application to the coherent elastic
neutrino-nucleus scattering process. We derive constraints on the size of extra
dimensions using the COHERENT data in oscillation and up-scattering processes.
For model with one large extra dimension for the light neutral leptons, we
obtain the limits, $R \sim 3 \ \mu$m (NH) and $R \sim 2.5 \ \mu$m (IH), on the
size of extra dimension corresponding to the absolute mass limit, $m_{0} \leq 3
\times 10^{-3}$ eV at 90$\%$ C.L. from the short-baseline oscillations. Using
the up-scattering process for heavy neutral leptons, we obtain new parameter
spaces between the size of extra dimensions and parameters of the dipole or
scalar interactions.
|
[
{
"created": "Sat, 20 Aug 2022 03:11:04 GMT",
"version": "v1"
}
] |
2023-01-16
|
[
[
"Khan",
"Amir N.",
""
]
] |
We explore the possibility of relating extra dimensions with light and heavy Dirac-type neutral leptons and develop a framework for testing them in various laboratory experiments. The Kaluza-Klein modes in the large extra dimension models of the light neutral leptons could mix with the standard model neutrinos and produce observable effects in the oscillation experiments. We show that the chirality flipping up-scattering processes occurring through either neutrino magnetic dipole moment or the weakly coupled scalar interactions can also produce heavy Kaluza-Klein modes of the corresponding right-handed neutral leptons propagating in one or more extra dimensions. However, to conserve the four-dimensional energy-momentum, their masses must be below the maximum energy of the neutrinos in the initial state. The appreciable size of extra dimensions connected with these heavy neutral leptons can thus affect the cross-sections of these processes. This framework applies to any up-scattering process. Our work here focuses only on its application to the coherent elastic neutrino-nucleus scattering process. We derive constraints on the size of extra dimensions using the COHERENT data in oscillation and up-scattering processes. For model with one large extra dimension for the light neutral leptons, we obtain the limits, $R \sim 3 \ \mu$m (NH) and $R \sim 2.5 \ \mu$m (IH), on the size of extra dimension corresponding to the absolute mass limit, $m_{0} \leq 3 \times 10^{-3}$ eV at 90$\%$ C.L. from the short-baseline oscillations. Using the up-scattering process for heavy neutral leptons, we obtain new parameter spaces between the size of extra dimensions and parameters of the dipole or scalar interactions.
|
2302.05856
|
June-Haak Ee
|
Geoffrey T. Bodwin, June-Haak Ee, Daekyoung Kang, Xiang-Peng Wang
|
Gauge invariance of radiative jet functions in the position-space
formulation of SCET
|
33 pages, 7 figures. [v2] Major revision. Soft-quark equation of
motion used to reformulate the Lagrangians. [v3] conceptual clarifications,
version published in Physical Review D
|
Physical Review D, 109, 5, 056020 (2024)
|
10.1103/PhysRevD.109.056020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In subleading powers of soft-collinear effective theory (SCET), the
Lagrangian contains couplings between soft quarks and hard-collinear quarks.
Matrix elements of the hard-collinear parts of these couplings are radiative
jet functions. In the position-space formulation of SCET, the Lagrangians are
constructed from operators that appear to be gauge invariant. Nevertheless, we
find violations of gauge invariance arise in the hard-collinear sector because
gauge transformations can shift the momentum of a hard-collinear quark field
from the hard-collinear sector to the soft sector, where the hard-collinear
fields, by definition, have no support. The violations of gauge invariance are
manifested in perturbation theory in the hard-collinear sector through the
absence of certain Feynman diagrams that would be present in full QCD. A
consequence of the absence of these diagrams is that the radiative jet
functions that follow directly from the position-space Lagrangians are not
gauge invariant, and we demonstrate this through explicit calculations in
lower-order perturbation theory. We obtain gauge-invariant Lagrangians by
adding to existing position-space Lagrangians terms that are proportional to
the soft-quark equation of motion. These gauge-invariant Lagrangians are valid
for nonzero, as well as zero, quark masses. We also remark briefly on the gauge
invariance of certain Lagrangians that have been constructed in the
label-momentum formulation of SCET.
|
[
{
"created": "Sun, 12 Feb 2023 04:50:04 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jun 2023 09:51:19 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Mar 2024 23:19:54 GMT",
"version": "v3"
}
] |
2024-04-02
|
[
[
"Bodwin",
"Geoffrey T.",
""
],
[
"Ee",
"June-Haak",
""
],
[
"Kang",
"Daekyoung",
""
],
[
"Wang",
"Xiang-Peng",
""
]
] |
In subleading powers of soft-collinear effective theory (SCET), the Lagrangian contains couplings between soft quarks and hard-collinear quarks. Matrix elements of the hard-collinear parts of these couplings are radiative jet functions. In the position-space formulation of SCET, the Lagrangians are constructed from operators that appear to be gauge invariant. Nevertheless, we find violations of gauge invariance arise in the hard-collinear sector because gauge transformations can shift the momentum of a hard-collinear quark field from the hard-collinear sector to the soft sector, where the hard-collinear fields, by definition, have no support. The violations of gauge invariance are manifested in perturbation theory in the hard-collinear sector through the absence of certain Feynman diagrams that would be present in full QCD. A consequence of the absence of these diagrams is that the radiative jet functions that follow directly from the position-space Lagrangians are not gauge invariant, and we demonstrate this through explicit calculations in lower-order perturbation theory. We obtain gauge-invariant Lagrangians by adding to existing position-space Lagrangians terms that are proportional to the soft-quark equation of motion. These gauge-invariant Lagrangians are valid for nonzero, as well as zero, quark masses. We also remark briefly on the gauge invariance of certain Lagrangians that have been constructed in the label-momentum formulation of SCET.
|
0912.1003
|
Adriano Gomes doff
|
A. Doff and A. A. Natale
|
Scalar bosons in Minimal and Ultraminimal Technicolor: Masses, trilinear
couplings and widths
|
15 pages, 1 figure, improved discussion, new references and typos
corrected, matchs version to be published
|
Phys.Rev.D81:095014,2010
|
10.1103/PhysRevD.81.095014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute masses, trilinear self-couplings and decay widths into weak bosons
of the scalar composite bosons in the case of the Minimal and Ultraminimal
technicolor models. The masses, computed via the Bethe-Salpeter equation, turn
out to be light and the trilinear couplings smaller than the one that would be
expected when compared to a fundamental Standard Model scalar boson with the
same mass. The decay widths into electroweak bosons of the Ultraminimal model
scalars bosons are much smaller than the one of the Minimal model.
|
[
{
"created": "Sat, 5 Dec 2009 12:23:50 GMT",
"version": "v1"
},
{
"created": "Tue, 4 May 2010 20:54:29 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Doff",
"A.",
""
],
[
"Natale",
"A. A.",
""
]
] |
We compute masses, trilinear self-couplings and decay widths into weak bosons of the scalar composite bosons in the case of the Minimal and Ultraminimal technicolor models. The masses, computed via the Bethe-Salpeter equation, turn out to be light and the trilinear couplings smaller than the one that would be expected when compared to a fundamental Standard Model scalar boson with the same mass. The decay widths into electroweak bosons of the Ultraminimal model scalars bosons are much smaller than the one of the Minimal model.
|
hep-ph/0111335
|
Joshua Erlich
|
J. Erlich, C. Grojean
|
Supernovae as a probe of particle physics and cosmology
|
17 pages, LaTeX, 4 figures; v2: typos corrected, minor changes,
references added; v3: updated figures, details regarding fits included
|
Phys.Rev. D65 (2002) 123510
|
10.1103/PhysRevD.65.123510
|
Saclay T01/126
|
hep-ph astro-ph
| null |
It has very recently been demonstrated by Csaki, Kaloper and Terning (CKT)
that the faintness of supernovae at high redshift can be accommodated by mixing
of a light axion with the photon in the presence of an intergalactic magnetic
field, as opposed to the usual explanation of an accelerating universe by a
dark energy component. In this paper we analyze further aspects of the CKT
mechanism and its generalizations. The CKT mechanism also passes various
cosmological constraints from the fluctuations of the CMB and the formation of
structure at large scales, without requiring an accelerating phase in the
expansion of the Universe. We investigate the statistical significance of
current supernova data for pinning down the different components of the
cosmological energy-momentum tensor and for probing physics beyond the standard
models.
|
[
{
"created": "Tue, 27 Nov 2001 20:07:15 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2001 21:16:06 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2002 16:49:14 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Erlich",
"J.",
""
],
[
"Grojean",
"C.",
""
]
] |
It has very recently been demonstrated by Csaki, Kaloper and Terning (CKT) that the faintness of supernovae at high redshift can be accommodated by mixing of a light axion with the photon in the presence of an intergalactic magnetic field, as opposed to the usual explanation of an accelerating universe by a dark energy component. In this paper we analyze further aspects of the CKT mechanism and its generalizations. The CKT mechanism also passes various cosmological constraints from the fluctuations of the CMB and the formation of structure at large scales, without requiring an accelerating phase in the expansion of the Universe. We investigate the statistical significance of current supernova data for pinning down the different components of the cosmological energy-momentum tensor and for probing physics beyond the standard models.
|
hep-ph/0102276
|
Hans Volker Klapdor
|
H.V. Klapdor-Kleingrothaus (Max-Planck-Institut fuer Kernphysik,
Heidelberg, Germany)
|
Neutrino Mass from Laboratory: Contribution of Double Beta Decay to the
Neutrino Mass Matrix
|
5 pages, revtex, 6 figures, Talk was presented at International
Europhysics Neutrino Oscillation Workshop, Conca Specchiulla (Otranto,
Italy), September 9-16, 2000, to be published in Nucl. Phys. B (2001), Home
Page of Heidelberg-Moscow Experiment: http://www.mpi-hd.mpg.de/non_acc/
|
Nucl.Phys.Proc.Suppl. 100 (2001) 309-313
|
10.1016/S0920-5632(01)01462-1
| null |
hep-ph
| null |
Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with $\nu$ oscillation experiments. The most sensitive
experiment - since eight years the HEIDELBERG-MOSCOW experiment in Gran-Sasso -
already now, with the experimental limit of $<m_\nu > < 0.26$ eV practically
excludes degenerate $\nu$ mass scenarios allowing neutrinos as hot dark matter
in the universe for the smallangle MSW solution of the solar neutrino problem.
It probes cosmological models including hot dark matter already now on the
level of future satellite experiments MAP and PLANCK. It further probes many
topics of beyond SM physics at the TeV scale. Future experiments should give
access to the multi-TeV range and complement on many ways the search for new
physics at future colliders like LHC and NLC. For neutrino physics some of them
(GENIUS) will allow to test almost all neutrino mass scenarios allowed by the
present neutrino oscillation experiments.
|
[
{
"created": "Thu, 22 Feb 2001 16:04:53 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Klapdor-Kleingrothaus",
"H. V.",
"",
"Max-Planck-Institut fuer Kernphysik,\n Heidelberg, Germany"
]
] |
Double beta decay is indispensable to solve the question of the neutrino mass matrix together with $\nu$ oscillation experiments. The most sensitive experiment - since eight years the HEIDELBERG-MOSCOW experiment in Gran-Sasso - already now, with the experimental limit of $<m_\nu > < 0.26$ eV practically excludes degenerate $\nu$ mass scenarios allowing neutrinos as hot dark matter in the universe for the smallangle MSW solution of the solar neutrino problem. It probes cosmological models including hot dark matter already now on the level of future satellite experiments MAP and PLANCK. It further probes many topics of beyond SM physics at the TeV scale. Future experiments should give access to the multi-TeV range and complement on many ways the search for new physics at future colliders like LHC and NLC. For neutrino physics some of them (GENIUS) will allow to test almost all neutrino mass scenarios allowed by the present neutrino oscillation experiments.
|
2401.00411
|
Ning Yu
|
Hongge Xu, Ning Yu, Zuman Zhang
|
Study the structure of X(3872) from its lineshape
|
7 pages, 2 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We fit the invariant mass distribution of
${X(3872)}\rightarrow{J}/{\psi}\pi^+\pi^-$ from LHCb and
${X(3872)}\rightarrow{D}^{0}\overline{D}^{0*}$ from Belle using the propagator
for S-wave threshold states in effective field theory. In this way, we can
directly determine the $Z$ which is the probability of finding the compact
component in ${X(3872)}$.
|
[
{
"created": "Sun, 31 Dec 2023 06:54:42 GMT",
"version": "v1"
},
{
"created": "Fri, 17 May 2024 02:33:54 GMT",
"version": "v2"
}
] |
2024-05-20
|
[
[
"Xu",
"Hongge",
""
],
[
"Yu",
"Ning",
""
],
[
"Zhang",
"Zuman",
""
]
] |
We fit the invariant mass distribution of ${X(3872)}\rightarrow{J}/{\psi}\pi^+\pi^-$ from LHCb and ${X(3872)}\rightarrow{D}^{0}\overline{D}^{0*}$ from Belle using the propagator for S-wave threshold states in effective field theory. In this way, we can directly determine the $Z$ which is the probability of finding the compact component in ${X(3872)}$.
|
1111.4817
|
Tamas Biro S
|
T. S. Biro (1), M. Gyulassy (2) and Z. Schram (3) ((1) Theory
Division, MTA KFKI Res. Inst. for Particle and Nuclear Physics, Budapest,
Hungary (2) Dept. of Physics, Columbia University, NY, USA (3) Dept. of
Theoretical Physics, University of Debrecen, Hungary)
|
Unruh gamma radiation at RHIC?
|
LaTeX 5 pages, 2 eps figures, PACS numbers: 24.10.Pa, 25.75.Ag,
25.20.Lj Keywords: Thermal models, Unruh temperature, bremsstrahlung, photon
spectra
|
Physics Letters B 708: (2012) 276-279
|
10.1016/j.physletb.2011.12.062
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Varying the proposition that acceleration itself would simulate a thermal
environment, we investigate the semiclassical photon radiation as a possible
telemetric thermometer of accelerated charges. Based on the classical Jackson
formula we obtain the equivalent photon intensity spectrum stemming from a
constantly accelerated charge and demonstrate its resemblances to a thermal
distribution for high transverse momenta. The inverse transverse slope differs
from the famous Unruh temperature: it is larger by a factor of pi. We compare
the resulting direct photon spectrum with experimental data for AuAu collisions
at RHIC and speculate about further, analytically solvable acceleration
histories.
|
[
{
"created": "Mon, 21 Nov 2011 10:35:00 GMT",
"version": "v1"
}
] |
2012-12-18
|
[
[
"Biro",
"T. S.",
""
],
[
"Gyulassy",
"M.",
""
],
[
"Schram",
"Z.",
""
]
] |
Varying the proposition that acceleration itself would simulate a thermal environment, we investigate the semiclassical photon radiation as a possible telemetric thermometer of accelerated charges. Based on the classical Jackson formula we obtain the equivalent photon intensity spectrum stemming from a constantly accelerated charge and demonstrate its resemblances to a thermal distribution for high transverse momenta. The inverse transverse slope differs from the famous Unruh temperature: it is larger by a factor of pi. We compare the resulting direct photon spectrum with experimental data for AuAu collisions at RHIC and speculate about further, analytically solvable acceleration histories.
|
hep-ph/9707451
|
Paul Langacker
|
M. Cvetic and P. Langacker
|
Z' Physics and Supersymmetry
|
30 pages. To appear in Perspectives in Supersymmetry, World
Scientific, ed. G. L. Kane
| null |
10.1142/9789812839657_0012
|
UPR-0761-T
|
hep-ph hep-th
| null |
We review the status of heavy neutral gauge bosons, Z', with emphasis on
constraints that arise in supersymmetric models, especially those motivated
from superstring compactifications. We first summarize the current
phenomenological constraints and the prospects for Z' detection and diagnostics
at the LHC and NLC. After elaborating on the status and (lack of) predictive
power for general models with an additional Z', we concentrate on motivations
and successes for Z' physics in supersymmetric theories in general and in a
class of superstring models in particular. We review phenomenologically viable
scenarios with the Z' mass in the electroweak or in the intermediate scale
region.
|
[
{
"created": "Thu, 24 Jul 1997 17:22:13 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Cvetic",
"M.",
""
],
[
"Langacker",
"P.",
""
]
] |
We review the status of heavy neutral gauge bosons, Z', with emphasis on constraints that arise in supersymmetric models, especially those motivated from superstring compactifications. We first summarize the current phenomenological constraints and the prospects for Z' detection and diagnostics at the LHC and NLC. After elaborating on the status and (lack of) predictive power for general models with an additional Z', we concentrate on motivations and successes for Z' physics in supersymmetric theories in general and in a class of superstring models in particular. We review phenomenologically viable scenarios with the Z' mass in the electroweak or in the intermediate scale region.
|
2002.01548
|
Mikolaj Misiak
|
M. Misiak, A. Rehman, M. Steinhauser
|
Towards B -> X_s gamma at the NNLO in QCD without interpolation in m_c
|
journal version, 16 pages, 5 figures
| null |
10.1007/JHEP06(2020)175
|
TTP20-001, P3H-20-005, IFT-01/2020
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Strengthening constraints on new physics from the B -> X_s gamma branching
ratio requires improving accuracy in the measurements and the Standard Model
predictions. To match the expected Belle-II accuracy, Next-to-Next-to-Leading
Order (NNLO) QCD corrections must be calculated without the so-far employed
interpolation in the charm-quark mass m_c. In the process of evaluating such
corrections at the physical value of m_c, we have finalized the part coming
from diagrams with closed fermion loops on the gluon lines that contribute to
the interference of the current-current and photonic dipole operators. We
confirm several published results for corrections of this type, and supplement
them with a previously uncalculated piece. Taking into account the recently
improved estimates of non-perturbative contributions, we find B_{s gamma} =
(3.40 \pm 0.17) * 10^{-4} and R_gamma = B_{(s+d) gamma}/B_{c l nu} = (3.35 \pm
0.16) * 10^{-3} for E_gamma > 1.6 GeV in the decaying meson rest frame.
|
[
{
"created": "Tue, 4 Feb 2020 21:35:05 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jun 2020 20:51:50 GMT",
"version": "v2"
}
] |
2020-07-15
|
[
[
"Misiak",
"M.",
""
],
[
"Rehman",
"A.",
""
],
[
"Steinhauser",
"M.",
""
]
] |
Strengthening constraints on new physics from the B -> X_s gamma branching ratio requires improving accuracy in the measurements and the Standard Model predictions. To match the expected Belle-II accuracy, Next-to-Next-to-Leading Order (NNLO) QCD corrections must be calculated without the so-far employed interpolation in the charm-quark mass m_c. In the process of evaluating such corrections at the physical value of m_c, we have finalized the part coming from diagrams with closed fermion loops on the gluon lines that contribute to the interference of the current-current and photonic dipole operators. We confirm several published results for corrections of this type, and supplement them with a previously uncalculated piece. Taking into account the recently improved estimates of non-perturbative contributions, we find B_{s gamma} = (3.40 \pm 0.17) * 10^{-4} and R_gamma = B_{(s+d) gamma}/B_{c l nu} = (3.35 \pm 0.16) * 10^{-3} for E_gamma > 1.6 GeV in the decaying meson rest frame.
|
1312.2547
|
Luis Anchordoqui
|
Luis A. Anchordoqui, Peter B. Denton, Haim Goldberg, Thomas C. Paul,
Luiz H. M. da Silva, Brian J. Vlcek, Thomas J. Weiler
|
Weinberg's Higgs portal confronting recent LUX and LHC results together
with upper limits on B^+ and K^+ decay into invisibles
|
Matching version accepted for publication in Physical Review D
|
Phys. Rev. D 89, 083513 (2014)
|
10.1103/PhysRevD.89.083513
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a number of experimental constraints on Weinberg's Higgs portal
model. In this framework, the standard model (SM) particle spectrum is extended
to include one complex scalar field S and one Dirac fermion \psi. These new
fields are singlets under the SM gauge group and are charged under a global
U(1) symmetry. Breaking of this U(1) symmetry results in a massless Goldstone
boson \alpha and a massive CP-even scalar r, and splits the Dirac fermion into
two new mass-eigenstates \psi_\pm, corresponding to Majorana fermions. The
interest on such a minimal SM extension is twofold. On the one hand, if the
Goldstone bosons are in thermal equilibrium with SM particles until the era of
muon annihilation their contribution to the effective number of neutrino
species can explain the hints from cosmological observations of extra
relativistic degrees of freedom at the epoch of last scattering. On the other
hand, the lightest Majorana fermion \psi_- provides a plausible dark matter
candidate. Mixing of r with the Higgs doublet \phi is characterized by the mass
of hidden scalar m_h and the mixing angle \theta. We constrain this parameter
space using a variety of experimental data, including heavy meson decays with
missing energy, the invisible Higgs width, and direct dark matter searches. We
show that different experimental results compress the allowed parameter space
in complementary ways, covering a large range of \psi_- masses (5 GeV \alt m_-
\alt 100 GeV). Though current results narrow the parameter space significantly
(for the mass range of interest, \theta \alt 10^{-3} to 10^{-4}), there is
still room for discovery (\alpha decoupling at the muon annihilation era
requires \theta \agt 10^{-5} to 10^{-4}). In the near future, measurements from
ATLAS, CMS, LHCb, NA62, XENON1T, LUX, and CDMSlite will probe nearly the full
parameter space.
|
[
{
"created": "Mon, 9 Dec 2013 18:55:21 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 2014 16:43:02 GMT",
"version": "v2"
}
] |
2014-04-23
|
[
[
"Anchordoqui",
"Luis A.",
""
],
[
"Denton",
"Peter B.",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Paul",
"Thomas C.",
""
],
[
"da Silva",
"Luiz H. M.",
""
],
[
"Vlcek",
"Brian J.",
""
],
[
"Weiler",
"Thomas J.",
""
]
] |
We discuss a number of experimental constraints on Weinberg's Higgs portal model. In this framework, the standard model (SM) particle spectrum is extended to include one complex scalar field S and one Dirac fermion \psi. These new fields are singlets under the SM gauge group and are charged under a global U(1) symmetry. Breaking of this U(1) symmetry results in a massless Goldstone boson \alpha and a massive CP-even scalar r, and splits the Dirac fermion into two new mass-eigenstates \psi_\pm, corresponding to Majorana fermions. The interest on such a minimal SM extension is twofold. On the one hand, if the Goldstone bosons are in thermal equilibrium with SM particles until the era of muon annihilation their contribution to the effective number of neutrino species can explain the hints from cosmological observations of extra relativistic degrees of freedom at the epoch of last scattering. On the other hand, the lightest Majorana fermion \psi_- provides a plausible dark matter candidate. Mixing of r with the Higgs doublet \phi is characterized by the mass of hidden scalar m_h and the mixing angle \theta. We constrain this parameter space using a variety of experimental data, including heavy meson decays with missing energy, the invisible Higgs width, and direct dark matter searches. We show that different experimental results compress the allowed parameter space in complementary ways, covering a large range of \psi_- masses (5 GeV \alt m_- \alt 100 GeV). Though current results narrow the parameter space significantly (for the mass range of interest, \theta \alt 10^{-3} to 10^{-4}), there is still room for discovery (\alpha decoupling at the muon annihilation era requires \theta \agt 10^{-5} to 10^{-4}). In the near future, measurements from ATLAS, CMS, LHCb, NA62, XENON1T, LUX, and CDMSlite will probe nearly the full parameter space.
|
hep-ph/0604159
|
Stephan J. Huber
|
Lars Fromme, Stephan J. Huber
|
Top transport in electroweak baryogenesis
|
17 pages, 3 figures, references added
|
JHEP 0703:049,2007
|
10.1088/1126-6708/2007/03/049
| null |
hep-ph
| null |
In non-supersymmetric models of electroweak baryogenesis the top quark plays
a crucial role. Its CP-violating source term can be calculated in the WKB
approximation. We point out how to resolve certain discrepancies between
computations starting from the Dirac equation and the Schwinger--Keldysh
formalism. We also improve on the transport equations, keeping the
W-scatterings at finite rate. We apply these results to a model with one Higgs
doublet, augmented by dimension-6 operators, where our refinements lead to an
increase in the baryon asymmetry by a factor of up to about 5.
|
[
{
"created": "Wed, 19 Apr 2006 14:07:40 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2006 14:31:13 GMT",
"version": "v2"
}
] |
2010-10-27
|
[
[
"Fromme",
"Lars",
""
],
[
"Huber",
"Stephan J.",
""
]
] |
In non-supersymmetric models of electroweak baryogenesis the top quark plays a crucial role. Its CP-violating source term can be calculated in the WKB approximation. We point out how to resolve certain discrepancies between computations starting from the Dirac equation and the Schwinger--Keldysh formalism. We also improve on the transport equations, keeping the W-scatterings at finite rate. We apply these results to a model with one Higgs doublet, augmented by dimension-6 operators, where our refinements lead to an increase in the baryon asymmetry by a factor of up to about 5.
|
0910.5625
|
Christoph Weniger
|
Christoph Weniger
|
Dark Matter Decay and Cosmic Rays
|
4 pages, 2 figures, 1 table, talk given at 5th Patras Workshop on
Axions, WIMPs and WISPs, Durham, UK, 13-17 July 2009
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The decay of dark matter is predicted by many theoretical models and can
produce observable contributions to the cosmic-ray fluxes. I shortly discuss
the interpretation of the positron and electron excess as observed by PAMELA
and Fermi LAT in terms of decaying dark matter, and I point out the
implications for the Fermi LAT observations of the gamma-ray flux with emphasis
on its dipole-like anisotropy.
|
[
{
"created": "Thu, 29 Oct 2009 12:47:03 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Weniger",
"Christoph",
""
]
] |
The decay of dark matter is predicted by many theoretical models and can produce observable contributions to the cosmic-ray fluxes. I shortly discuss the interpretation of the positron and electron excess as observed by PAMELA and Fermi LAT in terms of decaying dark matter, and I point out the implications for the Fermi LAT observations of the gamma-ray flux with emphasis on its dipole-like anisotropy.
|
hep-ph/0510127
|
Bo-Qiang Ma
|
Bo-Qiang Ma
|
NuTeV Anomaly Versus Strange-Antistrange Asymmetry
|
4 Latex pages, 1 figure, talk presented at International Conference
on QCD and Hadronic Physics, Beijing, China, June 16-20, 2005
|
Int.J.Mod.Phys. A21 (2006) 930-933
|
10.1142/S0217751X06032344
| null |
hep-ph
| null |
We report the correction from the asymmetric strange-antistrange sea of the
nucleon by using both the light-cone baryon-meson fluctuation model and the
chiral quark model, and show that a significant part of the NuTeV anomaly can
be explained by the strange-antistrange asymmetry. We also show that the
calculated $s/\bar{s}$ asymmetry are compatible with the NuTeV data by
including some additional symmetric $s/\bar{s}$ quark contribution.
|
[
{
"created": "Tue, 11 Oct 2005 00:23:04 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Ma",
"Bo-Qiang",
""
]
] |
We report the correction from the asymmetric strange-antistrange sea of the nucleon by using both the light-cone baryon-meson fluctuation model and the chiral quark model, and show that a significant part of the NuTeV anomaly can be explained by the strange-antistrange asymmetry. We also show that the calculated $s/\bar{s}$ asymmetry are compatible with the NuTeV data by including some additional symmetric $s/\bar{s}$ quark contribution.
|
2203.01965
|
Marcel Golz
|
Marcel Golz, Gudrun Hiller, Tom Magorsch
|
Null test BSM searches with rare charm baryon decays
|
6 pages, 3 figures, Contribution to the 11th International Workshop
on the CKM Unitarity Triangle (CKM2021), 22-26 November 2021, The University
of Melbourne, Australia
| null | null |
DO-TH 22/08
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Rare $\vert \Delta c \vert=\vert \Delta u \vert=1$ processes uniquely probe
flavor in the Standard Model and beyond from the up-type quark sector.
Opportunities to search for BSM physics in charm arise from the severe GIM
suppression which kills SM contributions to leptonic axial-vector contributions
and suppresses CP violation. Semileptonic decays of charmed hadrons offer a
variety of clean null test observables, featuring new physics effects which are
even enhanced by resonance contributions. In particular, angular observables in
three- and self-analyzing four-body baryon decays, such as $\Lambda_c\to p
\ell^+\ell^-$ and $\Xi_c^+\to\Sigma^+(\to p\pi^0)\ell^+\ell^-$,
$\Xi_c^0\to\Lambda^0\,(\to p \pi^-)\ell^+\ell^-$ and $\Omega_c^0\to\Xi^0\,(\to
\Lambda^{0} \pi^0)\ell^+\ell^-$ disentangle possible new physics effects in
electromagnetic dipole couplings $C_7^{(\prime)}$ and (axial-)vector 4-fermion
ones $C^{(\prime)}_{9\,(10)}$. There is sensitivity to BSM couplings as small
as $\sim 0.01$.
|
[
{
"created": "Thu, 3 Mar 2022 19:08:05 GMT",
"version": "v1"
}
] |
2022-03-07
|
[
[
"Golz",
"Marcel",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"Magorsch",
"Tom",
""
]
] |
Rare $\vert \Delta c \vert=\vert \Delta u \vert=1$ processes uniquely probe flavor in the Standard Model and beyond from the up-type quark sector. Opportunities to search for BSM physics in charm arise from the severe GIM suppression which kills SM contributions to leptonic axial-vector contributions and suppresses CP violation. Semileptonic decays of charmed hadrons offer a variety of clean null test observables, featuring new physics effects which are even enhanced by resonance contributions. In particular, angular observables in three- and self-analyzing four-body baryon decays, such as $\Lambda_c\to p \ell^+\ell^-$ and $\Xi_c^+\to\Sigma^+(\to p\pi^0)\ell^+\ell^-$, $\Xi_c^0\to\Lambda^0\,(\to p \pi^-)\ell^+\ell^-$ and $\Omega_c^0\to\Xi^0\,(\to \Lambda^{0} \pi^0)\ell^+\ell^-$ disentangle possible new physics effects in electromagnetic dipole couplings $C_7^{(\prime)}$ and (axial-)vector 4-fermion ones $C^{(\prime)}_{9\,(10)}$. There is sensitivity to BSM couplings as small as $\sim 0.01$.
|
1511.09284
|
Juhi Dutta
|
Juhi Dutta, Partha Konar, Subhadeep Mondal, Biswarup Mukhopadhyaya,
Santosh Kumar Rai
|
A revisit to a compressed supersymmetric spectrum with 125 GeV Higgs
|
31 pages, 5 figures, 8 tables. Typos corrected. Added References.
Accepted for publication in JHEP
|
JHEP 01 (2016) 051
|
10.1007/JHEP01(2016)051
|
HRI-RECAPP-2015-018
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A compressed spectrum was initially proposed as an explanation for the
elusiveness of low-energy supersymmetry (SUSY). Some characteristic signals at
the Large Hadron Collider (LHC), such as mono-jet + \slashed{E}_T, had been
propounded as its trademark signals. However, later investigations suggested
that lower limits on the supersymmetric particle masses would be quite
stringent in spite of compression. Also, most compressed SUSY scenarios studied
so far are only partially compressed. In this backdrop, we make an exhaustive
analysis of the compressed SUSY scenarios for the 13 TeV run of LHC, keeping
the level of compression in the entire spectrum as high as possible. A broad
class of benchmark spectra are thus considered, after ensuring consistency with
the observed Higgs mass as well as the dark matter constraints. The rates of
observable events in the high-energy run are obtained through detailed
simulation, for both the multi-jet +\slashed{E}_T and mono-jet + \slashed{E}_T
final states. Our conclusion is that the former is still more efficient to
reveal a compressed SUSY spectrum first, while the latter can serve as a useful
confirmatory channel.
|
[
{
"created": "Mon, 30 Nov 2015 12:58:41 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2015 12:26:22 GMT",
"version": "v2"
}
] |
2016-01-19
|
[
[
"Dutta",
"Juhi",
""
],
[
"Konar",
"Partha",
""
],
[
"Mondal",
"Subhadeep",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Rai",
"Santosh Kumar",
""
]
] |
A compressed spectrum was initially proposed as an explanation for the elusiveness of low-energy supersymmetry (SUSY). Some characteristic signals at the Large Hadron Collider (LHC), such as mono-jet + \slashed{E}_T, had been propounded as its trademark signals. However, later investigations suggested that lower limits on the supersymmetric particle masses would be quite stringent in spite of compression. Also, most compressed SUSY scenarios studied so far are only partially compressed. In this backdrop, we make an exhaustive analysis of the compressed SUSY scenarios for the 13 TeV run of LHC, keeping the level of compression in the entire spectrum as high as possible. A broad class of benchmark spectra are thus considered, after ensuring consistency with the observed Higgs mass as well as the dark matter constraints. The rates of observable events in the high-energy run are obtained through detailed simulation, for both the multi-jet +\slashed{E}_T and mono-jet + \slashed{E}_T final states. Our conclusion is that the former is still more efficient to reveal a compressed SUSY spectrum first, while the latter can serve as a useful confirmatory channel.
|
1111.3884
|
Di-Lun Yang
|
Thomas Mehen and Di-Lun Yang
|
On the Role of Charmed Meson Loops in Charmonium Decays
|
16 pages, 3 figures, minor modifications, more references added
| null |
10.1103/PhysRevD.85.014002
|
INT-PUB-11-055
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the effect of intermediate charmed meson loops on the M1
radiative decays $J/\psi \to \eta_c \gamma$ and
$\psi'\rightarrow\eta^{(\prime)}_c\gamma$ as well as the isospin violating
hadronic decays $\psi'\rightarrow J/\psi \,\pi^0(\eta)$ using heavy hadron
chiral perturbation theory (HH$\chi$PT). The calculations include tree level as
well as one loop diagrams and are compared to the latest data from CLEO and
BES-III. Our fit constrains the couplings of 1S and 2S charmonium multiplets to
charmed mesons, denoted $g_2$ and $g_2^\prime$, respectively. We find that
there are two sets of solutions for $g_2$ and $g_2^\prime$. One set, which
agrees with previous values of the product $g_2 g_2^\prime$ extracted from
analyses that consider only loop contributions to $\psi'\rightarrow J/\psi
\,\pi^0(\eta)$, can only fit data on radiative decays with fine-tuned
cancellations between tree level diagrams and loops in that process. The other
solution for $g_2$ and $g_2^\prime$ leads to couplings that are smaller by a
factor of 2.3. In this case tree level and loop contributions are of comparable
size and the numerical values of the tree level contributions to radiative
decays are consistent with estimates based on the quark model as well as
non-relativistic QCD (NRQCD). This result shows that tree level HH$\chi$PT
couplings are as important as the one loop graphs with charmed mesons in these
charmonium decays. The couplings $g_2$ and $g_2^\prime$ are also important for
the calculations of the decays of charmed meson bound states, such as the
X(3872), to conventional charmonia.
|
[
{
"created": "Wed, 16 Nov 2011 17:46:08 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2011 19:38:06 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Mehen",
"Thomas",
""
],
[
"Yang",
"Di-Lun",
""
]
] |
We investigate the effect of intermediate charmed meson loops on the M1 radiative decays $J/\psi \to \eta_c \gamma$ and $\psi'\rightarrow\eta^{(\prime)}_c\gamma$ as well as the isospin violating hadronic decays $\psi'\rightarrow J/\psi \,\pi^0(\eta)$ using heavy hadron chiral perturbation theory (HH$\chi$PT). The calculations include tree level as well as one loop diagrams and are compared to the latest data from CLEO and BES-III. Our fit constrains the couplings of 1S and 2S charmonium multiplets to charmed mesons, denoted $g_2$ and $g_2^\prime$, respectively. We find that there are two sets of solutions for $g_2$ and $g_2^\prime$. One set, which agrees with previous values of the product $g_2 g_2^\prime$ extracted from analyses that consider only loop contributions to $\psi'\rightarrow J/\psi \,\pi^0(\eta)$, can only fit data on radiative decays with fine-tuned cancellations between tree level diagrams and loops in that process. The other solution for $g_2$ and $g_2^\prime$ leads to couplings that are smaller by a factor of 2.3. In this case tree level and loop contributions are of comparable size and the numerical values of the tree level contributions to radiative decays are consistent with estimates based on the quark model as well as non-relativistic QCD (NRQCD). This result shows that tree level HH$\chi$PT couplings are as important as the one loop graphs with charmed mesons in these charmonium decays. The couplings $g_2$ and $g_2^\prime$ are also important for the calculations of the decays of charmed meson bound states, such as the X(3872), to conventional charmonia.
|
hep-ph/0609245
|
Susan Gardner
|
S. Gardner
|
The Nucleon Electric Dipole Moment in Light-Front QCD
|
5 pages, LaTeX, based on talks at CAQCD, Minneapolis, MN, May 11-14,
2006 and at CIPANP, Puerto Rico, May 30- June 3, 2006, to appear in the
proceedings
|
AIPConf.Proc.870:336-338,2006
|
10.1063/1.2402648
| null |
hep-ph nucl-th
| null |
I present an exact relationship between the electric dipole moment and
anomalous magnetic moment of the nucleon in the light-front formalism of QCD
and consider its consequences.
|
[
{
"created": "Mon, 25 Sep 2006 02:10:25 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Gardner",
"S.",
""
]
] |
I present an exact relationship between the electric dipole moment and anomalous magnetic moment of the nucleon in the light-front formalism of QCD and consider its consequences.
|
2207.13519
|
Safura Sadeghi Barzani
|
S. Sadeghi Barzani
|
PB TMD fits at NLO with dynamical resolution scale
|
Contribution to the 2022 DIS conference: XXIX International Workshop
on Deep-Inelastic Scattering and Related Subjects
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Parton branching solutions of QCD evolution equations have recently been
studied to construct both collinear and transverse momentum dependent (TMD)
parton distributions. In this formalism, a soft-gluon resolution scale is
introduced to separate resolvable and non-resolvable branchings, and to take
into account soft-gluon coherence effects. In this talk, results of fits to the
high precision deep inelastic scattering (DIS) structure function measurements
are shown including for the first time the effects of dynamical, i.e.
branching-scale dependent, resolution scales at Next-to-Leading-Order (NLO)
accuracy in the strong coupling.
|
[
{
"created": "Wed, 27 Jul 2022 13:43:52 GMT",
"version": "v1"
}
] |
2022-07-28
|
[
[
"Barzani",
"S. Sadeghi",
""
]
] |
Parton branching solutions of QCD evolution equations have recently been studied to construct both collinear and transverse momentum dependent (TMD) parton distributions. In this formalism, a soft-gluon resolution scale is introduced to separate resolvable and non-resolvable branchings, and to take into account soft-gluon coherence effects. In this talk, results of fits to the high precision deep inelastic scattering (DIS) structure function measurements are shown including for the first time the effects of dynamical, i.e. branching-scale dependent, resolution scales at Next-to-Leading-Order (NLO) accuracy in the strong coupling.
|
1807.10024
|
Xabier Marcano
|
Asmaa Abada, Nicol\'as Bernal, Marta Losada, Xabier Marcano
|
Inclusive Displaced Vertex Searches for Heavy Neutral Leptons at the LHC
|
24 pages, 10 figures. Extended analysis. Published version
| null |
10.1007/JHEP01(2019)093
|
LPT-ORSAY-18-79, PI/UAN-2018-631FT
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The inclusion of heavy neutral leptons to the Standard Model particle content
could provide solutions to many open questions in particle physics and
cosmology. The modification of the charged and neutral currents from
active-sterile mixing of neutral leptons can provide novel signatures in
Standard Model processes. We revisit the displaced vertex signature that could
occur in collisions at the LHC via the decay of heavy neutral leptons with
masses of a few GeV emphasizing the implications of flavor, kinematics,
inclusive production and number of these extra neutral fermions. We study in
particular the implication on the parameter space sensitivity when all mixings
to active flavors are taken into account. We also discuss alternative cases
where the new particles are produced in a boosted regime.
|
[
{
"created": "Thu, 26 Jul 2018 09:16:04 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2019 16:28:20 GMT",
"version": "v2"
}
] |
2019-02-20
|
[
[
"Abada",
"Asmaa",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Losada",
"Marta",
""
],
[
"Marcano",
"Xabier",
""
]
] |
The inclusion of heavy neutral leptons to the Standard Model particle content could provide solutions to many open questions in particle physics and cosmology. The modification of the charged and neutral currents from active-sterile mixing of neutral leptons can provide novel signatures in Standard Model processes. We revisit the displaced vertex signature that could occur in collisions at the LHC via the decay of heavy neutral leptons with masses of a few GeV emphasizing the implications of flavor, kinematics, inclusive production and number of these extra neutral fermions. We study in particular the implication on the parameter space sensitivity when all mixings to active flavors are taken into account. We also discuss alternative cases where the new particles are produced in a boosted regime.
|
hep-ph/0612296
|
Raymond R. Volkas
|
R. R. Volkas
|
A_4 symmetry breaking scheme for understanding quark and lepton mixing
angles
|
4 pages. Invited talk at ICHEP 2006. To appear in the proceedings
| null | null | null |
hep-ph
| null |
The neutrino mixing matrix has been measured to be of a form consistent with
tribimaximal mixing, while the quark mixing matrix is almost diagonal. A scheme
based on flavour A_4 symmetry for understanding these patterns simultaneously
is presented.
|
[
{
"created": "Fri, 22 Dec 2006 03:41:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Volkas",
"R. R.",
""
]
] |
The neutrino mixing matrix has been measured to be of a form consistent with tribimaximal mixing, while the quark mixing matrix is almost diagonal. A scheme based on flavour A_4 symmetry for understanding these patterns simultaneously is presented.
|
hep-ph/9803404
| null |
N.V.Krasnikov
|
Phenomenology of $SU(3) \otimes SU(2) \otimes U(1)$ supersymmetric model
with Dirac neutrino masses
|
6 pages, latex
|
JETP Lett. 67 (1998) 766-769
|
10.1134/1.567745
|
Preprint INR 0914a/98
|
hep-ph
| null |
We consider supersymmetric extension of standard electroweak model with Dirac
neutrino masses. In such model for significant region of the parameters
right-handed tau sneutrino is the lightest superparticle and right-handed
charged tau slepton is the next to lightest superparticle. Due to the smallness
of the neutrino masses the right-handed tau slepton is long-lived particle that
changes the standard signatures used in the search for supersymmetry at
supercolliders. The most striking signatures of such scenario is the existence
of highly ionizing tracks and excess of multilepton events that is similar to
the phenomenology of gauge-mediated supersymmetry breaking models
|
[
{
"created": "Fri, 20 Mar 1998 14:05:14 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Krasnikov",
"N. V.",
""
]
] |
We consider supersymmetric extension of standard electroweak model with Dirac neutrino masses. In such model for significant region of the parameters right-handed tau sneutrino is the lightest superparticle and right-handed charged tau slepton is the next to lightest superparticle. Due to the smallness of the neutrino masses the right-handed tau slepton is long-lived particle that changes the standard signatures used in the search for supersymmetry at supercolliders. The most striking signatures of such scenario is the existence of highly ionizing tracks and excess of multilepton events that is similar to the phenomenology of gauge-mediated supersymmetry breaking models
|
1305.3598
|
Manoj Shrestha
|
H. Zhang, J. Tulpan, M. Shrestha, and D. M. Manley
|
Partial-wave analysis of $\bar K N$ scattering reactions
| null | null |
10.1103/PhysRevC.88.035204
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the two-body reactions $\bar K N\rightarrow \bar K N$, $\bar K
N\rightarrow \pi \Lambda$, and $\bar K N\rightarrow \pi \Sigma$ via
single-energy partial-wave analyses in the c.m.\ energy range 1480 to 2100 MeV.
The partial-wave amplitudes for these reactions thus extracted were constrained
by a multichannel energy-dependent model satisfying unitarity of the
partial-wave $S$-matrix. We obtain excellent predictions of differential cross
sections, polarizations, polarized cross sections, and cross sections for these
reactions from a global energy-dependent solution.
|
[
{
"created": "Wed, 15 May 2013 19:51:51 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2013 19:11:54 GMT",
"version": "v2"
}
] |
2013-09-18
|
[
[
"Zhang",
"H.",
""
],
[
"Tulpan",
"J.",
""
],
[
"Shrestha",
"M.",
""
],
[
"Manley",
"D. M.",
""
]
] |
We investigate the two-body reactions $\bar K N\rightarrow \bar K N$, $\bar K N\rightarrow \pi \Lambda$, and $\bar K N\rightarrow \pi \Sigma$ via single-energy partial-wave analyses in the c.m.\ energy range 1480 to 2100 MeV. The partial-wave amplitudes for these reactions thus extracted were constrained by a multichannel energy-dependent model satisfying unitarity of the partial-wave $S$-matrix. We obtain excellent predictions of differential cross sections, polarizations, polarized cross sections, and cross sections for these reactions from a global energy-dependent solution.
|
hep-ph/0203153
|
Maritza de Coss
|
Maritza de Coss and Rodrigo Huerta
|
Structure and texture of the quark mass matrix
|
7 pages, we use the macros of Elsevier
|
Mod.Phys.Lett.A17:1525-1532,2002
|
10.1142/S021773230200782X
| null |
hep-ph
| null |
Starting from a weak basis in which the up (or down) quark matrix is
diagonal, we obtain an exact set of equations for the quark mass matrix
elements in terms of known observables. We make a numerical analysis of the
down (up) quark mass matrix. Using the data available for the quark masses and
mixing angles at different energy scales, we found a numerical expression for
these matrices. We suggest that it is not possible to have an specific texture
from this analysis. We also examine the most general case when the complex
phases are introduced in the mass matrix. We find the numerical value for these
phases as a function of $\delta$, the CP-violationg phase.
|
[
{
"created": "Sat, 16 Mar 2002 00:10:29 GMT",
"version": "v1"
}
] |
2011-02-01
|
[
[
"de Coss",
"Maritza",
""
],
[
"Huerta",
"Rodrigo",
""
]
] |
Starting from a weak basis in which the up (or down) quark matrix is diagonal, we obtain an exact set of equations for the quark mass matrix elements in terms of known observables. We make a numerical analysis of the down (up) quark mass matrix. Using the data available for the quark masses and mixing angles at different energy scales, we found a numerical expression for these matrices. We suggest that it is not possible to have an specific texture from this analysis. We also examine the most general case when the complex phases are introduced in the mass matrix. We find the numerical value for these phases as a function of $\delta$, the CP-violationg phase.
|
hep-ph/0304196
|
Galoyan
|
A.S.Galoyan, A.Polanski
|
Simulation of antiproton-nucleus interactions in the framework of the
UrQMD model
|
18 pages, 15 figures
| null | null | null |
hep-ph
| null |
This paper proposes to apply the
Ultra-Relativistic Quantum Molecular Dynamic (UrQMD) approach to implement
the PANDA project (GSI).
Modeling of $\bar{p}$A-interactions has been performed at antiproton energies
from 1 GeV to 200 GeV by using the UrQMD model. We have studied average
multiplicities, multiplicity distributions of various types of secondary
particles, correlations between the multiplicities, rapidity, and transverse
momentum distributions of the particles. The UrQMD model predictions on
inelastic $\bar{p}$A- collisions have been found to reproduce qualitatively the
experimental data. However, to reach the quantitative agreement, especially, in
fragmentation regions, it is needed to modify the UrQMD model.
|
[
{
"created": "Mon, 21 Apr 2003 14:37:11 GMT",
"version": "v1"
},
{
"created": "Wed, 21 May 2003 15:29:01 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Galoyan",
"A. S.",
""
],
[
"Polanski",
"A.",
""
]
] |
This paper proposes to apply the Ultra-Relativistic Quantum Molecular Dynamic (UrQMD) approach to implement the PANDA project (GSI). Modeling of $\bar{p}$A-interactions has been performed at antiproton energies from 1 GeV to 200 GeV by using the UrQMD model. We have studied average multiplicities, multiplicity distributions of various types of secondary particles, correlations between the multiplicities, rapidity, and transverse momentum distributions of the particles. The UrQMD model predictions on inelastic $\bar{p}$A- collisions have been found to reproduce qualitatively the experimental data. However, to reach the quantitative agreement, especially, in fragmentation regions, it is needed to modify the UrQMD model.
|
0803.2584
|
Sabine Kraml
|
G. Belanger, O. Kittel, S. Kraml, H.-U. Martyn, A. Pukhov
|
Neutralino relic density from ILC measurements in the CPV MSSM
|
24 pages, 13 figures
|
Phys.Rev.D78:015011,2008
|
10.1103/PhysRevD.78.015011
|
BONN-TH-2008-04, LAPTH-1239/08, LPSC 0824
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss ILC measurements for a specific MSSM scenario with CP phases,
where the lightest neutralino is a good candidate for dark matter, annihilating
efficiently through t-channel exchange of light staus. These prospective
(CP-even) ILC measurements are then used to fit the underlying model
parameters. A collider prediction of the relic density of the neutralino from
this fit gives 0.116<Omega h^2<0.19 at 95% CL. CP-odd observables, while being
a direct signal of CP violation, do not help in further constraining Omega h^2.
The interplay with (in)direct detection of dark matter and with measurements of
electric dipole moments is also discussed. Finally we comment on collider
measurements at higher energies for refining the prediction of Omega h^2.
|
[
{
"created": "Tue, 18 Mar 2008 09:56:56 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Belanger",
"G.",
""
],
[
"Kittel",
"O.",
""
],
[
"Kraml",
"S.",
""
],
[
"Martyn",
"H. -U.",
""
],
[
"Pukhov",
"A.",
""
]
] |
We discuss ILC measurements for a specific MSSM scenario with CP phases, where the lightest neutralino is a good candidate for dark matter, annihilating efficiently through t-channel exchange of light staus. These prospective (CP-even) ILC measurements are then used to fit the underlying model parameters. A collider prediction of the relic density of the neutralino from this fit gives 0.116<Omega h^2<0.19 at 95% CL. CP-odd observables, while being a direct signal of CP violation, do not help in further constraining Omega h^2. The interplay with (in)direct detection of dark matter and with measurements of electric dipole moments is also discussed. Finally we comment on collider measurements at higher energies for refining the prediction of Omega h^2.
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.