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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9909252
|
Fedor Simkovic
|
Amand Faessler and Fedor Simkovic
|
Test of Physics beyond the Standard Model in Nuclei
|
20 pages including 3 figures, Latex, Talk presented at NANP99
(Non-Accelerator New Physics, Dubna, July 1999), to be published in Phys.
Atom. Nucl
|
Phys.Atom.Nucl.63:1165-1176,2000; Yad.Fiz.63N7:1240-1251,2000
|
10.1134/1.855762
| null |
hep-ph
| null |
The modern theories of Grand Unification (GUT) and supersymmetric (SUSY)
extensions of standard model (SM) suppose that the conservation laws of the SM
may be violated to some small degree. The nuclei are well-suited as a
laboratory to test fundamental symmetries and fundamental interactions like
lepton flavor (LF) and lepton number (LN) conservation. A prominent role
between experiments looking for LF and total LN violation play yet not observed
processes of neutrinoless double beta decay. The GUT's and SUSY models offer a
variety of mechanisms which allow this process to occur. They are based on
mixing of Majorana neutrinos and/or R-parity violation hypothesis. Although the
neutrinoless double beta decay has not been seen it is possible to extract from
the lower limits of the lifetime upper limits for the effective electron
Majorana neutrino mass, effective right handed weak interaction parameters, the
effective Majoron coupling constant, R-parity violating SUSY parameters etc.
In this work the limits on the LN violating parameters extracted from current
neutrinoless double beta decay experiments are listed. Studies in respect to
future neutrinoless double beta decay experimental projects are also presented.
|
[
{
"created": "Sat, 4 Sep 1999 17:29:53 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Faessler",
"Amand",
""
],
[
"Simkovic",
"Fedor",
""
]
] |
The modern theories of Grand Unification (GUT) and supersymmetric (SUSY) extensions of standard model (SM) suppose that the conservation laws of the SM may be violated to some small degree. The nuclei are well-suited as a laboratory to test fundamental symmetries and fundamental interactions like lepton flavor (LF) and lepton number (LN) conservation. A prominent role between experiments looking for LF and total LN violation play yet not observed processes of neutrinoless double beta decay. The GUT's and SUSY models offer a variety of mechanisms which allow this process to occur. They are based on mixing of Majorana neutrinos and/or R-parity violation hypothesis. Although the neutrinoless double beta decay has not been seen it is possible to extract from the lower limits of the lifetime upper limits for the effective electron Majorana neutrino mass, effective right handed weak interaction parameters, the effective Majoron coupling constant, R-parity violating SUSY parameters etc. In this work the limits on the LN violating parameters extracted from current neutrinoless double beta decay experiments are listed. Studies in respect to future neutrinoless double beta decay experimental projects are also presented.
|
hep-ph/0206256
|
Cristiano B. Mariotto
|
C. Brenner Mariotto, M.B. Gay Ducati (Rio Grande do Sul U.), G.
Ingelman (Uppsala U.)
|
Improved mapping of ccbar onto charmonium states
|
To appear in the proceedings of VIII International Workshop on Hadron
Physics (Hadrons 2002), Bento Goncalves, Brazil, 14 - 19 April 2002
| null | null | null |
hep-ph
| null |
We discuss the relative rates of different charmonium states and introduce an
improved model for mapping the continuous ccbar mass spectrum on the physical
charmonium resonances.
|
[
{
"created": "Tue, 25 Jun 2002 17:46:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mariotto",
"C. Brenner",
"",
"Rio Grande do Sul U."
],
[
"Ducati",
"M. B. Gay",
"",
"Rio Grande do Sul U."
],
[
"Ingelman",
"G.",
"",
"Uppsala U."
]
] |
We discuss the relative rates of different charmonium states and introduce an improved model for mapping the continuous ccbar mass spectrum on the physical charmonium resonances.
|
2108.04570
|
Kadir Ocalan
|
Kadir Ocalan
|
Impact of lepton $p_{T}$ threshold on the charge asymmetry predictions
for the inclusive $W$ boson production in $pp$ collisions at 13 TeV
|
11 pages, 7 figures
|
Chinese Phys. C 45 (2021) 083103
|
10.1088/1674-1137/ac03ad
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
This paper presents the impact of lepton transverse momentum $p^{l}_{T}$
threshold on the $W$ boson charge asymmetry predictions in perturbative QCD for
the inclusive $W^{\pm}+X \rightarrow l^{\pm} \nu +X$ production in
proton-proton ($pp$) collisions. The predictions are obtained with various
low-$p^{l}_{T}$ thresholds $p^{l}_{T} >$ 20, 25, 30, and 40 GeV in a fiducial
region encompassing both central and forward detector acceptances in terms of
the lepton pseudorapidty 0 $\leq \eta_{l} \leq$ 4.5. The predicted
distributions for the lepton charge asymmetry, which is defined by means of the
$\eta_{l}$ ($A_{\eta_{l}}$), at next-to-next-to-leading order (NNLO) accuracy
are compared with the CMS and LHCb data at 8 TeV center-of-mass collision
energy. The 8 TeV predictions are observed to reproduce the data fairly well
within the quoted uncertainties. The 13 TeV predictions by using various
$p^{l}_{T}$ thresholds are reported for the $A_{\eta_{l}}$ and also the charge
asymmetries that are defined in terms of the differential cross sections in
bins of the $W$ boson rapidity $y_{W}$ ($A_{y_{W}}$) and transverse momentum
$p^{W}_{T}$ ($A_{p^{W}_{T}}$). The NNLO predictions for the $A_{\eta_{l}}$,
$A_{y_{W}}$, and $A_{p^{W}_{T}}$ distributions are assessed to be in close
correlation with the $p^{l}_{T}$ value. The $A_{\eta_{l}}$ and $A_{y_{W}}$
distributions are particularly shown to be more correlated at a higher
$p^{l}_{T}$ threshold. The $A_{p^{W}_{T}}$ distributions are also reported from
the merged predictions with improved accuracy by the inclusion of
next-to-next-to-next-to-leading logarithm (N$^{3}$LL) corrections, i.e., at
NNLO+N$^{3}$LL. The predicted distributions from various $p^{l}_{T}$ thresholds
represent also a finer probe to provide more constraints on the ratio of $u$
and $d$ quark distribution functions in the parton momentum fraction range
$10^{-4} < x < 1$.
|
[
{
"created": "Tue, 10 Aug 2021 10:43:27 GMT",
"version": "v1"
}
] |
2021-08-11
|
[
[
"Ocalan",
"Kadir",
""
]
] |
This paper presents the impact of lepton transverse momentum $p^{l}_{T}$ threshold on the $W$ boson charge asymmetry predictions in perturbative QCD for the inclusive $W^{\pm}+X \rightarrow l^{\pm} \nu +X$ production in proton-proton ($pp$) collisions. The predictions are obtained with various low-$p^{l}_{T}$ thresholds $p^{l}_{T} >$ 20, 25, 30, and 40 GeV in a fiducial region encompassing both central and forward detector acceptances in terms of the lepton pseudorapidty 0 $\leq \eta_{l} \leq$ 4.5. The predicted distributions for the lepton charge asymmetry, which is defined by means of the $\eta_{l}$ ($A_{\eta_{l}}$), at next-to-next-to-leading order (NNLO) accuracy are compared with the CMS and LHCb data at 8 TeV center-of-mass collision energy. The 8 TeV predictions are observed to reproduce the data fairly well within the quoted uncertainties. The 13 TeV predictions by using various $p^{l}_{T}$ thresholds are reported for the $A_{\eta_{l}}$ and also the charge asymmetries that are defined in terms of the differential cross sections in bins of the $W$ boson rapidity $y_{W}$ ($A_{y_{W}}$) and transverse momentum $p^{W}_{T}$ ($A_{p^{W}_{T}}$). The NNLO predictions for the $A_{\eta_{l}}$, $A_{y_{W}}$, and $A_{p^{W}_{T}}$ distributions are assessed to be in close correlation with the $p^{l}_{T}$ value. The $A_{\eta_{l}}$ and $A_{y_{W}}$ distributions are particularly shown to be more correlated at a higher $p^{l}_{T}$ threshold. The $A_{p^{W}_{T}}$ distributions are also reported from the merged predictions with improved accuracy by the inclusion of next-to-next-to-next-to-leading logarithm (N$^{3}$LL) corrections, i.e., at NNLO+N$^{3}$LL. The predicted distributions from various $p^{l}_{T}$ thresholds represent also a finer probe to provide more constraints on the ratio of $u$ and $d$ quark distribution functions in the parton momentum fraction range $10^{-4} < x < 1$.
|
0903.1723
|
Alexander Lenz
|
Alexander Lenz, Meinulf G\"ockeler, Thomas Kaltenbrunner, Nikolaus
Warkentin
|
The Nucleon Distribution Amplitudes and their application to nucleon
form factors and the $N \to \Delta$ transition at intermediate values of
$Q^2$
|
28 pages, 28 figures, version accepted by PRD
|
Phys.Rev.D79:093007,2009
|
10.1103/PhysRevD.79.093007
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compare a recent lattice determination of the nucleon distribution
amplitudes with other approaches and models. We study the nucleon distribution
amplitudes up to twist 6 in next-to leading conformal spin and we also
investigate conformal d-wave contributions to the leading twist distribution
amplitude. With the help of light-cone sum rules one can relate the
distribution amplitudes to the form factors of the nucleon or the $ N \to
\Delta$ transition at intermediate values of the momentum transfer. We compare
our results with experimental data in the range 1 GeV$^2 \leq Q^2 \leq 10$
GeV$^2$. Keeping in mind that we are working only in LO QCD and NLO-QCD
corrections might be sizeable we already obtain a surprisingly good agreement
for the nucleon form factors $G_M^n$, $G_M^p$, $G_A^p$ and $G_T^p$ and for the
$N \to \Delta$ transition form factor ratios $R_{EM}$ and $R_{SM}$.
|
[
{
"created": "Tue, 10 Mar 2009 09:57:15 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Apr 2009 21:50:41 GMT",
"version": "v2"
}
] |
2009-07-30
|
[
[
"Lenz",
"Alexander",
""
],
[
"Göckeler",
"Meinulf",
""
],
[
"Kaltenbrunner",
"Thomas",
""
],
[
"Warkentin",
"Nikolaus",
""
]
] |
We compare a recent lattice determination of the nucleon distribution amplitudes with other approaches and models. We study the nucleon distribution amplitudes up to twist 6 in next-to leading conformal spin and we also investigate conformal d-wave contributions to the leading twist distribution amplitude. With the help of light-cone sum rules one can relate the distribution amplitudes to the form factors of the nucleon or the $ N \to \Delta$ transition at intermediate values of the momentum transfer. We compare our results with experimental data in the range 1 GeV$^2 \leq Q^2 \leq 10$ GeV$^2$. Keeping in mind that we are working only in LO QCD and NLO-QCD corrections might be sizeable we already obtain a surprisingly good agreement for the nucleon form factors $G_M^n$, $G_M^p$, $G_A^p$ and $G_T^p$ and for the $N \to \Delta$ transition form factor ratios $R_{EM}$ and $R_{SM}$.
|
hep-ph/9408253
| null |
M. Carena and C.E.M. Wagner
|
Higgs and Supersymmetric Particle Signals at the Infrared Fixed Point of
the Top Quark Mass
|
42 pages, 16 figures (not included), CERN-TH.7393/93
|
Nucl.Phys.B452:45-79,1995
|
10.1016/0550-3213(95)00341-O
| null |
hep-ph
| null |
We study the properties of the Higgs and supersymmetric particle spectrum
associated with the infrared fixed point solution of the top quark mass in the
MSSM. We concentrate on the possible detection of these particles, analysing
the deviations from the Standard Model predictions for the leptonic and
hadronic variables measured at LEP and for the decay rate $b\rightarrow
s\gamma$. We consider the low and moderate $\tan \beta$ regime, and we study
both, the cases of universal and non--universal soft supersymmetry breaking
parameters at high energies. In the first case, for any given value of the top
quark mass, the Higgs and sparticle spectra are completely determined as a
function of two soft supersymmetry breaking parameters. In the case of
non--universality, instead, the strong correlations between the sparticle
masses are relaxed, allowing a richer structure for the precision data
variables. We show, however, that the requirement that the low energy theory
proceeds from a grand unified theory with a local symmetry group including
$SU(5)$, strongly constrains the set of possible indirect experimental
signatures. As a general feature, whenever a significant deviation from the
Standard Model value of the precision data variables is predicted, a light
sparticle, visible at LEP2, appears in the spectrum.
|
[
{
"created": "Tue, 9 Aug 1994 03:23:57 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Carena",
"M.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] |
We study the properties of the Higgs and supersymmetric particle spectrum associated with the infrared fixed point solution of the top quark mass in the MSSM. We concentrate on the possible detection of these particles, analysing the deviations from the Standard Model predictions for the leptonic and hadronic variables measured at LEP and for the decay rate $b\rightarrow s\gamma$. We consider the low and moderate $\tan \beta$ regime, and we study both, the cases of universal and non--universal soft supersymmetry breaking parameters at high energies. In the first case, for any given value of the top quark mass, the Higgs and sparticle spectra are completely determined as a function of two soft supersymmetry breaking parameters. In the case of non--universality, instead, the strong correlations between the sparticle masses are relaxed, allowing a richer structure for the precision data variables. We show, however, that the requirement that the low energy theory proceeds from a grand unified theory with a local symmetry group including $SU(5)$, strongly constrains the set of possible indirect experimental signatures. As a general feature, whenever a significant deviation from the Standard Model value of the precision data variables is predicted, a light sparticle, visible at LEP2, appears in the spectrum.
|
1307.2031
|
Hideko Nagahiro
|
Hideko Nagahiro and Atsushi Hosaka
|
Composite and elementary nature of a resonance in the sigma model
|
13 pages, 11 figures, 2 tables
|
Phys. Rev. C 88, 055203 (2013)
|
10.1103/PhysRevC.88.055203
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the mixing nature of the low-lying scalar resonance consisting of
the pipi composite and the elementary particle within the sigma model. A method
to disentangle the mixing is formulated in the scattering theory with the
concept of the two-level problem. We investigate the composite and elementary
components of the sigma meson by changing a mixing parameter. We also study the
dependence of the results on model parameters such as the cut-off value and the
mass of the elementary sigma meson.
|
[
{
"created": "Mon, 8 Jul 2013 10:54:35 GMT",
"version": "v1"
}
] |
2013-11-13
|
[
[
"Nagahiro",
"Hideko",
""
],
[
"Hosaka",
"Atsushi",
""
]
] |
We analyze the mixing nature of the low-lying scalar resonance consisting of the pipi composite and the elementary particle within the sigma model. A method to disentangle the mixing is formulated in the scattering theory with the concept of the two-level problem. We investigate the composite and elementary components of the sigma meson by changing a mixing parameter. We also study the dependence of the results on model parameters such as the cut-off value and the mass of the elementary sigma meson.
|
1203.4218
|
Filippo Sala
|
Riccardo Barbieri, Dario Buttazzo, Filippo Sala, David M. Straub
|
Flavour physics from an approximate U(2)^3 symmetry
|
29 pages, 5 figures
| null |
10.1007/JHEP07(2012)181
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The quark sector of the Standard Model exhibits an approximate U(2)^3 flavour
symmetry. This symmetry, broken in specific directions dictated by minimality,
can explain the success of the Cabibbo-Kobayashi-Maskawa picture of flavour
mixing and CP violation, confirmed by the data so far, while allowing for
observable deviations from it, as expected in most models of ElectroWeak
Symmetry Breaking. Building on previous work in the specific context of
supersymmetry, we analyze the expected effects and we quantify the current
bounds in a general Effective Field Theory framework. As a further relevant
example we then show how the U(2)^3 symmetry and its breaking can be
implemented in a generic composite Higgs model and we make a first analysis of
its peculiar consequences. We also discuss how some partial extension of U(2)^3
to the lepton sector can arise, both in general and in composite Higgs models.
An optimistic though conceivable interpretation of the considerations developed
in this paper gives reasons to think that new physics searches in the flavour
sector may be about to explore an interesting realm of phenomena.
|
[
{
"created": "Mon, 19 Mar 2012 19:55:14 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Barbieri",
"Riccardo",
""
],
[
"Buttazzo",
"Dario",
""
],
[
"Sala",
"Filippo",
""
],
[
"Straub",
"David M.",
""
]
] |
The quark sector of the Standard Model exhibits an approximate U(2)^3 flavour symmetry. This symmetry, broken in specific directions dictated by minimality, can explain the success of the Cabibbo-Kobayashi-Maskawa picture of flavour mixing and CP violation, confirmed by the data so far, while allowing for observable deviations from it, as expected in most models of ElectroWeak Symmetry Breaking. Building on previous work in the specific context of supersymmetry, we analyze the expected effects and we quantify the current bounds in a general Effective Field Theory framework. As a further relevant example we then show how the U(2)^3 symmetry and its breaking can be implemented in a generic composite Higgs model and we make a first analysis of its peculiar consequences. We also discuss how some partial extension of U(2)^3 to the lepton sector can arise, both in general and in composite Higgs models. An optimistic though conceivable interpretation of the considerations developed in this paper gives reasons to think that new physics searches in the flavour sector may be about to explore an interesting realm of phenomena.
|
1111.4401
|
Jos Van Doorsselaere
|
M. N. Chernodub, J. Van Doorsselaere, H. Verschelde
|
Electromagnetically superconducting phase of vacuum in strong magnetic
field: structure of superconductor and superfluid vortex lattices in the
ground state
|
13 pages, 11 figures
| null |
10.1103/PhysRevD.85.045002
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently it was shown that vacuum in a background of strong enough magnetic
field becomes an electromagnetic superconductor due to interplay between strong
and electromagnetic forces. The superconducting ground state of the vacuum is
associated with a spontaneous emergence of quark-antiquark condensates which
carry quantum numbers of charged rho mesons. The rho-meson condensate is an
inhomogeneous structure made of the so-called rho vortices, which are parallel
to the magnetic field axis. The condensation of the charged rho mesons induces
a (much weaker) superfluid-like condensate with quantum numbers of the neutral
rho mesons. In this paper we show that the vortices in the superconducting
condensate organize themselves in an equilateral triangular lattice similarly
to an ordinary type-II superconductor. We show that each of these
superconductor vortices is accompanied by three superfluid vortices and three
superfluid antivortices made of the neutral rho meson condensate. The
superconductor vortex overlaps with one of the superfluid vortices. The
superposition of the superconducting and superfluid vortex lattices has a
honeycomb pattern.
|
[
{
"created": "Fri, 18 Nov 2011 15:47:34 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Chernodub",
"M. N.",
""
],
[
"Van Doorsselaere",
"J.",
""
],
[
"Verschelde",
"H.",
""
]
] |
Recently it was shown that vacuum in a background of strong enough magnetic field becomes an electromagnetic superconductor due to interplay between strong and electromagnetic forces. The superconducting ground state of the vacuum is associated with a spontaneous emergence of quark-antiquark condensates which carry quantum numbers of charged rho mesons. The rho-meson condensate is an inhomogeneous structure made of the so-called rho vortices, which are parallel to the magnetic field axis. The condensation of the charged rho mesons induces a (much weaker) superfluid-like condensate with quantum numbers of the neutral rho mesons. In this paper we show that the vortices in the superconducting condensate organize themselves in an equilateral triangular lattice similarly to an ordinary type-II superconductor. We show that each of these superconductor vortices is accompanied by three superfluid vortices and three superfluid antivortices made of the neutral rho meson condensate. The superconductor vortex overlaps with one of the superfluid vortices. The superposition of the superconducting and superfluid vortex lattices has a honeycomb pattern.
|
1408.5880
|
Jorge S. Diaz
|
Jorge S. Diaz
|
Tests of Lorentz symmetry in single beta decay
|
7 pages
|
Adv. High Energy Phys. 2014, 305298 (2014)
|
10.1155/2014/305298
|
KA-TP-23-2014
|
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Low-energy experiments studying single beta decay can serve as sensitive
probes of Lorentz invariance that can complement interferometric searches for
deviations from this spacetime symmetry. Experimental signatures of a
dimension-three operator for Lorentz violation that are unobservable in
neutrino oscillations are described for the decay the polarized and unpolarized
neutrons as well as for measurements of the spectral endpoint in beta decay.
|
[
{
"created": "Mon, 25 Aug 2014 19:47:09 GMT",
"version": "v1"
}
] |
2014-08-26
|
[
[
"Diaz",
"Jorge S.",
""
]
] |
Low-energy experiments studying single beta decay can serve as sensitive probes of Lorentz invariance that can complement interferometric searches for deviations from this spacetime symmetry. Experimental signatures of a dimension-three operator for Lorentz violation that are unobservable in neutrino oscillations are described for the decay the polarized and unpolarized neutrons as well as for measurements of the spectral endpoint in beta decay.
|
hep-ph/0308071
|
BingAn Li
|
Bing An Li
|
Invalid Ward-Takahashi identities and broken unitarity of the SM
|
18 pages
| null | null | null |
hep-ph
| null |
It is found that in the SM the Ward-Takahashi(WT) identities of the
axial-vector currents and the charged vector currents of fermions are invalid
after spontaneous symmetry breaking. The spin-0 components of Z and W fields
are revealed from the invalidity of these WT identities. The masses of these
spin-0 components are at $10^{14}$GeV. They are ghosts. Therefore, unitarity of
the SM after spontaneous symmetry breaking is broken at $10^{14}$GeV.
|
[
{
"created": "Wed, 6 Aug 2003 19:31:24 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Li",
"Bing An",
""
]
] |
It is found that in the SM the Ward-Takahashi(WT) identities of the axial-vector currents and the charged vector currents of fermions are invalid after spontaneous symmetry breaking. The spin-0 components of Z and W fields are revealed from the invalidity of these WT identities. The masses of these spin-0 components are at $10^{14}$GeV. They are ghosts. Therefore, unitarity of the SM after spontaneous symmetry breaking is broken at $10^{14}$GeV.
|
hep-ph/0612082
|
Brigitte Hiller
|
A.A. Osipov, B. Hiller, J. Moreira, A. H. Blin, J. da Providencia
|
Lowering the critical temperature with eight-quark interactions
|
4 pages, 2 figures
|
Phys.Lett.B646:91-94,2007
|
10.1016/j.physletb.2007.01.026
| null |
hep-ph
| null |
It is shown that eight-quark interactions, which are needed to stabilize the
ground state of the combined three flavor Nambu -- Jona-Lasinio and 't Hooft
Lagrangians, play also an important role in determining the critical
temperature at which transitions occur from the dynamically broken chiral phase
to the symmetric phase.
|
[
{
"created": "Thu, 7 Dec 2006 11:14:23 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Osipov",
"A. A.",
""
],
[
"Hiller",
"B.",
""
],
[
"Moreira",
"J.",
""
],
[
"Blin",
"A. H.",
""
],
[
"da Providencia",
"J.",
""
]
] |
It is shown that eight-quark interactions, which are needed to stabilize the ground state of the combined three flavor Nambu -- Jona-Lasinio and 't Hooft Lagrangians, play also an important role in determining the critical temperature at which transitions occur from the dynamically broken chiral phase to the symmetric phase.
|
1112.4360
|
S. Weinzierl
|
Stefan M\"uller-Stach, Stefan Weinzierl and Raphael Zayadeh
|
A second-order differential equation for the two-loop sunrise graph with
arbitrary masses
|
16 pages, version to be published
| null | null | null |
hep-ph math-ph math.AG math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive a second-order differential equation for the two-loop sunrise graph
in two dimensions with arbitrary masses. The differential equation is obtained
by viewing the Feynman integral as a period of a variation of a mixed Hodge
structure, where the variation is with respect to the external momentum
squared. The fibre is the complement of an elliptic curve. From the fact that
the first cohomology group of this elliptic curve is two-dimensional we obtain
a second-order differential equation. This is an improvement compared to the
usual way of deriving differential equations: Integration-by-parts identities
lead only to a coupled system of four first-order differential equations.
|
[
{
"created": "Mon, 19 Dec 2011 15:15:14 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Apr 2012 05:53:16 GMT",
"version": "v2"
}
] |
2012-05-01
|
[
[
"Müller-Stach",
"Stefan",
""
],
[
"Weinzierl",
"Stefan",
""
],
[
"Zayadeh",
"Raphael",
""
]
] |
We derive a second-order differential equation for the two-loop sunrise graph in two dimensions with arbitrary masses. The differential equation is obtained by viewing the Feynman integral as a period of a variation of a mixed Hodge structure, where the variation is with respect to the external momentum squared. The fibre is the complement of an elliptic curve. From the fact that the first cohomology group of this elliptic curve is two-dimensional we obtain a second-order differential equation. This is an improvement compared to the usual way of deriving differential equations: Integration-by-parts identities lead only to a coupled system of four first-order differential equations.
|
hep-ph/0311245
|
Robert N. Cahn
|
Robert N. Cahn and George H. Trilling
|
Experimental Limits on the Width of the Reported Theta(1540)+
|
3 pages, 1 figure, submitted to Physical Review D (RC)
|
Phys.Rev.D69:011501,2004
|
10.1103/PhysRevD.69.011501
|
LBNL-54065
|
hep-ph
| null |
Using data on K^+ collisions on xenon and deuterium we derive values and
limits on the width of the reported Theta(1540)^+ exotic baryon resonance. The
xenon experiment gives a width of 0.9\pm 0.3 MeV. The other experiments give
upper limits in the range 1 - 4 MeV.
|
[
{
"created": "Thu, 20 Nov 2003 01:12:41 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Cahn",
"Robert N.",
""
],
[
"Trilling",
"George H.",
""
]
] |
Using data on K^+ collisions on xenon and deuterium we derive values and limits on the width of the reported Theta(1540)^+ exotic baryon resonance. The xenon experiment gives a width of 0.9\pm 0.3 MeV. The other experiments give upper limits in the range 1 - 4 MeV.
|
hep-ph/0408078
|
Leonardo Campanelli
|
Leonardo Campanelli
|
Scattering of Dirac and Majorana Fermions off Domain Walls
|
6 pages, 1 figure, some typos corrected, one reference added, major
revisions, title changed, version accepted for publication in Phys. Rev. D
|
Phys.Rev. D70 (2004) 116008
|
10.1103/PhysRevD.70.116008
| null |
hep-ph
| null |
We investigate the interaction of fermions having both Dirac and left-handed
and right-handed Majorana mass terms with vacuum domain walls. By solving the
equations of motion in thin-wall approximation, we calculate the reflection and
transmission coefficients for the scattering of fermions off walls.
|
[
{
"created": "Thu, 5 Aug 2004 16:51:27 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Dec 2004 14:52:32 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Campanelli",
"Leonardo",
""
]
] |
We investigate the interaction of fermions having both Dirac and left-handed and right-handed Majorana mass terms with vacuum domain walls. By solving the equations of motion in thin-wall approximation, we calculate the reflection and transmission coefficients for the scattering of fermions off walls.
|
hep-ph/9603274
|
Kuang-Ta Chao
|
Cong-feng Qiao, Han-Wen Huang, Kuang-Ta Chao (Peking University)
|
Possible retardation effects of quark confinement on the meson spectrum
|
14 pages in LaTex form
|
Phys.Rev. D54 (1996) 2273-2278
|
10.1103/PhysRevD.54.2273
|
PUTP-95-23
|
hep-ph
| null |
The reduced Bethe-Salpeter equation with scalar confinement and vector gluon
exchange is applied to quark-antiquark bound states. The so called intrinsic
flaw of Salpeter equation with static scalar confinement is investigated. The
notorious problem of narrow level spacings is found to be remedied by taking
into consideration the retardation effect of scalar confinement. Good fit for
the mass spectrum of both heavy and light quarkomium states is then obtained.
|
[
{
"created": "Tue, 12 Mar 1996 04:27:06 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Qiao",
"Cong-feng",
"",
"Peking University"
],
[
"Huang",
"Han-Wen",
"",
"Peking University"
],
[
"Chao",
"Kuang-Ta",
"",
"Peking University"
]
] |
The reduced Bethe-Salpeter equation with scalar confinement and vector gluon exchange is applied to quark-antiquark bound states. The so called intrinsic flaw of Salpeter equation with static scalar confinement is investigated. The notorious problem of narrow level spacings is found to be remedied by taking into consideration the retardation effect of scalar confinement. Good fit for the mass spectrum of both heavy and light quarkomium states is then obtained.
|
2202.12476
|
Subhojit Roy
|
Arindam Chatterjee, AseshKrishna Datta and Subhojit Roy
|
Electroweak Phase Transition in the $Z_3$-invariant NMSSM: Implications
of LHC and Dark matter searches and prospects of detecting the gravitational
waves
|
52 pages, 3 figures, 6 tables. published version, references added
|
JHEP06(2022)108
|
10.1007/JHEP06(2022)108
|
HRI-RECAPP-2022-001
|
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We study in detail the viability and the patterns of a strong first-order
electroweak phase transition as a prerequisite to electroweak baryogenesis in
the framework of $Z_3$-invariant Next-to-Minimal Supersymmetric Standard Model
(NMSSM), in the light of recent experimental results from the Higgs sector,
dark matter (DM) searches and those from the searches of the lighter chargino
and neutralinos at the Large Hadron Collider (LHC). For the latter, we
undertake thorough recasts of the relevant, recent LHC analyses. With the help
of a few benchmark scenarios, we demonstrate that while the LHC has started to
eliminate regions of the parameter space with relatively small
$\mu_\mathrm{eff}$, that favors the coveted strong first-order phase
transition, rather steadily, there remains phenomenologically much involved and
compatible regions of the same which are yet not sensitive to the current LHC
analyses. It is further noted that such a region could also be compatible with
all pertinent theoretical and experimental constraints. We then proceed to
analyze the prospects of detecting the stochastic gravitational waves, which
are expected to arise from such a phase transition, at various future/proposed
experiments, within the mentioned theoretical framework and find them to be
somewhat ambitious under the currently projected sensitivities of those
experiments.
|
[
{
"created": "Fri, 25 Feb 2022 03:15:44 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2023 15:39:54 GMT",
"version": "v2"
}
] |
2023-05-17
|
[
[
"Chatterjee",
"Arindam",
""
],
[
"Datta",
"AseshKrishna",
""
],
[
"Roy",
"Subhojit",
""
]
] |
We study in detail the viability and the patterns of a strong first-order electroweak phase transition as a prerequisite to electroweak baryogenesis in the framework of $Z_3$-invariant Next-to-Minimal Supersymmetric Standard Model (NMSSM), in the light of recent experimental results from the Higgs sector, dark matter (DM) searches and those from the searches of the lighter chargino and neutralinos at the Large Hadron Collider (LHC). For the latter, we undertake thorough recasts of the relevant, recent LHC analyses. With the help of a few benchmark scenarios, we demonstrate that while the LHC has started to eliminate regions of the parameter space with relatively small $\mu_\mathrm{eff}$, that favors the coveted strong first-order phase transition, rather steadily, there remains phenomenologically much involved and compatible regions of the same which are yet not sensitive to the current LHC analyses. It is further noted that such a region could also be compatible with all pertinent theoretical and experimental constraints. We then proceed to analyze the prospects of detecting the stochastic gravitational waves, which are expected to arise from such a phase transition, at various future/proposed experiments, within the mentioned theoretical framework and find them to be somewhat ambitious under the currently projected sensitivities of those experiments.
|
1504.05813
|
Stefan Clementz
|
Mattias Blennow and Stefan Clementz
|
Asymmetric capture of Dirac dark matter by the Sun
|
22 pages, 5 figures, Version accepted for publication in JCAP. A
discussion regarding the distribution of captured DM added. Figure 4 added
under results. Minor corrections and references added
| null |
10.1088/1475-7516/2015/08/036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Current problems with the solar model may be alleviated if a significant
amount of dark matter from the galactic halo is captured in the Sun. We discuss
the capture process in the case where the dark matter is a Dirac fermion and
the background halo consists of equal amounts of dark matter and anti-dark
matter. By considering the case where dark matter and anti-dark matter have
different cross sections on solar nuclei as well as the case where the capture
process is considered to be a Poisson process, we find that a significant
asymmetry between the captured dark particles and anti-particles is possible
even for an annihilation cross section in the range expected for thermal relic
dark matter. Since the captured number of particles are competitive with
asymmetric dark matter models in a large range of parameter space, one may
expect solar physics to be altered by the capture of Dirac dark matter. It is
thus possible that solutions to the solar composition problem may be searched
for in these type of models.
|
[
{
"created": "Wed, 22 Apr 2015 14:09:20 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2015 11:30:25 GMT",
"version": "v2"
}
] |
2015-08-20
|
[
[
"Blennow",
"Mattias",
""
],
[
"Clementz",
"Stefan",
""
]
] |
Current problems with the solar model may be alleviated if a significant amount of dark matter from the galactic halo is captured in the Sun. We discuss the capture process in the case where the dark matter is a Dirac fermion and the background halo consists of equal amounts of dark matter and anti-dark matter. By considering the case where dark matter and anti-dark matter have different cross sections on solar nuclei as well as the case where the capture process is considered to be a Poisson process, we find that a significant asymmetry between the captured dark particles and anti-particles is possible even for an annihilation cross section in the range expected for thermal relic dark matter. Since the captured number of particles are competitive with asymmetric dark matter models in a large range of parameter space, one may expect solar physics to be altered by the capture of Dirac dark matter. It is thus possible that solutions to the solar composition problem may be searched for in these type of models.
|
hep-ph/9903358
|
Mark Wusthoff
|
K. Golec-Biernat, M. Wusthoff
|
Saturation in Diffractive Deep Inelastic Scattering
|
31 pages, 12 figures, replaced with the journal version. A missing
factor 1/2 in eq.(39) inserted
|
Phys.Rev.D60:114023,1999
|
10.1103/PhysRevD.60.114023
|
DTP/99/20
|
hep-ph
| null |
We successfully describe the HERA-data on diffractive deep inelastic
scattering using a saturation model which has been applied in our earlier
analysis of the inclusive $ep$-scattering data. No further parameters are
needed. Saturation already turned out to be essential in describing the
transition from large to small values of $Q^2$ in inclusive scattering. It is
even more important for diffractive processes and naturally leads to a constant
ratio of the diffractive versus inclusive cross sections. We present an
extensive discussion of our results as well as detailed comparison with data.
|
[
{
"created": "Mon, 15 Mar 1999 18:59:26 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Feb 2001 17:08:25 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Golec-Biernat",
"K.",
""
],
[
"Wusthoff",
"M.",
""
]
] |
We successfully describe the HERA-data on diffractive deep inelastic scattering using a saturation model which has been applied in our earlier analysis of the inclusive $ep$-scattering data. No further parameters are needed. Saturation already turned out to be essential in describing the transition from large to small values of $Q^2$ in inclusive scattering. It is even more important for diffractive processes and naturally leads to a constant ratio of the diffractive versus inclusive cross sections. We present an extensive discussion of our results as well as detailed comparison with data.
|
2307.00628
|
Wen Yin
|
Kai Murai and Wen Yin
|
A Novel Probe of Supersymmetry in Light of Nanohertz Gravitational Waves
|
17pages, 1 figure, 1 table, comments are welcome
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new era of exploring the early Universe may have begun with the recent
strong evidence for the stochastic gravitational wave (GW) background from the
data reported by NANOGrav, EPTA, PPTA, and CPTA. Inspired by this, we propose a
new potential source of stochastic GWs in the minimal supersymmetric standard
model (MSSM), which could be the theory at a very high energy scale. This
source is the "axion" field in the Higgs multiplets when the Higgs field takes
a large value along the D-flat direction in the early Universe, for example,
during inflation. The axion motion triggers the instability of the standard
model ${\rm U}(1)$ and/or ${\rm SU}(3)$ gauge fields, producing stochastic GWs
during the inflation. This scenario can be seen as a simple UV completion of
the commonly studied models where an axion spectator/inflaton is coupled to a
hidden ${\rm U}(1)$ or ${\rm SU}(N)$ gauge field without matter fields. Thus
the nanohertz GWs may be a sign of supersymmetry. Primordial magnetic field
production is also argued. In addition, we point out the simple possibility
that this axion within the MSSM drives inflation.
|
[
{
"created": "Sun, 2 Jul 2023 17:53:01 GMT",
"version": "v1"
}
] |
2023-07-04
|
[
[
"Murai",
"Kai",
""
],
[
"Yin",
"Wen",
""
]
] |
A new era of exploring the early Universe may have begun with the recent strong evidence for the stochastic gravitational wave (GW) background from the data reported by NANOGrav, EPTA, PPTA, and CPTA. Inspired by this, we propose a new potential source of stochastic GWs in the minimal supersymmetric standard model (MSSM), which could be the theory at a very high energy scale. This source is the "axion" field in the Higgs multiplets when the Higgs field takes a large value along the D-flat direction in the early Universe, for example, during inflation. The axion motion triggers the instability of the standard model ${\rm U}(1)$ and/or ${\rm SU}(3)$ gauge fields, producing stochastic GWs during the inflation. This scenario can be seen as a simple UV completion of the commonly studied models where an axion spectator/inflaton is coupled to a hidden ${\rm U}(1)$ or ${\rm SU}(N)$ gauge field without matter fields. Thus the nanohertz GWs may be a sign of supersymmetry. Primordial magnetic field production is also argued. In addition, we point out the simple possibility that this axion within the MSSM drives inflation.
|
1608.08575
|
Emanuele Roberto Nocera
|
Emanuele Nocera and Silvia Pisano
|
Summary of WG6: Spin Physics
|
10 pages, 5 figures, to appear in the proceedings of DIS2016
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The working group on Spin Physics at the XXIV International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2016) witnessed a
significant progress in the theoretical and experimental investigations aiming
at unveiling the innermost structure of the proton. Results ranged from
proton's one-dimensional representation to its multi-dimensional imaging. In
this contribution, we summarize a selection of the topics discussed and of the
results presented. For details, we refer to the individual contributions
collected in the proceedings of this workshop.
|
[
{
"created": "Tue, 30 Aug 2016 17:47:35 GMT",
"version": "v1"
}
] |
2016-08-31
|
[
[
"Nocera",
"Emanuele",
""
],
[
"Pisano",
"Silvia",
""
]
] |
The working group on Spin Physics at the XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2016) witnessed a significant progress in the theoretical and experimental investigations aiming at unveiling the innermost structure of the proton. Results ranged from proton's one-dimensional representation to its multi-dimensional imaging. In this contribution, we summarize a selection of the topics discussed and of the results presented. For details, we refer to the individual contributions collected in the proceedings of this workshop.
|
1907.10577
|
Peihong Gu
|
Pei-Hong Gu
|
Baryon asymmetry from left-right phase transition
|
6 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the standard model fermions by a mirror copy to realize a
left-right symmetry. During a strongly first order phase transition of the
spontaneous left-right symmetry breaking, the CP-violating reflections of the
mirror fermions off the mirror Higgs bubbles can generate a mirror lepton
asymmetry and an equal mirror baryon asymmetry. We then can obtain an ordinary
baryon asymmetry through the mirror fermion decays where a dark matter scalar
plays an essential role. Benefitted from a parity symmetry for solving the
strong CP problem, the cosmic baryon asymmetry can be well described by the
ordinary lepton mass matrices up to an overall factor. In this scenario, the
Dirac CP phase in the Majorana neutrino mass matrix can provide a unique source
for the required CP violation. Furthermore, the Higgs triplet for type-II
seesaw as well as the first generation of mirror charged fermions can be
allowed at the TeV scale.
|
[
{
"created": "Wed, 24 Jul 2019 17:28:26 GMT",
"version": "v1"
}
] |
2020-01-09
|
[
[
"Gu",
"Pei-Hong",
""
]
] |
We extend the standard model fermions by a mirror copy to realize a left-right symmetry. During a strongly first order phase transition of the spontaneous left-right symmetry breaking, the CP-violating reflections of the mirror fermions off the mirror Higgs bubbles can generate a mirror lepton asymmetry and an equal mirror baryon asymmetry. We then can obtain an ordinary baryon asymmetry through the mirror fermion decays where a dark matter scalar plays an essential role. Benefitted from a parity symmetry for solving the strong CP problem, the cosmic baryon asymmetry can be well described by the ordinary lepton mass matrices up to an overall factor. In this scenario, the Dirac CP phase in the Majorana neutrino mass matrix can provide a unique source for the required CP violation. Furthermore, the Higgs triplet for type-II seesaw as well as the first generation of mirror charged fermions can be allowed at the TeV scale.
|
hep-ph/9904241
|
Susanne Bielefeld
|
S. Bielefeld, J.Ihmels, and H.C. Pauli (MPI Kernphysik,Heidelberg)
|
On technically solving an effective QCD-Hamiltonian
|
9 pages, 24 eps-figures, macro svjour included
| null | null |
Heidelberg preprint MPIH-V11-1999
|
hep-ph
| null |
By their very nature, field-theoretical Hamiltonians are derived in momentum
representation. To solve the corresponding integro-differential equations is
more difficult than to solve the simpler differential equations in
configuration space (`Schr\"odinger equation'). For the latter many different
and very effective methods have been developed in the past. But rather than to
Fourier-transform to configuration space - which is not always easy - the
equations are solved here directly in momentum space, by using Gaussian
quadratures. Special attention is given to the case where the potential in
configuration space is linear and where the corresponding momentum-space kernel
has an almost intractable 1/(\vec k - \vec k')^4 -singularity. Its
regularization requires a certain technical effort, introducing suitable
counter terms. The method is numerically reliable and fast, faster than other
methods in the literature. It should be useful to and also applicable in other
approaches, including phenomenological Schr\"odinger-type equations.
|
[
{
"created": "Tue, 6 Apr 1999 13:31:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bielefeld",
"S.",
"",
"MPI Kernphysik,Heidelberg"
],
[
"Ihmels",
"J.",
"",
"MPI Kernphysik,Heidelberg"
],
[
"Pauli",
"H. C.",
"",
"MPI Kernphysik,Heidelberg"
]
] |
By their very nature, field-theoretical Hamiltonians are derived in momentum representation. To solve the corresponding integro-differential equations is more difficult than to solve the simpler differential equations in configuration space (`Schr\"odinger equation'). For the latter many different and very effective methods have been developed in the past. But rather than to Fourier-transform to configuration space - which is not always easy - the equations are solved here directly in momentum space, by using Gaussian quadratures. Special attention is given to the case where the potential in configuration space is linear and where the corresponding momentum-space kernel has an almost intractable 1/(\vec k - \vec k')^4 -singularity. Its regularization requires a certain technical effort, introducing suitable counter terms. The method is numerically reliable and fast, faster than other methods in the literature. It should be useful to and also applicable in other approaches, including phenomenological Schr\"odinger-type equations.
|
0803.0813
|
Fernand Renard M
|
G.J. Gounaris, J. Layssac, F.M. Renard
|
Genuine SUSY signatures from $ug\to \tilde d \tchi_i^+$ and $ug \to d
W^+$, at high energies
|
19 pages, 10 figures, version to appear in Phys.Rev.D
|
Phys.Rev.D77:093007,2008
|
10.1103/PhysRevD.77.093007
|
PTA/08-009
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the quark-gluon induced process $u g\to \tilde d\tchi_i^+$,
including the one loop electroweak (EW) effects in the minimal supersymmetric
model (MSSM). This process is determined by four helicity amplitudes, three of
which are violating helicity conservation, and another one which respects it
and is logarithmically enhanced at high energy. Combining this $u g\to \tilde
d\tchi_i^+$ analysis with a corresponding one for $u g \to d W^+$, we obtain
simple approximate relations between the two processes, testing the MSSM
structure at the amplitude and the cross section levels. These relations become
exact at asymptotic energies and, provided the SUSY scale is not too heavy,
they may be approximately correct at LHC energies also. In addition to these,
we study the 1loop EW corrections to the inclusive $\tilde d\tchi_i^+$
production at LHC, presenting as examples, the $p_T$ and angular distributions.
Comparing these to the corresponding predictions for $W$+jet production derived
earlier, provides an accurate test of the supersymmetric assignments.
|
[
{
"created": "Thu, 6 Mar 2008 08:13:40 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Apr 2008 08:45:48 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Gounaris",
"G. J.",
""
],
[
"Layssac",
"J.",
""
],
[
"Renard",
"F. M.",
""
]
] |
We analyze the quark-gluon induced process $u g\to \tilde d\tchi_i^+$, including the one loop electroweak (EW) effects in the minimal supersymmetric model (MSSM). This process is determined by four helicity amplitudes, three of which are violating helicity conservation, and another one which respects it and is logarithmically enhanced at high energy. Combining this $u g\to \tilde d\tchi_i^+$ analysis with a corresponding one for $u g \to d W^+$, we obtain simple approximate relations between the two processes, testing the MSSM structure at the amplitude and the cross section levels. These relations become exact at asymptotic energies and, provided the SUSY scale is not too heavy, they may be approximately correct at LHC energies also. In addition to these, we study the 1loop EW corrections to the inclusive $\tilde d\tchi_i^+$ production at LHC, presenting as examples, the $p_T$ and angular distributions. Comparing these to the corresponding predictions for $W$+jet production derived earlier, provides an accurate test of the supersymmetric assignments.
|
1102.3432
|
Werner Rodejohann
|
Hans Hettmansperger, Manfred Lindner, Werner Rodejohann
|
Phenomenological Consequences of sub-leading Terms in See-Saw Formulas
|
22 pages, matches published version
|
JHEP 1104:123,2011
|
10.1007/JHEP04(2011)123
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several aspects of next-to-leading (NLO) order corrections to see-saw
formulas are discussed and phenomenologically relevant situations are
identified. We generalize the formalism to calculate the NLO terms developed
for the type I see-saw to variants like the inverse, double or linear see-saw,
i.e., to cases in which more than two mass scales are present. In the standard
type I case with very heavy fermion singlets the sub-leading terms are
negligible. However, effects in the percent regime are possible when
sub-matrices of the complete neutral fermion mass matrix obey a moderate
hierarchy, e.g. weak scale and TeV scale. Examples are cancellations of large
terms leading to small neutrino masses, or inverse see-saw scenarios. We
furthermore identify situations in which no NLO corrections to certain
observables arise, namely for mu-tau symmetry and cases with a vanishing
neutrino mass. Finally, we emphasize that the unavoidable unitarity violation
in see-saw scenarios with extra fermions can be calculated with the formalism
in a straightforward manner.
|
[
{
"created": "Wed, 16 Feb 2011 21:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2011 06:58:56 GMT",
"version": "v2"
}
] |
2011-05-05
|
[
[
"Hettmansperger",
"Hans",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Rodejohann",
"Werner",
""
]
] |
Several aspects of next-to-leading (NLO) order corrections to see-saw formulas are discussed and phenomenologically relevant situations are identified. We generalize the formalism to calculate the NLO terms developed for the type I see-saw to variants like the inverse, double or linear see-saw, i.e., to cases in which more than two mass scales are present. In the standard type I case with very heavy fermion singlets the sub-leading terms are negligible. However, effects in the percent regime are possible when sub-matrices of the complete neutral fermion mass matrix obey a moderate hierarchy, e.g. weak scale and TeV scale. Examples are cancellations of large terms leading to small neutrino masses, or inverse see-saw scenarios. We furthermore identify situations in which no NLO corrections to certain observables arise, namely for mu-tau symmetry and cases with a vanishing neutrino mass. Finally, we emphasize that the unavoidable unitarity violation in see-saw scenarios with extra fermions can be calculated with the formalism in a straightforward manner.
|
hep-ph/9807205
| null |
J.I. Illana (Institut f\"ur Theoretische Physik, Karlsruhe)
|
Dipole Moments in Supersymmetry
|
8 pages, 2 figures. LaTeX using appb.sty (included) and epsf.sty.
Contribution to the Zeuthen Workshop on Elementary Particle Physics "Loops
and Legs in Gauge Theories", Rheinsberg, April 19-24, 1998. Typo in Eq. (5b)
corrected. The complete ps-file is also available via WWW at
http://www-itp.physik.uni-karlsruhe.de/prep/prep.html
|
Acta Phys.Polon. B29 (1998) 2753-2761
| null |
KA-TP-9-1998
|
hep-ph
| null |
The one-loop MSSM contributions to the weak dipole moments of the \tau lepton
and the b quark (at the Z peak) as well as the electromagnetic and weak dipole
form factors of the t quark (at arbitrary s>4m^2_t) are reviewed. Emphasis is
given to the relevance of the t-quark CP-violating weak and electric dipole
form factors as a part of the full one-loop correction to the process e^+e^-
--> t \bar{t} in the MSSM.
|
[
{
"created": "Wed, 1 Jul 1998 08:35:18 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 1998 17:23:40 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Illana",
"J. I.",
"",
"Institut für Theoretische Physik, Karlsruhe"
]
] |
The one-loop MSSM contributions to the weak dipole moments of the \tau lepton and the b quark (at the Z peak) as well as the electromagnetic and weak dipole form factors of the t quark (at arbitrary s>4m^2_t) are reviewed. Emphasis is given to the relevance of the t-quark CP-violating weak and electric dipole form factors as a part of the full one-loop correction to the process e^+e^- --> t \bar{t} in the MSSM.
|
2311.13068
|
Jesus Rendon
|
Alejandro Ayala, Ricardo L. S. Farias, L. A. Hern\'andez, Ana Julia
Mizher, Javier Rend\'on, Cristian Villavicencio and R. Zamora
|
Magnetic field dependence of the neutral pion longitudinal screening
mass in the linear sigma model with quarks
|
15 pages, 10 figures. arXiv admin note: text overlap with
arXiv:2011.03673
|
Phys. Rev. D 109, 074019 (2024)
|
10.1103/PhysRevD.109.074019
| null |
hep-ph hep-lat nucl-th
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We use the linear sigma model with quarks to study the magnetic-field-induced
modifications on the longitudinal screening mass for the neutral pion at
one-loop level. The effects of the magnetic field are introduced into the
self-energy, which contains the contributions from all the model particles. We
find that, to obtain a reasonable description for the behavior with the field
strength, we need to account for the magnetic field dependence of the particle
masses. We also find that the couplings need to decrease fast enough with the
field strength to then reach constant and smaller values as compared to their
vacuum ones. The results illustrate the need to treat the magnetic corrections
to the particle masses and couplings in a self-consistent manner, accounting
for the backreaction of the field effects for the magnetic field dependence of
the rest of the particle species and couplings in the model.
|
[
{
"created": "Wed, 22 Nov 2023 00:01:38 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2024 03:00:34 GMT",
"version": "v2"
}
] |
2024-04-24
|
[
[
"Ayala",
"Alejandro",
""
],
[
"Farias",
"Ricardo L. S.",
""
],
[
"Hernández",
"L. A.",
""
],
[
"Mizher",
"Ana Julia",
""
],
[
"Rendón",
"Javier",
""
],
[
"Villavicencio",
"Cristian",
""
],
[
"Zamora",
"R.",
""
]
] |
We use the linear sigma model with quarks to study the magnetic-field-induced modifications on the longitudinal screening mass for the neutral pion at one-loop level. The effects of the magnetic field are introduced into the self-energy, which contains the contributions from all the model particles. We find that, to obtain a reasonable description for the behavior with the field strength, we need to account for the magnetic field dependence of the particle masses. We also find that the couplings need to decrease fast enough with the field strength to then reach constant and smaller values as compared to their vacuum ones. The results illustrate the need to treat the magnetic corrections to the particle masses and couplings in a self-consistent manner, accounting for the backreaction of the field effects for the magnetic field dependence of the rest of the particle species and couplings in the model.
|
hep-ph/9810330
|
Johann Rafelski
|
Johann Rafelski (Department of Physics, University of Arizona, Tucson,
AZ)
|
Quo Vadis Strangeness? Strangeness - Open Questions
|
20pages including 5 figures in J.Phys format, Summary talk presented
at the International Conference Strangeness in Quark Matter held in Padova,
July 1998 v2 comprises more technical details
|
J.Phys.G25:451-468,1999
|
10.1088/0954-3899/25/2/035
| null |
hep-ph
| null |
The study of strange and also charmed hadronic particle production in nuclear
relativistic collisions offers an opportunity to explore the physical
properties of the deconfined quark-gluon phase. We survey the recent
accomplishments and the future directions of this research program.
|
[
{
"created": "Mon, 12 Oct 1998 17:02:15 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 1998 01:00:23 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Rafelski",
"Johann",
"",
"Department of Physics, University of Arizona, Tucson,\n AZ"
]
] |
The study of strange and also charmed hadronic particle production in nuclear relativistic collisions offers an opportunity to explore the physical properties of the deconfined quark-gluon phase. We survey the recent accomplishments and the future directions of this research program.
|
1006.0913
|
James P. Kneller
|
James P. Kneller, Cristina Volpe
|
Turbulence effects on supernova neutrinos
|
New figure added
|
Phys.Rev.D82:123004,2010
|
10.1103/PhysRevD.82.123004
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Multi-dimensional core-collapse supernova simulations exhibit turbulence of
large amplitude and over large scales. As neutrinos pass through the supernova
mantle the turbulence is expected to modify their evolution compared to the
case where the explosion is free of turbulence. In this paper we study this
turbulence effect upon the neutrinos modelling the turbulence expected from
multi-dimensional simulations by adding matter density fluctuations to density
profiles taken from one-dimensional hydrodynamical simulations. We investigate
the impact upon the supernova neutrino transition probabilities as a function
of the neutrino mixing angle theta_13 and turbulence amplitude. In the high (H)
resonant channel and with large theta_13 values we find that turbulence is
effectively two flavor for fluctuation amplitudes <~ 1% and have identified a
new effect due to the combination of turbulence and multiple H resonances that
leads to a sensitivity to fluctuations amplitudes as small as ~ 0.001%. At
small values of theta_13, beyond the range achievable in Earth based
experiments, we find that turbulence leads to new flavor transient effects in
the channel where the MSW H resonance occurs. Finally, we investigate large
amplitude fluctuations which lead to three flavor effects due to broken HL
factorization and significant non-resonant transitions and identify two
non-resonant turbulence effects, one depending on the theta_13, and the other
independent of this angle and due to the low (L) MSW resonance.
|
[
{
"created": "Fri, 4 Jun 2010 14:44:56 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 2010 20:28:39 GMT",
"version": "v2"
}
] |
2010-12-24
|
[
[
"Kneller",
"James P.",
""
],
[
"Volpe",
"Cristina",
""
]
] |
Multi-dimensional core-collapse supernova simulations exhibit turbulence of large amplitude and over large scales. As neutrinos pass through the supernova mantle the turbulence is expected to modify their evolution compared to the case where the explosion is free of turbulence. In this paper we study this turbulence effect upon the neutrinos modelling the turbulence expected from multi-dimensional simulations by adding matter density fluctuations to density profiles taken from one-dimensional hydrodynamical simulations. We investigate the impact upon the supernova neutrino transition probabilities as a function of the neutrino mixing angle theta_13 and turbulence amplitude. In the high (H) resonant channel and with large theta_13 values we find that turbulence is effectively two flavor for fluctuation amplitudes <~ 1% and have identified a new effect due to the combination of turbulence and multiple H resonances that leads to a sensitivity to fluctuations amplitudes as small as ~ 0.001%. At small values of theta_13, beyond the range achievable in Earth based experiments, we find that turbulence leads to new flavor transient effects in the channel where the MSW H resonance occurs. Finally, we investigate large amplitude fluctuations which lead to three flavor effects due to broken HL factorization and significant non-resonant transitions and identify two non-resonant turbulence effects, one depending on the theta_13, and the other independent of this angle and due to the low (L) MSW resonance.
|
hep-ph/0406281
|
Glennys R. Farrar
|
Glennys R. Farrar and Gabrijela Zaharijas
|
Dark Matter and the Baryon Asymmetry of the Universe
|
4 pp. Added references and corrected typos
|
Phys.Rev.Lett. 96 (2006) 041302
| null | null |
hep-ph astro-ph
| null |
We present a mechanism to generate the baryon asymmetry of the Universe which
preserves the net baryon number created in the Big Bang. If dark matter
particles carry baryon number $B_X$, and $\sigma^{\rm annih}_{\bar{X}} <
\sigma^{\rm annih}_{X} $, the $\bar{X}$'s freeze out at a higher temperature
and have a larger relic density than $X$'s. If $m_X \lsi 4.5 B_X $GeV and the
annihilation cross sections differ by $\gsi 10%$, this type of scenario
naturally explains the observed $\Omega_{DM} \approx 5 \Omega_b$.
|
[
{
"created": "Thu, 24 Jun 2004 22:13:37 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jun 2004 16:54:42 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Jul 2004 18:23:22 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Farrar",
"Glennys R.",
""
],
[
"Zaharijas",
"Gabrijela",
""
]
] |
We present a mechanism to generate the baryon asymmetry of the Universe which preserves the net baryon number created in the Big Bang. If dark matter particles carry baryon number $B_X$, and $\sigma^{\rm annih}_{\bar{X}} < \sigma^{\rm annih}_{X} $, the $\bar{X}$'s freeze out at a higher temperature and have a larger relic density than $X$'s. If $m_X \lsi 4.5 B_X $GeV and the annihilation cross sections differ by $\gsi 10%$, this type of scenario naturally explains the observed $\Omega_{DM} \approx 5 \Omega_b$.
|
2105.06880
|
Gong-Ming Yu
|
Gongming Yu, Yanbing Cai, Yongping Fu, Haitao Yang, Quangui Gao, Qiang
Hu, Liyuan Hu, Wei Li, Yushou Song
|
Coherent photoproduction of low-$p_{T}$ charmonium in peripheral heavy
ion collisions within the color dipole model
|
4 pages, 1 figure
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We calculate the centrality dependence for coherent photoproduction of very
low-$p_{T}$ $J/\psi$ at Relativistic Heavy Ion Collider (RHIC) and Large Hadron
Collider (LHC) energies within the impact parameter dependent saturated color
dipole model. By using the large equivalent photon fluxes, we present the
differential cross section of very low-$p_{T}$ $J/\psi$ produced by coherent
photonuclear in peripheral heavy-ion collisions. The numerical results
demonstrate that our calculation are agree with $J/\psi$ data in peripheral
heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) energies.
|
[
{
"created": "Fri, 14 May 2021 15:08:49 GMT",
"version": "v1"
}
] |
2021-05-17
|
[
[
"Yu",
"Gongming",
""
],
[
"Cai",
"Yanbing",
""
],
[
"Fu",
"Yongping",
""
],
[
"Yang",
"Haitao",
""
],
[
"Gao",
"Quangui",
""
],
[
"Hu",
"Qiang",
""
],
[
"Hu",
"Liyuan",
""
],
[
"Li",
"Wei",
""
],
[
"Song",
"Yushou",
""
]
] |
We calculate the centrality dependence for coherent photoproduction of very low-$p_{T}$ $J/\psi$ at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies within the impact parameter dependent saturated color dipole model. By using the large equivalent photon fluxes, we present the differential cross section of very low-$p_{T}$ $J/\psi$ produced by coherent photonuclear in peripheral heavy-ion collisions. The numerical results demonstrate that our calculation are agree with $J/\psi$ data in peripheral heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) energies.
|
2009.05195
|
Javier Monta\~no Dom\'inguez
|
J. I. Aranda, T. Cisneros-P\'erez, J. Monta\~no, B. Quezadas-Vivian,
F. Ram\'irez-Zavaleta, and E. S. Tututi
|
Revisiting the top quark chromomagnetic dipole moment in the SM
|
20 pages, 4 figures, this version matches with the published one
| null |
10.1140/epjp/s13360-021-01102-x
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the anomalous chromomagnetic dipole moment in the Standard Model
and show that its triple gluon vertex contribution, with the on-shell gluon
($q^2=0$), generates an infrared divergent pole. Consequently, the
chromomagnetic dipole should not be perturbatively evaluated at $q^2=0$.
Focusing on this top quark anomaly, denoted as $\hat{\mu}_t(q^2)$, we compute
it with the off-shell gluon with a large momentum transfer, just as the
$\alpha_s(m_Z^2)$ convention scale, for both spacelike $q^2=-m_Z^2$ and
timelike $q^2=m_Z^2$ cases. We found that $\hat{\mu}_t(-m_Z^2)$ $=$ $-0.0224$
$-0.000925i$ and $\hat{\mu}_t(m_Z^2)$ $=$ $-0.0133$ $-0.0267i$. Our
$\mathrm{Re}\thinspace\hat{\mu}_t(-m_Z^2)$ matches well with the current
experimental value
$\hat{\mu}_t^\mathrm{Exp}=-0.024_{-0.009}^{+0.013}(\mathrm{stat})_{-0.011}^{+0.016}(\mathrm{syst})$,
and the $\mathrm{Im}\thinspace\hat{\mu}_t(-m_Z^2)$ part is induced by flavour
changing charged currents.
|
[
{
"created": "Fri, 11 Sep 2020 01:33:16 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jan 2021 18:14:49 GMT",
"version": "v2"
}
] |
2021-01-26
|
[
[
"Aranda",
"J. I.",
""
],
[
"Cisneros-Pérez",
"T.",
""
],
[
"Montaño",
"J.",
""
],
[
"Quezadas-Vivian",
"B.",
""
],
[
"Ramírez-Zavaleta",
"F.",
""
],
[
"Tututi",
"E. S.",
""
]
] |
We revisit the anomalous chromomagnetic dipole moment in the Standard Model and show that its triple gluon vertex contribution, with the on-shell gluon ($q^2=0$), generates an infrared divergent pole. Consequently, the chromomagnetic dipole should not be perturbatively evaluated at $q^2=0$. Focusing on this top quark anomaly, denoted as $\hat{\mu}_t(q^2)$, we compute it with the off-shell gluon with a large momentum transfer, just as the $\alpha_s(m_Z^2)$ convention scale, for both spacelike $q^2=-m_Z^2$ and timelike $q^2=m_Z^2$ cases. We found that $\hat{\mu}_t(-m_Z^2)$ $=$ $-0.0224$ $-0.000925i$ and $\hat{\mu}_t(m_Z^2)$ $=$ $-0.0133$ $-0.0267i$. Our $\mathrm{Re}\thinspace\hat{\mu}_t(-m_Z^2)$ matches well with the current experimental value $\hat{\mu}_t^\mathrm{Exp}=-0.024_{-0.009}^{+0.013}(\mathrm{stat})_{-0.011}^{+0.016}(\mathrm{syst})$, and the $\mathrm{Im}\thinspace\hat{\mu}_t(-m_Z^2)$ part is induced by flavour changing charged currents.
|
1810.07349
|
So Chigusa
|
So Chigusa, Yohei Ema, Takeo Moroi
|
Probing Electroweakly Interacting Massive Particles with Drell-Yan
Process at 100 TeV Hadron Colliders
|
17 pages, 4 figures, 1 table
| null |
10.1016/j.physletb.2018.12.011
|
UT-18-24, KEK-TH-2083, DESY 18-180
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There are many models beyond the standard model which include electroweakly
interacting massive particles (EWIMPs), often in the context of the dark
matter. In this paper, we study the indirect search of EWIMPs using a precise
measurement of the Drell-Yan cross sections at future $100\,{\rm TeV}$ hadron
colliders. It is revealed that this search strategy is suitable in particular
for Higgsino and that the Higgsino mass up to about $1.3\,{\rm TeV}$ will be
covered at $95\,\%$ C.L. irrespective of the chargino and neutralino mass
difference. We also show that the study of the Drell-Yan process provides
important and independent information about every kind of EWIMP in addition to
Higgsino.
|
[
{
"created": "Wed, 17 Oct 2018 01:43:58 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Feb 2019 09:42:44 GMT",
"version": "v2"
}
] |
2019-02-19
|
[
[
"Chigusa",
"So",
""
],
[
"Ema",
"Yohei",
""
],
[
"Moroi",
"Takeo",
""
]
] |
There are many models beyond the standard model which include electroweakly interacting massive particles (EWIMPs), often in the context of the dark matter. In this paper, we study the indirect search of EWIMPs using a precise measurement of the Drell-Yan cross sections at future $100\,{\rm TeV}$ hadron colliders. It is revealed that this search strategy is suitable in particular for Higgsino and that the Higgsino mass up to about $1.3\,{\rm TeV}$ will be covered at $95\,\%$ C.L. irrespective of the chargino and neutralino mass difference. We also show that the study of the Drell-Yan process provides important and independent information about every kind of EWIMP in addition to Higgsino.
|
hep-ph/0102308
|
Leszek Roszkowski
|
Takeshi Nihei, Leszek Roszkowski and Roberto Ruiz de Austri
|
Towards An Accurate Calculation of the Neutralino Relic Density
|
23 pages, 4 eps figures
|
JHEP 0105:063,2001
|
10.1088/1126-6708/2001/05/063
| null |
hep-ph astro-ph
| null |
We compute the neutralino relic density in the minimal supersymmetric
standard model by using exact expressions for the neutralino annihilation cross
section into all tree-level final states, including all contributions and
interference terms. We find that several final states may give comparable
contributions to the relic density, which illustrates the importance of
performing a complete calculation. We compare the exact results with those of
the usual expansion method and demonstrate a sizeable discrepancy (of more than
10%) over a significant range of the neutralino mass of up to several tens of
GeV which is caused by the presence of resonances and new final-state
thresholds. We perform several related checks and comparisons. In particular,
we find that the often employed approximate iterative procedure of computing
the neutralino freeze-out temperature gives generally very accurate results,
except when the expansion method is used near resonances and thresholds.
|
[
{
"created": "Sun, 25 Feb 2001 22:10:58 GMT",
"version": "v1"
}
] |
2010-02-03
|
[
[
"Nihei",
"Takeshi",
""
],
[
"Roszkowski",
"Leszek",
""
],
[
"de Austri",
"Roberto Ruiz",
""
]
] |
We compute the neutralino relic density in the minimal supersymmetric standard model by using exact expressions for the neutralino annihilation cross section into all tree-level final states, including all contributions and interference terms. We find that several final states may give comparable contributions to the relic density, which illustrates the importance of performing a complete calculation. We compare the exact results with those of the usual expansion method and demonstrate a sizeable discrepancy (of more than 10%) over a significant range of the neutralino mass of up to several tens of GeV which is caused by the presence of resonances and new final-state thresholds. We perform several related checks and comparisons. In particular, we find that the often employed approximate iterative procedure of computing the neutralino freeze-out temperature gives generally very accurate results, except when the expansion method is used near resonances and thresholds.
|
1210.5059
|
Gabriel Abelof
|
Gabriel Abelof (1), Aude Gehrmann-De Ridder (1), Oliver Dekkers (2)
((1) Institute for Theoretical Physics, ETH Z\"urich, (2) Institut f\"ur
Theoretische Teilchenphysik und Kosmologie, Aachen University)
|
Antenna subtraction with massive fermions at NNLO: Double real
initial-final configurations
|
24 pages, 1 figure, 1 Mathematica file attached
| null |
10.1007/JHEP12(2012)107
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the integrated forms of specific initial-final tree-level
four-parton antenna functions involving a massless initial-state parton and a
massive final-state fermion as hard radiators. These antennae are needed in the
subtraction terms required to evaluate the double real corrections to
$t\bar{t}$ hadronic production at the NNLO level stemming from the partonic
processes $q\bar{q}\to t\bar{t}q'\bar{q}'$ and $gg\to t\bar{t}q\bar{q}$.
|
[
{
"created": "Thu, 18 Oct 2012 09:08:18 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Abelof",
"Gabriel",
""
],
[
"Ridder",
"Aude Gehrmann-De",
""
],
[
"Dekkers",
"Oliver",
""
]
] |
We derive the integrated forms of specific initial-final tree-level four-parton antenna functions involving a massless initial-state parton and a massive final-state fermion as hard radiators. These antennae are needed in the subtraction terms required to evaluate the double real corrections to $t\bar{t}$ hadronic production at the NNLO level stemming from the partonic processes $q\bar{q}\to t\bar{t}q'\bar{q}'$ and $gg\to t\bar{t}q\bar{q}$.
|
hep-ph/9908412
|
Oleg Teryaev
|
A. Schaefer and O. V. Teryaev
|
Sum rules for the T-odd fragmentation functions
|
LATEX, 5 pages; Phys. Rev. D61 (2000) 077903
|
Phys.Rev. D61 (2000) 077903
|
10.1103/PhysRevD.61.077903
| null |
hep-ph
| null |
The conservation of the intrinsic transverse momentum during parton
fragmentation imposes non-trivial constraints on T-odd fragmentation functions.
These significantly enhance the differences between the favoured and unfavoured
fragmentation functions, which could be relevant to understand the azimuthal
asymmetries of charged pion production observed recently by the HERMES
collaboration.
|
[
{
"created": "Thu, 19 Aug 1999 13:26:04 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Sep 1999 13:56:47 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Mar 2000 19:40:24 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Schaefer",
"A.",
""
],
[
"Teryaev",
"O. V.",
""
]
] |
The conservation of the intrinsic transverse momentum during parton fragmentation imposes non-trivial constraints on T-odd fragmentation functions. These significantly enhance the differences between the favoured and unfavoured fragmentation functions, which could be relevant to understand the azimuthal asymmetries of charged pion production observed recently by the HERMES collaboration.
|
1311.6154
|
Michal Petran
|
Michal Petran
|
Strangeness and charm in quark-gluon hadronization
|
143 pages
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This dissertation presents a theoretical study of soft hadron production in
relativistic heavy-ion collisions. We explore the principles governing the
hadronization of the expanding QGP fireball, and to understand its properties.
Much of the ongoing effort is to demonstrate the validity of a QGP
hadronization model which describes the particle production data accurately. We
begin with a centrality study of multistrange hadrons from Au-Au collisions at
62.4 GeV at RHIC. We show that the statistical hadronization model (SHM) well
describes particle production in QGP hadronization. For all centralities, the
physical properties are compatible with the earlier proposed critical
hadronization pressure suggesting universal hadronization conditions of QGP.
Heavy-ion collisions at LHC present a new challenge for SHM in describing
particle production at TeV energy scales. We show that the chemical
non-equilibrium model gives a good description of the hadron production in
Pb--Pb collisions at 2.76 TeV consistently as a function of centrality.
Moreover, the model parameters assume expected values suggested by previous
studies at lower energies. The quark-gluon plasma fireball hadronizes at the
same universal hadronization conditions, that is a common critical pressure,
entropy and energy density.
At LHC energies, a significant amount of charm is expected to be produced and
it is therefore crucial to incorporate charm into the present description of
particle production. We present an upgraded SHARE with CHARM program, that
quantifies the effect of charm on the yield of lighter hadrons and physical
properties of the hadronizing fireball. In addition to light flavors ($u,d,s$),
SHARE with CHARM describes charm hadron production and decays. We observe, that
according to present experimental results, charm decays mainly affect the
yields of multistrange particles.
|
[
{
"created": "Sun, 24 Nov 2013 19:03:50 GMT",
"version": "v1"
}
] |
2013-11-26
|
[
[
"Petran",
"Michal",
""
]
] |
This dissertation presents a theoretical study of soft hadron production in relativistic heavy-ion collisions. We explore the principles governing the hadronization of the expanding QGP fireball, and to understand its properties. Much of the ongoing effort is to demonstrate the validity of a QGP hadronization model which describes the particle production data accurately. We begin with a centrality study of multistrange hadrons from Au-Au collisions at 62.4 GeV at RHIC. We show that the statistical hadronization model (SHM) well describes particle production in QGP hadronization. For all centralities, the physical properties are compatible with the earlier proposed critical hadronization pressure suggesting universal hadronization conditions of QGP. Heavy-ion collisions at LHC present a new challenge for SHM in describing particle production at TeV energy scales. We show that the chemical non-equilibrium model gives a good description of the hadron production in Pb--Pb collisions at 2.76 TeV consistently as a function of centrality. Moreover, the model parameters assume expected values suggested by previous studies at lower energies. The quark-gluon plasma fireball hadronizes at the same universal hadronization conditions, that is a common critical pressure, entropy and energy density. At LHC energies, a significant amount of charm is expected to be produced and it is therefore crucial to incorporate charm into the present description of particle production. We present an upgraded SHARE with CHARM program, that quantifies the effect of charm on the yield of lighter hadrons and physical properties of the hadronizing fireball. In addition to light flavors ($u,d,s$), SHARE with CHARM describes charm hadron production and decays. We observe, that according to present experimental results, charm decays mainly affect the yields of multistrange particles.
|
1604.05319
|
Michael Duerr
|
Michael Duerr, Pavel Fileviez Perez, Juri Smirnov
|
New Forces and the 750 GeV Resonance
|
19 pages, 6 figures
| null | null |
DESY 16-070
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Recently, the ATLAS and CMS collaborations have pointed out the possible
existence of a new resonance with a mass around 750 GeV. We investigate the
possibility to identify this new resonance with a spin zero field responsible
for the breaking of a new gauge symmetry. We focus on a simple theory where the
baryon number is a local symmetry spontaneously broken at the low scale. In
this context new vector-like quarks are needed to cancel all baryonic anomalies
and define the production mechanism and decays of the new Higgs at the LHC.
Assuming the existence of the new Higgs with a mass of 750 GeV at the LHC we
find an upper bound on the symmetry breaking scale. Therefore, one expects that
a new force associated with baryon number could be discovered at the LHC.
|
[
{
"created": "Mon, 18 Apr 2016 20:00:06 GMT",
"version": "v1"
}
] |
2016-04-21
|
[
[
"Duerr",
"Michael",
""
],
[
"Perez",
"Pavel Fileviez",
""
],
[
"Smirnov",
"Juri",
""
]
] |
Recently, the ATLAS and CMS collaborations have pointed out the possible existence of a new resonance with a mass around 750 GeV. We investigate the possibility to identify this new resonance with a spin zero field responsible for the breaking of a new gauge symmetry. We focus on a simple theory where the baryon number is a local symmetry spontaneously broken at the low scale. In this context new vector-like quarks are needed to cancel all baryonic anomalies and define the production mechanism and decays of the new Higgs at the LHC. Assuming the existence of the new Higgs with a mass of 750 GeV at the LHC we find an upper bound on the symmetry breaking scale. Therefore, one expects that a new force associated with baryon number could be discovered at the LHC.
|
1905.05031
|
Simon King
|
Luigi Delle Rose, Shaaban Khalil, Simon J.D. King, Stefano Moretti,
Ahmed M. Thabt
|
${}^8$Be Decay Anomaly and Light $Z'$
|
Prepared for the 2019 EW session of the 54th Rencontres de Moriond,
talk presented by Simon King
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this proceedings, we discuss a light (17 MeV) $Z'$ solution to the anomaly
observed in the decay of Beryllium-8 by the Atomki collaboration. We detail an
anomaly free model with minimal particle content which can satisfy all other
experimental constraints with gauge couplings $\mathcal{O}(10^{-4})$.
|
[
{
"created": "Mon, 13 May 2019 13:35:48 GMT",
"version": "v1"
}
] |
2019-05-14
|
[
[
"Rose",
"Luigi Delle",
""
],
[
"Khalil",
"Shaaban",
""
],
[
"King",
"Simon J. D.",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Thabt",
"Ahmed M.",
""
]
] |
In this proceedings, we discuss a light (17 MeV) $Z'$ solution to the anomaly observed in the decay of Beryllium-8 by the Atomki collaboration. We detail an anomaly free model with minimal particle content which can satisfy all other experimental constraints with gauge couplings $\mathcal{O}(10^{-4})$.
|
1611.01925
|
Marco Bonvini
|
Marco Bonvini
|
Resummations in PDF fits
|
5 pages. Contribution to the proceedings of DIS 2016
|
PoS(DIS2016)030
| null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this contribution I discuss recent and ongoing progress on the inclusion
of resummation effects in the fit of parton distributions.
|
[
{
"created": "Mon, 7 Nov 2016 07:51:44 GMT",
"version": "v1"
}
] |
2016-11-08
|
[
[
"Bonvini",
"Marco",
""
]
] |
In this contribution I discuss recent and ongoing progress on the inclusion of resummation effects in the fit of parton distributions.
|
1007.4067
|
G\'abor Somogyi
|
G\'abor Somogyi, Paolo Bolzoni and Zolt\'an Tr\'ocs\'anyi
|
NNLO jet cross sections by subtraction
|
Talk presented at Loop and Legs in Quantum Field Theory, W\"{o}rlitz,
Germany, 25th-30th April 2010
|
Nucl.Phys.Proc.Suppl.205-206:42-47,2010
|
10.1016/j.nuclphysbps.2010.08.017
|
DESY 10-096
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on the computation of a class of integrals that appear when
integrating the so-called iterated singly-unresolved approximate cross section
of the NNLO subtraction scheme of [1-4], over the factorised phase space of
unresolved partons. The integrated approximate cross section itself can be
written as the product of an insertion operator (in colour space) times the
Born cross section. We give selected results for the insertion operator for
processes with two and three hard partons in the final state.
|
[
{
"created": "Fri, 23 Jul 2010 08:33:43 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Somogyi",
"Gábor",
""
],
[
"Bolzoni",
"Paolo",
""
],
[
"Trócsányi",
"Zoltán",
""
]
] |
We report on the computation of a class of integrals that appear when integrating the so-called iterated singly-unresolved approximate cross section of the NNLO subtraction scheme of [1-4], over the factorised phase space of unresolved partons. The integrated approximate cross section itself can be written as the product of an insertion operator (in colour space) times the Born cross section. We give selected results for the insertion operator for processes with two and three hard partons in the final state.
|
1605.03088
|
Peter A. Sturrock
|
Peter Sturrock, Gideon Steinitz, Ephraim Fischbach, Alexander
Parkhomov, Jeffrey Scargle
|
Analysis of beta-decay data acquired at the Physikalisch-Technische
Bundesanstalt: evidence of a solar influence
|
13 pages, 19 figures
| null |
10.1016/j.astropartphys.2016.07.005
| null |
hep-ph physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
According to an article entitled Disproof of solar influence on the decay
rates of 90Sr/90Y by Kossert and N\"ahle of the Physikalisch-Technische
Bundesanstalt (PTB) [1], the PTB measurements show no evidence of variability.
We show that, on the contrary, those measurements reveal strong evidence of
variability, including an oscillation at 11 year-1 that is suggestive of an
influence of internal solar rotation. An analysis of radon beta-decay data
acquired at the Geological Survey of Israel (GSI) Laboratory for the same time
interval yields strong confirmation of this oscillation.
|
[
{
"created": "Tue, 10 May 2016 16:34:25 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2016 18:43:26 GMT",
"version": "v2"
}
] |
2016-08-17
|
[
[
"Sturrock",
"Peter",
""
],
[
"Steinitz",
"Gideon",
""
],
[
"Fischbach",
"Ephraim",
""
],
[
"Parkhomov",
"Alexander",
""
],
[
"Scargle",
"Jeffrey",
""
]
] |
According to an article entitled Disproof of solar influence on the decay rates of 90Sr/90Y by Kossert and N\"ahle of the Physikalisch-Technische Bundesanstalt (PTB) [1], the PTB measurements show no evidence of variability. We show that, on the contrary, those measurements reveal strong evidence of variability, including an oscillation at 11 year-1 that is suggestive of an influence of internal solar rotation. An analysis of radon beta-decay data acquired at the Geological Survey of Israel (GSI) Laboratory for the same time interval yields strong confirmation of this oscillation.
|
1102.4917
|
Bhag C. Chauhan
|
Lal Singh, Bhag C. Chauhan, Ravi Dutt, K. K. Sharma and S. Dev
|
Model Independent Constraints on Solar Neutrinos
|
21 pages, 3 figures and 13 tables
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the data from SNO NCD phase, SuperK, Borexino and KamLAND Solar phase,
we derive in a model independent way, bounds on the possible components in the
solar neutrino flux. We update the limits on the antineutrino ($\bar\nu_x$)
flux and sterile ($\nu_s$) component and compare them with the previous results
obtained using SNO Salt phase data and data from SuperKamiokande experiments.
It is affirmed that the upper bound on $\bar\nu_x$ is independent of the
$\nu_s$ component. We recover the $\nu_s$ and $\bar\nu_x$ upper bounds existing
in the literature. We also obtain bounds on $f_B$, the SSM normalization factor
and the common parameter range for $f_B$ and the $\nu_s$ components in the
light of latest data. In summary, we update, in a model independent way, the
previous results existing in literature in the light of latest solar neutrino
data.
|
[
{
"created": "Thu, 24 Feb 2011 07:24:20 GMT",
"version": "v1"
}
] |
2011-02-25
|
[
[
"Singh",
"Lal",
""
],
[
"Chauhan",
"Bhag C.",
""
],
[
"Dutt",
"Ravi",
""
],
[
"Sharma",
"K. K.",
""
],
[
"Dev",
"S.",
""
]
] |
Using the data from SNO NCD phase, SuperK, Borexino and KamLAND Solar phase, we derive in a model independent way, bounds on the possible components in the solar neutrino flux. We update the limits on the antineutrino ($\bar\nu_x$) flux and sterile ($\nu_s$) component and compare them with the previous results obtained using SNO Salt phase data and data from SuperKamiokande experiments. It is affirmed that the upper bound on $\bar\nu_x$ is independent of the $\nu_s$ component. We recover the $\nu_s$ and $\bar\nu_x$ upper bounds existing in the literature. We also obtain bounds on $f_B$, the SSM normalization factor and the common parameter range for $f_B$ and the $\nu_s$ components in the light of latest data. In summary, we update, in a model independent way, the previous results existing in literature in the light of latest solar neutrino data.
|
2104.03979
|
Daniel Wiegand
|
Radja Boughezal, Frank Petriello, Daniel Wiegand
|
Disentangling SMEFT operators with future low-energy PVES experiments
|
22 pages, 7 Figures
|
Phys. Rev. D 104, 016005 (2021)
|
10.1103/PhysRevD.104.016005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the potential of future Parity-Violating Electron Scattering (PVES)
data to probe the parameter space of the Standard Model Effective Field Theory
(SMEFT). We contrast the constraints derived from Drell-Yan data taken at the
Large Hadron Collider (LHC) with projections of the planned PVES experiments
SoLID and P2. We show that the PVES data can complement the bounds set by the
LHC data in the dimension-6 operator space since it probes different
combinations of operators than Drell-Yan. The lower characteristic energy of P2
and SoLID also helps disentangle effects of dimension-6 and dimension-8
operators that are difficult to resolve with LHC Drell-Yan data alone.
|
[
{
"created": "Thu, 8 Apr 2021 18:00:03 GMT",
"version": "v1"
}
] |
2021-07-14
|
[
[
"Boughezal",
"Radja",
""
],
[
"Petriello",
"Frank",
""
],
[
"Wiegand",
"Daniel",
""
]
] |
We study the potential of future Parity-Violating Electron Scattering (PVES) data to probe the parameter space of the Standard Model Effective Field Theory (SMEFT). We contrast the constraints derived from Drell-Yan data taken at the Large Hadron Collider (LHC) with projections of the planned PVES experiments SoLID and P2. We show that the PVES data can complement the bounds set by the LHC data in the dimension-6 operator space since it probes different combinations of operators than Drell-Yan. The lower characteristic energy of P2 and SoLID also helps disentangle effects of dimension-6 and dimension-8 operators that are difficult to resolve with LHC Drell-Yan data alone.
|
hep-ph/9210253
| null |
K. Rajagopal and F. Wilczek
|
Static and Dynamic Critical Phenomena at a Second Order QCD Phase
Transition
|
phyzzx, 41 pages, 4 figures available as a postscript file from K.R.,
PUPT-1347, IASSNS-HEP-92/60
|
Nucl.Phys. B399 (1993) 395-425
|
10.1016/0550-3213(93)90502-G
| null |
hep-ph astro-ph hep-lat
| null |
In QCD with two flavors of massless quarks, the chiral phase transition is
plausibly in the same universality class as the classical four component
Heisenberg antiferromagnet. Therefore, renormalization group techniques
developed in the study of phase transitions can be applied to calculate the
critical exponents which characterize the scaling behaviour of universal
quantities near the critical point. This approach to the QCD phase transition
has implications both for lattice gauge theory and for heavy ion collisions.
Future lattice simulations with longer correlation lengths will be able to
measure the various exponents and the equation of state for the order parameter
as a function of temperature and quark mass which we describe. In a heavy ion
collision, the consequence of a long correlation length would be large
fluctuations in the number ratio of neutral to charged pions. Unfortunately, we
show that this phenomenon will not occur if the plasma stays close to
equilibrium as it cools. If the transition is far out of equilibrium and can be
modelled as a quench, it is possible that large volumes of the plasma with the
pion field correlated will develop, with dramatic phenomenological
consequences. }
|
[
{
"created": "Tue, 20 Oct 1992 23:13:41 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Rajagopal",
"K.",
""
],
[
"Wilczek",
"F.",
""
]
] |
In QCD with two flavors of massless quarks, the chiral phase transition is plausibly in the same universality class as the classical four component Heisenberg antiferromagnet. Therefore, renormalization group techniques developed in the study of phase transitions can be applied to calculate the critical exponents which characterize the scaling behaviour of universal quantities near the critical point. This approach to the QCD phase transition has implications both for lattice gauge theory and for heavy ion collisions. Future lattice simulations with longer correlation lengths will be able to measure the various exponents and the equation of state for the order parameter as a function of temperature and quark mass which we describe. In a heavy ion collision, the consequence of a long correlation length would be large fluctuations in the number ratio of neutral to charged pions. Unfortunately, we show that this phenomenon will not occur if the plasma stays close to equilibrium as it cools. If the transition is far out of equilibrium and can be modelled as a quench, it is possible that large volumes of the plasma with the pion field correlated will develop, with dramatic phenomenological consequences. }
|
hep-ph/0212407
|
Harry Lipkin
|
Harry J. Lipkin (Weizmann Institute, Tel Aviv University, Argonne)
|
Experimental Challenges for QCD - The past and the future
|
19 pages, typo in e-mail address corrected
| null |
10.1142/9789812776310_0010
| null |
hep-ph
| null |
The past leaves the surprising experimental successes of the simple
constituent quark model to be expained by QCD. Surprising agreement with
experiment from simple Sakharov-Zeldovich model (1966) having quarks with
effective masses and hyperfine interaction. Nambu's (1966) Colored quarks with
gauge gluons gave mass spectrum with only $qqq$ and $\bar q$ bound states. The
future opens the way to new insight into QCD from heavy flavor experiments
|
[
{
"created": "Tue, 31 Dec 2002 08:58:15 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jan 2003 09:49:18 GMT",
"version": "v2"
}
] |
2017-08-23
|
[
[
"Lipkin",
"Harry J.",
"",
"Weizmann Institute, Tel Aviv University, Argonne"
]
] |
The past leaves the surprising experimental successes of the simple constituent quark model to be expained by QCD. Surprising agreement with experiment from simple Sakharov-Zeldovich model (1966) having quarks with effective masses and hyperfine interaction. Nambu's (1966) Colored quarks with gauge gluons gave mass spectrum with only $qqq$ and $\bar q$ bound states. The future opens the way to new insight into QCD from heavy flavor experiments
|
2004.04780
|
Anatoly Butkevich
|
A. V. Butkevich and S. V. Luchuk
|
Inclusive electron scattering off $^{12}$C, ${}^{40}$Ca, and
${}^{40}$Ar: effects of the meson exchange currents
| null |
Phys. Rev. C 102, 024602 (2020)
|
10.1103/PhysRevC.102.024602
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scattering of electrons on carbon, calcium, and argon targets are
analyzed using an approach that incorporates the contributions to the
electromagnetic response functions from the quasielastic (QE), inelastic
processes, and two-particle and two-hole meson exchange current ($2p-2h$ MEC).
This approach describes well the whole energy spectrum of data at very
different kinematics. It is shown that the accuracy of the $(e,e')$ cross
section calculations in the region between the QE and delta-resonance peaks,
where the $2p-2h$ MEC contribution reaches its maximum value, depends on the
momentum transfer $|\q|$ and at $|\q|>500$ MeV the calculated and measured
cross sections are in agreement within the experimental uncertainties.
|
[
{
"created": "Thu, 9 Apr 2020 19:35:05 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Sep 2020 08:08:11 GMT",
"version": "v2"
}
] |
2020-09-22
|
[
[
"Butkevich",
"A. V.",
""
],
[
"Luchuk",
"S. V.",
""
]
] |
The scattering of electrons on carbon, calcium, and argon targets are analyzed using an approach that incorporates the contributions to the electromagnetic response functions from the quasielastic (QE), inelastic processes, and two-particle and two-hole meson exchange current ($2p-2h$ MEC). This approach describes well the whole energy spectrum of data at very different kinematics. It is shown that the accuracy of the $(e,e')$ cross section calculations in the region between the QE and delta-resonance peaks, where the $2p-2h$ MEC contribution reaches its maximum value, depends on the momentum transfer $|\q|$ and at $|\q|>500$ MeV the calculated and measured cross sections are in agreement within the experimental uncertainties.
|
hep-ph/9901360
|
Silvano Simula
|
G. Ricco, S. Simula and M. Battaglieri
|
Power corrections in the longitudinal and transverse structure functions
of proton and deuteron
|
revised version with only minor changes, to appear in Nuclear Physics
B
|
Nucl.Phys. B555 (1999) 306-334
|
10.1016/S0550-3213(99)00302-8
|
preprint INFN-RM3 98/2
|
hep-ph
| null |
Power corrections to the Q**2 behaviour of the low-order moments of both the
longitudinal and transverse structure functions of proton and deuteron have
been investigated using available phenomenological fits of existing data in the
Q**2 range between 1 and 20 (GeV/c)**2. The Natchmann definition of the moments
has been adopted for disentangling properly target-mass and dynamical
higher-twist effects in the data. The leading twist has been treated at
next-to-leading order in the strong coupling constant and the effects of higher
orders of the perturbative series have been estimated using a
renormalon-inspired model. The contributions of (target-dependent) multiparton
correlations to both 1/Q**2 and 1/Q**4 power terms have been determined in the
transverse channel, while the longitudinal one appears to be consistent with a
pure infrared renormalon picture in the whole Q**2-range between 1 and 20
(GeV/c)**2. Finally, the extracted twist-2 contribution in the deuteron turns
out to be compatible with the hypothesis of an enhanced d-quark parton
distribution at large x.
|
[
{
"created": "Wed, 20 Jan 1999 17:56:06 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 1999 10:36:33 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Ricco",
"G.",
""
],
[
"Simula",
"S.",
""
],
[
"Battaglieri",
"M.",
""
]
] |
Power corrections to the Q**2 behaviour of the low-order moments of both the longitudinal and transverse structure functions of proton and deuteron have been investigated using available phenomenological fits of existing data in the Q**2 range between 1 and 20 (GeV/c)**2. The Natchmann definition of the moments has been adopted for disentangling properly target-mass and dynamical higher-twist effects in the data. The leading twist has been treated at next-to-leading order in the strong coupling constant and the effects of higher orders of the perturbative series have been estimated using a renormalon-inspired model. The contributions of (target-dependent) multiparton correlations to both 1/Q**2 and 1/Q**4 power terms have been determined in the transverse channel, while the longitudinal one appears to be consistent with a pure infrared renormalon picture in the whole Q**2-range between 1 and 20 (GeV/c)**2. Finally, the extracted twist-2 contribution in the deuteron turns out to be compatible with the hypothesis of an enhanced d-quark parton distribution at large x.
|
hep-ph/0006290
|
A. Bialas
|
A.Bialas, M.Kucharczyk, H.Palka and K.Zalewski
|
Mass dependence of HBT correlations in e^+e^- annihilation
|
15 pages, 3 figures
|
Phys.Rev.D62:114007,2000
|
10.1103/PhysRevD.62.114007
|
TPJU-6/2000
|
hep-ph
| null |
Mass dependence of the effective source radii, observed in hadronic $Z^0$
decays by several LEP I experiments, is analyzed in a model which assumes
proportionality between four-momentum of a produced particle and the
four-vector describing its space-time position at the freeze-out. It is shown
that this relation (commonly accepted in description of high-energy collisions)
can explain the data, provided all particles are emitted from a "tube" of $\sim
1$ fm in diameter at a constant proper time $\sim 1.5$ fm.
|
[
{
"created": "Mon, 26 Jun 2000 11:07:39 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Bialas",
"A.",
""
],
[
"Kucharczyk",
"M.",
""
],
[
"Palka",
"H.",
""
],
[
"Zalewski",
"K.",
""
]
] |
Mass dependence of the effective source radii, observed in hadronic $Z^0$ decays by several LEP I experiments, is analyzed in a model which assumes proportionality between four-momentum of a produced particle and the four-vector describing its space-time position at the freeze-out. It is shown that this relation (commonly accepted in description of high-energy collisions) can explain the data, provided all particles are emitted from a "tube" of $\sim 1$ fm in diameter at a constant proper time $\sim 1.5$ fm.
|
2207.10090
|
Joshua Foster
|
Christopher Dessert, Joshua W. Foster, Yujin Park, Benjamin R. Safdi,
Weishuang Linda Xu
|
Higgsino Dark Matter Confronts 14 years of Fermi Gamma Ray Data
|
7+20 pages, 3+23 figures
| null |
10.1103/PhysRevLett.130.201001
|
MIT-CTP/5454
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Thermal higgsino dark matter (DM), with mass around 1 TeV, is a
well-motivated, minimal DM scenario that arises in supersymmetric extensions of
the Standard Model. Higgsinos may naturally be the lightest superpartners in
Split-supersymmetry models that decouple the scalar superpartners while keeping
higgsinos and gauginos close to the TeV scale. Higgsino DM may annihilate today
to give continuum gamma-ray emission at energies less than a TeV in addition to
a line-like signature at energies equal to the mass. Previous searches for
higgsino DM, for example with the H.E.S.S. gamma-ray telescope, have not
reached the necessary sensitivity to probe the higgsino annihilation
cross-section. In this work we make use of 14 years of $\textit{Fermi}$
gamma-ray data at energies above $\sim$10 GeV to search for the continuum
emission near the Galactic Center from higgsino annihilation. We interpret our
results using DM profiles from Milky Way analogue galaxies in the FIRE-2
hydrodynamic cosmological simulations. We set the strongest constraints to-date
on higgsino-like DM. Our results show a mild, $\sim$2$\sigma$ preference for
higgsino DM with a mass near the thermal higgsino mass and, depending on the DM
density profile, the expected cross-section.
|
[
{
"created": "Wed, 20 Jul 2022 18:00:00 GMT",
"version": "v1"
}
] |
2023-05-31
|
[
[
"Dessert",
"Christopher",
""
],
[
"Foster",
"Joshua W.",
""
],
[
"Park",
"Yujin",
""
],
[
"Safdi",
"Benjamin R.",
""
],
[
"Xu",
"Weishuang Linda",
""
]
] |
Thermal higgsino dark matter (DM), with mass around 1 TeV, is a well-motivated, minimal DM scenario that arises in supersymmetric extensions of the Standard Model. Higgsinos may naturally be the lightest superpartners in Split-supersymmetry models that decouple the scalar superpartners while keeping higgsinos and gauginos close to the TeV scale. Higgsino DM may annihilate today to give continuum gamma-ray emission at energies less than a TeV in addition to a line-like signature at energies equal to the mass. Previous searches for higgsino DM, for example with the H.E.S.S. gamma-ray telescope, have not reached the necessary sensitivity to probe the higgsino annihilation cross-section. In this work we make use of 14 years of $\textit{Fermi}$ gamma-ray data at energies above $\sim$10 GeV to search for the continuum emission near the Galactic Center from higgsino annihilation. We interpret our results using DM profiles from Milky Way analogue galaxies in the FIRE-2 hydrodynamic cosmological simulations. We set the strongest constraints to-date on higgsino-like DM. Our results show a mild, $\sim$2$\sigma$ preference for higgsino DM with a mass near the thermal higgsino mass and, depending on the DM density profile, the expected cross-section.
|
1901.08281
|
Li Lin Yang
|
Michal Czakon, Andrea Ferroglia, Alexander Mitov, Davide Pagani,
Andrew S. Papanastasiou, Benjamin D. Pecjak, Darren J. Scott, Ioannis
Tsinikos, Xing Wang, Li Lin Yang, Marco Zaro
|
Top-quark pair production at complete-NLO accuracy with NNLO+NNLL$'$
corrections in QCD
|
Contribution to the proceedings of the 11th International Workshop on
Top Quark Physics (TOP2018); v3: significantly modified version with more
numeric results
|
Chin.Phys.C 44 (2020) 8, 083104
|
10.1088/1674-1137/44/8/083104
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe predictions for top-quark pair differential distributions at
hadron colliders, which combine state-of-the-art NNLO QCD calculations and NLO
electroweak corrections together with double resummation at NNLL$'$ accuracy of
threshold logarithms and small-mass logarithms. This is the first time that
such a combination has appeared in the literature. Numerical results are
presented for the invariant-mass distribution, the transverse-momentum
distribution as well as rapidity distributions.
|
[
{
"created": "Thu, 24 Jan 2019 08:33:35 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2019 08:20:25 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Feb 2020 06:22:28 GMT",
"version": "v3"
}
] |
2020-08-06
|
[
[
"Czakon",
"Michal",
""
],
[
"Ferroglia",
"Andrea",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Pagani",
"Davide",
""
],
[
"Papanastasiou",
"Andrew S.",
""
],
[
"Pecjak",
"Benjamin D.",
""
],
[
"Scott",
"Darren J.",
""
],
[
"Tsinikos",
"Ioannis",
""
],
[
"Wang",
"Xing",
""
],
[
"Yang",
"Li Lin",
""
],
[
"Zaro",
"Marco",
""
]
] |
We describe predictions for top-quark pair differential distributions at hadron colliders, which combine state-of-the-art NNLO QCD calculations and NLO electroweak corrections together with double resummation at NNLL$'$ accuracy of threshold logarithms and small-mass logarithms. This is the first time that such a combination has appeared in the literature. Numerical results are presented for the invariant-mass distribution, the transverse-momentum distribution as well as rapidity distributions.
|
hep-ph/0406005
|
Ramazan Sever
|
Sameer M. Ikhdair and Ramazan Sever
|
Mass Spectra of Heavy Quarkonia and B_{c} Decay Constant for Static
Scalar-Vector Interactions with Relativistic Kinematics
|
35 pages
|
Int.J.Mod.Phys.A20:6509-6531,2005
|
10.1142/S0217751X05021294
| null |
hep-ph
| null |
We reproduce masses of the self-conjugate and non-self-conjugate mesons in
the context of the spinless Salpeter equation taking into account the
relativistic kinematics and the quark spins. The hyperfine splittings for the
${\rm 2S}$ charmonium and ${\rm 1S}$ bottomonium are also calculated. Further,
the pseudoscalar and vector decay constants of the $B_{c}$ meson and the
unperturbed radial wave function at the origin are also calculated. We have
obtained a local equation with a complete relativistic corrections to a class
of three attractive static interaction potentials of the general form
$V(r)=-Ar^{-\beta}+\kappa r^{\beta}+V_{0},$ with $\beta =1,1/2,~3/4$ decomposed
into scalar and vector parts in the form $V_{V}(r)=-Ar^{-\beta
}+(1-\epsilon)\kappa r^{\beta}$ and $V_{S}(r)=\epsilon \kappa r^{\beta
}+V_{0};$ where $0\leq \epsilon \leq 1.$ We have used the shifted
large-N-expansion technique (SLNET) to solve the reduced equation for the
scalar $(\epsilon =1),$ equal mixture of scalar-vector $(\epsilon =1/2),$ and
vector $(\epsilon =0)$ confinement interaction kernels. The energy eigenvalues
are carried out up to the third order approximation.
|
[
{
"created": "Mon, 31 May 2004 23:47:29 GMT",
"version": "v1"
}
] |
2010-11-05
|
[
[
"Ikhdair",
"Sameer M.",
""
],
[
"Sever",
"Ramazan",
""
]
] |
We reproduce masses of the self-conjugate and non-self-conjugate mesons in the context of the spinless Salpeter equation taking into account the relativistic kinematics and the quark spins. The hyperfine splittings for the ${\rm 2S}$ charmonium and ${\rm 1S}$ bottomonium are also calculated. Further, the pseudoscalar and vector decay constants of the $B_{c}$ meson and the unperturbed radial wave function at the origin are also calculated. We have obtained a local equation with a complete relativistic corrections to a class of three attractive static interaction potentials of the general form $V(r)=-Ar^{-\beta}+\kappa r^{\beta}+V_{0},$ with $\beta =1,1/2,~3/4$ decomposed into scalar and vector parts in the form $V_{V}(r)=-Ar^{-\beta }+(1-\epsilon)\kappa r^{\beta}$ and $V_{S}(r)=\epsilon \kappa r^{\beta }+V_{0};$ where $0\leq \epsilon \leq 1.$ We have used the shifted large-N-expansion technique (SLNET) to solve the reduced equation for the scalar $(\epsilon =1),$ equal mixture of scalar-vector $(\epsilon =1/2),$ and vector $(\epsilon =0)$ confinement interaction kernels. The energy eigenvalues are carried out up to the third order approximation.
|
2312.01908
|
Wen-Xuan Zhang
|
Zhen-Hui Zhu, Wen-Xuan Zhang and Duojie Jia
|
Triply heavy tetraquark states: masses and other properties
|
19 pages, 6 figures, 5 tables and two appendices, created by RevTex 4
|
Eur. Phys. J. C (2024) 84:344
|
10.1140/epjc/s10052-024-12700-1
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
In this work, we study masses and other static properties of triply heavy
tetraquarks in the unified framework of the MIT bag which incorporates
chromomagnetic interactions and enhanced binding energy. The masses, magnetic
moments and charge radii of all strange and nonstrange (ground) states of
triply heavy tetraquarks are computed, suggesting that all of triply heavy
tetraquarks are above the respective two-meson thresholds. We also estimate
relative decay widths of main decay channels of two-heavy mesons for these
tetraquarks.
|
[
{
"created": "Mon, 4 Dec 2023 14:13:09 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2024 02:11:15 GMT",
"version": "v2"
}
] |
2024-06-14
|
[
[
"Zhu",
"Zhen-Hui",
""
],
[
"Zhang",
"Wen-Xuan",
""
],
[
"Jia",
"Duojie",
""
]
] |
In this work, we study masses and other static properties of triply heavy tetraquarks in the unified framework of the MIT bag which incorporates chromomagnetic interactions and enhanced binding energy. The masses, magnetic moments and charge radii of all strange and nonstrange (ground) states of triply heavy tetraquarks are computed, suggesting that all of triply heavy tetraquarks are above the respective two-meson thresholds. We also estimate relative decay widths of main decay channels of two-heavy mesons for these tetraquarks.
|
0909.3199
|
Vojtech Kundrat
|
Milos V. Lokajicek, V. Kundrat
|
Elastic pp scattering and the internal structure of colliding proton
|
7 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Elastic scattering data gained for proton-proton collisions at high energies
are being analyzed at the present practically only with the help of purely
phenomenological mathematical models. And the question exists whether in the
impact parameter plane the elastic processes may be interpreted as central or
peripheral. From realistic point of view the peripherality should be preferred
and one may expect that nucleon dimensions should manifest in some way in
elastic data. It will be demonstrated that the elastic pp data at the energy of
53 GeV in the interval |t| from (0., 4.) [GeV^2] may be interpreted well as the
superposition of mutual collisions of two internal structures with maximal
external dimensions; the approximate dimensions and frequencies of
corresponding structures being established on the basis of measured elastic
data.
|
[
{
"created": "Thu, 17 Sep 2009 12:22:24 GMT",
"version": "v1"
}
] |
2009-09-18
|
[
[
"Lokajicek",
"Milos V.",
""
],
[
"Kundrat",
"V.",
""
]
] |
Elastic scattering data gained for proton-proton collisions at high energies are being analyzed at the present practically only with the help of purely phenomenological mathematical models. And the question exists whether in the impact parameter plane the elastic processes may be interpreted as central or peripheral. From realistic point of view the peripherality should be preferred and one may expect that nucleon dimensions should manifest in some way in elastic data. It will be demonstrated that the elastic pp data at the energy of 53 GeV in the interval |t| from (0., 4.) [GeV^2] may be interpreted well as the superposition of mutual collisions of two internal structures with maximal external dimensions; the approximate dimensions and frequencies of corresponding structures being established on the basis of measured elastic data.
|
hep-ph/9912444
|
Arnd Leike
|
Stephen Godfrey, Pat Kalyniak, Basim Kamal and Arnd Leike
|
Constraints on Couplings of Extra Gauge Bosons from e+e- --> nu nubar
gamma
|
8 pages Latex, 8 figures included with epsf, contribution to the
Linear Collider workshop
| null | null | null |
hep-ph
| null |
If extra gauge bosons are observed at the LHC or at a linear e+e- collider,
the reaction e+e- --> nu nubar gamma can give information on the couplings (W'
nu l) and (Z' nu nubar). The total cross section and polarization asymmetries
are the most sensitive observables for such a measurement. Small systematic
errors are crucial to obtain reasonable coupling constraints, especially for a
high luminosity collider.
|
[
{
"created": "Tue, 21 Dec 1999 14:25:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Godfrey",
"Stephen",
""
],
[
"Kalyniak",
"Pat",
""
],
[
"Kamal",
"Basim",
""
],
[
"Leike",
"Arnd",
""
]
] |
If extra gauge bosons are observed at the LHC or at a linear e+e- collider, the reaction e+e- --> nu nubar gamma can give information on the couplings (W' nu l) and (Z' nu nubar). The total cross section and polarization asymmetries are the most sensitive observables for such a measurement. Small systematic errors are crucial to obtain reasonable coupling constraints, especially for a high luminosity collider.
|
hep-ph/0302213
|
A. A. Arkhipov
|
A.A. Arkhipov
|
Kaluza-Klein Picture and Mass Spectrum of Two-Pion System
|
LaTex2e, 11 pages; 4 references added, 2 empty cells filled
| null | null | null |
hep-ph hep-ex nucl-ex
| null |
In this note we present additional arguments in favour of Kaluza and Klein
picture of the world. In fact, we have shown that formula (\ref{KKpi}) provided
by Kaluza-Klein approach with the fundamental scale early calculated
(Eq.\ref{scale} \cite{1}) gives an excellent description for the mass spectrum
of two-pion system.
|
[
{
"created": "Mon, 24 Feb 2003 18:12:40 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Feb 2003 16:19:40 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Apr 2003 18:13:26 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Arkhipov",
"A. A.",
""
]
] |
In this note we present additional arguments in favour of Kaluza and Klein picture of the world. In fact, we have shown that formula (\ref{KKpi}) provided by Kaluza-Klein approach with the fundamental scale early calculated (Eq.\ref{scale} \cite{1}) gives an excellent description for the mass spectrum of two-pion system.
|
2302.04892
|
Victor Martin Lozano
|
Danyer Perez Adan, Henning Bahl, Alexander Grohsjean, Victor Martin
Lozano, Christian Schwanenberger, Georg Weiglein
|
A new LHC search for dark matter produced via heavy Higgs bosons using
simplified models
|
27 pages, 8 figures, 4 tables
|
JHEP 08 (2023) 151
|
10.1007/JHEP08(2023)151
|
DESY 23-014, EFI-22-10
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Searches for dark matter produced via scalar resonances in final states
consisting of Standard Model (SM) particles and missing transverse momentum are
of high relevance at the LHC. Motivated by dark-matter portal models, most
existing searches are optimized for unbalanced decay topologies for which the
missing momentum recoils against the visible SM particles. In this work, we
show that existing searches are also sensitive to a wider class of models,
which we characterize by a recently presented simplified model framework. We
point out that searches for models with a balanced decay topology can be
further improved with more dedicated analysis strategies. For this study, we
investigate the feasibility of a new search for bottom-quark associated neutral
Higgs production with a $b \bar b Z + p_\text{T}^\text{miss}$ final state and
perform a detailed collider analysis. Our projected results in the different
simplified model topologies investigated here can be easily reinterpreted in a
wide range of models of physics beyond the SM, which we explicitly demonstrate
for the example of the Two-Higgs-Doublet model with an additional pseudoscalar
Higgs boson.
|
[
{
"created": "Thu, 9 Feb 2023 19:00:10 GMT",
"version": "v1"
}
] |
2023-09-19
|
[
[
"Adan",
"Danyer Perez",
""
],
[
"Bahl",
"Henning",
""
],
[
"Grohsjean",
"Alexander",
""
],
[
"Lozano",
"Victor Martin",
""
],
[
"Schwanenberger",
"Christian",
""
],
[
"Weiglein",
"Georg",
""
]
] |
Searches for dark matter produced via scalar resonances in final states consisting of Standard Model (SM) particles and missing transverse momentum are of high relevance at the LHC. Motivated by dark-matter portal models, most existing searches are optimized for unbalanced decay topologies for which the missing momentum recoils against the visible SM particles. In this work, we show that existing searches are also sensitive to a wider class of models, which we characterize by a recently presented simplified model framework. We point out that searches for models with a balanced decay topology can be further improved with more dedicated analysis strategies. For this study, we investigate the feasibility of a new search for bottom-quark associated neutral Higgs production with a $b \bar b Z + p_\text{T}^\text{miss}$ final state and perform a detailed collider analysis. Our projected results in the different simplified model topologies investigated here can be easily reinterpreted in a wide range of models of physics beyond the SM, which we explicitly demonstrate for the example of the Two-Higgs-Doublet model with an additional pseudoscalar Higgs boson.
|
1306.6808
|
Rafal Maciula
|
Rafal Maciula and Antoni Szczurek
|
Charmed mesons and leptons from semileptonic decays at the LHC
|
5 pages, 4 figures, talk given by R. Maciula at the XXI.
International Workshop on Deep-Inelastic Scattering and Related Subjects DIS
2013, 22-26 April 2013, Marseille, France
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss production of charmed mesons as well as electrons/muons from
semileptonic decays of charm and bottom mesons in proton-proton collisions at
the LHC. The cross section for inclusive production of $c \bar c$ and $b \bar
b$ pairs is calculated in the framework of the $k_{\perp}$-factorization
approach. Here, the KMR and Jung CCFM unintegrated gluon distribution functions
are used. Theoretical uncertainties of the model related to the choice of
renormalization and factorization scales as well as due to the quark mass are
also discussed. The hadronization of charm and bottom quarks is included within
the fragmentation functions technique. Inclusive differential distributions in
transverse momentum of charmed mesons are presented and compared to recent
results of the ALICE collaboration. Furthermore, we also consider production of
different $D \bar D$ pairs in unique kinematics of forward rapidities of the
LHCb experiment. Kinematical correlations in azimuthal angle $\varphi_{D\bar
D}$ and invariant mass $M_{D \bar D}$ distributions are presented and compared
to LHCb data. Furthermore, the semileptonic decays of charm and bottom mesons
are done with the help of decay functions found by fitting recent semileptonic
data obtained by the CLEO and BABAR collaborations. Inclusive differential
distributions in transverse momentum of leptons for several kinematical regions
are presented and compared to recent results of the ALICE and CMS
collaborations.
|
[
{
"created": "Fri, 28 Jun 2013 12:18:05 GMT",
"version": "v1"
}
] |
2013-07-01
|
[
[
"Maciula",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We discuss production of charmed mesons as well as electrons/muons from semileptonic decays of charm and bottom mesons in proton-proton collisions at the LHC. The cross section for inclusive production of $c \bar c$ and $b \bar b$ pairs is calculated in the framework of the $k_{\perp}$-factorization approach. Here, the KMR and Jung CCFM unintegrated gluon distribution functions are used. Theoretical uncertainties of the model related to the choice of renormalization and factorization scales as well as due to the quark mass are also discussed. The hadronization of charm and bottom quarks is included within the fragmentation functions technique. Inclusive differential distributions in transverse momentum of charmed mesons are presented and compared to recent results of the ALICE collaboration. Furthermore, we also consider production of different $D \bar D$ pairs in unique kinematics of forward rapidities of the LHCb experiment. Kinematical correlations in azimuthal angle $\varphi_{D\bar D}$ and invariant mass $M_{D \bar D}$ distributions are presented and compared to LHCb data. Furthermore, the semileptonic decays of charm and bottom mesons are done with the help of decay functions found by fitting recent semileptonic data obtained by the CLEO and BABAR collaborations. Inclusive differential distributions in transverse momentum of leptons for several kinematical regions are presented and compared to recent results of the ALICE and CMS collaborations.
|
hep-ph/0209301
|
Wilfried Buchmuller
|
W. Buchm\"uller, P. Di Bari, M. Pl\"umacher
|
A bound on neutrino masses from baryogenesis
|
8 pages, 2 figures
|
Phys.Lett. B547 (2002) 128-132
|
10.1016/S0370-2693(02)02758-2
|
DESY 02-107, OUTP-02-36-P
|
hep-ph astro-ph hep-ex hep-th
| null |
Properties of neutrinos, the lightest of all elementary particles, may be the
origin of the entire matter-antimatter asymmetry of the universe. This requires
that neutrinos are Majorana particles, which are equal to their antiparticles,
and that their masses are sufficiently small. Leptogenesis, the theory
explaining the cosmic matter-antimatter asymmetry, predicts that all neutrino
masses are smaller than 0.2 eV, which will be tested by forthcoming laboratory
experiments and by cosmology.
|
[
{
"created": "Wed, 25 Sep 2002 15:54:59 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Buchmüller",
"W.",
""
],
[
"Di Bari",
"P.",
""
],
[
"Plümacher",
"M.",
""
]
] |
Properties of neutrinos, the lightest of all elementary particles, may be the origin of the entire matter-antimatter asymmetry of the universe. This requires that neutrinos are Majorana particles, which are equal to their antiparticles, and that their masses are sufficiently small. Leptogenesis, the theory explaining the cosmic matter-antimatter asymmetry, predicts that all neutrino masses are smaller than 0.2 eV, which will be tested by forthcoming laboratory experiments and by cosmology.
|
2104.12190
|
Mohammad Athar SAJJAD
|
M. Sajjad Athar, and S. K. Singh
|
The low energy inclusive $\nu_{\mu} (\nu_{e})-^{12}$C scattering
revisited
|
12 pages, 3 figures, 3 tables
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We have reviewed the current status of the inclusive neutrino scattering from
$^{12}$C in the low energy region corresponding to the neutrino beams from the
pion, muon and kaon decaying at rest. The theoretical calculations of total
cross sections in various nuclear models with special emphasis on the recent
experiments with the monoenergetic neutrinos from KDAR [1] along with the older
experiments from KARMEN and LSND collaborations have been discussed in the
context of the recent works by Akbar et al. [2] and Nikolakopoulos et al. [3].
The inadequacy of the various theoretical models used to explain the
experimental results on the inclusive neutrino scattering from nuclei at low
energies has been highlighted and the need for a better understanding of the
nuclear medium effects beyond the impulse approximation has been emphasized.
|
[
{
"created": "Sun, 25 Apr 2021 16:05:21 GMT",
"version": "v1"
}
] |
2021-04-27
|
[
[
"Athar",
"M. Sajjad",
""
],
[
"Singh",
"S. K.",
""
]
] |
We have reviewed the current status of the inclusive neutrino scattering from $^{12}$C in the low energy region corresponding to the neutrino beams from the pion, muon and kaon decaying at rest. The theoretical calculations of total cross sections in various nuclear models with special emphasis on the recent experiments with the monoenergetic neutrinos from KDAR [1] along with the older experiments from KARMEN and LSND collaborations have been discussed in the context of the recent works by Akbar et al. [2] and Nikolakopoulos et al. [3]. The inadequacy of the various theoretical models used to explain the experimental results on the inclusive neutrino scattering from nuclei at low energies has been highlighted and the need for a better understanding of the nuclear medium effects beyond the impulse approximation has been emphasized.
|
1101.3557
|
G\'abor Somogyi
|
Gabor Somogyi
|
Angular integrals in d dimensions
|
30 pages, discussion slightly extended by mentioning the existence of
contiguous relations for H-functions, new references added
| null |
10.1063/1.3615515
|
DESY 11-004, SFB/CPP-11-02, LPN11-03
|
hep-ph math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the evaluation of certain d dimensional angular integrals which
arise in perturbative field theory calculations. We find that the angular
integral with n denominators can be computed in terms of a certain special
function, the so-called H-function of several variables. We also present
several illustrative examples of the general result and briefly consider some
applications.
|
[
{
"created": "Tue, 18 Jan 2011 21:03:05 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2011 13:20:20 GMT",
"version": "v2"
}
] |
2015-05-27
|
[
[
"Somogyi",
"Gabor",
""
]
] |
We discuss the evaluation of certain d dimensional angular integrals which arise in perturbative field theory calculations. We find that the angular integral with n denominators can be computed in terms of a certain special function, the so-called H-function of several variables. We also present several illustrative examples of the general result and briefly consider some applications.
|
1111.0353
|
Shunzo Kumano
|
M. Hirai, H. Kawamura, S. Kumano, K. Saito
|
Selected topics on parton distribution functions
|
8 pages, LaTeX, to be published in AIP proceedings, 8th
Circum-Pan-Pacific Symposium on High Energy Spin Physics, June 20-24, 2011,
Cairns, Australia
| null |
10.1063/1.3667318
|
KEK-TH-1494; J-PARC-TH-0002
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report recent studies on structure functions of the nucleon and nuclei.
First, clustering effects are investigated in the structure function F_2 of
Be-9 for explaining an unusual nuclear correction found in a JLab experiment.
We propose that high densities created by formation of clustering structure
like 2*alpha+neutron in Be-9 is the origin of the unexpected JLab result by
using the antisymmetrized molecular dynamics (AMD). There is an approved
proposal at JLab to investigate the structure functions of light nuclei
including the cluster structure, so that much details will become clear in a
few years. Second, tensor-polarized quark and antiquark distributions are
obtained by analyzing HERMES measurements on the structure function b_1 for the
deuteron. The result suggests a finite tensor polarization for antiquark
distributions, which is an interesting topic for further theoretical and
experimental investigations. An experimental proposal exists at JLab for
measuring b_1 of the deuteron as a new tensor-structure study in 2010's.
Furthermore, the antiquark tensor polarization could be measured by polarized
deuteron Drell-Yan processes at hadron facilities such as J-PARC and GSI-FAIR.
Third, the recent CDF dijet anomaly is investigated within the standard model
by considering possible modifications of the strange-quark distribution. We
find that the shape of a dijet-mass spectrum changes depending on the
strange-quark distribution. It indicates that the CDF excess could be partially
explained as a PDF effect, particularly by the strangeness in the nucleon,
within the standard model if the excess at m_{jj}~140 GeV is not a sharp peak.
|
[
{
"created": "Wed, 2 Nov 2011 00:16:30 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Hirai",
"M.",
""
],
[
"Kawamura",
"H.",
""
],
[
"Kumano",
"S.",
""
],
[
"Saito",
"K.",
""
]
] |
We report recent studies on structure functions of the nucleon and nuclei. First, clustering effects are investigated in the structure function F_2 of Be-9 for explaining an unusual nuclear correction found in a JLab experiment. We propose that high densities created by formation of clustering structure like 2*alpha+neutron in Be-9 is the origin of the unexpected JLab result by using the antisymmetrized molecular dynamics (AMD). There is an approved proposal at JLab to investigate the structure functions of light nuclei including the cluster structure, so that much details will become clear in a few years. Second, tensor-polarized quark and antiquark distributions are obtained by analyzing HERMES measurements on the structure function b_1 for the deuteron. The result suggests a finite tensor polarization for antiquark distributions, which is an interesting topic for further theoretical and experimental investigations. An experimental proposal exists at JLab for measuring b_1 of the deuteron as a new tensor-structure study in 2010's. Furthermore, the antiquark tensor polarization could be measured by polarized deuteron Drell-Yan processes at hadron facilities such as J-PARC and GSI-FAIR. Third, the recent CDF dijet anomaly is investigated within the standard model by considering possible modifications of the strange-quark distribution. We find that the shape of a dijet-mass spectrum changes depending on the strange-quark distribution. It indicates that the CDF excess could be partially explained as a PDF effect, particularly by the strangeness in the nucleon, within the standard model if the excess at m_{jj}~140 GeV is not a sharp peak.
|
hep-ph/0211401
|
Jungdae Kim
|
C. S. Kim and J. D. Kim
|
A Flexible Parametrization of CKM matrix via
Singular-Value-Decomposition Method
|
20 pages, 2 figures
|
Eur.Phys.J.C28:55-61,2003
|
10.1140/epjc/s2003-01151-3
| null |
hep-ph
| null |
We investigate a flexible method in which we can test the unitarity of the
quark flavor mixing matrix step-by-step. Singular-Value-Decomposition (SVD)
techniques are used in analyzing the mixing matrix over a broader parameter
region than the unitarity region. Unitary constraints make us extract CP
violating properties without any specific parametrization when the magnitudes
of at least three mixing matrix elements in three generation quark mixing are
given. This method can also be applied to the analysis of lepton flavor mixing,
in which only a few moduli are presently measured.
|
[
{
"created": "Tue, 26 Nov 2002 10:34:50 GMT",
"version": "v1"
}
] |
2010-11-23
|
[
[
"Kim",
"C. S.",
""
],
[
"Kim",
"J. D.",
""
]
] |
We investigate a flexible method in which we can test the unitarity of the quark flavor mixing matrix step-by-step. Singular-Value-Decomposition (SVD) techniques are used in analyzing the mixing matrix over a broader parameter region than the unitarity region. Unitary constraints make us extract CP violating properties without any specific parametrization when the magnitudes of at least three mixing matrix elements in three generation quark mixing are given. This method can also be applied to the analysis of lepton flavor mixing, in which only a few moduli are presently measured.
|
hep-ph/9804355
|
Christopher Kolda
|
K.S. Babu, Christopher Kolda, John March-Russell and Frank Wilczek
|
CP Violation, Higgs Couplings, and Supersymmetry
|
13 pages LaTeX, 4 figures (some typos fixed, discussion clarified)
|
Phys. Rev. D 59, 016004 (1998)
|
10.1103/PhysRevD.59.016004
|
IASSNS-HEP-98/30
|
hep-ph
| null |
Supersymmetric extensions of the standard model generically contain
additional sources of CP violation. We discuss how at one loop a potentially
large CP violating coupling of the lightest Higgs, h^0, to leptons is induced
in the minimal supersymmetric standard model (MSSM). The CP violating couplings
of h^0 in extensions of the MSSM, such as the next-to-minimal supersymmetric
standard model (NMSSM) are also considered. We indicate how this CP violation
might be observed; in particular a polarization-dependent production asymmetry,
in the context of a muon collider, provides a means to access this coupling
cleanly. In the MSSM, existing limits on the electric dipole moment (EDM) of
the electron, coupled with standard universality assumptions, severly
constrains any such signal. Nevertheless, extensions of the MSSM, such as the
NMSSM, allow CP-violating signals as large as 100%.
|
[
{
"created": "Tue, 21 Apr 1998 21:21:06 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 1998 22:09:42 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Babu",
"K. S.",
""
],
[
"Kolda",
"Christopher",
""
],
[
"March-Russell",
"John",
""
],
[
"Wilczek",
"Frank",
""
]
] |
Supersymmetric extensions of the standard model generically contain additional sources of CP violation. We discuss how at one loop a potentially large CP violating coupling of the lightest Higgs, h^0, to leptons is induced in the minimal supersymmetric standard model (MSSM). The CP violating couplings of h^0 in extensions of the MSSM, such as the next-to-minimal supersymmetric standard model (NMSSM) are also considered. We indicate how this CP violation might be observed; in particular a polarization-dependent production asymmetry, in the context of a muon collider, provides a means to access this coupling cleanly. In the MSSM, existing limits on the electric dipole moment (EDM) of the electron, coupled with standard universality assumptions, severly constrains any such signal. Nevertheless, extensions of the MSSM, such as the NMSSM, allow CP-violating signals as large as 100%.
|
1704.00546
|
Antoni Szczurek
|
Izabela Babiarz, Rafal Staszewski and Antoni Szczurek
|
Multi-parton interactions and rapidity gap survival probability in
jet-gap-jet processes
|
18 pages, 10 figures
| null |
10.1016/j.physletb.2017.05.095
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss an application of dynamical multi-parton interaction model, tuned
to measurements of underlying event topology, for a description of destroying
rapidity gaps in the jet-gap-jet processes at the LHC. We concentrate on the
dynamical origin of the mechanism of destroying the rapidity gap. The cross
section for jet-gap-jet is calculated within LL BFKL approximation. We discuss
the topology of final states without and with the MPI effects. We discuss some
examples of selected kinematical situations (fixed jet rapidities and
transverse momenta) as distributions averaged over the dynamics of the
jet-gap-jet scattering. The color-singlet ladder exchange amplitude for the
partonic subprocess is implemented into the \textsc{Pythia 8} generator, which
is then used for hadronisation and for the simulation of the MPI effects.
Several differential distributions are shown and discussed. We present the
ratio of cross section calculated with and without MPI effects as a function of
rapidity gap in between the jets.
|
[
{
"created": "Mon, 3 Apr 2017 12:24:44 GMT",
"version": "v1"
}
] |
2017-06-14
|
[
[
"Babiarz",
"Izabela",
""
],
[
"Staszewski",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We discuss an application of dynamical multi-parton interaction model, tuned to measurements of underlying event topology, for a description of destroying rapidity gaps in the jet-gap-jet processes at the LHC. We concentrate on the dynamical origin of the mechanism of destroying the rapidity gap. The cross section for jet-gap-jet is calculated within LL BFKL approximation. We discuss the topology of final states without and with the MPI effects. We discuss some examples of selected kinematical situations (fixed jet rapidities and transverse momenta) as distributions averaged over the dynamics of the jet-gap-jet scattering. The color-singlet ladder exchange amplitude for the partonic subprocess is implemented into the \textsc{Pythia 8} generator, which is then used for hadronisation and for the simulation of the MPI effects. Several differential distributions are shown and discussed. We present the ratio of cross section calculated with and without MPI effects as a function of rapidity gap in between the jets.
|
hep-ph/0110134
|
Georgii N. Shestakov
|
N.N. Achasov and G.N. Shestakov (Institute for Mathematics,
Novosibirsk, Russia)
|
Effective Lagrangians Induced by the Anomalous Wess-Zumino Action and
$I^G(J^{PC})=1^-(1^{-+})$ Exotic States
|
Parallel session talk given at HADRON 2001, Protvino, Russia, August
28, 2001. LaTex, 5 pages, 1 figure
|
AIP Conf.Proc. 619 (2002) 599-602
|
10.1063/1.1482499
| null |
hep-ph hep-ex nucl-th
| null |
A simple dynamical model for the exotic waves with $I^G(J^{PC})=1^-(1^{-+})$
in the reactions $\rho\pi\to\rho\pi$, $\rho\pi\to\eta\pi$,
$\rho\pi\to\eta'\pi$, $ \rho\pi\to(K^*\bar K+\bar K^*K)$, and in the related
ones, is constructed beyond the scope of the quark-gluon approach. The model
satisfies unitarity and analyticity and uses as a "priming" the anomalous
non-diagonal $VPPP$ interaction which couples together the four channels
$\rho\pi$, $\eta\pi$, $ \eta'\pi$, and $K^*\bar K+\bar K^*K$. The possibility
of the resonance-like behavior of the $I^G(J^{PC})=1^-(1^{-+})$ amplitudes
belonging to the $\{10\}- \{\bar{10}\}$ and $\{8\}$ representations of SU(3) as
well as their mixing is demonstrated explicitly in the 1.3--1.6 GeV mass range
which, according to the current experiments, is really rich in exotics.
|
[
{
"created": "Wed, 10 Oct 2001 10:18:13 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Achasov",
"N. N.",
"",
"Institute for Mathematics,\n Novosibirsk, Russia"
],
[
"Shestakov",
"G. N.",
"",
"Institute for Mathematics,\n Novosibirsk, Russia"
]
] |
A simple dynamical model for the exotic waves with $I^G(J^{PC})=1^-(1^{-+})$ in the reactions $\rho\pi\to\rho\pi$, $\rho\pi\to\eta\pi$, $\rho\pi\to\eta'\pi$, $ \rho\pi\to(K^*\bar K+\bar K^*K)$, and in the related ones, is constructed beyond the scope of the quark-gluon approach. The model satisfies unitarity and analyticity and uses as a "priming" the anomalous non-diagonal $VPPP$ interaction which couples together the four channels $\rho\pi$, $\eta\pi$, $ \eta'\pi$, and $K^*\bar K+\bar K^*K$. The possibility of the resonance-like behavior of the $I^G(J^{PC})=1^-(1^{-+})$ amplitudes belonging to the $\{10\}- \{\bar{10}\}$ and $\{8\}$ representations of SU(3) as well as their mixing is demonstrated explicitly in the 1.3--1.6 GeV mass range which, according to the current experiments, is really rich in exotics.
|
hep-ph/9606417
|
J. Gunion
|
V. Barger (Wisconsin), M.S. Berger (Indiana), J.F. Gunion (U.C.
Davis), T. Han (U.C. Davis)
|
Studying a Strongly Interacting Electroweak Sector via Longitudinal
Gauge Boson Scattering at a Muon Collider
|
34 pages, uuencoded tex file and postscript figure files submitted,
full postscript file, including embedded figures, is available via anonymous
ftp at ftp://ucdhep.ucdavis.edu/gunion/strongw_mupmum.ps
|
Phys.Rev.D55:142-154,1997
|
10.1103/PhysRevD.55.142
|
UCD-96-19
|
hep-ph hep-ex
| null |
We discuss the excellent prospects for a detailed study of a strongly
interacting electroweak sector at a muon collider with c.m. energy $\rts\sim
4\tev$. For expected luminosity of $L=200-1000\fbi$ per year, $\mup\mum$ and
$\mup\mup$ (or $\mum\mum$) collisions can be used to study longitudinal
$\wp\wm$ and $\wp\wp$ (or $\wm\wm$) scattering with considerable precision. In
particular, detailed measurements of the distribution in the $VV$ pair masses
($V=\wpm,Z$) will be possible. The shape and magnitude of these distributions
will provide a powerful tool for determining the nature of strong gauge boson
interactions. Event rates will be large enough that projection techniques can
be used to directly isolate final states with different polarizations of the
$V$'s and verify that the strong interaction cross section excess is mainly in
the longitudinal-longitudinal mode.
|
[
{
"created": "Mon, 24 Jun 1996 02:21:10 GMT",
"version": "v1"
}
] |
2009-09-15
|
[
[
"Barger",
"V.",
"",
"Wisconsin"
],
[
"Berger",
"M. S.",
"",
"Indiana"
],
[
"Gunion",
"J. F.",
"",
"U.C.\n Davis"
],
[
"Han",
"T.",
"",
"U.C. Davis"
]
] |
We discuss the excellent prospects for a detailed study of a strongly interacting electroweak sector at a muon collider with c.m. energy $\rts\sim 4\tev$. For expected luminosity of $L=200-1000\fbi$ per year, $\mup\mum$ and $\mup\mup$ (or $\mum\mum$) collisions can be used to study longitudinal $\wp\wm$ and $\wp\wp$ (or $\wm\wm$) scattering with considerable precision. In particular, detailed measurements of the distribution in the $VV$ pair masses ($V=\wpm,Z$) will be possible. The shape and magnitude of these distributions will provide a powerful tool for determining the nature of strong gauge boson interactions. Event rates will be large enough that projection techniques can be used to directly isolate final states with different polarizations of the $V$'s and verify that the strong interaction cross section excess is mainly in the longitudinal-longitudinal mode.
|
1305.1645
|
Benjamin Fuks
|
Benjamin Fuks, Michael Klasen, David R. Lamprea, Marcel Rothering
|
QCD resummation in the framework of supersymmetry
|
4 pages, 2 figures, contribution to the proceedings of Moriond QCD
2013
| null | null |
CERN-PH-TH/2013-096, IPHC-PHENO-13-04, MS-TP-13-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by current searches for electroweak superpartners at the Large
Hadron Collider, we present precision predictions for pair production of such
particles in the framework of the Minimal Supersymmetric Standard Model. We
make use of various QCD resummation formalisms and match the results to pure
perturbative QCD computations. We study the impact of scale variations and
compare our results to predictions obtained by means of traditionally used
Monte Carlo event generators.
|
[
{
"created": "Tue, 7 May 2013 21:05:36 GMT",
"version": "v1"
}
] |
2013-05-09
|
[
[
"Fuks",
"Benjamin",
""
],
[
"Klasen",
"Michael",
""
],
[
"Lamprea",
"David R.",
""
],
[
"Rothering",
"Marcel",
""
]
] |
Motivated by current searches for electroweak superpartners at the Large Hadron Collider, we present precision predictions for pair production of such particles in the framework of the Minimal Supersymmetric Standard Model. We make use of various QCD resummation formalisms and match the results to pure perturbative QCD computations. We study the impact of scale variations and compare our results to predictions obtained by means of traditionally used Monte Carlo event generators.
|
2407.16386
|
Francesco Grippa
|
Francesco Grippa, Gaetano Lambiase and Tanmay Kumar Poddar
|
Constraints on scalar and vector dark matter admixed neutron stars with
linear and quadratic couplings
|
33 pages, 12 figures, 2 tables, comments are welcome
| null | null | null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the effect of dark matter scalar and vector-mediated interactions on
dark matter admixed neutron stars. In particular, we exploit the two-fluid
formalism of Tolman-Oppenheimer-Volkoff equations as generic framework for dark
matter admixed neutron stars. The fluids couple to each other only by gravity.
In particular, the baryonic sector is described by the BSk22 equation of state,
whereas we employ a relativistic mean field model for the dark matter, where we
include the interaction of dark massive fermions with light dark scalar and
vector mediators. We consider both the linear and the quadratic scalar
interactions with the dark fermion. In the quadratic scalar scenario, we take
into account a quartic self-interaction that significantly affects the stellar
properties. Interestingly, in both cases, the effect of the scalar coupling is
smaller than that of the vector, though quantitative differences arise. We also
compute the sound speed of DM, finding that the scalar and quadratic couplings
have an important influence on it. We compare our results with GW1708017,
GW190425 and NICER data and constrain DM couplings and mass.
|
[
{
"created": "Tue, 23 Jul 2024 11:19:57 GMT",
"version": "v1"
}
] |
2024-07-24
|
[
[
"Grippa",
"Francesco",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Poddar",
"Tanmay Kumar",
""
]
] |
We study the effect of dark matter scalar and vector-mediated interactions on dark matter admixed neutron stars. In particular, we exploit the two-fluid formalism of Tolman-Oppenheimer-Volkoff equations as generic framework for dark matter admixed neutron stars. The fluids couple to each other only by gravity. In particular, the baryonic sector is described by the BSk22 equation of state, whereas we employ a relativistic mean field model for the dark matter, where we include the interaction of dark massive fermions with light dark scalar and vector mediators. We consider both the linear and the quadratic scalar interactions with the dark fermion. In the quadratic scalar scenario, we take into account a quartic self-interaction that significantly affects the stellar properties. Interestingly, in both cases, the effect of the scalar coupling is smaller than that of the vector, though quantitative differences arise. We also compute the sound speed of DM, finding that the scalar and quadratic couplings have an important influence on it. We compare our results with GW1708017, GW190425 and NICER data and constrain DM couplings and mass.
|
2212.10089
|
Marcela Pel\'aez
|
Marcela Pel\'aez, Urko Reinosa, Julien Serreau and Nicol\'as Wschebor
|
Small parameters in infrared QCD: The pion decay constant
|
21 pages, 11 figures
| null |
10.1103/PhysRevD.107.054025
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We continue our investigation of the QCD dynamics in terms of the
Curci-Ferrari effective Lagrangian, a deformation of the Faddeev-Popov one in
the Landau gauge with a tree-level gluon mass term. In a previous work we have
studied the dynamics of chiral symmetry breaking at the level of the quark
propagator and, in particular, the dynamical generation of a constituent quark
mass. In the present article, we study the associated Goldstone mode, the pion,
and we compute the pion decay constant in the chiral limit. Our approach
exploits the fact that the coupling (defined in the Taylor scheme) in the pure
gauge sector is perturbative, as observed in lattice simulations which,
together with a $1/N_c$-expansion, allows for a systematic, controllable
approximation scheme in the low energy regime of QCD. At leading order, this
leads to the well-known rainbow-ladder resummation. We study the region of
parameter space of the model that gives physical values of the pion decay
constant. This allows one to constrain the gluon mass parameter as a function
of the coupling using a physically measured quantity.
|
[
{
"created": "Tue, 20 Dec 2022 09:04:52 GMT",
"version": "v1"
}
] |
2023-03-29
|
[
[
"Peláez",
"Marcela",
""
],
[
"Reinosa",
"Urko",
""
],
[
"Serreau",
"Julien",
""
],
[
"Wschebor",
"Nicolás",
""
]
] |
We continue our investigation of the QCD dynamics in terms of the Curci-Ferrari effective Lagrangian, a deformation of the Faddeev-Popov one in the Landau gauge with a tree-level gluon mass term. In a previous work we have studied the dynamics of chiral symmetry breaking at the level of the quark propagator and, in particular, the dynamical generation of a constituent quark mass. In the present article, we study the associated Goldstone mode, the pion, and we compute the pion decay constant in the chiral limit. Our approach exploits the fact that the coupling (defined in the Taylor scheme) in the pure gauge sector is perturbative, as observed in lattice simulations which, together with a $1/N_c$-expansion, allows for a systematic, controllable approximation scheme in the low energy regime of QCD. At leading order, this leads to the well-known rainbow-ladder resummation. We study the region of parameter space of the model that gives physical values of the pion decay constant. This allows one to constrain the gluon mass parameter as a function of the coupling using a physically measured quantity.
|
hep-ph/0607147
|
Yukihiro Mimura
|
Bhaskar Dutta and Yukihiro Mimura
|
B(s)-B(s)bar Mixing in Supersymmetric Grand Unified Models
|
5 pages, 3 figures. Modifications in the text and the title,
references added, results unchanged, to appear in PRL
|
Phys.Rev.Lett.97:241802,2006
|
10.1103/PhysRevLett.97.241802
|
MIFP-06-18
|
hep-ph
| null |
We study B_s-\bar{B}_s mixing in grand unified SO(10), SU(5) models where the
mixings among the second and third generation squarks arise due to the
existence of flavor violating sources in the Dirac and Majorana couplings which
are responsible for neutrino mixings. We find that when the branching ratio of
tau->mu gamma decay is enhanced to be around the current experimental bound,
B_s-\bar{B}_s mixing may also contain large contribution from supersymmetry in
the SO(10) boundary condition. Consequently, the phase of B_s-\bar{B}_s mixing
is large (especially for small tan beta and large scalar mass m_0) and can be
tested by measuring CP asymmetries of B_s decay modes.
|
[
{
"created": "Wed, 12 Jul 2006 20:45:44 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Nov 2006 21:08:04 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Dutta",
"Bhaskar",
""
],
[
"Mimura",
"Yukihiro",
""
]
] |
We study B_s-\bar{B}_s mixing in grand unified SO(10), SU(5) models where the mixings among the second and third generation squarks arise due to the existence of flavor violating sources in the Dirac and Majorana couplings which are responsible for neutrino mixings. We find that when the branching ratio of tau->mu gamma decay is enhanced to be around the current experimental bound, B_s-\bar{B}_s mixing may also contain large contribution from supersymmetry in the SO(10) boundary condition. Consequently, the phase of B_s-\bar{B}_s mixing is large (especially for small tan beta and large scalar mass m_0) and can be tested by measuring CP asymmetries of B_s decay modes.
|
2303.01548
|
Gonzalo Villa
|
Francesco Muia, Fernando Quevedo, Andreas Schachner, Gonzalo Villa
|
Testing BSM Physics with Gravitational Waves
|
16 pages + appendix, 7 figures v2: minor edits, references added.
Matches published version
|
JCAP 09 (2023) 006
|
10.1088/1475-7516/2023/09/006
| null |
hep-ph astro-ph.CO gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
The Cosmic Gravitational Wave Background (CGWB) is an irreducible background
of gravitational waves generated by particle exchange in the early Universe
plasma. Standard Model particles contribute to such a stochastic background
with a peak at $f\sim 80$ GHz. Any physics beyond the Standard Model (BSM) may
modify the CGWB spectrum, making it a potential testing ground for BSM physics.
We consider the impact of general BSM scenarios on the CGWB, including an
arbitrary number of hidden sectors. We find that the largest amplitude of the
CGWB comes from the sector that dominates the energy density after reheating
and confirm the dominance of the SM for standard cosmological histories. For
non-standard cosmological histories, such as those with a stiff equation of
state $\omega >1/3$, like in kination, BSM physics may dominate and modify the
spectrum substantially. We conclude that, if the CGWB is detected at lower
frequencies and amplitudes compared to that of the SM, it will hint at extra
massive degrees of freedom or hidden sectors. If it is instead measured at
higher values, it will imply a period with $\omega >1/3$. We argue that for
scenarios with periods of kination in the early Universe, a significant
fraction of the parameter space can be ruled out from dark radiation bounds at
BBN.
|
[
{
"created": "Thu, 2 Mar 2023 19:29:09 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 17:20:47 GMT",
"version": "v2"
}
] |
2023-09-12
|
[
[
"Muia",
"Francesco",
""
],
[
"Quevedo",
"Fernando",
""
],
[
"Schachner",
"Andreas",
""
],
[
"Villa",
"Gonzalo",
""
]
] |
The Cosmic Gravitational Wave Background (CGWB) is an irreducible background of gravitational waves generated by particle exchange in the early Universe plasma. Standard Model particles contribute to such a stochastic background with a peak at $f\sim 80$ GHz. Any physics beyond the Standard Model (BSM) may modify the CGWB spectrum, making it a potential testing ground for BSM physics. We consider the impact of general BSM scenarios on the CGWB, including an arbitrary number of hidden sectors. We find that the largest amplitude of the CGWB comes from the sector that dominates the energy density after reheating and confirm the dominance of the SM for standard cosmological histories. For non-standard cosmological histories, such as those with a stiff equation of state $\omega >1/3$, like in kination, BSM physics may dominate and modify the spectrum substantially. We conclude that, if the CGWB is detected at lower frequencies and amplitudes compared to that of the SM, it will hint at extra massive degrees of freedom or hidden sectors. If it is instead measured at higher values, it will imply a period with $\omega >1/3$. We argue that for scenarios with periods of kination in the early Universe, a significant fraction of the parameter space can be ruled out from dark radiation bounds at BBN.
|
0812.2489
|
Manuel Toharia
|
Aleksandr Azatov, Manuel Toharia and Lijun Zhu
|
Radion Mediated Flavor Changing Neutral Currents
|
4 pages, 2 figures, 1 table
|
Phys.Rev.D80:031701,2009
|
10.1103/PhysRevD.80.031701
|
UMD-PP-08-22
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of a warped extra-dimension with Standard Model fields in the
bulk, we obtain the general flavor structure of the Radion couplings to
fermions and show that the result is independent on the particular nature of
the Higgs mechanism (bulk or brane localized). These couplings will be
generically misaligned with respect to the fermion mass matrix when the fermion
bulk mass parameters are not all degenerate. When the Radion is light enough,
the generic size of these tree-level flavor changing couplings will be strongly
constrained by the experimental bounds on $\Delta F=2$ processes. At the LHC
the possibility of a heavier Radion decaying into top and charm quarks is then
considered as a promising signal to probe the flavor structure of both the
Radion sector and the whole scenario.
|
[
{
"created": "Fri, 12 Dec 2008 21:48:58 GMT",
"version": "v1"
}
] |
2010-04-30
|
[
[
"Azatov",
"Aleksandr",
""
],
[
"Toharia",
"Manuel",
""
],
[
"Zhu",
"Lijun",
""
]
] |
In the context of a warped extra-dimension with Standard Model fields in the bulk, we obtain the general flavor structure of the Radion couplings to fermions and show that the result is independent on the particular nature of the Higgs mechanism (bulk or brane localized). These couplings will be generically misaligned with respect to the fermion mass matrix when the fermion bulk mass parameters are not all degenerate. When the Radion is light enough, the generic size of these tree-level flavor changing couplings will be strongly constrained by the experimental bounds on $\Delta F=2$ processes. At the LHC the possibility of a heavier Radion decaying into top and charm quarks is then considered as a promising signal to probe the flavor structure of both the Radion sector and the whole scenario.
|
0901.1750
|
Sarah Andreas
|
Sarah Andreas, Michel H.G. Tytgat and Quentin Swillens
|
Neutrinos from Inert Doublet Dark Matter
|
25 pages, 13 figures; v2: minor changes, more detailed discussion on
capture, conclusions unchanged, matches published version (JCAP)
|
JCAP 0904:004,2009
|
10.1088/1475-7516/2009/04/004
|
ULB-TH/09-02
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the signatures of neutrinos produced in the annihilation of
WIMP dark matter in the Earth, the Sun and at the Galactic centre within the
framework of the Inert Doublet Model and extensions. We consider a dark matter
candidate, that we take to be one of the neutral components of an extra Higgs
doublet, in three distinct mass ranges, which have all been shown previously to
be consistent with both WMAP abundance and direct detection experiments
exclusion limits. Specifically, we consider a light WIMP with mass between 4
and 8 GeV (low), a WIMP with mass around 60-70 GeV (middle) and a heavy WIMP
with mass above 500 GeV (high). In the first case, we show that capture in the
Sun may be constrained using Super-Kamiokande data. In the last two cases, we
argue that indirect detection through neutrinos is challenging but not
altogether excluded. For middle masses, we try to make the most benefit of the
proximity of the so-called 'iron resonance' that might enhance the capture of
the dark matter candidate by the Earth. The signal from the Earth is further
enhanced if light right-handed Majorana neutrinos are introduced, in which case
the scalar dark matter candidate may annihilate into pairs of mono-energetic
neutrinos. In the case of high masses, detection of neutrinos from the Galactic
centre might be possible, provided the dark matter abundance is substantially
boosted.
|
[
{
"created": "Tue, 13 Jan 2009 18:05:32 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2009 13:06:18 GMT",
"version": "v2"
}
] |
2010-01-05
|
[
[
"Andreas",
"Sarah",
""
],
[
"Tytgat",
"Michel H. G.",
""
],
[
"Swillens",
"Quentin",
""
]
] |
We investigate the signatures of neutrinos produced in the annihilation of WIMP dark matter in the Earth, the Sun and at the Galactic centre within the framework of the Inert Doublet Model and extensions. We consider a dark matter candidate, that we take to be one of the neutral components of an extra Higgs doublet, in three distinct mass ranges, which have all been shown previously to be consistent with both WMAP abundance and direct detection experiments exclusion limits. Specifically, we consider a light WIMP with mass between 4 and 8 GeV (low), a WIMP with mass around 60-70 GeV (middle) and a heavy WIMP with mass above 500 GeV (high). In the first case, we show that capture in the Sun may be constrained using Super-Kamiokande data. In the last two cases, we argue that indirect detection through neutrinos is challenging but not altogether excluded. For middle masses, we try to make the most benefit of the proximity of the so-called 'iron resonance' that might enhance the capture of the dark matter candidate by the Earth. The signal from the Earth is further enhanced if light right-handed Majorana neutrinos are introduced, in which case the scalar dark matter candidate may annihilate into pairs of mono-energetic neutrinos. In the case of high masses, detection of neutrinos from the Galactic centre might be possible, provided the dark matter abundance is substantially boosted.
|
1911.00552
|
Jacob Barandes
|
Jacob A. Barandes
|
On Magnetic Forces and Work
|
9 pages, no figures
|
Foundations of Physics, 51(4):79, July 2021
|
10.1007/s10701-021-00483-4
| null |
hep-ph hep-th physics.class-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We address a long-standing debate over whether classical magnetic forces can
do work, ultimately answering the question in the affirmative. In detail, we
couple a classical particle with intrinsic spin and elementary dipole moments
to the electromagnetic field, derive the appropriate generalization of the
Lorentz force law, show that the particle's dipole moments must be collinear
with its spin axis, and argue that the magnetic field does mechanical work on
the particle's elementary magnetic dipole moment. As consistency checks, we
calculate the overall system's energy-momentum and angular momentum, and show
that their local conservation equations lead to the same force law and
therefore the same conclusions about magnetic forces and work. We also compute
the system's Belinfante-Rosenfeld energy-momentum tensor.
|
[
{
"created": "Fri, 1 Nov 2019 18:48:56 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2023 23:29:12 GMT",
"version": "v2"
}
] |
2023-07-28
|
[
[
"Barandes",
"Jacob A.",
""
]
] |
We address a long-standing debate over whether classical magnetic forces can do work, ultimately answering the question in the affirmative. In detail, we couple a classical particle with intrinsic spin and elementary dipole moments to the electromagnetic field, derive the appropriate generalization of the Lorentz force law, show that the particle's dipole moments must be collinear with its spin axis, and argue that the magnetic field does mechanical work on the particle's elementary magnetic dipole moment. As consistency checks, we calculate the overall system's energy-momentum and angular momentum, and show that their local conservation equations lead to the same force law and therefore the same conclusions about magnetic forces and work. We also compute the system's Belinfante-Rosenfeld energy-momentum tensor.
|
hep-ph/9912354
|
Leonard Lesniak
|
R. Kaminski, L. Lesniak and K. Rybicki
|
Further study of the pi-pi S-wave isoscalar amplitude below the K - Kbar
threshold
|
15 pages, 4 figures (added Fig.2)
|
ActaPhys.Polon.B31:895-908,2000
| null |
INP 1837/PH, Dec. 1999
|
hep-ph
| null |
We continue the analysis of S-wave production amplitudes for the reaction pi-
p -> pi+ pi- n involving the data obtained by the CERN--Cracow-Munich
collaboration on a transversely polarized target at 17.2 GeV/c pi- momentum.
This study deals with the region below the K - Kbar threshold. In particular,
we study the "up-steep" solution containing a narrow S-wave resonance under the
rho(770). This solution exhibits a considerable inelasticity (eta) which does
not have any physical interpretation. Assuming that this inelasticity behaviour
represents an unlikely fluctuation we impose eta = 1 for all data points. This
leads to non-physical results in one third of the pi+pi- effective mass bins
and in the remaining mass bins some parameters behave in a queer way. The
situation is even worse for the "down-steep" solution. We conclude that the
17.2 GeV data cannot be described by a relatively narrow f0(750). The
"down-flat" and "up-steep" solutions which easily pass the eta = 1 constraint
exhibit a slow increase of phase shifts in the rho(770) mass range.
|
[
{
"created": "Wed, 15 Dec 1999 13:44:02 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 1999 13:04:04 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kaminski",
"R.",
""
],
[
"Lesniak",
"L.",
""
],
[
"Rybicki",
"K.",
""
]
] |
We continue the analysis of S-wave production amplitudes for the reaction pi- p -> pi+ pi- n involving the data obtained by the CERN--Cracow-Munich collaboration on a transversely polarized target at 17.2 GeV/c pi- momentum. This study deals with the region below the K - Kbar threshold. In particular, we study the "up-steep" solution containing a narrow S-wave resonance under the rho(770). This solution exhibits a considerable inelasticity (eta) which does not have any physical interpretation. Assuming that this inelasticity behaviour represents an unlikely fluctuation we impose eta = 1 for all data points. This leads to non-physical results in one third of the pi+pi- effective mass bins and in the remaining mass bins some parameters behave in a queer way. The situation is even worse for the "down-steep" solution. We conclude that the 17.2 GeV data cannot be described by a relatively narrow f0(750). The "down-flat" and "up-steep" solutions which easily pass the eta = 1 constraint exhibit a slow increase of phase shifts in the rho(770) mass range.
|
1105.2842
|
Andrea Ferroglia
|
A. Sirlin
|
Radiative Correction to the anti-nu_e (nu_e) Spectrum in beta-Decay
|
Sentences added at the end of the conclusions, additional reference
included, two typographical errors in the text corrected. 8 pages
|
Phys.Rev.D84:014021,2011
|
10.1103/PhysRevD.84.014021
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive an analytic expression for the O(alpha) radiative correction to the
anti-nu_e (nu_e) spectrum in allowed beta-decay. The m -> 0 limit is convergent
and leads to a very simple result (m is the electron mass). This is in sharp
contrast to the correction to the e^- (e^+) spectrum, that diverges as m -> 0,
an important difference that we explain on theoretical grounds. After
discussing some of their general properties, we use the corrections to the
anti-nu_e and e^- spectra to derive the corresponding correction to the e^- ->
anti-nu_e conversion, a relation that is of considerable interest for reactor
studies of neutrino oscillations.
|
[
{
"created": "Fri, 13 May 2011 21:33:09 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2011 19:42:53 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Sirlin",
"A.",
""
]
] |
We derive an analytic expression for the O(alpha) radiative correction to the anti-nu_e (nu_e) spectrum in allowed beta-decay. The m -> 0 limit is convergent and leads to a very simple result (m is the electron mass). This is in sharp contrast to the correction to the e^- (e^+) spectrum, that diverges as m -> 0, an important difference that we explain on theoretical grounds. After discussing some of their general properties, we use the corrections to the anti-nu_e and e^- spectra to derive the corresponding correction to the e^- -> anti-nu_e conversion, a relation that is of considerable interest for reactor studies of neutrino oscillations.
|
1812.01096
|
Fernando Serna A
|
Fernando E. Serna, Chen Chen, and Bruno El-Bennich
|
Interplay of dynamical and explicit chiral symmetry breaking effects on
a quark
| null |
Phys. Rev. D 99, 094027 (2019)
|
10.1103/PhysRevD.99.094027
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The relative contributions of explicit and dynamical chiral symmetry breaking
in QCD models of the quark-gap equation are studied in dependence of frequently
employed ans\"atze for the dressed interaction and quark-gluon vertex. The
explicit symmetry breaking contributions are defined by a constituent-quark
sigma term whereas the combined effects of explicit and dynamical symmetry
breaking are described by a Euclidean constituent-mass solution. We extend this
study of the gap equation to a quark-gluon vertex beyond the Abelian
approximation complemented with numerical gluon- and ghost-dressing functions
from lattice QCD. We find that the ratio of the sigma term over the Euclidean
mass is largely independent of nonperturbative interaction and vertex models
for current-quark masses, $m_{u,d}(\mu) \leq m(\mu) \leq m_b(\mu)$, and equal
contributions of explicit and dynamical chiral symmetry breaking occur at
$m(\mu) \approx 400$~MeV. For massive solutions of the gap equation with
lattice propagators this value decreases to about 200~MeV.
|
[
{
"created": "Mon, 3 Dec 2018 21:58:46 GMT",
"version": "v1"
},
{
"created": "Wed, 22 May 2019 18:25:45 GMT",
"version": "v2"
}
] |
2019-05-29
|
[
[
"Serna",
"Fernando E.",
""
],
[
"Chen",
"Chen",
""
],
[
"El-Bennich",
"Bruno",
""
]
] |
The relative contributions of explicit and dynamical chiral symmetry breaking in QCD models of the quark-gap equation are studied in dependence of frequently employed ans\"atze for the dressed interaction and quark-gluon vertex. The explicit symmetry breaking contributions are defined by a constituent-quark sigma term whereas the combined effects of explicit and dynamical symmetry breaking are described by a Euclidean constituent-mass solution. We extend this study of the gap equation to a quark-gluon vertex beyond the Abelian approximation complemented with numerical gluon- and ghost-dressing functions from lattice QCD. We find that the ratio of the sigma term over the Euclidean mass is largely independent of nonperturbative interaction and vertex models for current-quark masses, $m_{u,d}(\mu) \leq m(\mu) \leq m_b(\mu)$, and equal contributions of explicit and dynamical chiral symmetry breaking occur at $m(\mu) \approx 400$~MeV. For massive solutions of the gap equation with lattice propagators this value decreases to about 200~MeV.
|
1304.6183
|
Eugenio Del Nobile
|
Eugenio Del Nobile, Graciela B. Gelmini, Paolo Gondolo, and Ji-Haeng
Huh
|
Halo-independent analysis of direct detection data for light WIMPs
|
15 pages, 17 figures; v2: XENON10 bound corrected and minor changes
in the text. v3: text and figures improved, accepted for publication in JCAP
| null |
10.1088/1475-7516/2013/10/026
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a halo-independent analysis of direct detection data on "light
WIMPs," i.e. weakly interacting massive particles with mass close to or below
10 GeV/c^2. We include new results from silicon CDMS detectors (bounds and
excess events), the latest CoGeNT acceptances, and recent measurements of low
sodium quenching factors in NaI crystals. We focus on light WIMPs with
spin-independent isospin-conserving and isospin-violating interactions with
nucleons. For these dark matter candidates we find that a low quenching factor
would make the DAMA modulation incompatible with a reasonable escape velocity
for the dark matter halo, and that the tension among experimental data tightens
in both the isospin-conserving and isospin-violating scenarios. We also find
that a new although milder tension appears between the CoGeNT and DAMA annual
modulations on one side and the silicon excess events on the other, in that it
seems difficult to interpret them as the modulated and unmodulated aspects of
the same WIMP dark matter signal.
|
[
{
"created": "Tue, 23 Apr 2013 06:55:46 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2013 07:45:45 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Sep 2013 20:02:45 GMT",
"version": "v3"
}
] |
2015-06-15
|
[
[
"Del Nobile",
"Eugenio",
""
],
[
"Gelmini",
"Graciela B.",
""
],
[
"Gondolo",
"Paolo",
""
],
[
"Huh",
"Ji-Haeng",
""
]
] |
We present a halo-independent analysis of direct detection data on "light WIMPs," i.e. weakly interacting massive particles with mass close to or below 10 GeV/c^2. We include new results from silicon CDMS detectors (bounds and excess events), the latest CoGeNT acceptances, and recent measurements of low sodium quenching factors in NaI crystals. We focus on light WIMPs with spin-independent isospin-conserving and isospin-violating interactions with nucleons. For these dark matter candidates we find that a low quenching factor would make the DAMA modulation incompatible with a reasonable escape velocity for the dark matter halo, and that the tension among experimental data tightens in both the isospin-conserving and isospin-violating scenarios. We also find that a new although milder tension appears between the CoGeNT and DAMA annual modulations on one side and the silicon excess events on the other, in that it seems difficult to interpret them as the modulated and unmodulated aspects of the same WIMP dark matter signal.
|
1809.02748
|
Nobuhito Maru
|
Yuki Adachi and Nobuhito Maru
|
Triple Higgs Boson Coupling in Gauge-Higgs Unification
|
10 pages, 1 figure, Additional explanation on our results added(v2)
| null | null |
OCU-PHYS-486
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the triple coupling of the Higgs boson in the context of the
gauge-Higgs unification scenario. We show that the triple coupling of the Higgs
boson in this scenario generically deviates from SM prediction since the Higgs
potential in this scenario has a periodicity. We calculate the coupling in the
five-dimensional $SU(3)$ x $U(1)_X$ gauge-Higgs unification model and obtain
70% deviation from the SM prediction.
|
[
{
"created": "Sat, 8 Sep 2018 03:04:02 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Dec 2018 08:03:26 GMT",
"version": "v2"
}
] |
2018-12-05
|
[
[
"Adachi",
"Yuki",
""
],
[
"Maru",
"Nobuhito",
""
]
] |
We consider the triple coupling of the Higgs boson in the context of the gauge-Higgs unification scenario. We show that the triple coupling of the Higgs boson in this scenario generically deviates from SM prediction since the Higgs potential in this scenario has a periodicity. We calculate the coupling in the five-dimensional $SU(3)$ x $U(1)_X$ gauge-Higgs unification model and obtain 70% deviation from the SM prediction.
|
1502.04564
|
Anthony Hartin
|
Anthony Hartin
|
Furry picture transition rates in the intense fields at a lepton
collider interaction point
|
7 pages, 5 figures, Phys Lett B preprint
|
Phys Lett B, 743 (2015) 166-171
|
10.1016/j.physletb.2015.02.035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effect on particle physics processes by intense electromagnetic fields in
the charge bunch collisions at future lepton colliders is considered. Since the
charge bunch fields are tied to massive sources (the $e^{+}e^{-}$ charges), a
reference frame is chosen in which the fields appear to be co-propagating.
Solutions of the Dirac equation minimally coupled to the electromagnetic fields
reasonably associated with two intense overlapping charge bunches are obtained
and found to be a Volkov solution with respect to a null 4-vector whose
3-vector part lies in the common propagation direction. These solutions are
used within the Furry interaction picture to calculate the beamstrahlung
transition rate for electron radiation due to interaction with the
electromagnetic fields of two colliding charge bunches. New analytic
expressions are obtained and compared numerically with the beamstrahlung in the
electromagnetic field of one charge bunch. The techniques developed will be
applied to other collider physics processes in due course.
|
[
{
"created": "Mon, 16 Feb 2015 15:00:53 GMT",
"version": "v1"
}
] |
2015-03-03
|
[
[
"Hartin",
"Anthony",
""
]
] |
The effect on particle physics processes by intense electromagnetic fields in the charge bunch collisions at future lepton colliders is considered. Since the charge bunch fields are tied to massive sources (the $e^{+}e^{-}$ charges), a reference frame is chosen in which the fields appear to be co-propagating. Solutions of the Dirac equation minimally coupled to the electromagnetic fields reasonably associated with two intense overlapping charge bunches are obtained and found to be a Volkov solution with respect to a null 4-vector whose 3-vector part lies in the common propagation direction. These solutions are used within the Furry interaction picture to calculate the beamstrahlung transition rate for electron radiation due to interaction with the electromagnetic fields of two colliding charge bunches. New analytic expressions are obtained and compared numerically with the beamstrahlung in the electromagnetic field of one charge bunch. The techniques developed will be applied to other collider physics processes in due course.
|
1608.01850
|
Kirill Semenov-Tian-Shansky
|
Dieter M\"uller and Kirill Semenov-Tian-Shansky
|
On the equivalence of GPD representations
|
A contribution into the Proceedings of QUARKS-2016 19th International
Seminar on High Energy Physics, Pushkin, Russia, 29 May - 4 June, 2016
| null |
10.1051/epjconf/201612504020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Phenomenological representations of generalized parton distributions (GPDs)
implementing the non-trivial field theoretical requirements are employed in the
present day strategies for extracting of hadron structure information encoded
in GPDs from the observables of hard exclusive reactions. Showing out the
equivalence of various GPD representations can help to get more insight into
GPD properties and allow to build up flexible GPD models capable of
satisfactory description of the whole set of available experimental data. We
review the mathematical aspects of establishing equivalence between the the
double partial wave expansion of GPDs in the conformal partial waves and in the
$t$-channel ${\rm SO}(3)$ partial waves and the double distribution
representation of GPDs.
|
[
{
"created": "Fri, 5 Aug 2016 12:17:01 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Müller",
"Dieter",
""
],
[
"Semenov-Tian-Shansky",
"Kirill",
""
]
] |
Phenomenological representations of generalized parton distributions (GPDs) implementing the non-trivial field theoretical requirements are employed in the present day strategies for extracting of hadron structure information encoded in GPDs from the observables of hard exclusive reactions. Showing out the equivalence of various GPD representations can help to get more insight into GPD properties and allow to build up flexible GPD models capable of satisfactory description of the whole set of available experimental data. We review the mathematical aspects of establishing equivalence between the the double partial wave expansion of GPDs in the conformal partial waves and in the $t$-channel ${\rm SO}(3)$ partial waves and the double distribution representation of GPDs.
|
hep-ph/9809480
|
Un-Ki Yang
|
U.K. Yang and A. Bodek
|
Parton Distributions, d/u, and Higher Twist Effects at High X
|
4pages, 7 figures, Talk given at 29th International Conference on
High-energy Physics, Vancouver, Canada, July 1998. Submitted to Phys. Rev.
Lett
|
Phys.Rev.Lett.82:2467-2470,1999
|
10.1103/PhysRevLett.82.2467
|
UR-1543, ER-40685-929
|
hep-ph hep-ex
| null |
A re-analysis of the NMC and SLAC data leads to a great improvement in our
knowledge of the valence d and u parton distribution functions at high x.
Standard parton distributions with our modifications are in good agreement with
QCD predictions for d/u at x=1, and with the CDHSW nu p and nubar p data, the
HERA charged current cross section data, the collider high-P_t jet data, and
the CDF W asymmetry data. With the inclusion of target mass and higher twist
corrections, the modified PDF's also describe all DIS data up to x = 0.98 and
down to Q^2 = 1 GeV^2.
|
[
{
"created": "Tue, 22 Sep 1998 17:35:02 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 1998 02:20:18 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Feb 1999 22:01:31 GMT",
"version": "v3"
},
{
"created": "Sat, 21 Aug 1999 18:32:36 GMT",
"version": "v4"
}
] |
2011-02-01
|
[
[
"Yang",
"U. K.",
""
],
[
"Bodek",
"A.",
""
]
] |
A re-analysis of the NMC and SLAC data leads to a great improvement in our knowledge of the valence d and u parton distribution functions at high x. Standard parton distributions with our modifications are in good agreement with QCD predictions for d/u at x=1, and with the CDHSW nu p and nubar p data, the HERA charged current cross section data, the collider high-P_t jet data, and the CDF W asymmetry data. With the inclusion of target mass and higher twist corrections, the modified PDF's also describe all DIS data up to x = 0.98 and down to Q^2 = 1 GeV^2.
|
1305.5715
|
Daren Zhou
|
Daren Zhou, Rob G. E. Timmermans
|
Polarization observables in low-energy antiproton-proton scattering
| null |
Phys. Rev. C 87, 054005 (2013)
|
10.1103/PhysRevC.87.054005
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the polarization parameters in low-energy antiproton-proton
elastic ($\bar{p}p\rightarrow\bar{p}p$) and charge-exchange
($\bar{p}p\rightarrow\bar{n}n$) scattering. The predictions for unmeasured
observables are based on our new energy-dependent partial-wave analysis of all
antiproton-proton scattering data below 925 MeV/$c$ antiproton laboratory
momentum, which gives an optimal description of the existing database. Sizable
and remarkable spin effects are observed, in particular for charge-exchange
scattering. These result from the spin dependence of the long- and medium-range
one- and two-pion exchange antinucleon-nucleon potential and the state
dependence of the parametrized short-range interaction. We study the
possibility of polarizing a circulating antiproton beam with a polarized proton
target by exploiting the spin dependence of the $\bar{p}p$ total cross section.
It appears feasible to achieve a significant transverse polarization of an
antiproton beam within a reasonable time.
|
[
{
"created": "Fri, 24 May 2013 12:48:37 GMT",
"version": "v1"
}
] |
2013-05-27
|
[
[
"Zhou",
"Daren",
""
],
[
"Timmermans",
"Rob G. E.",
""
]
] |
We investigate the polarization parameters in low-energy antiproton-proton elastic ($\bar{p}p\rightarrow\bar{p}p$) and charge-exchange ($\bar{p}p\rightarrow\bar{n}n$) scattering. The predictions for unmeasured observables are based on our new energy-dependent partial-wave analysis of all antiproton-proton scattering data below 925 MeV/$c$ antiproton laboratory momentum, which gives an optimal description of the existing database. Sizable and remarkable spin effects are observed, in particular for charge-exchange scattering. These result from the spin dependence of the long- and medium-range one- and two-pion exchange antinucleon-nucleon potential and the state dependence of the parametrized short-range interaction. We study the possibility of polarizing a circulating antiproton beam with a polarized proton target by exploiting the spin dependence of the $\bar{p}p$ total cross section. It appears feasible to achieve a significant transverse polarization of an antiproton beam within a reasonable time.
|
1811.05002
|
Daisuke Hagihara
|
Daisuke Hagihara, Koichi Hamaguchi and Kazunori Nakayama
|
Moduli Oscillation Induced by Reheating
|
26 pages, 5 figures, 1 table; v2: version published in JCAP
|
JCAP03(2019)024
|
10.1088/1475-7516/2019/03/024
|
UT-18-26, IPMU18-0188
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We estimate the abundance of the coherent oscillation of moduli, which
linearly couple to matter fields through higher dimensional operators. During
the (p)reheating after inflation, matter particles are efficiently produced and
it can affect the moduli potential in a non-adiabatic way, which results in the
coherent oscillation of the moduli. In particular, such effects are most
important at the very beginning of the (p)reheating. It is found that this
production mechanism is so efficient that a successful evolution of the
universe can be threatened even if the moduli mass is larger than the Hubble
scale.
|
[
{
"created": "Mon, 12 Nov 2018 21:06:11 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2019 08:59:11 GMT",
"version": "v2"
}
] |
2019-03-18
|
[
[
"Hagihara",
"Daisuke",
""
],
[
"Hamaguchi",
"Koichi",
""
],
[
"Nakayama",
"Kazunori",
""
]
] |
We estimate the abundance of the coherent oscillation of moduli, which linearly couple to matter fields through higher dimensional operators. During the (p)reheating after inflation, matter particles are efficiently produced and it can affect the moduli potential in a non-adiabatic way, which results in the coherent oscillation of the moduli. In particular, such effects are most important at the very beginning of the (p)reheating. It is found that this production mechanism is so efficient that a successful evolution of the universe can be threatened even if the moduli mass is larger than the Hubble scale.
|
2111.07076
|
Jason Aebischer
|
Jason Aebischer, Benjam\'in Grinstein
|
The $B_c$ lifetime in the Standard Model
|
5 pages, Contribution to the proceedings of the 22nd Particles and
Nuclei International Conference (PANIC21), 5-10 September 2021
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using an operator product expansion (OPE) approach an updated Standard Model
prediction of the $B_c$ lifetime is presented. The computation in three
different mass schemes for the heavy quarks leads to three different values
consistent with each other and with experiment. Furthermore a novel way to
compute the $B_c$ lifetime is presented, taking differences of $B,D$ and $B_c$
meson decay rates. In this approach the leading contributions from free-quark
decays cancel out, leading to a reduction of scale and scheme dependence.
|
[
{
"created": "Sat, 13 Nov 2021 09:41:40 GMT",
"version": "v1"
}
] |
2021-11-16
|
[
[
"Aebischer",
"Jason",
""
],
[
"Grinstein",
"Benjamín",
""
]
] |
Using an operator product expansion (OPE) approach an updated Standard Model prediction of the $B_c$ lifetime is presented. The computation in three different mass schemes for the heavy quarks leads to three different values consistent with each other and with experiment. Furthermore a novel way to compute the $B_c$ lifetime is presented, taking differences of $B,D$ and $B_c$ meson decay rates. In this approach the leading contributions from free-quark decays cancel out, leading to a reduction of scale and scheme dependence.
|
2103.04605
|
Wangmei Zha
|
Wangmei Zha, Zebo Tang
|
Discovery of higher order QED effect for the vacuum pair production
| null | null |
10.1007/JHEP08(2021)083
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The higher order quantum electrodynamics (QED) effect for vacuum pair
production has been searched without success since 1954. In this paper, we show
that the lowest order QED calculations for lepton pair vacuum production in
heavy-ion collisions are about 20$\%$ higher than the combined world-wide data
with a seven sigma-level of significance and the corresponding higher order QED
results are consistent with data. We claim the discovery of higher order effect
for the QED pair production, which settles the dust of previous debates for
several decades. The verification of higher order QED effect is a fundamental
scientific problem, which is an important milestone towards the nonperturbative
and nonlinear regime of QED vacuum.
|
[
{
"created": "Mon, 8 Mar 2021 08:55:22 GMT",
"version": "v1"
}
] |
2021-09-15
|
[
[
"Zha",
"Wangmei",
""
],
[
"Tang",
"Zebo",
""
]
] |
The higher order quantum electrodynamics (QED) effect for vacuum pair production has been searched without success since 1954. In this paper, we show that the lowest order QED calculations for lepton pair vacuum production in heavy-ion collisions are about 20$\%$ higher than the combined world-wide data with a seven sigma-level of significance and the corresponding higher order QED results are consistent with data. We claim the discovery of higher order effect for the QED pair production, which settles the dust of previous debates for several decades. The verification of higher order QED effect is a fundamental scientific problem, which is an important milestone towards the nonperturbative and nonlinear regime of QED vacuum.
|
1112.5155
|
Mathias Garny
|
Mathias Garny, Alejandro Ibarra, Stefan Vogl
|
Dark matter annihilations into two light fermions and one gauge boson:
general analysis and antiproton constraints
|
39 pages, 10 figures; v2: minor changes, matches published version;
v3: typo corrected
| null |
10.1088/1475-7516/2012/04/033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study in this paper the scenario where the dark matter is constituted by
Majorana particles which couple to a light Standard Model fermion and an extra
scalar via a Yukawa coupling. In this scenario, the annihilation rate into the
light fermions with the mediation of the scalar particle is strongly suppressed
by the mass of the fermion. Nevertheless, the helicity suppression is lifted by
the associated emission of a gauge boson, yielding annihilation rates which
could be large enough to allow the indirect detection of the dark matter
particles. We perform a general analysis of this scenario, calculating the
annihilation cross section of the processes \chi\chi\rightarrow f\bar f V when
the dark matter particle is a SU(2)_L singlet or doublet, f is a lepton or a
quark, and V is a photon, a weak gauge boson or a gluon. We point out that the
annihilation rate is particularly enhanced when the dark matter particle is
degenerate in mass to the intermediate scalar particle, which is a scenario
barely constrained by collider searches of exotic charged or colored particles.
Lastly, we derive upper limits on the relevant cross sections from the
non-observation of an excess in the cosmic antiproton-to-proton ratio measured
by PAMELA.
|
[
{
"created": "Wed, 21 Dec 2011 20:57:28 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2012 09:28:24 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jul 2013 17:14:35 GMT",
"version": "v3"
}
] |
2015-06-03
|
[
[
"Garny",
"Mathias",
""
],
[
"Ibarra",
"Alejandro",
""
],
[
"Vogl",
"Stefan",
""
]
] |
We study in this paper the scenario where the dark matter is constituted by Majorana particles which couple to a light Standard Model fermion and an extra scalar via a Yukawa coupling. In this scenario, the annihilation rate into the light fermions with the mediation of the scalar particle is strongly suppressed by the mass of the fermion. Nevertheless, the helicity suppression is lifted by the associated emission of a gauge boson, yielding annihilation rates which could be large enough to allow the indirect detection of the dark matter particles. We perform a general analysis of this scenario, calculating the annihilation cross section of the processes \chi\chi\rightarrow f\bar f V when the dark matter particle is a SU(2)_L singlet or doublet, f is a lepton or a quark, and V is a photon, a weak gauge boson or a gluon. We point out that the annihilation rate is particularly enhanced when the dark matter particle is degenerate in mass to the intermediate scalar particle, which is a scenario barely constrained by collider searches of exotic charged or colored particles. Lastly, we derive upper limits on the relevant cross sections from the non-observation of an excess in the cosmic antiproton-to-proton ratio measured by PAMELA.
|
hep-ph/0107304
|
Alon Faraggi
|
Claudio Coriano, Alon E. Faraggi
|
SUSY Scaling Violations and UHECR
|
7 pages. 3 figures. Presented by C. Coriano at the Intl. Workshop
``QCD @ work'', Martina Franca, Italy 16-20 June 2001
|
AIP Conf.Proc. 602 (2001) 145-149
|
10.1063/1.1435922
|
OUTP-01-40P; UNILE-CBR-2001-5
|
hep-ph astro-ph hep-th
| null |
Advancing QCD toward astroparticle applications generates new challenges for
perturbation theory, such as the presence of large evolution scales with
sizeable scaling violations involving both the initial and the final state of a
collision. Possible applications in the context of Ultra High Energy Cosmic
Rays (UHECR) of these effects are discussed.
|
[
{
"created": "Mon, 30 Jul 2001 14:31:22 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Coriano",
"Claudio",
""
],
[
"Faraggi",
"Alon E.",
""
]
] |
Advancing QCD toward astroparticle applications generates new challenges for perturbation theory, such as the presence of large evolution scales with sizeable scaling violations involving both the initial and the final state of a collision. Possible applications in the context of Ultra High Energy Cosmic Rays (UHECR) of these effects are discussed.
|
0801.1939
|
Mojtaba Mohammadi Najafabadi
|
Mojtaba Mohammadi Najafabadi
|
Probing of $Wtb$ Anomalous Couplings via the $tW$ Channel of Single Top
Production
|
11 pages, 4 figures
|
JHEP 0803:024,2008
|
10.1088/1126-6708/2008/03/024
| null |
hep-ph
| null |
The potential of LHC for investigation of the $W$-$t$-$b$ vertex through the
$tW$ channel of single top quark production is studied. Unlike the other two
single top quark production processes ($t-$channel and $s-$channel), the $tW$
channel provides the possibility to study the $Wtb$ vertex without receiving
contamination from FCNC. This study has been done at parton level but is
involved the separation of signal from backgrounds when both $W$-bosons decay
to leptons. In this study $\mathcal{CP}$ is assumed to be conserved. The 68%
C.L. bounds on the non-Standard Model couplings are estimated.
|
[
{
"created": "Sun, 13 Jan 2008 07:14:01 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Feb 2008 09:03:34 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Mar 2008 08:25:09 GMT",
"version": "v3"
}
] |
2009-01-06
|
[
[
"Najafabadi",
"Mojtaba Mohammadi",
""
]
] |
The potential of LHC for investigation of the $W$-$t$-$b$ vertex through the $tW$ channel of single top quark production is studied. Unlike the other two single top quark production processes ($t-$channel and $s-$channel), the $tW$ channel provides the possibility to study the $Wtb$ vertex without receiving contamination from FCNC. This study has been done at parton level but is involved the separation of signal from backgrounds when both $W$-bosons decay to leptons. In this study $\mathcal{CP}$ is assumed to be conserved. The 68% C.L. bounds on the non-Standard Model couplings are estimated.
|
hep-ph/0308098
|
Jozef Dudek
|
F.E. Close & J.J. Dudek
|
Hybrid meson production by electromagnetic and weak interactions in a
flux-tube simulation of lattice QCD
|
uses psfrag; One reference corrected
|
Phys.Rev.D69:034010,2004
|
10.1103/PhysRevD.69.034010
| null |
hep-ph
| null |
We calculate rates for hybrid meson production by electromagnetic and weak
interactions in the flux-tube model. Applications include photo and
electroproduction at Jefferson Laboratory and HERA, and the production of light
strange and charmed hybrids in the weak decays of heavy flavours.
Photoproduction of some light hybrids is predicted to be prominent in charge
exchange reactions, $\gamma p \to n \cal{H}$ and accessible in $\gamma p \to p
\cal{H}$. Production of light or charmed hybrids in $B$ and $D$ decays may be
feasible with high statistics. Photoproduction of the axial hybrid meson is
predicted to be large courtesy of $\pi$ exchange, and its strange counterpart
is predicted in $B \to \psi K_H(1^+)$ with $b.r. \sim 10^{-4}$. Production
rates for exotic hybrid candidates $1^{-+};(0,2)^{+-}$ are given special
attention. Selection rules that can help to distinguish between hybrid and
conventional states with the same $J^{PC}$ are noted.
|
[
{
"created": "Fri, 8 Aug 2003 10:38:11 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Aug 2003 13:24:57 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Close",
"F. E.",
""
],
[
"Dudek",
"J. J.",
""
]
] |
We calculate rates for hybrid meson production by electromagnetic and weak interactions in the flux-tube model. Applications include photo and electroproduction at Jefferson Laboratory and HERA, and the production of light strange and charmed hybrids in the weak decays of heavy flavours. Photoproduction of some light hybrids is predicted to be prominent in charge exchange reactions, $\gamma p \to n \cal{H}$ and accessible in $\gamma p \to p \cal{H}$. Production of light or charmed hybrids in $B$ and $D$ decays may be feasible with high statistics. Photoproduction of the axial hybrid meson is predicted to be large courtesy of $\pi$ exchange, and its strange counterpart is predicted in $B \to \psi K_H(1^+)$ with $b.r. \sim 10^{-4}$. Production rates for exotic hybrid candidates $1^{-+};(0,2)^{+-}$ are given special attention. Selection rules that can help to distinguish between hybrid and conventional states with the same $J^{PC}$ are noted.
|
hep-ph/9808403
|
Cosmin Macesanu
|
C. Macesanu, L. H. Orr
|
Gluon Radiation in Top Quark Production and Decay at an e^+ e^- Collider
|
9 pages, LaTeX, 6 postscript figures, uses aipproc.sty; presented at
the 20th annual MRST meeting on High-Energy Physics, Montreal, Canada, 13-15
May 1998
| null |
10.1063/1.57081
|
UR-1542
|
hep-ph
| null |
We study the effects of gluon radiation on top production and decay processes
at an $e^+e^-$ collider.The matrix elements are computed without any
approximations, using spinor techniques. We use a Monte Carlo event generator
which takes into account the infrared singularity due to soft gluons and
differences in kinematics associated with radiation in the production versus
decay process. The calculation is illustrated for several strategies of top
mass reconstruction.
|
[
{
"created": "Mon, 24 Aug 1998 20:14:06 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Macesanu",
"C.",
""
],
[
"Orr",
"L. H.",
""
]
] |
We study the effects of gluon radiation on top production and decay processes at an $e^+e^-$ collider.The matrix elements are computed without any approximations, using spinor techniques. We use a Monte Carlo event generator which takes into account the infrared singularity due to soft gluons and differences in kinematics associated with radiation in the production versus decay process. The calculation is illustrated for several strategies of top mass reconstruction.
|
hep-ph/9311323
|
Stephan
|
F. J. Yndurain
|
On the Evaluation of Threshold Effects in Processes Involving Heavy
Quarks
|
12 pages, preprint FTUAM 38/93
|
Phys.Lett.B321:400-406,1994
|
10.1016/0370-2693(94)90266-6
| null |
hep-ph
| null |
A detailed evaluation is presented of production of heavy fermions
(particularly ttbar quarks) by a vector current, in the region around
threshold. This includes bound states as well as the region above threshold, to
the same degree of accuracy; in both cases radiative and nonperturbative
corrections are included. The contribution of this region to the vacuum
polarization (``threshold effects'') is calculated and compared with a
perturbative calculation; the importance of the threshold effects is found
substantially smaller than claimed by some authors. Open fermion-antifermion
production is also discussed.
|
[
{
"created": "Sat, 20 Nov 1993 18:16:06 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Yndurain",
"F. J.",
""
]
] |
A detailed evaluation is presented of production of heavy fermions (particularly ttbar quarks) by a vector current, in the region around threshold. This includes bound states as well as the region above threshold, to the same degree of accuracy; in both cases radiative and nonperturbative corrections are included. The contribution of this region to the vacuum polarization (``threshold effects'') is calculated and compared with a perturbative calculation; the importance of the threshold effects is found substantially smaller than claimed by some authors. Open fermion-antifermion production is also discussed.
|
hep-ph/0009141
|
Hidekazu Yokomakura
|
H. Yokomakura, K. Kimura, A. Takamura
|
Matter Enhancement of T Violation in Neutrino Oscillation
|
11 pages, 10 figures, corrected some typos
|
Phys.Lett. B496 (2000) 175-184
|
10.1016/S0370-2693(00)01288-0
|
DPNU-00-30
|
hep-ph
| null |
We study the matter enhancement of T violation in neutrino oscillation with
three generations. The magnitude of T violation is proportional to Jarlskog
factor J. Recently, the elegant relation,
(\Delta_m)_{12}(\Delta_m)_{23}(\Delta_m)_{31}J_{m} =
\Delta_{12}\Delta_{23}\Delta_{31}J, was derived, where \Delta_{ij}=\Delta
m^2_{ij}/(2E) and subscript m implies the quantities in matter. Using this
relation, we reconsider how J_m changes as a function of the matter potential a
under the approximation |\Delta m^2_{12}| \ll |\Delta m^2_{13}|. We show that
the number of maxima for J_{m} depends on the magnitude of \sin^2 2 \theta_{13}
and there are two maxima considering the constraint on \sin^2 2\theta_{13} from
the CHOOZ experiment. One maximum of $J_{m} at a = O(\Delta_{12}) is given by
J/\sin2\theta_{12}, which leads to the large enhancement of J_m in the case of
the SMA MSW solution. The other maximum at a = O(\Delta_{13}) is
|\Delta_{12}/\Delta_{13}|J/\sin2\theta_{13}, and the enhancement is possible,
if \sin 2 \theta_{13} is small enough. These maximal values are consistent with
the results obtained by other methods.
|
[
{
"created": "Tue, 12 Sep 2000 13:28:31 GMT",
"version": "v1"
},
{
"created": "Fri, 3 May 2002 12:13:46 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Yokomakura",
"H.",
""
],
[
"Kimura",
"K.",
""
],
[
"Takamura",
"A.",
""
]
] |
We study the matter enhancement of T violation in neutrino oscillation with three generations. The magnitude of T violation is proportional to Jarlskog factor J. Recently, the elegant relation, (\Delta_m)_{12}(\Delta_m)_{23}(\Delta_m)_{31}J_{m} = \Delta_{12}\Delta_{23}\Delta_{31}J, was derived, where \Delta_{ij}=\Delta m^2_{ij}/(2E) and subscript m implies the quantities in matter. Using this relation, we reconsider how J_m changes as a function of the matter potential a under the approximation |\Delta m^2_{12}| \ll |\Delta m^2_{13}|. We show that the number of maxima for J_{m} depends on the magnitude of \sin^2 2 \theta_{13} and there are two maxima considering the constraint on \sin^2 2\theta_{13} from the CHOOZ experiment. One maximum of $J_{m} at a = O(\Delta_{12}) is given by J/\sin2\theta_{12}, which leads to the large enhancement of J_m in the case of the SMA MSW solution. The other maximum at a = O(\Delta_{13}) is |\Delta_{12}/\Delta_{13}|J/\sin2\theta_{13}, and the enhancement is possible, if \sin 2 \theta_{13} is small enough. These maximal values are consistent with the results obtained by other methods.
|
0906.3417
|
Giacomo Cacciapaglia
|
Giacomo Cacciapaglia, Aldo Deandrea (IPN Lyon) and Stefania De Curtis
(INFN Firenze)
|
Nearby resonances beyond the Breit-Wigner approximation
|
14 pages, 3 figures
|
Phys.Lett.B682:43-49,2009
|
10.1016/j.physletb.2009.10.090
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a description of propagators for particle resonances which takes
into account the quantum mechanical interference due to the width of two or
more nearby states that have common decay channels, by incorporating the
effects arising from the imaginary parts of the one-loop self-energies.
Depending on the couplings to the common decay channels, the interference
effect, not taken into account in the usual Breit-Wigner approximation, can
significantly modify the cross section or make the more long-lived resonance
narrower. We give few examples of New Physics models for which the effect is
sizable, namely a generic two and multiple Higgs model and neutral vector
resonances in Higgsless models. Based on these results we suggest the
implementation of a proper treatment of nearby resonances into Monte Carlo
generators.
|
[
{
"created": "Thu, 18 Jun 2009 13:38:35 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2009 13:58:05 GMT",
"version": "v2"
}
] |
2009-11-18
|
[
[
"Cacciapaglia",
"Giacomo",
"",
"IPN Lyon"
],
[
"Deandrea",
"Aldo",
"",
"IPN Lyon"
],
[
"De Curtis",
"Stefania",
"",
"INFN Firenze"
]
] |
We consider a description of propagators for particle resonances which takes into account the quantum mechanical interference due to the width of two or more nearby states that have common decay channels, by incorporating the effects arising from the imaginary parts of the one-loop self-energies. Depending on the couplings to the common decay channels, the interference effect, not taken into account in the usual Breit-Wigner approximation, can significantly modify the cross section or make the more long-lived resonance narrower. We give few examples of New Physics models for which the effect is sizable, namely a generic two and multiple Higgs model and neutral vector resonances in Higgsless models. Based on these results we suggest the implementation of a proper treatment of nearby resonances into Monte Carlo generators.
|
1208.5527
|
Chi-Sing Lam
|
C. S. Lam
|
Finite Symmetry of Leptonic Mass Matrices
|
Version to appear in Physical Review D
| null |
10.1103/PhysRevD.87.013001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We search for possible symmetries present in the leptonic mixing data from
SU(3) subgroups of order up to 511. Theoretical results based on symmetry are
compared with global fits of experimental data in a chi-squared analysis,
yielding the following results. There is no longer a group that can produce all
the mixing data without a free parameter, but a number of them can accommodate
the first or the second column of the mixing matrix. The only group that fits
the third column is $\Delta(150)$. It predicts $\sin^22\theta_{13}=0.11$ and
$\sin^22\theta_{23}=0.94$, in good agreement with experimental results.
|
[
{
"created": "Mon, 27 Aug 2012 22:49:57 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Dec 2012 05:09:23 GMT",
"version": "v2"
}
] |
2015-06-11
|
[
[
"Lam",
"C. S.",
""
]
] |
We search for possible symmetries present in the leptonic mixing data from SU(3) subgroups of order up to 511. Theoretical results based on symmetry are compared with global fits of experimental data in a chi-squared analysis, yielding the following results. There is no longer a group that can produce all the mixing data without a free parameter, but a number of them can accommodate the first or the second column of the mixing matrix. The only group that fits the third column is $\Delta(150)$. It predicts $\sin^22\theta_{13}=0.11$ and $\sin^22\theta_{23}=0.94$, in good agreement with experimental results.
|
1211.2818
|
Yiming Xu
|
A. Liam Fitzpatrick, Wick Haxton, Emanuel Katz, Nicholas Lubbers,
Yiming Xu
|
Model Independent Direct Detection Analyses
|
25 pages, 11 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Following the construction of the general effective theory for dark matter
direct detection in 1203.3542, we perform an analysis of the experimental
constraints on the full parameter space of elastically scattering dark matter.
We review the prescription for calculating event rates in the general effective
theory and discuss the sensitivity of various experiments to additional nuclear
responses beyond the spin-independent (SI) and spin-dependent (SD) couplings:
an angular-momentum-dependent (LD) and spin-and-angular-momentum-dependent
(LSD) response, as well as a distinction between transverse and longitudinal
spin-dependent responses. We consider the effect of interference between
different operators and in particular look at directions in parameter space
where such cancellations lead to holes in the sensitivity of individual
experiments. We explore the complementarity of different experiments by looking
at the improvement of bounds when experiments are combined. Finally, our scan
through parameter space shows that within the assumptions on models and on the
experiments' sensitivity that we make, no elastically scattering dark matter
explanation of DAMA is consistent with all other experiments at 90%, though we
find points in parameter space that are ruled out only by about a factor of 2
in the cross-section.
|
[
{
"created": "Mon, 12 Nov 2012 21:00:28 GMT",
"version": "v1"
}
] |
2012-11-14
|
[
[
"Fitzpatrick",
"A. Liam",
""
],
[
"Haxton",
"Wick",
""
],
[
"Katz",
"Emanuel",
""
],
[
"Lubbers",
"Nicholas",
""
],
[
"Xu",
"Yiming",
""
]
] |
Following the construction of the general effective theory for dark matter direct detection in 1203.3542, we perform an analysis of the experimental constraints on the full parameter space of elastically scattering dark matter. We review the prescription for calculating event rates in the general effective theory and discuss the sensitivity of various experiments to additional nuclear responses beyond the spin-independent (SI) and spin-dependent (SD) couplings: an angular-momentum-dependent (LD) and spin-and-angular-momentum-dependent (LSD) response, as well as a distinction between transverse and longitudinal spin-dependent responses. We consider the effect of interference between different operators and in particular look at directions in parameter space where such cancellations lead to holes in the sensitivity of individual experiments. We explore the complementarity of different experiments by looking at the improvement of bounds when experiments are combined. Finally, our scan through parameter space shows that within the assumptions on models and on the experiments' sensitivity that we make, no elastically scattering dark matter explanation of DAMA is consistent with all other experiments at 90%, though we find points in parameter space that are ruled out only by about a factor of 2 in the cross-section.
|
0906.2950
|
Pavel Fileviez Perez
|
Pavel Fileviez Perez, Mark B. Wise
|
On the Origin of Neutrino Masses
|
9 pages, minor corrections and typos corrected
|
Phys.Rev.D80:053006,2009
|
10.1103/PhysRevD.80.053006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the simplest mechanisms for generating neutrino masses at tree
level and one loop level. We find a significant number of new possibilities
where one can generate neutrino masses at the one-loop level by adding only two
new types of representations. These models have renormalizable interactions
that automatically conserve baryon number. Adding to the minimal standard model
a scalar color octet with SU(3) X SU(2) X U(1) quantum numbers, (8,2,1/2), and
a fermionic color octet in the fundamental or adjoint representation of SU(2)
one can generate neutrino masses in agreement with the experiment. Signals at
the LHC, and constraints from flavour violation are briefly discussed.
|
[
{
"created": "Tue, 16 Jun 2009 16:03:38 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2009 21:21:18 GMT",
"version": "v2"
}
] |
2009-09-09
|
[
[
"Perez",
"Pavel Fileviez",
""
],
[
"Wise",
"Mark B.",
""
]
] |
We discuss the simplest mechanisms for generating neutrino masses at tree level and one loop level. We find a significant number of new possibilities where one can generate neutrino masses at the one-loop level by adding only two new types of representations. These models have renormalizable interactions that automatically conserve baryon number. Adding to the minimal standard model a scalar color octet with SU(3) X SU(2) X U(1) quantum numbers, (8,2,1/2), and a fermionic color octet in the fundamental or adjoint representation of SU(2) one can generate neutrino masses in agreement with the experiment. Signals at the LHC, and constraints from flavour violation are briefly discussed.
|
hep-ph/9701263
|
Antonio Pich
|
A. Pich
|
Lepton Universality
|
21 pages, latex, 6 Postscript figures, Lectures at the Cargese'96
School --Masses of Fundamental Particles-- (Cargese, Corsica, 5-17 August
1996
|
NATO Adv.Study Inst.Ser.B Phys.363:173-190,1997
| null |
FTUV/97-02, IFIC/97-02
|
hep-ph
| null |
The Standard Model requires the three known leptonic families to have
identical couplings to the gauge bosons. The present experimental tests on
lepton universality are reviewed, both for the charged and neutral current
sectors. Our knowledge about the Lorentz structure of the $l^-\to\nu_l
l'^-\bar\nu_{l'}$ transition amplitudes is also discussed.
|
[
{
"created": "Fri, 10 Jan 1997 13:43:26 GMT",
"version": "v1"
}
] |
2009-02-16
|
[
[
"Pich",
"A.",
""
]
] |
The Standard Model requires the three known leptonic families to have identical couplings to the gauge bosons. The present experimental tests on lepton universality are reviewed, both for the charged and neutral current sectors. Our knowledge about the Lorentz structure of the $l^-\to\nu_l l'^-\bar\nu_{l'}$ transition amplitudes is also discussed.
|
1310.5414
|
Xu Qingjun
|
Qing-jun Xu, Shu-sheng Xu, Zhen-jun Xiao and Li-gang Jin
|
The loop effects on the chargino decays $\tilde{\chi}_1^\pm\to
\tilde{\chi}_1^0 f f^\prime$ in the MSSM
|
13 pages, 3 figures
| null |
10.1007/s11434-014-0289-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lighter chargino three body decays $\tilde{\chi}_1^\pm\to
\tilde{\chi}_1^0 f f^\prime$ via the $W^\pm$ boson and the charged Higgs boson
$H^\pm$ are studied in the R-parity conserved Minimal Supersymmetric Standard
Model (MSSM). We treat $\tilde \chi_1^\pm$ decays as production and decay of
$W^\pm$ and $H^\pm$: i.e., $\tilde{\chi}_1^\pm \to \tilde{\chi}_1^0 W^\pm
(H^\pm) \to \tilde{\chi}_1^0 f f^\prime$. Both higgsino-like and wino-like
$\tilde \chi_1^\pm$ decays are well investigated. These decays are calculated
at 1-loop level and the loop corrections are found to be less than three
percent.The signal of the charged Higgs $H^\pm$ production from $\tilde
\chi_1^\pm$ decays are discussed. It will offer important information about the
chargino and neutralino sector, as well as the charged Higgs sector in the
MSSM.
|
[
{
"created": "Mon, 21 Oct 2013 03:45:33 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Dec 2013 15:10:19 GMT",
"version": "v2"
}
] |
2014-04-23
|
[
[
"Xu",
"Qing-jun",
""
],
[
"Xu",
"Shu-sheng",
""
],
[
"Xiao",
"Zhen-jun",
""
],
[
"Jin",
"Li-gang",
""
]
] |
The lighter chargino three body decays $\tilde{\chi}_1^\pm\to \tilde{\chi}_1^0 f f^\prime$ via the $W^\pm$ boson and the charged Higgs boson $H^\pm$ are studied in the R-parity conserved Minimal Supersymmetric Standard Model (MSSM). We treat $\tilde \chi_1^\pm$ decays as production and decay of $W^\pm$ and $H^\pm$: i.e., $\tilde{\chi}_1^\pm \to \tilde{\chi}_1^0 W^\pm (H^\pm) \to \tilde{\chi}_1^0 f f^\prime$. Both higgsino-like and wino-like $\tilde \chi_1^\pm$ decays are well investigated. These decays are calculated at 1-loop level and the loop corrections are found to be less than three percent.The signal of the charged Higgs $H^\pm$ production from $\tilde \chi_1^\pm$ decays are discussed. It will offer important information about the chargino and neutralino sector, as well as the charged Higgs sector in the MSSM.
|
hep-ph/9209297
| null |
C.J. Fewster and B.S. Kay
|
Model Dependence of Baryon Decay Enhancement by Cosmic Strings
|
20 pages, LaTeX, DAMTP-R92/28
|
Nucl.Phys.B399:89-110,1993
|
10.1016/0550-3213(93)90618-Y
| null |
hep-ph hep-th
| null |
Cosmic strings arising from GUTs can catalyse baryon decay processes with
strong interaction cross sections. We examine the mechanism by which the cross
section is enhanced and find that it depends strongly on the details of the
distribution of gauge fields within the string core. We propose a calculational
scheme for estimating wavefunction amplification factors and also a physical
understanding of the nature of the enhancement process.
|
[
{
"created": "Wed, 30 Sep 1992 11:26:41 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Fewster",
"C. J.",
""
],
[
"Kay",
"B. S.",
""
]
] |
Cosmic strings arising from GUTs can catalyse baryon decay processes with strong interaction cross sections. We examine the mechanism by which the cross section is enhanced and find that it depends strongly on the details of the distribution of gauge fields within the string core. We propose a calculational scheme for estimating wavefunction amplification factors and also a physical understanding of the nature of the enhancement process.
|
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