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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1105.0583
|
Vladimir Galkin
|
D. Ebert, R. N. Faustov, V. O. Galkin
|
Spectroscopy and Regge trajectories of heavy baryons in the relativistic
quark-diquark picture
|
25 pages, 10 figures
|
Phys.Rev.D84:014025,2011
|
10.1103/PhysRevD.84.014025
|
HU-EP-11/21
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Mass spectra of heavy baryons are calculated in the
heavy-quark--light-diquark picture in the framework of the QCD-motivated
relativistic quark model. The dynamics of light quarks in the diquark as well
as the dynamics of the heavy quark and light diquark in the baryon are treated
completely relativistically without application of nonrelativistic v/c and
heavy quark 1/m_Q expansions. Such approach allows us to get predictions for
the heavy baryon masses for rather high orbital and radial excitations. On this
basis the Regge trajectories of heavy baryons for orbital and radial
excitations are constructed, and their linearity, parallelism, and equidistance
are verified. The relations between the slopes and intercepts of heavy baryons
are considered and a comparison of the slopes of Regge trajectories for heavy
baryons and heavy-light mesons is performed. All available experimental data on
heavy baryons fit nicely to the constructed Regge trajectories. The possible
assignment of the quantum numbers to the observed excited charmed baryons is
discussed.
|
[
{
"created": "Tue, 3 May 2011 13:46:04 GMT",
"version": "v1"
}
] |
2011-08-09
|
[
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] |
Mass spectra of heavy baryons are calculated in the heavy-quark--light-diquark picture in the framework of the QCD-motivated relativistic quark model. The dynamics of light quarks in the diquark as well as the dynamics of the heavy quark and light diquark in the baryon are treated completely relativistically without application of nonrelativistic v/c and heavy quark 1/m_Q expansions. Such approach allows us to get predictions for the heavy baryon masses for rather high orbital and radial excitations. On this basis the Regge trajectories of heavy baryons for orbital and radial excitations are constructed, and their linearity, parallelism, and equidistance are verified. The relations between the slopes and intercepts of heavy baryons are considered and a comparison of the slopes of Regge trajectories for heavy baryons and heavy-light mesons is performed. All available experimental data on heavy baryons fit nicely to the constructed Regge trajectories. The possible assignment of the quantum numbers to the observed excited charmed baryons is discussed.
|
1403.6826
|
Gordan Krnjaic
|
Eder Izaguirre, Gordan Krnjaic, Philip Schuster, and Natalia Toro
|
Physics Motivation for a Pilot Dark Matter Search at Jefferson
Laboratory
|
11 pages, 7 figures
|
Phys. Rev. D 90, 014052 (2014)
|
10.1103/PhysRevD.90.014052
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has recently been demonstrated that a program of parasitic electron-beam
fixed-target experiments would have powerful discovery potential for dark
matter and other new weakly-coupled particles in the MeV-GeV mass range. The
first stage of this program can be realized at Jefferson Laboratory using an
existing plastic-scintillator detector downstream of the Hall D electron beam
dump. This paper studies the physics potential of such an experiment and
highlights its unique sensitivity to inelastic "exciting" dark matter and
leptophilic dark matter scenarios. The first of these is kinematically
inaccessible at traditional direct detection experiments and features potential
"smoking gun" low-background signatures.
|
[
{
"created": "Wed, 26 Mar 2014 20:00:00 GMT",
"version": "v1"
}
] |
2014-08-06
|
[
[
"Izaguirre",
"Eder",
""
],
[
"Krnjaic",
"Gordan",
""
],
[
"Schuster",
"Philip",
""
],
[
"Toro",
"Natalia",
""
]
] |
It has recently been demonstrated that a program of parasitic electron-beam fixed-target experiments would have powerful discovery potential for dark matter and other new weakly-coupled particles in the MeV-GeV mass range. The first stage of this program can be realized at Jefferson Laboratory using an existing plastic-scintillator detector downstream of the Hall D electron beam dump. This paper studies the physics potential of such an experiment and highlights its unique sensitivity to inelastic "exciting" dark matter and leptophilic dark matter scenarios. The first of these is kinematically inaccessible at traditional direct detection experiments and features potential "smoking gun" low-background signatures.
|
0809.2359
|
Feng-Kun Guo
|
Feng-Kun Guo, Christoph Hanhart, Ulf-G. Mei{\ss}ner
|
Mass splittings within heavy baryon isospin multiplets in chiral
perturbation theory
|
15 pages, 2 figures
|
JHEP0809:136,2008
|
10.1088/1126-6708/2008/09/136
|
FZJ-IKP(TH)-2008-14, HISKP-TH-08-15
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the mass splittings within the heavy baryon isospin multiplets
\Sigma_{c(b)} and \Xi_{c(b)}' in chiral perturbation theory to leading one-loop
order. The pattern of the mass splittings in the \Sigma_c iso-triplet, which is
different from that of any other known isospin multiplet, can be explained. We
predict m_{\Xi_c'^+} - m_{\Xi_c'^0}=-0.2\pm0.6 MeV, m_{\Xi_b'^0} -
m_{\Xi_b'^-}=-4.0\pm1.9 MeV and the mass of the \Sigma_b^0 to be 5810.3\pm1.9
MeV.
|
[
{
"created": "Sat, 13 Sep 2008 17:51:46 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Guo",
"Feng-Kun",
""
],
[
"Hanhart",
"Christoph",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
We calculate the mass splittings within the heavy baryon isospin multiplets \Sigma_{c(b)} and \Xi_{c(b)}' in chiral perturbation theory to leading one-loop order. The pattern of the mass splittings in the \Sigma_c iso-triplet, which is different from that of any other known isospin multiplet, can be explained. We predict m_{\Xi_c'^+} - m_{\Xi_c'^0}=-0.2\pm0.6 MeV, m_{\Xi_b'^0} - m_{\Xi_b'^-}=-4.0\pm1.9 MeV and the mass of the \Sigma_b^0 to be 5810.3\pm1.9 MeV.
|
1905.03649
|
Alessio Notari
|
Alessio Notari, Daniele Bertacca
|
On systematic and GR effects on muon $g-2$ experiments
|
37 pages, 6 figures
| null |
10.1007/JHEP11(2019)030
| null |
hep-ph gr-qc hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive in full generality the equations that govern the time dependence of
the energy ${\mathcal E}$ of the decay electrons in a muon $g-2$ experiment. We
include both electromagnetic and gravitational effects and we estimate possible
systematics on the measurements of $g-2\equiv 2(1+a)$, whose experimental
uncertainty will soon reach $\Delta a/a\approx 10^{-7}$. In addition to the
standard modulation of ${\mathcal E}$ when the motion is orthogonal to a
constant magnetic field $B$, with angular frequency $\omega_a=e a |B|/m$, we
study effects due to: (1) a non constant muon $\gamma$ factor, in presence of
electric fields $E$, (2) a correction due to a component of the muon velocity
along $B$ (the `pitch correction'), (3) corrections to the precession rate due
to $E$ fields, (4) non-trivial spacetime metrics. Oscillations along the radial
and vertical directions of the muon lead to oscillations in ${\mathcal E}$ with
a relative size of order $10^{-6}$, for the BNL $g-2$ experiment. We then find
a subleading effect in the `pitch' correction, leading to a frequency shift of
$\Delta \omega_a/\omega_a \approx {\cal O}(10^{-9})$ and subleading effects of
about $\Delta \omega_a/\omega_a \approx {\rm few} \times {\cal
O}(10^{-8}-10^{-9})$ due to $E$ fields. Finally we show that GR effects are
dominated by the Coriolis force, due to the Earth rotation with angular
frequency $\omega_T$, leading to a correction of about $\Delta
\omega_a/\omega_a \approx \omega_T/(\gamma \omega_a) \approx {\cal
O}(10^{-12})$. A similar correction might be more appreciable for future
electron $g-2$ experiments, being of order $\Delta \omega_a/\omega_{a, {\rm
el}} \approx \omega_T/(\omega_{a, {\rm el}}) \approx 7\times 10^{-13}$,
compared to the present experimental uncertainty, $\Delta a_{\rm el}/a_{\rm
el}\approx 10^{-10}$, and forecasted to reach soon $\Delta a_{\rm el}/a_{\rm
el}\approx 10^{-11}$.
|
[
{
"created": "Thu, 9 May 2019 14:21:53 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Notari",
"Alessio",
""
],
[
"Bertacca",
"Daniele",
""
]
] |
We derive in full generality the equations that govern the time dependence of the energy ${\mathcal E}$ of the decay electrons in a muon $g-2$ experiment. We include both electromagnetic and gravitational effects and we estimate possible systematics on the measurements of $g-2\equiv 2(1+a)$, whose experimental uncertainty will soon reach $\Delta a/a\approx 10^{-7}$. In addition to the standard modulation of ${\mathcal E}$ when the motion is orthogonal to a constant magnetic field $B$, with angular frequency $\omega_a=e a |B|/m$, we study effects due to: (1) a non constant muon $\gamma$ factor, in presence of electric fields $E$, (2) a correction due to a component of the muon velocity along $B$ (the `pitch correction'), (3) corrections to the precession rate due to $E$ fields, (4) non-trivial spacetime metrics. Oscillations along the radial and vertical directions of the muon lead to oscillations in ${\mathcal E}$ with a relative size of order $10^{-6}$, for the BNL $g-2$ experiment. We then find a subleading effect in the `pitch' correction, leading to a frequency shift of $\Delta \omega_a/\omega_a \approx {\cal O}(10^{-9})$ and subleading effects of about $\Delta \omega_a/\omega_a \approx {\rm few} \times {\cal O}(10^{-8}-10^{-9})$ due to $E$ fields. Finally we show that GR effects are dominated by the Coriolis force, due to the Earth rotation with angular frequency $\omega_T$, leading to a correction of about $\Delta \omega_a/\omega_a \approx \omega_T/(\gamma \omega_a) \approx {\cal O}(10^{-12})$. A similar correction might be more appreciable for future electron $g-2$ experiments, being of order $\Delta \omega_a/\omega_{a, {\rm el}} \approx \omega_T/(\omega_{a, {\rm el}}) \approx 7\times 10^{-13}$, compared to the present experimental uncertainty, $\Delta a_{\rm el}/a_{\rm el}\approx 10^{-10}$, and forecasted to reach soon $\Delta a_{\rm el}/a_{\rm el}\approx 10^{-11}$.
|
hep-ph/9806393
|
Ansar Fayyazuddin
|
Fayyazuddin (Quaid-i-Azam University)
|
$\Lambda_b \to \Lambda + D (\bar{D}^0)$ decays and CP-violation
|
9 pages, 2 figures
|
Mod.Phys.Lett. A14 (1999) 63-70
|
10.1142/S0217732399000092
| null |
hep-ph
| null |
It is shown that interference of the amplitudes for the decays $\Lambda_b \to
\Lambda D$ and $\Lambda_b \to \Lambda \bar{D}^0$ gives rise to CP-violation.
|
[
{
"created": "Wed, 17 Jun 1998 13:40:58 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Fayyazuddin",
"",
"",
"Quaid-i-Azam University"
]
] |
It is shown that interference of the amplitudes for the decays $\Lambda_b \to \Lambda D$ and $\Lambda_b \to \Lambda \bar{D}^0$ gives rise to CP-violation.
|
hep-ph/0112141
|
Simone Donati
|
A. Bardi, A. Belloni, R. Carosi, A. Cerri, G. Chlachidze, M.
Dell'Orso, S. Donati, S. Galeotti, P. Giannetti, V. Glagolev, E. Meschi, F.
Morsani, D. Passuello, G. Punzi, L. Ristori, A. Semenov, F. Spinella, A.
Barchiesi, M. Rescigno, S. Sarkar, L. Zanello, M. Bari, S. Belforte, A.M.
Zanetti, I. Fiori, B. Ashmanskas, M. Baumgart, J. Berryhill, M. Bogdan, R.
Culbertson, H. Frisch, T. Nakaya, H. Sanders, M. Shochet, U. Yang, Y. Liu, L.
Moneta, T. Speer, X. Wu
|
The CDF-II Online Silicon Vertex Tracker
|
Invited talk at the ICALEPCS2001 Conference, Novermber 27-30, 2001,
San Jose, California, 5 pages, LaTex, 3 figures
|
eConf C011127:THBT003,2001
| null | null |
hep-ph
| null |
The Online Silicon Vertex Tracker is the new CDF-II level 2 trigger processor
designed to reconstruct 2-D tracks within the Silicon Vertex Detector with high
speed and accuracy. By performing a precise measurement of impact parameters
the SVT allows tagging online B events which typically show displaced secondary
vertices. Physics simulations show that this will greatly enhance the CDF-II
B-physics capability. The SVT has been fully assembled and operational since
the beginning of Tevatron RunII in April 2001. In this paper we briefly review
the SVT design and physics motivation and then describe its performance during
the early phase (April-October 2001) of run II.
|
[
{
"created": "Tue, 11 Dec 2001 00:09:22 GMT",
"version": "v1"
}
] |
2009-05-20
|
[
[
"Bardi",
"A.",
""
],
[
"Belloni",
"A.",
""
],
[
"Carosi",
"R.",
""
],
[
"Cerri",
"A.",
""
],
[
"Chlachidze",
"G.",
""
],
[
"Dell'Orso",
"M.",
""
],
[
"Donati",
"S.",
""
],
[
"Galeotti",
"S.",
""
],
[
"Giannetti",
"P.",
""
],
[
"Glagolev",
"V.",
""
],
[
"Meschi",
"E.",
""
],
[
"Morsani",
"F.",
""
],
[
"Passuello",
"D.",
""
],
[
"Punzi",
"G.",
""
],
[
"Ristori",
"L.",
""
],
[
"Semenov",
"A.",
""
],
[
"Spinella",
"F.",
""
],
[
"Barchiesi",
"A.",
""
],
[
"Rescigno",
"M.",
""
],
[
"Sarkar",
"S.",
""
],
[
"Zanello",
"L.",
""
],
[
"Bari",
"M.",
""
],
[
"Belforte",
"S.",
""
],
[
"Zanetti",
"A. M.",
""
],
[
"Fiori",
"I.",
""
],
[
"Ashmanskas",
"B.",
""
],
[
"Baumgart",
"M.",
""
],
[
"Berryhill",
"J.",
""
],
[
"Bogdan",
"M.",
""
],
[
"Culbertson",
"R.",
""
],
[
"Frisch",
"H.",
""
],
[
"Nakaya",
"T.",
""
],
[
"Sanders",
"H.",
""
],
[
"Shochet",
"M.",
""
],
[
"Yang",
"U.",
""
],
[
"Liu",
"Y.",
""
],
[
"Moneta",
"L.",
""
],
[
"Speer",
"T.",
""
],
[
"Wu",
"X.",
""
]
] |
The Online Silicon Vertex Tracker is the new CDF-II level 2 trigger processor designed to reconstruct 2-D tracks within the Silicon Vertex Detector with high speed and accuracy. By performing a precise measurement of impact parameters the SVT allows tagging online B events which typically show displaced secondary vertices. Physics simulations show that this will greatly enhance the CDF-II B-physics capability. The SVT has been fully assembled and operational since the beginning of Tevatron RunII in April 2001. In this paper we briefly review the SVT design and physics motivation and then describe its performance during the early phase (April-October 2001) of run II.
|
hep-ph/9611262
|
shunzo Kumano
|
S. Kumano (Saga University)
|
Flavor asymmetry $\bar u-\bar d$ in the nucleon
|
6 pages, LATEX with epsf.sty and wrapfig.sty, 4 eps figures. Talk
given at the Circum-Pan-Pacific Workshop on High Energy Spin Physics. Kobe,
Japan, October 2 - 4, 1996. Complete postscript file including the figures is
available at ftp://ftp.cc.saga-u.ac.jp/pub/paper/riko/quantum1 or at
http://www.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.html
| null | null |
SAGA-HE-111-96
|
hep-ph
| null |
We give a brief summary of the Gottfried sum rule and a flavor asymmetric
distribution $\bar u-\bar d$ in the nucleon. First, experimental history of the
sum-rule studies is discussed. Second, future prospects for studying the
asymmetry at Fermilab and RHIC are discussed. We also comment on possible
nuclear modification.
|
[
{
"created": "Thu, 7 Nov 1996 09:59:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kumano",
"S.",
"",
"Saga University"
]
] |
We give a brief summary of the Gottfried sum rule and a flavor asymmetric distribution $\bar u-\bar d$ in the nucleon. First, experimental history of the sum-rule studies is discussed. Second, future prospects for studying the asymmetry at Fermilab and RHIC are discussed. We also comment on possible nuclear modification.
|
hep-ph/0301256
|
Robert Fleischer
|
Robert Fleischer (CERN)
|
A Closer Look at $B_{d,s}\to D f_r$ Decays and Novel Avenues to
Determine $\gamma$
|
37 pages, 5 figures, sign error in factorization prediction for
cos(delta) corrected and numerical examples modified accordingly, conclusions
unchanged
|
Nucl.Phys.B659:321-355,2003
|
10.1016/S0550-3213(03)00225-6
|
CERN-TH/2003-011
|
hep-ph
| null |
Decays of neutral B mesons originating from $b\to D r$ $(r\in\{s,d\})$
processes, i.e. $B_d\to DK_{S(L)}$, $B_s\to D\eta^{(')}, D\phi, ...$ $(r=s)$
and $B_s\to DK_{S(L)}$, $B_d\to D\pi^0, D\rho^0, ...$ $(r=d)$ modes, offer
valuable insights into CP violation. Here the neutral $D$ mesons may be
observed through $D\to f_\pm$ or $D\to f_{NE}$, where $f_\pm$ and $f_{NE}$ are
CP eigenstates and CP non-eigenstates, respectively. Recently, we pointed out
that ``untagged'' and mixing-induced CP-violating $B_{d,s}\to D_\pm f_s$
observables provide a very efficient, theoretically clean determination of the
angle $\gamma$ of the unitarity triangle. Here we perform a more detailed
analysis of the $B_{d,s}\to D[\to f_\pm]f_s$ channels, and focus on $B_{d,s}\to
D[\to f_{NE}] f_s$, where interference effects between Cabibbo-favoured and
doubly Cabibbo-suppressed D-meson decays lead to complications. We show that
$\gamma$ can nevertheless be determined in an elegant and essentially
unambiguous manner from the $B_{d,s}\to D[\to f_{NE}]f_s$ observables with the
help of the corresponding ``untagged'' $B_{d,s}\to D[\to f_\pm]f_s$
measurements. Moreover, we may also extract hadronic B- and D-decay parameters.
Several interesting features of decays of the kind $B_{d,s}\to D f_d$ are also
pointed out.
|
[
{
"created": "Wed, 29 Jan 2003 11:50:01 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2003 10:13:13 GMT",
"version": "v2"
}
] |
2010-11-23
|
[
[
"Fleischer",
"Robert",
"",
"CERN"
]
] |
Decays of neutral B mesons originating from $b\to D r$ $(r\in\{s,d\})$ processes, i.e. $B_d\to DK_{S(L)}$, $B_s\to D\eta^{(')}, D\phi, ...$ $(r=s)$ and $B_s\to DK_{S(L)}$, $B_d\to D\pi^0, D\rho^0, ...$ $(r=d)$ modes, offer valuable insights into CP violation. Here the neutral $D$ mesons may be observed through $D\to f_\pm$ or $D\to f_{NE}$, where $f_\pm$ and $f_{NE}$ are CP eigenstates and CP non-eigenstates, respectively. Recently, we pointed out that ``untagged'' and mixing-induced CP-violating $B_{d,s}\to D_\pm f_s$ observables provide a very efficient, theoretically clean determination of the angle $\gamma$ of the unitarity triangle. Here we perform a more detailed analysis of the $B_{d,s}\to D[\to f_\pm]f_s$ channels, and focus on $B_{d,s}\to D[\to f_{NE}] f_s$, where interference effects between Cabibbo-favoured and doubly Cabibbo-suppressed D-meson decays lead to complications. We show that $\gamma$ can nevertheless be determined in an elegant and essentially unambiguous manner from the $B_{d,s}\to D[\to f_{NE}]f_s$ observables with the help of the corresponding ``untagged'' $B_{d,s}\to D[\to f_\pm]f_s$ measurements. Moreover, we may also extract hadronic B- and D-decay parameters. Several interesting features of decays of the kind $B_{d,s}\to D f_d$ are also pointed out.
|
1812.09341
|
Volodymyr Takhistov
|
Mu-Chun Chen, Volodymyr Takhistov
|
Baryogenesis, Dark Matter, and Flavor Structure in Non-thermal Moduli
Cosmology
|
26 pages; v2: published version
|
JHEP 1905 (2019) 101
|
10.1007/JHEP05(2019)101
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The appearance of scalar/moduli fields in the early universe, as motivated by
string theory, naturally leads to non-thermal "moduli cosmology". Such
cosmology provides a consistent framework where the generation of radiation,
baryons, and dark matter can occur while maintaining successful Big Bang
Nucleosynthesis and avoiding the cosmological moduli problem. We present a
relatively economical construction with moduli cosmology, building on a variety
of string-inspired components (e.g. supersymmetry, discrete symmetries,
Green-Schwarz anomaly cancellation). We address a range of outstanding problems
of particle physics and cosmology simultaneously, including the fermion mass
hierarchy and flavor puzzle, the smallness of neutrino masses, baryogenesis and
dark matter. Our setup, based on discrete $\mathrm{Z}_{12}^{R}$ symmetry and
anomalous $\mathrm{U}(1)_A$, is void of the usual issues plaguing the Minimal
Supersymmetric Standard Model, i.e. the $\mu$-problem and the overly-rapid
proton decay due to dimension-4,-5 operators. The model is compatible with
$\mathrm{SU}(5)$ Grand Unification. The smallness of Dirac neutrino masses is
automatically established by requiring the cancellation of mixed
gravitational-gauge anomalies. The decay of the moduli field provides a common
origin for the baryon number and dark matter abundance, explaining the observed
cosmic coincidences, $\Omega_{B} \sim \Omega_{DM}$.
|
[
{
"created": "Fri, 21 Dec 2018 19:15:07 GMT",
"version": "v1"
},
{
"created": "Sun, 26 May 2019 19:45:59 GMT",
"version": "v2"
}
] |
2019-05-28
|
[
[
"Chen",
"Mu-Chun",
""
],
[
"Takhistov",
"Volodymyr",
""
]
] |
The appearance of scalar/moduli fields in the early universe, as motivated by string theory, naturally leads to non-thermal "moduli cosmology". Such cosmology provides a consistent framework where the generation of radiation, baryons, and dark matter can occur while maintaining successful Big Bang Nucleosynthesis and avoiding the cosmological moduli problem. We present a relatively economical construction with moduli cosmology, building on a variety of string-inspired components (e.g. supersymmetry, discrete symmetries, Green-Schwarz anomaly cancellation). We address a range of outstanding problems of particle physics and cosmology simultaneously, including the fermion mass hierarchy and flavor puzzle, the smallness of neutrino masses, baryogenesis and dark matter. Our setup, based on discrete $\mathrm{Z}_{12}^{R}$ symmetry and anomalous $\mathrm{U}(1)_A$, is void of the usual issues plaguing the Minimal Supersymmetric Standard Model, i.e. the $\mu$-problem and the overly-rapid proton decay due to dimension-4,-5 operators. The model is compatible with $\mathrm{SU}(5)$ Grand Unification. The smallness of Dirac neutrino masses is automatically established by requiring the cancellation of mixed gravitational-gauge anomalies. The decay of the moduli field provides a common origin for the baryon number and dark matter abundance, explaining the observed cosmic coincidences, $\Omega_{B} \sim \Omega_{DM}$.
|
2201.04997
|
Li-Sheng Geng
|
Zhi-Wei Liu, Kai-Wen Li, and Li-Sheng Geng
|
Strangeness $S = -2$ baryon-baryon interactions and femtoscopic
correlation functions in covariant chiral effective field theory
|
21 pages, 17 figures; version accepted for publication in Chinese
Physics C
| null |
10.1088/1674-1137/ac988a
| null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the baryon-baryon interactions with strangeness $S = -2$ and
corresponding momentum correlation functions in leading order covariant chiral
effective field theory. The relevant low energy constants are determined by
fitting to the latest HAL QCD simulations, taking into account all the coupled
channels. Extrapolating the so-obtained strong interactions to the physical
point and considering both quantum statistical effects and the Coulomb
interaction, we calculate the $\Lambda\Lambda$ and $\Xi^-p$ correlation
functions with a spherical Gaussian source and compare them with the recent
experimental data. We find remarkable agreement between our predictions and the
experimental measurements by using the source radius determined in
proton-proton correlations, which demonstrates the consistency between theory,
experiment, and lattice QCD simulations. Moreover, we predict the
$\Sigma^+\Sigma^+$, $\Sigma^+\Lambda$, and $\Sigma^+\Sigma^-$ interactions and
corresponding momentum correlation functions. We further investigate the
influence of the source shape and size of the hadron pair on the correlation
functions studied and show that the current data are not very sensitive to the
source shape. Future experimental measurement of the predicted momentum
correlation functions will provide a non-trivial test of not only SU(3) flavor
symmetry and its breaking but also the baryon-baryon interactions derived in
covariant chiral effective field theory.
|
[
{
"created": "Thu, 13 Jan 2022 14:22:32 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jun 2022 14:03:43 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Oct 2022 13:23:58 GMT",
"version": "v3"
}
] |
2023-01-25
|
[
[
"Liu",
"Zhi-Wei",
""
],
[
"Li",
"Kai-Wen",
""
],
[
"Geng",
"Li-Sheng",
""
]
] |
We study the baryon-baryon interactions with strangeness $S = -2$ and corresponding momentum correlation functions in leading order covariant chiral effective field theory. The relevant low energy constants are determined by fitting to the latest HAL QCD simulations, taking into account all the coupled channels. Extrapolating the so-obtained strong interactions to the physical point and considering both quantum statistical effects and the Coulomb interaction, we calculate the $\Lambda\Lambda$ and $\Xi^-p$ correlation functions with a spherical Gaussian source and compare them with the recent experimental data. We find remarkable agreement between our predictions and the experimental measurements by using the source radius determined in proton-proton correlations, which demonstrates the consistency between theory, experiment, and lattice QCD simulations. Moreover, we predict the $\Sigma^+\Sigma^+$, $\Sigma^+\Lambda$, and $\Sigma^+\Sigma^-$ interactions and corresponding momentum correlation functions. We further investigate the influence of the source shape and size of the hadron pair on the correlation functions studied and show that the current data are not very sensitive to the source shape. Future experimental measurement of the predicted momentum correlation functions will provide a non-trivial test of not only SU(3) flavor symmetry and its breaking but also the baryon-baryon interactions derived in covariant chiral effective field theory.
|
hep-ph/0005290
|
Yury F. Pirogov
|
Yu. F. Pirogov (IHEP, Protvino and MIPT, Moscow)
|
Parametrizing and rephasing neutrino mixing
|
25 pages, LaTeX
|
Phys.Atom.Nucl. 65 (2002) 109-120; Yad.Fiz. 65 (2002) 114-125
|
10.1134/1.1446562
|
IHEP 2000-12
|
hep-ph
| null |
Neutrino mixing in the standard model extensions, both renormalizable and
effective, with arbitrary numbers of the singlet and left-handed doublet
neutrinos is investigated in a systematic fashion. The charged and neutral (the
Z and Higgs mediated)lepton currents are written under general Majorana
condition, and the odservable independence of the choice of the condition, the
rephasing invariance, is studied. A parametrization of the neutrino mixing
matrices in the doublet-singlet factorized form is developed. Its relationship
with the see-saw mechanism is shown in the limit of a small doublet-singlet
mixing. The structure of the mixing matrices relevant to the neutrino
oscillation experiments is explicated.
|
[
{
"created": "Mon, 29 May 2000 19:12:58 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Pirogov",
"Yu. F.",
"",
"IHEP, Protvino and MIPT, Moscow"
]
] |
Neutrino mixing in the standard model extensions, both renormalizable and effective, with arbitrary numbers of the singlet and left-handed doublet neutrinos is investigated in a systematic fashion. The charged and neutral (the Z and Higgs mediated)lepton currents are written under general Majorana condition, and the odservable independence of the choice of the condition, the rephasing invariance, is studied. A parametrization of the neutrino mixing matrices in the doublet-singlet factorized form is developed. Its relationship with the see-saw mechanism is shown in the limit of a small doublet-singlet mixing. The structure of the mixing matrices relevant to the neutrino oscillation experiments is explicated.
|
1401.1507
|
Asmaa Abada
|
Asmaa Abada and Michele Lucente
|
Looking for the minimal inverse seesaw realisation
|
29 pages, 14 figures. In V2, one paragraph, one figure, 3 references
and few minor comments added. Title slightly changed
|
Nucl. Phys. B 885 (2014) 651
|
10.1016/j.nuclphysb.2014.06.003
|
LPT-Orsay 13-39, SISSA 59/2013/FISI
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we consider a simple extension of the Standard Model involving
additional fermionic singlets and assume an underlying inverse seesaw mechanism
(with one or more right-handed neutrinos and one or more sterile fermions) for
neutrino mass generation. Under the assumption that both sterile states and
right-handed neutrinos are present, our goal is to determine which is the
minimal inverse seesaw realisation that accounts for neutrino data while at the
same time complying with all experimental requirements (electroweak precision
tests and laboratory constraints). This study aims at identifying the minimal
inverse seesaw realisation for the 3-flavour and for the 3 +~more-mixing
schemes, the latter giving an explanation for the reactor anomalies and/or
providing a possible candidate for the dark matter of the Universe. Based on a
perturbative approach, our generic study shows that in the class of inverse
seesaw models giving rise to a 3-flavour flavour mixing scheme, only two mass
scales are relevant (the light neutrino mass scale, $m_\nu$ and the mass of the
right-handed neutrinos, $M_R$) while in the case of a 3 + 1-mixing scheme, an
additional mass scale ($\mu$ $\in[m_\nu,M_R]$) is required. For each of the two
obtained inverse seesaw frameworks, we conduct a thorough numerical analysis,
providing predictions for the hierarchy of the light neutrino spectrum and for
the effective mass in neutrinoless double beta decay.
|
[
{
"created": "Tue, 7 Jan 2014 21:01:01 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2014 16:53:23 GMT",
"version": "v2"
}
] |
2014-07-16
|
[
[
"Abada",
"Asmaa",
""
],
[
"Lucente",
"Michele",
""
]
] |
In this work we consider a simple extension of the Standard Model involving additional fermionic singlets and assume an underlying inverse seesaw mechanism (with one or more right-handed neutrinos and one or more sterile fermions) for neutrino mass generation. Under the assumption that both sterile states and right-handed neutrinos are present, our goal is to determine which is the minimal inverse seesaw realisation that accounts for neutrino data while at the same time complying with all experimental requirements (electroweak precision tests and laboratory constraints). This study aims at identifying the minimal inverse seesaw realisation for the 3-flavour and for the 3 +~more-mixing schemes, the latter giving an explanation for the reactor anomalies and/or providing a possible candidate for the dark matter of the Universe. Based on a perturbative approach, our generic study shows that in the class of inverse seesaw models giving rise to a 3-flavour flavour mixing scheme, only two mass scales are relevant (the light neutrino mass scale, $m_\nu$ and the mass of the right-handed neutrinos, $M_R$) while in the case of a 3 + 1-mixing scheme, an additional mass scale ($\mu$ $\in[m_\nu,M_R]$) is required. For each of the two obtained inverse seesaw frameworks, we conduct a thorough numerical analysis, providing predictions for the hierarchy of the light neutrino spectrum and for the effective mass in neutrinoless double beta decay.
|
1108.1263
|
Antonio Pineda
|
Antonio Pineda
|
Brief review of the theory of the muonic hydrogen Lamb shift and the
proton radius
|
12 pages, 6 figures. Plenary talk at XIV International Conference on
Hadron Spectroscopy (hadron2011), 13-17 June 2011, Munich, Germany
| null | null | null |
hep-ph nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently the muonic hydrogen lamb shift has been measured with unprecedented
accuracy, allowing for a precise determination of the proton radius. This
determination is 5 sigma away from the previous CODATA value obtained from
(mainly) the hydrogen lamb shift and the electron-proton scattering. Within an
effective field theory formalism, I will define the proton radius and briefly
review some aspects of the theoretical prediction for the muonic hydrogen lamb
shift, studying both the pure QED-like computation and the hadronic effects.
|
[
{
"created": "Fri, 5 Aug 2011 07:31:36 GMT",
"version": "v1"
}
] |
2011-08-08
|
[
[
"Pineda",
"Antonio",
""
]
] |
Recently the muonic hydrogen lamb shift has been measured with unprecedented accuracy, allowing for a precise determination of the proton radius. This determination is 5 sigma away from the previous CODATA value obtained from (mainly) the hydrogen lamb shift and the electron-proton scattering. Within an effective field theory formalism, I will define the proton radius and briefly review some aspects of the theoretical prediction for the muonic hydrogen lamb shift, studying both the pure QED-like computation and the hadronic effects.
|
2204.07263
|
Bai-Song Xie
|
Orkash Amat, Li-Na Hu, Adiljan Sawut, Melike Mohamedsedik, M. A. Bake
and B. S. Xie
|
Schwinger pair production rate and time for some space-dependent
electromagnetic fields via worldline instantons formalism
|
13 pages, 11 figures
| null |
10.1140/epjd/s10053-022-00519-y
| null |
hep-ph quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Schwinger pair production in some of space-dependent electromagnetic fields
is studied analytically by using worldline instantons formalism for scalar
quantum electrodynamics. With the increase of the modified Keldysh parameter
$\gamma_{keb}$, the pair production rate decreases, the region of instanton
paths expands regardless of the electromagnetic field form. We also find that
all of the paths of the instantons for various electromagnetic fields are
exactly in the same plane while with the different elliptical shapes. Moreover,
the magnitudes of the normalized instantons action with different external
electromagnetic fields are all bounded within the region from $\pi$ to $2\pi$
in spatial inhomogeneity fields. We further analytically identify and obtain
two kinds of the pair-production time associated to the worldline instantons
action.
|
[
{
"created": "Thu, 14 Apr 2022 23:03:11 GMT",
"version": "v1"
}
] |
2022-10-26
|
[
[
"Amat",
"Orkash",
""
],
[
"Hu",
"Li-Na",
""
],
[
"Sawut",
"Adiljan",
""
],
[
"Mohamedsedik",
"Melike",
""
],
[
"Bake",
"M. A.",
""
],
[
"Xie",
"B. S.",
""
]
] |
Schwinger pair production in some of space-dependent electromagnetic fields is studied analytically by using worldline instantons formalism for scalar quantum electrodynamics. With the increase of the modified Keldysh parameter $\gamma_{keb}$, the pair production rate decreases, the region of instanton paths expands regardless of the electromagnetic field form. We also find that all of the paths of the instantons for various electromagnetic fields are exactly in the same plane while with the different elliptical shapes. Moreover, the magnitudes of the normalized instantons action with different external electromagnetic fields are all bounded within the region from $\pi$ to $2\pi$ in spatial inhomogeneity fields. We further analytically identify and obtain two kinds of the pair-production time associated to the worldline instantons action.
|
hep-ph/9804465
|
Leonid Burakovsky
|
L. Burakovsky
|
Glueball Spectroscopy in Regge Phenomenology
|
8 pages, LaTeX. Contribution to the PRQT '98 Conference, Houston,
Texas, Feb 9-11, 1998
|
Found.Phys.28:1595-1605,1998
|
10.1023/A:1018842519801
|
LA-UR-98-1695
|
hep-ph
| null |
We show that linear Regge trajectories for mesons and glueballs, and the
cubic mass spectrum associated with them, determine a relation between the
masses of the \rho meson and the scalar glueball, M(0^{++})=3/\sqrt{2} M(\rho
), which implies M(0^{++})=1620\pm 10 MeV. We also discuss relations between
the masses of the scalar and tensor and 3^{--} glueballs, M(2^{++})=\sqrt{2}
M(0^{++}), M(3^{--})=2M(0^{++}), which imply M(2^{++})=2290\pm 15 MeV,
M(3^{++})=3240\pm 20 MeV.
|
[
{
"created": "Thu, 30 Apr 1998 19:52:52 GMT",
"version": "v1"
}
] |
2010-05-27
|
[
[
"Burakovsky",
"L.",
""
]
] |
We show that linear Regge trajectories for mesons and glueballs, and the cubic mass spectrum associated with them, determine a relation between the masses of the \rho meson and the scalar glueball, M(0^{++})=3/\sqrt{2} M(\rho ), which implies M(0^{++})=1620\pm 10 MeV. We also discuss relations between the masses of the scalar and tensor and 3^{--} glueballs, M(2^{++})=\sqrt{2} M(0^{++}), M(3^{--})=2M(0^{++}), which imply M(2^{++})=2290\pm 15 MeV, M(3^{++})=3240\pm 20 MeV.
|
1806.07594
|
Zhe Xu
|
Zhengyu Chen, Carsten Greiner, Zhe Xu, Pengfei Zhuang
|
Shear viscosity of ultrarelativistic Boson systems in the presence of a
Bose-Einstein condensate
|
11 pages, 3 figures, matches published version
|
Phys. Rev. C 100, 014906 (2019)
|
10.1103/PhysRevC.100.014906
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate for the first time the shear viscosity of ultrarelativistic
Boson systems in the presence of a Bose-Einstein condensate (BEC). Two
different methods are used. One is the Grad's method of moments and another is
the Green-Kubo relation within a kinetic transport approach. In this work we
consider a Boson system with isotropic elastic collisions and a gluon system
with elastic scatterings described by perturbation QCD (pQCD). The results show
that the presence of a BEC lowers the shear viscosity. This effect becomes
stronger for the increasing proportion of the BEC in the Boson system and is
insensitive to the detail of interactions.
|
[
{
"created": "Wed, 20 Jun 2018 07:48:09 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Nov 2019 05:46:20 GMT",
"version": "v2"
}
] |
2019-11-19
|
[
[
"Chen",
"Zhengyu",
""
],
[
"Greiner",
"Carsten",
""
],
[
"Xu",
"Zhe",
""
],
[
"Zhuang",
"Pengfei",
""
]
] |
We calculate for the first time the shear viscosity of ultrarelativistic Boson systems in the presence of a Bose-Einstein condensate (BEC). Two different methods are used. One is the Grad's method of moments and another is the Green-Kubo relation within a kinetic transport approach. In this work we consider a Boson system with isotropic elastic collisions and a gluon system with elastic scatterings described by perturbation QCD (pQCD). The results show that the presence of a BEC lowers the shear viscosity. This effect becomes stronger for the increasing proportion of the BEC in the Boson system and is insensitive to the detail of interactions.
|
1105.5431
|
Sannino Francesco
|
Eugenio Del Nobile, Chris Kouvaris, Francesco Sannino (CP3-Origins &
DIAS)
|
Interfering Composite Asymmetric Dark Matter for DAMA and CoGeNT
|
4 pages, 2 figures, 2 columns
|
Phys.Rev.D84:027301,2011
|
10.1103/PhysRevD.84.027301
|
CP3-Origins-2011-18 & DIAS-2011-04
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a simple mechanism for reconciling the direct dark matter
experimental results. We consider light asymmetric composite dark matter which
scatters off nuclei via Higgs and photon exchange. We demonstrate that the
interference between these two channels naturally accommodates the experimental
results. We discover that this happens for a compositeness scale of the order
of the electroweak. We also provide a model realization based on strong
dynamics at the electroweak scale.
|
[
{
"created": "Fri, 27 May 2011 00:06:35 GMT",
"version": "v1"
}
] |
2011-08-08
|
[
[
"Del Nobile",
"Eugenio",
"",
"CP3-Origins &\n DIAS"
],
[
"Kouvaris",
"Chris",
"",
"CP3-Origins &\n DIAS"
],
[
"Sannino",
"Francesco",
"",
"CP3-Origins &\n DIAS"
]
] |
We provide a simple mechanism for reconciling the direct dark matter experimental results. We consider light asymmetric composite dark matter which scatters off nuclei via Higgs and photon exchange. We demonstrate that the interference between these two channels naturally accommodates the experimental results. We discover that this happens for a compositeness scale of the order of the electroweak. We also provide a model realization based on strong dynamics at the electroweak scale.
|
1409.7918
|
Alex Gomes Dias
|
Alex G. Dias
|
Intermediate Scale Accidental Axion and ALPs
|
4 pages. To appear in the Proceedings of the 10th Patras Workshop on
Axions, WIMPs and WISPs, CERN, 29 June - 04 July 2014
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the problem of constructing models containing an axion and
axion-like particles, motivated by astrophysical observations, with decay
constants at the intermediate scale ranging from $10^9$GeV to $10^{13}$GeV. We
present examples in which the axion and axion-like particles arise accidentally
as pseudo Nambu-Goldstone bosons of automatic global chiral symmetries, in
models having exact discrete symmetries.
|
[
{
"created": "Sun, 28 Sep 2014 14:53:26 GMT",
"version": "v1"
}
] |
2014-09-30
|
[
[
"Dias",
"Alex G.",
""
]
] |
We discuss the problem of constructing models containing an axion and axion-like particles, motivated by astrophysical observations, with decay constants at the intermediate scale ranging from $10^9$GeV to $10^{13}$GeV. We present examples in which the axion and axion-like particles arise accidentally as pseudo Nambu-Goldstone bosons of automatic global chiral symmetries, in models having exact discrete symmetries.
|
hep-ph/9403390
|
Juerg Gasser
|
J. Bijnens, G. Colangelo and J. Gasser
|
$K_{l4}$ - Decays Beyond One Loop
|
31 pages, LaTex, 3 figs. (two figures appended as postscript file),
BUTP-94/4,ROMF2 94/05
|
Nucl.Phys.B427:427-454,1994
|
10.1016/0550-3213(94)90634-3
| null |
hep-ph
| null |
The matrix elements for $K\rightarrow \pi \pi \l \nu$ decays are described by
four form factors $F,G,H$ and $R$. We complete previous calculations by
evaluating $R$ at next-to-leading order in the low-energy expansion. We then
estimate higher order contributions using dispersion relations and determine
the low-energy constants $L_1,L_2$ and $L_3$ from data on $K_{e4}$ decays and
on elastic pion scattering. Finally, we present predictions for the slope of
the form factor $G$ and for total decay rates.
|
[
{
"created": "Wed, 30 Mar 1994 09:02:39 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Bijnens",
"J.",
""
],
[
"Colangelo",
"G.",
""
],
[
"Gasser",
"J.",
""
]
] |
The matrix elements for $K\rightarrow \pi \pi \l \nu$ decays are described by four form factors $F,G,H$ and $R$. We complete previous calculations by evaluating $R$ at next-to-leading order in the low-energy expansion. We then estimate higher order contributions using dispersion relations and determine the low-energy constants $L_1,L_2$ and $L_3$ from data on $K_{e4}$ decays and on elastic pion scattering. Finally, we present predictions for the slope of the form factor $G$ and for total decay rates.
|
1209.6305
|
Martin Hentschinski
|
F. Hautmann, M. Hentschinski and H. Jung
|
Unintegrated sea quark at small x and vector boson production
|
4 pages, 4 figures. Based on a talk presented at the 47th Rencontres
de Moriond, QCD and High Energy Interactions, 10-17 March 2012, La Thuile,
Italy
| null | null |
IFT-UAM/CSIC-12-45
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss recent work on the transverse momentum dependent sea quark density
and its application to forward Drell-Yan production.
|
[
{
"created": "Thu, 27 Sep 2012 17:54:09 GMT",
"version": "v1"
}
] |
2012-09-28
|
[
[
"Hautmann",
"F.",
""
],
[
"Hentschinski",
"M.",
""
],
[
"Jung",
"H.",
""
]
] |
We discuss recent work on the transverse momentum dependent sea quark density and its application to forward Drell-Yan production.
|
1206.0199
|
Michael Baker
|
Michael J. Baker, J. Bordes, H. M. Chan, S. T. Tsou
|
A Comprehensive Mechanism Reproducing the Mass and Mixing Parameters of
Quarks and Leptons
|
37 pages, 1 figure
| null |
10.1142/S0217751X1350070X
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that if, from the starting point of a universal rank-one mass
matrix long favoured by phenomenologists, one adds the assumption that it
rotates (changes its orientation in generation space) with changing scale, one
can reproduce, in terms of only 6 real parameters, all the 16 mass ratios and
mixing parameters of quarks and leptons. Of these 16 quantities so reproduced,
10 for which data exist for direct comparison (i.e. the CKM elements including
the CP-violating phase, the angles $\theta_{12}, \theta_{13}, \theta_{23}$ in
$\nu$-oscillation, and the masses $m_c, m_\mu, m_e$) agree well with
experiment, mostly to within experimental errors; 4 others ($m_s, m_u, m_d,
m_{\nu_2}$), the experimental values for which can only be inferred, agree
reasonably well; while 2 others ($m_{\nu_1}, \delta_{CP}$ for leptons), not yet
measured experimentally, remain as predictions. In addition, one gets as
bonuses, estimates for (i) the right-handed neutrino mass $m_{\nu_R}$ and (ii)
the strong CP angle $\theta$ inherent in QCD. One notes in particular that the
output value for $\sin^2 2 \theta_{13}$ from the fit agrees very well with
recent experiments. By inputting the current experimental value with its error,
one obtains further from the fit 2 new testable constraints: (i) that
$\theta_{23}$ must depart from its "maximal" value: $\sin^2 2 \theta_{23} \sim
0.935 \pm 0.021$, (ii) that the CP-violating (Dirac) phase in the PMNS would be
smaller than in the CKM matrix: of order only $|\sin \delta_{CP}| \leq 0.31$ if
not vanishing altogether.
|
[
{
"created": "Fri, 1 Jun 2012 14:37:26 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Baker",
"Michael J.",
""
],
[
"Bordes",
"J.",
""
],
[
"Chan",
"H. M.",
""
],
[
"Tsou",
"S. T.",
""
]
] |
It is shown that if, from the starting point of a universal rank-one mass matrix long favoured by phenomenologists, one adds the assumption that it rotates (changes its orientation in generation space) with changing scale, one can reproduce, in terms of only 6 real parameters, all the 16 mass ratios and mixing parameters of quarks and leptons. Of these 16 quantities so reproduced, 10 for which data exist for direct comparison (i.e. the CKM elements including the CP-violating phase, the angles $\theta_{12}, \theta_{13}, \theta_{23}$ in $\nu$-oscillation, and the masses $m_c, m_\mu, m_e$) agree well with experiment, mostly to within experimental errors; 4 others ($m_s, m_u, m_d, m_{\nu_2}$), the experimental values for which can only be inferred, agree reasonably well; while 2 others ($m_{\nu_1}, \delta_{CP}$ for leptons), not yet measured experimentally, remain as predictions. In addition, one gets as bonuses, estimates for (i) the right-handed neutrino mass $m_{\nu_R}$ and (ii) the strong CP angle $\theta$ inherent in QCD. One notes in particular that the output value for $\sin^2 2 \theta_{13}$ from the fit agrees very well with recent experiments. By inputting the current experimental value with its error, one obtains further from the fit 2 new testable constraints: (i) that $\theta_{23}$ must depart from its "maximal" value: $\sin^2 2 \theta_{23} \sim 0.935 \pm 0.021$, (ii) that the CP-violating (Dirac) phase in the PMNS would be smaller than in the CKM matrix: of order only $|\sin \delta_{CP}| \leq 0.31$ if not vanishing altogether.
|
2103.15837
|
Ziyu Dong
|
Zi-Yu Dong, Teng Ma and Jing Shu
|
Constructing on-shell operator basis for all masses and spins
|
12 pages
|
Phys.Rev.D 107 (2023) 11, L111901
|
10.1103/PhysRevD.107.L111901
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We first propose a general method to construct the complete set of on-shell
operator bases involving massive particles with any spins. To incorporate the
non-abelian little groups of massive particles, the on-shell scattering
amplitude basis should be factorized into two parts: one is charged, and the
other one is neutral under little groups of massive particles. The complete set
of these two parts can be systematically constructed by choosing some specific
Young diagrams of Lorentz subgroup and global symmetry $U(N)$ respectively ($N$
is the number of external particles), without the equation of motion and
integration by part redundancy. Thus the complete massive amplitude bases
without any redundancies can be obtained by combining these two complete sets.
Some examples are presented to explicitly demonstrate this method. This method
is applicable for constructing amplitude bases involving identical particles,
and all the bases can be constructed automatically by computer programs based
on it.
|
[
{
"created": "Mon, 29 Mar 2021 18:00:03 GMT",
"version": "v1"
}
] |
2024-06-07
|
[
[
"Dong",
"Zi-Yu",
""
],
[
"Ma",
"Teng",
""
],
[
"Shu",
"Jing",
""
]
] |
We first propose a general method to construct the complete set of on-shell operator bases involving massive particles with any spins. To incorporate the non-abelian little groups of massive particles, the on-shell scattering amplitude basis should be factorized into two parts: one is charged, and the other one is neutral under little groups of massive particles. The complete set of these two parts can be systematically constructed by choosing some specific Young diagrams of Lorentz subgroup and global symmetry $U(N)$ respectively ($N$ is the number of external particles), without the equation of motion and integration by part redundancy. Thus the complete massive amplitude bases without any redundancies can be obtained by combining these two complete sets. Some examples are presented to explicitly demonstrate this method. This method is applicable for constructing amplitude bases involving identical particles, and all the bases can be constructed automatically by computer programs based on it.
|
0804.0863
|
Scott Watson
|
Bobby S. Acharya, Piyush Kumar, Konstantin Bobkov, Gordon Kane, Jing
Shao, and Scott Watson
|
Non-thermal Dark Matter and the Moduli Problem in String Frameworks
|
41 pages, 5 figures, references and minor comments added
|
JHEP 0806:064,2008
|
10.1088/1126-6708/2008/06/064
| null |
hep-ph astro-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We address the cosmological moduli/gravitino problems and the issue of too
little thermal but excessive non-thermal dark matter from the decays of moduli.
The main examples we study are the G2-MSSM models arising from M theory
compactifications, which allow for a precise calculation of moduli decay rates
and widths. We find that the late decaying moduli satisfy both BBN constraints
and avoid the gravitino problem. The non-thermal production of wino LSPs, which
is a prediction of G2-MSSM models, gives a relic density of about the right
order of magnitude.
|
[
{
"created": "Mon, 7 Apr 2008 16:20:30 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Apr 2008 04:54:17 GMT",
"version": "v2"
}
] |
2009-02-09
|
[
[
"Acharya",
"Bobby S.",
""
],
[
"Kumar",
"Piyush",
""
],
[
"Bobkov",
"Konstantin",
""
],
[
"Kane",
"Gordon",
""
],
[
"Shao",
"Jing",
""
],
[
"Watson",
"Scott",
""
]
] |
We address the cosmological moduli/gravitino problems and the issue of too little thermal but excessive non-thermal dark matter from the decays of moduli. The main examples we study are the G2-MSSM models arising from M theory compactifications, which allow for a precise calculation of moduli decay rates and widths. We find that the late decaying moduli satisfy both BBN constraints and avoid the gravitino problem. The non-thermal production of wino LSPs, which is a prediction of G2-MSSM models, gives a relic density of about the right order of magnitude.
|
hep-ph/9807402
|
Rohini Godbole
|
R.M. Godbole
|
Resolved Photon Processes
|
16 pages, LaTeX, 7 figures, requires epsfig.sty. Plenary talk
presented at Workshop on High Energy Physics Phenomenology, V, January 12-25,
1998, Pune, India
|
Pramana 51 (1998) 217-228
|
10.1007/BF02827493
|
IISc-CTS/7/98
|
hep-ph
| null |
After giving a very brief introduction to the resolved photon processes, I
will summarise the latest experimental information from HERA, on resolved
photon contribution to large pt jet production as well as to direct photon
production. I will point out the interesting role that resolved photon
processes can play in increasing our understanding of the dynamics of the
Quarkonium production. I will then discuss the newer information on the parton
content of virtual photons as well as the kt distribution of the partons in the
photon. I will end by giving predictions of an eikonalised minijet model for
siggg which crucially uses the experimental measurement of the abovementioned
kt distribution and comparing them with data.
|
[
{
"created": "Fri, 17 Jul 1998 10:41:05 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Godbole",
"R. M.",
""
]
] |
After giving a very brief introduction to the resolved photon processes, I will summarise the latest experimental information from HERA, on resolved photon contribution to large pt jet production as well as to direct photon production. I will point out the interesting role that resolved photon processes can play in increasing our understanding of the dynamics of the Quarkonium production. I will then discuss the newer information on the parton content of virtual photons as well as the kt distribution of the partons in the photon. I will end by giving predictions of an eikonalised minijet model for siggg which crucially uses the experimental measurement of the abovementioned kt distribution and comparing them with data.
|
1907.05921
|
Anton Motornenko
|
Anton Motornenko, Jan Steinheimer, Volodymyr Vovchenko, Stefan
Schramm, and Horst Stoecker
|
Matter And Gravitation In Collisions of heavy ions and neutron stars:
equation of state
|
16 pages, 10 figures; contribution to the proceedings of the CPOD2018
conference, Corfu Island, Greece, September 24-28, 2018
| null | null | null |
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The gravitational waves emitted from a binary neutron star merger, as
predicted from general relativistic magneto-hydrodynamics calculations, are
sensitive to the appearance of quark matter and the stiffness of the equation
of state of QCD matter present in the inner cores of the stars. This is a new
messenger observable from outer space, which does provide direct signals for
the phase structure of strongly interacting QCD matter at high baryon density
and high temperature. These astrophysically created extremes of thermodynamics
do match, to within 20\%, the values of densities and temperatures which we
find in relativistic hydrodynamics and transport theory of heavy ion collisions
at the existing laboratories, if though at quite different rapidity windows,
impact parameters and bombarding energies of the heavy nuclear systems. We
demonstrate how one unified equation of state can be constructed and used for
both neutron star physics and hot QCD matter excited at laboratory facilities.
The similarity in underlying QCD physics allows the gravitational wave signals
from future advanced LIGO and Virgo events to be combined with the analysis of
high multiplicity fluctuations and flow measurements in heavy ion detectors in
the lab to pin down the EoS and the phase structure of dense matter.
|
[
{
"created": "Fri, 12 Jul 2019 18:55:09 GMT",
"version": "v1"
}
] |
2019-07-16
|
[
[
"Motornenko",
"Anton",
""
],
[
"Steinheimer",
"Jan",
""
],
[
"Vovchenko",
"Volodymyr",
""
],
[
"Schramm",
"Stefan",
""
],
[
"Stoecker",
"Horst",
""
]
] |
The gravitational waves emitted from a binary neutron star merger, as predicted from general relativistic magneto-hydrodynamics calculations, are sensitive to the appearance of quark matter and the stiffness of the equation of state of QCD matter present in the inner cores of the stars. This is a new messenger observable from outer space, which does provide direct signals for the phase structure of strongly interacting QCD matter at high baryon density and high temperature. These astrophysically created extremes of thermodynamics do match, to within 20\%, the values of densities and temperatures which we find in relativistic hydrodynamics and transport theory of heavy ion collisions at the existing laboratories, if though at quite different rapidity windows, impact parameters and bombarding energies of the heavy nuclear systems. We demonstrate how one unified equation of state can be constructed and used for both neutron star physics and hot QCD matter excited at laboratory facilities. The similarity in underlying QCD physics allows the gravitational wave signals from future advanced LIGO and Virgo events to be combined with the analysis of high multiplicity fluctuations and flow measurements in heavy ion detectors in the lab to pin down the EoS and the phase structure of dense matter.
|
2306.16523
|
Jochem Kip
|
Wim Beenakker, Sascha Caron, Jochem Kip, Roberto Ruiz de Austri,
Zhongyi Zhang
|
New energy spectra in neutrino and photon detectors to reveal hidden
dark matter signals
|
7 pages, 2 figures
|
Journal of High Energy Physics 2023 (2023) 28
|
10.1007/JHEP11(2023)028
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Neutral particles capable of travelling cosmic distances from a source to
detectors on Earth are limited to photons and neutrinos. Examination of the
Dark Matter annihilation/decay spectra for these particles reveals the presence
of continuum spectra (e.g. due to fragmentation and W or Z decay) and peaks
(due to direct annihilations/decays). However, when one explores extensions of
the Standard Model (BSM), unexplored spectra emerge that differ significantly
from those of the Standard Model (SM) for both neutrinos and photons. In this
paper, we argue for the inclusion of important spectra that include peaks as
well as previously largely unexplored entities such as boxes and combinations
of box, peak and continuum decay spectra.
|
[
{
"created": "Wed, 28 Jun 2023 19:38:34 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2023 12:04:53 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Oct 2023 13:14:40 GMT",
"version": "v3"
}
] |
2023-11-21
|
[
[
"Beenakker",
"Wim",
""
],
[
"Caron",
"Sascha",
""
],
[
"Kip",
"Jochem",
""
],
[
"de Austri",
"Roberto Ruiz",
""
],
[
"Zhang",
"Zhongyi",
""
]
] |
Neutral particles capable of travelling cosmic distances from a source to detectors on Earth are limited to photons and neutrinos. Examination of the Dark Matter annihilation/decay spectra for these particles reveals the presence of continuum spectra (e.g. due to fragmentation and W or Z decay) and peaks (due to direct annihilations/decays). However, when one explores extensions of the Standard Model (BSM), unexplored spectra emerge that differ significantly from those of the Standard Model (SM) for both neutrinos and photons. In this paper, we argue for the inclusion of important spectra that include peaks as well as previously largely unexplored entities such as boxes and combinations of box, peak and continuum decay spectra.
|
hep-ph/0108117
|
Seong-Youl Choi
|
S.Y. Choi (Chonbuk National University), J. Kalinowski (Warsaw
University), G. Moortgat-Pick (DESY) and P.M. Zerwas (DESY)
|
Analysis of the Neutralino System in Supersymmetric Theories
|
36 pages, Latex file and 9 eps figures
|
Eur.Phys.J.C22:563-579,2001; Addendum-ibid.C23:769-772,2002
|
10.1007/s100520100808
| null |
hep-ph hep-ex hep-th
| null |
Charginos $\tilde{\chi}^\pm$ and neutralinos $\tilde{\chi}^0$ in
supersymmetric theories can be produced copiously at $e^+e^-$ colliders and
their properties can be measured with high accuracy. Consecutively to the
chargino system, in which the SU(2) gaugino parameter $M_2$, the higgsino mass
parameter $\mu$ and $\tan\beta$ can be determined, the remaining fundamental
supersymmetry parameter in the gaugino/higgsino sector of the minimal
supersymmetric extension of the Standard Model, the U(1) gaugino mass $M_1$,
can be analyzed in the neutralino system, including its modulus and its phase
in CP-noninvariant theories. The CP properties of the neutralino system are
characterized by unitarity quadrangles. Analytical solutions for the neutralino
mass eigenvalues and for the mixing matrix are presented for CP-noninvariant
theories in general. They can be written in compact form for large
supersymmetric mass parameters. The closure of the neutralino and chargino
systems can be studied by exploiting sum rules for the pair-production
processes in $e^+e^-$ collisions. Thus the picture of the non-colored gaugino
and higgsino complex in supersymmetric theories can comprehensively be
reconstructed in these experiments.
|
[
{
"created": "Tue, 14 Aug 2001 13:08:46 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Choi",
"S. Y.",
"",
"Chonbuk National University"
],
[
"Kalinowski",
"J.",
"",
"Warsaw\n University"
],
[
"Moortgat-Pick",
"G.",
"",
"DESY"
],
[
"Zerwas",
"P. M.",
"",
"DESY"
]
] |
Charginos $\tilde{\chi}^\pm$ and neutralinos $\tilde{\chi}^0$ in supersymmetric theories can be produced copiously at $e^+e^-$ colliders and their properties can be measured with high accuracy. Consecutively to the chargino system, in which the SU(2) gaugino parameter $M_2$, the higgsino mass parameter $\mu$ and $\tan\beta$ can be determined, the remaining fundamental supersymmetry parameter in the gaugino/higgsino sector of the minimal supersymmetric extension of the Standard Model, the U(1) gaugino mass $M_1$, can be analyzed in the neutralino system, including its modulus and its phase in CP-noninvariant theories. The CP properties of the neutralino system are characterized by unitarity quadrangles. Analytical solutions for the neutralino mass eigenvalues and for the mixing matrix are presented for CP-noninvariant theories in general. They can be written in compact form for large supersymmetric mass parameters. The closure of the neutralino and chargino systems can be studied by exploiting sum rules for the pair-production processes in $e^+e^-$ collisions. Thus the picture of the non-colored gaugino and higgsino complex in supersymmetric theories can comprehensively be reconstructed in these experiments.
|
hep-ph/0210152
|
Rogerio Rosenfeld
|
A. H. Campos, H. C. Reis and R. Rosenfeld
|
Preheating in Quintessential Inflation
|
4 pages, 4 figures
|
Phys.Lett.B575:151-156,2003
|
10.1016/j.physletb.2003.09.064
| null |
hep-ph
| null |
We perform a numerical study of the preheating mechanism of particle
production in models of quintessential inflation and compare it with the usual
gravitational production mechanism. We find that even for a very small coupling
between the inflaton field and a massless scalar field, g > 10^{-9}, preheating
dominates over gravitational particle production. Reheating temperatures in the
range 10^{-2} GeV < T_{rh} < 10^{15} GeV can be easily obtained.
|
[
{
"created": "Wed, 9 Oct 2002 20:14:15 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Campos",
"A. H.",
""
],
[
"Reis",
"H. C.",
""
],
[
"Rosenfeld",
"R.",
""
]
] |
We perform a numerical study of the preheating mechanism of particle production in models of quintessential inflation and compare it with the usual gravitational production mechanism. We find that even for a very small coupling between the inflaton field and a massless scalar field, g > 10^{-9}, preheating dominates over gravitational particle production. Reheating temperatures in the range 10^{-2} GeV < T_{rh} < 10^{15} GeV can be easily obtained.
|
hep-ph/0105028
|
Jae Hyun Park
|
S. Baek, J.-H. Jang, P. Ko, J. H. Park
|
Gluino-squark contributions to CP violations in the kaon system
|
29 pages, 6 figures, 1 table; typos and references corrected; version
to appear in NPB
|
Nucl.Phys.B609:442-468,2001
|
10.1016/S0550-3213(01)00312-1
|
KAIST-TH 2001/06
|
hep-ph
| null |
Recently it was shown, within the mass insertion approximation (MIA), that
the gluino mediated flavor changing neutral current (FCNC) interactions can
saturate both epsilon_K and Re(epsilon'/epsilon_K) even for the real
Cabibbo-Kobayashi-Maskawa (CKM) matrix through a single CP violating parameter
(delta^d_12)_LL. In this work, we extend our previous analysis to the
nonvanishing KM phase, and to the effective SUSY model where the MIA is no
longer a good approximation. In our model, epsilon_K and B0 - B0 bar mixing can
receive significant SUSY contributions. Therefore the usual constraints on rho
and eta in the Wolfenstein parametrization of the CKM matrix can be relaxed
except for the |V_ub/V_cb| from the semileptonic b -> u transition. This
affects K -> pi nu nu bar and K_L -> mu+ mu- indirectly, even if they are not
directly induced by gluino-mediated FCNC, while K_L -> pi0 e+ e- is influenced
both directly and indirectly. Differences between our model and other SUSY
models enhancing Re(epsilon'/epsilon_K) are discussed in detail.
|
[
{
"created": "Thu, 3 May 2001 13:23:31 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jul 2001 11:56:01 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Baek",
"S.",
""
],
[
"Jang",
"J. -H.",
""
],
[
"Ko",
"P.",
""
],
[
"Park",
"J. H.",
""
]
] |
Recently it was shown, within the mass insertion approximation (MIA), that the gluino mediated flavor changing neutral current (FCNC) interactions can saturate both epsilon_K and Re(epsilon'/epsilon_K) even for the real Cabibbo-Kobayashi-Maskawa (CKM) matrix through a single CP violating parameter (delta^d_12)_LL. In this work, we extend our previous analysis to the nonvanishing KM phase, and to the effective SUSY model where the MIA is no longer a good approximation. In our model, epsilon_K and B0 - B0 bar mixing can receive significant SUSY contributions. Therefore the usual constraints on rho and eta in the Wolfenstein parametrization of the CKM matrix can be relaxed except for the |V_ub/V_cb| from the semileptonic b -> u transition. This affects K -> pi nu nu bar and K_L -> mu+ mu- indirectly, even if they are not directly induced by gluino-mediated FCNC, while K_L -> pi0 e+ e- is influenced both directly and indirectly. Differences between our model and other SUSY models enhancing Re(epsilon'/epsilon_K) are discussed in detail.
|
2011.05993
|
Manuel A. Buen-Abad
|
Manuel A. Buen-Abad, JiJi Fan, Chen Sun
|
Constraints on Axions from Cosmic Distance Measurements
|
Version accepted for publication. 21 pages + appendix and references;
5 figures
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Axion couplings to photons could induce photon-axion conversion in the
presence of magnetic fields in the Universe. This conversion could impact
various cosmic distance measurements, such as luminosity distances to type Ia
supernovae and angular distances to galaxy clusters, in different ways. In this
paper we consider different combinations of the most up-to-date distance
measurements to constrain the axion-photon coupling. Employing the conservative
cell magnetic field model for the magnetic fields in the intergalactic medium
(IGM) and ignoring the conversion in the intracluster medium (ICM), we find the
upper bounds on axion-photon couplings to be around $5 \times 10^{-12}$
(nG/$B$) $\sqrt{\mathrm{Mpc/s}}$ GeV$^{-1}$ for axion masses $m_a$ below
$10^{-13}$ eV, where $B$ is the strength of the IGM magnetic field, and $s$ is
the comoving size of the magnetic domains. When including the conversion in the
ICM, the upper bound is lowered and could reach $5 \times 10^{-13}\,
$GeV$^{-1}$ for $m_a < 5 \times 10^{-12}$ eV. While this stronger bound depends
on the ICM modeling, it is independent of the strength of the IGM magnetic
field, for which there is no direct evidence yet. These constraints could be
placed on firmer footing with an enhanced understanding and control of the
astrophysical uncertainties associated with the IGM and ICM. All the bounds are
determined by the shape of the Hubble rate as a function of redshift
reconstructable from various distance measurements, and insensitive to today's
Hubble rate, of which there is a tension between early and late cosmological
measurements. As an appendix, we discuss the model building challenges of the
use of photon-axion conversion to make type Ia supernovae brighter to alleviate
the Hubble problem/crisis.
|
[
{
"created": "Wed, 11 Nov 2020 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Dec 2020 15:40:10 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2022 17:21:10 GMT",
"version": "v3"
}
] |
2022-02-16
|
[
[
"Buen-Abad",
"Manuel A.",
""
],
[
"Fan",
"JiJi",
""
],
[
"Sun",
"Chen",
""
]
] |
Axion couplings to photons could induce photon-axion conversion in the presence of magnetic fields in the Universe. This conversion could impact various cosmic distance measurements, such as luminosity distances to type Ia supernovae and angular distances to galaxy clusters, in different ways. In this paper we consider different combinations of the most up-to-date distance measurements to constrain the axion-photon coupling. Employing the conservative cell magnetic field model for the magnetic fields in the intergalactic medium (IGM) and ignoring the conversion in the intracluster medium (ICM), we find the upper bounds on axion-photon couplings to be around $5 \times 10^{-12}$ (nG/$B$) $\sqrt{\mathrm{Mpc/s}}$ GeV$^{-1}$ for axion masses $m_a$ below $10^{-13}$ eV, where $B$ is the strength of the IGM magnetic field, and $s$ is the comoving size of the magnetic domains. When including the conversion in the ICM, the upper bound is lowered and could reach $5 \times 10^{-13}\, $GeV$^{-1}$ for $m_a < 5 \times 10^{-12}$ eV. While this stronger bound depends on the ICM modeling, it is independent of the strength of the IGM magnetic field, for which there is no direct evidence yet. These constraints could be placed on firmer footing with an enhanced understanding and control of the astrophysical uncertainties associated with the IGM and ICM. All the bounds are determined by the shape of the Hubble rate as a function of redshift reconstructable from various distance measurements, and insensitive to today's Hubble rate, of which there is a tension between early and late cosmological measurements. As an appendix, we discuss the model building challenges of the use of photon-axion conversion to make type Ia supernovae brighter to alleviate the Hubble problem/crisis.
|
hep-ph/9603343
|
Rogerio Rosenfeld
|
S.M. Lietti, S.F. Novaes and R. Rosenfeld (IFT)
|
Anomalous Higgs Boson Contribution to e^+ e^- \to b \bbar \gamma at LEP2
|
12 pages, RevTex, 4 figures included
|
Phys.Rev. D54 (1996) 3266-3270
|
10.1103/PhysRevD.54.3266
|
IFT--P.008/96
|
hep-ph
| null |
We study the effect of anomalous $H\gamma\gamma$ and $HZ\gamma$ couplings,
described by a general effective Lagrangian, on the process $e^+ e^- \to b
\bar{b} \gamma $ at LEP2 energies. We include the relevant irreducible standard
model background to this process, and from the photon energy spectrum, we
determine the reach of LEP2 to unravel the anomalous couplings by analyzing the
significance of the signal for Higgs boson with mass up to $150$ GeV.
|
[
{
"created": "Tue, 19 Mar 1996 15:18:53 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Lietti",
"S. M.",
"",
"IFT"
],
[
"Novaes",
"S. F.",
"",
"IFT"
],
[
"Rosenfeld",
"R.",
"",
"IFT"
]
] |
We study the effect of anomalous $H\gamma\gamma$ and $HZ\gamma$ couplings, described by a general effective Lagrangian, on the process $e^+ e^- \to b \bar{b} \gamma $ at LEP2 energies. We include the relevant irreducible standard model background to this process, and from the photon energy spectrum, we determine the reach of LEP2 to unravel the anomalous couplings by analyzing the significance of the signal for Higgs boson with mass up to $150$ GeV.
|
1008.1279
|
Don Colladay
|
Don Colladay and Patrick McDonald
|
Lorentz Violation and Extended Supersymmetry
|
Presented at the Fifth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 28-July 2, 2010
| null |
10.1142/9789814327688_0046
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct a collection of Lorentz violating Yang-Mills theories exhibiting
supersymmetry.
|
[
{
"created": "Fri, 6 Aug 2010 21:32:43 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Colladay",
"Don",
""
],
[
"McDonald",
"Patrick",
""
]
] |
We construct a collection of Lorentz violating Yang-Mills theories exhibiting supersymmetry.
|
2107.04216
|
Sandra Robles
|
Nicole F. Bell, Matthew J. Dolan, Sandra Robles
|
Searching for Dark Matter in the Sun using Hyper-Kamiokande
|
23 pages, 11 figures, 2 tables. Discussion extended, references
added, matches published version
|
JCAP 11 (2021) 004
|
10.1088/1475-7516/2021/11/004
| null |
hep-ph astro-ph.CO astro-ph.SR hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the ability of the Hyper-Kamiokande (HyperK) experiment, currently
under construction, to constrain a neutrino signal produced via the
annihilation of dark matter captured in the Sun. We simulate upward stopping
and upward through-going muon events at HyperK, using Super-Kamiokande (SuperK)
atmospheric neutrino results for validation, together with fully and partially
contained events. Considering the annihilation of dark matter to various
standard model final states, we determined the HyperK sensitivity to the dark
matter spin-dependent scattering cross-section. We find that HyperK will
improve upon current SuperK limits by a factor of 2-3, with a further
improvement in sensitivity possible if systematic errors can be decreased
relative to SuperK.
|
[
{
"created": "Fri, 9 Jul 2021 05:33:41 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2021 11:36:06 GMT",
"version": "v2"
}
] |
2021-11-08
|
[
[
"Bell",
"Nicole F.",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"Robles",
"Sandra",
""
]
] |
We study the ability of the Hyper-Kamiokande (HyperK) experiment, currently under construction, to constrain a neutrino signal produced via the annihilation of dark matter captured in the Sun. We simulate upward stopping and upward through-going muon events at HyperK, using Super-Kamiokande (SuperK) atmospheric neutrino results for validation, together with fully and partially contained events. Considering the annihilation of dark matter to various standard model final states, we determined the HyperK sensitivity to the dark matter spin-dependent scattering cross-section. We find that HyperK will improve upon current SuperK limits by a factor of 2-3, with a further improvement in sensitivity possible if systematic errors can be decreased relative to SuperK.
|
hep-ph/0611365
|
Azad Inshalla Ahmedov
|
A.I.Ahmadov (1 and 2), I.Boztosun (3), A.Soylu (3), and E.A.Dadashov
(2), ((1) Physikalisches Institut, Universitat Bonn, Germany; (2) Institute
for Physical Problems, Baku State University, Azerbaijan; (3) Department of
Physics, Faculty of Arts and Sciences, Erciyes University, Kayseri, Turkey)
|
Higher Twist Effects in Photon-Photon Collisions
|
REVTEX4, 23 pages, 7 figures
|
Int.J.Mod.Phys.E17:1041-1059,2008
|
10.1142/S0218301308010325
| null |
hep-ph
| null |
In this article, we investigate the contribution of the high twist Feynman
diagrams to the large $p_{T}$ single pseudoscalar and vector mesons inclusive
production cross section in two-photon collisions and we present the general
formulae for the high and leading twist differential cross sections. The pion
wave function where two non-trivial Gegenbauer coefficients $a_2$ and $a_4$
have been extracted from the CLEO data, Braun-Filyanov pion wave function, the
asymptotic and the Chernyak-Zhitnitsky wave functions are used in the
calculations. For $\rho$-meson we used Ball-Braun wave function. The results of
all the calculations reveal that the high twist cross sections, the ratio R,
the dependence transverse momentum $p_{T}$ and the rapidity $y$ of meson in
$\Phi_{CLEO}(x,Q^2)$ wave function case is very close to the $\Phi_{asy}(x)$
asymptotic wave function case. It is shown that the high twist contribution to
the cross section depends on the choice of the meson wave functions.
|
[
{
"created": "Wed, 29 Nov 2006 09:52:27 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Ahmadov",
"A. I.",
"",
"1 and 2"
],
[
"Boztosun",
"I.",
""
],
[
"Soylu",
"A.",
""
],
[
"Dadashov",
"E. A.",
""
]
] |
In this article, we investigate the contribution of the high twist Feynman diagrams to the large $p_{T}$ single pseudoscalar and vector mesons inclusive production cross section in two-photon collisions and we present the general formulae for the high and leading twist differential cross sections. The pion wave function where two non-trivial Gegenbauer coefficients $a_2$ and $a_4$ have been extracted from the CLEO data, Braun-Filyanov pion wave function, the asymptotic and the Chernyak-Zhitnitsky wave functions are used in the calculations. For $\rho$-meson we used Ball-Braun wave function. The results of all the calculations reveal that the high twist cross sections, the ratio R, the dependence transverse momentum $p_{T}$ and the rapidity $y$ of meson in $\Phi_{CLEO}(x,Q^2)$ wave function case is very close to the $\Phi_{asy}(x)$ asymptotic wave function case. It is shown that the high twist contribution to the cross section depends on the choice of the meson wave functions.
|
2107.05271
|
Hua-Xing Chen
|
Hua-Xing Chen, Wei Chen and Shi-Lin Zhu
|
Two- and three-gluon glueballs of $C=+$
|
10 pages, 4 figures, 2 tables, revised version to be published in
PRD. arXiv admin note: text overlap with arXiv:2103.17201
|
Phys. Rev. D 104, 094050 (2021)
|
10.1103/PhysRevD.104.094050
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
We study two- and three-gluon glueballs of $C=+$ using the method of QCD sum
rules. We systematically construct their interpolating currents, and find that
all the spin-1 currents of $C=+$ vanish. This suggests that the
``ground-state'' spin-1 glueballs of $C=+$ do not exist within the relativistic
framework. We calculate masses of the two-gluon glueballs with $J^{PC} =
0^{\pm+}/2^{\pm+}$ and the three-gluon glueballs with $J^{PC} =
0^{\pm+}/2^{\pm+}$. We propose to search for the $J^{PC} =
0^{-+}/2^{-\pm}/3^{\pm-}$ three-gluon glueballs in their three-meson decay
channels in future BESIII, GlueX, LHC, and PANDA experiments.
|
[
{
"created": "Mon, 12 Jul 2021 09:08:46 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Nov 2021 04:06:49 GMT",
"version": "v2"
}
] |
2022-03-07
|
[
[
"Chen",
"Hua-Xing",
""
],
[
"Chen",
"Wei",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We study two- and three-gluon glueballs of $C=+$ using the method of QCD sum rules. We systematically construct their interpolating currents, and find that all the spin-1 currents of $C=+$ vanish. This suggests that the ``ground-state'' spin-1 glueballs of $C=+$ do not exist within the relativistic framework. We calculate masses of the two-gluon glueballs with $J^{PC} = 0^{\pm+}/2^{\pm+}$ and the three-gluon glueballs with $J^{PC} = 0^{\pm+}/2^{\pm+}$. We propose to search for the $J^{PC} = 0^{-+}/2^{-\pm}/3^{\pm-}$ three-gluon glueballs in their three-meson decay channels in future BESIII, GlueX, LHC, and PANDA experiments.
|
hep-ph/9806405
|
Lisa L. Everett
|
Lisa Everett (Penn U.)
|
Three-Family Perturbative String Vacua: Flat Directions and Effective
Couplings
|
4 pp., Talk given at the 6th International Symposium on Particles,
Strings, and Cosmology (PASCOS 98), Boston, MA, March 1998
| null | null |
UPR-0812-T
|
hep-ph
| null |
The properties of a class of quasi-realistic three-family perturbative
heterotic string vacua are addressed. String models in this class generically
contain an anomalous U(1), such that the nonzero Fayet-Iliopoulos term triggers
certain fields to acquire string scale VEV's along flat directions. This vacuum
shift reduces the rank of the gauge group and generates effective mass terms
and effective trilinear interactions. Techniques are discussed which yield a
systematic classification of the flat directions of a given string model which
can be proven to be F- flat to all orders. The effective superpotential along
such flat directions can then be calculated to all orders in the string (genus)
expansion.
|
[
{
"created": "Thu, 18 Jun 1998 13:54:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Everett",
"Lisa",
"",
"Penn U."
]
] |
The properties of a class of quasi-realistic three-family perturbative heterotic string vacua are addressed. String models in this class generically contain an anomalous U(1), such that the nonzero Fayet-Iliopoulos term triggers certain fields to acquire string scale VEV's along flat directions. This vacuum shift reduces the rank of the gauge group and generates effective mass terms and effective trilinear interactions. Techniques are discussed which yield a systematic classification of the flat directions of a given string model which can be proven to be F- flat to all orders. The effective superpotential along such flat directions can then be calculated to all orders in the string (genus) expansion.
|
hep-ph/0107086
|
Arnd Brandenburg
|
W. Bernreuther, A. Brandenburg, Z.G. Si, P. Uwer
|
Top quark spin correlations at hadron colliders: Predictions at
next-to-leading order QCD
|
9 pages, 2 figures
|
Phys.Rev.Lett. 87 (2001) 242002
|
10.1103/PhysRevLett.87.242002
|
DESY 01-085, PITHA 01/06, TTP01-16
|
hep-ph
| null |
The collider experiments at the Tevatron and the LHC will allow for detailed
investigations of the properties of the top quark. This requires precise
predictions of the hadronic production of $t\bar t$ pairs and of their
subsequent decays. In this Letter we present for the reactions $p {\bar p}, p p
\to t{\bar t} + X \to \ell^+\ell'^-X$ the first calculation of the dilepton
angular distribution at next-to-leading order (NLO) in the QCD coupling,
keeping the full dependence on the spins of the intermediate $t\bar{t}$ state.
The angular distribution reflects the degree of correlation of the $t$ and
$\bar t$ spins which we determine for different choices of $t$ and $\bar t$
spin bases. In the case of the Tevatron, the QCD corrections are sizeable, and
the distribution is quite sensitive to the parton content of the proton.
|
[
{
"created": "Mon, 9 Jul 2001 16:53:49 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Bernreuther",
"W.",
""
],
[
"Brandenburg",
"A.",
""
],
[
"Si",
"Z. G.",
""
],
[
"Uwer",
"P.",
""
]
] |
The collider experiments at the Tevatron and the LHC will allow for detailed investigations of the properties of the top quark. This requires precise predictions of the hadronic production of $t\bar t$ pairs and of their subsequent decays. In this Letter we present for the reactions $p {\bar p}, p p \to t{\bar t} + X \to \ell^+\ell'^-X$ the first calculation of the dilepton angular distribution at next-to-leading order (NLO) in the QCD coupling, keeping the full dependence on the spins of the intermediate $t\bar{t}$ state. The angular distribution reflects the degree of correlation of the $t$ and $\bar t$ spins which we determine for different choices of $t$ and $\bar t$ spin bases. In the case of the Tevatron, the QCD corrections are sizeable, and the distribution is quite sensitive to the parton content of the proton.
|
hep-ph/0404065
|
Hee-Jung Lee
|
N.I. Kochelev, H.-J. Lee, V. Vento
|
Instanton induced quark dynamics and the pentaquark
|
14 pages, 2 figures; added references, corrected typos
|
Phys.Lett. B594 (2004) 87-96
|
10.1016/j.physletb.2004.05.011
|
FTUV-04-0407, IFIC-04-27
|
hep-ph
| null |
We analyze the existence of the exotic $\Theta^+$ from the perspective of
instanton induced quark dynamics. The 't Hooft interaction gives strong
attraction in specific channels of the triquark $ud\bar s$ and diquark $ud$
configurations. In particular it leads to a light $ud\bar s$ triquark cluster,
with the mass around $750 {\rm MeV}$, in the I=0, $S=1/2$ and color 3
configuration, and a light $ud$-diquark configuration, with mass $440 {\rm
MeV}$, in the I=0, S=0 and color {$\bar{3}$} configuration. If we consider the
pentaquark as a bound state of such triquark and diquark configurations in a
relative L=1 state we obtain good agreement with the data. The small width of
$\Theta^+$ has a natural explanation in this model.
|
[
{
"created": "Wed, 7 Apr 2004 17:05:36 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Apr 2004 10:09:06 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Kochelev",
"N. I.",
""
],
[
"Lee",
"H. -J.",
""
],
[
"Vento",
"V.",
""
]
] |
We analyze the existence of the exotic $\Theta^+$ from the perspective of instanton induced quark dynamics. The 't Hooft interaction gives strong attraction in specific channels of the triquark $ud\bar s$ and diquark $ud$ configurations. In particular it leads to a light $ud\bar s$ triquark cluster, with the mass around $750 {\rm MeV}$, in the I=0, $S=1/2$ and color 3 configuration, and a light $ud$-diquark configuration, with mass $440 {\rm MeV}$, in the I=0, S=0 and color {$\bar{3}$} configuration. If we consider the pentaquark as a bound state of such triquark and diquark configurations in a relative L=1 state we obtain good agreement with the data. The small width of $\Theta^+$ has a natural explanation in this model.
|
2110.09876
|
Stefano Gariazzo
|
Stefano Gariazzo
|
Light Sterile Neutrinos
|
8 pages. Proceedings for the "17th International Conference on Topics
in Astroparticle and Underground Physics (TAUP)"
| null |
10.1088/1742-6596/2156/1/012003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the status of light sterile neutrino searches, motivated by the
original Short BaseLine (SBL) anomalies. Here, we discuss how sterile neutrino
properties can be constrained by different types of neutrino oscillation
experiments (considering appearance or disappearance probes in different
oscillation channels) and non-oscillation measurements. These latter include
experiments aiming at obtaining a value for the absolute scale of neutrino
masses ($\beta$ decay probes) and the indirect constraints that we could obtain
from cosmological observations.
|
[
{
"created": "Tue, 19 Oct 2021 11:52:27 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Oct 2021 08:44:09 GMT",
"version": "v2"
}
] |
2022-03-02
|
[
[
"Gariazzo",
"Stefano",
""
]
] |
We review the status of light sterile neutrino searches, motivated by the original Short BaseLine (SBL) anomalies. Here, we discuss how sterile neutrino properties can be constrained by different types of neutrino oscillation experiments (considering appearance or disappearance probes in different oscillation channels) and non-oscillation measurements. These latter include experiments aiming at obtaining a value for the absolute scale of neutrino masses ($\beta$ decay probes) and the indirect constraints that we could obtain from cosmological observations.
|
2111.06065
|
Aqeel Ahmed
|
Aqeel Ahmed, Bohdan Grzadkowski, Anna Socha
|
Implications of time-dependent inflaton decay on reheating and dark
matter production
|
v2: 8 pages and 2 figures; improved discussion on inflaton-induced
gravitational production of dark matter; matches the published version
| null |
10.1016/j.physletb.2022.137201
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss the production of radiation and dark matter assuming a
time-dependent inflaton decay rate during the reheating period. It is shown
that the time dependence of the inflaton decay rate can substantially modify
the reheating dynamics. As an illustration, a leading interaction between the
inflaton $\phi$ and the Higgs doublet ${\boldsymbol h}$ of the form $\phi
|{\boldsymbol h}|^2$ was adopted. In the presence of such interaction, the
Higgs doublet acquires a $\phi$-dependent mass which generates
vacuum-expectation-value due to inflaton oscillations and breaks the Standard
Model gauge symmetry. This leads to a time-dependent inflaton decay rate during
the reheating period, and consequently, the production of radiation and dark
matter during this period is modified. Regions of the parameter space that
describe the observed value of the dark matter abundance were found and
compared with the standard case when inflaton the decay rate is constant.
|
[
{
"created": "Thu, 11 Nov 2021 06:07:52 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2022 06:18:10 GMT",
"version": "v2"
}
] |
2022-07-29
|
[
[
"Ahmed",
"Aqeel",
""
],
[
"Grzadkowski",
"Bohdan",
""
],
[
"Socha",
"Anna",
""
]
] |
We discuss the production of radiation and dark matter assuming a time-dependent inflaton decay rate during the reheating period. It is shown that the time dependence of the inflaton decay rate can substantially modify the reheating dynamics. As an illustration, a leading interaction between the inflaton $\phi$ and the Higgs doublet ${\boldsymbol h}$ of the form $\phi |{\boldsymbol h}|^2$ was adopted. In the presence of such interaction, the Higgs doublet acquires a $\phi$-dependent mass which generates vacuum-expectation-value due to inflaton oscillations and breaks the Standard Model gauge symmetry. This leads to a time-dependent inflaton decay rate during the reheating period, and consequently, the production of radiation and dark matter during this period is modified. Regions of the parameter space that describe the observed value of the dark matter abundance were found and compared with the standard case when inflaton the decay rate is constant.
|
0903.2562
|
Shao-Long Chen
|
Shao-Long Chen, Rabindra N. Mohapatra, Shmuel Nussinov and Yue Zhang
|
R-Parity Breaking via Type II Seesaw, Decaying Gravitino Dark Matter and
PAMELA Positron Excess
|
13 pages, 6 figures; accepted for publication in PLB
|
Phys.Lett.B677:311-317,2009
|
10.1016/j.physletb.2009.05.051
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new class of R-parity violating extension of MSSM with type II
seesaw mechanism for neutrino masses where an unstable gravitino is the dark
matter of the Universe. It decays predominantly into three leptons final
states, thereby providing a natural explanation of the positron excess but no
antiproton excess in the PAMELA experiment. The model can explain neutrino
masses without invoking any high scale physics while keeping the pre-existing
baryon asymmetry of the universe in tact.
|
[
{
"created": "Sat, 14 Mar 2009 17:46:04 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2009 00:54:40 GMT",
"version": "v2"
},
{
"created": "Thu, 21 May 2009 01:22:15 GMT",
"version": "v3"
}
] |
2014-11-18
|
[
[
"Chen",
"Shao-Long",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Nussinov",
"Shmuel",
""
],
[
"Zhang",
"Yue",
""
]
] |
We propose a new class of R-parity violating extension of MSSM with type II seesaw mechanism for neutrino masses where an unstable gravitino is the dark matter of the Universe. It decays predominantly into three leptons final states, thereby providing a natural explanation of the positron excess but no antiproton excess in the PAMELA experiment. The model can explain neutrino masses without invoking any high scale physics while keeping the pre-existing baryon asymmetry of the universe in tact.
|
1008.1404
|
Wolfgang Lucha
|
Wolfgang Lucha
|
Bethe-Salpeter Equations with Instantaneous Confinement: Establishing
Stability of Bound States
|
6 pages, contributed to QCD@Work 2010 - International Workshop on
Quantum Chromodynamics: Theory and Experiment (20 - 23 June 2010, Martina
Franca, Valle d'Itria, Italy), to appear in the proceedings
|
AIP Conf.Proc.1317:122-127,2011
|
10.1063/1.3536544
|
HEPHY-PUB 885/10
|
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Salpeter equations with potential functions rising to infinity in
configuration space do not automatically predict stable bound states. For this
to happen, also the Lorentz behaviour of the involved Bethe-Salpeter kernels is
crucial. At least for interaction potentials of harmonic-oscillator form
analytic scrutinies of Salpeter equations with confining interactions may
identify those Bethe-Salpeter kernels which describe bound states free from the
notorious instabilities encountered in numerical evaluations. Such truly
confining kernels can be singled out systematically by requesting the resulting
bound-state energy spectra to be both real and discrete.
|
[
{
"created": "Sun, 8 Aug 2010 13:18:38 GMT",
"version": "v1"
}
] |
2011-02-01
|
[
[
"Lucha",
"Wolfgang",
""
]
] |
Salpeter equations with potential functions rising to infinity in configuration space do not automatically predict stable bound states. For this to happen, also the Lorentz behaviour of the involved Bethe-Salpeter kernels is crucial. At least for interaction potentials of harmonic-oscillator form analytic scrutinies of Salpeter equations with confining interactions may identify those Bethe-Salpeter kernels which describe bound states free from the notorious instabilities encountered in numerical evaluations. Such truly confining kernels can be singled out systematically by requesting the resulting bound-state energy spectra to be both real and discrete.
|
1409.0750
|
Vo Quoc Phong
|
Vo Quoc Phong, Hoang Ngoc Long, Vo Thanh Van, Le Hoang Minh
|
Electroweak phase transition in the economical 3-3-1 model
|
17 pages, 9 figures
|
Eur. Phys. J. C (2015) 75:342
|
10.1140/epjc/s10052-015-3550-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the EWPT in the economical 3-3-1 (E331) model. Our analysis shows
that the EWPT in the model is a sequence of two first-order phase transitions,
$SU(3) \rightarrow SU(2)$ at the TeV scale and $SU(2) \rightarrow U(1)$ at the
$100$ GeV scale. The EWPT $SU(3) \rightarrow SU(2)$ is triggered by the new
bosons and the exotic quarks; its strength is about $1 - 13$ if the mass ranges
of these new particles are $10^2 \,\mathrm{GeV} - 10^3 \,\mathrm{GeV}$. The
EWPT $SU(2) \rightarrow U(1)$ is strengthened by only the new bosons; its
strength is about $1 - 1.15$ if the mass parts of $H^0_1$, $H^\pm_2$ and
$Y^\pm$ are in the ranges $10 \,\mathrm{GeV} - 10^2 \,\mathrm{GeV}$. The
contributions of $H^0_1$ and $H^{\pm}_2$ to the strengths of both EWPTs may
make them sufficiently strong to provide large deviations from thermal
equilibrium and B violation necessary for baryogenesis.
|
[
{
"created": "Tue, 2 Sep 2014 15:20:16 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2014 16:33:42 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Nov 2014 16:00:30 GMT",
"version": "v3"
},
{
"created": "Wed, 8 Apr 2015 05:05:16 GMT",
"version": "v4"
},
{
"created": "Fri, 24 Jul 2015 07:28:41 GMT",
"version": "v5"
}
] |
2015-07-27
|
[
[
"Phong",
"Vo Quoc",
""
],
[
"Long",
"Hoang Ngoc",
""
],
[
"Van",
"Vo Thanh",
""
],
[
"Minh",
"Le Hoang",
""
]
] |
We consider the EWPT in the economical 3-3-1 (E331) model. Our analysis shows that the EWPT in the model is a sequence of two first-order phase transitions, $SU(3) \rightarrow SU(2)$ at the TeV scale and $SU(2) \rightarrow U(1)$ at the $100$ GeV scale. The EWPT $SU(3) \rightarrow SU(2)$ is triggered by the new bosons and the exotic quarks; its strength is about $1 - 13$ if the mass ranges of these new particles are $10^2 \,\mathrm{GeV} - 10^3 \,\mathrm{GeV}$. The EWPT $SU(2) \rightarrow U(1)$ is strengthened by only the new bosons; its strength is about $1 - 1.15$ if the mass parts of $H^0_1$, $H^\pm_2$ and $Y^\pm$ are in the ranges $10 \,\mathrm{GeV} - 10^2 \,\mathrm{GeV}$. The contributions of $H^0_1$ and $H^{\pm}_2$ to the strengths of both EWPTs may make them sufficiently strong to provide large deviations from thermal equilibrium and B violation necessary for baryogenesis.
|
1110.2378
|
Berndt Muller
|
Berndt M\"uller and Andreas Sch\"afer
|
Entropy Creation in Relativistic Heavy Ion Collisions
|
34 pages, 14 figures
| null |
10.1142/S0218301311020459
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review current ideas on entropy production during the different stages of
a relativistic nuclear collision. This includes recent results on decoherence
entropy and the entropy produced during the hydrodynamic phase by viscous
effects. We start by a discussion of decoherence caused by gluon bremsstrahlung
in the very first interactions of gluons from the colliding nuclei. We then
present a general framework, based on the Husimi distribution function, for the
calculation of entropy growth in quantum field theories, which is applicable to
the early ("glasma") phase of the collision during which most of the entropy is
generated. The entropy calculated from the Husimi distribution exhibits linear
growth when the quantum field contains unstable modes and the growth rateis
asymptotically equal to the Kolmogorov-Sina\"i (KS) entropy. We outline how the
approach can be used to investigate the problem of entropy production in a
relativistic heavy-ion reaction from first principles. Finally we discuss some
recent results on entropy production in the strong coupling limit, as obtained
from AdS/CFT duality.
|
[
{
"created": "Tue, 11 Oct 2011 13:52:19 GMT",
"version": "v1"
}
] |
2015-05-30
|
[
[
"Müller",
"Berndt",
""
],
[
"Schäfer",
"Andreas",
""
]
] |
We review current ideas on entropy production during the different stages of a relativistic nuclear collision. This includes recent results on decoherence entropy and the entropy produced during the hydrodynamic phase by viscous effects. We start by a discussion of decoherence caused by gluon bremsstrahlung in the very first interactions of gluons from the colliding nuclei. We then present a general framework, based on the Husimi distribution function, for the calculation of entropy growth in quantum field theories, which is applicable to the early ("glasma") phase of the collision during which most of the entropy is generated. The entropy calculated from the Husimi distribution exhibits linear growth when the quantum field contains unstable modes and the growth rateis asymptotically equal to the Kolmogorov-Sina\"i (KS) entropy. We outline how the approach can be used to investigate the problem of entropy production in a relativistic heavy-ion reaction from first principles. Finally we discuss some recent results on entropy production in the strong coupling limit, as obtained from AdS/CFT duality.
|
hep-ph/0005027
| null |
Howard Baer, Michal Brhlik, Marco A. Diaz, Javier Ferrandis, Pedro
Mercadante, Pam Quintana and Xerxes Tata
|
Yukawa Unified Supersymmetric SO(10) Model: Cosmology, Rare Decays and
Collider Searches
|
Added comparison to Blazek/Raby results and added Comments on de Boer
et al. b->s gamma results
|
Phys.Rev.D63:015007,2000
|
10.1103/PhysRevD.63.015007
|
FSU-HEP-000216, UCCHEP/12-00, IFIC/00-18, FTUV/000504, UH-511-963-00
|
hep-ph
| null |
It has recently been pointed out that viable sparticle mass spectra can be
generated in Yukawa unified SO(10) supersymmetric grand unified models
consistent with radiative breaking of electroweak symmetry. Model solutions are
obtained only if $\tan\beta \sim 50$, $\mu <0$ and positive $D$-term
contributions to scalar masses from SO(10) gauge symmetry breaking are used. In
this paper, we attempt to systematize the parameter space regions where
solutions are obtained. We go on to calculate the relic density of neutralinos
as a function of parameter space. No regions of the parameter space explored
were actually cosmologically excluded, and very reasonable relic densities were
found in much of parameter space. Direct neutralino detection rates could
exceed 1 event/kg/day for a $^{73}$Ge detector, for low values of GUT scale
gaugino mass $m_{1/2}$. We also calculate the branching fraction for $b\to s
\gamma$ decays, and find that it is beyond the 95% CL experimental limits in
much, but not all, of the parameter space regions explored. However, recent
claims have been made that NLO effects can reverse the signs of certain
amplitudes in the $b\to s\gamma$ calculation, leading to agreement between
theory and experiment in Yukawa unified SUSY models. For the Fermilab Tevatron
collider, significant regions of parameter space can be explored via
$b\bar{b}A$ and $b\bar{b}H$ searches. There also exist some limited regions of
parameter space where a trilepton signal can be seen at TeV33. Finally, there
exist significant regions of parameter space where direct detection of bottom
squark pair production can be made, especially for large negative values of the
GUT parameter $A_0$.
|
[
{
"created": "Wed, 3 May 2000 19:52:27 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 2000 20:07:12 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Baer",
"Howard",
""
],
[
"Brhlik",
"Michal",
""
],
[
"Diaz",
"Marco A.",
""
],
[
"Ferrandis",
"Javier",
""
],
[
"Mercadante",
"Pedro",
""
],
[
"Quintana",
"Pam",
""
],
[
"Tata",
"Xerxes",
""
]
] |
It has recently been pointed out that viable sparticle mass spectra can be generated in Yukawa unified SO(10) supersymmetric grand unified models consistent with radiative breaking of electroweak symmetry. Model solutions are obtained only if $\tan\beta \sim 50$, $\mu <0$ and positive $D$-term contributions to scalar masses from SO(10) gauge symmetry breaking are used. In this paper, we attempt to systematize the parameter space regions where solutions are obtained. We go on to calculate the relic density of neutralinos as a function of parameter space. No regions of the parameter space explored were actually cosmologically excluded, and very reasonable relic densities were found in much of parameter space. Direct neutralino detection rates could exceed 1 event/kg/day for a $^{73}$Ge detector, for low values of GUT scale gaugino mass $m_{1/2}$. We also calculate the branching fraction for $b\to s \gamma$ decays, and find that it is beyond the 95% CL experimental limits in much, but not all, of the parameter space regions explored. However, recent claims have been made that NLO effects can reverse the signs of certain amplitudes in the $b\to s\gamma$ calculation, leading to agreement between theory and experiment in Yukawa unified SUSY models. For the Fermilab Tevatron collider, significant regions of parameter space can be explored via $b\bar{b}A$ and $b\bar{b}H$ searches. There also exist some limited regions of parameter space where a trilepton signal can be seen at TeV33. Finally, there exist significant regions of parameter space where direct detection of bottom squark pair production can be made, especially for large negative values of the GUT parameter $A_0$.
|
hep-ph/0702035
|
Philippe Crochet
|
G.Martinez-Garcia, S.Gadrat and P.Crochet
|
A new contribution to the nuclear modification factor of non-photonic
electrons in Au+Au collisions at sqrt(s) = 200 GeV
|
14 pages, 3 figures
| null | null | null |
hep-ph nucl-ex
| null |
We investigate the effect of the so-called anomalous baryon/meson enhancement
to the nuclear modification factor of non-photonic electrons in Au+Au
collisions at sqrt(s) = 200 GeV. It is demonstrated that an enhancement of the
charm baryon/meson ratio, as it is observed for non-strange and strange
hadrons, can be responsible for part of the amplitude of the nuclear
modification factor of non-photonic electrons. About half of the measured
suppression of non-photonic electrons in the 2-4 pt range can be explained by a
charm baryon/meson enhancement of 5. This contribution to the non-photonic
electron nuclear modification factor has nothing to do with heavy quark energy
loss.
|
[
{
"created": "Fri, 2 Feb 2007 17:37:29 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2007 18:47:14 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Martinez-Garcia",
"G.",
""
],
[
"Gadrat",
"S.",
""
],
[
"Crochet",
"P.",
""
]
] |
We investigate the effect of the so-called anomalous baryon/meson enhancement to the nuclear modification factor of non-photonic electrons in Au+Au collisions at sqrt(s) = 200 GeV. It is demonstrated that an enhancement of the charm baryon/meson ratio, as it is observed for non-strange and strange hadrons, can be responsible for part of the amplitude of the nuclear modification factor of non-photonic electrons. About half of the measured suppression of non-photonic electrons in the 2-4 pt range can be explained by a charm baryon/meson enhancement of 5. This contribution to the non-photonic electron nuclear modification factor has nothing to do with heavy quark energy loss.
|
hep-ph/9608412
|
Wieslaw Placzek
|
S. Jadach (1 and 2), W. Placzek (3), B. F. L. Ward (3 and 4 and 2)
((1) Institute of Nuclear Physics, Cracow, Poland, (2) CERN, Theory Division,
Geneva, Switzerland, (3) The University of Tennessee, Knoxville, Tennessee,
USA, (4) SLAC, Stanford University, Stanford, California, USA)
|
BHWIDE 1.00: O(alpha) YFS Exponentiated Monte Carlo for Bhabha
Scattering at Wide Angles for LEP1/SLC and LEP2
|
LaTeX, 14 pages, 3 Postscript figures, References in a .bbl file,
Submitted to Physics Letters
|
Phys.Lett. B390 (1997) 298-308
|
10.1016/S0370-2693(96)01382-2
|
UTHEP-95-1001
|
hep-ph
| null |
We present O(alpha) YFS exponentiated results for wide angle Bhabha
scattering at LEP/SLC energies using a new Monte Carlo event generator BHWIDE
1.xx. Our calculations include two options for the pure weak corrections, as
presented in Beenakker et al. and in Bohm et al. From comparison with the
results of Beenakker et al., Montagna et al. and Cacciari et al., we conclude
that the total precision of our BHWIDE results is 0.3% (0.5%) in the LEP1/SLC
regime within +-100 MeV (+2.75/-2.5 GeV) of the Z peak. For LEP2, the
corresponding precision is currently estimated at 1.5%; the latter could be
improved if the data in LEP2 so require. Both precision tags represent clear
improvements over what is currently available in the literature.
|
[
{
"created": "Thu, 22 Aug 1996 20:11:40 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Jadach",
"S.",
"",
"1 and 2"
],
[
"Placzek",
"W.",
"",
"3 and 4 and 2"
],
[
"Ward",
"B. F. L.",
"",
"3 and 4 and 2"
]
] |
We present O(alpha) YFS exponentiated results for wide angle Bhabha scattering at LEP/SLC energies using a new Monte Carlo event generator BHWIDE 1.xx. Our calculations include two options for the pure weak corrections, as presented in Beenakker et al. and in Bohm et al. From comparison with the results of Beenakker et al., Montagna et al. and Cacciari et al., we conclude that the total precision of our BHWIDE results is 0.3% (0.5%) in the LEP1/SLC regime within +-100 MeV (+2.75/-2.5 GeV) of the Z peak. For LEP2, the corresponding precision is currently estimated at 1.5%; the latter could be improved if the data in LEP2 so require. Both precision tags represent clear improvements over what is currently available in the literature.
|
hep-ph/9703262
|
Nils A. Tornqvist
|
Nils A. Tornqvist (University of Helsinki)
|
Gluons as Goldstone Bosons when Flavor Symmetry is Broken Spontaneously
|
10 pages, RevTeX, 2 Figures
| null | null | null |
hep-ph nucl-th
| null |
The mechanism where flavor symmetry is broken spontaneously is discussed
within a scalar QCD model with effective three-meson couplings. For
sufficiently large coupling the model is unstable with respect to quantum loops
from mesonic vacuum polarization. It is argued that color and gluons naturally
can account for the Goldstone degrees of freedom expected when flavor symmetry
is spontaneously broken.
|
[
{
"created": "Fri, 7 Mar 1997 09:34:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Tornqvist",
"Nils A.",
"",
"University of Helsinki"
]
] |
The mechanism where flavor symmetry is broken spontaneously is discussed within a scalar QCD model with effective three-meson couplings. For sufficiently large coupling the model is unstable with respect to quantum loops from mesonic vacuum polarization. It is argued that color and gluons naturally can account for the Goldstone degrees of freedom expected when flavor symmetry is spontaneously broken.
|
1505.00917
|
Bernard Pire
|
B. Pire, L. Szymanowski
|
Neutrino-production of a charmed meson and the transverse spin structure
of the nucleon
|
5 pages, 1 figure. Version 2 adds a few clarifications and
references. As published in Physical Review Letters 115, 092001 (2015)
|
Phys. Rev. Lett. 115, 092001 (2015)
|
10.1103/PhysRevLett.115.092001
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the amplitude for exclusive neutrino production of a charmed
meson on an unpolarized target, in the colinear QCD approach where generalized
parton distributions (GPDs) factorize from perturbatively calculable
coefficient functions. We demonstrate that the transversity chiral odd GPDs
contribute to the transverse cross section if the hard amplitude is calculated
up to order mc/Q. We show how to access these GPDs through the azimuthal
dependence of the nu N -> mu D N differential cross section.
|
[
{
"created": "Tue, 5 May 2015 08:41:35 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2015 10:06:19 GMT",
"version": "v2"
}
] |
2015-09-02
|
[
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
]
] |
We calculate the amplitude for exclusive neutrino production of a charmed meson on an unpolarized target, in the colinear QCD approach where generalized parton distributions (GPDs) factorize from perturbatively calculable coefficient functions. We demonstrate that the transversity chiral odd GPDs contribute to the transverse cross section if the hard amplitude is calculated up to order mc/Q. We show how to access these GPDs through the azimuthal dependence of the nu N -> mu D N differential cross section.
|
hep-ph/9909383
|
Ester Ruiz Morales
|
E. Ruiz Morales, M. E. Peskin
|
Probing Strong Electroweak Symmetry Breaking in W+ W- -> t \bar t
|
6 pages, LaTeX + 1 eps figure, one reference added, to appear in the
Proceedings of the International Workshop on Linear Colliders, Sitges,
Barcelona, Spain, 28 April - 5 May, 1999
| null | null |
FTUAM-99-23, SLAC-PUB-8251
|
hep-ph
| null |
We study the process $W^+ W^- \to t \bar t$ in several models of strong
interaction electroweak symmetry breaking. We calculate the signals that can be
expected by observing the reaction $e^+ e^- \to \nu \bar\nu t \bar t$ at an
$e^+ e^-$ linear collider with 1.5 TeV center of mass energy. We also discuss
how the lowest-lying resonances predicted by these models could be identified
using top polarization observables.
|
[
{
"created": "Wed, 15 Sep 1999 15:41:41 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 1999 09:33:26 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Morales",
"E. Ruiz",
""
],
[
"Peskin",
"M. E.",
""
]
] |
We study the process $W^+ W^- \to t \bar t$ in several models of strong interaction electroweak symmetry breaking. We calculate the signals that can be expected by observing the reaction $e^+ e^- \to \nu \bar\nu t \bar t$ at an $e^+ e^-$ linear collider with 1.5 TeV center of mass energy. We also discuss how the lowest-lying resonances predicted by these models could be identified using top polarization observables.
|
1402.1181
|
Miguel Nebot
|
F. J. Botella, G. C. Branco, M. Nebot, A. Sanchez
|
Mixing asymmetries in B meson systems, the D0 like-sign dimuon asymmetry
and generic New Physics
|
17 pages, 10 figures, 1 table. Improved sections 2 and 3, updated
results, conclusions unchanged
|
Phys. Rev. D 91, 035013 (2015)
|
10.1103/PhysRevD.91.035013
|
IFIC/14-04,CFTP/14-005
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The measurement of a large like-sign dimuon asymmetry $A^b_{SL}$ by the D0
experiment at the Tevatron departs noticeably from Standard Model expectations
and it may be interpreted as a hint of physics beyond the Standard Model
contributing to $\Delta B\neq 0$ transitions. In this work we analyse how the
natural suppression of $A^b_{SL}$ in the SM can be circumvented by New Physics.
We consider generic Standard Model extensions where the charged current mixing
matrix is enlarged with respect to the usual $3\times 3$ unitary
Cabibbo-Kobayashi-Maskawa matrix, and show how, within this framework, a
significant enhancement over Standard Model expectations for $A^b_{SL}$ is
easily reachable through enhancements of the semileptonic asymmetries
$A^d_{SL}$ and $A^s_{SL}$ of both $B^0_d$ - $\bar B^0_d$ and $B^0_s$ - $\bar
B^0_s$ systems. Despite being insufficient to reproduce the D0 measurement,
such deviations from SM expectations may be probed by the LHCb experiment.
|
[
{
"created": "Wed, 5 Feb 2014 21:10:27 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2014 19:21:32 GMT",
"version": "v2"
}
] |
2015-03-05
|
[
[
"Botella",
"F. J.",
""
],
[
"Branco",
"G. C.",
""
],
[
"Nebot",
"M.",
""
],
[
"Sanchez",
"A.",
""
]
] |
The measurement of a large like-sign dimuon asymmetry $A^b_{SL}$ by the D0 experiment at the Tevatron departs noticeably from Standard Model expectations and it may be interpreted as a hint of physics beyond the Standard Model contributing to $\Delta B\neq 0$ transitions. In this work we analyse how the natural suppression of $A^b_{SL}$ in the SM can be circumvented by New Physics. We consider generic Standard Model extensions where the charged current mixing matrix is enlarged with respect to the usual $3\times 3$ unitary Cabibbo-Kobayashi-Maskawa matrix, and show how, within this framework, a significant enhancement over Standard Model expectations for $A^b_{SL}$ is easily reachable through enhancements of the semileptonic asymmetries $A^d_{SL}$ and $A^s_{SL}$ of both $B^0_d$ - $\bar B^0_d$ and $B^0_s$ - $\bar B^0_s$ systems. Despite being insufficient to reproduce the D0 measurement, such deviations from SM expectations may be probed by the LHCb experiment.
|
hep-ph/9602434
|
Roberto Fiore
|
R. Fiore, L.L. Jenkovszky, F. Paccanoni
|
Non-Linear Pomeron Trajectory in Diffractive Deep Inelastic Scattering
|
16 pages, Latex + 3 figures, postscript
|
Phys.Rev.D54:6651-6657,1996
|
10.1103/PhysRevD.54.6651
|
DFPD 96/TH 11 - CS-TH 2/96
|
hep-ph
| null |
Recent experimental data on diffractive deep inelastic scattering collected
by the H1 and ZEUS Collaborations at HERA are analysed in a model with a
non-linear trajectory in the pomeron flux. The $t$ dependence of the
diffractive structure function $F_2^{D(4)}$ is predicted. The normalization of
the pomeron flux and the (weak) $Q^2$ dependence of the pomeron structure
function are revised as well.
|
[
{
"created": "Thu, 29 Feb 1996 16:31:01 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Fiore",
"R.",
""
],
[
"Jenkovszky",
"L. L.",
""
],
[
"Paccanoni",
"F.",
""
]
] |
Recent experimental data on diffractive deep inelastic scattering collected by the H1 and ZEUS Collaborations at HERA are analysed in a model with a non-linear trajectory in the pomeron flux. The $t$ dependence of the diffractive structure function $F_2^{D(4)}$ is predicted. The normalization of the pomeron flux and the (weak) $Q^2$ dependence of the pomeron structure function are revised as well.
|
1711.04288
|
Kazem Azizi
|
K. Azizi, J. Y. Sungu
|
On the mass and decay constant of the P-wave ground and radially excited
$h_{c}$ and $h_{b}$ axial-vector mesons
|
10 Pages, 4 Figures and 4 Tables
| null | null | null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The mass and decay constant of the heavy quarkonia $h_{Q}(1P)$ and
$h_{Q}(2P)$ (Q = b, c) with quantum numbers $J^{PC} =1^{+-}$ are calculated in
the framework of the two-point QCD sum rule method by taking into account the
vacuum condensates up to eight dimensions. We compare our results for
parameters of the $h_{b}(1P)$ and $h_{c}(1P)$ quarkonia, and their first
radially excited states $h_{b}(2P)$ and $h_{c}(2P)$ with available experimental
data as well as predictions of other theoretical studies existing in the
literature. The results of present work may shed light on experimental searches
for the $h_{c}(2P)$ state.
|
[
{
"created": "Sun, 12 Nov 2017 13:09:21 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2018 07:15:29 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Jan 2019 08:44:35 GMT",
"version": "v3"
}
] |
2019-01-30
|
[
[
"Azizi",
"K.",
""
],
[
"Sungu",
"J. Y.",
""
]
] |
The mass and decay constant of the heavy quarkonia $h_{Q}(1P)$ and $h_{Q}(2P)$ (Q = b, c) with quantum numbers $J^{PC} =1^{+-}$ are calculated in the framework of the two-point QCD sum rule method by taking into account the vacuum condensates up to eight dimensions. We compare our results for parameters of the $h_{b}(1P)$ and $h_{c}(1P)$ quarkonia, and their first radially excited states $h_{b}(2P)$ and $h_{c}(2P)$ with available experimental data as well as predictions of other theoretical studies existing in the literature. The results of present work may shed light on experimental searches for the $h_{c}(2P)$ state.
|
hep-ph/9402334
|
Alex Pomarol
|
Alex Pomarol
|
Top Radiative Corrections in Non-minimal Standard Models
|
9 pages, phyzzx file, UPR-0603T. (a new reference has been added)
|
Phys.Rev. D50 (1994) 7085
|
10.1103/PhysRevD.50.7085
| null |
hep-ph
| null |
We derive the one-loop effective action induced by a heavy top in models with
an extended Higgs sector. We use the effective action to analyze the top
corrections to the $\rho$ parameter and to the Higgs-gauge boson couplings. We
show that in models with $\rho\not=1$ at tree-level, one does not lose
generally the bound on $m_t$ from the $\rho$ parameter.
|
[
{
"created": "Mon, 21 Feb 1994 23:51:47 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 1994 20:12:47 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Pomarol",
"Alex",
""
]
] |
We derive the one-loop effective action induced by a heavy top in models with an extended Higgs sector. We use the effective action to analyze the top corrections to the $\rho$ parameter and to the Higgs-gauge boson couplings. We show that in models with $\rho\not=1$ at tree-level, one does not lose generally the bound on $m_t$ from the $\rho$ parameter.
|
1106.0687
|
Patrick Huber
|
Patrick Huber
|
On the determination of anti-neutrino spectra from nuclear reactors
|
20 pages, 5 figures, 9 tables, added references, version accepted for
publication in Phys. Rev. C. Corrected errors in tab. 1 and eqs. 18 and 19.
Results and conclusion unchanged
|
Phys.Rev.C84:024617,2011
|
10.1103/PhysRevC.84.024617
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we study the effect of, well-known, higher order corrections to
the allowed beta decay spectrum on the determination of anti-neutrino spectra
resulting from the decays of fission fragments. In particular, we try to
estimate the associated theory errors and find that induced currents like weak
magnetism may ultimately limit our ability to improve the current accuracy and
under certain circumstance could even largely increase the theoretical errors.
We also perform a critical evaluation of the errors associated with our method
to extract the anti-neutrino spectrum using synthetic beta spectra. It turns
out, that a fit using only virtual beta branches with a judicious choice of the
effective nuclear charge provides results with a minimal bias. We apply this
method to actual data for U235, Pu239 and Pu241 and confirm, within errors,
recent results, which indicate a net 3% upward shift in energy averaged
anti-neutrino fluxes. However, we also find significant shape differences which
can in principle be tested by high statistics anti-neutrino data samples.
|
[
{
"created": "Fri, 3 Jun 2011 15:29:53 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2011 18:30:17 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Jul 2011 18:50:12 GMT",
"version": "v3"
},
{
"created": "Tue, 17 Jan 2012 21:06:44 GMT",
"version": "v4"
}
] |
2015-03-19
|
[
[
"Huber",
"Patrick",
""
]
] |
In this paper we study the effect of, well-known, higher order corrections to the allowed beta decay spectrum on the determination of anti-neutrino spectra resulting from the decays of fission fragments. In particular, we try to estimate the associated theory errors and find that induced currents like weak magnetism may ultimately limit our ability to improve the current accuracy and under certain circumstance could even largely increase the theoretical errors. We also perform a critical evaluation of the errors associated with our method to extract the anti-neutrino spectrum using synthetic beta spectra. It turns out, that a fit using only virtual beta branches with a judicious choice of the effective nuclear charge provides results with a minimal bias. We apply this method to actual data for U235, Pu239 and Pu241 and confirm, within errors, recent results, which indicate a net 3% upward shift in energy averaged anti-neutrino fluxes. However, we also find significant shape differences which can in principle be tested by high statistics anti-neutrino data samples.
|
1807.01709
|
Andrzej Buras
|
Jason Aebischer and Andrzej J. Buras and Jean-Marc Gerard
|
BSM Hadronic Matrix Elements for $\epsilon'/\epsilon$ and $K\to\pi\pi$
Decays in the Dual QCD Approach
|
39 pages, no figures, clarifying comments added, conclusions
unchanged, version to appear in JHEP
| null |
10.1007/JHEP02(2019)021
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate for the first time all four-quark hadronic matrix elements of
local operators possibly contributing to $K\to\pi\pi$ decays and in particular
to the ratio $\epsilon'/\epsilon$ beyond the Standard Model (BSM). To this end
we use the Dual QCD (DQCD) approach. In addition to 7 new mirror operators
obtained from the SM ones by flipping the chirality, we count 13 BSM four-quark
operators of a given chirality linearly independent of each other and of the
aforesaid 14 operators for which hadronic matrix elements are already known. We
present results in two bases for all these operators, one termed DQCD basis
useful for the calculation of the hadronic matrix elements in the DQCD approach
and the other called SD basis suited to the short distance renormalization
group evolution above the 1~GeV scale. We demonstrate that the pattern of long
distance evolution (meson evolution) matches the one of short distance
evolution (quark-gluon evolution), a property which to our knowledge cannot be
presently achieved in any other analytical framework. The highlights of our
paper are chirally enhanced matrix elements of tensor-tensor and scalar-scalar
BSM operators. They could thereby explain the emerging $\epsilon'/\epsilon$
anomaly which is strongly indicated within DQCD with some support from lattice
QCD. On the other hand we do not expect the BSM operators to be relevant for
the $\Delta I=1/2$ rule.
|
[
{
"created": "Wed, 4 Jul 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jul 2018 07:48:07 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Jan 2019 16:53:15 GMT",
"version": "v3"
}
] |
2019-02-20
|
[
[
"Aebischer",
"Jason",
""
],
[
"Buras",
"Andrzej J.",
""
],
[
"Gerard",
"Jean-Marc",
""
]
] |
We calculate for the first time all four-quark hadronic matrix elements of local operators possibly contributing to $K\to\pi\pi$ decays and in particular to the ratio $\epsilon'/\epsilon$ beyond the Standard Model (BSM). To this end we use the Dual QCD (DQCD) approach. In addition to 7 new mirror operators obtained from the SM ones by flipping the chirality, we count 13 BSM four-quark operators of a given chirality linearly independent of each other and of the aforesaid 14 operators for which hadronic matrix elements are already known. We present results in two bases for all these operators, one termed DQCD basis useful for the calculation of the hadronic matrix elements in the DQCD approach and the other called SD basis suited to the short distance renormalization group evolution above the 1~GeV scale. We demonstrate that the pattern of long distance evolution (meson evolution) matches the one of short distance evolution (quark-gluon evolution), a property which to our knowledge cannot be presently achieved in any other analytical framework. The highlights of our paper are chirally enhanced matrix elements of tensor-tensor and scalar-scalar BSM operators. They could thereby explain the emerging $\epsilon'/\epsilon$ anomaly which is strongly indicated within DQCD with some support from lattice QCD. On the other hand we do not expect the BSM operators to be relevant for the $\Delta I=1/2$ rule.
|
2004.06839
|
Paulo Beggio Cesar
|
P.C. Beggio and F.R. Coriolano
|
Energy dependence of the inelasticity in $pp/p\bar{p}$ collisions from
experimental information on charged particle multiplicity distributions
| null | null |
10.1140/epjc/s10052-020-7919-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dependence of the inelasticity in terms of the center of mass energy is
studied in the eikonal formalism, which provides connection between elastic and
inelastic channels. Due to the absence of inelasticity experimental datasets,
the present analysis is based on experimental information available on the full
phase space multiplicity distribution covering a large range of energy, namely
30 $<$ $\sqrt{s}$ $\leq$ 1800 GeV. Our results indicate that the decrease of
inelasticity is consequence of minijets production from semihard interactions
arising from the scattering of gluons carrying only a very small fractions of
the momenta from their parent protons. Alternative methods of estimating the
inelasticity are discussed and predictions to the LHC energies are presented.
|
[
{
"created": "Wed, 15 Apr 2020 00:24:22 GMT",
"version": "v1"
}
] |
2020-06-24
|
[
[
"Beggio",
"P. C.",
""
],
[
"Coriolano",
"F. R.",
""
]
] |
The dependence of the inelasticity in terms of the center of mass energy is studied in the eikonal formalism, which provides connection between elastic and inelastic channels. Due to the absence of inelasticity experimental datasets, the present analysis is based on experimental information available on the full phase space multiplicity distribution covering a large range of energy, namely 30 $<$ $\sqrt{s}$ $\leq$ 1800 GeV. Our results indicate that the decrease of inelasticity is consequence of minijets production from semihard interactions arising from the scattering of gluons carrying only a very small fractions of the momenta from their parent protons. Alternative methods of estimating the inelasticity are discussed and predictions to the LHC energies are presented.
|
0803.0131
|
Jurgen Berges
|
J. Berges, A. Rothkopf, J. Schmidt
|
Non-thermal fixed points: effective weak-coupling for strongly
correlated systems far from equilibrium
|
4 pages, 4 figures
|
Phys.Rev.Lett.101:041603,2008
|
10.1103/PhysRevLett.101.041603
|
TKYNT-08-02, DESY 08-020
|
hep-ph cond-mat.other hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Strongly correlated systems far from equilibrium can exhibit scaling
solutions with a dynamically generated weak coupling. We show this by
investigating isolated systems described by relativistic quantum field theories
for initial conditions leading to nonequilibrium instabilities, such as
parametric resonance or spinodal decomposition. The non-thermal fixed points
prevent fast thermalization if classical-statistical fluctuations dominate over
quantum fluctuations. We comment on the possible significance of these results
for the heating of the early universe after inflation and the question of fast
thermalization in heavy-ion collision experiments.
|
[
{
"created": "Mon, 3 Mar 2008 20:14:58 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Berges",
"J.",
""
],
[
"Rothkopf",
"A.",
""
],
[
"Schmidt",
"J.",
""
]
] |
Strongly correlated systems far from equilibrium can exhibit scaling solutions with a dynamically generated weak coupling. We show this by investigating isolated systems described by relativistic quantum field theories for initial conditions leading to nonequilibrium instabilities, such as parametric resonance or spinodal decomposition. The non-thermal fixed points prevent fast thermalization if classical-statistical fluctuations dominate over quantum fluctuations. We comment on the possible significance of these results for the heating of the early universe after inflation and the question of fast thermalization in heavy-ion collision experiments.
|
0902.2510
|
Kenji Kadota
|
Kenji Kadota, Keith A. Olive and Liliana Velasco-Sevilla
|
A Sneutrino NLSP in the $\nu$CMSSM
|
16 pages, 5 figures
|
Phys.Rev.D79:055018,2009
|
10.1103/PhysRevD.79.055018
|
MCTP-09-07, FTPI-MINN-09/07, UMN-TH-2737/09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the constrained minimal supersymmetric model (CMSSM) by adding a
right-handed neutrino superfield ($\nu$CMSSM) which decouples close to the GUT
scale. We study the effects of a right-handed neutrino on the low energy
spectrum and focus on the predictions for dark matter properties. We pay
particular attention to the realization of the light (left-handed) sneutrino
which can be the next-to-lightest supersymmetric particle (NLSP) with either
the neutralino or gravitino as the lightest supersymmetric particle (LSP).
Notably, for the case of a neutralino LSP with a sneutrino NLSP, there are new
`sneutrino coannihilation regions' which yield the desired thermal neutralino
relic density determined by WMAP.
|
[
{
"created": "Sun, 15 Feb 2009 01:45:54 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 2009 03:51:23 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Mar 2009 00:37:44 GMT",
"version": "v3"
}
] |
2010-04-21
|
[
[
"Kadota",
"Kenji",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Velasco-Sevilla",
"Liliana",
""
]
] |
We extend the constrained minimal supersymmetric model (CMSSM) by adding a right-handed neutrino superfield ($\nu$CMSSM) which decouples close to the GUT scale. We study the effects of a right-handed neutrino on the low energy spectrum and focus on the predictions for dark matter properties. We pay particular attention to the realization of the light (left-handed) sneutrino which can be the next-to-lightest supersymmetric particle (NLSP) with either the neutralino or gravitino as the lightest supersymmetric particle (LSP). Notably, for the case of a neutralino LSP with a sneutrino NLSP, there are new `sneutrino coannihilation regions' which yield the desired thermal neutralino relic density determined by WMAP.
|
2208.09090
|
Eligio Cruz-Albaro
|
E. Cruz-Albaro, A. Guti\'errez-Rodr\'iguez, J. I. Aranda and F.
Ram\'irez-Zavaleta
|
Research on the electromagnetic and weak dipole moments of the
tau-lepton at the Bestest Little Higgs Model
|
35 pages and 29 figures
| null |
10.1140/epjc/s10052-022-11076-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, using the Bestest Little Higgs Model (BLHM) we calculate at
the one-loop level the contributions to the Anomalous Magnetic Dipole Moment
(AMDM) and Anomalous Weak Magnetic Dipole Moment (AWMDM) of the tau-lepton. The
implications from this model are study, emphasizing the contributions of the
new physics induced by the new scalar and vector bosons of the BLHM: $S_i=H_0,
A_0, \phi^{0}, \eta^{0}, \sigma, H^{\pm}, \phi^{\pm}, \eta^{\pm}$, and $V_i=Z',
W'$, because these quantify the new physics. With these new contributions we
estimated bounds on both the real and imaginary parts of the AMDM and AWMDM of
the tau-lepton. Our study complements other one-loop level research performed
on models beyond the Standard Model.
|
[
{
"created": "Thu, 18 Aug 2022 23:32:49 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2022 14:21:52 GMT",
"version": "v2"
}
] |
2022-12-21
|
[
[
"Cruz-Albaro",
"E.",
""
],
[
"Gutiérrez-Rodríguez",
"A.",
""
],
[
"Aranda",
"J. I.",
""
],
[
"Ramírez-Zavaleta",
"F.",
""
]
] |
In this paper, using the Bestest Little Higgs Model (BLHM) we calculate at the one-loop level the contributions to the Anomalous Magnetic Dipole Moment (AMDM) and Anomalous Weak Magnetic Dipole Moment (AWMDM) of the tau-lepton. The implications from this model are study, emphasizing the contributions of the new physics induced by the new scalar and vector bosons of the BLHM: $S_i=H_0, A_0, \phi^{0}, \eta^{0}, \sigma, H^{\pm}, \phi^{\pm}, \eta^{\pm}$, and $V_i=Z', W'$, because these quantify the new physics. With these new contributions we estimated bounds on both the real and imaginary parts of the AMDM and AWMDM of the tau-lepton. Our study complements other one-loop level research performed on models beyond the Standard Model.
|
hep-ph/0510195
|
Karol Kolodziej
|
Karol Kolodziej, Adam Staron, Alejandro Lorca and Tord Riemann
|
Factorizable electroweak O(alpha) corrections for top quark pair
production and decay at a linear e+e- collider
|
16 pages, 3 figures; a comment on the corrections that were not
included in the paper and one reference added; accepted for publication in
Eur. Phys. J. C
|
Eur.Phys.J.C46:357-365,2006
|
10.1140/epjc/s2006-02477-x
|
DESY 05-199, SFB/CPP-05-68
|
hep-ph
| null |
We calculate the standard model predictions for top quark pair production and
decay into six fermions at a linear e+ e- collider. We include the factorizable
electroweak O(alpha) corrections in the pole approximation and QED corrections
due to the initial state radiation in the structure function approach. The
effects of the radiative corrections on the predictions are illustrated by
showing numerical results for two selected six-fermion reactions e+ e- -> b
nu_mu mu+ bar{b} mu- bar{nu_mu} and e+ e- -> b nu_mu mu+ bar{b} d bar{u}.
|
[
{
"created": "Fri, 14 Oct 2005 17:13:14 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jan 2006 12:26:22 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Kolodziej",
"Karol",
""
],
[
"Staron",
"Adam",
""
],
[
"Lorca",
"Alejandro",
""
],
[
"Riemann",
"Tord",
""
]
] |
We calculate the standard model predictions for top quark pair production and decay into six fermions at a linear e+ e- collider. We include the factorizable electroweak O(alpha) corrections in the pole approximation and QED corrections due to the initial state radiation in the structure function approach. The effects of the radiative corrections on the predictions are illustrated by showing numerical results for two selected six-fermion reactions e+ e- -> b nu_mu mu+ bar{b} mu- bar{nu_mu} and e+ e- -> b nu_mu mu+ bar{b} d bar{u}.
|
1902.03281
|
Petr Vogel
|
Petr Vogel
|
Reactor Neutrinos: Toward Oscillations
|
Invited Talk at the "History of the Neutrino" Conference, September
2018, Paris
| null | null | null |
hep-ph nucl-ex nucl-th physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I shall sketch the history of reactor neutrino physics over five decades
since the Reines-Cowan proof of neutrino existence in the late 50s, till the
advent of the present era of precision reactor neutrino oscillation
experiments. There are three chapters of this story: i) Exploration of
possibilities of the reactor neutrinos in the 60s and 70s; ii) Looking for
oscillations under the streetlamp in the 80s and 90s; iii) Exploring
oscillations in detail with known (almost) $\Delta m^2_{atm}$ and $\Delta
m^2_{sol}$.}
|
[
{
"created": "Fri, 8 Feb 2019 20:33:59 GMT",
"version": "v1"
}
] |
2019-02-13
|
[
[
"Vogel",
"Petr",
""
]
] |
I shall sketch the history of reactor neutrino physics over five decades since the Reines-Cowan proof of neutrino existence in the late 50s, till the advent of the present era of precision reactor neutrino oscillation experiments. There are three chapters of this story: i) Exploration of possibilities of the reactor neutrinos in the 60s and 70s; ii) Looking for oscillations under the streetlamp in the 80s and 90s; iii) Exploring oscillations in detail with known (almost) $\Delta m^2_{atm}$ and $\Delta m^2_{sol}$.}
|
hep-ph/9409415
| null |
D.Tadi\'c and S.\v{Z}ganec
|
Covariant and Heavy Quark Symmetric Quark Models
|
34 pages (2 figures not included but avaliable upon request), LATEX,
(to be published in Phys.Rev.D)
|
Phys.Rev.D50:5853-5864,1994
|
10.1103/PhysRevD.50.5853
|
ZTF-PMF/94
|
hep-ph
| null |
There exist relativistic quark models (potential or MIT-bag) which satisfy
the heavy quark symmetry (HQS) relations among meson decay constants and form
factors. Covariant construction of the momentum eigenstates, developed here,
can correct for spurious center-of-mass motion contributions.Proton form factor
and M1 transitions in quarkonia are calculated. Explicit expression for the
Isgur-Wise function is found and model determined deviations from HQS are
studied. All results depend on the model parameters only. No additional ad hoc
assumptions are needed.
|
[
{
"created": "Mon, 26 Sep 1994 15:05:23 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Tadić",
"D.",
""
],
[
"Žganec",
"S.",
""
]
] |
There exist relativistic quark models (potential or MIT-bag) which satisfy the heavy quark symmetry (HQS) relations among meson decay constants and form factors. Covariant construction of the momentum eigenstates, developed here, can correct for spurious center-of-mass motion contributions.Proton form factor and M1 transitions in quarkonia are calculated. Explicit expression for the Isgur-Wise function is found and model determined deviations from HQS are studied. All results depend on the model parameters only. No additional ad hoc assumptions are needed.
|
hep-ph/9504354
|
Hiroyuki Siomi
|
H. Shiomi and T. Hatsuda
|
The Pion-Nucleon Coupling Constant in QCD Sum Rules
|
15 pages, latex, 9 figures appended as uu-encoded file
|
Nucl.Phys. A594 (1995) 294-310
|
10.1016/0375-9474(95)00359-9
|
UTHEP-299
|
hep-ph nucl-th
| null |
The pion-nucleon coupling constant $g_{\pi N}$ is studied on the basis of the
QCD sum rules. Both the Borel sum rules and the finite energy sum rules for
$g_{\pi N}$ are used to examine the effects of higher dimensional operators (up
to dim. 7) and $\alpha_s$ corrections in the operator product expansion.
Agreement with the experimental number is reached only when $S_{\pi}/S_N$ is
greater than one, where $S_{\pi}$ ($S_N$) is the continuum threshold for the
$g_{\pi N}$ (nucleon) sum rule.
|
[
{
"created": "Fri, 21 Apr 1995 04:06:44 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Shiomi",
"H.",
""
],
[
"Hatsuda",
"T.",
""
]
] |
The pion-nucleon coupling constant $g_{\pi N}$ is studied on the basis of the QCD sum rules. Both the Borel sum rules and the finite energy sum rules for $g_{\pi N}$ are used to examine the effects of higher dimensional operators (up to dim. 7) and $\alpha_s$ corrections in the operator product expansion. Agreement with the experimental number is reached only when $S_{\pi}/S_N$ is greater than one, where $S_{\pi}$ ($S_N$) is the continuum threshold for the $g_{\pi N}$ (nucleon) sum rule.
|
2105.14624
|
Chris Korthals Altes
|
Chris P. Korthals Altes
|
Minimalistic musings about the Standard Model
|
submitted to Acta Physica Polonica. Some cosmetic changes and typos
corrected
| null |
10.5506/APhysPolB.52.607
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
\hspace{2,0cm}{{\bf A tribute to Martinus Veltman 1931-2021}}
Martinus ("Tini") Veltman 's early contributions to the Standard Model were
essential for its succes. After some nostalgic reminiscences, I turn to the
Standard Model with a minimalistic attitude, the point of view that beyond the
SM there is only the Planck scale. Known since long, the gravitational force
can be obtained as the gauge theory of local Poincar\'e symmetry, called gauge
gravity.
This gauge theory of gravity embodies {\it per se} a Palatini formulation.
This causes the potential of non-minimally coupled Higgs inflation to have an
intriguing improved large field behaviour. Some of its effects are
experimentally accessible or refutable. The question of quantum corrections is
discussed.
|
[
{
"created": "Sun, 30 May 2021 21:03:06 GMT",
"version": "v1"
}
] |
2021-07-07
|
[
[
"Altes",
"Chris P. Korthals",
""
]
] |
\hspace{2,0cm}{{\bf A tribute to Martinus Veltman 1931-2021}} Martinus ("Tini") Veltman 's early contributions to the Standard Model were essential for its succes. After some nostalgic reminiscences, I turn to the Standard Model with a minimalistic attitude, the point of view that beyond the SM there is only the Planck scale. Known since long, the gravitational force can be obtained as the gauge theory of local Poincar\'e symmetry, called gauge gravity. This gauge theory of gravity embodies {\it per se} a Palatini formulation. This causes the potential of non-minimally coupled Higgs inflation to have an intriguing improved large field behaviour. Some of its effects are experimentally accessible or refutable. The question of quantum corrections is discussed.
|
2103.05648
|
Anirban Biswas
|
Anirban Biswas, Debasish Borah, Dibyendu Nanda
|
Light Dirac neutrino portal dark matter with observable $\Delta{N_{\rm
eff}}$
|
39 pages, 7 figures, 1 table, a new discussion related to the decay
of $\phi$ has been added in Appendix A, new figures are added, new references
are added, conclusion remains unchanged, version accepted for publication in
JCAP
|
JCAP 10 (2021) 002
|
10.1088/1475-7516/2021/10/002
| null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We propose a Dirac neutrino portal dark matter scenario by minimally
extending the particle content of the Standard Model (SM) with three right
handed neutrinos ($\nu_R$), a Dirac fermion dark matter candidate ($\psi$) and
a complex scalar ($\phi$), all of which are singlets under the SM gauge group.
An additional $\mathbb{Z}_4$ symmetry has been introduced for the stability of
dark matter candidate $\psi$ and also ensuring the Dirac nature of light
neutrinos at the same time. Both the right handed neutrinos and the dark matter
thermalise with the SM plasma due to a new Yukawa interaction involving
$\nu_R$, $\psi$ and $\phi$ while the latter maintains thermal contact via the
Higgs portal interaction. The decoupling of $\nu_R$ occurs when $\phi$ loses
its kinetic equilibrium with the SM plasma and thereafter all three
$\mathbb{Z}_4$ charged particles form an equilibrium among themselves with a
temperature $T_{\nu_R}$. The dark matter candidate $\psi$ finally freezes out
within the dark sector and preserves its relic abundance. We have found that in
the present scenario, some portion of low mass dark matter
($M_{\psi}\lesssim10$ GeV) is already excluded by the Planck 2018 data for
keeping $\nu_R$s in the thermal bath below a temperature of 600 MeV and thereby
producing an excess contribution to $N_{\rm eff}$. The next generation
experiments like CMB-S4, SPT-3G etc. will have the required sensitivities to
probe the entire model parameter space of this minimal scenario, especially the
low mass range of $\psi$ where direct detection experiments are still not
capable enough for detection.
|
[
{
"created": "Tue, 9 Mar 2021 19:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 2021 14:47:10 GMT",
"version": "v2"
}
] |
2021-10-05
|
[
[
"Biswas",
"Anirban",
""
],
[
"Borah",
"Debasish",
""
],
[
"Nanda",
"Dibyendu",
""
]
] |
We propose a Dirac neutrino portal dark matter scenario by minimally extending the particle content of the Standard Model (SM) with three right handed neutrinos ($\nu_R$), a Dirac fermion dark matter candidate ($\psi$) and a complex scalar ($\phi$), all of which are singlets under the SM gauge group. An additional $\mathbb{Z}_4$ symmetry has been introduced for the stability of dark matter candidate $\psi$ and also ensuring the Dirac nature of light neutrinos at the same time. Both the right handed neutrinos and the dark matter thermalise with the SM plasma due to a new Yukawa interaction involving $\nu_R$, $\psi$ and $\phi$ while the latter maintains thermal contact via the Higgs portal interaction. The decoupling of $\nu_R$ occurs when $\phi$ loses its kinetic equilibrium with the SM plasma and thereafter all three $\mathbb{Z}_4$ charged particles form an equilibrium among themselves with a temperature $T_{\nu_R}$. The dark matter candidate $\psi$ finally freezes out within the dark sector and preserves its relic abundance. We have found that in the present scenario, some portion of low mass dark matter ($M_{\psi}\lesssim10$ GeV) is already excluded by the Planck 2018 data for keeping $\nu_R$s in the thermal bath below a temperature of 600 MeV and thereby producing an excess contribution to $N_{\rm eff}$. The next generation experiments like CMB-S4, SPT-3G etc. will have the required sensitivities to probe the entire model parameter space of this minimal scenario, especially the low mass range of $\psi$ where direct detection experiments are still not capable enough for detection.
|
0812.2731
|
Chia-Min Lin
|
Chia-Min Lin, Kingman Cheung
|
Super Hilltop Inflation
|
12 pages, 8 figures, to be published in JCAP
|
JCAP 0903:012,2009
|
10.1088/1475-7516/2009/03/012
| null |
hep-ph astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider logarithmic radiative corrections and higher order
terms to the supersymmetric hilltop F- and D-term hybrid inflation models.
Conventional F- and D-term hybrid inflation only predicts $n_s \gae 0.98$. We
show that via a positive quadratic and a negative quartic correction the
spectral index can be reduced to $n_s=0.96$ suggested from latest WMAP result
and also cosmic string problem appeared in SUSY hybrid inflation can be solved
with mild tuning of the parameters if $\kappa \lae 0.01$ for F-term inflation
and $g \lae 0.05$ for D-term inflation.
|
[
{
"created": "Mon, 15 Dec 2008 07:32:59 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2008 04:52:44 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Feb 2009 03:09:50 GMT",
"version": "v3"
}
] |
2010-04-23
|
[
[
"Lin",
"Chia-Min",
""
],
[
"Cheung",
"Kingman",
""
]
] |
In this paper, we consider logarithmic radiative corrections and higher order terms to the supersymmetric hilltop F- and D-term hybrid inflation models. Conventional F- and D-term hybrid inflation only predicts $n_s \gae 0.98$. We show that via a positive quadratic and a negative quartic correction the spectral index can be reduced to $n_s=0.96$ suggested from latest WMAP result and also cosmic string problem appeared in SUSY hybrid inflation can be solved with mild tuning of the parameters if $\kappa \lae 0.01$ for F-term inflation and $g \lae 0.05$ for D-term inflation.
|
hep-ph/9502340
|
Richard Ball
|
R. D. Ball, S. Forte and G. Ridolfi
|
Scale Dependence and Small-x Behaviour of Polarized Parton Distributions
|
27 pages, TeX with harvmac, 3 figures in compressed postscript. Final
version, to be published in Nucl. Phys. B
|
Nucl.Phys. B444 (1995) 287-309; Erratum-ibid. B449 (1995) 680
|
10.1016/0550-3213(95)00178-U
|
CERN-TH/95-31, GeF-TH-2/95
|
hep-ph
| null |
We discuss perturbative evolution of the polarized structure function g_1 in
the (x,Q^2) plane, with special regard to the small-x region. We determine g_1
in terms of polarized quark and gluon distributions using coefficient functions
to order alpha_s. At small x g_1 then displays substantial scale dependence,
which necessarily implies a corresponding scale dependence in the large-x
region. This scale dependence has significant consequences for the extraction
of the first moment from the experimental data, reducing its value while
increasing the error. Conversely, the scale dependence may be used to constrain
the size of the polarized gluon distribution.
|
[
{
"created": "Fri, 17 Feb 1995 17:51:12 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 1995 11:30:01 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Apr 1995 15:59:03 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Ball",
"R. D.",
""
],
[
"Forte",
"S.",
""
],
[
"Ridolfi",
"G.",
""
]
] |
We discuss perturbative evolution of the polarized structure function g_1 in the (x,Q^2) plane, with special regard to the small-x region. We determine g_1 in terms of polarized quark and gluon distributions using coefficient functions to order alpha_s. At small x g_1 then displays substantial scale dependence, which necessarily implies a corresponding scale dependence in the large-x region. This scale dependence has significant consequences for the extraction of the first moment from the experimental data, reducing its value while increasing the error. Conversely, the scale dependence may be used to constrain the size of the polarized gluon distribution.
|
1307.4551
|
Paolo Gambino
|
Paolo Gambino and Christoph Schwanda
|
Inclusive semileptonic fits, heavy quark masses, and V_cb
|
22 pages, 4 figures. v2: mc value from final version of Ref.[13], a
few clarifications added, PRD version
|
Phys. Rev. D 89, 014022 (2014)
|
10.1103/PhysRevD.89.014022
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform global fits to the moments of semileptonic B decay distributions
and extract |V_cb|, the heavy quark masses, and the non-perturbative parameters
of the heavy quark expansion. We include NNLO perturbative corrections and
recent determinations of the charm mass, and discuss how they improve the
precision of the global fit. In particular, using the m_c determination of
Ref.[11] we get m_b^kin=4.541(23) GeV and |V_cb|=(42.42+- 0.86) 10^{-3}. We
also discuss the implications of the new fits for the normalization of rare B
decays, the zero-recoil sum rule in B-> D* l nu, and the inclusive
determination of |V_ub|.
|
[
{
"created": "Wed, 17 Jul 2013 09:46:39 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jan 2014 16:38:55 GMT",
"version": "v2"
}
] |
2014-01-29
|
[
[
"Gambino",
"Paolo",
""
],
[
"Schwanda",
"Christoph",
""
]
] |
We perform global fits to the moments of semileptonic B decay distributions and extract |V_cb|, the heavy quark masses, and the non-perturbative parameters of the heavy quark expansion. We include NNLO perturbative corrections and recent determinations of the charm mass, and discuss how they improve the precision of the global fit. In particular, using the m_c determination of Ref.[11] we get m_b^kin=4.541(23) GeV and |V_cb|=(42.42+- 0.86) 10^{-3}. We also discuss the implications of the new fits for the normalization of rare B decays, the zero-recoil sum rule in B-> D* l nu, and the inclusive determination of |V_ub|.
|
2309.10023
|
Mario Reig
|
Prateek Agrawal, Nicholas R. Hutzler, David E. Kaplan, Surjeet
Rajendran, Mario Reig
|
Searching for axion forces with spin precession in atoms and molecules
|
9 pages, 2 figures. Comments welcome
| null | null | null |
hep-ph physics.atom-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We propose to use atoms and molecules as quantum sensors of axion-mediated
monopole-dipole forces. We show that electron spin precession experiments using
atomic and molecular beams are well-suited for axion searches thanks to the
presence of co-magnetometer states and single-shot temporal resolution.
Experimental strategies to detect axion gradients from localised sources and
the earth are presented, taking ACME III as a prototype example. Other
possibilities including atomic beams, and laser-cooled atoms and molecules are
discussed.
|
[
{
"created": "Mon, 18 Sep 2023 18:00:00 GMT",
"version": "v1"
}
] |
2023-09-20
|
[
[
"Agrawal",
"Prateek",
""
],
[
"Hutzler",
"Nicholas R.",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Reig",
"Mario",
""
]
] |
We propose to use atoms and molecules as quantum sensors of axion-mediated monopole-dipole forces. We show that electron spin precession experiments using atomic and molecular beams are well-suited for axion searches thanks to the presence of co-magnetometer states and single-shot temporal resolution. Experimental strategies to detect axion gradients from localised sources and the earth are presented, taking ACME III as a prototype example. Other possibilities including atomic beams, and laser-cooled atoms and molecules are discussed.
|
hep-ph/9303296
| null |
M. Dine, A. Kagan and R. G. Leigh
|
Supersymmetry and the Nelson-Barr Mechanism
|
24 pages, 3 figures, phyzzx format; minor adjustments made
|
Phys.Rev.D48:2214-2223,1993
|
10.1103/PhysRevD.48.2214
|
SCIPP 93/05,SLAC-PUB-6090
|
hep-ph
| null |
One possible solution to the strong CP problem is that CP is an exact
symmetry, spontaneously broken at some scale. Some years ago, Nelson and Barr
suggested a mechanism for obtaining $\theta=0$ at tree level in this framework,
and showed that radiative corrections were small in some non-supersymmetric
models. Further investigations suggested that the same could be true in
supersymmetric theories. In this note, we show that these analyses assumed an
extraordinarily high degree of degeneracy among squark masses and among other
supersymmetry breaking parameters. We argue, using naturalness as well as
expectations from string theory, that this is not very plausible.
|
[
{
"created": "Wed, 24 Mar 1993 01:53:19 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 1993 16:57:53 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Dine",
"M.",
""
],
[
"Kagan",
"A.",
""
],
[
"Leigh",
"R. G.",
""
]
] |
One possible solution to the strong CP problem is that CP is an exact symmetry, spontaneously broken at some scale. Some years ago, Nelson and Barr suggested a mechanism for obtaining $\theta=0$ at tree level in this framework, and showed that radiative corrections were small in some non-supersymmetric models. Further investigations suggested that the same could be true in supersymmetric theories. In this note, we show that these analyses assumed an extraordinarily high degree of degeneracy among squark masses and among other supersymmetry breaking parameters. We argue, using naturalness as well as expectations from string theory, that this is not very plausible.
|
1602.05612
|
Radja Boughezal
|
Radja Boughezal, Xiaohui Liu, Frank Petriello
|
A comparison of NNLO QCD predictions with 7 TeV ATLAS and CMS data for
$V$+jet processes
|
20 pages, 13 figures, 4 tables, published version
|
Physics Letters B (2016), pp. 6-13
|
10.1016/j.physletb.2016.06.032
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a detailed comparison of next-to-next-to-leading order (NNLO) QCD
predictions for the W+jet and Z+jet processes with 7 TeV experimental data from
ATLAS and CMS. We observe excellent agreement between theory and data for most
studied observables, which span several orders of magnitude in both cross
section and energy. For some observables, such as the $H_T$ distribution, the
NNLO QCD corrections are essential for resolving existing discrepancies between
theory and data.
|
[
{
"created": "Wed, 17 Feb 2016 22:10:35 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2016 16:36:04 GMT",
"version": "v2"
}
] |
2016-06-27
|
[
[
"Boughezal",
"Radja",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Petriello",
"Frank",
""
]
] |
We perform a detailed comparison of next-to-next-to-leading order (NNLO) QCD predictions for the W+jet and Z+jet processes with 7 TeV experimental data from ATLAS and CMS. We observe excellent agreement between theory and data for most studied observables, which span several orders of magnitude in both cross section and energy. For some observables, such as the $H_T$ distribution, the NNLO QCD corrections are essential for resolving existing discrepancies between theory and data.
|
1808.04619
|
Torbj\"orn Sj\"ostrand
|
Silvia Ferreres-Sol\'e and Torbj\"orn Sj\"ostrand
|
The Space-Time Structure of Hadronization in the Lund Model
|
43 pages. Version 2 contains a new section 3.7 plus a few other minor
additions, as requested by the referee. In addition an updated reference list
and a few typo corrections. None of the original physics arguments or
conclusions are affected, however
| null |
10.1140/epjc/s10052-018-6459-8
|
LU TP 18-18, MCnet-18-20
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The assumption of linear confinement leads to a proportionality of the
energy-momentum and space-time pictures of fragmentation for a simple qqbar
system in the Lund string model. The hadronization of more complicated systems
is more difficult to describe, and in the past only the energy-momentum picture
has been implemented. In this article also the space-time picture is worked
out, for open and closed multiparton topologies, for junction systems, and for
massive quarks. Some first results are presented, for toy systems but in
particular for LHC events. The density of hadron production is quantified under
different conditions. The (not unexpected) conclusion is that this density can
become quite high, and thereby motivate the observed collective behaviour in
high-multiplicity pp collisions. The new framework, made available as part of
the Pythia event generator, offers a starting point for future model building
in a number of respects, such as hadronic rescattering.
|
[
{
"created": "Tue, 14 Aug 2018 10:35:16 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2018 17:41:08 GMT",
"version": "v2"
}
] |
2018-12-26
|
[
[
"Ferreres-Solé",
"Silvia",
""
],
[
"Sjöstrand",
"Torbjörn",
""
]
] |
The assumption of linear confinement leads to a proportionality of the energy-momentum and space-time pictures of fragmentation for a simple qqbar system in the Lund string model. The hadronization of more complicated systems is more difficult to describe, and in the past only the energy-momentum picture has been implemented. In this article also the space-time picture is worked out, for open and closed multiparton topologies, for junction systems, and for massive quarks. Some first results are presented, for toy systems but in particular for LHC events. The density of hadron production is quantified under different conditions. The (not unexpected) conclusion is that this density can become quite high, and thereby motivate the observed collective behaviour in high-multiplicity pp collisions. The new framework, made available as part of the Pythia event generator, offers a starting point for future model building in a number of respects, such as hadronic rescattering.
|
hep-ph/9707336
|
Takeshi Nihei
|
Takeshi Nihei
|
Effect of SUSY phases on the $B^0_d - \bar{B}^0_d$ mixing in the minimal
supergravity model
|
12 pages, 3 figures
|
Prog.Theor.Phys. 98 (1997) 1157-1164
|
10.1143/PTP.98.1157
|
KEK-TH-523, KEK Preprint 97-90
|
hep-ph
| null |
We investigate the effect of SUSY phases ($\theta_A$ and $\theta_\mu$) on the
$B^0_d - \bar{B}^0_d$ mixing in the minimal supergravity model. It is known
that the complex phase $\theta_A$ $=$ arg($A$) ($A$ is the universal
coefficient of the trilinear scalar couplings) is essentially unconstrained by
the electric dipole moment experiment, while the phase $\theta_\mu$ $=$
arg($\mu$) ($\mu$ is the supersymmetric Higgsino mass) is strongly constrained
to zero. We found that $\theta_A$ does not affect the phase of the $B^0_d -
\bar{B}^0_d$ mixing matrix element $M_{12}(B)$ by numerical analysis of the
renormalization group equations. This means that the measurement of the $B^0_d
- \bar{B}^0_d$ mixing at the future B-factory could give the direct information
on the parameters of the CKM matrix even in the framework of the minimal
supergravity model with the SUSY phase $\theta_A$.
|
[
{
"created": "Sun, 13 Jul 1997 03:25:23 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Nihei",
"Takeshi",
""
]
] |
We investigate the effect of SUSY phases ($\theta_A$ and $\theta_\mu$) on the $B^0_d - \bar{B}^0_d$ mixing in the minimal supergravity model. It is known that the complex phase $\theta_A$ $=$ arg($A$) ($A$ is the universal coefficient of the trilinear scalar couplings) is essentially unconstrained by the electric dipole moment experiment, while the phase $\theta_\mu$ $=$ arg($\mu$) ($\mu$ is the supersymmetric Higgsino mass) is strongly constrained to zero. We found that $\theta_A$ does not affect the phase of the $B^0_d - \bar{B}^0_d$ mixing matrix element $M_{12}(B)$ by numerical analysis of the renormalization group equations. This means that the measurement of the $B^0_d - \bar{B}^0_d$ mixing at the future B-factory could give the direct information on the parameters of the CKM matrix even in the framework of the minimal supergravity model with the SUSY phase $\theta_A$.
|
2210.11569
|
Mark Strikman
|
Leonid Frankfurt and Mark Strikman
|
Perturbative QCD Core of Hadrons and Color Transparency Phenomena
|
13 page Contribution to: The Future of Color Transparency and
Hadronization Studies at Jefferson Lab and Beyond
|
MDPI Physics 4(3), 774-786, 2022
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the current paper, we argue that the ground state of a hadron contains a
significant perturbative quantum chromodynamics (pQCD) core as the result of
color gauge invariance and of the values of chiral and gluon vacuum
condensates. The evaluation within the method of dispersion sum rules (DSR) of
the vacuum matrix elements of the correlator of local currents with the proper
quantum numbers leads to the value of the radius of the pQCD core of a nucleon
of about 0.4--0.5 fm. The selection of the initial and final states allows to
select processes in which the pQCD core of the projectile gives the dominant
contribution to the process. It is explained that the transparency of nuclear
matter for the propagation of a spatially small and color-neutral wave packet
of quarks and gluons -- a color transparency (CT) phenomenon -- for a group of
hard processes off nuclear targets can be derived in the form of the QCD
factorization theorem accounting for the color screening phenomenon Based on
the success of the method of DSR, we argue that a pQCD core in a hadron wave
function is surrounded by the layer consisting of quarks interacting with quark
and gluon condensates. As a result, in the quasi-elastic processes $e+A\to e'+N
+(A-1)^{*}$, the quasi-Feynman mechanism could be dominating in a wide range of
the momentum transfer squared, $Q^2$. In this scenario, a virtual photon is
absorbed by a single quark, which carries a large fraction of the momentum of
the nucleon and dominates in a wide range of $Q^2$. CT should reveal itself in
these processes at an extremely large $Q^2$ as the consequence of the presence
of the Sudakov form factors, which squeeze a nucleon.
|
[
{
"created": "Thu, 20 Oct 2022 20:09:39 GMT",
"version": "v1"
}
] |
2022-10-24
|
[
[
"Frankfurt",
"Leonid",
""
],
[
"Strikman",
"Mark",
""
]
] |
In the current paper, we argue that the ground state of a hadron contains a significant perturbative quantum chromodynamics (pQCD) core as the result of color gauge invariance and of the values of chiral and gluon vacuum condensates. The evaluation within the method of dispersion sum rules (DSR) of the vacuum matrix elements of the correlator of local currents with the proper quantum numbers leads to the value of the radius of the pQCD core of a nucleon of about 0.4--0.5 fm. The selection of the initial and final states allows to select processes in which the pQCD core of the projectile gives the dominant contribution to the process. It is explained that the transparency of nuclear matter for the propagation of a spatially small and color-neutral wave packet of quarks and gluons -- a color transparency (CT) phenomenon -- for a group of hard processes off nuclear targets can be derived in the form of the QCD factorization theorem accounting for the color screening phenomenon Based on the success of the method of DSR, we argue that a pQCD core in a hadron wave function is surrounded by the layer consisting of quarks interacting with quark and gluon condensates. As a result, in the quasi-elastic processes $e+A\to e'+N +(A-1)^{*}$, the quasi-Feynman mechanism could be dominating in a wide range of the momentum transfer squared, $Q^2$. In this scenario, a virtual photon is absorbed by a single quark, which carries a large fraction of the momentum of the nucleon and dominates in a wide range of $Q^2$. CT should reveal itself in these processes at an extremely large $Q^2$ as the consequence of the presence of the Sudakov form factors, which squeeze a nucleon.
|
hep-ph/0209029
|
Nicusor Timneanu
|
L. Motyka and N. Timneanu
|
Unintegrated gluon in the photon and heavy quark production
|
24 pages, 11 figures, new references, typos corrected
|
Eur.Phys.J.C27:73-85,2003
|
10.1140/epjc/s2002-01100-8
|
TSL/ISV-2002-0265
|
hep-ph
| null |
The unintegrated gluon density in the photon is determined, using the
Kimber-Martin-Ryskin prescription . In addition, a model of the unintegrated
gluon is proposed, based on the saturation model extended to the large-x
region. These gluon densities are applied to obtain cross sections for charm
and bottom production in gamma-p and gamma-gamma collisions using the k_t
factorization approach. We investigate both direct and resolved photon
contributions and make comparison with the results from the collinear approach
and the experimental data. An enhancement of the cross section due to inclusion
of non-zero transverse momenta of the gluons is found. The charm production
cross section is consistent with the data. The data exceed our conservative
estimate for bottom production in gamma-p collisions, but theoretical
uncertainties are too large to claim a significant inconsistency. A substantial
discrepancy between theory and the experiment is found for gamma gamma -> b
bbar X, not being cured by the k_t factorization approach.
|
[
{
"created": "Tue, 3 Sep 2002 16:02:33 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2002 13:25:39 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Motyka",
"L.",
""
],
[
"Timneanu",
"N.",
""
]
] |
The unintegrated gluon density in the photon is determined, using the Kimber-Martin-Ryskin prescription . In addition, a model of the unintegrated gluon is proposed, based on the saturation model extended to the large-x region. These gluon densities are applied to obtain cross sections for charm and bottom production in gamma-p and gamma-gamma collisions using the k_t factorization approach. We investigate both direct and resolved photon contributions and make comparison with the results from the collinear approach and the experimental data. An enhancement of the cross section due to inclusion of non-zero transverse momenta of the gluons is found. The charm production cross section is consistent with the data. The data exceed our conservative estimate for bottom production in gamma-p collisions, but theoretical uncertainties are too large to claim a significant inconsistency. A substantial discrepancy between theory and the experiment is found for gamma gamma -> b bbar X, not being cured by the k_t factorization approach.
|
2106.11659
|
Xiang-Gan Liu
|
Bu-Yao Qu, Xiang-Gan Liu, Ping-Tao Chen, Gui-Jun Ding
|
Flavor mixing and CP violation from the interplay of $S_4$ modular group
and gCP
|
42 pages, 5 figures
|
Phys. Rev. D 104, 076001 (2021)
|
10.1103/PhysRevD.104.076001
|
USTC-ICTS/PCFT-21-20
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We have performed a systematical analysis of lepton and quark masses models
based on $\Gamma_4\cong S_4$ modular symmetry with gCP symmetry. We have
considered both cases that neutrinos are Majorana particles and Dirac
particles. All possible nontrivial representation assignments of matter fields
are considered, and the most general form of fermion mass matrices are given.
The phenomenologically viable models with the lowest number of free parameters
together with the results of fit are presented. We find out nine lepton models
with seven real free parameters including the real and imaginary parts of
modulus for Majorana neutrinos, which can accommodate the lepton masses and
neutrino oscillation data. The prediction for leptogenesis is studied in an
example lepton model. The observed baryon asymmetry as well as lepton masses
and mixing angles can be explained. For Dirac neutrinos, four lepton models
with five real free couplings are compatible with experimental data. Ten quark
models containing seven couplings are found to be able to accommodate the
hierarchical quark masses and mixing angles and CP violation phase.
Furthermore, the $S_4$ modular symmetry can provide a unified description of
lepton and quark flavor structure, and a benchmark model is presented.
|
[
{
"created": "Tue, 22 Jun 2021 10:34:35 GMT",
"version": "v1"
}
] |
2021-10-13
|
[
[
"Qu",
"Bu-Yao",
""
],
[
"Liu",
"Xiang-Gan",
""
],
[
"Chen",
"Ping-Tao",
""
],
[
"Ding",
"Gui-Jun",
""
]
] |
We have performed a systematical analysis of lepton and quark masses models based on $\Gamma_4\cong S_4$ modular symmetry with gCP symmetry. We have considered both cases that neutrinos are Majorana particles and Dirac particles. All possible nontrivial representation assignments of matter fields are considered, and the most general form of fermion mass matrices are given. The phenomenologically viable models with the lowest number of free parameters together with the results of fit are presented. We find out nine lepton models with seven real free parameters including the real and imaginary parts of modulus for Majorana neutrinos, which can accommodate the lepton masses and neutrino oscillation data. The prediction for leptogenesis is studied in an example lepton model. The observed baryon asymmetry as well as lepton masses and mixing angles can be explained. For Dirac neutrinos, four lepton models with five real free couplings are compatible with experimental data. Ten quark models containing seven couplings are found to be able to accommodate the hierarchical quark masses and mixing angles and CP violation phase. Furthermore, the $S_4$ modular symmetry can provide a unified description of lepton and quark flavor structure, and a benchmark model is presented.
|
1005.4599
|
Carlo Giunti Dr.
|
Carlo Giunti, Marco Laveder
|
Short-Baseline Electron Neutrino Disappearance, Tritium Beta Decay and
Neutrinoless Double-Beta Decay
|
14 pages; final version published in Phys.Rev.D82:053005,2010
|
Phys.Rev.D82:053005,2010
|
10.1103/PhysRevD.82.053005
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the interpretation of the MiniBooNE low-energy anomaly and the
Gallium radioactive source experiments anomaly in terms of short-baseline
electron neutrino disappearance in the framework of 3+1 four-neutrino mixing
schemes. The separate fits of MiniBooNE and Gallium data are highly compatible,
with close best-fit values of the effective oscillation parameters Delta m^2
and sin^2 2 theta. The combined fit gives Delta m^2 >~ 0.1 eV^2 and 0.11 <
sin^2 2 theta < 0.48 at 2 sigma. We consider also the data of the Bugey and
Chooz reactor antineutrino oscillation experiments and the limits on the
effective electron antineutrino mass in beta-decay obtained in the Mainz and
Troitsk Tritium experiments. The fit of the data of these experiments limits
the value of sin^2 2 theta below 0.10 at 2 sigma. Considering the tension
between the neutrino MiniBooNE and Gallium data and the antineutrino reactor
and Tritium data as a statistical fluctuation, we perform a combined fit which
gives Delta m^2 \simeq 2 eV and 0.01 < sin^2 2 theta < 0.13 at 2 sigma.
Assuming a hierarchy of masses m_1, m_2, m_3 << m_4, the predicted
contributions of m_4 to the effective neutrino masses in beta-decay and
neutrinoless double-beta-decay are, respectively, between about 0.06 and 0.49
and between about 0.003 and 0.07 eV at 2 sigma. We also consider the
possibility of reconciling the tension between the neutrino MiniBooNE and
Gallium data and the antineutrino reactor and Tritium data with different
mixings in the neutrino and antineutrino sectors. We find a 2.6 sigma
indication of a mixing angle asymmetry.
|
[
{
"created": "Tue, 25 May 2010 15:05:24 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2010 09:06:05 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Aug 2010 14:14:05 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Oct 2010 10:54:38 GMT",
"version": "v4"
}
] |
2010-10-12
|
[
[
"Giunti",
"Carlo",
""
],
[
"Laveder",
"Marco",
""
]
] |
We consider the interpretation of the MiniBooNE low-energy anomaly and the Gallium radioactive source experiments anomaly in terms of short-baseline electron neutrino disappearance in the framework of 3+1 four-neutrino mixing schemes. The separate fits of MiniBooNE and Gallium data are highly compatible, with close best-fit values of the effective oscillation parameters Delta m^2 and sin^2 2 theta. The combined fit gives Delta m^2 >~ 0.1 eV^2 and 0.11 < sin^2 2 theta < 0.48 at 2 sigma. We consider also the data of the Bugey and Chooz reactor antineutrino oscillation experiments and the limits on the effective electron antineutrino mass in beta-decay obtained in the Mainz and Troitsk Tritium experiments. The fit of the data of these experiments limits the value of sin^2 2 theta below 0.10 at 2 sigma. Considering the tension between the neutrino MiniBooNE and Gallium data and the antineutrino reactor and Tritium data as a statistical fluctuation, we perform a combined fit which gives Delta m^2 \simeq 2 eV and 0.01 < sin^2 2 theta < 0.13 at 2 sigma. Assuming a hierarchy of masses m_1, m_2, m_3 << m_4, the predicted contributions of m_4 to the effective neutrino masses in beta-decay and neutrinoless double-beta-decay are, respectively, between about 0.06 and 0.49 and between about 0.003 and 0.07 eV at 2 sigma. We also consider the possibility of reconciling the tension between the neutrino MiniBooNE and Gallium data and the antineutrino reactor and Tritium data with different mixings in the neutrino and antineutrino sectors. We find a 2.6 sigma indication of a mixing angle asymmetry.
|
hep-ph/0604073
|
Susumu Koretune
|
Susumu Koretune
|
The sum rules for the spin dependent structure functions $g_1$ in the
isovector reaction
|
Eq.(9) is corrected. The correction is minor and does not affect the
disscusion and the conclusion in the paper
|
Phys.Rev.C73:058201,2006; Erratum-ibid.C74:049902,2006;
Phys.Rev.C74:049902,2006
|
10.1103/PhysRevC.73.058201 10.1103/PhysRevC.74.049902
| null |
hep-ph nucl-th
| null |
In the isovector reaction, the sum rule for the spin dependent function $g_1$
which is related to the cross section of the photoproduction is derived. In the
small $Q^2$ region, the sum rule is dominated by the low energy contribution
and it tightly connects the resonance, the elastic, and the non-resonant
contributions.
|
[
{
"created": "Fri, 7 Apr 2006 15:18:48 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2006 01:31:03 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Koretune",
"Susumu",
""
]
] |
In the isovector reaction, the sum rule for the spin dependent function $g_1$ which is related to the cross section of the photoproduction is derived. In the small $Q^2$ region, the sum rule is dominated by the low energy contribution and it tightly connects the resonance, the elastic, and the non-resonant contributions.
|
1601.05237
|
Carlos Alberto Vaquera-Araujo
|
Jos\'e W.F. Valle and C.A. Vaquera-Araujo
|
Dynamical seesaw mechanism for Dirac neutrinos
|
7 pages, 1 figure
| null |
10.1016/j.physletb.2016.02.031
|
IFIC/16-XX
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
So far we have not been able to establish that, as theoretically expected,
neutrinos are their own anti-particles. Here we propose a dynamical way to
account for the Dirac nature of neutrinos and the smallness of their mass in
terms of a new variant of the seesaw paradigm in which the energy scale of
neutrino mass generation could be accessible to the current LHC experiments.
|
[
{
"created": "Wed, 20 Jan 2016 11:02:51 GMT",
"version": "v1"
}
] |
2016-02-24
|
[
[
"Valle",
"José W. F.",
""
],
[
"Vaquera-Araujo",
"C. A.",
""
]
] |
So far we have not been able to establish that, as theoretically expected, neutrinos are their own anti-particles. Here we propose a dynamical way to account for the Dirac nature of neutrinos and the smallness of their mass in terms of a new variant of the seesaw paradigm in which the energy scale of neutrino mass generation could be accessible to the current LHC experiments.
|
1409.2297
|
Luminita Mihaila
|
D. Kunz, L. Mihaila and N. Zerf
|
O(\alpha_s^2) corrections to the running top-Yukawa coupling and the
mass of the lightest Higgs boson in the MSSM
|
24 pages, 9 figures; one more figure added; reference list extended
| null |
10.1007/JHEP12(2014)136
|
SFB/CPP-14-61, TTP/TTP14-025, Alberta Thy 14-14
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we propose a method to compute the running top-Yukawa coupling
in supersymmetric models with heavy mass spectrum based on the "running" and
"decoupling" procedure. In order to enable this approach we compute the
two-loop SUSY-QCD radiative corrections required in the decoupling process. The
method has the advantage that large logarithmic corrections are automatically
resummed through the Renormalization Group Equations. As phenomenological
application we study the effects of this approach on the prediction of the
lightest Higgs boson mass at three-loop accuracy. We observe a significant
reduction of the renormalization scale dependence as compared to the direct
method, that is based on the conversion relation between the running and pole
mass for the top quark. The effect of resummation of large logarithmic
contributions consists in an increased prediction for the Higgs boson mass, an
observation in agreement with the previous analyses.
|
[
{
"created": "Mon, 8 Sep 2014 11:39:13 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Dec 2014 08:51:52 GMT",
"version": "v2"
}
] |
2015-06-22
|
[
[
"Kunz",
"D.",
""
],
[
"Mihaila",
"L.",
""
],
[
"Zerf",
"N.",
""
]
] |
In this paper we propose a method to compute the running top-Yukawa coupling in supersymmetric models with heavy mass spectrum based on the "running" and "decoupling" procedure. In order to enable this approach we compute the two-loop SUSY-QCD radiative corrections required in the decoupling process. The method has the advantage that large logarithmic corrections are automatically resummed through the Renormalization Group Equations. As phenomenological application we study the effects of this approach on the prediction of the lightest Higgs boson mass at three-loop accuracy. We observe a significant reduction of the renormalization scale dependence as compared to the direct method, that is based on the conversion relation between the running and pole mass for the top quark. The effect of resummation of large logarithmic contributions consists in an increased prediction for the Higgs boson mass, an observation in agreement with the previous analyses.
|
hep-ph/0203178
|
Yeinzon Rodriguez Garcia
|
Yeinzon Rodriguez and Carlos Quimbay (Universidad Nacional de
Colombia)
|
Spontaneous CP Phases and Flavour Changing Neutral Currents in the
Left-Right Symmetric Model
|
LaTex File, 31 pages, no figures. Minor grammatical changes.
References updated and one added. Version to appear in Nuclear Physics B
|
Nucl.Phys. B637 (2002) 219-242
|
10.1016/S0550-3213(02)00397-8
|
FIUN-CP-02/1
|
hep-ph
| null |
We study the behaviour of the flavour changing neutral currents in the
Left-Right Symmetric Model related to the presence of spontaneous CP phases. To
do this, we explore four cases corresponding to combinations of maximal and no
CP violation in both the lepton and quark sector. We find that we can constrain
the flavour changing neutral currents to the experimental limit, by adjusting
the CP-violating phase of the quark sector, opening the possibility to obtain a
large CP violation in the lepton sector as well as new Higgs bosons at the
electroweak scale.
|
[
{
"created": "Tue, 19 Mar 2002 15:07:50 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 2002 13:54:15 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Rodriguez",
"Yeinzon",
"",
"Universidad Nacional de\n Colombia"
],
[
"Quimbay",
"Carlos",
"",
"Universidad Nacional de\n Colombia"
]
] |
We study the behaviour of the flavour changing neutral currents in the Left-Right Symmetric Model related to the presence of spontaneous CP phases. To do this, we explore four cases corresponding to combinations of maximal and no CP violation in both the lepton and quark sector. We find that we can constrain the flavour changing neutral currents to the experimental limit, by adjusting the CP-violating phase of the quark sector, opening the possibility to obtain a large CP violation in the lepton sector as well as new Higgs bosons at the electroweak scale.
|
2111.12091
|
Volodymyr Takhistov
|
Syuhei Iguro, Ryan Plestid, Volodymyr Takhistov
|
Monopoles From an Atmospheric Fixed Target Experiment
|
8 pages, 4 figures; v2: matches version accepted to PRL
|
Phys. Rev. Lett. 128, 201101 (2022)
|
10.1103/PhysRevLett.128.201101
|
FERMILAB-PUB-21-617-T, IPMU21-0081, TTP21-051
|
hep-ph astro-ph.CO astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Magnetic monopoles have a long history of theoretical predictions and
experimental searches, carrying direct implications for fundamental concepts
such as electric charge quantization. We analyze in detail for the first time
magnetic monopole production from collisions of cosmic rays bombarding the
atmosphere. This source of monopoles is independent of cosmology, has been
active throughout Earth's history, and supplies an irreducible monopole flux
for all terrestrial experiments. Using results for robust atmospheric fixed
target experiment flux of monopoles, we systematically establish direct
comparisons of previous ambient monopole searches with monopole searches at
particle colliders and set leading limits on magnetic monopole production in
the $\sim 5-100$ TeV mass-range.
|
[
{
"created": "Tue, 23 Nov 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2022 07:13:03 GMT",
"version": "v2"
}
] |
2022-05-23
|
[
[
"Iguro",
"Syuhei",
""
],
[
"Plestid",
"Ryan",
""
],
[
"Takhistov",
"Volodymyr",
""
]
] |
Magnetic monopoles have a long history of theoretical predictions and experimental searches, carrying direct implications for fundamental concepts such as electric charge quantization. We analyze in detail for the first time magnetic monopole production from collisions of cosmic rays bombarding the atmosphere. This source of monopoles is independent of cosmology, has been active throughout Earth's history, and supplies an irreducible monopole flux for all terrestrial experiments. Using results for robust atmospheric fixed target experiment flux of monopoles, we systematically establish direct comparisons of previous ambient monopole searches with monopole searches at particle colliders and set leading limits on magnetic monopole production in the $\sim 5-100$ TeV mass-range.
|
hep-ph/0211326
|
K. A. Oganessyan
|
K.A. Oganessyan, L.S. Asilyan, E. De Sanctis, V. Muccifora
|
Azimuthal Asymmetries: Access to Novel Structure Functions
|
6 pages, LaTeX, 7 eps figures, Talk presented at the 15th
International Spin Physics Symposium, Spin 2002, Brookhaven National
Laboratory, September 9-14, 2002
| null |
10.1063/1.1607174
| null |
hep-ph
| null |
One of the most interesting consequence of non-zero intrinsic transverse
momentum of partons in the nucleon is the nontrivial azimuthal dependence of
the cross section of hard scattering processes. Many of the observable
asymmetries contain unknown functions which provide essential information on
the quark and gluon structure. Several of them have been studied in the last
few years; we discuss their qualitative and quantitative features in
semi-inclusive DIS.
|
[
{
"created": "Wed, 20 Nov 2002 22:19:05 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Oganessyan",
"K. A.",
""
],
[
"Asilyan",
"L. S.",
""
],
[
"De Sanctis",
"E.",
""
],
[
"Muccifora",
"V.",
""
]
] |
One of the most interesting consequence of non-zero intrinsic transverse momentum of partons in the nucleon is the nontrivial azimuthal dependence of the cross section of hard scattering processes. Many of the observable asymmetries contain unknown functions which provide essential information on the quark and gluon structure. Several of them have been studied in the last few years; we discuss their qualitative and quantitative features in semi-inclusive DIS.
|
1009.1692
|
Yi Liao
|
Yi Liao
|
Unique Neutrino Mass Operator at any Mass Dimension
|
6 pages, 1 figure; v2: modified/added a few sentences, more
acknowledgement, added a ref to [7] and a new [8], typos fixed, proofread
version for Phys Lett B
|
Phys.Lett.B694:346-348,2011
|
10.1016/j.physletb.2010.10.005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When the standard model is viewed as a low energy effective theory, the
neutrinos can obtain mass from higher dimensional operators. It has been known
for long that such an operator first appears at mass dimension five and that it
is unique. Here we show that the effective neutrino mass operator at every
higher dimension is unique. This general claim is established using Young
tableau, and illustrated by exhausting all potentially different operators at
dimension seven. The result is relevant to the search of new physics effects
beyond neutrino mass that can arise at a relatively low energy scale.
|
[
{
"created": "Thu, 9 Sep 2010 06:31:29 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 2010 12:51:24 GMT",
"version": "v2"
}
] |
2011-06-27
|
[
[
"Liao",
"Yi",
""
]
] |
When the standard model is viewed as a low energy effective theory, the neutrinos can obtain mass from higher dimensional operators. It has been known for long that such an operator first appears at mass dimension five and that it is unique. Here we show that the effective neutrino mass operator at every higher dimension is unique. This general claim is established using Young tableau, and illustrated by exhausting all potentially different operators at dimension seven. The result is relevant to the search of new physics effects beyond neutrino mass that can arise at a relatively low energy scale.
|
2108.04017
|
Ajay Kumar Rai
|
Rohit Tiwari, D P Rathaud and A K Rai
|
Spectroscopy of all charm tetraquark states
|
19 pages
| null |
10.1007/s12648-022-02427-8
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The mass spectra of all-charm tetraquark states with the
[cc][$\bar{c}\bar{c}$] quark configuration are investigated. The coulomb plus
linear potential is used in conjunction with the relativistic mass correction
term $\mathcal{O}(\frac{1}{m})$. To determine the fitting parameters for
all-charm tetraquarks states [cc][$\bar{c}\bar{c}$], we first calculate the
mass spectra of charmonia [c$\bar{c}$] and its decay constants ($f^{2}_{P/V}$).
We estimated the masses of the tetraquark states in their ground and radially
excited states. For mass spectra of tetraquark states, we also included
spin-spin, spin-orbital, and tensor interactions. The mass spectra of charmonia
produced in this study are reasonably consistent with experimental and
theoretical predictions made by others, whilst the mass spectra of the
tetraquark states are consistent with previous theoretical predictions. We
propose that the X(6900) state, which has a mass range of 6.2 - 6.9 GeV and was
recently detected by LHCb, has the quantum numbers $0^{-+}$, $1^{-+}$, $2^{-+}$
and belongs to the P-wave of the all-cham tetraquark state.
|
[
{
"created": "Mon, 9 Aug 2021 13:16:14 GMT",
"version": "v1"
}
] |
2022-08-10
|
[
[
"Tiwari",
"Rohit",
""
],
[
"Rathaud",
"D P",
""
],
[
"Rai",
"A K",
""
]
] |
The mass spectra of all-charm tetraquark states with the [cc][$\bar{c}\bar{c}$] quark configuration are investigated. The coulomb plus linear potential is used in conjunction with the relativistic mass correction term $\mathcal{O}(\frac{1}{m})$. To determine the fitting parameters for all-charm tetraquarks states [cc][$\bar{c}\bar{c}$], we first calculate the mass spectra of charmonia [c$\bar{c}$] and its decay constants ($f^{2}_{P/V}$). We estimated the masses of the tetraquark states in their ground and radially excited states. For mass spectra of tetraquark states, we also included spin-spin, spin-orbital, and tensor interactions. The mass spectra of charmonia produced in this study are reasonably consistent with experimental and theoretical predictions made by others, whilst the mass spectra of the tetraquark states are consistent with previous theoretical predictions. We propose that the X(6900) state, which has a mass range of 6.2 - 6.9 GeV and was recently detected by LHCb, has the quantum numbers $0^{-+}$, $1^{-+}$, $2^{-+}$ and belongs to the P-wave of the all-cham tetraquark state.
|
1906.00894
|
Yoshitaka Hatta
|
Yoshitaka Hatta, Abha Rajan, Di-Lun Yang
|
Near threshold $J/\psi$ and $\Upsilon$ photo-production at JLab and RHIC
|
10 pages, 9 figures
|
Phys. Rev. D 100, 014032 (2019)
|
10.1103/PhysRevD.100.014032
|
YITP-19-46
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We update our previous calculation of $J/\psi$ photo-production near
threshold \cite{Hatta:2018ina} by incorporating the recent developments in
theory and the new experimental data from the GlueX collaboration at Jefferson
Lab \cite{Ali:2019lzf}. We then propose to study the near threshold production
of $\Upsilon$ and $J/\psi$ in ultraperipheral $pA$ collisions at RHIC. These
processes are sensitive to the gluon condensate in the proton which is related
to the QCD trace anomaly. Our result emphasizes the role of gluons as the
origin of the proton mass.
|
[
{
"created": "Mon, 3 Jun 2019 15:50:34 GMT",
"version": "v1"
}
] |
2019-08-07
|
[
[
"Hatta",
"Yoshitaka",
""
],
[
"Rajan",
"Abha",
""
],
[
"Yang",
"Di-Lun",
""
]
] |
We update our previous calculation of $J/\psi$ photo-production near threshold \cite{Hatta:2018ina} by incorporating the recent developments in theory and the new experimental data from the GlueX collaboration at Jefferson Lab \cite{Ali:2019lzf}. We then propose to study the near threshold production of $\Upsilon$ and $J/\psi$ in ultraperipheral $pA$ collisions at RHIC. These processes are sensitive to the gluon condensate in the proton which is related to the QCD trace anomaly. Our result emphasizes the role of gluons as the origin of the proton mass.
|
1511.02350
|
Andrew Papanastasiou
|
Stefan Liebler, Gudrid Moortgat-Pick, Andrew S. Papanastasiou
|
Probing the top-quark width through ratios of resonance contributions of
$e^+e^-\rightarrow W^+W^-b\bar{b}$
|
31 pages, 10 figures, 2 tables
| null |
10.1007/JHEP03(2016)099
|
Cavendish-HEP-15/11, DESY 15-169
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We exploit offshell regions in the process $e^+e^-\rightarrow W^+W^-b\bar{b}$
to gain access to the top-quark width. Working at next-to-leading order in QCD
we show that carefully selected ratios of offshell regions to onshell regions
in the reconstructed top and antitop invariant mass spectra are,
\emph{independently} of the coupling $g_{tbW}$, sensitive to the top-quark
width. We explore this approach for different centre of mass energies and
initial-state beam polarisations at $e^+e^-$ colliders and briefly comment on
the applicability of this method for a measurement of the top-quark width at
the LHC.
|
[
{
"created": "Sat, 7 Nov 2015 12:15:06 GMT",
"version": "v1"
}
] |
2016-04-20
|
[
[
"Liebler",
"Stefan",
""
],
[
"Moortgat-Pick",
"Gudrid",
""
],
[
"Papanastasiou",
"Andrew S.",
""
]
] |
We exploit offshell regions in the process $e^+e^-\rightarrow W^+W^-b\bar{b}$ to gain access to the top-quark width. Working at next-to-leading order in QCD we show that carefully selected ratios of offshell regions to onshell regions in the reconstructed top and antitop invariant mass spectra are, \emph{independently} of the coupling $g_{tbW}$, sensitive to the top-quark width. We explore this approach for different centre of mass energies and initial-state beam polarisations at $e^+e^-$ colliders and briefly comment on the applicability of this method for a measurement of the top-quark width at the LHC.
|
1103.2915
|
Luca Merlo Dr.
|
R. Alonso, M.B. Gavela, L. Merlo and S. Rigolin
|
On The Potential of Minimal Flavour Violation
|
33 pages, 6 figures; Note added in proof on the stability of the
minima of the scalar potential; results unchanged; references added
|
JHEP 1107:012,2011
|
10.1007/JHEP07(2011)012
|
FTUAM-11-39, IFT-UAM/CSIC-11-09, TUM-HEP-796/11, DFPD-11-TH-2
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Assuming the Minimal Flavour Violation hypothesis, we derive the general
scalar potential for fields whose background values are the Yukawa couplings.
We analyze the minimum of the potential and discuss the fine-tuning required to
dynamically generate the mass hierarchies and the mixings between different
quark generations. Two main cases are considered, corresponding to Yukawa
interactions being effective operators of dimension five or six (or,
equivalently, resulting from bi-fundamental and fundamental scalar fields,
respectively). At the renormalizable and classical level, no mixing is
naturally induced from dimension five Yukawa operators. On the contrary, from
dimension six Yukawa operators one mixing angle and a strong mass hierarchy
among the generations result.
|
[
{
"created": "Tue, 15 Mar 2011 14:12:22 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Apr 2011 16:54:08 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Jun 2011 19:51:15 GMT",
"version": "v3"
}
] |
2011-07-13
|
[
[
"Alonso",
"R.",
""
],
[
"Gavela",
"M. B.",
""
],
[
"Merlo",
"L.",
""
],
[
"Rigolin",
"S.",
""
]
] |
Assuming the Minimal Flavour Violation hypothesis, we derive the general scalar potential for fields whose background values are the Yukawa couplings. We analyze the minimum of the potential and discuss the fine-tuning required to dynamically generate the mass hierarchies and the mixings between different quark generations. Two main cases are considered, corresponding to Yukawa interactions being effective operators of dimension five or six (or, equivalently, resulting from bi-fundamental and fundamental scalar fields, respectively). At the renormalizable and classical level, no mixing is naturally induced from dimension five Yukawa operators. On the contrary, from dimension six Yukawa operators one mixing angle and a strong mass hierarchy among the generations result.
|
hep-ph/0010015
|
Christophe Royon
|
C. Royon (Saclay, BNL, UTA), L. Schoeffel (Saclay), J.Bartels
(Hamburg), H.Jung (Lund), R.Peschanski (Saclay)
|
QCD analysis of the diffractive structure function F_2^{D(3)}
|
24 pages
|
Phys.Rev.D63:074004,2001
|
10.1103/PhysRevD.63.074004
| null |
hep-ph
| null |
The proton diffractive structure function $F_2^{D(3)}$ measured in the H1 and
ZEUS experiments at HERA is analyzed in terms of both Regge phenomenology and
perturbative QCD evolution. A new method determines the values of the Regge
intercepts in ``hard'' diffraction, confirming a higher value of the Pomeron
intercept than for soft physics. The data are well described by a QCD analysis
in which point-like parton distributions, evolving according to the DGLAP
equations, are assigned to the leading and sub-leading Regge exchanges. The
gluon distributions are found to be quite different for H1 and ZEUS. A {\it
global fit} analysis, where a higher twist component is taken from models,
allows us to use data in the whole available range in diffractive mass and
gives a stable answer for the leading twist contribution. We give sets of quark
and gluon parton distributions for the Pomeron, and predictions for the charm
and the longitudinal proton diffractive structure function from the QCD fit. An
extrapolation to the Tevatron range is compared with CDF data on single
diffraction. Conclusions on factorization breaking depend critically whether H1
(strong violation) or ZEUS (compatibility at low $\beta$) fits are taken into
account.
|
[
{
"created": "Tue, 3 Oct 2000 01:06:21 GMT",
"version": "v1"
}
] |
2010-03-25
|
[
[
"Royon",
"C.",
"",
"Saclay, BNL, UTA"
],
[
"Schoeffel",
"L.",
"",
"Saclay"
],
[
"Bartels",
"J.",
"",
"Hamburg"
],
[
"Jung",
"H.",
"",
"Lund"
],
[
"Peschanski",
"R.",
"",
"Saclay"
]
] |
The proton diffractive structure function $F_2^{D(3)}$ measured in the H1 and ZEUS experiments at HERA is analyzed in terms of both Regge phenomenology and perturbative QCD evolution. A new method determines the values of the Regge intercepts in ``hard'' diffraction, confirming a higher value of the Pomeron intercept than for soft physics. The data are well described by a QCD analysis in which point-like parton distributions, evolving according to the DGLAP equations, are assigned to the leading and sub-leading Regge exchanges. The gluon distributions are found to be quite different for H1 and ZEUS. A {\it global fit} analysis, where a higher twist component is taken from models, allows us to use data in the whole available range in diffractive mass and gives a stable answer for the leading twist contribution. We give sets of quark and gluon parton distributions for the Pomeron, and predictions for the charm and the longitudinal proton diffractive structure function from the QCD fit. An extrapolation to the Tevatron range is compared with CDF data on single diffraction. Conclusions on factorization breaking depend critically whether H1 (strong violation) or ZEUS (compatibility at low $\beta$) fits are taken into account.
|
1206.1966
|
Fredy Ochoa
|
M. E. Cata\~no, R Mart\'inez and F. Ochoa
|
Neutrino masses in a 331 model with right-handed neutrinos without
doubly charged Higgs
| null |
Phys.Rev. D 86, 073015 (2012)
|
10.1103/PhysRevD.86.073015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a 331 model with three scalar triplets and neutral fermion
singlets. We show that in the 331 model with right-handed neutrinos, it is
possible to obtain small active neutrino masses via the double and inverse
seesaw mechanisms, without the use of scalar sextets or triplets with
doubly-charged Higgs. Two types of models are discussed. If we have a large
Majorana mass matrix for the singlets, the spectrum of neutrinos presents
light, heavy and very heavy masses. The other possibility is a small (zero)
Majorana mass matrix, which leads to pseudo-Dirac (Dirac) heavy neutrinos in
the TeV scale, in addition to the active light neutrinos
|
[
{
"created": "Sat, 9 Jun 2012 19:36:15 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2012 01:04:31 GMT",
"version": "v2"
}
] |
2012-11-13
|
[
[
"Cataño",
"M. E.",
""
],
[
"Martínez",
"R",
""
],
[
"Ochoa",
"F.",
""
]
] |
We discuss a 331 model with three scalar triplets and neutral fermion singlets. We show that in the 331 model with right-handed neutrinos, it is possible to obtain small active neutrino masses via the double and inverse seesaw mechanisms, without the use of scalar sextets or triplets with doubly-charged Higgs. Two types of models are discussed. If we have a large Majorana mass matrix for the singlets, the spectrum of neutrinos presents light, heavy and very heavy masses. The other possibility is a small (zero) Majorana mass matrix, which leads to pseudo-Dirac (Dirac) heavy neutrinos in the TeV scale, in addition to the active light neutrinos
|
hep-ph/0510296
|
Mu-Chun Chen
|
Mu-Chun Chen and K.T. Mahanthappa
|
Fermion Mixing and Soft Leptogenesis in a SUSY SO(10) x SU(2)_F Model
|
Talk presented at EPS International Europhysics Conference on High
Energy Physics (EPS-HEP2005), Lisbon, Portugal, 21-27 Jul 2005
|
PoS HEP2005, 356 (2006)
| null |
COLO-HEP-511, FERMILAB-CONF-05-435-T
|
hep-ph
| null |
We have constructed a SUSY SO(10) x SU(2)_F model in which a set of symmetric
mass matrices with five texture zeros (having 11 parameters) leads to 22
measurable fermion masses, mixing angles and CP phases, all in agreement with
available experimental data within one sigma. The LMA solution for solar
neutrinos is obtained as well as neutrino mixing angles and absolute values of
neutrino masses. We have investigated the possibility of baryogenesis resulting
from soft leptogenesis. We find that, with soft SUSY masses assuming their
natural values of the order of a TeV, the observed baryon asymmetry in the
Universe can be accommodated in our model. Unlike models with lop-sided
textures which give rise to a dangerously large decay rate for mu -> e + gamma,
the decay rate we get is much suppressed and yet it is large enough to be
accessible to the next generation of experiments.
|
[
{
"created": "Fri, 21 Oct 2005 22:49:45 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
]
] |
We have constructed a SUSY SO(10) x SU(2)_F model in which a set of symmetric mass matrices with five texture zeros (having 11 parameters) leads to 22 measurable fermion masses, mixing angles and CP phases, all in agreement with available experimental data within one sigma. The LMA solution for solar neutrinos is obtained as well as neutrino mixing angles and absolute values of neutrino masses. We have investigated the possibility of baryogenesis resulting from soft leptogenesis. We find that, with soft SUSY masses assuming their natural values of the order of a TeV, the observed baryon asymmetry in the Universe can be accommodated in our model. Unlike models with lop-sided textures which give rise to a dangerously large decay rate for mu -> e + gamma, the decay rate we get is much suppressed and yet it is large enough to be accessible to the next generation of experiments.
|
1304.7809
|
Tom Melia
|
Tom Melia
|
Dyck Words and Multi-Quark Primitive Amplitudes
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I study group theory (Kleiss-Kuijf) relations between purely multi-quark
primitive amplitudes at tree level, and prove that they reduce the number of
independent primitives to (n-2)!/(n/2)!, where n is the number of quarks plus
antiquarks, in the case where quark lines have different flavours. I give an
explicit example of an independent basis of primitives for any n which is of
the form A(1,2,sigma), where sigma is a permutation based on a Dyck word.
|
[
{
"created": "Mon, 29 Apr 2013 21:28:39 GMT",
"version": "v1"
}
] |
2013-05-01
|
[
[
"Melia",
"Tom",
""
]
] |
I study group theory (Kleiss-Kuijf) relations between purely multi-quark primitive amplitudes at tree level, and prove that they reduce the number of independent primitives to (n-2)!/(n/2)!, where n is the number of quarks plus antiquarks, in the case where quark lines have different flavours. I give an explicit example of an independent basis of primitives for any n which is of the form A(1,2,sigma), where sigma is a permutation based on a Dyck word.
|
1007.3616
|
Luis Filipe Matos
|
Luis Matos
|
Gauge Mediation with Gauge Messengers in SU(5)
|
33 pages, 7 figures, version submitted to jhep
|
JHEP 1012:042,2010
|
10.1007/JHEP12(2010)042
|
IPPP/10/59DCPT/10/118
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The inclusion of gauge messengers in models of gauge mediation allows for
more general predictions that those described by the framework of general gauge
mediation. Motivated by this, we explore some models of gauge mediation with
gauge messengers in SU(5) GUTs. In most previous attempts of building viable
models where gauge messengers play a role in determining the soft terms, squark
and/or slepton masses turned out to be tachyonic. The objective of this paper
is to address this problem and propose two possible solutions, one of which has
a natural realization in the solution of the doublet-triplet problem. Another
interesting result is that in these models the association of SUSY breaking
with the breaking of the GUT group provides a simple mechanism that can explain
why $SU(5)\rightarrow SU(3)\times SU(2) \times U(1)$ is preferred over other
symmetry breaking patterns.
|
[
{
"created": "Wed, 21 Jul 2010 11:20:33 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jul 2010 08:55:30 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Oct 2010 15:18:45 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Nov 2010 10:07:19 GMT",
"version": "v4"
}
] |
2010-12-15
|
[
[
"Matos",
"Luis",
""
]
] |
The inclusion of gauge messengers in models of gauge mediation allows for more general predictions that those described by the framework of general gauge mediation. Motivated by this, we explore some models of gauge mediation with gauge messengers in SU(5) GUTs. In most previous attempts of building viable models where gauge messengers play a role in determining the soft terms, squark and/or slepton masses turned out to be tachyonic. The objective of this paper is to address this problem and propose two possible solutions, one of which has a natural realization in the solution of the doublet-triplet problem. Another interesting result is that in these models the association of SUSY breaking with the breaking of the GUT group provides a simple mechanism that can explain why $SU(5)\rightarrow SU(3)\times SU(2) \times U(1)$ is preferred over other symmetry breaking patterns.
|
1807.05930
|
A. F. W. van Hameren
|
Andreas van Hameren
|
One-loop amplitudes for k_T-dependent factorization
|
Contribution to the proceedings of "Loops and Legs 2018"
| null | null |
IFJPAN-IV-2018-13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I report on progress in the calculation of one-loop amplitudes with a
space-like gluon. Amplitudes with space-like partons are relevant for
factorization procedure s that require initial-state partons with non-vanishing
transverse momentum components.
|
[
{
"created": "Mon, 16 Jul 2018 15:44:23 GMT",
"version": "v1"
}
] |
2018-07-17
|
[
[
"van Hameren",
"Andreas",
""
]
] |
I report on progress in the calculation of one-loop amplitudes with a space-like gluon. Amplitudes with space-like partons are relevant for factorization procedure s that require initial-state partons with non-vanishing transverse momentum components.
|
1204.1984
|
Eef van Beveren
|
Eef van Beveren and George Rupp
|
Comment on "Observation of a New chi_b State in Radiative Transitions to
Upsilon_1S and Upsilon_2S at ATLAS"
|
1 page, 2 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We comment on the recent observation of chi_b states by the ATLAS
Collaboration and contest their peremptory interpretation of the highest of the
three observed structures as the chi_b(3P) system. Moreover, we do not agree
that from their data the mass barycenter of the chi_b(3P) system can be
determined.
|
[
{
"created": "Mon, 9 Apr 2012 20:28:52 GMT",
"version": "v1"
}
] |
2012-04-11
|
[
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
We comment on the recent observation of chi_b states by the ATLAS Collaboration and contest their peremptory interpretation of the highest of the three observed structures as the chi_b(3P) system. Moreover, we do not agree that from their data the mass barycenter of the chi_b(3P) system can be determined.
|
2406.01231
|
Marco Chianese Dr
|
Marco Chianese, Satyabrata Datta, Gennaro Miele, Rome Samanta, Ninetta
Saviano
|
Probing flavored regimes of leptogenesis with gravitational waves from
cosmic strings
|
5 pages, 2 figures, plus supplemental material
| null | null | null |
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Cosmic strings radiate detectable gravitational waves in models featuring
high-scale symmetry breaking, e.g., high-scale leptogenesis. In this Letter,
for the first time, we show that different flavored regimes of high-scale
leptogenesis can be tested distinctly with the spectral features in cosmic
string-radiated gravitational waves. This is possible if the scalar field that
makes right-handed neutrinos massive is feebly coupled to the Standard Model
Higgs. Each flavored regime, sensitive to low-energy neutrino experiments,
leaves a marked imprint on the gravitational waves spectrum. A three-flavor and
a two-flavor regime could be probed by a characteristic fall-off of the
gravitational wave spectrum at the LISA-DECIGO-ET frequency bands with
preceding scale-invariant amplitudes bounded from above and below. We present
Gravitational Waves windows for Flavored Regimes of Leptogenesis (GWFRL)
falsifiable in the upcoming experiments.
|
[
{
"created": "Mon, 3 Jun 2024 11:51:23 GMT",
"version": "v1"
}
] |
2024-06-04
|
[
[
"Chianese",
"Marco",
""
],
[
"Datta",
"Satyabrata",
""
],
[
"Miele",
"Gennaro",
""
],
[
"Samanta",
"Rome",
""
],
[
"Saviano",
"Ninetta",
""
]
] |
Cosmic strings radiate detectable gravitational waves in models featuring high-scale symmetry breaking, e.g., high-scale leptogenesis. In this Letter, for the first time, we show that different flavored regimes of high-scale leptogenesis can be tested distinctly with the spectral features in cosmic string-radiated gravitational waves. This is possible if the scalar field that makes right-handed neutrinos massive is feebly coupled to the Standard Model Higgs. Each flavored regime, sensitive to low-energy neutrino experiments, leaves a marked imprint on the gravitational waves spectrum. A three-flavor and a two-flavor regime could be probed by a characteristic fall-off of the gravitational wave spectrum at the LISA-DECIGO-ET frequency bands with preceding scale-invariant amplitudes bounded from above and below. We present Gravitational Waves windows for Flavored Regimes of Leptogenesis (GWFRL) falsifiable in the upcoming experiments.
|
1512.06741
|
Wei Liao
|
Wei Liao and Han-qing Zheng
|
Scalar resonance at 750 GeV as composite of heavy vector-like fermions
|
12 pages, no figure, references updated, version for publication
|
Commun. Theor. Phys. 66 (2016) 219
|
10.1088/0253-6102/66/2/219
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a model of scalars which includes both the SM Higgs and a scalar
singlet as composites of heavy vector-like fermions. The vector-like fermions
are bounded by the super-strong four-fermion interactions. The scalar singlet
decays to SM vector bosons through loop of heavy vector-like fermions. We show
that the surprisingly large production cross section of di-photon events at 750
GeV resonance and the odd decay properties can all be explained. This model
serves as a good model for both SM Higgs and a scalar resonance at 750 GeV.
|
[
{
"created": "Mon, 21 Dec 2015 18:21:32 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Jan 2016 03:10:54 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jul 2016 07:27:01 GMT",
"version": "v3"
}
] |
2016-08-24
|
[
[
"Liao",
"Wei",
""
],
[
"Zheng",
"Han-qing",
""
]
] |
We study a model of scalars which includes both the SM Higgs and a scalar singlet as composites of heavy vector-like fermions. The vector-like fermions are bounded by the super-strong four-fermion interactions. The scalar singlet decays to SM vector bosons through loop of heavy vector-like fermions. We show that the surprisingly large production cross section of di-photon events at 750 GeV resonance and the odd decay properties can all be explained. This model serves as a good model for both SM Higgs and a scalar resonance at 750 GeV.
|
hep-ph/9605265
|
FJ Yndurain
|
F. J. Yndur\'ain
|
On the Theoretical Analysis of the Small $x$ Data in Recent HERA Papers
|
TeX file, 6 pages, no figures
| null | null |
FTUAM 96-19
|
hep-ph
| null |
A number of internal inconsistencies, misleading conclusions and lack of
completeness in the analyses of the small $x$ deep inelastic data in recent
papers of HERA physicists, particularly in a very recent one by the H1
collaboration are pointed out. It is also shown that, when an analysis without
prejudice is carried over, the situation is very different from the one claimed
there in what respects checks of theoretical expectations.
|
[
{
"created": "Thu, 9 May 1996 12:38:43 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ynduráin",
"F. J.",
""
]
] |
A number of internal inconsistencies, misleading conclusions and lack of completeness in the analyses of the small $x$ deep inelastic data in recent papers of HERA physicists, particularly in a very recent one by the H1 collaboration are pointed out. It is also shown that, when an analysis without prejudice is carried over, the situation is very different from the one claimed there in what respects checks of theoretical expectations.
|
0907.1696
|
Yithsbey Giraldo
|
Yithsbey Giraldo, William A. Ponce and Luis A. S\'anchez
|
Stability of the Scalar Potential and Symmetry Breaking in the
Economical 3-3-1 Model
|
to be published in EPJ C, 13 pages
|
Eur.Phys.J.C63:461-475,2009
|
10.1140/epjc/s10052-009-1101-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A detailed study of the criteria for stability of the scalar potential and
the proper electroweak symmetry breaking pattern in the economical 3-3-1 model,
is presented. For the analysis we use, and improve, a method previously
developed to study the scalar potential in the two-Higgs-doublet extension of
the standard model. A new theorem related to the stability of the potential is
stated. As a consequence of this study, the consistency of the economical 3-3-1
model emerges.
|
[
{
"created": "Fri, 10 Jul 2009 00:23:49 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 2009 19:46:34 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Giraldo",
"Yithsbey",
""
],
[
"Ponce",
"William A.",
""
],
[
"Sánchez",
"Luis A.",
""
]
] |
A detailed study of the criteria for stability of the scalar potential and the proper electroweak symmetry breaking pattern in the economical 3-3-1 model, is presented. For the analysis we use, and improve, a method previously developed to study the scalar potential in the two-Higgs-doublet extension of the standard model. A new theorem related to the stability of the potential is stated. As a consequence of this study, the consistency of the economical 3-3-1 model emerges.
|
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