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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0901.2099
|
Omar Gustavo Miranda
|
J. Barranco, A. Bolanos, O. G. Miranda, C. A. Moura, T. I. Rashba
|
Unparticle physics and neutrino phenomenology
|
20 pages, 5 figures. Minor changes, final version
|
Phys.Rev.D79:073011,2009
|
10.1103/PhysRevD.79.073011
|
MPP-2009-3
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have constrained unparticle interactions with neutrinos and electrons
using available data on neutrino-electron elastic scattering and the four CERN
LEP experiments data on mono photon production. We have found that, for
neutrino-electron elastic scattering, the MUNU experiment gives better
constraints than previous reported limits in the region d>1.5. The results are
compared with the current astrophysical limits, pointing out the cases where
these limits may or may not apply. We also discuss the sensitivity of future
experiments to unparticle physics. In particular, we show that the measurement
of coherent reactor neutrino scattering off nuclei could provide a good
sensitivity to the couplings of unparticle interaction with neutrinos and
quarks. We also discuss the case of future neutrino-electron experiments as
well as the International Linear Collider.
|
[
{
"created": "Wed, 14 Jan 2009 19:45:10 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2009 17:09:35 GMT",
"version": "v2"
}
] |
2010-04-14
|
[
[
"Barranco",
"J.",
""
],
[
"Bolanos",
"A.",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Moura",
"C. A.",
""
],
[
"Rashba",
"T. I.",
""
]
] |
We have constrained unparticle interactions with neutrinos and electrons using available data on neutrino-electron elastic scattering and the four CERN LEP experiments data on mono photon production. We have found that, for neutrino-electron elastic scattering, the MUNU experiment gives better constraints than previous reported limits in the region d>1.5. The results are compared with the current astrophysical limits, pointing out the cases where these limits may or may not apply. We also discuss the sensitivity of future experiments to unparticle physics. In particular, we show that the measurement of coherent reactor neutrino scattering off nuclei could provide a good sensitivity to the couplings of unparticle interaction with neutrinos and quarks. We also discuss the case of future neutrino-electron experiments as well as the International Linear Collider.
|
1405.7759
|
C. Q. Geng
|
Chao-Qiang Geng, Da Huang and Lu-Hsing Tsai
|
Cosmic Ray Excesses from Multi-component Dark Matter Decays
|
10 pages, 1 figures, submitted to the special issue of Mod. Phys.
Lett.A "Indirect Dark Matter Searches"
|
Mod. Phys. Lett. A29, 1440003 (2014)
|
10.1142/S0217732314400033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use multi-component decaying dark matter (DM) scenario to explain the
possible cosmic ray excesses in the positron fraction recently confirmed by
AMS-02 and the total $e^+ +e^-$ flux observed by Fermi-LAT. In the
two-component DM models, we find an interesting variation of the flavor
structure along with the cutoff of the heavy DM. For the three-component DM
case, we focus on a particular parameter range in which the best fits prefer to
open only 2 DM decay channels with a third DM contributing nothing to the
electron and positron spectra. We show that all models give the reasonable fits
to both the AMS-02 positron fraction and the Fermi-LAT total $e^++e^-$ flux,
which are also consistent with the measured diffuse $\gamma$-ray flux by
Fermi-LAT.
|
[
{
"created": "Fri, 30 May 2014 01:27:46 GMT",
"version": "v1"
}
] |
2014-12-01
|
[
[
"Geng",
"Chao-Qiang",
""
],
[
"Huang",
"Da",
""
],
[
"Tsai",
"Lu-Hsing",
""
]
] |
We use multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction recently confirmed by AMS-02 and the total $e^+ +e^-$ flux observed by Fermi-LAT. In the two-component DM models, we find an interesting variation of the flavor structure along with the cutoff of the heavy DM. For the three-component DM case, we focus on a particular parameter range in which the best fits prefer to open only 2 DM decay channels with a third DM contributing nothing to the electron and positron spectra. We show that all models give the reasonable fits to both the AMS-02 positron fraction and the Fermi-LAT total $e^++e^-$ flux, which are also consistent with the measured diffuse $\gamma$-ray flux by Fermi-LAT.
|
1706.07606
|
Thomas Neder
|
Ivo de Medeiros Varzielas, Stephen F. King, Christoph Luhn, Thomas
Neder
|
Spontaneous CP violation in multi-Higgs potentials with triplets of
$\Delta(3n^2)$ and $\Delta(6n^2)$
|
57 pages, 4 diagrams
| null |
10.1007/JHEP11(2017)136
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by discrete flavour symmetry models, we analyse Spontaneous CP
Violation (SCPV) for potentials involving three or six Higgs fields (both
electroweak doublets and singlets) which fall into irreducible triplet
representations of discrete symmetries belonging to the $\Delta(3n^2)$ and
$\Delta(6n^2)$ series, including $A_4$, $S_4$, $\Delta(27)$ and $\Delta(54)$.
For each case, we give the potential and find various global mimima for
different regions of the parameter space of the potential. Using CP-odd basis
Invariants that indicate the presence of Spontaneous CP Violation we separate
the VEVs into those that do or do not violate CP. In cases where CP is
preserved we reveal a CP symmetry of the potential that is preserved by those
VEVs, otherwise we display a non-zero CP-odd Invariant. Finally we identify
interesting cases where there is Spontaneous Geometrical CP Violation in which
the VEVs have calculable phases.
|
[
{
"created": "Fri, 23 Jun 2017 09:16:06 GMT",
"version": "v1"
}
] |
2018-01-17
|
[
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"King",
"Stephen F.",
""
],
[
"Luhn",
"Christoph",
""
],
[
"Neder",
"Thomas",
""
]
] |
Motivated by discrete flavour symmetry models, we analyse Spontaneous CP Violation (SCPV) for potentials involving three or six Higgs fields (both electroweak doublets and singlets) which fall into irreducible triplet representations of discrete symmetries belonging to the $\Delta(3n^2)$ and $\Delta(6n^2)$ series, including $A_4$, $S_4$, $\Delta(27)$ and $\Delta(54)$. For each case, we give the potential and find various global mimima for different regions of the parameter space of the potential. Using CP-odd basis Invariants that indicate the presence of Spontaneous CP Violation we separate the VEVs into those that do or do not violate CP. In cases where CP is preserved we reveal a CP symmetry of the potential that is preserved by those VEVs, otherwise we display a non-zero CP-odd Invariant. Finally we identify interesting cases where there is Spontaneous Geometrical CP Violation in which the VEVs have calculable phases.
|
hep-ph/0601267
|
Mustafa Savci
|
T. M. Aliev, M. Savci
|
Analysis of the semileptonic (B_c -> B_u* l+ l-) decay from QCD sum
rules
|
17 pages, no figures, LaTeX formatted
|
Eur.Phys.J.C47:413-421,2006
|
10.1140/epjc/s2006-02579-5
|
metu-phys-hep-06-01
|
hep-ph
| null |
We analyze the semileptonic (B_c -> B_u* l+ l-) decay in the frame work of
the Standard Model. We calculate the (B_c) to (B_u*) transition form factors in
QCD sum rules. Analytical expressions for the spectral densities and gluon
condensates are presented. The branching ratio of the (B_c -> B_u* l+ l-) decay
is calculated, and it is obtained that this decay can be detectable at
forthcoming LHC machines.
|
[
{
"created": "Tue, 31 Jan 2006 15:57:14 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2006 08:13:40 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Aliev",
"T. M.",
""
],
[
"Savci",
"M.",
""
]
] |
We analyze the semileptonic (B_c -> B_u* l+ l-) decay in the frame work of the Standard Model. We calculate the (B_c) to (B_u*) transition form factors in QCD sum rules. Analytical expressions for the spectral densities and gluon condensates are presented. The branching ratio of the (B_c -> B_u* l+ l-) decay is calculated, and it is obtained that this decay can be detectable at forthcoming LHC machines.
|
1012.5778
|
Sarka Todorova PhD
|
\v{S}\'arka Todorova
|
Tuning of the helix string model on the DELPHI $Z^0\rightarrow q\bar{q}$
data
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An alternative model of the fragmentation of the Lund string, investigating
the hypothesis of helix-like ordered gluon field, is compared with hadronic
$Z^0$ data. A significant improvement in the description of various measured
quantities is achieved. In particular, the existence of correlations between
longitudinal and transverse components of hadron momenta (as suggested by the
helix string model) seems to be supported by the data.
|
[
{
"created": "Tue, 28 Dec 2010 15:25:14 GMT",
"version": "v1"
}
] |
2016-08-14
|
[
[
"Todorova",
"Šárka",
""
]
] |
An alternative model of the fragmentation of the Lund string, investigating the hypothesis of helix-like ordered gluon field, is compared with hadronic $Z^0$ data. A significant improvement in the description of various measured quantities is achieved. In particular, the existence of correlations between longitudinal and transverse components of hadron momenta (as suggested by the helix string model) seems to be supported by the data.
|
hep-ph/0508062
|
Joseph Schechter
|
J. Schechter
|
Isobar rescattering model and light scalar mesons
|
10 pages, 3 figures, talk at MRST2005
|
Int.J.Mod.Phys. A20 (2005) 6149-6158
|
10.1142/S0217751X05029174
|
SU-4252-814
|
hep-ph
| null |
We use a toy model to discuss the problem of parameterizing the possible
contribution of a light scalar meson, sigma, to the final state interactions in
the non leptonic decays of heavy mesons.
|
[
{
"created": "Thu, 4 Aug 2005 22:13:05 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Schechter",
"J.",
""
]
] |
We use a toy model to discuss the problem of parameterizing the possible contribution of a light scalar meson, sigma, to the final state interactions in the non leptonic decays of heavy mesons.
|
hep-ph/9811433
|
Gomez Nicola
|
A.Gomez Nicola (U.C.Madrid), V.Galan-Gonzalez (Imperial College)
|
Nonequilibrium chiral perturbation theory and pion decay functions
|
13 pages Latex, 2 figures
|
Phys.Lett. B449 (1999) 288-298
|
10.1016/S0370-2693(99)00067-2
|
FT/UCM-2-98, IMPERIAL/TP/98-99/14
|
hep-ph
| null |
We extend chiral perturbation theory to study a meson gas out of thermal
equilibrium. Assuming that the system is initially in equilibrium below the
critical temperature and working within the Schwinger-Keldysh contour
technique, we define consistently the time-dependent pion decay functions, the
counterparts of the pion decay constants, and calculate them up to next to
leading order. The link with curved space-time QFT allows to establish
nonequilibrium renormalisation. The short-time behaviour and the applicability
to a heavy-ion collision plasma are also discussed in this work.
|
[
{
"created": "Mon, 23 Nov 1998 11:42:35 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Nicola",
"A. Gomez",
"",
"U.C.Madrid"
],
[
"Galan-Gonzalez",
"V.",
"",
"Imperial College"
]
] |
We extend chiral perturbation theory to study a meson gas out of thermal equilibrium. Assuming that the system is initially in equilibrium below the critical temperature and working within the Schwinger-Keldysh contour technique, we define consistently the time-dependent pion decay functions, the counterparts of the pion decay constants, and calculate them up to next to leading order. The link with curved space-time QFT allows to establish nonequilibrium renormalisation. The short-time behaviour and the applicability to a heavy-ion collision plasma are also discussed in this work.
|
2203.07333
|
Sergey Kulagin
|
S.I. Alekhin, S.A. Kulagin, R. Petti
|
Nuclear effects in the deuteron and global QCD analyses
|
30 pages, 14 figures, final version published in PRD
| null |
10.1103/PhysRevD.105.114037
|
INR-TH-2022-007
|
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We report the results of a new global QCD analysis, which includes
deep-inelastic $e/\mu$ scattering data off proton and deuterium, as well as
Drell-Yan lepton pair production in proton-proton and proton-deuterium
collisions and $W^\pm/Z$ boson production data from $pp$ and $p \bar p$
collisions at the LHC and Tevatron. Nuclear effects in the deuteron are treated
in terms of a nuclear convolution approach with bound off-shell nucleons within
a weak binding approximation. The off-shell correction is controlled by a
universal function of the Bjorken variable $x$ describing the modification of
parton distributions in bound nucleons, which is determined in our analysis
along with the parton distribution functions of the proton. A number of
systematic studies are performed to estimate the uncertainties arising from the
use of various deuterium datasets, from the modeling of higher twist
contributions to the structure functions, from the treatment of target mass
corrections, as well as from the nuclear corrections in the deuteron. We obtain
predictions for the ratios $F_2^n/F_2^p$, and $d/u$, focusing on the region of
large $x$. We also compare our results with the ones obtained by other QCD
analyses, as well as with the recent data from the MARATHON experiment.
|
[
{
"created": "Mon, 14 Mar 2022 17:35:27 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2022 11:21:35 GMT",
"version": "v2"
}
] |
2022-07-13
|
[
[
"Alekhin",
"S. I.",
""
],
[
"Kulagin",
"S. A.",
""
],
[
"Petti",
"R.",
""
]
] |
We report the results of a new global QCD analysis, which includes deep-inelastic $e/\mu$ scattering data off proton and deuterium, as well as Drell-Yan lepton pair production in proton-proton and proton-deuterium collisions and $W^\pm/Z$ boson production data from $pp$ and $p \bar p$ collisions at the LHC and Tevatron. Nuclear effects in the deuteron are treated in terms of a nuclear convolution approach with bound off-shell nucleons within a weak binding approximation. The off-shell correction is controlled by a universal function of the Bjorken variable $x$ describing the modification of parton distributions in bound nucleons, which is determined in our analysis along with the parton distribution functions of the proton. A number of systematic studies are performed to estimate the uncertainties arising from the use of various deuterium datasets, from the modeling of higher twist contributions to the structure functions, from the treatment of target mass corrections, as well as from the nuclear corrections in the deuteron. We obtain predictions for the ratios $F_2^n/F_2^p$, and $d/u$, focusing on the region of large $x$. We also compare our results with the ones obtained by other QCD analyses, as well as with the recent data from the MARATHON experiment.
|
hep-ph/0303184
|
Goran Duplancic
|
G. Duplancic, B. Nizic
|
Reduction method for dimensionally regulated one-loop N-point Feynman
integrals
|
22 pages, 2 figures; one appendix added, discussions clarified,
version to appear in Eur. Phys. J. C
|
Eur.Phys.J. C35 (2004) 105-118
|
10.1140/epjc/s2004-01723-7
| null |
hep-ph
| null |
We present a systematic method for reducing an arbitrary one-loop N-point
massless Feynman integral with generic 4-dimensional momenta to a set comprised
of eight fundamental scalar integrals: six box integrals in D=6, a triangle
integral in D=4, and a general two-point integral in D space time dimensions.
All the divergences present in the original integral are contained in the
general two-point integral and associated coefficients. The problem of
vanishing of the kinematic determinants has been solved in an elegant and
transparent manner. Being derived with no restrictions regarding the external
momenta, the method is completely general and applicable for arbitrary
kinematics. In particular, it applies to the integrals in which the set of
external momenta contains subsets comprised of two or more collinear momenta,
which are unavoidable when calculating one-loop contributions to the
hard-scattering amplitude for exclusive hadronic processes at large momentum
transfer in PQCD. The iterative structure makes it easy to implement the
formalism in an algebraic computer program.
|
[
{
"created": "Fri, 21 Mar 2003 16:34:20 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2003 17:44:21 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Feb 2004 15:17:51 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Duplancic",
"G.",
""
],
[
"Nizic",
"B.",
""
]
] |
We present a systematic method for reducing an arbitrary one-loop N-point massless Feynman integral with generic 4-dimensional momenta to a set comprised of eight fundamental scalar integrals: six box integrals in D=6, a triangle integral in D=4, and a general two-point integral in D space time dimensions. All the divergences present in the original integral are contained in the general two-point integral and associated coefficients. The problem of vanishing of the kinematic determinants has been solved in an elegant and transparent manner. Being derived with no restrictions regarding the external momenta, the method is completely general and applicable for arbitrary kinematics. In particular, it applies to the integrals in which the set of external momenta contains subsets comprised of two or more collinear momenta, which are unavoidable when calculating one-loop contributions to the hard-scattering amplitude for exclusive hadronic processes at large momentum transfer in PQCD. The iterative structure makes it easy to implement the formalism in an algebraic computer program.
|
hep-ph/0003174
|
Asesh Krishna Datta
|
Aseshkrishna Datta and Biswarup Mukhopadhyaya
|
Are Messages of R-parity Violating Supersymmetry Hidden within Top Quark
Signals ?
|
13 pages, RevTeX, 2 PS figures, uses epsfig.sty, few comments and
references added, version to appear in Phys. Rev. Lett
|
Phys.Rev.Lett. 85 (2000) 248-251
|
10.1103/PhysRevLett.85.248
|
MRI-PHY/P20000307
|
hep-ph hep-ex
| null |
In an R-parity nonconserving supersymmetric theory, the lighter stop can
dominantly decay into $b\mu$ and $b\tau$ if R-parity breaking has to explain
the neutrino mass and mixing pattern suggested by the data on atmospheric muon
neutrinos. This should give rise to $dilepton+dijet$ and $single-lepton+jets$,
signals resembling those of the top quark at the Fermilab Tevatron. One can
thus constrain the stop parameter space using the current top search data, and
similarly look for the first signals of supersymmetry at the upgraded runs of
the Tevatron.
|
[
{
"created": "Fri, 17 Mar 2000 08:12:24 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jun 2000 19:22:58 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Datta",
"Aseshkrishna",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] |
In an R-parity nonconserving supersymmetric theory, the lighter stop can dominantly decay into $b\mu$ and $b\tau$ if R-parity breaking has to explain the neutrino mass and mixing pattern suggested by the data on atmospheric muon neutrinos. This should give rise to $dilepton+dijet$ and $single-lepton+jets$, signals resembling those of the top quark at the Fermilab Tevatron. One can thus constrain the stop parameter space using the current top search data, and similarly look for the first signals of supersymmetry at the upgraded runs of the Tevatron.
|
1011.1074
|
Harleen Dahiya Dr.
|
Harleen Dahiya and Neetika Sharma
|
Strangeness and Chiral Symmetry Breaking
|
10 pages, 1 table. To appear in Mod. Phys. Lett. A
|
Mod.Phys.Lett.A26:279-288,2011
|
10.1142/S0217732311034785
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The implications of chiral symmetry breaking and SU(3) symmetry breaking have
been studied in the chiral constituent quark model ($\chi$CQM). The role of
hidden strangeness component has been investigated for the scalar matrix
elements of the nucleon with an emphasis on the meson-nucleon sigma terms. The
$\chi$CQM is able to give a qualitative and quantitative description of the
"quark sea" generation through chiral symmetry breaking. The significant
contribution of the strangeness is consistent with the recent available
experimental observations.
|
[
{
"created": "Thu, 4 Nov 2010 08:00:46 GMT",
"version": "v1"
}
] |
2011-02-16
|
[
[
"Dahiya",
"Harleen",
""
],
[
"Sharma",
"Neetika",
""
]
] |
The implications of chiral symmetry breaking and SU(3) symmetry breaking have been studied in the chiral constituent quark model ($\chi$CQM). The role of hidden strangeness component has been investigated for the scalar matrix elements of the nucleon with an emphasis on the meson-nucleon sigma terms. The $\chi$CQM is able to give a qualitative and quantitative description of the "quark sea" generation through chiral symmetry breaking. The significant contribution of the strangeness is consistent with the recent available experimental observations.
|
2005.13067
|
Trevor Reed
|
Trevor Reed, Christopher Leon, Frank Vera, Lei Guo, and Brian Raue
|
The Constituent Counting Rule and Omega Photoproduction
|
6 pages, 8 figures
|
Phys. Rev. C 103, 065203 (2021)
|
10.1103/PhysRevC.103.065203
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The constituent counting ruling (CCR) has been found to hold for numerous
hard, exclusive processes. It predicts the differential cross section at high
energies and fixed $\cos \theta_{c.m.}$ should follow $\frac{d \sigma}{dt} \sim
\frac{1}{s^{n-2}}$, where $n$ is the minimal number of constituents involved in
the reaction. Here we provide an in-depth analysis of the reaction $\gamma p
\rightarrow \omega p$ at $\theta_{c.m.}\sim 90^\circ$ using CLAS data with an
energy range of $s = 5 - 8$ GeV$^2$, where the CCR has been shown to work in
other reactions. We argue for a stringent method to select data to test the CCR
and utilize a Taylor-series expansion to take advantage of data from nearby
angle bins in our analysis. Na\"{i}vely, this reaction would have $n=9$ (or
$n=10$ if the photon is in a $q\bar{q}$ state) and we would expect a scaling of
$\sim s^{-7}$ ($s^{-8}$). Instead, a scaling of $s^{-(9.08 \pm 0.11)}$ was
observed. Explanations for this apparent failure of the na\"{i}ve CCR
assumptions are examined.
|
[
{
"created": "Tue, 26 May 2020 22:19:51 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 2021 21:55:46 GMT",
"version": "v2"
}
] |
2021-06-30
|
[
[
"Reed",
"Trevor",
""
],
[
"Leon",
"Christopher",
""
],
[
"Vera",
"Frank",
""
],
[
"Guo",
"Lei",
""
],
[
"Raue",
"Brian",
""
]
] |
The constituent counting ruling (CCR) has been found to hold for numerous hard, exclusive processes. It predicts the differential cross section at high energies and fixed $\cos \theta_{c.m.}$ should follow $\frac{d \sigma}{dt} \sim \frac{1}{s^{n-2}}$, where $n$ is the minimal number of constituents involved in the reaction. Here we provide an in-depth analysis of the reaction $\gamma p \rightarrow \omega p$ at $\theta_{c.m.}\sim 90^\circ$ using CLAS data with an energy range of $s = 5 - 8$ GeV$^2$, where the CCR has been shown to work in other reactions. We argue for a stringent method to select data to test the CCR and utilize a Taylor-series expansion to take advantage of data from nearby angle bins in our analysis. Na\"{i}vely, this reaction would have $n=9$ (or $n=10$ if the photon is in a $q\bar{q}$ state) and we would expect a scaling of $\sim s^{-7}$ ($s^{-8}$). Instead, a scaling of $s^{-(9.08 \pm 0.11)}$ was observed. Explanations for this apparent failure of the na\"{i}ve CCR assumptions are examined.
|
1506.08464
|
Sanjib Kumar Agarwalla
|
Sanjib Kumar Agarwalla, Yee Kao, Debashis Saha, Tatsu Takeuchi
|
Running of Oscillation Parameters in Matter with Flavor-Diagonal
Non-Standard Interactions of the Neutrino
|
71 pages, 92 pdf figures, 1 table. Slight changes in the title. A new
appendix added comparing numerical probabilities with constant and varying
Earth density profile. New references added. Accepted in JHEP
| null | null |
IP/BBSR/2015-2
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we unravel the role of matter effect in neutrino oscillation
in the presence of lepton-flavor-conserving, non-universal non-standard
interactions (NSI's) of the neutrino. Employing the Jacobi method, we derive
approximate analytical expressions for the effective mass-squared differences
and mixing angles in matter. It is shown that, within the effective mixing
matrix, the Standard Model (SM) W-exchange interaction only affects
$\theta_{12}$ and $\theta_{13}$, while the flavor-diagonal NSI's only affect
$\theta_{23}$. The CP-violating phase $\delta$ remains unaffected. Using our
simple and compact analytical approximation, we study the impact of the
flavor-diagonal NSI's on the neutrino oscillation probabilities for various
appearance and disappearance channels. At higher energies and longer baselines,
it is found that the impact of the NSI's can be significant in the numu to numu
channel, which can probed in future atmospheric neutrino experiments, if the
NSI's are of the order of their current upper bounds. Our analysis also enables
us to explore the possible degeneracy between the octant of $\theta_{23}$ and
the sign of the NSI parameter for a given choice of mass hierarchy in a simple
manner.
|
[
{
"created": "Sun, 28 Jun 2015 22:37:16 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Oct 2015 15:36:00 GMT",
"version": "v2"
}
] |
2015-10-13
|
[
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Kao",
"Yee",
""
],
[
"Saha",
"Debashis",
""
],
[
"Takeuchi",
"Tatsu",
""
]
] |
In this article we unravel the role of matter effect in neutrino oscillation in the presence of lepton-flavor-conserving, non-universal non-standard interactions (NSI's) of the neutrino. Employing the Jacobi method, we derive approximate analytical expressions for the effective mass-squared differences and mixing angles in matter. It is shown that, within the effective mixing matrix, the Standard Model (SM) W-exchange interaction only affects $\theta_{12}$ and $\theta_{13}$, while the flavor-diagonal NSI's only affect $\theta_{23}$. The CP-violating phase $\delta$ remains unaffected. Using our simple and compact analytical approximation, we study the impact of the flavor-diagonal NSI's on the neutrino oscillation probabilities for various appearance and disappearance channels. At higher energies and longer baselines, it is found that the impact of the NSI's can be significant in the numu to numu channel, which can probed in future atmospheric neutrino experiments, if the NSI's are of the order of their current upper bounds. Our analysis also enables us to explore the possible degeneracy between the octant of $\theta_{23}$ and the sign of the NSI parameter for a given choice of mass hierarchy in a simple manner.
|
1911.06254
|
Dorota Sokolowska
|
Dorota Sokolowska, Jan Kalinowski, Jan Klamka, Wojciech Kotlarski,
Pawel Sopicki, Tania Robens, Aleksander Filip Zarnecki
|
Inert Doublet Model signatures at future $e^+e^-$ colliders
|
7 pages, Proceedings for European Physical Society Conference on High
Energy Physics - EPS-HEP2019, 10-17 July, 2019, Ghent, Belgium, based on
1809.07712, 1811.06952. arXiv admin note: text overlap with arXiv:1908.04659
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Inert Doublet Model (IDM) is one of the simplest extensions of the
Standard Model (SM), providing a dark matter candidate. It is a two Higgs
doublet model with a discrete $Z_2$ symmetry, that prevents the scalars of the
second doublet (inert scalars) from coupling to the SM fermions and makes the
lightest of them stable. We study a large group of IDM scenarios, which are
consistent with current constraints on direct detection, including the most
recent bounds from the XENON1T experiment and relic density of dark matter, as
well as with all collider and low-energy limits. We propose a set of benchmark
points with different kinematic features, that promise detectable signals at
future $e^+e^-$ colliders. Two inert scalar pair-production processes are
considered, $e^+e^- \to H^+H^-$ and $e^+e^- \to AH$, followed by decays of
$H^\pm$ and $A$ into final states which include the lightest and stable neutral
scalar dark matter candidate $H$. Significance of the expected observations is
studied for different benchmark models and different running scenarios, for
centre-of-mass energies up to 3 TeV. Numerical results are presented for the
signal signatures with two muons or an electron and a muon in the final state.
For high mass scenarios, when the significance is too low for the leptonic
signatures, the semi-leptonic signature can be used as the discovery channel.
|
[
{
"created": "Sun, 10 Nov 2019 14:40:35 GMT",
"version": "v1"
}
] |
2019-11-15
|
[
[
"Sokolowska",
"Dorota",
""
],
[
"Kalinowski",
"Jan",
""
],
[
"Klamka",
"Jan",
""
],
[
"Kotlarski",
"Wojciech",
""
],
[
"Sopicki",
"Pawel",
""
],
[
"Robens",
"Tania",
""
],
[
"Zarnecki",
"Aleksander Filip",
""
]
] |
The Inert Doublet Model (IDM) is one of the simplest extensions of the Standard Model (SM), providing a dark matter candidate. It is a two Higgs doublet model with a discrete $Z_2$ symmetry, that prevents the scalars of the second doublet (inert scalars) from coupling to the SM fermions and makes the lightest of them stable. We study a large group of IDM scenarios, which are consistent with current constraints on direct detection, including the most recent bounds from the XENON1T experiment and relic density of dark matter, as well as with all collider and low-energy limits. We propose a set of benchmark points with different kinematic features, that promise detectable signals at future $e^+e^-$ colliders. Two inert scalar pair-production processes are considered, $e^+e^- \to H^+H^-$ and $e^+e^- \to AH$, followed by decays of $H^\pm$ and $A$ into final states which include the lightest and stable neutral scalar dark matter candidate $H$. Significance of the expected observations is studied for different benchmark models and different running scenarios, for centre-of-mass energies up to 3 TeV. Numerical results are presented for the signal signatures with two muons or an electron and a muon in the final state. For high mass scenarios, when the significance is too low for the leptonic signatures, the semi-leptonic signature can be used as the discovery channel.
|
0806.4957
|
Adam K. Leibovich
|
Chul Kim and Adam K. Leibovich
|
Leading SU(3) breaking in lightcone distribution amplitudes
|
25 pages, 2 figures
|
Phys.Rev.D78:054026,2008
|
10.1103/PhysRevD.78.054026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lightcone formalism including SU(3) breaking effects for the light
pseudoscalar mesons is studied using soft-collinear effective theory (SCET),
where the conformal symmetries needed for the expansion can be clearly
implemented. The lightcone distribution amplitudes (LCDAs) are well-defined at
each order in the SCET power counting, lambda. Relations between the LCDAs are
reproduced using the SCET formalism. Treating the SU(3) breaking
perturbatively, the leading breaking effects can be described in a simple
manner. As a result, a new relationship among the LCDAs for the light mesons
pi, K, and eta is developed, valid to leading order in the SU(3) breaking.
|
[
{
"created": "Mon, 30 Jun 2008 17:51:46 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kim",
"Chul",
""
],
[
"Leibovich",
"Adam K.",
""
]
] |
The lightcone formalism including SU(3) breaking effects for the light pseudoscalar mesons is studied using soft-collinear effective theory (SCET), where the conformal symmetries needed for the expansion can be clearly implemented. The lightcone distribution amplitudes (LCDAs) are well-defined at each order in the SCET power counting, lambda. Relations between the LCDAs are reproduced using the SCET formalism. Treating the SU(3) breaking perturbatively, the leading breaking effects can be described in a simple manner. As a result, a new relationship among the LCDAs for the light mesons pi, K, and eta is developed, valid to leading order in the SU(3) breaking.
|
hep-ph/9303240
|
Paul Langacker0
|
Paul Langacker
|
Solar Neutrinos
|
19 pages, 2 figures (available on request), Coral Gables talk,
UPR-0552T
| null | null | null |
hep-ph
| null |
The status of solar neutrino experiments and their implications for both
nonstandard astrophysics ({\it e.g.,} cool sun models) and nonstandard neutrino
properties ({\it e.g.,} MSW conversions) are discussed. Assuming that all of
the experiments are correct, the relative rates observed by Kamiokande and
Homestake are hard to account for by a purely astrophysical solution, while MSW
conversions can describe all of the data. Assuming the standard solar model,
there are two allowed regions for MSW conversions into $\nu_\mu$ or $\nu_\tau$,
with the non-adiabatic solution giving a better fit than the large angle. For
conversions into sterile neutrinos there is only a nonadiabatic solution.
Allowing both MSW conversions and nonstandard astrophysics, the data
simultaneously determine the temperature of the core of the sun to within five
percent, consistent with the standard solar model prediction. The implications
of the atmospheric $\nu_\mu/\nu_e$ ratio and of a hot component of the dark
matter are briefly discussed, and the expectations of theoretical models
motivated by grand unification are summarized.
|
[
{
"created": "Wed, 10 Mar 1993 20:03:44 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Langacker",
"Paul",
""
]
] |
The status of solar neutrino experiments and their implications for both nonstandard astrophysics ({\it e.g.,} cool sun models) and nonstandard neutrino properties ({\it e.g.,} MSW conversions) are discussed. Assuming that all of the experiments are correct, the relative rates observed by Kamiokande and Homestake are hard to account for by a purely astrophysical solution, while MSW conversions can describe all of the data. Assuming the standard solar model, there are two allowed regions for MSW conversions into $\nu_\mu$ or $\nu_\tau$, with the non-adiabatic solution giving a better fit than the large angle. For conversions into sterile neutrinos there is only a nonadiabatic solution. Allowing both MSW conversions and nonstandard astrophysics, the data simultaneously determine the temperature of the core of the sun to within five percent, consistent with the standard solar model prediction. The implications of the atmospheric $\nu_\mu/\nu_e$ ratio and of a hot component of the dark matter are briefly discussed, and the expectations of theoretical models motivated by grand unification are summarized.
|
1010.1458
|
Rohini Godbole Professor
|
Rohini M. Godbole, Kumar Rao, Saurabh D. Rindani and Ritesh K. Singh
|
On measurement of top polarization as a probe of $t \bar t$ production
mechanisms at the LHC
|
28 page, LaTeX, requires JHEP style file, 12 figures. Typos corrected
and references added
|
JHEP 1011:144,2010
|
10.1007/JHEP11(2010)144
|
HIP-2010-24/TH
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this note we demonstrate the use of top polarization in the study of $t
\bar t$ resonances at the LHC, in the possible case where the dynamics implies
a non-zero top polarization. As a probe of top polarization we construct an
asymmetry in the decay-lepton azimuthal angle distribution (corresponding to
the sign of $\cos\phi_\ell$) in the laboratory. The asymmetry is non-vanishing
even for a symmetric collider like the LHC, where a positive $z$ axis is not
uniquely defined. The angular distribution of the leptons has the advantage of
being a faithful top-spin analyzer, unaffected by possible anomalous $tbW$
couplings, to linear order. We study, for purposes of demonstration, the case
of a $Z'$ as might exist in the little Higgs models. We identify kinematic cuts
which ensure that our asymmetry reflects the polarization in sign and
magnitude. We investigate possibilities at the LHC with two energy options:
$\sqrt{s} = 14$ TeV and $\sqrt{s} = 7$ TeV, as well as at the Tevatron. At the
LHC the model predicts net top quark polarization of the order of a few per
cent for $M_{Z'} \simeq 1200 $ GeV, being as high as $10 %$ for a smaller mass
of the $Z'$ of $700$ GeV and for the largest allowed coupling in the model, the
values being higher for the $7$ TeV option. These polarizations translate to a
deviation from the standard-model value of azimuthal asymmetry of up to about
$4%$ ($7%$) for $14$ ($7$) TeV LHC, whereas for the Tevatron, values as high as
$12%$ are attained. For the $14$ TeV LHC with an integrated luminosity of 10
fb$^{-1}$, these numbers translate into a $3 \sigma$ sensitivity over a large
part of the range $500 \lesssim M_{Z'} \lesssim 1500 $ GeV.
|
[
{
"created": "Thu, 7 Oct 2010 15:40:14 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Oct 2010 16:47:44 GMT",
"version": "v2"
}
] |
2010-12-09
|
[
[
"Godbole",
"Rohini M.",
""
],
[
"Rao",
"Kumar",
""
],
[
"Rindani",
"Saurabh D.",
""
],
[
"Singh",
"Ritesh K.",
""
]
] |
In this note we demonstrate the use of top polarization in the study of $t \bar t$ resonances at the LHC, in the possible case where the dynamics implies a non-zero top polarization. As a probe of top polarization we construct an asymmetry in the decay-lepton azimuthal angle distribution (corresponding to the sign of $\cos\phi_\ell$) in the laboratory. The asymmetry is non-vanishing even for a symmetric collider like the LHC, where a positive $z$ axis is not uniquely defined. The angular distribution of the leptons has the advantage of being a faithful top-spin analyzer, unaffected by possible anomalous $tbW$ couplings, to linear order. We study, for purposes of demonstration, the case of a $Z'$ as might exist in the little Higgs models. We identify kinematic cuts which ensure that our asymmetry reflects the polarization in sign and magnitude. We investigate possibilities at the LHC with two energy options: $\sqrt{s} = 14$ TeV and $\sqrt{s} = 7$ TeV, as well as at the Tevatron. At the LHC the model predicts net top quark polarization of the order of a few per cent for $M_{Z'} \simeq 1200 $ GeV, being as high as $10 %$ for a smaller mass of the $Z'$ of $700$ GeV and for the largest allowed coupling in the model, the values being higher for the $7$ TeV option. These polarizations translate to a deviation from the standard-model value of azimuthal asymmetry of up to about $4%$ ($7%$) for $14$ ($7$) TeV LHC, whereas for the Tevatron, values as high as $12%$ are attained. For the $14$ TeV LHC with an integrated luminosity of 10 fb$^{-1}$, these numbers translate into a $3 \sigma$ sensitivity over a large part of the range $500 \lesssim M_{Z'} \lesssim 1500 $ GeV.
|
1602.05322
|
Mohammad Moosavi Nejad
|
S. Mohammad Moosavi Nejad, Mahboobe Balali
|
Hadron energy spectrum in polarized top quark decays considering the
effects of hadron and bottom quark masses
| null |
Eur.Phys.J. C76 (2016) no.3, 173
|
10.1140/epjc/s10052-016-4017-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the analytical expressions for the next-to-leading order
corrections to the partial decay width $t(\uparrow) \rightarrow bW^+$, followed
by $b\rightarrow H_bX$, for nonzero b-quark mass ($m_b\neq 0$) in the
fixed-flavor-number scheme (FFNs). To make the predictions for the energy
distribution of outgoing hadrons $H_b$, as a function of the normalized
$H_b$-energy fraction $x_H$, we apply the general-mass variable-flavor-number
scheme (GM-VFNs) in a specific helicity coordinate system where the
polarization of top quark is evaluated relative to the b-quark momentum. We
also study the effects of gluon fragmentation and finite hadron mass on the
hadron energy spectrum so that hadron masses are responsible for the low-$x_H$
threshold. In order to describe both the b-quark and the gluon hadronizations
in top decays we apply realistic and nonperturbative fragmentation functions
extracted through a global fit to $e^+e^-$ annihilation data from CERN LEP1 and
SLAC SLC by relying on their universality and scaling violations.
|
[
{
"created": "Wed, 17 Feb 2016 07:08:11 GMT",
"version": "v1"
}
] |
2016-10-19
|
[
[
"Nejad",
"S. Mohammad Moosavi",
""
],
[
"Balali",
"Mahboobe",
""
]
] |
We present the analytical expressions for the next-to-leading order corrections to the partial decay width $t(\uparrow) \rightarrow bW^+$, followed by $b\rightarrow H_bX$, for nonzero b-quark mass ($m_b\neq 0$) in the fixed-flavor-number scheme (FFNs). To make the predictions for the energy distribution of outgoing hadrons $H_b$, as a function of the normalized $H_b$-energy fraction $x_H$, we apply the general-mass variable-flavor-number scheme (GM-VFNs) in a specific helicity coordinate system where the polarization of top quark is evaluated relative to the b-quark momentum. We also study the effects of gluon fragmentation and finite hadron mass on the hadron energy spectrum so that hadron masses are responsible for the low-$x_H$ threshold. In order to describe both the b-quark and the gluon hadronizations in top decays we apply realistic and nonperturbative fragmentation functions extracted through a global fit to $e^+e^-$ annihilation data from CERN LEP1 and SLAC SLC by relying on their universality and scaling violations.
|
hep-ph/9405431
|
Aneesh V. Manohar
|
Elizabeth Jenkins and Aneesh V. Manohar
|
Baryon Magnetic Moments in the 1/N Expansion
|
(15 pages, 1 figure. Uses harvmac and uufiles), UCSD/PTH 94-10
|
Phys.Lett.B335:452-459,1994
|
10.1016/0370-2693(94)90377-8
| null |
hep-ph
| null |
Relations among the baryon magnetic and transition magnetic moments are
derived in the $1/N_c$ expansion. Relations which hold to ALL ORDERS in $SU(3)$
breaking and to leading and first subleading orders in the $1/N_c$ expansion
are obtained. Additional relations are found which are valid up to $SU(3)$
breaking at first subleading order in the $1/N_c$ expansion. The experimental
accuracy of these relations fits the pattern predicted by the $1/N_c$
expansion. The predictions of the $1/N_c$ expansion are compared in detail with
those of the non-relativistic quark model. The $1/N_c$ expansion explains why
certain quark model relations work to greater accuracy than others.
|
[
{
"created": "Wed, 1 Jun 1994 04:01:03 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Jenkins",
"Elizabeth",
""
],
[
"Manohar",
"Aneesh V.",
""
]
] |
Relations among the baryon magnetic and transition magnetic moments are derived in the $1/N_c$ expansion. Relations which hold to ALL ORDERS in $SU(3)$ breaking and to leading and first subleading orders in the $1/N_c$ expansion are obtained. Additional relations are found which are valid up to $SU(3)$ breaking at first subleading order in the $1/N_c$ expansion. The experimental accuracy of these relations fits the pattern predicted by the $1/N_c$ expansion. The predictions of the $1/N_c$ expansion are compared in detail with those of the non-relativistic quark model. The $1/N_c$ expansion explains why certain quark model relations work to greater accuracy than others.
|
1910.09649
|
Angel Gomez Nicola
|
Angel G\'omez Nicola, Jacobo Ruiz de Elvira, Andrea Vioque-Rodr\'iguez
|
Patterns and partners within the QCD phase diagram including strangeness
|
Proceedings of the Workshop "Strangeness in Quark Matter 2019", 6
pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the current situation of the pattern of chiral symmetry
restoration. In particular, we analyze partner degeneration for $O(4)$ and
$U(1)_A$ symmetries within the context of Ward Identities and Effective
Theories. The application of Ward Identities to the thermal scaling of
screening masses is also discussed. We present relevant observables for which
an Effective Theory description in terms of Chiral Perturbation Theory and its
unitarized extension are compatible with lattice data even around the
transition region. We pay special attention to the role of strangeness in this
context.
|
[
{
"created": "Mon, 21 Oct 2019 20:53:15 GMT",
"version": "v1"
}
] |
2019-10-23
|
[
[
"Nicola",
"Angel Gómez",
""
],
[
"de Elvira",
"Jacobo Ruiz",
""
],
[
"Vioque-Rodríguez",
"Andrea",
""
]
] |
We review the current situation of the pattern of chiral symmetry restoration. In particular, we analyze partner degeneration for $O(4)$ and $U(1)_A$ symmetries within the context of Ward Identities and Effective Theories. The application of Ward Identities to the thermal scaling of screening masses is also discussed. We present relevant observables for which an Effective Theory description in terms of Chiral Perturbation Theory and its unitarized extension are compatible with lattice data even around the transition region. We pay special attention to the role of strangeness in this context.
|
hep-ph/0111147
|
Michael A. Doncheski
|
Stephen Godfrey and M. A. Doncheski
|
Signals for Non-Commutative QED in $e \gamma$ and $\gamma \gamma$
Collisions
|
3 pages, 2 figures, RevTeX 4.0, contributed to APS/DPF/DPB Summer
Study on the Future of Particle Physics (Snowmass 2001), Snowmass, Colorado,
June 30 to July 21, 2001
|
eConf C010630 (2001) P313
| null |
PSMA-001
|
hep-ph
| null |
We study the effects of non-commutative QED (NCQED) in fermion pair
production, $\gamma + \gamma \to f + \bar{f}$ and Compton scattering, $e +
\gamma \to e + \gamma$. Non-commutative geometries appear naturally in the
context of string/M-theory and gives rise to 3- and 4-point photon vertices and
to momentum dependent phase factors in QED vertices which will have observable
effects in high energy collisions. We consider $e^+ e^-$ colliders with
energies appropriate to the TeV Linear Collider proposals and the multi-TeV
CLIC project operating in $\gamma \gamma$ and $e\gamma$ modes. Non-commutative
scales roughly equal to the center of mass energy of the $e^+e^-$ collider can
be probed, with the exact value depending on the model parameters and
experimental factors. However, we found that the Compton process is sensitive
to $\Lambda_{NC}$ values roughly twice as large as those accessible to the pair
production process.
|
[
{
"created": "Mon, 12 Nov 2001 19:40:43 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Godfrey",
"Stephen",
""
],
[
"Doncheski",
"M. A.",
""
]
] |
We study the effects of non-commutative QED (NCQED) in fermion pair production, $\gamma + \gamma \to f + \bar{f}$ and Compton scattering, $e + \gamma \to e + \gamma$. Non-commutative geometries appear naturally in the context of string/M-theory and gives rise to 3- and 4-point photon vertices and to momentum dependent phase factors in QED vertices which will have observable effects in high energy collisions. We consider $e^+ e^-$ colliders with energies appropriate to the TeV Linear Collider proposals and the multi-TeV CLIC project operating in $\gamma \gamma$ and $e\gamma$ modes. Non-commutative scales roughly equal to the center of mass energy of the $e^+e^-$ collider can be probed, with the exact value depending on the model parameters and experimental factors. However, we found that the Compton process is sensitive to $\Lambda_{NC}$ values roughly twice as large as those accessible to the pair production process.
|
2306.15555
|
Filippo Sala
|
Iason Baldes, Maximilian Dichtl, Yann Gouttenoire and Filippo Sala
|
Bubbletrons
|
5 pages plus references, 5 figures
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In cosmological first-order phase transitions (PT) with relativistic bubble
walls, high-energy shells of particles generically form on the inner and outer
sides of the walls. Shells from different bubbles can then collide with
energies much larger than the PT or inflation scales, and with sizeable rates,
realising a `bubbletron'. As an application, we calculate the maximal dark
matter mass $M_{DM}$ that can be produced from shell collisions in a U(1) gauge
PT, for scales of the PT $v_\varphi$ from MeV to $10^{16}$ GeV. We find for
example $M_{DM} \sim 10^6/10^{11}/10^{15}$ GeV for $v_\varphi \sim
10^{-2}/10^3/10^8$ GeV. The gravity wave signal sourced at the PT then links
Pulsar Timing Arrays with the PeV scale, LISA with the ZeV one, and the
Einstein Telescope with grand unification.
|
[
{
"created": "Tue, 27 Jun 2023 15:25:50 GMT",
"version": "v1"
}
] |
2023-06-28
|
[
[
"Baldes",
"Iason",
""
],
[
"Dichtl",
"Maximilian",
""
],
[
"Gouttenoire",
"Yann",
""
],
[
"Sala",
"Filippo",
""
]
] |
In cosmological first-order phase transitions (PT) with relativistic bubble walls, high-energy shells of particles generically form on the inner and outer sides of the walls. Shells from different bubbles can then collide with energies much larger than the PT or inflation scales, and with sizeable rates, realising a `bubbletron'. As an application, we calculate the maximal dark matter mass $M_{DM}$ that can be produced from shell collisions in a U(1) gauge PT, for scales of the PT $v_\varphi$ from MeV to $10^{16}$ GeV. We find for example $M_{DM} \sim 10^6/10^{11}/10^{15}$ GeV for $v_\varphi \sim 10^{-2}/10^3/10^8$ GeV. The gravity wave signal sourced at the PT then links Pulsar Timing Arrays with the PeV scale, LISA with the ZeV one, and the Einstein Telescope with grand unification.
|
1203.1247
|
Hooman Davoudiasl
|
Hooman Davoudiasl (BNL) and Rabindra N. Mohapatra (U. Maryland)
|
On Relating the Genesis of Cosmic Baryons and Dark Matter
|
18 pages, 2 figures. Invited review, to appear in the New Journal of
Physics focus issue on 'Origin of Matter'. New material and a number of
references added in this version
| null |
10.1088/1367-2630/14/9/095011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The similar cosmological energy budgets in visible baryons and dark matter
motivate one to consider a common origin for the generation of both. We outline
the key features of scenarios that can accommodate a unified framework for the
genesis of cosmic matter. In doing so, we provide a brief overview of some of
the past and recent developments and discuss the main predictions of a number
of models.
|
[
{
"created": "Tue, 6 Mar 2012 16:33:49 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2012 18:03:27 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Davoudiasl",
"Hooman",
"",
"BNL"
],
[
"Mohapatra",
"Rabindra N.",
"",
"U. Maryland"
]
] |
The similar cosmological energy budgets in visible baryons and dark matter motivate one to consider a common origin for the generation of both. We outline the key features of scenarios that can accommodate a unified framework for the genesis of cosmic matter. In doing so, we provide a brief overview of some of the past and recent developments and discuss the main predictions of a number of models.
|
hep-ph/0507290
|
Luca Silvestrini
|
M. Ciuchini, M. Pierini, L. Silvestrini
|
The Effect of Penguins in the B_d to J/psi K^0 CP asymmetry
|
4 pages, 3 figures. v2: Numbers updated with BaBar data on B to J/Psi
pi. v3: References added, version published in PRL
|
Phys.Rev.Lett. 95 (2005) 221804
|
10.1103/PhysRevLett.95.221804
| null |
hep-ph
| null |
Performing a fit to the available experimental data, we quantify the effect
of long-distance contributions from penguin contractions in B^0 to J/psi K^0
decays. We estimate the deviation of the measured S_CP term of the
time-dependent CP asymmetry from sin(2 beta) induced by these contributions and
by the penguin operators. We find Delta S = 0.000 +- 0.012 ([-0.025,0.024] @
95% probability).
|
[
{
"created": "Mon, 25 Jul 2005 19:33:25 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2005 22:55:57 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Nov 2005 11:50:14 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Ciuchini",
"M.",
""
],
[
"Pierini",
"M.",
""
],
[
"Silvestrini",
"L.",
""
]
] |
Performing a fit to the available experimental data, we quantify the effect of long-distance contributions from penguin contractions in B^0 to J/psi K^0 decays. We estimate the deviation of the measured S_CP term of the time-dependent CP asymmetry from sin(2 beta) induced by these contributions and by the penguin operators. We find Delta S = 0.000 +- 0.012 ([-0.025,0.024] @ 95% probability).
|
hep-ph/0003127
|
Manuel Drees
|
Manuel Drees (TU Munich)
|
Comment on "A New Dark Matter Candidate: Non-thermal Sterile Neutrinos"
|
Plain LaTeX, 2 pages, no figures
| null | null |
TUM-HEP-369-00
|
hep-ph astro-ph
| null |
I point out that the sterile neutrinos suggested as candidates of "cool" Dark
Matter will decay through their mixing with light neutrinos. This leads to an
upper bound of about 200 keV on the mass of the sterile neutrinos, but might
facilitate their detection.
|
[
{
"created": "Tue, 14 Mar 2000 16:21:18 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Drees",
"Manuel",
"",
"TU Munich"
]
] |
I point out that the sterile neutrinos suggested as candidates of "cool" Dark Matter will decay through their mixing with light neutrinos. This leads to an upper bound of about 200 keV on the mass of the sterile neutrinos, but might facilitate their detection.
|
hep-ph/9303301
|
Cvetic
|
G. Cvetic and C.S. Kim
|
Flavor Democracy in Standard Models at High Energies
|
23 pages (7 Figs. available on request), standard LATEX, preprint
DO-TH 93-08, SNUTP 93-12, YUMS 93-05
|
Nucl.Phys.B407:290-312,1993
|
10.1016/0550-3213(93)90059-X
| null |
hep-ph
| null |
It is possible that the standard model (SM) is replaced around some
transition energy $\E_{tr}$ by a new, possibly Higgsless, ``flavor gauge
theory'' such that the Yukawa (running) parameters of SM at $E \sim \E_{tr}$
show up an (approximate) flavor democracy (FD). We investigate the latter
possibility by studying the renormalization group equations for the Yukawa
couplings of SM with one and two Higgs doublets, by evolving them from given
physical values at low energies ($E \simeq 1 GeV$) to $\E_{tr}$ ($ \sim
\E_{pole}$) and comparing the resulting fermion masses and CKM matrix elements
at $E \simeq \E_{tr}$ for various $m_t^{phy}$ and ratios $v_u/v_d$ of vacuum
expectation values. We find that the minimal SM and the closely related SM with
two Higgs doublets (type I) show increasing deviation from FD when energy is
increased, but that SM with two Higgs doublets (type II) clearly tends to FD
with increasing energy - in both the quark and the leptonic sector (q-q and l-l
FD). Furthermore, we find within the type II model that, for $\E_{pole} \ll
\E_{Planck}$, $m_t^{phy}$ can be less than $200 GeV$ in most cases of chosen
$v_u/v_d$. Under the assumption that also the corresponding Yukawa couplings in
the quark and the leptonic sector at $E \simeq \E_{tr}$ are equal (l-q FD), we
derive estimates of bounds on masses of top quark and tau-neutrino, which are
compatible with experimental bounds.
|
[
{
"created": "Wed, 24 Mar 1993 15:43:44 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Cvetic",
"G.",
""
],
[
"Kim",
"C. S.",
""
]
] |
It is possible that the standard model (SM) is replaced around some transition energy $\E_{tr}$ by a new, possibly Higgsless, ``flavor gauge theory'' such that the Yukawa (running) parameters of SM at $E \sim \E_{tr}$ show up an (approximate) flavor democracy (FD). We investigate the latter possibility by studying the renormalization group equations for the Yukawa couplings of SM with one and two Higgs doublets, by evolving them from given physical values at low energies ($E \simeq 1 GeV$) to $\E_{tr}$ ($ \sim \E_{pole}$) and comparing the resulting fermion masses and CKM matrix elements at $E \simeq \E_{tr}$ for various $m_t^{phy}$ and ratios $v_u/v_d$ of vacuum expectation values. We find that the minimal SM and the closely related SM with two Higgs doublets (type I) show increasing deviation from FD when energy is increased, but that SM with two Higgs doublets (type II) clearly tends to FD with increasing energy - in both the quark and the leptonic sector (q-q and l-l FD). Furthermore, we find within the type II model that, for $\E_{pole} \ll \E_{Planck}$, $m_t^{phy}$ can be less than $200 GeV$ in most cases of chosen $v_u/v_d$. Under the assumption that also the corresponding Yukawa couplings in the quark and the leptonic sector at $E \simeq \E_{tr}$ are equal (l-q FD), we derive estimates of bounds on masses of top quark and tau-neutrino, which are compatible with experimental bounds.
|
2210.10724
|
John M. Campbell
|
John M. Campbell, R. Keith Ellis, Tobias Neumann and Satyajit Seth
|
Transverse momentum resummation at N3LL+NNLO for diboson processes
|
12 pages, 11 figures
|
JHEP 03 (2023) 080
|
10.1007/JHEP03(2023)080
|
FERMILAB-PUB-22-762-T,IPPP/22/72
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Diboson processes are one of the most accessible and stringent probes of the
Standard Model's electroweak gauge structure at the LHC. They will be probed at
the percent level at the high-luminosity LHC, challenging current theory
predictions. We present transverse momentum resummed calculations at N3LL+NNLO
for the processes $ZZ$, $WZ$, $WH$ and $ZH$, compare our predictions with most
recent LHC data and present predictions at 13.6 TeV including theory
uncertainty estimates. For $W^+W^-$ production we further present jet-veto
resummed results at N3LLp+NNLO. Our calculations will be made publicly
available in the upcoming MCFM release and allow future analyses to take
advantage of improved predictions.
|
[
{
"created": "Wed, 19 Oct 2022 17:09:12 GMT",
"version": "v1"
}
] |
2023-05-03
|
[
[
"Campbell",
"John M.",
""
],
[
"Ellis",
"R. Keith",
""
],
[
"Neumann",
"Tobias",
""
],
[
"Seth",
"Satyajit",
""
]
] |
Diboson processes are one of the most accessible and stringent probes of the Standard Model's electroweak gauge structure at the LHC. They will be probed at the percent level at the high-luminosity LHC, challenging current theory predictions. We present transverse momentum resummed calculations at N3LL+NNLO for the processes $ZZ$, $WZ$, $WH$ and $ZH$, compare our predictions with most recent LHC data and present predictions at 13.6 TeV including theory uncertainty estimates. For $W^+W^-$ production we further present jet-veto resummed results at N3LLp+NNLO. Our calculations will be made publicly available in the upcoming MCFM release and allow future analyses to take advantage of improved predictions.
|
0704.1608
|
Krzysztof Golec-Biernat
|
K. Golec-Biernat, A. Luszczak
|
Diffractive parton distributions from the analysis with higher twist
|
24 pages, 12 figures, significant improvements, version to be
published in Phys. Rev. D
|
Phys.Rev.D76:114014,2007
|
10.1103/PhysRevD.76.114014
| null |
hep-ph
| null |
Diffractive parton distributions of the proton are determined from fits to
diffractive data from HERA. In addition to the twist--2 contribution, the
twist--4 contribution from longitudinally polarised virtual photons is
considered, which is important in the region of small diffractive masses. A new
prediction for the longitudinal diffractive structure function is presented
which differs significantly from that obtained in the pure twist--2 analyses.
|
[
{
"created": "Thu, 12 Apr 2007 16:08:52 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2007 14:41:19 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Nov 2007 18:20:00 GMT",
"version": "v3"
}
] |
2010-03-25
|
[
[
"Golec-Biernat",
"K.",
""
],
[
"Luszczak",
"A.",
""
]
] |
Diffractive parton distributions of the proton are determined from fits to diffractive data from HERA. In addition to the twist--2 contribution, the twist--4 contribution from longitudinally polarised virtual photons is considered, which is important in the region of small diffractive masses. A new prediction for the longitudinal diffractive structure function is presented which differs significantly from that obtained in the pure twist--2 analyses.
|
hep-ph/0612309
|
Guey-Lin Lin
|
Guey-Lin Lin (NCTU, NCTS) and Yoshiaki Umeda (NCTU)
|
Probing the octant of $\theta_{23}$ with very long baseline neutrino
oscillation experiments: a global look
|
23 pages, 10 figures, 1 Table, revtex4
| null | null | null |
hep-ph
| null |
We investigate the baseline range in which the $\theta_{23}$ degeneracy in
neutrino oscillation probabilities is absent for fixed values of $\theta_{13}$
and CP violation phase $\delta_{\rm CP}$. We begin by studying sensitivities of
neutrino oscillation probabilities to $\theta_{13}$, $\theta_{23}$ and
$\delta_{\rm CP}$ for very-long-baseline neutrino oscillations. We show contour
graphs of the muon-neutrino survival probability $P(\nu_{\mu}\to \nu_{\mu})$
and the appearance probability $P(\nu_e\to \nu_{\mu})$ on the $\cos
2\theta_{23}-\sin 2\theta_{13}$ plane for baseline lengths $L=1000, 5000, \
10000$, and 12000 km. For each baseline length, it is found that
$P(\nu_{\mu}\to \nu_{\mu})$ is more sensitive to $\sin 2\theta_{13}$ at
energies around its local maximum while it is more sensitive to $\cos
2\theta_{23}$ at energies around its local minimum. On the other hand, the
appearance probability $P(\nu_e\to \nu_{\mu})$ is sensitive to
$\sin2\theta_{13}$ and $\cos2\theta_{23}$ only near its local maximum. We
observe that the $\theta_{23}$ degeneracy in $P(\nu_{\mu}\to \nu_{\mu})$ is
absent at energies around the local maximum of this probability, provided
$\theta_{13}$ is sufficiently large. The $\theta_{23}$ degeneracy is also
absent in general near the local maximum of $P(\nu_e\to \nu_{\mu})$. Using
analytic approximations for neutrino oscillation probabilities, we demonstrate
that the above observations for $L=1000, 5000, 10000, {\rm and} 12000$ km are
in fact valid for all distances. The implications of these results on probing
the octant of $\theta_{23}$ are discussed in details.
|
[
{
"created": "Fri, 22 Dec 2006 17:33:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lin",
"Guey-Lin",
"",
"NCTU, NCTS"
],
[
"Umeda",
"Yoshiaki",
"",
"NCTU"
]
] |
We investigate the baseline range in which the $\theta_{23}$ degeneracy in neutrino oscillation probabilities is absent for fixed values of $\theta_{13}$ and CP violation phase $\delta_{\rm CP}$. We begin by studying sensitivities of neutrino oscillation probabilities to $\theta_{13}$, $\theta_{23}$ and $\delta_{\rm CP}$ for very-long-baseline neutrino oscillations. We show contour graphs of the muon-neutrino survival probability $P(\nu_{\mu}\to \nu_{\mu})$ and the appearance probability $P(\nu_e\to \nu_{\mu})$ on the $\cos 2\theta_{23}-\sin 2\theta_{13}$ plane for baseline lengths $L=1000, 5000, \ 10000$, and 12000 km. For each baseline length, it is found that $P(\nu_{\mu}\to \nu_{\mu})$ is more sensitive to $\sin 2\theta_{13}$ at energies around its local maximum while it is more sensitive to $\cos 2\theta_{23}$ at energies around its local minimum. On the other hand, the appearance probability $P(\nu_e\to \nu_{\mu})$ is sensitive to $\sin2\theta_{13}$ and $\cos2\theta_{23}$ only near its local maximum. We observe that the $\theta_{23}$ degeneracy in $P(\nu_{\mu}\to \nu_{\mu})$ is absent at energies around the local maximum of this probability, provided $\theta_{13}$ is sufficiently large. The $\theta_{23}$ degeneracy is also absent in general near the local maximum of $P(\nu_e\to \nu_{\mu})$. Using analytic approximations for neutrino oscillation probabilities, we demonstrate that the above observations for $L=1000, 5000, 10000, {\rm and} 12000$ km are in fact valid for all distances. The implications of these results on probing the octant of $\theta_{23}$ are discussed in details.
|
0909.5650
|
Francesco Murgia
|
U. D'Alesio (1,2), E. Leader (3,1) and F. Murgia (2) ((1) University
of Cagliari, Italy; (2) INFN, Cagliari, Italy; (3) Imperial College, London,
UK)
|
On the importance of Lorentz structure in the parton model: target mass
corrections, transverse momentum dependence, positivity bounds
|
RevTeX4, 17 pages, 7 eps figures
|
Phys.Rev.D81:036010,2010
|
10.1103/PhysRevD.81.036010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that respecting the underlying Lorentz structure in the parton model
has very strong consequences. Failure to insist on the correct Lorentz
covariance is responsible for the existence of contradictory results in the
literature for the polarized structure function g_2(x), whereas with the
correct imposition we are able to derive the Wandzura-Wilczek relation for
g_2(x) and the target-mass corrections for polarized deep inelastic scattering
without recourse to the operator product expansion. We comment briefly on the
problem of threshold behaviour in the presence of target-mass corrections.
Careful attention to the Lorentz structure has also profound implications for
the structure of the transverse momentum dependent parton densities often used
in parton model treatments of hadron production, allowing the k_T dependence to
be derived explicitly. It also leads to stronger positivity and Soffer-type
bounds than usually utilized for the collinear densities.
|
[
{
"created": "Wed, 30 Sep 2009 16:01:53 GMT",
"version": "v1"
}
] |
2010-04-06
|
[
[
"D'Alesio",
"U.",
""
],
[
"Leader",
"E.",
""
],
[
"Murgia",
"F.",
""
]
] |
We show that respecting the underlying Lorentz structure in the parton model has very strong consequences. Failure to insist on the correct Lorentz covariance is responsible for the existence of contradictory results in the literature for the polarized structure function g_2(x), whereas with the correct imposition we are able to derive the Wandzura-Wilczek relation for g_2(x) and the target-mass corrections for polarized deep inelastic scattering without recourse to the operator product expansion. We comment briefly on the problem of threshold behaviour in the presence of target-mass corrections. Careful attention to the Lorentz structure has also profound implications for the structure of the transverse momentum dependent parton densities often used in parton model treatments of hadron production, allowing the k_T dependence to be derived explicitly. It also leads to stronger positivity and Soffer-type bounds than usually utilized for the collinear densities.
|
1609.00746
|
Luca Mantovani
|
Luca Mantovani and Barbara Pasquini and Xiaonu Xiong and Alessandro
Bacchetta
|
Revisiting the equivalence of light-front and covariant QED in the
light-cone gauge
|
18 pages, 5 figures
|
Phys. Rev. D 94, 116005 (2016)
|
10.1103/PhysRevD.94.116005
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the equivalence between light-front time-ordered-perturbation
theory and covariant quantum field theory in light-front quantization, in the
case of quantum electrodynamics at one-loop level. In particular, we review the
one-loop calculation of the vertex correction, fermion self-energy and vacuum
polarization. We apply the procedure of integration by residue over the
light-front energy in the loop to show how the perturbative expansion in
covariant terms can be reduced to a sum of propagating and instantaneous
diagrams of light-front time-ordered perturbation theory. The detailed proof of
equivalence between the two formulations of the theory resolves the
controversial question on which form should be used for the gauge-field
propagator in the light-cone gauge in the covariant approach.
|
[
{
"created": "Fri, 2 Sep 2016 20:51:28 GMT",
"version": "v1"
}
] |
2016-12-21
|
[
[
"Mantovani",
"Luca",
""
],
[
"Pasquini",
"Barbara",
""
],
[
"Xiong",
"Xiaonu",
""
],
[
"Bacchetta",
"Alessandro",
""
]
] |
We discuss the equivalence between light-front time-ordered-perturbation theory and covariant quantum field theory in light-front quantization, in the case of quantum electrodynamics at one-loop level. In particular, we review the one-loop calculation of the vertex correction, fermion self-energy and vacuum polarization. We apply the procedure of integration by residue over the light-front energy in the loop to show how the perturbative expansion in covariant terms can be reduced to a sum of propagating and instantaneous diagrams of light-front time-ordered perturbation theory. The detailed proof of equivalence between the two formulations of the theory resolves the controversial question on which form should be used for the gauge-field propagator in the light-cone gauge in the covariant approach.
|
1801.10066
|
Chen Zhang
|
Kingman Cheung, Shi-Ping He, Ying-nan Mao, Chen Zhang, Yang Zhou
|
Simplest Little Higgs Revisited: Hidden Mass Relation, Unitarity and
Naturalness
|
35 pages, 7 figures
|
Phys. Rev. D 97, 115001 (2018)
|
10.1103/PhysRevD.97.115001
|
NCTS-PH/1803
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the scalar potential of the Simplest Little Higgs (SLH) model in
an approach consistent with the spirit of continuum effective field theory
(CEFT). By requiring correct electroweak symmetry breaking (EWSB) with the
$125\,\text{GeV}$ Higgs boson, we are able to derive a relation between the
pseudo-axion mass $m_\eta$ and the heavy top mass $m_T$, which serves as a
crucial test of the SLH mechanism. By requiring $m_\eta^2>0$ an upper bound on
$m_T$ can be obtained for any fixed SLH global symmetry breaking scale $f$. We
also point out that an absolute upper bound on $f$ can be obtained by imposing
partial wave unitarity constraint, which in turn leads to absolute upper bounds
of $m_T\lesssim 19\,\text{TeV}, m_\eta\lesssim 1.5\,\text{TeV}$ and
$m_{Z'}\lesssim 48\,\text{TeV}$. We present the allowed region in the
three-dimensional parameter space characterized by $f,t_\beta,m_T$, taking into
account the requirement of valid EWSB and the constraint from perturbative
unitarity. We also propose a strategy of analyzing the fine-tuning problem
consistent with the spirit of CEFT and apply it to the SLH. We suggest that the
scalar potential and fine-tuning analysis strategies adopted here should also
be applicable to a wide class of Little Higgs and Twin Higgs models, which may
reveal interesting relations as crucial tests of the related EWSB mechanism and
provide a new perspective on assessing their degree of fine-tuning.
|
[
{
"created": "Tue, 30 Jan 2018 15:53:25 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2018 12:18:02 GMT",
"version": "v2"
}
] |
2018-09-12
|
[
[
"Cheung",
"Kingman",
""
],
[
"He",
"Shi-Ping",
""
],
[
"Mao",
"Ying-nan",
""
],
[
"Zhang",
"Chen",
""
],
[
"Zhou",
"Yang",
""
]
] |
We analyze the scalar potential of the Simplest Little Higgs (SLH) model in an approach consistent with the spirit of continuum effective field theory (CEFT). By requiring correct electroweak symmetry breaking (EWSB) with the $125\,\text{GeV}$ Higgs boson, we are able to derive a relation between the pseudo-axion mass $m_\eta$ and the heavy top mass $m_T$, which serves as a crucial test of the SLH mechanism. By requiring $m_\eta^2>0$ an upper bound on $m_T$ can be obtained for any fixed SLH global symmetry breaking scale $f$. We also point out that an absolute upper bound on $f$ can be obtained by imposing partial wave unitarity constraint, which in turn leads to absolute upper bounds of $m_T\lesssim 19\,\text{TeV}, m_\eta\lesssim 1.5\,\text{TeV}$ and $m_{Z'}\lesssim 48\,\text{TeV}$. We present the allowed region in the three-dimensional parameter space characterized by $f,t_\beta,m_T$, taking into account the requirement of valid EWSB and the constraint from perturbative unitarity. We also propose a strategy of analyzing the fine-tuning problem consistent with the spirit of CEFT and apply it to the SLH. We suggest that the scalar potential and fine-tuning analysis strategies adopted here should also be applicable to a wide class of Little Higgs and Twin Higgs models, which may reveal interesting relations as crucial tests of the related EWSB mechanism and provide a new perspective on assessing their degree of fine-tuning.
|
hep-ph/9906428
|
Klaus Werner
|
H.J. Drescher, M. Hladik, S. Ostapchenko, K. Werner
|
A New Approach to Nuclear Collisions at RHIC Energies
|
8 pages, 3 figures (proceedings Quark Matter 99)
|
Nucl.Phys. A661 (1999) 604-608
|
10.1016/S0375-9474(99)85098-2
|
SUBATECH 99-06
|
hep-ph
| null |
We present a new parton model approach for nuclear collisions at RHIC
energies (and beyond). It is a selfconsistent treatment, using the same
formalism for calculating cross sections like the total and the inelastic one
and, on the other hand, particle production. Actually, the latter one is based
on an expression for the total cross section, expanded in terms of cut Feynman
diagrams. Dominant diagrams are assumed to be composed of parton ladders
between any pair of nucleons, with ordered virtualities from both ends of the
ladder.
|
[
{
"created": "Fri, 18 Jun 1999 15:01:28 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Drescher",
"H. J.",
""
],
[
"Hladik",
"M.",
""
],
[
"Ostapchenko",
"S.",
""
],
[
"Werner",
"K.",
""
]
] |
We present a new parton model approach for nuclear collisions at RHIC energies (and beyond). It is a selfconsistent treatment, using the same formalism for calculating cross sections like the total and the inelastic one and, on the other hand, particle production. Actually, the latter one is based on an expression for the total cross section, expanded in terms of cut Feynman diagrams. Dominant diagrams are assumed to be composed of parton ladders between any pair of nucleons, with ordered virtualities from both ends of the ladder.
|
hep-ph/0508090
|
Hiroaki Sugiyama
|
H. Sugiyama (KEK, Tsukuba) and O. Yasuda (Tokyo Metropolitan U.)
|
A formula for the sensitivity to sin^2{2theta_13} in reactor experiments
with a spectral analysis
|
23 pages, 5 figures, revtex4
|
Int.J.Mod.Phys.A22:3407-3428,2007
|
10.1142/S0217751X07036993
|
KEK-TH-1033
|
hep-ph
| null |
Using an analytical approach, the sensitivity to sin^2{2theta_13} with
infinite statistics in a spectral analysis is investigated in reactor neutrino
oscillation experiments with one reactor and two identical detectors. We derive
an useful formula for the sensitivity which depends only two parameters
sigma_db/\sqrt{n} (the uncorrelated bin-to-bin systematic error over the
square-root of the number of bins) and sigma_dB (the bin-to-bin correlated
detector specific systematic error).
|
[
{
"created": "Mon, 8 Aug 2005 06:39:12 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Sugiyama",
"H.",
"",
"KEK, Tsukuba"
],
[
"Yasuda",
"O.",
"",
"Tokyo Metropolitan U."
]
] |
Using an analytical approach, the sensitivity to sin^2{2theta_13} with infinite statistics in a spectral analysis is investigated in reactor neutrino oscillation experiments with one reactor and two identical detectors. We derive an useful formula for the sensitivity which depends only two parameters sigma_db/\sqrt{n} (the uncorrelated bin-to-bin systematic error over the square-root of the number of bins) and sigma_dB (the bin-to-bin correlated detector specific systematic error).
|
2408.03378
|
Xiangdong Ji
|
Xiangdong Ji
|
Euclidean Effective Theory for Partons in the Spirit of Steven Weinberg
|
7 page, 1 fig, for Weinberg memorial vol
|
Nucl Phys B, 2024
| null | null |
hep-ph hep-lat hep-th nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The standard formulation of parton physics involves light-cone correlations
of quark and gluon fields in a hadron, which leads to a widespread impression
that it can only be studied through real-time Hamiltonian dynamics or
light-front quantization, which are challenged by non-perturbative computations
with a pertinent regulator for light-cone/rapidity divergences (or zero modes).
As such, standard lattice QCD studies have been limited to indirect parton
observables such as first few moments and short-distance correlations, which do
not provide the $x$-distributions without solving the model-dependent inverse
problem. Here I describe an alternative formulation of partons in terms of
equal-time (or Euclidean) correlators, which allows to compute
precision-controlled $x$-distribution through lattice QCD simulations. This
approach is in accord with Weinberg's pioneering idea of effective field theory
as well as Wilson's renormalization group, in which the large hadron momentum
serves as a natural cut-off for light-cone/rapidity divergences and can
ultimately be eliminated through a method like the ``perfect action'' program
in lattice QCD.
|
[
{
"created": "Tue, 6 Aug 2024 18:01:12 GMT",
"version": "v1"
}
] |
2024-08-08
|
[
[
"Ji",
"Xiangdong",
""
]
] |
The standard formulation of parton physics involves light-cone correlations of quark and gluon fields in a hadron, which leads to a widespread impression that it can only be studied through real-time Hamiltonian dynamics or light-front quantization, which are challenged by non-perturbative computations with a pertinent regulator for light-cone/rapidity divergences (or zero modes). As such, standard lattice QCD studies have been limited to indirect parton observables such as first few moments and short-distance correlations, which do not provide the $x$-distributions without solving the model-dependent inverse problem. Here I describe an alternative formulation of partons in terms of equal-time (or Euclidean) correlators, which allows to compute precision-controlled $x$-distribution through lattice QCD simulations. This approach is in accord with Weinberg's pioneering idea of effective field theory as well as Wilson's renormalization group, in which the large hadron momentum serves as a natural cut-off for light-cone/rapidity divergences and can ultimately be eliminated through a method like the ``perfect action'' program in lattice QCD.
|
2403.08675
|
Wan-Il Park
|
Gabriela Barenboim, Pyungwon Ko, Wan-il Park
|
Axi-majoron for almost everything
|
49 pages, 13 figures; errors corrected, some figures changed
| null | null | null |
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The details of the minimal cosmological standard model (MCSM) proposed in
Ref.~\cite{Barenboim:2024akt} are discussed. The model is based on the
scale-symmetry and the global Peccei-Quinn(PQ) symmetry with a key assumption
that the latter is broken only in the gravity sector in a scale-invariant
manner. We show that the model provides a quite simple unified framework for
the unknown history of the universe from inflation to the epoch of big-bang
nucleosynthesis, simultaneously addressing key puzzles of high energy theory
and cosmology: (i) the origin of scales, (ii) primordial inflation, (iii)
matter-antimatter asymmetry, (iv) tiny neutrino masses, (v) dark matter, and
(vi) the strong CP-problem. Scale symmetry can be exact, and the Planck scale
is dynamically generated. The presence of Gauss-Bonnet term may safely retain
dangerous non-perturbative symmetry-breaking effects negligible, allowing a
large-field trans-Planckian inflation along the PQ-field. Iso-curvature
perturbations of axi-majorons are suppressed. A sizable amount of PQ-number
asymmetry is generated at the end of inflation, and conserved afterwards.
Domain wall problem is absent due to the non-restoration of the symmetry and
the non-zero PQ-number asymmetry. Baryogenesis can be realized by either the
transfer of the PQ-number asymmetry through the seesaw sector, or by resonant
leptogenesis. Dark matter is purely cold axi-majorons from the mis-alignment
contribution with the symmetry-breaking scale of $\mathcal{O}(10^{12}) {\rm
GeV}$. Hot axi-majorons from the decay of the inflaton become a natural source
for a sizable amount of dark radiation. Inflationary gravitational waves have
information about the masse parameters of the lightest left-handed and
right-handed neutrinos, thanks to the presence of an early matter-domination
era driven by the long-lived lightest right-handed neutrino species.
|
[
{
"created": "Wed, 13 Mar 2024 16:30:46 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2024 13:46:35 GMT",
"version": "v2"
}
] |
2024-04-23
|
[
[
"Barenboim",
"Gabriela",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Park",
"Wan-il",
""
]
] |
The details of the minimal cosmological standard model (MCSM) proposed in Ref.~\cite{Barenboim:2024akt} are discussed. The model is based on the scale-symmetry and the global Peccei-Quinn(PQ) symmetry with a key assumption that the latter is broken only in the gravity sector in a scale-invariant manner. We show that the model provides a quite simple unified framework for the unknown history of the universe from inflation to the epoch of big-bang nucleosynthesis, simultaneously addressing key puzzles of high energy theory and cosmology: (i) the origin of scales, (ii) primordial inflation, (iii) matter-antimatter asymmetry, (iv) tiny neutrino masses, (v) dark matter, and (vi) the strong CP-problem. Scale symmetry can be exact, and the Planck scale is dynamically generated. The presence of Gauss-Bonnet term may safely retain dangerous non-perturbative symmetry-breaking effects negligible, allowing a large-field trans-Planckian inflation along the PQ-field. Iso-curvature perturbations of axi-majorons are suppressed. A sizable amount of PQ-number asymmetry is generated at the end of inflation, and conserved afterwards. Domain wall problem is absent due to the non-restoration of the symmetry and the non-zero PQ-number asymmetry. Baryogenesis can be realized by either the transfer of the PQ-number asymmetry through the seesaw sector, or by resonant leptogenesis. Dark matter is purely cold axi-majorons from the mis-alignment contribution with the symmetry-breaking scale of $\mathcal{O}(10^{12}) {\rm GeV}$. Hot axi-majorons from the decay of the inflaton become a natural source for a sizable amount of dark radiation. Inflationary gravitational waves have information about the masse parameters of the lightest left-handed and right-handed neutrinos, thanks to the presence of an early matter-domination era driven by the long-lived lightest right-handed neutrino species.
|
2008.05351
|
Ted Rogers
|
Ted Rogers
|
Transverse moments of TMD parton densities and ultraviolet divergences
|
11 pages, review, version published in Modern Physics Letters A,
Originally prepared for DIS2020, canceled due to the Covid-19 epidemic
| null |
10.1142/S0217732320300219
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review some open questions relating to the large transverse momentum
divergences in transverse moments of transverse momentum dependent (TMD) parton
correlation func- tions. I also explain, in an abbreviated and summarized form,
recent work that shows that the resulting violations of a commonly used
integral relation are not perturbatively suppressed. I argue that this implies
a need for more precise definitions for the correlation functions used to
describe transverse moments.
|
[
{
"created": "Wed, 12 Aug 2020 14:48:22 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Nov 2020 15:38:30 GMT",
"version": "v2"
}
] |
2021-02-03
|
[
[
"Rogers",
"Ted",
""
]
] |
I review some open questions relating to the large transverse momentum divergences in transverse moments of transverse momentum dependent (TMD) parton correlation func- tions. I also explain, in an abbreviated and summarized form, recent work that shows that the resulting violations of a commonly used integral relation are not perturbatively suppressed. I argue that this implies a need for more precise definitions for the correlation functions used to describe transverse moments.
|
1509.08622
|
Mohammad Athar SAJJAD
|
M. Rafi Alam, M. Sajjad Athar, S. Chauhan and S. K. Singh
|
Weak charged and neutral current induced one pion production off the
nucleon
|
24 pages, 13 figures
| null |
10.1142/S0218301316500105
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of neutrino/antineutrino induced charged and neutral
current single pion production off the nucleon. For this, we have considered
$P_{33}(1232)$ resonance, non-resonant background terms, other higher
resonances like $P_{11}(1440)$, $S_{11}(1535)$, $D_{13}(1520)$, $S_{11}(1650)$
and $P_{13}(1720)$. For the non-resonant background terms a microscopic
approach based on SU(2) non-linear sigma model has been used. The vector form
factors for the resonances are obtained by using the relationship between the
electromagnetic resonance form factors and helicity amplitudes provided by
MAID. Axial coupling $C_5^{A}(0)$ in the case of $P_{33}(1232)$ resonance is
obtained by fitting the ANL and BNL $\nu$-deuteron reanalyzed scattering data.
The results are presented with and without deuteron effect for the total
scattering cross sections for all possible channels viz.
$\nu_l(\bar\nu_l)~+~N\rightarrow l^-(l^+)~+~N^\prime~+~\pi^i$;
$\nu_l(\bar\nu_l)~+~N\rightarrow \nu_l(\bar\nu_l)~+~N^\prime~+~\pi^i$, where
$N, N^\prime=p,n$, $\pi^i=~\pi^\pm$ or $\pi^0$ and $l=e, \mu$.
|
[
{
"created": "Tue, 29 Sep 2015 07:55:47 GMT",
"version": "v1"
}
] |
2016-03-23
|
[
[
"Alam",
"M. Rafi",
""
],
[
"Athar",
"M. Sajjad",
""
],
[
"Chauhan",
"S.",
""
],
[
"Singh",
"S. K.",
""
]
] |
We present a study of neutrino/antineutrino induced charged and neutral current single pion production off the nucleon. For this, we have considered $P_{33}(1232)$ resonance, non-resonant background terms, other higher resonances like $P_{11}(1440)$, $S_{11}(1535)$, $D_{13}(1520)$, $S_{11}(1650)$ and $P_{13}(1720)$. For the non-resonant background terms a microscopic approach based on SU(2) non-linear sigma model has been used. The vector form factors for the resonances are obtained by using the relationship between the electromagnetic resonance form factors and helicity amplitudes provided by MAID. Axial coupling $C_5^{A}(0)$ in the case of $P_{33}(1232)$ resonance is obtained by fitting the ANL and BNL $\nu$-deuteron reanalyzed scattering data. The results are presented with and without deuteron effect for the total scattering cross sections for all possible channels viz. $\nu_l(\bar\nu_l)~+~N\rightarrow l^-(l^+)~+~N^\prime~+~\pi^i$; $\nu_l(\bar\nu_l)~+~N\rightarrow \nu_l(\bar\nu_l)~+~N^\prime~+~\pi^i$, where $N, N^\prime=p,n$, $\pi^i=~\pi^\pm$ or $\pi^0$ and $l=e, \mu$.
|
hep-ph/0408319
|
Sannino Francesco
|
S.D.H. Hsu (U Oregon) and F. Sannino (NORDITA)
|
New Solutions to the Strong CP Problem
|
RevTex, 2-columns, 5 pages, 1 fig. Revised version, including
additional discussion of the UV theory and the low-energy effective theory,
to appear in Physics Letters B
|
Phys.Lett. B605 (2005) 369-375
|
10.1016/j.physletb.2004.11.040
| null |
hep-ph hep-th
| null |
We exhibit a solution to the strong CP problem in which ultraviolet physics
renders the QCD theta angle physically unobservable. Our models involve new
strong interactions beyond QCD and particles charged under both the new
interactions and ordinary color.
|
[
{
"created": "Fri, 27 Aug 2004 16:18:44 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2004 13:14:52 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Nov 2004 08:59:26 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Hsu",
"S. D. H.",
"",
"U Oregon"
],
[
"Sannino",
"F.",
"",
"NORDITA"
]
] |
We exhibit a solution to the strong CP problem in which ultraviolet physics renders the QCD theta angle physically unobservable. Our models involve new strong interactions beyond QCD and particles charged under both the new interactions and ordinary color.
|
hep-ph/9908508
|
Maxim Pospelov
|
Maxim Pospelov and Adam Ritz
|
Theta Vacua, QCD Sum Rules, and the Neutron Electric Dipole Moment
|
23 pages, latex; v3: references added; v4: missing overall factor of
two reinstated
|
Nucl.Phys. B573 (2000) 177-200
|
10.1016/S0550-3213(99)00817-2
|
TPI-MINN-99/34, UMN-TH-1808-99
|
hep-ph
| null |
We present a detailed study of the electric dipole moment of the neutron
induced by a vacuum theta angle within the framework of QCD sum rules. At
next-to-next-to leading order in the operator product expansion, we find the
result d_n(\theta) = 2.4 x 10^{-16} \theta e cm, to approximately 40%
precision. With the current experimental bound this translates into a limit on
the theta parameter of |\theta| < 3 x 10^{-10}. We compare this result with the
long-standing estimates obtained within chiral perturbation theory, and observe
a numerical similarity, but also significant differences in the source of the
dominant contribution.
|
[
{
"created": "Mon, 30 Aug 1999 18:48:19 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 1999 01:44:06 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Sep 1999 22:32:18 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Apr 2005 13:49:42 GMT",
"version": "v4"
}
] |
2009-10-31
|
[
[
"Pospelov",
"Maxim",
""
],
[
"Ritz",
"Adam",
""
]
] |
We present a detailed study of the electric dipole moment of the neutron induced by a vacuum theta angle within the framework of QCD sum rules. At next-to-next-to leading order in the operator product expansion, we find the result d_n(\theta) = 2.4 x 10^{-16} \theta e cm, to approximately 40% precision. With the current experimental bound this translates into a limit on the theta parameter of |\theta| < 3 x 10^{-10}. We compare this result with the long-standing estimates obtained within chiral perturbation theory, and observe a numerical similarity, but also significant differences in the source of the dominant contribution.
|
hep-ph/0201039
|
Charles D. Lane
|
Charles D. Lane
|
Atomic Probes of Noncommutative Field Theory
|
5 pages, talk presented at the second meeting on CPT and Lorentz
Symmetry, Bloomington, Indiana, August 2001
| null |
10.1142/9789812778123_0038
| null |
hep-ph
| null |
We consider the role of Lorentz symmetry in noncommutative field theory. We
find that a Lorentz-violating standard-model extension involving ordinary
fields is general enough to include any realisitc noncommutative field theory
as a subset. This leads to various theoretical consequences, as well as bounds
from existing experiments at the level of (10 TeV)$^{-2}$ on the scale of the
noncommutativity parameter.
|
[
{
"created": "Mon, 7 Jan 2002 22:10:39 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Lane",
"Charles D.",
""
]
] |
We consider the role of Lorentz symmetry in noncommutative field theory. We find that a Lorentz-violating standard-model extension involving ordinary fields is general enough to include any realisitc noncommutative field theory as a subset. This leads to various theoretical consequences, as well as bounds from existing experiments at the level of (10 TeV)$^{-2}$ on the scale of the noncommutativity parameter.
|
1109.4972
|
Roman Nevzorov
|
J. P. Hall, S. F. King, R. Nevzorov, S. Pakvasa, M. Sher
|
Nonstandard Higgs Decays and Dark Matter in the E6SSM
|
Parallel talk presented at 2011 Meeting of the Division of Particles
and Fields of the American Physical Society (DPF 2011), Providence, Rhode
Island, USA, 9-13 August 2011, 8 pages
| null | null |
UH511-1177-2011
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the decays of the lightest Higgs boson within the exceptional
supersymmetric (SUSY) standard model (E6SSM). The E6SSM predicts three families
of Higgs-like doublets plus three SM singlets that carry U(1)_{N} charges. One
family of Higgs-like doublets and one SM singlet develop vacuum expectation
values. The fermionic partners of other Higgs-like fields and SM singlets form
inert neutralino and chargino states. Two lightest inert neutralinos tend to be
the lightest and next-to-lightest SUSY particles (LSP and NLSP). The considered
model can account for the dark matter relic abundance if the lightest inert
neutralino has mass close to half the Z mass. In this case the usual SM-like
Higgs boson decays more than 95% of the time into either LSPs or NLSPs. As a
result the decays of the lightest Higgs boson into l^{+} l^{-} + X might play
an essential role in the Higgs searches. This scenario also predicts other
light inert chargino and neutralino states below 200 GeV and large LSP direct
detection cross-sections which is on the edge of observability of XENON100.
|
[
{
"created": "Thu, 22 Sep 2011 23:39:37 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Dec 2011 07:56:25 GMT",
"version": "v2"
}
] |
2011-12-30
|
[
[
"Hall",
"J. P.",
""
],
[
"King",
"S. F.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Pakvasa",
"S.",
""
],
[
"Sher",
"M.",
""
]
] |
We study the decays of the lightest Higgs boson within the exceptional supersymmetric (SUSY) standard model (E6SSM). The E6SSM predicts three families of Higgs-like doublets plus three SM singlets that carry U(1)_{N} charges. One family of Higgs-like doublets and one SM singlet develop vacuum expectation values. The fermionic partners of other Higgs-like fields and SM singlets form inert neutralino and chargino states. Two lightest inert neutralinos tend to be the lightest and next-to-lightest SUSY particles (LSP and NLSP). The considered model can account for the dark matter relic abundance if the lightest inert neutralino has mass close to half the Z mass. In this case the usual SM-like Higgs boson decays more than 95% of the time into either LSPs or NLSPs. As a result the decays of the lightest Higgs boson into l^{+} l^{-} + X might play an essential role in the Higgs searches. This scenario also predicts other light inert chargino and neutralino states below 200 GeV and large LSP direct detection cross-sections which is on the edge of observability of XENON100.
|
0805.4460
|
Kunihiko Terasaki
|
Kunihiko Terasaki
|
Hidden-charm scalar tetra-quark mesons
|
4 pages, 0 figure, references added, typos corrected, description
clarified
|
Prog.Theor.Phys.121:211-216,2009
|
10.1143/PTP.121.211
|
YITP-08-43, KANAZAWA-08-05
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Decays of hidden-charm scalar tetra-quark mesons as the partners of
D_{s0}(2317) which has successfully been assigned to the iso-triplet scalar
tetra-quark [c,n][sbar,nbar]_{I=1} meson are studied. Because OZI-rule allowed
strong decays are kinematically limited, their radiative decays are expected to
be important.
|
[
{
"created": "Thu, 29 May 2008 02:23:24 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 2008 00:57:24 GMT",
"version": "v2"
}
] |
2009-03-12
|
[
[
"Terasaki",
"Kunihiko",
""
]
] |
Decays of hidden-charm scalar tetra-quark mesons as the partners of D_{s0}(2317) which has successfully been assigned to the iso-triplet scalar tetra-quark [c,n][sbar,nbar]_{I=1} meson are studied. Because OZI-rule allowed strong decays are kinematically limited, their radiative decays are expected to be important.
|
1105.5901
|
Alan Cornell
|
S. R. Choudhury, A. S. Cornell and J. D. Roussos
|
Analysis of the lepton polarisation asymmetries of ${\bar B} \to {\bar
K}_2(1430) \, \ell^+ \, \ell^-$ decay
|
13 pages, 10 figures files
| null |
10.1140/epjc/s10052-011-1751-x
|
WITS-CTP-72
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we will study the longitudinal polarisations of both leptons in
the decay process ${\bar B} \to {\bar K}_2(1430)\, \ell^+ \, \ell^-$. This
process has all the features of the related and well investigated process
${\bar B} \to {\bar K}^*(890) \, \ell^+ \, \ell^-$, with theoretically
comparable branching ratios. The polarised differential decay rates as well as
the single and double polarisation asymmetries are worked out, where the
sensitivity of these to possible right-handed couplings for the related $b \to
s$ radiative decay (and other generic BSM parameters) are also investigated.
|
[
{
"created": "Mon, 30 May 2011 08:36:07 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Choudhury",
"S. R.",
""
],
[
"Cornell",
"A. S.",
""
],
[
"Roussos",
"J. D.",
""
]
] |
In this work we will study the longitudinal polarisations of both leptons in the decay process ${\bar B} \to {\bar K}_2(1430)\, \ell^+ \, \ell^-$. This process has all the features of the related and well investigated process ${\bar B} \to {\bar K}^*(890) \, \ell^+ \, \ell^-$, with theoretically comparable branching ratios. The polarised differential decay rates as well as the single and double polarisation asymmetries are worked out, where the sensitivity of these to possible right-handed couplings for the related $b \to s$ radiative decay (and other generic BSM parameters) are also investigated.
|
1705.08486
|
Debjyoti Bardhan
|
Debjyoti Bardhan
|
FCNC Decays of the Top Quark
|
6 pages, 3 figures, Talk presented at the CKM2016, to appear in
Proceedings for the 9th International Workshop on the CKM Unitarity Triangle
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If new physics (e.g. SUSY) does not show up as direct evidence at the LHC, it
could still be observable in FCNC processes involving the $t$-quark. We take a
close look at the process $t\to c + h/Z$ and show that its branching ratio in
the Standard Model is subject to three mechanisms of suppression. To obtain an
observable signal, one needs to evade all these mechanisms in a theory beyond
the Standard Model. We show that a theory like the cMSSM cannot provide a big
enough enhancement. However, in a framework like $R$-parity-violating SUSY,
observable signals are a distinct possibility.
|
[
{
"created": "Tue, 23 May 2017 19:10:47 GMT",
"version": "v1"
}
] |
2017-05-25
|
[
[
"Bardhan",
"Debjyoti",
""
]
] |
If new physics (e.g. SUSY) does not show up as direct evidence at the LHC, it could still be observable in FCNC processes involving the $t$-quark. We take a close look at the process $t\to c + h/Z$ and show that its branching ratio in the Standard Model is subject to three mechanisms of suppression. To obtain an observable signal, one needs to evade all these mechanisms in a theory beyond the Standard Model. We show that a theory like the cMSSM cannot provide a big enough enhancement. However, in a framework like $R$-parity-violating SUSY, observable signals are a distinct possibility.
|
1207.2930
|
Claudio Coriano
|
Claudio Coriano, Luigi Delle Rose, Carlo Marzo, Mirko Serino
|
Higher Order Dilaton Interactions in the Nearly Conformal Limit of the
Standard Model
|
11 pages, 1 Figure. Accepted for publication on Phys. Lett. B
| null |
10.1016/j.physletb.2012.08.054
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the Standard Model in the nearly conformal limit, in which
conformal symmetry is broken only by the dilatation anomaly, through a
hierarchy of anomalous Ward identities for the divergence of its dilatation
current. In this approximation, the identities allow to extract the coupling of
the dilaton to the trace anomaly, which we compute up to the quartic order in
the conformal breaking scale. Our approach can be easily extended to discuss
the anomaly contributions to the dilaton effective action to an arbitrarily
high order. They allow to make a distinction between the Higgs and a dilaton at
a phenomenological level.
|
[
{
"created": "Thu, 12 Jul 2012 11:48:30 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2012 08:26:39 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Coriano",
"Claudio",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Marzo",
"Carlo",
""
],
[
"Serino",
"Mirko",
""
]
] |
We investigate the Standard Model in the nearly conformal limit, in which conformal symmetry is broken only by the dilatation anomaly, through a hierarchy of anomalous Ward identities for the divergence of its dilatation current. In this approximation, the identities allow to extract the coupling of the dilaton to the trace anomaly, which we compute up to the quartic order in the conformal breaking scale. Our approach can be easily extended to discuss the anomaly contributions to the dilaton effective action to an arbitrarily high order. They allow to make a distinction between the Higgs and a dilaton at a phenomenological level.
|
hep-ph/9406327
|
Kazutoshi Ohta
|
K. Ohta and E. Takasugi
|
A New Solution of the Solar Neutrino Flux
|
13 pages and 4 figures (not included), in phyzzx, OU-HET-194
| null |
10.1143/ptp/92.4.733
| null |
hep-ph
| null |
We report a new solution to explain the observed deficit of the solar
neutrino flux by Homestake, Kamiokande II and III, GALLEX and SAGE experiments.
We use the matter mixing and the helicity oscillation in the twisting magnetic
fields in the sun. Our model predicts the short (seasonal) and long (11 years)
time variations of the solar neutrino flux. Three kinds of data observed by
Homestake, Kamiokande, GALLEX and SAGE detectors are reproduced well if the
mixing angle and the squared mass difference are in the small area around
$\sin^2 2\theta \simeq 0.01$ and $\Delta m^2\simeq 1.3\times 10^{-8}{\rm
eV}^2$.
|
[
{
"created": "Thu, 16 Jun 1994 11:37:03 GMT",
"version": "v1"
}
] |
2017-02-01
|
[
[
"Ohta",
"K.",
""
],
[
"Takasugi",
"E.",
""
]
] |
We report a new solution to explain the observed deficit of the solar neutrino flux by Homestake, Kamiokande II and III, GALLEX and SAGE experiments. We use the matter mixing and the helicity oscillation in the twisting magnetic fields in the sun. Our model predicts the short (seasonal) and long (11 years) time variations of the solar neutrino flux. Three kinds of data observed by Homestake, Kamiokande, GALLEX and SAGE detectors are reproduced well if the mixing angle and the squared mass difference are in the small area around $\sin^2 2\theta \simeq 0.01$ and $\Delta m^2\simeq 1.3\times 10^{-8}{\rm eV}^2$.
|
1308.2945
|
Yen-Fu Liu
|
Jiunn-Wei Chen, Yen-Fu Liu, Shi Pu, Yu-Kun Song, Qun Wang
|
Negative Off-Diagonal Conductivities in a Weakly Coupled Quark Gluon
Plasma
|
19 pages, 4 figures
|
Phys. Rev. D 88, 085039 (2013)
|
10.1103/PhysRevD.88.085039
| null |
hep-ph cond-mat.quant-gas cond-mat.stat-mech hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the conductivity matrix of a weakly coupled quark-gluon plasma
at the leading-log order. By setting all quark chemical potentials to be
identical, the diagonal conductivities become degenerate and positive, while
the off-diagonal ones become degenerate but negative (or zero when the chemical
potential vanishes). This means a potential gradient of a certain fermion
flavor can drive backward currents of other flavors. A simple explanation is
provided for this seemingly counter intuitive phenomenon. It is speculated that
this phenomenon is generic and most easily measured in cold atom experiments.
|
[
{
"created": "Tue, 13 Aug 2013 19:08:01 GMT",
"version": "v1"
}
] |
2013-11-13
|
[
[
"Chen",
"Jiunn-Wei",
""
],
[
"Liu",
"Yen-Fu",
""
],
[
"Pu",
"Shi",
""
],
[
"Song",
"Yu-Kun",
""
],
[
"Wang",
"Qun",
""
]
] |
We calculate the conductivity matrix of a weakly coupled quark-gluon plasma at the leading-log order. By setting all quark chemical potentials to be identical, the diagonal conductivities become degenerate and positive, while the off-diagonal ones become degenerate but negative (or zero when the chemical potential vanishes). This means a potential gradient of a certain fermion flavor can drive backward currents of other flavors. A simple explanation is provided for this seemingly counter intuitive phenomenon. It is speculated that this phenomenon is generic and most easily measured in cold atom experiments.
|
2012.02379
|
Zhongyi Li
|
Zhong-Yi Li, Ju-Jun Xie
|
Electromagnetic form factors of $\Sigma^{+}$ and $\Sigma^{-}$ in the
vector meson dominance model
|
5 pages, 5 figures.Accepted for publication in communications in
theoretical physics
| null |
10.1088/1572-9494/abea0f
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Based on the recently measurements of the $e^{+} e^{-} \to \Sigma^{+}
\bar{\Sigma}^{-}$ and $e^{+} e^{-} \to \Sigma^{-} \bar{\Sigma}^{+}$ processes,
the electromagnetic form factors of the hyperon $\Sigma^+$ and $\Sigma^-$ in
the timelike region are investigate by using the vector meson dominance model.
We have included the contributions from the $\rho$, $\omega$ and $\phi$ mesons.
The model parameters are determined with the BESIII experimental data on the
timelike effective form factors $|G_{\rm eff}|$ of $\Sigma^{+}$ and
${\Sigma}^{-}$ for center-of-mass energy from 2.3864 to 3.02 GeV. Then, we
analytically continue the electromagnetic form factors to spacelike region and
evaluate the spacelike form factors of $\Sigma^+$ and $\Sigma^-$. The obtained
electromagnetic form factors of the $\Sigma^+$ and $\Sigma^-$ baryons are
comparable with other model calculations.
|
[
{
"created": "Fri, 4 Dec 2020 03:13:56 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Dec 2020 01:52:58 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Mar 2021 06:33:22 GMT",
"version": "v3"
}
] |
2021-05-26
|
[
[
"Li",
"Zhong-Yi",
""
],
[
"Xie",
"Ju-Jun",
""
]
] |
Based on the recently measurements of the $e^{+} e^{-} \to \Sigma^{+} \bar{\Sigma}^{-}$ and $e^{+} e^{-} \to \Sigma^{-} \bar{\Sigma}^{+}$ processes, the electromagnetic form factors of the hyperon $\Sigma^+$ and $\Sigma^-$ in the timelike region are investigate by using the vector meson dominance model. We have included the contributions from the $\rho$, $\omega$ and $\phi$ mesons. The model parameters are determined with the BESIII experimental data on the timelike effective form factors $|G_{\rm eff}|$ of $\Sigma^{+}$ and ${\Sigma}^{-}$ for center-of-mass energy from 2.3864 to 3.02 GeV. Then, we analytically continue the electromagnetic form factors to spacelike region and evaluate the spacelike form factors of $\Sigma^+$ and $\Sigma^-$. The obtained electromagnetic form factors of the $\Sigma^+$ and $\Sigma^-$ baryons are comparable with other model calculations.
|
1009.5504
|
Yusuke Shimizu
|
Yusuke Shimizu and Ryo Takahashi
|
Deviations from Tri-Bimaximality and Quark-Lepton Complementarity
|
10 pages, 9 figures, final version
|
Europhys.Lett.93:61001,2011
|
10.1209/0295-5075/93/61001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study deviations from tri-bimaximality (TBM) and quark-lepton
complementarity (QLC) in a model independent way. The current neutrino
experimental data is well approximated by tri-bimaximal generation mixing but
the QLC relations are not satisfied with each data of 1$\sigma$ level. This
means that there exist deviations from the complementarity. The same fact for
the TBM might be checked in the future neutrino experiments. We discuss such
deviations from the TBM and QLC, simultaneously. A new ratio between the
deviations is introduced, and some interesting points are presented. We also
show predicted correlations among leptonic mixing angles at the points.
|
[
{
"created": "Tue, 28 Sep 2010 09:44:06 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2010 09:08:51 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Mar 2011 15:52:38 GMT",
"version": "v3"
},
{
"created": "Mon, 2 May 2011 12:24:59 GMT",
"version": "v4"
}
] |
2011-05-03
|
[
[
"Shimizu",
"Yusuke",
""
],
[
"Takahashi",
"Ryo",
""
]
] |
We study deviations from tri-bimaximality (TBM) and quark-lepton complementarity (QLC) in a model independent way. The current neutrino experimental data is well approximated by tri-bimaximal generation mixing but the QLC relations are not satisfied with each data of 1$\sigma$ level. This means that there exist deviations from the complementarity. The same fact for the TBM might be checked in the future neutrino experiments. We discuss such deviations from the TBM and QLC, simultaneously. A new ratio between the deviations is introduced, and some interesting points are presented. We also show predicted correlations among leptonic mixing angles at the points.
|
1810.05826
|
Neelakshi Sarma
|
Neelakshi Sarma, Kalpana Bora and Debasish Borah
|
Compatibility of $A_{4}$ Flavour Symmetric Minimal Extended Seesaw with
$(3+1)$ Neutrino Data
|
46 pages, 8 figures, 21 tables
|
Eur. Phys. J. C, 79 2 (2019) 129
|
10.1140/epjc/s10052-019-6584-z
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the recent resurrection of the evidence for an eV scale sterile
neutrino from the MiniBooNE experiment, we revisit one of the most minimal
seesaw model known as the minimal extended seesaw that gives rise to a $3+1$
light neutrino mass matrix. We consider the presence of $A_4$ flavour symmetry
which plays a non-trivial role in generating the structure of the neutrino mass
matrix. Considering a diagonal charged lepton mass matrix and generic vacuum
alignments of $A_4$ triplet flavons, we classify the resulting mass matrices
based on their textures. Keeping aside the disallowed texture zeros based on
earlier studies of $3+1$ neutrino textures, we categorise the remaining ones
based on texture zeros, $\mu-\tau$ symmetry in the $3\times3$ block and hybrid
textures. After pointing out the origin of such $3+1$ neutrino textures to
$A_4$ vacuum alignments, we use the latest $3+1$ neutrino oscillation data and
numerically analyse the texture zeros and $\mu-\tau$ symmetric cases. We find
that a few of them are allowed from each category predicting interesting
correlations between neutrino parameters. We also find that all of these
allowed cases prefer normal hierarchical pattern of light neutrino masses over
inverted hierarchy.
|
[
{
"created": "Sat, 13 Oct 2018 09:03:43 GMT",
"version": "v1"
}
] |
2019-02-18
|
[
[
"Sarma",
"Neelakshi",
""
],
[
"Bora",
"Kalpana",
""
],
[
"Borah",
"Debasish",
""
]
] |
Motivated by the recent resurrection of the evidence for an eV scale sterile neutrino from the MiniBooNE experiment, we revisit one of the most minimal seesaw model known as the minimal extended seesaw that gives rise to a $3+1$ light neutrino mass matrix. We consider the presence of $A_4$ flavour symmetry which plays a non-trivial role in generating the structure of the neutrino mass matrix. Considering a diagonal charged lepton mass matrix and generic vacuum alignments of $A_4$ triplet flavons, we classify the resulting mass matrices based on their textures. Keeping aside the disallowed texture zeros based on earlier studies of $3+1$ neutrino textures, we categorise the remaining ones based on texture zeros, $\mu-\tau$ symmetry in the $3\times3$ block and hybrid textures. After pointing out the origin of such $3+1$ neutrino textures to $A_4$ vacuum alignments, we use the latest $3+1$ neutrino oscillation data and numerically analyse the texture zeros and $\mu-\tau$ symmetric cases. We find that a few of them are allowed from each category predicting interesting correlations between neutrino parameters. We also find that all of these allowed cases prefer normal hierarchical pattern of light neutrino masses over inverted hierarchy.
|
2206.14212
|
Tom\'a\v{s} Husek
|
Johan Bijnens, Tom\'a\v{s} Husek, Mattias Sj\"o (Lund U.)
|
Six-meson amplitude in QCD-like theories
|
19 pages, 9 figures, 1 table; v2: version accepted for publication in
PRD, minor text improvements
|
Phys. Rev. D 106, 054021 (2022)
|
10.1103/PhysRevD.106.054021
|
LU TP 22-45
|
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the relativistic six-meson scattering amplitude at low energy
within the framework of QCD-like theories with $n$ degenerate quark flavors at
next-to-leading order in the chiral counting. We discuss the cases of complex,
real and pseudo-real representations, i.e. with global symmetry and breaking
patterns $\text{SU}(n)\times\text{SU}(n)/\text{SU}(n)$ (extending the QCD
case), $\text{SU}(2n)/\text{SO}(2n)$, and $\text{SU}(2n)/\text{Sp}(2n)$. In
case of the one-particle-irreducible part, we obtain analytical expressions in
terms of 10 six-meson subamplitudes based on the flavor and group structures.
We extend on our previous results obtained within the framework of the
$\text{O}(N+1)/\text{O}(N)$ non-linear sigma model, with $N$ being the number
of meson flavors. This work allows for studying a number of properties of
six-particle amplitudes at one-loop level.
|
[
{
"created": "Tue, 28 Jun 2022 18:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 15:12:24 GMT",
"version": "v2"
}
] |
2022-09-27
|
[
[
"Bijnens",
"Johan",
"",
"Lund U."
],
[
"Husek",
"Tomáš",
"",
"Lund U."
],
[
"Sjö",
"Mattias",
"",
"Lund U."
]
] |
We calculate the relativistic six-meson scattering amplitude at low energy within the framework of QCD-like theories with $n$ degenerate quark flavors at next-to-leading order in the chiral counting. We discuss the cases of complex, real and pseudo-real representations, i.e. with global symmetry and breaking patterns $\text{SU}(n)\times\text{SU}(n)/\text{SU}(n)$ (extending the QCD case), $\text{SU}(2n)/\text{SO}(2n)$, and $\text{SU}(2n)/\text{Sp}(2n)$. In case of the one-particle-irreducible part, we obtain analytical expressions in terms of 10 six-meson subamplitudes based on the flavor and group structures. We extend on our previous results obtained within the framework of the $\text{O}(N+1)/\text{O}(N)$ non-linear sigma model, with $N$ being the number of meson flavors. This work allows for studying a number of properties of six-particle amplitudes at one-loop level.
|
hep-ph/9710250
|
Silvana Filipponi
|
S.Filipponi(1 and 2), G.Pancheri(3), Y.Srivastava(2 and 4) ((1)Harvard
U.,Cambridge, Mass, USA;(2)INFN-Sezione di Perugia,Italy (3); Laboratori di
Frascati, Italy;(4)Northeastern U., Boston Mass USA)
|
Regge Trajectories For All Flavors
|
11 Pages,1 Table, 4 Figures
|
Phys.Rev.Lett. 80 (1998) 1838-1840
|
10.1103/PhysRevLett.80.1838
|
HUPT/97-A065
|
hep-ph
| null |
Based on available data for mesonic resonances of light, medium and heavy
flavors, we have performed a global analysis to construct the corresponding
linear Regge trajectories. These have been supplemented by results from various
phenomenological models presented in the literature. A satisfactory formula is
found for the dependence of the intercept and the slope on quark masses. We
find reasonable agreement with data on production of charmed hadrons through
exchange of our charmed trajectories in the space-like region. When applied to
mesons containing the top quark, our results suggest the impossibility of their
formation as evidenced by other independent analyses.
|
[
{
"created": "Mon, 6 Oct 1997 13:32:48 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Filipponi",
"S.",
"",
"1 and 2"
],
[
"Pancheri",
"G.",
"",
"2 and 4"
],
[
"Srivastava",
"Y.",
"",
"2 and 4"
]
] |
Based on available data for mesonic resonances of light, medium and heavy flavors, we have performed a global analysis to construct the corresponding linear Regge trajectories. These have been supplemented by results from various phenomenological models presented in the literature. A satisfactory formula is found for the dependence of the intercept and the slope on quark masses. We find reasonable agreement with data on production of charmed hadrons through exchange of our charmed trajectories in the space-like region. When applied to mesons containing the top quark, our results suggest the impossibility of their formation as evidenced by other independent analyses.
|
2201.07199
|
Taoli Cheng
|
Taoli Cheng, Aaron Courville
|
Invariant Representation Driven Neural Classifier for Anti-QCD Jet
Tagging
|
32 pages, 15 figures. To appear in the Journal of High Energy Physics
|
JHEP 10 (2022) 152
|
10.1007/JHEP10(2022)152
| null |
hep-ph cs.LG hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We leverage representation learning and the inductive bias in
neural-net-based Standard Model jet classification tasks, to detect non-QCD
signal jets. In establishing the framework for classification-based anomaly
detection in jet physics, we demonstrate that, with a \emph{well-calibrated}
and \emph{powerful enough feature extractor}, a well-trained
\emph{mass-decorrelated} supervised Standard Model neural jet classifier can
serve as a strong generic anti-QCD jet tagger for effectively reducing the QCD
background. Imposing \emph{data-augmented} mass-invariance (and thus decoupling
the dominant factor) not only facilitates background estimation, but also
induces more substructure-aware representation learning. We are able to reach
excellent tagging efficiencies for all the test signals considered. In the best
case, we reach a background rejection rate of 51 and a significance improvement
factor of 3.6 at 50 \% signal acceptance, with the jet mass decorrelated. This
study indicates that supervised Standard Model jet classifiers have great
potential in general new physics searches.
|
[
{
"created": "Tue, 18 Jan 2022 18:52:56 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2022 07:37:21 GMT",
"version": "v2"
},
{
"created": "Sun, 24 Jul 2022 22:45:23 GMT",
"version": "v3"
},
{
"created": "Thu, 25 Aug 2022 16:56:05 GMT",
"version": "v4"
},
{
"created": "Mon, 17 Oct 2022 10:42:50 GMT",
"version": "v5"
}
] |
2022-10-26
|
[
[
"Cheng",
"Taoli",
""
],
[
"Courville",
"Aaron",
""
]
] |
We leverage representation learning and the inductive bias in neural-net-based Standard Model jet classification tasks, to detect non-QCD signal jets. In establishing the framework for classification-based anomaly detection in jet physics, we demonstrate that, with a \emph{well-calibrated} and \emph{powerful enough feature extractor}, a well-trained \emph{mass-decorrelated} supervised Standard Model neural jet classifier can serve as a strong generic anti-QCD jet tagger for effectively reducing the QCD background. Imposing \emph{data-augmented} mass-invariance (and thus decoupling the dominant factor) not only facilitates background estimation, but also induces more substructure-aware representation learning. We are able to reach excellent tagging efficiencies for all the test signals considered. In the best case, we reach a background rejection rate of 51 and a significance improvement factor of 3.6 at 50 \% signal acceptance, with the jet mass decorrelated. This study indicates that supervised Standard Model jet classifiers have great potential in general new physics searches.
|
2109.03671
|
Rudnei Ramos
|
R. L. S. Farias, Rudnei O. Ramos and D\'erick S. Rosa
|
Symmetry breaking patterns for two coupled complex scalar fields at
finite temperature and in an external magnetic field
|
14 pages, 8 figures. Replaced with version matching the published one
|
Phys. Rev. D 104, 096011 (2021)
|
10.1103/PhysRevD.104.096011
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
A model of two coupled complex scalar fields is studied at finite temperature
and under an external magnetic field. The results are obtained in the context
of the nonperturbative method of the optimized perturbation theory and
contrasted with those obtained in perturbation theory and in the one-loop
approximation. The emergence of phenomena related to inverse symmetry breaking
and symmetry nonrestoration are analyzed.
|
[
{
"created": "Wed, 8 Sep 2021 14:18:17 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 2021 20:04:53 GMT",
"version": "v2"
}
] |
2021-11-19
|
[
[
"Farias",
"R. L. S.",
""
],
[
"Ramos",
"Rudnei O.",
""
],
[
"Rosa",
"Dérick S.",
""
]
] |
A model of two coupled complex scalar fields is studied at finite temperature and under an external magnetic field. The results are obtained in the context of the nonperturbative method of the optimized perturbation theory and contrasted with those obtained in perturbation theory and in the one-loop approximation. The emergence of phenomena related to inverse symmetry breaking and symmetry nonrestoration are analyzed.
|
hep-ph/9909264
|
John LoSecco
|
John M. LoSecco (University of Notre Dame)
|
Atmospheric Neutrinos: Past, Present and
|
10 pages, 6 figures, from Proceedings of the 23rd Johns Hopkins
Workshop "Neutrinos in the Next Millenium"
| null | null |
UND-PDK-99-02
|
hep-ph
| null |
This paper reviews the history of the atmospheric neutrino anomaly. The
historical record does not support more recent claims that the anomaly
constitutes evidence for a neutrino mass. Most experiments have reported an
apparent muon deficiency which is independent of energy and distance. Time
dependent variations in the Super Kamioka results are noted.
|
[
{
"created": "Mon, 6 Sep 1999 15:38:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"LoSecco",
"John M.",
"",
"University of Notre Dame"
]
] |
This paper reviews the history of the atmospheric neutrino anomaly. The historical record does not support more recent claims that the anomaly constitutes evidence for a neutrino mass. Most experiments have reported an apparent muon deficiency which is independent of energy and distance. Time dependent variations in the Super Kamioka results are noted.
|
hep-ph/0305244
|
Nicholas Kersting
|
N. Kersting and Y.L. Ma (Tsinghua U.)
|
Nonsymmetric Gravity and Noncommutative Signals
|
15 pages, 6 figures
| null | null |
TUHEP-TH-03144
|
hep-ph
| null |
Models in which the space-time metric $g_{\mu\nu}$ is not symmetric, $i.e.$
$g_{\mu\nu} \ne g_{\nu\mu}$ may make predictions in scattering experiments, for
example in a future $e^+e^-$ linear collider, similar to those from
noncommutative field theory. We compute the differential cross sections for
pair annihilation, Bhabha and M$\o$ller scattering and find that both
nonsymmetric gravity theory(NGT) and noncommutative field theory predict a
similar dependence of the differential cross section on the azimuthal angle in
agreement with all known data, however in NGT Lorentz violation need not be as
severe. Astrophysical and cosmological tests may prove very useful in
distinguishing these two theories.
|
[
{
"created": "Thu, 22 May 2003 06:42:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kersting",
"N.",
"",
"Tsinghua U."
],
[
"Ma",
"Y. L.",
"",
"Tsinghua U."
]
] |
Models in which the space-time metric $g_{\mu\nu}$ is not symmetric, $i.e.$ $g_{\mu\nu} \ne g_{\nu\mu}$ may make predictions in scattering experiments, for example in a future $e^+e^-$ linear collider, similar to those from noncommutative field theory. We compute the differential cross sections for pair annihilation, Bhabha and M$\o$ller scattering and find that both nonsymmetric gravity theory(NGT) and noncommutative field theory predict a similar dependence of the differential cross section on the azimuthal angle in agreement with all known data, however in NGT Lorentz violation need not be as severe. Astrophysical and cosmological tests may prove very useful in distinguishing these two theories.
|
0807.2301
|
Gary Goldstein
|
Gary R. Goldstein (Tufts U.) and Simonetta Liuti (U. of Virginia)
|
Exclusive Pion-production and the Relation to Transversity
|
4 pages, 2 figures, to appear in the Proceedings of the XVI
International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS
2008), 7-11 April 2008, University College London
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Exclusive $\pi^0$ electroproduction from nucleons is suggested for extracting
the tensor charge and other quantities related to transversity from
experimental data. This process isolates C-parity odd and chiral odd
combinations of t-channel exchange quantum numbers. In a hadronic picture it
connects the meson production amplitudes to C-odd Regge exchanges with final
state interactions. In a description based on partonic degrees of freedom, the
helicity structure for this C-odd process relates to the quark helicity flip,
or chiral odd generalized parton distributions.
|
[
{
"created": "Tue, 15 Jul 2008 05:03:23 GMT",
"version": "v1"
}
] |
2008-07-16
|
[
[
"Goldstein",
"Gary R.",
"",
"Tufts U."
],
[
"Liuti",
"Simonetta",
"",
"U. of Virginia"
]
] |
Exclusive $\pi^0$ electroproduction from nucleons is suggested for extracting the tensor charge and other quantities related to transversity from experimental data. This process isolates C-parity odd and chiral odd combinations of t-channel exchange quantum numbers. In a hadronic picture it connects the meson production amplitudes to C-odd Regge exchanges with final state interactions. In a description based on partonic degrees of freedom, the helicity structure for this C-odd process relates to the quark helicity flip, or chiral odd generalized parton distributions.
|
hep-ph/0306092
|
Chun-Khiang Chua
|
Chun-Khiang Chua
|
Charmless Two-body Baryonic B Decays
|
15 pages, 2 figures. To appear in Phys. Rev. D
|
Phys.Rev. D68 (2003) 074001
|
10.1103/PhysRevD.68.074001
| null |
hep-ph
| null |
We study charmless two-body baryonic B decays in a diagramatic approach.
Relations on decay amplitudes are obtained. In general there are more than one
tree and more than one penguin amplitudes. The number of independent amplitudes
can be reduced in the large m_B limit. It leads to more predictive results.
Some prominent modes for experimental searches are pointed out.
|
[
{
"created": "Wed, 11 Jun 2003 14:12:33 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2003 12:04:06 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Chua",
"Chun-Khiang",
""
]
] |
We study charmless two-body baryonic B decays in a diagramatic approach. Relations on decay amplitudes are obtained. In general there are more than one tree and more than one penguin amplitudes. The number of independent amplitudes can be reduced in the large m_B limit. It leads to more predictive results. Some prominent modes for experimental searches are pointed out.
|
hep-ph/0310320
|
Frieder Kleefeld
|
F. Kleefeld (CFIF, IST, Lisbon, Portugal)
|
The Light and Heavy Scalars in Unitarized Coupled Channel and Lagrangian
Approaches
|
5 pages, 1 figure consisting of 4 eps-files; contribution to the 10th
Int. Conference on "Hadron Spectroscopy" (HADRON '03), Aschaffenburg,
Germany, 31.8.-6.9.2003
|
AIP Conf. Proc. 717 (2004) 332-336
|
10.1063/1.1799727
|
FK-2003-4
|
hep-ph
| null |
Using ideas underlying the flavour-blind "Nijmegen Unitarised Meson Model" we
try to understand on the basis of a system of Schroedinger equations with one
meson-meson and one (spinless) quark-antiquark channel coupled by a simple
delta-shell transition potential the formation of (e.g. scalar) meson-meson
scattering singularities in the complex momentum and energy plane. Surprisingly
we are able to describe without direct meson-meson interaction and without any
need for glueballs the whole known scalar meson spectrum. "Light" scalar mesons
(e.g. f0(600), kappa(800), f0(980), a0(985), D*0(2290), ...) are identified to
belong to the spectrum of the transition potential, while "heavy" scalars (e.g.
f0(1370), K*0(1430), f0(1500), f0(1710), a0(1450), D*0(2621) (?), D*0(2825)
(?), D*sJ(2928) (?), ...) are related to the confinement spectrum. Due to the
particular value of the charm-strange reduced quark mass level-(anti)crossing
in the complex momentum plane occurs which relates the BABAR state Ds(2317) to
the bare groundstate of the confinement spectrum, while the respective
groundstate of the transition potential ends up as D*sJ(2782) (?). We conclude
with a short comment on (our) recent progress in the consistent quantum field
theoretical effective description of resonances within a Lagrangian framework.
|
[
{
"created": "Wed, 29 Oct 2003 18:25:04 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Kleefeld",
"F.",
"",
"CFIF, IST, Lisbon, Portugal"
]
] |
Using ideas underlying the flavour-blind "Nijmegen Unitarised Meson Model" we try to understand on the basis of a system of Schroedinger equations with one meson-meson and one (spinless) quark-antiquark channel coupled by a simple delta-shell transition potential the formation of (e.g. scalar) meson-meson scattering singularities in the complex momentum and energy plane. Surprisingly we are able to describe without direct meson-meson interaction and without any need for glueballs the whole known scalar meson spectrum. "Light" scalar mesons (e.g. f0(600), kappa(800), f0(980), a0(985), D*0(2290), ...) are identified to belong to the spectrum of the transition potential, while "heavy" scalars (e.g. f0(1370), K*0(1430), f0(1500), f0(1710), a0(1450), D*0(2621) (?), D*0(2825) (?), D*sJ(2928) (?), ...) are related to the confinement spectrum. Due to the particular value of the charm-strange reduced quark mass level-(anti)crossing in the complex momentum plane occurs which relates the BABAR state Ds(2317) to the bare groundstate of the confinement spectrum, while the respective groundstate of the transition potential ends up as D*sJ(2782) (?). We conclude with a short comment on (our) recent progress in the consistent quantum field theoretical effective description of resonances within a Lagrangian framework.
|
1702.04139
|
Carlo Giunti Dr.
|
Carlo Giunti
|
Precise Determination of the U-235 Reactor Antineutrino Cross Section
per Fission
|
5 pages; proceedings of AAP 2016 (Applied Antineutrino Physics), 1-2
December 2016, Liverpool, UK
| null | null | null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the possibility that the reactor antineutrino anomaly is due to a
miscalculation of one or more of the $^{235}\text{U}$, $^{238}\text{U}$,
$^{239}\text{Pu}$, and $^{241}\text{Pu}$ reactor antineutrino fluxes. From the
fit of the data we obtain the precise determination $\sigma_{f,235} = ( 6.33
\pm 0.08 ) \times 10^{-43} \, \text{cm}^2 / \text{fission}$ of the
$^{235}\text{U}$ cross section per fission, which is more precise than the
calculated value and differs from it by $2.2\sigma$. The cross sections per
fission of the other fluxes have large uncertainties and in practice their
values are undetermined by the fit. We conclude that it is very likely that at
least the calculation of the $^{235}\text{U}$ flux must be revised.
|
[
{
"created": "Tue, 14 Feb 2017 10:13:27 GMT",
"version": "v1"
}
] |
2017-02-15
|
[
[
"Giunti",
"Carlo",
""
]
] |
We consider the possibility that the reactor antineutrino anomaly is due to a miscalculation of one or more of the $^{235}\text{U}$, $^{238}\text{U}$, $^{239}\text{Pu}$, and $^{241}\text{Pu}$ reactor antineutrino fluxes. From the fit of the data we obtain the precise determination $\sigma_{f,235} = ( 6.33 \pm 0.08 ) \times 10^{-43} \, \text{cm}^2 / \text{fission}$ of the $^{235}\text{U}$ cross section per fission, which is more precise than the calculated value and differs from it by $2.2\sigma$. The cross sections per fission of the other fluxes have large uncertainties and in practice their values are undetermined by the fit. We conclude that it is very likely that at least the calculation of the $^{235}\text{U}$ flux must be revised.
|
1106.5681
|
Chung-I Tan
|
Richard C. Brower, Marko Djuric, Ina Sarcevic and Chung-I Tan
|
The AdS Graviton/Pomeron Description of Deep Inelastic Scattering at
Small x
|
4 pages for the proceedings of the Moriond QCD, 2011
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the holographic or AdS/CFT dual to QCD, the Pomeron is identified with a
Reggeized Graviton in $AdS_5$. We emphasize the importance of confinement,
which in this context corresponds to a deformation of $AdS_5$ geometry in the
IR. The holographic Pomeron provides a very good fit to the combined data from
HERA for Deep Inelastic Scattering at small $x$, lending new confidence to this
AdS dual approach to high energy diffractive scattering.
|
[
{
"created": "Tue, 28 Jun 2011 14:22:43 GMT",
"version": "v1"
}
] |
2011-06-29
|
[
[
"Brower",
"Richard C.",
""
],
[
"Djuric",
"Marko",
""
],
[
"Sarcevic",
"Ina",
""
],
[
"Tan",
"Chung-I",
""
]
] |
In the holographic or AdS/CFT dual to QCD, the Pomeron is identified with a Reggeized Graviton in $AdS_5$. We emphasize the importance of confinement, which in this context corresponds to a deformation of $AdS_5$ geometry in the IR. The holographic Pomeron provides a very good fit to the combined data from HERA for Deep Inelastic Scattering at small $x$, lending new confidence to this AdS dual approach to high energy diffractive scattering.
|
1412.0298
|
Werner Vogelsang
|
Tom Kaufmann, Asmita Mukherjee, Werner Vogelsang
|
Next-to-leading Order Calculation for Jets Defined by a Maximized Jet
Function
|
12 pages, 4 figures. Reference and two figures added; version to
appear in Phys. Rev. D
|
Phys. Rev. D 91, 034001 (2015)
|
10.1103/PhysRevD.91.034001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a next-to-leading order QCD calculation for the single-inclusive
production of collimated jets at hadron colliders, when the jet is defined by
maximizing a suitable jet function that depends on the momenta of final-state
particles in the event. A jet algorithm of this type was initially proposed by
Georgi and subsequently further developed into the class of "$J_{E_T}$
algorithms". Our calculation establishes the infrared safety of the algorithms
at this perturbative order. We derive analytical results for the relevant
partonic cross sections. We discuss similarities and differences with respect
to jets defined by cone or (anti-)$k_t$ algorithms and present numerical
results for the Tevatron and the LHC.
|
[
{
"created": "Sun, 30 Nov 2014 22:31:05 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2015 11:26:32 GMT",
"version": "v2"
}
] |
2015-03-05
|
[
[
"Kaufmann",
"Tom",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Vogelsang",
"Werner",
""
]
] |
We present a next-to-leading order QCD calculation for the single-inclusive production of collimated jets at hadron colliders, when the jet is defined by maximizing a suitable jet function that depends on the momenta of final-state particles in the event. A jet algorithm of this type was initially proposed by Georgi and subsequently further developed into the class of "$J_{E_T}$ algorithms". Our calculation establishes the infrared safety of the algorithms at this perturbative order. We derive analytical results for the relevant partonic cross sections. We discuss similarities and differences with respect to jets defined by cone or (anti-)$k_t$ algorithms and present numerical results for the Tevatron and the LHC.
|
1110.2276
|
Dong Phung Van
|
P. V. Dong, H. N. Long, D. V. Soa, N. H. Thao
|
Photon-radion conversion cross-sections in external electromagnetic
field
|
17 pages, 6 figures, Version published in JHEP
|
JHEP 1110, 018 (2011)
|
10.1007/JHEP10(2011)018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An attempt is made to present some experimental predictions of the
Randall-Sundrum model, where compactification radius of the extra dimension is
stabilized by the radion, which is a scalar field lighter than the graviton
Kaluza-Klein states. We calculate the conversion cross-sections of the photons
into the radions in the external electromagnetic fields, namely, in the static
fields and in a periodic field of the wave guide. Numerical evaluations of the
total cross-sections are also given. Our result shows that the conversion
cross-section in the static electric field is quite small. But, in the static
magnetic and periodic fields, the radion productions are much enhanced.
|
[
{
"created": "Tue, 11 Oct 2011 05:46:17 GMT",
"version": "v1"
}
] |
2011-10-12
|
[
[
"Dong",
"P. V.",
""
],
[
"Long",
"H. N.",
""
],
[
"Soa",
"D. V.",
""
],
[
"Thao",
"N. H.",
""
]
] |
An attempt is made to present some experimental predictions of the Randall-Sundrum model, where compactification radius of the extra dimension is stabilized by the radion, which is a scalar field lighter than the graviton Kaluza-Klein states. We calculate the conversion cross-sections of the photons into the radions in the external electromagnetic fields, namely, in the static fields and in a periodic field of the wave guide. Numerical evaluations of the total cross-sections are also given. Our result shows that the conversion cross-section in the static electric field is quite small. But, in the static magnetic and periodic fields, the radion productions are much enhanced.
|
0911.1018
|
Octavian Micu
|
Sebastian Hollenberg, Octavian Micu, Heinrich P\"as
|
Explaining LSND and MiniBooNE using altered neutrino dispersion
relations
|
3 pages, 1 figure, Proceedings for Erice 2009 Neutrinos in Cosmology,
in Astro-, Particle- and Nuclear Physics
| null |
10.1016/j.ppnp.2009.12.006
|
DO-TH-09/17
|
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
We investigate the possibility to explain the MiniBooNE anomaly by CPT and
Lorentz symmetry violating neutrino-antineutrino oscillations in a two
generation framework. We work with four non-zero CPT-violating parameters that
allow for resonant enhancements in neutrino-antineutrino oscillation phenomena
in vacuo which are suitably described in terms of charge conjugation
eigenstates of the system. We study the relation between the flavor, charge
conjugation and mass eigenbasis of neutrino-antineutrino oscillations and
examine the interplay between the available CPT-violating parameter space and
possible resonance structures.
|
[
{
"created": "Thu, 5 Nov 2009 12:50:00 GMT",
"version": "v1"
}
] |
2015-05-14
|
[
[
"Hollenberg",
"Sebastian",
""
],
[
"Micu",
"Octavian",
""
],
[
"Päs",
"Heinrich",
""
]
] |
We investigate the possibility to explain the MiniBooNE anomaly by CPT and Lorentz symmetry violating neutrino-antineutrino oscillations in a two generation framework. We work with four non-zero CPT-violating parameters that allow for resonant enhancements in neutrino-antineutrino oscillation phenomena in vacuo which are suitably described in terms of charge conjugation eigenstates of the system. We study the relation between the flavor, charge conjugation and mass eigenbasis of neutrino-antineutrino oscillations and examine the interplay between the available CPT-violating parameter space and possible resonance structures.
|
hep-ph/9409362
|
Michael Rueter
|
M. Rueter H.G. Dosch
|
SU(3) Flux Tubes in a Model of the stochastic Vacuum
|
14, epsf, HD-THEP-94-38
|
Z.Phys.C66:245-252,1995
|
10.1007/BF01496598
| null |
hep-ph
| null |
We calculate the squared gluon field strengths of a heavy q-$\rm
\bar{q}$-pair in the model of the stochastic vacuum. We observe that with
increasing separation a chromoelectric flux tube is built. The properties of
the emerging flux tube are investigated.
|
[
{
"created": "Tue, 20 Sep 1994 08:56:29 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 1994 11:32:35 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Dosch",
"M. Rueter H. G.",
""
]
] |
We calculate the squared gluon field strengths of a heavy q-$\rm \bar{q}$-pair in the model of the stochastic vacuum. We observe that with increasing separation a chromoelectric flux tube is built. The properties of the emerging flux tube are investigated.
|
2008.11956
|
Priyotosh Bandyopadhyay
|
Priyotosh Bandyopadhyay, Shilpa Jangid, Manimala Mitra
|
Scrutinizing Vacuum Stability in IDM with Type-III Inverse seesaw
|
38 pages, 32 figures, 1 table, Published version
|
JHEP 02 (2021) 075
|
10.1007/JHEP02(2021)075
|
IITH-PH-0006/20, IP/BBSR/2020-4
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the extension of the Standard Model (SM) with an inert Higgs
doublet that also contains two or three sets of $SU(2)_L$ triplet fermions with
hypercharge zero and analyze the stability of electroweak vacuum for the
scenarios. The model represents a Type-III inverse seesaw mechanism for
neutrino mass generation with a Dark matter candidate.An effective potential
approach calculation with two-loop beta function have been carried out in
deciding the fate of the electroweak vacuum. Weak gauge coupling $g_2$ shows a
different behaviour as compared to the Standard Model. The modified running of
$g_2$, along with the Higgs quartic coupling and Type-III Yukawa couplings
become crucial in determining the stability of electroweak vacuum. The
interplay between two and three generations of such triplet fermions reveals
that extensions with two generations is favoured if we aspire for Planck scale
stability. Bounds on the Higgs quartic couplings, Type-III Yukawa and number of
triplet fermion generations are drawn for different mass scale of Type-III
fermions. The phenomenologies of inert doublet and Type-III fermions at the LHC
and other experiments are commented upon.
|
[
{
"created": "Thu, 27 Aug 2020 07:17:48 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2020 11:36:08 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Feb 2021 04:09:19 GMT",
"version": "v3"
}
] |
2021-02-18
|
[
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Jangid",
"Shilpa",
""
],
[
"Mitra",
"Manimala",
""
]
] |
We consider the extension of the Standard Model (SM) with an inert Higgs doublet that also contains two or three sets of $SU(2)_L$ triplet fermions with hypercharge zero and analyze the stability of electroweak vacuum for the scenarios. The model represents a Type-III inverse seesaw mechanism for neutrino mass generation with a Dark matter candidate.An effective potential approach calculation with two-loop beta function have been carried out in deciding the fate of the electroweak vacuum. Weak gauge coupling $g_2$ shows a different behaviour as compared to the Standard Model. The modified running of $g_2$, along with the Higgs quartic coupling and Type-III Yukawa couplings become crucial in determining the stability of electroweak vacuum. The interplay between two and three generations of such triplet fermions reveals that extensions with two generations is favoured if we aspire for Planck scale stability. Bounds on the Higgs quartic couplings, Type-III Yukawa and number of triplet fermion generations are drawn for different mass scale of Type-III fermions. The phenomenologies of inert doublet and Type-III fermions at the LHC and other experiments are commented upon.
|
2111.14265
|
Bram Verbeek
|
Vittorio Del Duca, Robin Marzucca, Bram Verbeek
|
The gluon Regge trajectory at three loops from planar Yang-Mills theory
|
11 pages
| null |
10.1007/JHEP01(2022)149
|
UUIPT-59/21
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We compute the three-loop leading-colour corrections to the Yang-Mills Regge
trajectory and gluon impact factor. Conjecturing that, in analogy with
$\mathcal{N}=4$ super Yang-Mills (SYM), in a suitable scheme $N_c$-subleading
terms are absent from the three-loop Regge trajectory, we understand our result
as the first computation of the pure gauge, or $n_f = 0$, part of the QCD
three-loop Regge trajectory. The results are presented both for the bare and
renormalised amplitudes and are consistent with predictions from infrared
factorisation along with reproducing known results in planar $\mathcal{N}=4$
SYM through a maximal weight truncation. We also include the dependence on a
Regge factorisation scale to facilitate future applications in BFKL theory at
next-to-next-to leading logarithmic accuracy.
|
[
{
"created": "Sun, 28 Nov 2021 23:02:10 GMT",
"version": "v1"
}
] |
2022-02-16
|
[
[
"Del Duca",
"Vittorio",
""
],
[
"Marzucca",
"Robin",
""
],
[
"Verbeek",
"Bram",
""
]
] |
We compute the three-loop leading-colour corrections to the Yang-Mills Regge trajectory and gluon impact factor. Conjecturing that, in analogy with $\mathcal{N}=4$ super Yang-Mills (SYM), in a suitable scheme $N_c$-subleading terms are absent from the three-loop Regge trajectory, we understand our result as the first computation of the pure gauge, or $n_f = 0$, part of the QCD three-loop Regge trajectory. The results are presented both for the bare and renormalised amplitudes and are consistent with predictions from infrared factorisation along with reproducing known results in planar $\mathcal{N}=4$ SYM through a maximal weight truncation. We also include the dependence on a Regge factorisation scale to facilitate future applications in BFKL theory at next-to-next-to leading logarithmic accuracy.
|
hep-ph/0103053
|
Mauricio B. Magro
|
O. J. P. Eboli (IFUSP, Brazil), M. B. Magro (IFUSP, Brazil), P.
Mathews (IFT, Brazil), P. G. Mercadante (IFUSP, Brazil)
|
Direct Signals for Large Extra Dimensions in the Production of Fermion
Pairs at Linear Colliders
|
19 pages, 5 figures. Using RevTex, axodraw.sty. Discussion was
extended. No changes in the results. Accepted for publication by Phys. Rev. D
|
Phys.Rev. D64 (2001) 035005
|
10.1103/PhysRevD.64.035005
| null |
hep-ph
| null |
We analyze the potentiality of the new generation of $e^+e^-$ linear
colliders to search for large extra dimensions via the production of fermion
pairs in association with Kaluza-Klein gravitons (G), i.e. $e^+e^- \leftarrow
f\bar{f}G$. This process leads to a final state exhibiting a significant amount
of missing energy in addition to acoplanar lepton or jet pairs. We study in
detail this reaction using full tree level contibutions due to the graviton
emission and the standard model backgrounds. After choosing the cuts to enhance
the signal, we show that a linear collider with a center-of-mass energy of 500
GeV will be able to probe quantum gravity scales from 0.96(0.86) up to 4.1(3.3)
TeV at 2(5)$\sigma$ level, depending on the number of extra dimensions.
|
[
{
"created": "Tue, 6 Mar 2001 01:07:43 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2001 14:50:05 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Eboli",
"O. J. P.",
"",
"IFUSP, Brazil"
],
[
"Magro",
"M. B.",
"",
"IFUSP, Brazil"
],
[
"Mathews",
"P.",
"",
"IFT, Brazil"
],
[
"Mercadante",
"P. G.",
"",
"IFUSP, Brazil"
]
] |
We analyze the potentiality of the new generation of $e^+e^-$ linear colliders to search for large extra dimensions via the production of fermion pairs in association with Kaluza-Klein gravitons (G), i.e. $e^+e^- \leftarrow f\bar{f}G$. This process leads to a final state exhibiting a significant amount of missing energy in addition to acoplanar lepton or jet pairs. We study in detail this reaction using full tree level contibutions due to the graviton emission and the standard model backgrounds. After choosing the cuts to enhance the signal, we show that a linear collider with a center-of-mass energy of 500 GeV will be able to probe quantum gravity scales from 0.96(0.86) up to 4.1(3.3) TeV at 2(5)$\sigma$ level, depending on the number of extra dimensions.
|
hep-ph/0402196
|
Esteban Calzetta
|
E. Calzetta
|
The 2 - particle irreducible effective action in gauge theories
|
25 pages
|
Int.J.Theor.Phys. 43 (2004) 767-799
|
10.1023/B:IJTP.0000048174.83795.3f
| null |
hep-ph
| null |
The goal of this paper is to develop the formalism of the two-particle
irreducible (2PI) \cite{LW61} (or Cornwall - Jackiw - Tomboulis (CJT) \cite
{CJT}) effective action (EA) in a way appropiate to its application to non
equilibrium gauge theories. We hope this review article will stimulate new work
into this field.
|
[
{
"created": "Wed, 18 Feb 2004 20:55:32 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Calzetta",
"E.",
""
]
] |
The goal of this paper is to develop the formalism of the two-particle irreducible (2PI) \cite{LW61} (or Cornwall - Jackiw - Tomboulis (CJT) \cite {CJT}) effective action (EA) in a way appropiate to its application to non equilibrium gauge theories. We hope this review article will stimulate new work into this field.
|
1207.0079
|
Nasrallah Nasrallah
|
Nasrallah F. Nasrallah
|
Isospin symmetry breaking and the neutron-proton mass difference
|
Arguments detailed. Two references added. Version to appear in
Physical Review C. DOI:10.1103/PhysRevC.00.005200
| null |
10.1103/PhysRevC.87.055203
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
QCD sum rules using polynomial kernels are used to evaluate the strong part
of the proton-neutron mass difference DeltaM_np in a model independent fashion.
The result for the mass difference turns out to depend sensitively on the value
of the four quark condensate <(qq)^2> and reproduces the experimental value of
DeltaM_np for <(qq)^2>~ 2<qq>^2.
|
[
{
"created": "Sat, 30 Jun 2012 11:15:39 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2013 19:09:00 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Nasrallah",
"Nasrallah F.",
""
]
] |
QCD sum rules using polynomial kernels are used to evaluate the strong part of the proton-neutron mass difference DeltaM_np in a model independent fashion. The result for the mass difference turns out to depend sensitively on the value of the four quark condensate <(qq)^2> and reproduces the experimental value of DeltaM_np for <(qq)^2>~ 2<qq>^2.
|
hep-ph/9909506
|
J. B. Tausk
|
J. B. Tausk
|
Non-planar massless two-loop Feynman diagrams with four on-shell legs
|
Latex, 10 pages; 5 .eps files included with graphicx package
|
Phys.Lett. B469 (1999) 225-234
|
10.1016/S0370-2693(99)01277-0
|
Freiburg-THEP 99/10
|
hep-ph
| null |
The non-planar Feynman diagram with seven massless, scalar propagators and
four on-shell legs (the crossed double box) is calculated analytically in
dimensional regularization. The non-planar diagram with six propagators is also
discussed.
|
[
{
"created": "Fri, 24 Sep 1999 16:59:10 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Tausk",
"J. B.",
""
]
] |
The non-planar Feynman diagram with seven massless, scalar propagators and four on-shell legs (the crossed double box) is calculated analytically in dimensional regularization. The non-planar diagram with six propagators is also discussed.
|
hep-ph/0004164
|
Chao-Qiang Geng\
|
C.Q. Geng, C.C. Lih, and C.C. Liu
|
$K_L\to\gamma\nu\bar{\nu}$ in the Light Front Model
|
11 pages, 2 Figures, LaTex file, accepted for Phys. Rev. D
|
Phys.Rev. D62 (2000) 034019
|
10.1103/PhysRevD.62.034019
| null |
hep-ph
| null |
We study the CP conserving and violating contributions to the decay of
$\knng$ in the standard model. In our analysis, we use the form factors for
$K\to\gamma$ transitions calculated directly in the entire physical range of
momentum transfer within the light front model. We find that the branching
ratios for the CP conserving and violating parts are about $1.0\times 10^{-13}$
and $1.5\times 10^{-15}$, respectively.
|
[
{
"created": "Mon, 17 Apr 2000 13:53:14 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Geng",
"C. Q.",
""
],
[
"Lih",
"C. C.",
""
],
[
"Liu",
"C. C.",
""
]
] |
We study the CP conserving and violating contributions to the decay of $\knng$ in the standard model. In our analysis, we use the form factors for $K\to\gamma$ transitions calculated directly in the entire physical range of momentum transfer within the light front model. We find that the branching ratios for the CP conserving and violating parts are about $1.0\times 10^{-13}$ and $1.5\times 10^{-15}$, respectively.
|
2208.00849
|
Abhishek Roy
|
Genevi\`eve B\'elanger, Sandhya Choubey, Rohini M. Godbole, Sarif
Khan, Manimala Mitra, Abhishek Roy
|
WIMP and FIMP Dark Matter in Singlet-Triplet Fermionic Model
|
52 pages, 26 figures, Published as JHEP11(2022)133
|
JHEP11(2022)133
|
10.1007/JHEP11(2022)133
|
IP/BBSR/2022-05
|
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We present an extension of the SM involving three triplet fermions, one
triplet scalar and one singlet fermion, which can explain both neutrino masses
and dark matter. One triplet of fermions and the singlet are odd under a $Z_2$
symmetry, thus the model features two possible dark matter candidates. The two
remaining $Z_2$-even triplet fermions can reproduce the neutrino masses and
oscillation parameters consistent with observations. We consider the case where
the singlet has feeble couplings while the triplet is weakly interacting and
investigate the different possibilities for reproducing the observed dark
matter relic density. This includes production of the triplet WIMP from
freeze-out and from decay of the singlet as well as freeze-in production of the
singlet from decay of particles that belong to the thermal bath or are
thermally decoupled. While freeze-in production is usually dominated by decay
processes, we also show cases where the annihilation of bath particles give
substantial contribution to the final relic density. This occurs when the new
scalars are below the TeV scale, thus in the reach of the LHC. The
next-to-lightest odd particle can be long-lived and can alter the successful
BBN predictions for the abundance of light elements, these constraints are
relevant in both the scenarios where the singlet or the triplet are the
long-lived particle. In the case where the triplet is the DM, the model is
subject to constraints from ongoing direct, indirect and collider experiments.
When the singlet is the DM, the triplet which is the next-to-lightest odd
particle can be long-lived and can be probed at the proposed MATHUSLA detector.
Finally we also address the detection prospects of triplet fermions and scalars
at the LHC.
|
[
{
"created": "Mon, 1 Aug 2022 13:37:53 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Nov 2022 19:01:49 GMT",
"version": "v2"
}
] |
2022-11-29
|
[
[
"Bélanger",
"Geneviève",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Godbole",
"Rohini M.",
""
],
[
"Khan",
"Sarif",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Roy",
"Abhishek",
""
]
] |
We present an extension of the SM involving three triplet fermions, one triplet scalar and one singlet fermion, which can explain both neutrino masses and dark matter. One triplet of fermions and the singlet are odd under a $Z_2$ symmetry, thus the model features two possible dark matter candidates. The two remaining $Z_2$-even triplet fermions can reproduce the neutrino masses and oscillation parameters consistent with observations. We consider the case where the singlet has feeble couplings while the triplet is weakly interacting and investigate the different possibilities for reproducing the observed dark matter relic density. This includes production of the triplet WIMP from freeze-out and from decay of the singlet as well as freeze-in production of the singlet from decay of particles that belong to the thermal bath or are thermally decoupled. While freeze-in production is usually dominated by decay processes, we also show cases where the annihilation of bath particles give substantial contribution to the final relic density. This occurs when the new scalars are below the TeV scale, thus in the reach of the LHC. The next-to-lightest odd particle can be long-lived and can alter the successful BBN predictions for the abundance of light elements, these constraints are relevant in both the scenarios where the singlet or the triplet are the long-lived particle. In the case where the triplet is the DM, the model is subject to constraints from ongoing direct, indirect and collider experiments. When the singlet is the DM, the triplet which is the next-to-lightest odd particle can be long-lived and can be probed at the proposed MATHUSLA detector. Finally we also address the detection prospects of triplet fermions and scalars at the LHC.
|
1301.5111
|
Emanuele Di Palma
|
G. Dattoli and E. Di Palma
|
The exponential parameterization of the quark mixing matrix
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
We comment on the exponential parameterization of the quark mixing matrix, by
stressing that it naturally incorporates the Cabibbo structure and the
hierarchical features of the Wolfenstein form. We extend our results to the
neutrino mixing and introduce an exponential generator of the tribimaximal
matrix.
|
[
{
"created": "Tue, 22 Jan 2013 08:56:28 GMT",
"version": "v1"
}
] |
2013-01-23
|
[
[
"Dattoli",
"G.",
""
],
[
"Di Palma",
"E.",
""
]
] |
We comment on the exponential parameterization of the quark mixing matrix, by stressing that it naturally incorporates the Cabibbo structure and the hierarchical features of the Wolfenstein form. We extend our results to the neutrino mixing and introduce an exponential generator of the tribimaximal matrix.
|
1009.5865
|
Christoph Weniger
|
Christoph Weniger
|
Supersymmetric leptogenesis and light hidden sectors
|
6 pages, 3 figures, Talk presented at PASCOS, Valencia, 19-23 July
2010
|
J.Phys.Conf.Ser.259:012075,2010
|
10.1088/1742-6596/259/1/012075
|
DESY 10-162
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Thermal leptogenesis and supergravity are attractive scenarios for physics
beyond the standard model. However, it is well known that the super-weak
interaction of the gravitino often leads to problems with primordial
nucleosynthesis in the standard scenario of matter parity conserving MSSM +
three right-handed neutrinos. We will present and compare two related solutions
to these problems: 1) The conflict between BBN and leptogenesis can be avoided
in presence of a hidden sector with light supersymmetric particles which open
new decay channels for the dangerous long-lived particles. 2) If there is a
condensate in the hidden sector, such additional decay channels can be
alternatively opened by dynamical breaking of matter parity in the hidden
sector.
|
[
{
"created": "Wed, 29 Sep 2010 12:36:15 GMT",
"version": "v1"
}
] |
2011-01-04
|
[
[
"Weniger",
"Christoph",
""
]
] |
Thermal leptogenesis and supergravity are attractive scenarios for physics beyond the standard model. However, it is well known that the super-weak interaction of the gravitino often leads to problems with primordial nucleosynthesis in the standard scenario of matter parity conserving MSSM + three right-handed neutrinos. We will present and compare two related solutions to these problems: 1) The conflict between BBN and leptogenesis can be avoided in presence of a hidden sector with light supersymmetric particles which open new decay channels for the dangerous long-lived particles. 2) If there is a condensate in the hidden sector, such additional decay channels can be alternatively opened by dynamical breaking of matter parity in the hidden sector.
|
0712.1930
|
M. N. Rebelo
|
M. N. Rebelo
|
Leptonic CP Violation and Leptogenesis
|
Invited talk, to appear in the proceedings of 6th International
Heidelberg Conference on Dark Matter in Astro and Particle Physics, Sydney,
Australia, 24-28 Sep 2007. Reference number, cited in the last paragraph,
corrected
| null |
10.1142/9789812814357_0018
| null |
hep-ph
| null |
We review some recent results on the connection between CP violation at low
energies and Leptogenesis in the framework of specific flavour structures for
the fundamental leptonic mass matrices with zero textures.
|
[
{
"created": "Wed, 12 Dec 2007 16:50:37 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2007 15:55:06 GMT",
"version": "v2"
}
] |
2017-08-23
|
[
[
"Rebelo",
"M. N.",
""
]
] |
We review some recent results on the connection between CP violation at low energies and Leptogenesis in the framework of specific flavour structures for the fundamental leptonic mass matrices with zero textures.
|
hep-ph/9607276
|
Roberto Casalbuoni, Geneva
|
R. Casalbuoni, S. De Curtis, D. Dominici and M. Grazzini
|
An Extension of the Electroweak Model with Decoupling at Low Energy
|
13+2 pages, LaTex
|
Phys.Lett. B388 (1996) 112-120
|
10.1016/0370-2693(96)01129-X
|
DFF 251/6/96
|
hep-ph
| null |
We present a renormalizable model of electroweak interactions containing an
extra $SU(2)'_L\otimes SU(2)'_R$ symmetry. The masses of the corresponding
gauge bosons and of the associated Higgs particles can be made heavy by tuning
a convenient vacuum expectation value. According to the way in which the heavy
mass limit is taken we obtain a previously considered non-linear model
(degenerate BESS) which, in this limit, decouples giving rise to the Higgsless
Standard Model (SM). Otherwise we can get a model which decouples giving the
full SM. In this paper we argue that in the second limit the decoupling holds
true also at the level of radiative corrections. Therefore the model discussed
here is not distinguishable from the SM at low energy. Of course the two models
differ deeply at higher energies.
|
[
{
"created": "Wed, 10 Jul 1996 08:31:50 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Casalbuoni",
"R.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Dominici",
"D.",
""
],
[
"Grazzini",
"M.",
""
]
] |
We present a renormalizable model of electroweak interactions containing an extra $SU(2)'_L\otimes SU(2)'_R$ symmetry. The masses of the corresponding gauge bosons and of the associated Higgs particles can be made heavy by tuning a convenient vacuum expectation value. According to the way in which the heavy mass limit is taken we obtain a previously considered non-linear model (degenerate BESS) which, in this limit, decouples giving rise to the Higgsless Standard Model (SM). Otherwise we can get a model which decouples giving the full SM. In this paper we argue that in the second limit the decoupling holds true also at the level of radiative corrections. Therefore the model discussed here is not distinguishable from the SM at low energy. Of course the two models differ deeply at higher energies.
|
hep-ph/0512232
|
Margarete Muhlleitner
|
M. M. Muhlleitner
|
Higgs Boson Search at e+e- and Photon Linear Colliders
|
Proceedings PLC2005, Kazimierz 2005
|
Acta Phys.Polon. B37 (2006) 1127-1134
| null |
LAPTH-CONF-1134/05
|
hep-ph
| null |
The various search modes for the Higgs bosons of the Standard Model (SM) and
its Minimal Supersymmetric Extension (MSSM) at the International Linear
Collider (ILC) will be summarized briefly. In particular, as a unique discovery
mode the production of heavy neutral MSSM Higgs bosons for medium values of
$\tan\beta$ in photon collisions will be presented. Furthermore, $\tau^+\tau^-$
fusion into MSSM Higgs bosons in the photon mode will be shown to give access
to the mixing parameter $\tan\beta$ with a precision of better than 10% for
large values of this parameter.
|
[
{
"created": "Mon, 19 Dec 2005 13:43:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Muhlleitner",
"M. M.",
""
]
] |
The various search modes for the Higgs bosons of the Standard Model (SM) and its Minimal Supersymmetric Extension (MSSM) at the International Linear Collider (ILC) will be summarized briefly. In particular, as a unique discovery mode the production of heavy neutral MSSM Higgs bosons for medium values of $\tan\beta$ in photon collisions will be presented. Furthermore, $\tau^+\tau^-$ fusion into MSSM Higgs bosons in the photon mode will be shown to give access to the mixing parameter $\tan\beta$ with a precision of better than 10% for large values of this parameter.
|
hep-ph/9712316
|
Georg Kreyerhoff
|
Saul Barshay and Georg Kreyerhoff
|
The Inflaton As Dark Matter
|
17 pages, 4 eps-figures. To be published in Zeitschr. fuer Physik C.
Some comments concerning vacuum energy added
|
Eur.Phys.J.C5:369-377,1998
|
10.1007/s100520050282
|
PITHA 97/46
|
hep-ph
| null |
Within the framework of an explicit dynamical model, in which we calculate
the radiatively-corrected, tree-level potential that sets up inflation, we show
that the inflaton can be a significant part of dark matter today. We exhibit
potentials with both a maximum and a minimum. Using the calculated position of
the potential minimum, and an estimate for fluctuations of the inflaton field
in the early universe, we calculate a contribution to the matter energy density
of $(1-2)\times 10^{-47}\GeV^4$ in the present universe, from cold inflatons
with mass of about $6\times 10^9\GeV$. We show that the inflaton might decay in
a specific way, and we calculate a possible lifetime that is several orders of
magnitude greater than the present age of the universe. Inflaton decay is
related to an interaction which, together with a spontaneous breakdown of CP
invariance at a cosmological energy scale, can give rise to a
neutrino-antineutrino asymmetry just prior to the time of electroweak symmetry
breaking.
|
[
{
"created": "Tue, 9 Dec 1997 18:07:52 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 1998 16:46:24 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Barshay",
"Saul",
""
],
[
"Kreyerhoff",
"Georg",
""
]
] |
Within the framework of an explicit dynamical model, in which we calculate the radiatively-corrected, tree-level potential that sets up inflation, we show that the inflaton can be a significant part of dark matter today. We exhibit potentials with both a maximum and a minimum. Using the calculated position of the potential minimum, and an estimate for fluctuations of the inflaton field in the early universe, we calculate a contribution to the matter energy density of $(1-2)\times 10^{-47}\GeV^4$ in the present universe, from cold inflatons with mass of about $6\times 10^9\GeV$. We show that the inflaton might decay in a specific way, and we calculate a possible lifetime that is several orders of magnitude greater than the present age of the universe. Inflaton decay is related to an interaction which, together with a spontaneous breakdown of CP invariance at a cosmological energy scale, can give rise to a neutrino-antineutrino asymmetry just prior to the time of electroweak symmetry breaking.
|
1603.08211
|
Leonid Slad
|
L.M. Slad
|
On the origin of the discrepancy between the expected and observed
results at KamLAND
|
6 pages. Significant additions, editorial changes
| null | null | null |
hep-ph hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After a logically clear and simple solution of the solar neutrino problem on
the basis of the hypothesis about the existence of a new interaction involving
electron neutrinos and nucleons, the question arose about the origin of the
distinction between the expected and observed results of the experiment with
reactor antineutrino at KamLAND. In the present work, a significant attenuation
of light during its propagation in the KamLAND liquid scintillator is noted,
the effect of which on the observability of the expected inverse beta-decay
events and on the reconstruction of their characteristics has not been
adequately analyzed. Because of this, we do not consider the declared results
of the KamLAND experiment as reliable.
|
[
{
"created": "Sun, 27 Mar 2016 12:35:37 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2018 14:05:51 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Jul 2019 08:54:52 GMT",
"version": "v3"
},
{
"created": "Tue, 24 Dec 2019 08:39:59 GMT",
"version": "v4"
}
] |
2019-12-25
|
[
[
"Slad",
"L. M.",
""
]
] |
After a logically clear and simple solution of the solar neutrino problem on the basis of the hypothesis about the existence of a new interaction involving electron neutrinos and nucleons, the question arose about the origin of the distinction between the expected and observed results of the experiment with reactor antineutrino at KamLAND. In the present work, a significant attenuation of light during its propagation in the KamLAND liquid scintillator is noted, the effect of which on the observability of the expected inverse beta-decay events and on the reconstruction of their characteristics has not been adequately analyzed. Because of this, we do not consider the declared results of the KamLAND experiment as reliable.
|
hep-ph/0507057
|
Emerson Luna
|
E. G. S. Luna, A. F. Martini, M. J. Menon, A. Mihara and A. A. Natale
|
Influence of a dynamical gluon mass in the $pp$ and $\bar{p}p$ forward
scattering
|
20 pages, 5 figures; misprints corrected and comments added. To
appear in Phys. Rev. D
|
Phys.Rev. D72 (2005) 034019
|
10.1103/PhysRevD.72.034019
| null |
hep-ph hep-th
| null |
We compute the tree level cross section for gluon-gluon elastic scattering
taking into account a dynamical gluon mass, and show that this mass scale is a
natural regulator for this subprocess cross section. Using an eikonal approach
in order to examine the relationship between this gluon-gluon scattering and
the elastic $pp$ and $\bar{p}p$ channels, we found that the dynamical gluon
mass is of the same order of magnitude as the {\it ad hoc} infrared mass scale
$m_{0}$ underlying eikonalized QCD-inspired models. We argue that this
correspondence is not an accidental result, and that this dynamical scale
indeed represents the onset of non-perturbative contributions to the elastic
hadron-hadron scattering. We apply the eikonal model with a dynamical infrared
mass scale to obtain predictions for $\sigma_{tot}^{pp,\bar{p}p}$,
$\rho^{pp,\bar{p}p}$, slope $B^{pp,\bar{p}p}$, and differential elastic
scattering cross section $d\sigma^{\bar{p}p}/dt$ at Tevatron and CERN-LHC
energies.
|
[
{
"created": "Tue, 5 Jul 2005 13:54:52 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Aug 2005 21:51:44 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Luna",
"E. G. S.",
""
],
[
"Martini",
"A. F.",
""
],
[
"Menon",
"M. J.",
""
],
[
"Mihara",
"A.",
""
],
[
"Natale",
"A. A.",
""
]
] |
We compute the tree level cross section for gluon-gluon elastic scattering taking into account a dynamical gluon mass, and show that this mass scale is a natural regulator for this subprocess cross section. Using an eikonal approach in order to examine the relationship between this gluon-gluon scattering and the elastic $pp$ and $\bar{p}p$ channels, we found that the dynamical gluon mass is of the same order of magnitude as the {\it ad hoc} infrared mass scale $m_{0}$ underlying eikonalized QCD-inspired models. We argue that this correspondence is not an accidental result, and that this dynamical scale indeed represents the onset of non-perturbative contributions to the elastic hadron-hadron scattering. We apply the eikonal model with a dynamical infrared mass scale to obtain predictions for $\sigma_{tot}^{pp,\bar{p}p}$, $\rho^{pp,\bar{p}p}$, slope $B^{pp,\bar{p}p}$, and differential elastic scattering cross section $d\sigma^{\bar{p}p}/dt$ at Tevatron and CERN-LHC energies.
|
1509.07274
|
Junegone Chay
|
Junegone Chay and Inchol Kim
|
Factorization of the dijet cross section with the Georgi jet algorithm
in $e^+ e^-$ annihilation
|
11 pages, 5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the dijet cross section in $e^+ e^-$ annihilation using the
Georgi jet algorithm, or the maximizing jet algorithm. The cross section is
factorized into the hard, collinear and soft parts. Each factorized function is
computed to next-to-leading order, and is shown to be infrared finite. The
large logarithms are resummed at next-to-leading logarithmic accuracy. By
analyzing the phase space for the jet algorithm, the Georgi algorithm turns out
to be equivalent to the Sterman-Weinberg and the cone-type algorithms.
|
[
{
"created": "Thu, 24 Sep 2015 08:34:51 GMT",
"version": "v1"
}
] |
2015-09-25
|
[
[
"Chay",
"Junegone",
""
],
[
"Kim",
"Inchol",
""
]
] |
We consider the dijet cross section in $e^+ e^-$ annihilation using the Georgi jet algorithm, or the maximizing jet algorithm. The cross section is factorized into the hard, collinear and soft parts. Each factorized function is computed to next-to-leading order, and is shown to be infrared finite. The large logarithms are resummed at next-to-leading logarithmic accuracy. By analyzing the phase space for the jet algorithm, the Georgi algorithm turns out to be equivalent to the Sterman-Weinberg and the cone-type algorithms.
|
2402.18126
|
Teppei Katori
|
Carlos A. Arg\"uelles, Kareem Farrag, and Teppei Katori
|
Ultra-light Dark Matter Search with Astrophysical Neutrino Flavour
|
Presented at the 38th International Cosmic Ray Conference (ICRC2023),
7 pages, Published in PoS ICRC2023 (2023) 1415
| null |
10.22323/1.444.1415
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The ultra-light dark matter is a new class of dark matter candidates. Unlike
traditional dark matter particle candidates, the ultra-light dark matter
behaves like a classical field, which saturates the entire Milky Way galaxy
with a coherent oscillation. If such dark matter exists and couples with
neutrinos, properties of astrophysical neutrinos propagating in the Milky Way
would be modified and detectable by neutrino telescopes such as IceCube.
Meantime, IceCube looked for quantum-gravity-motivated effects from the
astrophysical neutrino flavour information. IceCube did not find evidence of
new physics, and they set limits on neutrino - Lorentz violating field
couplings. Here, we investigate if these results can be applied to limit the
ultra-light dark matter couplings with neutrinos. It is found that the strong
limits of neutrino-dark matter couplings in low dark matter mass regions can be
obtained in this approach.
|
[
{
"created": "Wed, 28 Feb 2024 07:35:21 GMT",
"version": "v1"
}
] |
2024-02-29
|
[
[
"Argüelles",
"Carlos A.",
""
],
[
"Farrag",
"Kareem",
""
],
[
"Katori",
"Teppei",
""
]
] |
The ultra-light dark matter is a new class of dark matter candidates. Unlike traditional dark matter particle candidates, the ultra-light dark matter behaves like a classical field, which saturates the entire Milky Way galaxy with a coherent oscillation. If such dark matter exists and couples with neutrinos, properties of astrophysical neutrinos propagating in the Milky Way would be modified and detectable by neutrino telescopes such as IceCube. Meantime, IceCube looked for quantum-gravity-motivated effects from the astrophysical neutrino flavour information. IceCube did not find evidence of new physics, and they set limits on neutrino - Lorentz violating field couplings. Here, we investigate if these results can be applied to limit the ultra-light dark matter couplings with neutrinos. It is found that the strong limits of neutrino-dark matter couplings in low dark matter mass regions can be obtained in this approach.
|
0909.3420
|
Kemal Ozeren
|
Robert V. Harlander and Kemal J. Ozeren
|
Finite top mass effects for hadronic Higgs production at
next-to-next-to-leading order
|
21 pages, 8 figures
|
JHEP 0911:088,2009
|
10.1088/1126-6708/2009/11/088
|
WUB/09-10
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The first four terms of an expansion in mH^2/mt^2 of the total inclusive
cross section for Higgs production in gluon fusion are evaluated through
next-to-next-to-leading order QCD. A reliable and precise approximation of the
full top mass dependence at NNLO is derived and compared to the frequently used
heavy-top limit. It is found that both results agree numerically to better than
0.5% in the Higgs mass range of 100-300 GeV. This validates the higher order
results for the inclusive Higgs cross section and justifies the heavy-top limit
as a powerful tool for Higgs phenomenology at the LHC and the Tevatron.
|
[
{
"created": "Fri, 18 Sep 2009 12:59:20 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Harlander",
"Robert V.",
""
],
[
"Ozeren",
"Kemal J.",
""
]
] |
The first four terms of an expansion in mH^2/mt^2 of the total inclusive cross section for Higgs production in gluon fusion are evaluated through next-to-next-to-leading order QCD. A reliable and precise approximation of the full top mass dependence at NNLO is derived and compared to the frequently used heavy-top limit. It is found that both results agree numerically to better than 0.5% in the Higgs mass range of 100-300 GeV. This validates the higher order results for the inclusive Higgs cross section and justifies the heavy-top limit as a powerful tool for Higgs phenomenology at the LHC and the Tevatron.
|
2001.06849
|
Raghunath Sahoo
|
Neelkamal Mallick, Sushanta Tripathy, Raghunath Sahoo, and Antonio
Ortiz
|
First implementation of transverse spherocity analysis for heavy-ion
collisions at the Large Hadron Collider energies
|
9 pages and 9 captioned figures
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transverse spherocity, an event shape observable, has a very unique
capability to separate the events based on their geometrical shape, i.e. jetty
and isotropic. In this work, we use transverse spherocity for the first time in
heavy-ion collisions using A Multi-Phase Transport Model (AMPT). We obtain the
transverse momentum spectra, integrated yield, mean transverse momentum and
azimuthal anisotropy for identified particles in Xe-Xe collisions at
$\sqrt{s_{\rm{NN}}} = 5.44$ TeV and Pb-Pb collisions at $\sqrt{s_{\rm{NN}}} =
5.02$ TeV. The indication of collectivity in heavy-ion collisions can be
clearly seen while comparing the transverse momentum spectra from jetty and
isotropic events. The elliptic flow as a function of transverse spherocity
shows that the isotropic events have nearly zero elliptic flow and the elliptic
flow is mostly dominated by the jetty events. This study will pave a way to
focus on jetty events in heavy-ion collisions in order to investigate jet
medium modification and jet hadro-chemistry in a sophisticated manner.
|
[
{
"created": "Sun, 19 Jan 2020 15:37:18 GMT",
"version": "v1"
}
] |
2020-01-22
|
[
[
"Mallick",
"Neelkamal",
""
],
[
"Tripathy",
"Sushanta",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Ortiz",
"Antonio",
""
]
] |
Transverse spherocity, an event shape observable, has a very unique capability to separate the events based on their geometrical shape, i.e. jetty and isotropic. In this work, we use transverse spherocity for the first time in heavy-ion collisions using A Multi-Phase Transport Model (AMPT). We obtain the transverse momentum spectra, integrated yield, mean transverse momentum and azimuthal anisotropy for identified particles in Xe-Xe collisions at $\sqrt{s_{\rm{NN}}} = 5.44$ TeV and Pb-Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV. The indication of collectivity in heavy-ion collisions can be clearly seen while comparing the transverse momentum spectra from jetty and isotropic events. The elliptic flow as a function of transverse spherocity shows that the isotropic events have nearly zero elliptic flow and the elliptic flow is mostly dominated by the jetty events. This study will pave a way to focus on jetty events in heavy-ion collisions in order to investigate jet medium modification and jet hadro-chemistry in a sophisticated manner.
|
hep-ph/0410275
|
Giuseppe Marchesini
|
Giuseppe Marchesini
|
Jet-shape observables
|
4 pages, talk at ICHEP2004, Beijing, August 2004
| null |
10.1142/9789812702227_0115
| null |
hep-ph
| null |
Studies of jet-shape observables in hard processes are summarized together
with future developments
|
[
{
"created": "Wed, 20 Oct 2004 13:17:17 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Marchesini",
"Giuseppe",
""
]
] |
Studies of jet-shape observables in hard processes are summarized together with future developments
|
hep-ph/0304071
|
Stefano Profumo
|
Stefano Profumo
|
Neutralino Dark Matter, b-tau Yukawa Unification and Non-Universal
Sfermion Masses
|
38 pages, 27 Figures, Latex; Version accepted for publication in PRD
|
Phys.Rev. D68 (2003) 015006
|
10.1103/PhysRevD.68.015006
|
SISSA 29/2003/EP
|
hep-ph astro-ph hep-th
| null |
We study the implications of minimal non-Universal Boundary Conditions in the
sfermion Soft SUSY Breaking (SSB) masses of mSUGRA. We impose asymptotic b-tau
Yukawa coupling Unification and we resort to a parameterization of the
deviation from Universality in the SSB motivated by the multiplet structure of
SU(5) GUT. A set of cosmo-phenomenological constraints, including the recent
results from WMAP, determines the allowed parameter space of the models under
consideration. We highlight a new coannihilation corridor where
neutralino-sbottom and neutralino-tau sneutrino-stau coannihilations
significantly contribute to the reduction of the neutralino relic density.
|
[
{
"created": "Mon, 7 Apr 2003 17:17:59 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Apr 2003 17:19:31 GMT",
"version": "v2"
},
{
"created": "Sun, 25 May 2003 11:46:06 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Profumo",
"Stefano",
""
]
] |
We study the implications of minimal non-Universal Boundary Conditions in the sfermion Soft SUSY Breaking (SSB) masses of mSUGRA. We impose asymptotic b-tau Yukawa coupling Unification and we resort to a parameterization of the deviation from Universality in the SSB motivated by the multiplet structure of SU(5) GUT. A set of cosmo-phenomenological constraints, including the recent results from WMAP, determines the allowed parameter space of the models under consideration. We highlight a new coannihilation corridor where neutralino-sbottom and neutralino-tau sneutrino-stau coannihilations significantly contribute to the reduction of the neutralino relic density.
|
1512.05618
|
Anibal Medina
|
Peter Cox, Anibal D. Medina, Tirtha Sankar Ray and Andrew Spray
|
Implications of diphoton searches for a Radion in the Bulk-Higgs
Scenario
|
20 pages, 12 figures. Several changes including consequences from
ICHEP2016. Final version accepted by journal
|
International Journal of Modern Physics A Vol. 32 (2017), 1750020
|
10.1142/S0217751X17500208
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we point out that the apparent diphoton excess initially
presented by the ATLAS and CMS collaborations could have originated from a
radion in the bulk Higgs scenario within a warped extra dimension. In this
scenario the couplings of the radion to massive gauge bosons are suppressed,
allowing it to evade existing searches. In the presence of mixing with the
Higgs, due to the strong constraints from diboson searches, only points near
what we denominate the alignment region were able to explain the diphoton
signal and evade other experimental constraints. In light of the new
measurements presented at ICHEP 2016 by both LHC collaborations, which do not
confirm the initial diphoton excess, we study the current and future collider
constraints on a radion within the bulk-Higgs scenario. We find that searches
in the diphoton channel provide the most powerful probe of this scenario and
already exclude large regions of parameter space, particularly for smaller warp
factors. The radion has a sizeable branching ratio into top pairs and this
channel may also give competitive constraints in the future. Finally, diHiggs
searches can provide a complementary probe in the case of non-zero radion-Higgs
mixing but strong alignment.
|
[
{
"created": "Thu, 17 Dec 2015 15:02:00 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2016 08:07:20 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Feb 2017 09:58:23 GMT",
"version": "v3"
}
] |
2017-02-08
|
[
[
"Cox",
"Peter",
""
],
[
"Medina",
"Anibal D.",
""
],
[
"Ray",
"Tirtha Sankar",
""
],
[
"Spray",
"Andrew",
""
]
] |
In this work we point out that the apparent diphoton excess initially presented by the ATLAS and CMS collaborations could have originated from a radion in the bulk Higgs scenario within a warped extra dimension. In this scenario the couplings of the radion to massive gauge bosons are suppressed, allowing it to evade existing searches. In the presence of mixing with the Higgs, due to the strong constraints from diboson searches, only points near what we denominate the alignment region were able to explain the diphoton signal and evade other experimental constraints. In light of the new measurements presented at ICHEP 2016 by both LHC collaborations, which do not confirm the initial diphoton excess, we study the current and future collider constraints on a radion within the bulk-Higgs scenario. We find that searches in the diphoton channel provide the most powerful probe of this scenario and already exclude large regions of parameter space, particularly for smaller warp factors. The radion has a sizeable branching ratio into top pairs and this channel may also give competitive constraints in the future. Finally, diHiggs searches can provide a complementary probe in the case of non-zero radion-Higgs mixing but strong alignment.
|
1301.2592
|
Jorge Segovia
|
J. Segovia, D.R. Entem and F. Fernandez
|
Strong charmonium decays in a microscopic model
|
22 pages, 6 tables, 1 figure. To be submitted to Nucl. Phys. A
| null |
10.1016/j.nuclphysa.2013.07.004
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although the spectra of heavy quarkonium systems have been successfully
explained by certain QCD motivated potential models, their strong decays are
still an open problem. We perform a microscopic calculation of vector
charmonium strong decays into open-charm mesons where the $q\bar{q}$ pairs are
created from the same interquark interactions acting in the quark model that
has been used to describe its spectrum, and also its leptonic and radiative
decays. We compare the numerical results with those predicted by the
$^{3}P_{0}$ decay model and with the available experimental data, and discuss
the possible influence on the strong widths of the different terms of the
potential. A comparison with other predictions from similar microscopic decay
models is also included.
|
[
{
"created": "Fri, 11 Jan 2013 20:49:31 GMT",
"version": "v1"
}
] |
2015-06-12
|
[
[
"Segovia",
"J.",
""
],
[
"Entem",
"D. R.",
""
],
[
"Fernandez",
"F.",
""
]
] |
Although the spectra of heavy quarkonium systems have been successfully explained by certain QCD motivated potential models, their strong decays are still an open problem. We perform a microscopic calculation of vector charmonium strong decays into open-charm mesons where the $q\bar{q}$ pairs are created from the same interquark interactions acting in the quark model that has been used to describe its spectrum, and also its leptonic and radiative decays. We compare the numerical results with those predicted by the $^{3}P_{0}$ decay model and with the available experimental data, and discuss the possible influence on the strong widths of the different terms of the potential. A comparison with other predictions from similar microscopic decay models is also included.
|
hep-ph/0106017
|
Peter Petreczky
|
S. Digal, P. Petreczky and H. Satz
|
Quarkonium Feed-Down and Sequential Suppression
|
19 pages, LaTeX, 11 figures
|
Phys.Rev. D64 (2001) 094015
|
10.1103/PhysRevD.64.094015
|
BI-TP 2001/09
|
hep-ph hep-lat
| null |
About 40-50 % of the quarkonium ground states J/psi(1S) and Upsilon(1S)
produced in hadronic collisions originate from the decay of higher excitations.
In a hot medium, these higher states are dissociated at lower temperatures than
the more tightly bound ground states, leading to a sequential suppression
pattern. Using new finite temperature lattice results, we specify the in-medium
potential between heavy quarks and determine the dissociation points of
different quarkonium states. On the basis of recent CDF data on bottomonium
production, we then obtain first predictions for sequential Upsilon suppression
in nuclear collisions.
|
[
{
"created": "Fri, 1 Jun 2001 18:07:42 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jun 2001 06:26:29 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Digal",
"S.",
""
],
[
"Petreczky",
"P.",
""
],
[
"Satz",
"H.",
""
]
] |
About 40-50 % of the quarkonium ground states J/psi(1S) and Upsilon(1S) produced in hadronic collisions originate from the decay of higher excitations. In a hot medium, these higher states are dissociated at lower temperatures than the more tightly bound ground states, leading to a sequential suppression pattern. Using new finite temperature lattice results, we specify the in-medium potential between heavy quarks and determine the dissociation points of different quarkonium states. On the basis of recent CDF data on bottomonium production, we then obtain first predictions for sequential Upsilon suppression in nuclear collisions.
|
hep-ph/0310133
|
Daniel Bedingham
|
D. J. Bedingham
|
Out-of-equilibrium quantum fields with conserved charge
|
11 pages, 5 figures, replacement with improved presentation
|
Phys.Rev. D69 (2004) 105013
|
10.1103/PhysRevD.69.105013
| null |
hep-ph
| null |
We study the out-of-equilibrium evolution of an O(2)-invariant scalar field
in which a conserved charge is stored. We apply a loop expansion of the
2-particle irreducible effective action to 3-loop order. Equations of motion
are derived which conserve both total charge and total energy yet allow for the
effects of scattering whereby charge and energy can transfer between modes.
Working in (1+1)-dimensions we solve the equations of motion numerically for a
system knocked out of equilibrium by a sudden temperature quench. We examine
the initial stages of the charge and energy redistribution. This provides a
basis from which we can understand the formation of Bose-Einstein condensates
from first principles.
|
[
{
"created": "Fri, 10 Oct 2003 15:42:16 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Mar 2004 12:36:12 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Bedingham",
"D. J.",
""
]
] |
We study the out-of-equilibrium evolution of an O(2)-invariant scalar field in which a conserved charge is stored. We apply a loop expansion of the 2-particle irreducible effective action to 3-loop order. Equations of motion are derived which conserve both total charge and total energy yet allow for the effects of scattering whereby charge and energy can transfer between modes. Working in (1+1)-dimensions we solve the equations of motion numerically for a system knocked out of equilibrium by a sudden temperature quench. We examine the initial stages of the charge and energy redistribution. This provides a basis from which we can understand the formation of Bose-Einstein condensates from first principles.
|
hep-ph/9407319
|
Murray Moinester
|
M. A. Moinester, D. Ashery, L. G. Landsberg, H. J. Lipkin
|
Pentaquark Search with Energetic Hadron Beams
|
12 pages text (latex) uses charm2000.sty file (appended), which
requires extracting and setting up charm2000.sty in your directory, in
addition to the tex file, TAUP-2179-94, submitted to CHARM2000 workshop
proceedings, revised July 19 to correct reference, revised Aug. 5 for
additional proofreading corrections, revised Aug. 9, to include missing
charm2000.sty file
| null | null | null |
hep-ph
| null |
The strange-anticharmed Pentaquark is a uud(cbar)s or udd(cbar)s five-quark
baryon that is expected to be either a narrow resonance, or possibly even
stable against strong decay. We describe this hyperon here; its structure,
binding energy and lifetime, resonance width, production mechanisms and decay
modes. We estimate production cross sections, techniques to reduce backgrounds
in search experiments, and how to optimize experiments to observe it.
Possibilities for enhancing the signal over background in Pentaquark searches
are investigated by examining predictions for detailed momentum and angular
distributions in multiparticle final states. General model-independent
predictions are presented as well as those from two models: a loosely bound
Ds-N "deuteron" and a strongly-bound five-quark model. Fermilab E791 data,
currently being analysed, may be marginal for showing definitive signals.
Future experiments with more than 10^5 reconstructed charmed baryon events
should have sensitivity to determine whether or not the Pentaquark exists.
|
[
{
"created": "Mon, 18 Jul 1994 19:22:29 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 1994 14:16:54 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Aug 1994 21:52:11 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Aug 1994 15:43:04 GMT",
"version": "v4"
}
] |
2008-02-03
|
[
[
"Moinester",
"M. A.",
""
],
[
"Ashery",
"D.",
""
],
[
"Landsberg",
"L. G.",
""
],
[
"Lipkin",
"H. J.",
""
]
] |
The strange-anticharmed Pentaquark is a uud(cbar)s or udd(cbar)s five-quark baryon that is expected to be either a narrow resonance, or possibly even stable against strong decay. We describe this hyperon here; its structure, binding energy and lifetime, resonance width, production mechanisms and decay modes. We estimate production cross sections, techniques to reduce backgrounds in search experiments, and how to optimize experiments to observe it. Possibilities for enhancing the signal over background in Pentaquark searches are investigated by examining predictions for detailed momentum and angular distributions in multiparticle final states. General model-independent predictions are presented as well as those from two models: a loosely bound Ds-N "deuteron" and a strongly-bound five-quark model. Fermilab E791 data, currently being analysed, may be marginal for showing definitive signals. Future experiments with more than 10^5 reconstructed charmed baryon events should have sensitivity to determine whether or not the Pentaquark exists.
|
hep-ph/9411300
|
Ulf Meissner
|
Ulf-G. Mei{\ss}ner
|
Baryon Chiral Perturbation Theory A.D. 1994
|
29 pp, plain LaTeX, no figures
|
Czech.J.Phys.45:153-179,1995
|
10.1007/BF01724517
|
TK 94 17
|
hep-ph nucl-th
| null |
In these lectures, the status of baryon chiral perturbation theory is
reviewed. Particular emphasis is put on the two--flavor sector and the physics
related to electromagnetic probes. I discuss in some detail the structure of
the effective Lagrangian at next--to--leading order, the meaning of low--energy
theorems in Compton scattering and pion photoproduction and confront the chiral
predictions with the existing data. Some remaining problems and challenges are
outlined.
|
[
{
"created": "Tue, 15 Nov 1994 14:27:09 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Meißner",
"Ulf-G.",
""
]
] |
In these lectures, the status of baryon chiral perturbation theory is reviewed. Particular emphasis is put on the two--flavor sector and the physics related to electromagnetic probes. I discuss in some detail the structure of the effective Lagrangian at next--to--leading order, the meaning of low--energy theorems in Compton scattering and pion photoproduction and confront the chiral predictions with the existing data. Some remaining problems and challenges are outlined.
|
0906.1121
|
Malin Sjodahl
|
Malin Sjodahl
|
Color structure for soft gluon resummation - a general recipe
|
16 pages
|
JHEP 0909:087,2009
|
10.1088/1126-6708/2009/09/087
|
KA-TP-09-06, MCNET-09-13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A strategy for calculating the color structure needed for soft gluon
resummation for processes with any number of colored partons is introduced
using a N_c --> infinity inspired basis. In this basis a general formalism can
be found at the same time as the calculations are simplified.
The advantages are illustrated by recalculating the soft anomalous dimension
matrix for the processes gg --> gg, q\qbar --> q \qbar g and q\qbar --> ggg.
|
[
{
"created": "Fri, 5 Jun 2009 13:28:49 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 2009 12:39:17 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Sjodahl",
"Malin",
""
]
] |
A strategy for calculating the color structure needed for soft gluon resummation for processes with any number of colored partons is introduced using a N_c --> infinity inspired basis. In this basis a general formalism can be found at the same time as the calculations are simplified. The advantages are illustrated by recalculating the soft anomalous dimension matrix for the processes gg --> gg, q\qbar --> q \qbar g and q\qbar --> ggg.
|
0807.3488
|
Enrique Ruiz Arriola
|
Enrique Ruiz Arriola, Wojciech Broniowski
|
Pion electromagnetic form factor, perturbative QCD, and large-Nc Regge
models
|
8 pages, 5 figures
|
Phys.Rev.D78:034031,2008
|
10.1103/PhysRevD.78.034031
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a construction of the pion electromagnetic form factor where the
transition from large-Nc Regge vector meson dominance models with infinitely
many resonances to perturbative QCD is built in explicitly. The construction is
based on an appropriate assignment of residues to the Regge poles, which
fulfills the constraints of the parton-hadron duality and perturbative QCD. The
model contains a slowly falling off non-perturbative contribution which
dominates over the perturbative QCD radiative corrections for the
experimentally accessible momenta. The leading order and next-to-leading order
calculations show a converging pattern which describes the available data
within uncertainties, while the onset of asymptotic QCD takes place at
extremely high momenta, Q ~ 10^3-10^4 GeV. The method can be straightforwardly
extended to study other form factors where the perturbative QCD result is
available.
|
[
{
"created": "Tue, 22 Jul 2008 15:47:11 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Broniowski",
"Wojciech",
""
]
] |
We present a construction of the pion electromagnetic form factor where the transition from large-Nc Regge vector meson dominance models with infinitely many resonances to perturbative QCD is built in explicitly. The construction is based on an appropriate assignment of residues to the Regge poles, which fulfills the constraints of the parton-hadron duality and perturbative QCD. The model contains a slowly falling off non-perturbative contribution which dominates over the perturbative QCD radiative corrections for the experimentally accessible momenta. The leading order and next-to-leading order calculations show a converging pattern which describes the available data within uncertainties, while the onset of asymptotic QCD takes place at extremely high momenta, Q ~ 10^3-10^4 GeV. The method can be straightforwardly extended to study other form factors where the perturbative QCD result is available.
|
0909.0233
|
Steven Thomas
|
Daniel Koschade, Moritz McGarrie, Steven Thomas
|
Direct Mediation and Metastable Supersymmetry Breaking for SO(10)
|
43 pages, Latex. Version to appear in JHEP.
| null |
10.1007/JHEP02(2010)100
|
QMUL-PH-09-17
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine a metastable $\mathcal{N}=1$ Macroscopic SO(N) SQCD model of
Intriligator, Seiberg and Shih (ISS). We introduce various baryon and meson
deformations, including multitrace operators and explore embedding an SO(10)
parent of the standard model into two weakly gauged flavour sectors. Direct
fundamental messengers and the symmetric pseudo-modulus messenger mediate SUSY
breaking to the MSSM. Gaugino and sfermion masses are computed and compared for
each deformation type. We also explore reducing the rank of the magnetic quark
matrix of the ISS model and find an additional fundamental messenger.
|
[
{
"created": "Tue, 1 Sep 2009 18:18:42 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Mar 2010 22:13:21 GMT",
"version": "v2"
}
] |
2015-05-14
|
[
[
"Koschade",
"Daniel",
""
],
[
"McGarrie",
"Moritz",
""
],
[
"Thomas",
"Steven",
""
]
] |
We examine a metastable $\mathcal{N}=1$ Macroscopic SO(N) SQCD model of Intriligator, Seiberg and Shih (ISS). We introduce various baryon and meson deformations, including multitrace operators and explore embedding an SO(10) parent of the standard model into two weakly gauged flavour sectors. Direct fundamental messengers and the symmetric pseudo-modulus messenger mediate SUSY breaking to the MSSM. Gaugino and sfermion masses are computed and compared for each deformation type. We also explore reducing the rank of the magnetic quark matrix of the ISS model and find an additional fundamental messenger.
|
1610.04133
|
Jue Zhang
|
Yu-Feng Li, Jue Zhang, Shun Zhou, Jing-yu Zhu
|
Looking into Analytical Approximations for Three-flavor Neutrino
Oscillation Probabilities in Matter
|
34 pages, 5 figures; v2: reference added, to appear in JHEP
|
JHEP 12 (2016) 109
|
10.1007/JHEP12(2016)109
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by tremendous progress in neutrino oscillation experiments, we
derive a new set of simple and compact formulas for three-flavor neutrino
oscillation probabilities in matter of a constant density. A useful definition
of the $\eta$-gauge neutrino mass-squared difference $\Delta^{}_* \equiv \eta
\Delta^{}_{31} + (1-\eta) \Delta^{}_{32}$ is introduced, where $\Delta^{}_{ji}
\equiv m^2_j - m^2_i$ for $ji = 21, 31, 32$ are the ordinary neutrino
mass-squared differences and $0 \leq \eta \leq 1$ is a real and positive
parameter. Expanding neutrino oscillation probabilities in terms of $\alpha
\equiv \Delta^{}_{21}/\Delta^{}_*$, we demonstrate that the analytical formulas
can be remarkably simplified for $\eta = \cos^2 \theta^{}_{12}$, with
$\theta_{12}^{}$ being the solar mixing angle. As a by-product, the mapping
from neutrino oscillation parameters in vacuum to their counterparts in matter
is obtained at the order of ${\cal O}(\alpha^2)$. Finally, we show that our
approximate formulas are not only valid for an arbitrary neutrino energy and
any baseline length, but also still maintaining a high level of accuracy.
|
[
{
"created": "Thu, 13 Oct 2016 15:41:59 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 14:43:25 GMT",
"version": "v2"
}
] |
2016-12-28
|
[
[
"Li",
"Yu-Feng",
""
],
[
"Zhang",
"Jue",
""
],
[
"Zhou",
"Shun",
""
],
[
"Zhu",
"Jing-yu",
""
]
] |
Motivated by tremendous progress in neutrino oscillation experiments, we derive a new set of simple and compact formulas for three-flavor neutrino oscillation probabilities in matter of a constant density. A useful definition of the $\eta$-gauge neutrino mass-squared difference $\Delta^{}_* \equiv \eta \Delta^{}_{31} + (1-\eta) \Delta^{}_{32}$ is introduced, where $\Delta^{}_{ji} \equiv m^2_j - m^2_i$ for $ji = 21, 31, 32$ are the ordinary neutrino mass-squared differences and $0 \leq \eta \leq 1$ is a real and positive parameter. Expanding neutrino oscillation probabilities in terms of $\alpha \equiv \Delta^{}_{21}/\Delta^{}_*$, we demonstrate that the analytical formulas can be remarkably simplified for $\eta = \cos^2 \theta^{}_{12}$, with $\theta_{12}^{}$ being the solar mixing angle. As a by-product, the mapping from neutrino oscillation parameters in vacuum to their counterparts in matter is obtained at the order of ${\cal O}(\alpha^2)$. Finally, we show that our approximate formulas are not only valid for an arbitrary neutrino energy and any baseline length, but also still maintaining a high level of accuracy.
|
hep-ph/0006151
| null |
P. Kocian (University of Lausanne)
|
Gauge-invariant description of the electromagnetic field in the Higgs
phase of the Standard Model
|
5 pages, no figures
| null | null |
UNIL-IPT/00-13
|
hep-ph
| null |
It is shown that the definition of the photon field in the broken-symmetry
phase of the electroweak theory proposed recently by O.T(ornkvist is equivalent
to that proposed previously by Vlasov et al.
|
[
{
"created": "Wed, 14 Jun 2000 09:54:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kocian",
"P.",
"",
"University of Lausanne"
]
] |
It is shown that the definition of the photon field in the broken-symmetry phase of the electroweak theory proposed recently by O.T(ornkvist is equivalent to that proposed previously by Vlasov et al.
|
0801.3029
|
Hiroshi Okada
|
Hiroshi Okada
|
Cosmological Constraints for the Cold Dark Matter and Model Building
based on the Flavor Symmetric Radiative Seesaw Model
|
4 pages, 1 figure. Talk given at ICGA8-For The 100th Anniversary of
Hideki Yukawa and Promotion of Women Scientists-, Nara Women's University,
Japan (August 29-September 1, 2007)
|
Prog.Theor.Phys.Suppl.172:220-223,2008
|
10.1143/PTPS.172.220
| null |
hep-ph
| null |
It is now clear that the masses of the neutrino sector are much lighter than
those of the other three sectors.There are many attempts to explain the
neutrino masses radiatively by means of inert Higgses, which don't have vacuum
expectation values. Then one can discuss cold dark matter candidates, because
of no needing so heavy particles and having a $Z_2$ parity symmetry
corresponding to the R-parity symmetry of the MSSM.
The most famous work would be the Zee model.
Recently a new type model along this line of thought was proposed by Mr. E.
Ma. We paid attention to this idea. We introduce a flavor symmetry based on a
dihedral group $D_6$ to constrain the Yukawa sector. For the neutrino sector,
we find that the maximal mixing of atmospheric neutrinos is realized, it can
also be shown that only an inverted mass spectrum, the value of
$|V_{MNS_{13}}|$ is 0.0034 and so on. When one extends the Higgs sector, it
leads to FCNCs mediated by Higgs fields generally. But in our model, the FCNCs
are (of course) suppressed for the experiments sufficiently. For the fermionic
CDM candidates, we find that the mass of the CDM and the inert Higgs should be
larger than about 230 and 300 GeV, respectively. If we restrict ourselves to a
perturbative regime, they should be lighter than about 750 GeV.
|
[
{
"created": "Sat, 19 Jan 2008 12:16:37 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Okada",
"Hiroshi",
""
]
] |
It is now clear that the masses of the neutrino sector are much lighter than those of the other three sectors.There are many attempts to explain the neutrino masses radiatively by means of inert Higgses, which don't have vacuum expectation values. Then one can discuss cold dark matter candidates, because of no needing so heavy particles and having a $Z_2$ parity symmetry corresponding to the R-parity symmetry of the MSSM. The most famous work would be the Zee model. Recently a new type model along this line of thought was proposed by Mr. E. Ma. We paid attention to this idea. We introduce a flavor symmetry based on a dihedral group $D_6$ to constrain the Yukawa sector. For the neutrino sector, we find that the maximal mixing of atmospheric neutrinos is realized, it can also be shown that only an inverted mass spectrum, the value of $|V_{MNS_{13}}|$ is 0.0034 and so on. When one extends the Higgs sector, it leads to FCNCs mediated by Higgs fields generally. But in our model, the FCNCs are (of course) suppressed for the experiments sufficiently. For the fermionic CDM candidates, we find that the mass of the CDM and the inert Higgs should be larger than about 230 and 300 GeV, respectively. If we restrict ourselves to a perturbative regime, they should be lighter than about 750 GeV.
|
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