id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.0565 | Sachiko Takeuchi | Sachiko Takeuchi and Kiyotaka Shimizu | Lambda(1405) as a Resonance in the Baryon-Meson Scattering Coupled to
the q^3 State in a Quark Model | 16 pages and 7 figures | Phys.Rev.C76:035204,2007 | 10.1103/PhysRevC.76.035204 | null | hep-ph | null | In order to describe Lambda(1405) as a resonance in the baryon-meson
scattering, we have investigated q^3-q qbar scattering system with the
flavor-singlet q^3 (0s)^2(0p) state (the Lambda^1 pole). The scattering is
treated by the quark cluster model (QCM). The Lambda^1 pole is treated as a
bound state embedded in the continuum. We found that the peak appears below the
N Kbar threshold in the spin one half, isospin 0 channel even if the mass of
the Lambda^1 pole is above the threshold. This peak disappears when the
coupling to the Lambda^1 pole is switched off. To use the observed hadron mass
in the kinetic part of QCM is also found to be important to reproduce a peak
just below the N Kbar threshold.
| [
{
"created": "Fri, 4 May 2007 07:04:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Takeuchi",
"Sachiko",
""
],
[
"Shimizu",
"Kiyotaka",
""
]
] | In order to describe Lambda(1405) as a resonance in the baryon-meson scattering, we have investigated q^3-q qbar scattering system with the flavor-singlet q^3 (0s)^2(0p) state (the Lambda^1 pole). The scattering is treated by the quark cluster model (QCM). The Lambda^1 pole is treated as a bound state embedded in the continuum. We found that the peak appears below the N Kbar threshold in the spin one half, isospin 0 channel even if the mass of the Lambda^1 pole is above the threshold. This peak disappears when the coupling to the Lambda^1 pole is switched off. To use the observed hadron mass in the kinetic part of QCM is also found to be important to reproduce a peak just below the N Kbar threshold. |
hep-ph/0610304 | Juan Jose Sanz-Cillero | J.J. Sanz-Cillero | Resonance Form-Factors: L8 Determination at Next-to-Leading Order in
1/NC | 3 pages, 1 figure; proceedings of the IVth International Conference
on Quarks and Nuclear Physics, Madrid, June 5-10 2006 | null | null | null | hep-ph | null | This talk presents a systematic procedure for the computation of the SS-PP
correlator beyond the large--NC limit. The present calculation is carried on
within a perturbative 1/NC framework . By constraining the meson form-factors
at leading order in 1/NC, one obtains a one-loop spectral function well behaved
at short distances. The Weinberg sum-rules get modified, gaining an extra
contribution suppressed by 1/NC. This leads to a prediction for the low energy
chiral perturbation theory coupling L8^r(mu) at the one-loop level, i.e., up to
next-to-leading order in 1/NC.
| [
{
"created": "Tue, 24 Oct 2006 06:00:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sanz-Cillero",
"J. J.",
""
]
] | This talk presents a systematic procedure for the computation of the SS-PP correlator beyond the large--NC limit. The present calculation is carried on within a perturbative 1/NC framework . By constraining the meson form-factors at leading order in 1/NC, one obtains a one-loop spectral function well behaved at short distances. The Weinberg sum-rules get modified, gaining an extra contribution suppressed by 1/NC. This leads to a prediction for the low energy chiral perturbation theory coupling L8^r(mu) at the one-loop level, i.e., up to next-to-leading order in 1/NC. |
hep-ph/9704434 | Eric S. Swanson | Eric S. Swanson and Adam P. Szczepaniak | Hybrid Decays | 13 pages, 1 table, revtex | Phys.Rev. D56 (1997) 5692-5695 | 10.1103/PhysRevD.56.5692 | null | hep-ph | null | The heavy quark expansion of Quantum Chromodynamics and the strong coupling
flux tube picture of nonperturbative glue are employed to develop the
phenomenology of hybrid meson decays. The decay mechanism explicitly couples
gluonic degrees of freedom to the pair produced quarks and hence does not obey
the well known, but model-dependent, selection rule which states that hybrids
do not decay to pairs of L=0 mesons. However, the nonperturbative nature of
gluonic excitations in the flux tube picture leads to a new selection rule:
light hybrids do not decay to pairs of identical mesons. New features of the
model are highlighted and partial widths are presented for several low lying
hybrid states.
| [
{
"created": "Tue, 29 Apr 1997 13:51:03 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Swanson",
"Eric S.",
""
],
[
"Szczepaniak",
"Adam P.",
""
]
] | The heavy quark expansion of Quantum Chromodynamics and the strong coupling flux tube picture of nonperturbative glue are employed to develop the phenomenology of hybrid meson decays. The decay mechanism explicitly couples gluonic degrees of freedom to the pair produced quarks and hence does not obey the well known, but model-dependent, selection rule which states that hybrids do not decay to pairs of L=0 mesons. However, the nonperturbative nature of gluonic excitations in the flux tube picture leads to a new selection rule: light hybrids do not decay to pairs of identical mesons. New features of the model are highlighted and partial widths are presented for several low lying hybrid states. |
1011.2112 | Lei Wang | Lei Wang, Xiao-Fang Han | Pseudoscalar boson and SM-like Higgs boson productions at LHC in
simplest little Higgs model | 15 pages, 6 figures. Accepted for publication in Phys. ReV. D | Phys.Rev.D82:095009,2010 | 10.1103/PhysRevD.82.095009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the simplest little Higgs model (SLHM), we perform a
comprehensive study for the pair productions of the pseudoscalar boson {\eta}
and SM-like Higgs boson h at LHC, namely gg(b\bar{b})-> {\eta}{\eta},
gg(q\bar{q})-> {\eta}h and gg(b\bar{b})-> hh. These production processes
provide a way to probe the couplings between Higgs bosons. We find that the
cross section of gg-> {\eta}{\eta} always dominates over that of b\bar{b}->
{\eta}{\eta}. When the Higgs boson h which mediates these two processes is
on-shell, their cross sections can reach several thousand $fb$ and several
hundred $fb$, respectively. When the intermediate state h is off-shell, those
two cross sections are reduced by two orders of magnitude, respectively. The
cross sections of gg-> {\eta}h and q\bar{q}-> {\eta}h are about in the same
order of magnitude, which can reach $\ord{(10^2fb)}$ for a light {\eta} boson.
Besides, compared with the SM prediction, the cross section of a pair of
SM-like Higgs bosons production at LHC can be enhanced sizably. Finally, we
briefly discuss the observable signatures of {\eta}{\eta}, {\eta}h and hh at
the LHC, respectively.
| [
{
"created": "Tue, 9 Nov 2010 15:14:57 GMT",
"version": "v1"
}
] | 2010-12-23 | [
[
"Wang",
"Lei",
""
],
[
"Han",
"Xiao-Fang",
""
]
] | In the framework of the simplest little Higgs model (SLHM), we perform a comprehensive study for the pair productions of the pseudoscalar boson {\eta} and SM-like Higgs boson h at LHC, namely gg(b\bar{b})-> {\eta}{\eta}, gg(q\bar{q})-> {\eta}h and gg(b\bar{b})-> hh. These production processes provide a way to probe the couplings between Higgs bosons. We find that the cross section of gg-> {\eta}{\eta} always dominates over that of b\bar{b}-> {\eta}{\eta}. When the Higgs boson h which mediates these two processes is on-shell, their cross sections can reach several thousand $fb$ and several hundred $fb$, respectively. When the intermediate state h is off-shell, those two cross sections are reduced by two orders of magnitude, respectively. The cross sections of gg-> {\eta}h and q\bar{q}-> {\eta}h are about in the same order of magnitude, which can reach $\ord{(10^2fb)}$ for a light {\eta} boson. Besides, compared with the SM prediction, the cross section of a pair of SM-like Higgs bosons production at LHC can be enhanced sizably. Finally, we briefly discuss the observable signatures of {\eta}{\eta}, {\eta}h and hh at the LHC, respectively. |
1704.04840 | Kentaro Kojima | Kentaro Kojima, Kazunori Takenaga and Toshifumi Yamashita | The Standard Model Gauge Symmetry from Higher-Rank Unified Groups in
Grand Gauge-Higgs Unification Models | 34 pages, 1 figure, clarifications added in Sec. 6, published version | null | 10.1007/JHEP06(2017)018 | KYUSHU-HET-176 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study grand unified models in the five-dimensional space-time where the
extra dimension is compactified on $S^1/Z_2$. The spontaneous breaking of
unified gauge symmetries is achieved via vacuum expectation values of the
extra-dimensional components of gauge fields. We derive one-loop effective
potentials for the zero modes of the gauge fields in SU(7), SU(8), SO(10), and
$E_6$ models. In each model, the rank of the residual gauge symmetry that
respects the boundary condition imposed at the orbifold fixed points is higher
than that of the standard model. We verify that the residual symmetry is broken
to the standard model gauge symmetry at the global minima of the effective
potential for certain sets of bulk fermion fields in each model.
| [
{
"created": "Mon, 17 Apr 2017 00:58:40 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2017 01:47:34 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Kojima",
"Kentaro",
""
],
[
"Takenaga",
"Kazunori",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] | We study grand unified models in the five-dimensional space-time where the extra dimension is compactified on $S^1/Z_2$. The spontaneous breaking of unified gauge symmetries is achieved via vacuum expectation values of the extra-dimensional components of gauge fields. We derive one-loop effective potentials for the zero modes of the gauge fields in SU(7), SU(8), SO(10), and $E_6$ models. In each model, the rank of the residual gauge symmetry that respects the boundary condition imposed at the orbifold fixed points is higher than that of the standard model. We verify that the residual symmetry is broken to the standard model gauge symmetry at the global minima of the effective potential for certain sets of bulk fermion fields in each model. |
2005.06219 | Peter Zeiler Skands | Nicholas Hunt-Smith and Peter Skands | String Fragmentation with a Time-Dependent Tension | v2: included predictions for strange baryons | null | 10.1140/epjc/s10052-020-08654-9 | MCNET-20-14, CoEPP-MN-20-4 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by recent theoretical arguments that expanding strings can be
regarded as having a temperature that is inversely proportional to the proper
time, tau, we investigate the consequences of adding a term proportional to
1/tau to the string tension in the Lund string-hadronization model. The lattice
value for the tension, kappa0 ~ 0.18 GeV^2 ~ 0.9 GeV/fm, is then interpreted as
the late-time/equilibrium limit. A generic prediction of this type of model is
that early string breaks should be associated with higher strangeness (and
baryon) fractions and higher fragmentation <pT> values. It should be possible
to use archival ee data sets to provide model-independent constraints on this
type of scenario, and we propose a few simple key measurements to do so.
| [
{
"created": "Wed, 13 May 2020 09:19:48 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2020 00:45:17 GMT",
"version": "v2"
}
] | 2020-12-30 | [
[
"Hunt-Smith",
"Nicholas",
""
],
[
"Skands",
"Peter",
""
]
] | Motivated by recent theoretical arguments that expanding strings can be regarded as having a temperature that is inversely proportional to the proper time, tau, we investigate the consequences of adding a term proportional to 1/tau to the string tension in the Lund string-hadronization model. The lattice value for the tension, kappa0 ~ 0.18 GeV^2 ~ 0.9 GeV/fm, is then interpreted as the late-time/equilibrium limit. A generic prediction of this type of model is that early string breaks should be associated with higher strangeness (and baryon) fractions and higher fragmentation <pT> values. It should be possible to use archival ee data sets to provide model-independent constraints on this type of scenario, and we propose a few simple key measurements to do so. |
1306.6420 | Dmitri Kazakov | D.I.Kazakov | SUSY Phenomenology today | 10 pages, 13 figures, PDFLatex, Talk at EW Rencontres de Moriond,
2013 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The review of the SUSY phenomenology today is given with the emphasis on
generic properties of SUSY models, SUSY searches at the LHC and in
astrophysics. Due to the absence of any definite SUSY signal at accelerators
and other experiments, we describe the allowed regions in the MSSM and NMSSM
parameter space and discuss the possibilities of SUSY manifestation in the near
future.
| [
{
"created": "Thu, 27 Jun 2013 07:13:41 GMT",
"version": "v1"
}
] | 2013-06-28 | [
[
"Kazakov",
"D. I.",
""
]
] | The review of the SUSY phenomenology today is given with the emphasis on generic properties of SUSY models, SUSY searches at the LHC and in astrophysics. Due to the absence of any definite SUSY signal at accelerators and other experiments, we describe the allowed regions in the MSSM and NMSSM parameter space and discuss the possibilities of SUSY manifestation in the near future. |
hep-ph/0401169 | Hyung Do Kim | Hyung Do Kim, Stuart Raby and Leslie Schradin | Quark Mass Textures and sin 2 beta | 1+20 pages, 2 figures, JHEP3 class | Phys.Rev. D69 (2004) 092002 | 10.1103/PhysRevD.69.092002 | OHSTPY-HEP-T-04-002 | hep-ph | null | Recent precise measurements of sin 2 beta from the B-factories (BABAR and
BELLE) and a better known strange quark mass from lattice QCD make precision
tests of predictive texture models possible. The models tested include those
hierarchical N-zero textures classified by Ramond, Roberts and Ross, as well as
any other hierarchical matrix Ansatz with non-zero 12 = 21 and vanishing 11 and
13 elements. We calculate the maximally allowed value for sin 2 beta in these
models and show that all the aforementioned models with vanishing 11 and 13
elements are ruled out at the 3 sigma level. While at present sin 2 beta and
|Vub/Vcb| are equally good for testing N-zero texture models, in the near
future the former will surpass the latter in constraining power.
| [
{
"created": "Thu, 22 Jan 2004 20:24:29 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kim",
"Hyung Do",
""
],
[
"Raby",
"Stuart",
""
],
[
"Schradin",
"Leslie",
""
]
] | Recent precise measurements of sin 2 beta from the B-factories (BABAR and BELLE) and a better known strange quark mass from lattice QCD make precision tests of predictive texture models possible. The models tested include those hierarchical N-zero textures classified by Ramond, Roberts and Ross, as well as any other hierarchical matrix Ansatz with non-zero 12 = 21 and vanishing 11 and 13 elements. We calculate the maximally allowed value for sin 2 beta in these models and show that all the aforementioned models with vanishing 11 and 13 elements are ruled out at the 3 sigma level. While at present sin 2 beta and |Vub/Vcb| are equally good for testing N-zero texture models, in the near future the former will surpass the latter in constraining power. |
1401.2162 | Muhammad Jamil Aslam | Ishtiaq Ahmed, M. Jamil Aslam and M. Ali Paracha | Effects of neutral $Z^{\prime}$ boson in $B_{s} \to \phi \ell^{+}
\ell^{-}$ decay with polarized $\phi$ and the unpolarized and polarized $CP$
violation asymmetry | 19 pages, 12 figures, A version close to the one accepted for
publication in Physics Review D. Reference 59 is updated | Phys. Rev. D 89 (2014) 015006 | 10.1103/PhysRevD.89.015006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of new neutral $Z^\prime$ boson in
$B_{s}\to\phi\ell^{+}\ell^{-}$, when $\phi$ is longitudinal or transverse
polarized, are studied. In addition, the implications of $Z^{\prime}$ boson on
the unpolarized and polarized $CP$ violation asymmetries, with reference to
lepton, are also presented. It is observed that the branching ratio with
polarized $\phi$ are quite sensitive to the $Z^{\prime}$ contributions which
are coming through the modification of Wilson coefficients $C^{eff}_{9}$ and
$C_{10}$. Moreover, the off-diagonal elements of the chiral $Z^{\prime}$
couplings contain new weak phase $\phi_{sb}$ that provide a new source of $CP$
violation. Keeping in view that in the FCNC transitions the $CP$ violation
asymmetries are highly suppressed in the SM, we have studied the unpolarized
and polarized $CP$ violation asymmetries in $B_{s}\to\phi\ell^{+}\ell^{-}$
decays. Our results indicate that these $CP$ violation asymmetries are
remarkably significant and can attribute the any new physics coming through the
$Z^{\prime}$ boson. It is hoped that the accurate measurements of these
asymmetries will not only help us to establish NP but will also give a chance
to determine the precise values of the coupling parameters of the $Z^{\prime}$
boson.
| [
{
"created": "Sat, 4 Jan 2014 16:47:01 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jun 2014 17:39:10 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Ahmed",
"Ishtiaq",
""
],
[
"Aslam",
"M. Jamil",
""
],
[
"Paracha",
"M. Ali",
""
]
] | The effects of new neutral $Z^\prime$ boson in $B_{s}\to\phi\ell^{+}\ell^{-}$, when $\phi$ is longitudinal or transverse polarized, are studied. In addition, the implications of $Z^{\prime}$ boson on the unpolarized and polarized $CP$ violation asymmetries, with reference to lepton, are also presented. It is observed that the branching ratio with polarized $\phi$ are quite sensitive to the $Z^{\prime}$ contributions which are coming through the modification of Wilson coefficients $C^{eff}_{9}$ and $C_{10}$. Moreover, the off-diagonal elements of the chiral $Z^{\prime}$ couplings contain new weak phase $\phi_{sb}$ that provide a new source of $CP$ violation. Keeping in view that in the FCNC transitions the $CP$ violation asymmetries are highly suppressed in the SM, we have studied the unpolarized and polarized $CP$ violation asymmetries in $B_{s}\to\phi\ell^{+}\ell^{-}$ decays. Our results indicate that these $CP$ violation asymmetries are remarkably significant and can attribute the any new physics coming through the $Z^{\prime}$ boson. It is hoped that the accurate measurements of these asymmetries will not only help us to establish NP but will also give a chance to determine the precise values of the coupling parameters of the $Z^{\prime}$ boson. |
hep-ph/0212048 | Fernando Marchesano | D. Cremades, L.E. Ibanez and F. Marchesano | More about the Standard Model at Intersecting Branes | 10 pages, Latex file, 7 figures. Contribution to the proceedings of
SUSY-02, Hamburg | null | null | FTUAM-02/29 IFT-UAM/CSIC-02-48 | hep-ph hep-th | null | Intersecting D-brane models seem to be one of the most promising avenues to
embed the Standard Model physics within the string context. We review here
different aspects of these models. Topics include the question of SUSY and
quasi-SUSY in intersecting brane models, model-building, the brane
recombination interpretation of the SM Higgs mechanism, Yukawa couplings, the
lowering of the string scale and possible new Z's accessible to accelerators.
| [
{
"created": "Tue, 3 Dec 2002 15:21:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cremades",
"D.",
""
],
[
"Ibanez",
"L. E.",
""
],
[
"Marchesano",
"F.",
""
]
] | Intersecting D-brane models seem to be one of the most promising avenues to embed the Standard Model physics within the string context. We review here different aspects of these models. Topics include the question of SUSY and quasi-SUSY in intersecting brane models, model-building, the brane recombination interpretation of the SM Higgs mechanism, Yukawa couplings, the lowering of the string scale and possible new Z's accessible to accelerators. |
hep-ph/9706242 | Ray Volkas | R. Foot and R. R. Volkas | How neutrino oscillations can induce an effective neutrino number of
less than 3 during Big Bang Nucleosynthesis | 22 pages, LaTeX, 2 figures | Phys.Rev.D56:6653-6664,1997; Erratum-ibid.D59:029901,1999 | 10.1103/PhysRevD.56.6653 10.1103/PhysRevD.59.029901 | UM-P-97/31 | hep-ph astro-ph | null | Ordinary-sterile neutrino oscillations can generate significant neutrino
asymmetry in the early Universe. In this paper we extend this work by computing
the evolution of neutrino asymmetries and light element abundances during the
Big Bang Nucleosynthesis (BBN) epoch. We show that a significant
electron-neutrino asymmetry can be generated in a way that is approximately
independent of the oscillation parameters $\delta m^2$ and $\sin^2 2\theta$ for
a range of parameters in an interesting class of models. The numerical value of
the asymmetry leads to the prediction that the effective number of neutrino
flavours during BBN is either about 2.5 or 3.4 depending on the sign of the
asymmetry. Interestingly, one class of primordial deuterium abundance data
favours an effective number of neutrino flavours during the epoch of BBN of
less than 3.
| [
{
"created": "Wed, 4 Jun 1997 06:33:23 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Foot",
"R.",
""
],
[
"Volkas",
"R. R.",
""
]
] | Ordinary-sterile neutrino oscillations can generate significant neutrino asymmetry in the early Universe. In this paper we extend this work by computing the evolution of neutrino asymmetries and light element abundances during the Big Bang Nucleosynthesis (BBN) epoch. We show that a significant electron-neutrino asymmetry can be generated in a way that is approximately independent of the oscillation parameters $\delta m^2$ and $\sin^2 2\theta$ for a range of parameters in an interesting class of models. The numerical value of the asymmetry leads to the prediction that the effective number of neutrino flavours during BBN is either about 2.5 or 3.4 depending on the sign of the asymmetry. Interestingly, one class of primordial deuterium abundance data favours an effective number of neutrino flavours during the epoch of BBN of less than 3. |
hep-ph/0501033 | Per Osland | B. K. Gjelsten, D. J. Miller, P. Osland | Measurement of the Gluino Mass via Cascade Decays for SPS 1a | 40 pages; extended discussion of errors | JHEP 0506:015,2005 | 10.1088/1126-6708/2005/06/015 | null | hep-ph hep-ex | null | If R-parity conserving supersymmetry is realised with masses below the TeV
scale, sparticles will be produced and decay in cascades at the LHC. In the
case of a neutral LSP, which will not be detected, decay chains cannot be fully
reconstructed, complicating the mass determination of the new particles. In
this paper we extend the method of obtaining masses from kinematical endpoints
to include a gluino at the head of a five-sparticle decay chain. This
represents a non-trivial extension of the corresponding method for the squark
decay chain. We calculate the endpoints of the new distributions and assess
their applicability by examining the theoretical distributions for a variety of
mass scenarios. The precision with which the gluino mass can be determined by
this method is investigated for the mSUGRA point SPS 1a. Finally we estimate
the improvement obtained from adding a Linear Collider measurement of the LSP
mass.
| [
{
"created": "Thu, 6 Jan 2005 12:47:53 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2005 13:10:15 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Gjelsten",
"B. K.",
""
],
[
"Miller",
"D. J.",
""
],
[
"Osland",
"P.",
""
]
] | If R-parity conserving supersymmetry is realised with masses below the TeV scale, sparticles will be produced and decay in cascades at the LHC. In the case of a neutral LSP, which will not be detected, decay chains cannot be fully reconstructed, complicating the mass determination of the new particles. In this paper we extend the method of obtaining masses from kinematical endpoints to include a gluino at the head of a five-sparticle decay chain. This represents a non-trivial extension of the corresponding method for the squark decay chain. We calculate the endpoints of the new distributions and assess their applicability by examining the theoretical distributions for a variety of mass scenarios. The precision with which the gluino mass can be determined by this method is investigated for the mSUGRA point SPS 1a. Finally we estimate the improvement obtained from adding a Linear Collider measurement of the LSP mass. |
1507.01570 | Maria Vittoria Garzelli | M.V. Garzelli, S. Moch, G. Sigl | Lepton fluxes from atmospheric charm revisited | 40 pages, 24 figures | JHEP 1510 (2015) 115 | 10.1007/JHEP10(2015)115 | DESY 15-107, MITP/15-049 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update predictions for lepton fluxes from the hadroproduction of charm
quarks in the scattering of primary cosmic rays with the Earth's atmosphere.
The calculation of charm-pair hadroproduction applies the latest results from
perturbative QCD through next-to-next-to-leading order and modern parton
distributions, together with estimates on various sources of uncertainties. Our
predictions for the lepton fluxes turn out to be compatible, within the
uncertainty band, with recent results in the literature. However, by taking
into account contributions neglected in previous works, our total uncertainties
are much larger. The predictions are crucial for the interpretation of results
from neutrino experiments like IceCube, when disentangling signals of neutrinos
of astrophysical origin from the atmospheric background.
| [
{
"created": "Mon, 6 Jul 2015 19:29:12 GMT",
"version": "v1"
}
] | 2016-01-01 | [
[
"Garzelli",
"M. V.",
""
],
[
"Moch",
"S.",
""
],
[
"Sigl",
"G.",
""
]
] | We update predictions for lepton fluxes from the hadroproduction of charm quarks in the scattering of primary cosmic rays with the Earth's atmosphere. The calculation of charm-pair hadroproduction applies the latest results from perturbative QCD through next-to-next-to-leading order and modern parton distributions, together with estimates on various sources of uncertainties. Our predictions for the lepton fluxes turn out to be compatible, within the uncertainty band, with recent results in the literature. However, by taking into account contributions neglected in previous works, our total uncertainties are much larger. The predictions are crucial for the interpretation of results from neutrino experiments like IceCube, when disentangling signals of neutrinos of astrophysical origin from the atmospheric background. |
hep-ph/9610252 | Ann E. Nelson | Andrew G. Cohen, David B. Kaplan, Francois Lepeintre and Ann E. Nelson | B-factory Physics from Effective Supersymmetry | 5 pages, 2 figures, revtex, epsf | Phys.Rev.Lett. 78 (1997) 2300-2303 | 10.1103/PhysRevLett.78.2300 | UW/PT-96/22, DOE/ER/40561290-INT96-148, BUHEP-96-38 | hep-ph hep-ex | null | We discuss how to extract non-Standard Model effects from B-factory
phenomenology. We then analyze the prospects for uncovering evidence for
Effective Supersymmetry, a class of supersymmetric models which naturally
suppress flavor changing neutral currents and electric dipole moments without
squark universality or small CP violating phases, in experiments at BaBar,
BELLE, HERA-B, CDF/D0 and LHC-B.
| [
{
"created": "Sat, 5 Oct 1996 00:14:33 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Oct 1996 00:50:45 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Feb 1997 00:35:00 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Cohen",
"Andrew G.",
""
],
[
"Kaplan",
"David B.",
""
],
[
"Lepeintre",
"Francois",
""
],
[
"Nelson",
"Ann E.",
""
]
] | We discuss how to extract non-Standard Model effects from B-factory phenomenology. We then analyze the prospects for uncovering evidence for Effective Supersymmetry, a class of supersymmetric models which naturally suppress flavor changing neutral currents and electric dipole moments without squark universality or small CP violating phases, in experiments at BaBar, BELLE, HERA-B, CDF/D0 and LHC-B. |
1104.3496 | Jos\'e Francisco Zurita | Ezequiel Alvarez, Estefania Coluccio Leskow and Jos\'e Zurita | Collider Bounds on Lee-Wick Higgs Bosons | 26 pages, 5 figures, matches version published by PRD | Phys.Rev.D83:115024,2011 | 10.1103/PhysRevD.83.115024 | ZU-TH 06/11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints on the Lee-Wick Higgs sector arising from direct
collider searches. We work in an effective-field theory framework, where all of
the Lee-Wick partners are integrated out, with the sole exception of the
Lee-Wick Higgs bosons. The resulting theory is a two-Higgs doublet model where
the second doublet has wrong-sign kinetic and mass terms. We include the bounds
coming from direct Higgs searches at both LEP and Tevatron using the code
HiggsBounds, and show the currently excluded parameter space. We also analyze
the prospects of LHC Run-I, finding that with a total integrated luminosity of
5 fb $^{-1}$ and a center-of-mass energy of 7 TeV, most of the parameter space
for the SM-like CP-even Higgs will be probed.
| [
{
"created": "Mon, 18 Apr 2011 14:32:28 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jul 2011 18:51:26 GMT",
"version": "v2"
}
] | 2011-07-26 | [
[
"Alvarez",
"Ezequiel",
""
],
[
"Leskow",
"Estefania Coluccio",
""
],
[
"Zurita",
"José",
""
]
] | We study the constraints on the Lee-Wick Higgs sector arising from direct collider searches. We work in an effective-field theory framework, where all of the Lee-Wick partners are integrated out, with the sole exception of the Lee-Wick Higgs bosons. The resulting theory is a two-Higgs doublet model where the second doublet has wrong-sign kinetic and mass terms. We include the bounds coming from direct Higgs searches at both LEP and Tevatron using the code HiggsBounds, and show the currently excluded parameter space. We also analyze the prospects of LHC Run-I, finding that with a total integrated luminosity of 5 fb $^{-1}$ and a center-of-mass energy of 7 TeV, most of the parameter space for the SM-like CP-even Higgs will be probed. |
hep-ph/0105153 | Ngee-Pong Chang | Ngee-Pong Chang | Oscillations of Faster than Light Majorana Neutrinos: A Causal Field
Theory | 12 pages, no figures | Mod.Phys.Lett. A16 (2001) 2129-2142 | 10.1142/S021773230100562X | CCNY-HEP-01-11 | hep-ph hep-th | null | In this paper, we carry out the canonical quantization of the field theory of
an interacting tachyonic Majorana neutrino. We show how micro-causality is
preserved in the physical scattering matrix elements between the in and out
vacua.
The phenomenology of this radical proposal is nevertheless compatible with
normal timelike oscillations.
| [
{
"created": "Wed, 16 May 2001 02:44:22 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Chang",
"Ngee-Pong",
""
]
] | In this paper, we carry out the canonical quantization of the field theory of an interacting tachyonic Majorana neutrino. We show how micro-causality is preserved in the physical scattering matrix elements between the in and out vacua. The phenomenology of this radical proposal is nevertheless compatible with normal timelike oscillations. |
1803.11009 | Jo\~ao Tiago Neves Penedo | J. T. Penedo, S. T. Petcov, A. V. Titov | Neutrino Mixing and Leptonic CP Violation from $S_4$ and Generalised CP
Symmetries | Poster presented at NuPhys2017 (London, 20-22 December 2017). 4
pages, LaTeX, 2 pdf figures | null | null | NuPhys2017-Penedo | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of models of neutrino mixing with $S_4$ flavour symmetry
and generalised CP symmetry, broken to $Z_2$ and $Z_2 \times {\rm CP}$ residual
symmetries in the charged lepton and neutrino sectors, respectively. In this
scheme, and up to discrete ambiguities, the neutrino mixing matrix is
determined by two angles and one phase. We classify the phenomenologically
viable mixing patterns, deriving predictions for the Dirac and Majorana CPV
phases and for the effective Majorana mass in neutrinoless double beta decay.
| [
{
"created": "Thu, 29 Mar 2018 11:11:53 GMT",
"version": "v1"
}
] | 2018-03-30 | [
[
"Penedo",
"J. T.",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Titov",
"A. V.",
""
]
] | We consider a class of models of neutrino mixing with $S_4$ flavour symmetry and generalised CP symmetry, broken to $Z_2$ and $Z_2 \times {\rm CP}$ residual symmetries in the charged lepton and neutrino sectors, respectively. In this scheme, and up to discrete ambiguities, the neutrino mixing matrix is determined by two angles and one phase. We classify the phenomenologically viable mixing patterns, deriving predictions for the Dirac and Majorana CPV phases and for the effective Majorana mass in neutrinoless double beta decay. |
hep-ph/0503007 | Zhi-Gang Wang | Zhi-Gang Wang (NCEPU), Shao-Long Wan (USTC), Wei-Min Yang (USTC) | Magnetic moment of the pentaquark $\Theta^+(1540)$ as
diquark-diquark-antiquark state with QCD sum rules | 17 pages, 4 figures, unifing hep-ph/0503007 with hep-ph/0503073 into
one article, input parameters changed slightly, add more discussions | Eur.Phys.J.C45:201-209,2006 | 10.1140/epjc/s2005-02400-1 | null | hep-ph | null | In this article, we study the magnetic moment of the pentaquark state $
\Theta^+(1540)$ as diquark-diquark-antiquark ($[ud][ud]\bar{s}$) state with the
QCD sum rules in the external weak electromagnetic field (EFSR) and the
light-cone QCD sum rules (LCSR) respectively. The numerical results indicate
the magnetic moment is about $\mu_{\Theta^+}=-(0.11\pm 0.02)\mu_N$ for the EFSR
and $\mu_{\Theta^+}\approx-(0.1-0.5)\mu_N$ for the LCSR. As the values obtained
from the EFSR are more stable than the corresponding ones from the LCSR,
$\mu_{\Theta^+}=-(0.11\pm 0.02)\mu_N$ is more reliable.
| [
{
"created": "Tue, 1 Mar 2005 12:25:43 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Mar 2005 02:53:40 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jun 2005 13:06:57 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Jun 2005 07:57:41 GMT",
"version": "v4"
}
] | 2009-01-07 | [
[
"Wang",
"Zhi-Gang",
"",
"NCEPU"
],
[
"Wan",
"Shao-Long",
"",
"USTC"
],
[
"Yang",
"Wei-Min",
"",
"USTC"
]
] | In this article, we study the magnetic moment of the pentaquark state $ \Theta^+(1540)$ as diquark-diquark-antiquark ($[ud][ud]\bar{s}$) state with the QCD sum rules in the external weak electromagnetic field (EFSR) and the light-cone QCD sum rules (LCSR) respectively. The numerical results indicate the magnetic moment is about $\mu_{\Theta^+}=-(0.11\pm 0.02)\mu_N$ for the EFSR and $\mu_{\Theta^+}\approx-(0.1-0.5)\mu_N$ for the LCSR. As the values obtained from the EFSR are more stable than the corresponding ones from the LCSR, $\mu_{\Theta^+}=-(0.11\pm 0.02)\mu_N$ is more reliable. |
1202.3431 | Joachim Kopp | Carlos A. Arguelles (Pontificia Universidad Catolica del Peru and
Fermilab) and Joachim Kopp (Fermilab) | Sterile neutrinos and indirect dark matter searches in IceCube | 13 pages, 5 figures; v2: minor corrections and improvements to
numerical results, added section about dependence of IceCube limits on
sterile neutrino parameters; v3: minor clarifications and additional
references, matches published version | JCAP 07 (2012) 016 | 10.1088/1475-7516/2012/07/016 | FERMILAB-PUB-12-038-T | hep-ph astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If light sterile neutrinos exist and mix with the active neutrino flavors,
this mixing will affect the propagation of high-energy neutrinos from dark
matter annihilation in the Sun. In particular, new Mikheyev-Smirnov-Wolfenstein
resonances can occur, leading to almost complete conversion of some active
neutrino flavors into sterile states. We demonstrate how this can weaken
IceCube limits on neutrino capture and annihilation in the Sun and how
potential future conflicts between IceCube constraints and direct detection or
collider data might be resolved by invoking sterile neutrinos. We also point
out that, if the dark matter--nucleon scattering cross section and the allowed
annihilation channels are precisely measured in direct detection and collider
experiments in the future, IceCube can be used to constrain sterile neutrino
models using neutrinos from the dark matter annihilation.
| [
{
"created": "Wed, 15 Feb 2012 20:55:06 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2012 16:52:24 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Jul 2012 13:34:19 GMT",
"version": "v3"
}
] | 2012-07-13 | [
[
"Arguelles",
"Carlos A.",
"",
"Pontificia Universidad Catolica del Peru and\n Fermilab"
],
[
"Kopp",
"Joachim",
"",
"Fermilab"
]
] | If light sterile neutrinos exist and mix with the active neutrino flavors, this mixing will affect the propagation of high-energy neutrinos from dark matter annihilation in the Sun. In particular, new Mikheyev-Smirnov-Wolfenstein resonances can occur, leading to almost complete conversion of some active neutrino flavors into sterile states. We demonstrate how this can weaken IceCube limits on neutrino capture and annihilation in the Sun and how potential future conflicts between IceCube constraints and direct detection or collider data might be resolved by invoking sterile neutrinos. We also point out that, if the dark matter--nucleon scattering cross section and the allowed annihilation channels are precisely measured in direct detection and collider experiments in the future, IceCube can be used to constrain sterile neutrino models using neutrinos from the dark matter annihilation. |
1603.06130 | Lukas Mitzka | Lukas Mitzka and Werner Porod | Reinterpretation of ATLAS 8 TeV searches for Natural SUSY with a
$R$-Sneutrino LSP | 27 pages, 9 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The data obtained by the LHC collaborations clearly show that supersymmetric
models are not realized in nature in a vanilla form and that in particular
strongly interacting supersymmetric particles are most likely heavier than
expected. An exception are the partners of the third generation quarks, which
also play a dominant role in the breaking of the electroweak symmetry. We
consider here an extended class of so-called `natural supersymmetric models'
where we allow for a sneutrino as the lightest supersymmetric particle as it
appears for example in left-right symmetric models and/or models where
supersymmetry is explained via an inverse seesaw mechanism. We evaluate how
much existing ATLAS data constrain such scenarios and obtain roughly a bound of
300 GeV on the charginos if the sneutrinos are lighter than about 120 GeV. For
the stop we find that only masses up to 300 GeV are excluded independent of the
mixing angle. For larger values the exclusion depends on the detail of the
scenario and if the mass exceeds 800 GeV no bound is obtained.
| [
{
"created": "Sat, 19 Mar 2016 18:54:34 GMT",
"version": "v1"
}
] | 2016-03-22 | [
[
"Mitzka",
"Lukas",
""
],
[
"Porod",
"Werner",
""
]
] | The data obtained by the LHC collaborations clearly show that supersymmetric models are not realized in nature in a vanilla form and that in particular strongly interacting supersymmetric particles are most likely heavier than expected. An exception are the partners of the third generation quarks, which also play a dominant role in the breaking of the electroweak symmetry. We consider here an extended class of so-called `natural supersymmetric models' where we allow for a sneutrino as the lightest supersymmetric particle as it appears for example in left-right symmetric models and/or models where supersymmetry is explained via an inverse seesaw mechanism. We evaluate how much existing ATLAS data constrain such scenarios and obtain roughly a bound of 300 GeV on the charginos if the sneutrinos are lighter than about 120 GeV. For the stop we find that only masses up to 300 GeV are excluded independent of the mixing angle. For larger values the exclusion depends on the detail of the scenario and if the mass exceeds 800 GeV no bound is obtained. |
0806.4799 | Yuji Sakai | Yuji Sakai, Kouji Kashiwa, Hiroaki Kouno, Masayuki Matsuzaki, and
Masanobu Yahiro | Vector-type four-quark interaction and its impact on QCD phase structure | 8 pages, 11 figures | Phys.Rev.D78:076007,2008 | 10.1103/PhysRevD.78.076007 | SAGA-HE-244-08 | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effects of the vector-type four-quark interaction on QCD phase structure are
investigated in the imaginary chemical potential region, by using the
Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model with the extended Z3
symmetry. In the course to this end, we clarify analytically the Roberge-Weiss
periodicity and symmetry properties of various quantities under the existence
of a vector-type four-quark interaction. In the imaginary chemical potential
region, the chiral condensate and the quark number density are sensitive to the
strength of the interaction. Based on this result, we propose a possibility to
determine the strength of the vector-type interaction, which largely affects
QCD phase structure in the real chemical potential region, by comparing the
results of lattice simulations and effective model calculations in the
imaginary chemical potential region.
| [
{
"created": "Mon, 30 Jun 2008 04:27:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sakai",
"Yuji",
""
],
[
"Kashiwa",
"Kouji",
""
],
[
"Kouno",
"Hiroaki",
""
],
[
"Matsuzaki",
"Masayuki",
""
],
[
"Yahiro",
"Masanobu",
""
]
] | Effects of the vector-type four-quark interaction on QCD phase structure are investigated in the imaginary chemical potential region, by using the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model with the extended Z3 symmetry. In the course to this end, we clarify analytically the Roberge-Weiss periodicity and symmetry properties of various quantities under the existence of a vector-type four-quark interaction. In the imaginary chemical potential region, the chiral condensate and the quark number density are sensitive to the strength of the interaction. Based on this result, we propose a possibility to determine the strength of the vector-type interaction, which largely affects QCD phase structure in the real chemical potential region, by comparing the results of lattice simulations and effective model calculations in the imaginary chemical potential region. |
1311.0040 | Jakub Scholtz | Ann E. Nelson and Jakub Scholtz | Heavy Flavor & Dark Sector | 27 pages, 10 figures | Phys. Rev. D 91, 014009 (2015) | 10.1103/PhysRevD.91.014009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider some contributions to rare processes in $B$ meson decays from a
Dark Sector containing 2 light unstable scalars, with large couplings to each
other and small mixings with Standard Model Higgs scalars. We show that
existing constraints allow for an exotic contribution to high multiplicity
final states with a branching fraction as large as $\mathcal{O}(10^{-4})$, and
that exotic particles could appear as narrow resonances or long lived particles
which are mainly found in high multiplicity final states from $B$ decays.
| [
{
"created": "Thu, 31 Oct 2013 21:25:49 GMT",
"version": "v1"
}
] | 2015-01-14 | [
[
"Nelson",
"Ann E.",
""
],
[
"Scholtz",
"Jakub",
""
]
] | We consider some contributions to rare processes in $B$ meson decays from a Dark Sector containing 2 light unstable scalars, with large couplings to each other and small mixings with Standard Model Higgs scalars. We show that existing constraints allow for an exotic contribution to high multiplicity final states with a branching fraction as large as $\mathcal{O}(10^{-4})$, and that exotic particles could appear as narrow resonances or long lived particles which are mainly found in high multiplicity final states from $B$ decays. |
1307.3508 | Alan D. Martin | E.G. de Oliveira, A.D. Martin, M.G. Ryskin and A.G. Shuvaev | Treatment of heavy quarks in QCD | 14 pages, 3 figures, references updated, version to be published in
EPJC | null | 10.1140/epjc/s10052-013-2616-2 | IPPP/13/53, DCPT/13/106 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that to correctly describe the effects of the heavy-quark mass, m_h,
in DGLAP evolution, it is necessary to work in the so-called `physical' scheme.
In this way, we automatically obtain a smooth transition through the
heavy-quark thresholds. Moreover, we show that to obtain NLO accuracy, it is
sufficient to account for the heavy-quark mass, m_h, just in the LO (one-loop)
splitting function. The use of the MS-bar factorisation scheme is not
appropriate, since at NLO we deal with a mixture of quarks and gluon (that is,
the mass of the heavy parton is not well-defined). The formulae for the
explicit m_h dependence of the splitting functions, and for alpha_s, are
presented.
| [
{
"created": "Fri, 12 Jul 2013 16:39:15 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2013 09:55:01 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"de Oliveira",
"E. G.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Shuvaev",
"A. G.",
""
]
] | We show that to correctly describe the effects of the heavy-quark mass, m_h, in DGLAP evolution, it is necessary to work in the so-called `physical' scheme. In this way, we automatically obtain a smooth transition through the heavy-quark thresholds. Moreover, we show that to obtain NLO accuracy, it is sufficient to account for the heavy-quark mass, m_h, just in the LO (one-loop) splitting function. The use of the MS-bar factorisation scheme is not appropriate, since at NLO we deal with a mixture of quarks and gluon (that is, the mass of the heavy parton is not well-defined). The formulae for the explicit m_h dependence of the splitting functions, and for alpha_s, are presented. |
2405.12943 | Yi Chen | Yi Chen, Yang Li, C\'edric Lorc\'e, Qun Wang | The nucleon axial radius | 6 pages, 3 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a systematic study of the relativistic axial-vector four-current
distributions inside a nucleon. We show in particular that the slope of the
axial form factor $G_A(Q^2)$ in the forward limit -- conventionally denoted as
$R^2_A$ in the literature -- does not represent the three-dimensional
mean-square axial radius in the Breit frame, but corresponds instead to a
contribution to the mean-square spin radius. We derive explicit expressions for
the latter in different frames and find in general additional contributions
that depend on both the nucleon mass and the forward values of the axial-vector
form factors $G_A(0)$ and $G_P(0)$.
| [
{
"created": "Tue, 21 May 2024 17:16:19 GMT",
"version": "v1"
}
] | 2024-05-22 | [
[
"Chen",
"Yi",
""
],
[
"Li",
"Yang",
""
],
[
"Lorcé",
"Cédric",
""
],
[
"Wang",
"Qun",
""
]
] | We present a systematic study of the relativistic axial-vector four-current distributions inside a nucleon. We show in particular that the slope of the axial form factor $G_A(Q^2)$ in the forward limit -- conventionally denoted as $R^2_A$ in the literature -- does not represent the three-dimensional mean-square axial radius in the Breit frame, but corresponds instead to a contribution to the mean-square spin radius. We derive explicit expressions for the latter in different frames and find in general additional contributions that depend on both the nucleon mass and the forward values of the axial-vector form factors $G_A(0)$ and $G_P(0)$. |
1707.07266 | Kazuhiro Watanabe | Yan-Qing Ma, Raju Venugopalan, Kazuhiro Watanabe, Hong-Fei Zhang | $\psi(2S)$ versus $J/\psi$ suppression in proton-nucleus collisions from
factorization violating soft color exchanges | 16 pages, 12 figures. v2: version accepted for publication in PRC | Phys. Rev. C 97, 014909 (2018) | 10.1103/PhysRevC.97.014909 | JLAB-THY-17-2528 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the large suppression of the $\psi(2S)$ inclusive cross-section
relative to the $J/\psi$ inclusive cross-section in proton-nucleus (p+A)
collisions can be attributed to factorization breaking effects in the formation
of quarkonium. These factorization breaking effects arise from soft color
exchanges between charm-anticharm pairs undergoing hadronization and comoving
partons that are long-lived on time scales of quarkonium formation. We compute
the short distance pair production of heavy quarks in the Color Glass
Condensate (CGC) effective field theory and employ an improved Color
Evaporation model (ICEM) to describe their hadronization into quarkonium at
large distances. The combined CGC+ICEM model provides a quantitative
description of $J/\psi$ and $\psi(2S)$ data in proton-proton (p+p) collisions
from both RHIC and the LHC. Factorization breaking effects in hadronization,
due to additional parton comovers in the nucleus, are introduced heuristically
by imposing a cutoff $\Lambda$, representing the momentum kick from soft color
exchanges, in the ICEM model. Such soft exchanges have no perceptible effect on
$J/\psi$ suppression in p+A collisions. In contrast, the interplay of the
physics of these soft exchanges at large distances, with the physics of
semi-hard rescattering at short distances, causes a significant additional
suppression of $\psi(2S)$ yields relative to that of the $J/\psi$. A good fit
of all RHIC and LHC $J/\psi$ and $\psi(2S)$ data, for transverse momenta
$P_\perp\leq 5$ GeV in p+p and p+A collisions, is obtained for $\Lambda\sim 10$
MeV.
| [
{
"created": "Sun, 23 Jul 2017 08:24:00 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 02:36:28 GMT",
"version": "v2"
}
] | 2018-02-02 | [
[
"Ma",
"Yan-Qing",
""
],
[
"Venugopalan",
"Raju",
""
],
[
"Watanabe",
"Kazuhiro",
""
],
[
"Zhang",
"Hong-Fei",
""
]
] | We argue that the large suppression of the $\psi(2S)$ inclusive cross-section relative to the $J/\psi$ inclusive cross-section in proton-nucleus (p+A) collisions can be attributed to factorization breaking effects in the formation of quarkonium. These factorization breaking effects arise from soft color exchanges between charm-anticharm pairs undergoing hadronization and comoving partons that are long-lived on time scales of quarkonium formation. We compute the short distance pair production of heavy quarks in the Color Glass Condensate (CGC) effective field theory and employ an improved Color Evaporation model (ICEM) to describe their hadronization into quarkonium at large distances. The combined CGC+ICEM model provides a quantitative description of $J/\psi$ and $\psi(2S)$ data in proton-proton (p+p) collisions from both RHIC and the LHC. Factorization breaking effects in hadronization, due to additional parton comovers in the nucleus, are introduced heuristically by imposing a cutoff $\Lambda$, representing the momentum kick from soft color exchanges, in the ICEM model. Such soft exchanges have no perceptible effect on $J/\psi$ suppression in p+A collisions. In contrast, the interplay of the physics of these soft exchanges at large distances, with the physics of semi-hard rescattering at short distances, causes a significant additional suppression of $\psi(2S)$ yields relative to that of the $J/\psi$. A good fit of all RHIC and LHC $J/\psi$ and $\psi(2S)$ data, for transverse momenta $P_\perp\leq 5$ GeV in p+p and p+A collisions, is obtained for $\Lambda\sim 10$ MeV. |
hep-ph/9412249 | Arnd Leike | K. Ko{\l}odziej, A. Leike, R. R\"uckl | Production Mechanisms for $B_c$ Mesons in Photon--Photon Collisions | 10 pages Latex, 6 postscript figures (included by epsf) | Phys.Lett.B348:219-225,1995 | 10.1016/0370-2693(95)00121-Z | MPI-PhT/94-84, LMU-23/94 | hep-ph | null | Using photon-photon collisions as a particularly transparent study case we
investigate the production mechanisms for $B_c$ mesons. In nonrelativistic
approximation and to $O(\alpha^2\alpha_s^2)$ it is shown that recombination of
$\bar{b}$- and $c$-quarks dominates by far over $\bar{b}$ and $c$
fragmentation. This dominance persists up to the highest accessible transverse
momenta and leads to distributions in energy which differ completely from the
spectra expected on the basis of the fragmentation functions. For processes in
which a $b \bar{b}$-pair is radiated from a primary $c$-quark, the
fragmentation description is found to be inadequate. We anticipate important
implications of these results for hadronic production of heavy quark
resonances. Using realistic photon spectra we predict two-photon production
rates for $B_c$ and $B_c^*$ at present and future $e^+e^-$-machines.
| [
{
"created": "Tue, 6 Dec 1994 16:56:19 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Kołodziej",
"K.",
""
],
[
"Leike",
"A.",
""
],
[
"Rückl",
"R.",
""
]
] | Using photon-photon collisions as a particularly transparent study case we investigate the production mechanisms for $B_c$ mesons. In nonrelativistic approximation and to $O(\alpha^2\alpha_s^2)$ it is shown that recombination of $\bar{b}$- and $c$-quarks dominates by far over $\bar{b}$ and $c$ fragmentation. This dominance persists up to the highest accessible transverse momenta and leads to distributions in energy which differ completely from the spectra expected on the basis of the fragmentation functions. For processes in which a $b \bar{b}$-pair is radiated from a primary $c$-quark, the fragmentation description is found to be inadequate. We anticipate important implications of these results for hadronic production of heavy quark resonances. Using realistic photon spectra we predict two-photon production rates for $B_c$ and $B_c^*$ at present and future $e^+e^-$-machines. |
1908.00207 | Masaki Yamada | Ayuki Kamada, Masaki Yamada, Tsutomu T. Yanagida | Unification for the Darkly Charged Dark Matter | 6 pages, 2 figures | Phys. Rev. D 102, 015012 (2020) | 10.1103/PhysRevD.102.015012 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a simple UV theory for a Dirac dark matter with a massless Abelian
gauge boson. We introduce a single fermion transforming as the $\bf{16}$
representation in the SO(10)$'$ gauge group, which is assumed to be
spontaneously broken to SU(5)$'\times$U(1)$'$. The SU(5)$'$ gauge interaction
becomes strong at an intermediate scale and then we obtain a light composite
Dirac fermion with U(1)$'$ gauge interaction at the low-energy scale. Its
thermal relic can explain the observed amount of dark matter consistently with
other cosmological and astrophysical constraints. We discuss that a nonzero
kinetic mixing between the U(1)$'$ gauge boson and the Hypercharge gauge boson
is allowed and the temperature of the visible sector and the dark matter sector
can be equal to each other.
| [
{
"created": "Thu, 1 Aug 2019 04:54:50 GMT",
"version": "v1"
}
] | 2020-07-22 | [
[
"Kamada",
"Ayuki",
""
],
[
"Yamada",
"Masaki",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We provide a simple UV theory for a Dirac dark matter with a massless Abelian gauge boson. We introduce a single fermion transforming as the $\bf{16}$ representation in the SO(10)$'$ gauge group, which is assumed to be spontaneously broken to SU(5)$'\times$U(1)$'$. The SU(5)$'$ gauge interaction becomes strong at an intermediate scale and then we obtain a light composite Dirac fermion with U(1)$'$ gauge interaction at the low-energy scale. Its thermal relic can explain the observed amount of dark matter consistently with other cosmological and astrophysical constraints. We discuss that a nonzero kinetic mixing between the U(1)$'$ gauge boson and the Hypercharge gauge boson is allowed and the temperature of the visible sector and the dark matter sector can be equal to each other. |
2009.12067 | Kouji Kashiwa | Kouji Kashiwa, Hiroaki Kouno | Information theoretical view of QCD effective model with heavy quarks | 8 pages, 3 figures | Phys. Rev. D 103, 014014 (2021) | 10.1103/PhysRevD.103.014014 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To understand the phase transition phenomena, information theoretical
approaches can pick up some important properties of the phenomena based on the
probability distribution. In this paper, we show information theoretical
aspects of the 3-dimensional 3-state Potts model with the external field which
is corresponding to the QCD effective model with heavy quarks. The transfer
mutual information which represents the information flow of two spin variables
is numerically estimated based on the Markov-chain Monte-Carlo method. The
transfer mutual information has the peak near the confinement-deconfinement
transition, and it may be used to detect the precursors of the transition.
Since the transfer mutual information still have the peak even if the
Polyakov-loop changes continuously and smoothly, we may pick up some aspects of
the confinement-deconfinement nature from the information flow properties.
Particularly, the transfer mutual information shows the significantly different
behavior below and above the Roberge-Weiss endpoint existed in the pure
imaginary chemical potential region, which may indicate the system change by
the confinement-deconfinement transition.
| [
{
"created": "Fri, 25 Sep 2020 07:34:20 GMT",
"version": "v1"
}
] | 2021-01-20 | [
[
"Kashiwa",
"Kouji",
""
],
[
"Kouno",
"Hiroaki",
""
]
] | To understand the phase transition phenomena, information theoretical approaches can pick up some important properties of the phenomena based on the probability distribution. In this paper, we show information theoretical aspects of the 3-dimensional 3-state Potts model with the external field which is corresponding to the QCD effective model with heavy quarks. The transfer mutual information which represents the information flow of two spin variables is numerically estimated based on the Markov-chain Monte-Carlo method. The transfer mutual information has the peak near the confinement-deconfinement transition, and it may be used to detect the precursors of the transition. Since the transfer mutual information still have the peak even if the Polyakov-loop changes continuously and smoothly, we may pick up some aspects of the confinement-deconfinement nature from the information flow properties. Particularly, the transfer mutual information shows the significantly different behavior below and above the Roberge-Weiss endpoint existed in the pure imaginary chemical potential region, which may indicate the system change by the confinement-deconfinement transition. |
2107.14775 | Berndt Muller | Berndt M\"uller | $\eta/s-\hat{q}/T^3$ Relation at Next-to-Leading Order in QCD | Slightly amended version submitted for journal publication | Phys. Rev. D 104, 071501 (2021) | 10.1103/PhysRevD.104.L071501 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The relation between the specific shear viscosity $\eta/s$ and the
dimensionless jet quenching parameter $\hat{q}/T^3$ in perturbative QCD is
explored at next-to-leading order in the coupling constant. It is shown that
the relation changes little, although both transport coefficients independently
are subject to large modifications at the NLO level. This finding confirms that
the relationship is robust.
| [
{
"created": "Fri, 30 Jul 2021 17:27:47 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Aug 2021 17:57:59 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Müller",
"Berndt",
""
]
] | The relation between the specific shear viscosity $\eta/s$ and the dimensionless jet quenching parameter $\hat{q}/T^3$ in perturbative QCD is explored at next-to-leading order in the coupling constant. It is shown that the relation changes little, although both transport coefficients independently are subject to large modifications at the NLO level. This finding confirms that the relationship is robust. |
1801.02670 | Antonio Morais | Thibault Vieu, Ant\'onio P. Morais and Roman Pasechnik | Electroweak phase transitions in multi-Higgs models: the case of
Trinification-inspired THDSM | 48 pages, 13 figures | null | 10.1088/1475-7516/2018/07/014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rich vacuum structure of multi-Higgs extensions of the Standard Model
(SM) may have interesting cosmological implications for the electroweak phase
transition (EWPT). As an important example of such class of models, we consider
a particularly simple low-energy SM-like limit of a recently proposed
Grand-Unified Trinification model with the scalar sector composed of two Higgs
doublets and a complex singlet and with a global $\mathrm{U}(1)$ family
symmetry. The fermion sector of this model is extended with a family of
vector-like quarks which enhances CP violation. With the current study, we aim
at exploring the generic vacuum structure and uncovering the features of the
EWPT in this model relevant for cosmology. We show the existence of different
phase transition patterns providing strong departure from thermal equilibrium.
Most of these observations are not specific to the considered model and may
generically be expected in other multi-Higgs extensions of the SM.
| [
{
"created": "Mon, 8 Jan 2018 20:10:27 GMT",
"version": "v1"
}
] | 2018-07-18 | [
[
"Vieu",
"Thibault",
""
],
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
]
] | The rich vacuum structure of multi-Higgs extensions of the Standard Model (SM) may have interesting cosmological implications for the electroweak phase transition (EWPT). As an important example of such class of models, we consider a particularly simple low-energy SM-like limit of a recently proposed Grand-Unified Trinification model with the scalar sector composed of two Higgs doublets and a complex singlet and with a global $\mathrm{U}(1)$ family symmetry. The fermion sector of this model is extended with a family of vector-like quarks which enhances CP violation. With the current study, we aim at exploring the generic vacuum structure and uncovering the features of the EWPT in this model relevant for cosmology. We show the existence of different phase transition patterns providing strong departure from thermal equilibrium. Most of these observations are not specific to the considered model and may generically be expected in other multi-Higgs extensions of the SM. |
hep-ph/0211235 | Osamu Kiriyama | O. Kiriyama and A. Hosaka | Chiral phase properties of finite size quark droplets in the
Nambu--Jona-Lasinio model | RevTex4, 9 pages, 6 figures, to be published in Phys. Rev. D | Phys.Rev. D67 (2003) 085010 | 10.1103/PhysRevD.67.085010 | RCNP-Th02019 | hep-ph astro-ph nucl-th | null | Chiral phase properties of finite size hadronic systems are investigated
within the Nambu--Jona-Lasinio model. Finite size effects are taken into
account by making use of the multiple reflection expansion. We find that, for
droplets with relatively small baryon numbers, chiral symmetry restoration is
enhanced by the finite size effects. However the radius of the stable droplet
does not change much, as compared to that without the multiple reflection
expansion.
| [
{
"created": "Fri, 15 Nov 2002 03:07:36 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Nov 2002 02:05:39 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Dec 2002 06:13:37 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Feb 2003 07:36:27 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Kiriyama",
"O.",
""
],
[
"Hosaka",
"A.",
""
]
] | Chiral phase properties of finite size hadronic systems are investigated within the Nambu--Jona-Lasinio model. Finite size effects are taken into account by making use of the multiple reflection expansion. We find that, for droplets with relatively small baryon numbers, chiral symmetry restoration is enhanced by the finite size effects. However the radius of the stable droplet does not change much, as compared to that without the multiple reflection expansion. |
hep-ph/9802206 | Xiaotong Song | Xiaotong Song | Orbital Angular Momentum in the Chiral Quark Model | 18 pages, 8 tables, revtex; typos corrected, numerical results
slightly changed in Eq.(18)-(20) and in Table IV, reference added | null | null | INPP-UVA-97-08, December, 1997 (Revised April 20, 1998) | hep-ph | null | We developed a new and unified scheme for describing both quark spin and
orbital angular momenta in symmetry-breaking chiral quark model. The loss of
quark spin in the chiral splitting processes is compensated by the gain of the
orbital angular momentum carried by quarks and antiquarks. The sum of both spin
and orbital angular momenta carried by quarks and antiquarks is 1/2. The
analytic and numerical results for the spin and orbital angular momenta carried
by quarks and antiquarks in the nucleon are given. Extension to other octet and
decuplet baryons is also presented. Possible modification and application are
discussed.
| [
{
"created": "Sat, 31 Jan 1998 22:49:22 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 1998 23:52:15 GMT",
"version": "v2"
},
{
"created": "Wed, 6 May 1998 00:18:48 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Song",
"Xiaotong",
""
]
] | We developed a new and unified scheme for describing both quark spin and orbital angular momenta in symmetry-breaking chiral quark model. The loss of quark spin in the chiral splitting processes is compensated by the gain of the orbital angular momentum carried by quarks and antiquarks. The sum of both spin and orbital angular momenta carried by quarks and antiquarks is 1/2. The analytic and numerical results for the spin and orbital angular momenta carried by quarks and antiquarks in the nucleon are given. Extension to other octet and decuplet baryons is also presented. Possible modification and application are discussed. |
0806.2301 | Andrea Ferroglia | R. Bonciani, A. Ferroglia, T. Gehrmann, D. Maitre, and C. Studerus | Two-Loop Fermionic Corrections to Heavy-Quark Pair Production: the
Quark-Antiquark Channel | 23 pages, 4 figures | JHEP 0807:129,2008 | 10.1088/1126-6708/2008/07/129 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the fermionic two-loop QCD corrections to the heavy-quark pair
production process in the quark-antiquark channel. We obtain analytic results
which are valid for any value of the Mandelstam invariants s and t, and of the
heavy quark mass m. Our findings confirm previous results for the analytic
evaluation in the small-mass limit and numerical results for the exact
amplitude. We furthermore provide the expansion of the two-loop amplitude at
the production threshold s ~ 4m^2.
| [
{
"created": "Fri, 13 Jun 2008 17:29:46 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Bonciani",
"R.",
""
],
[
"Ferroglia",
"A.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Maitre",
"D.",
""
],
[
"Studerus",
"C.",
""
]
] | We evaluate the fermionic two-loop QCD corrections to the heavy-quark pair production process in the quark-antiquark channel. We obtain analytic results which are valid for any value of the Mandelstam invariants s and t, and of the heavy quark mass m. Our findings confirm previous results for the analytic evaluation in the small-mass limit and numerical results for the exact amplitude. We furthermore provide the expansion of the two-loop amplitude at the production threshold s ~ 4m^2. |
hep-ph/0406326 | Patricia Ball | Patricia Ball | The Theory of CP-Violation -- in as Much of a Nutshell as Will Fit on 8
Pages | 8 pages, review talk given at Daphne 2004, Frascati June 2004 | null | null | null | hep-ph | null | Do you know that CP violation is intrinsically linked to the scalar sector of
the Standard Model and its extensions? If yes, you need read no further - if
no, you may turn over the titlepage and start reading now.
| [
{
"created": "Tue, 29 Jun 2004 16:10:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ball",
"Patricia",
""
]
] | Do you know that CP violation is intrinsically linked to the scalar sector of the Standard Model and its extensions? If yes, you need read no further - if no, you may turn over the titlepage and start reading now. |
2008.09276 | Ya-Peng Zhao | Ya-Peng Zhao, Shu-Yu Zuo, and Cheng-Ming Li | QCD phase diagram and critical exponents within the nonextensive
Polyakov-Nambu-Jona-Lasinio model | arXiv admin note: substantial text overlap with arXiv:2004.14556 | null | 10.1088/1674-1137/abf8a2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a nonextensive version of the Polyakov-Nambu-Jona-Lasinio model
which is based on the nonextentive statistical mechanics. This new statistics
is characterized by a dimensionless nonextensivity parameter $q$ that accounts
for all possible effects violating the assumptions of the Boltzmann-Gibbs (BG)
statistics (when $q\rightarrow1$, it returns to the BG case). Based on the
nonextensive Polyakov-Nambu-Jona-Lasinio model, we discussed the influence of
the nonextensive effects on the QCD phase transition, especially on the
location of the critical end point (CEP). A new and interesting phenomenon we
found is that with the increase of $q$, the CEP position initially shifted
toward the direction of larger chemical potential and lower temperature. But
then, when $q$ is greater than a critical value $q_{c}$, the CEP position moves
in the opposite direction. In other words, as $q$ increases, the CEP position
moves in the direction of smaller chemical potential and higher temperature. In
addition, we calculated the influence of the nonextensive effects on the
critical exponents and found that they remain almost constant with $q$.
| [
{
"created": "Fri, 21 Aug 2020 02:49:28 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Zhao",
"Ya-Peng",
""
],
[
"Zuo",
"Shu-Yu",
""
],
[
"Li",
"Cheng-Ming",
""
]
] | We present a nonextensive version of the Polyakov-Nambu-Jona-Lasinio model which is based on the nonextentive statistical mechanics. This new statistics is characterized by a dimensionless nonextensivity parameter $q$ that accounts for all possible effects violating the assumptions of the Boltzmann-Gibbs (BG) statistics (when $q\rightarrow1$, it returns to the BG case). Based on the nonextensive Polyakov-Nambu-Jona-Lasinio model, we discussed the influence of the nonextensive effects on the QCD phase transition, especially on the location of the critical end point (CEP). A new and interesting phenomenon we found is that with the increase of $q$, the CEP position initially shifted toward the direction of larger chemical potential and lower temperature. But then, when $q$ is greater than a critical value $q_{c}$, the CEP position moves in the opposite direction. In other words, as $q$ increases, the CEP position moves in the direction of smaller chemical potential and higher temperature. In addition, we calculated the influence of the nonextensive effects on the critical exponents and found that they remain almost constant with $q$. |
hep-ph/9607310 | null | Marion Flanz, Emmanuel A. Paschos, Utpal Sarkar and Jan Weiss | Baryogenesis Through Mixing of Heavy Majorana Neutrinos | 15 pages (including 4 eps files) | Phys.Lett. B389 (1996) 693-699 | 10.1016/S0370-2693(96)01337-8 | null | hep-ph | null | A mechanism is presented, in which the mixing of right handed heavy Majorana
neutrinos creates a $CP-$asymmetric universe. When these Majorana neutrinos
subsequently decay more leptons than anti-leptons are produced. The lepton
asymmetry created by this new mechanism can exceed by a few orders of magnitude
any lepton asymmetry originating from direct decays. The asymmetry is finally
converted into a baryon asymmetry during the electroweak phase transition.
| [
{
"created": "Mon, 15 Jul 1996 10:35:39 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Flanz",
"Marion",
""
],
[
"Paschos",
"Emmanuel A.",
""
],
[
"Sarkar",
"Utpal",
""
],
[
"Weiss",
"Jan",
""
]
] | A mechanism is presented, in which the mixing of right handed heavy Majorana neutrinos creates a $CP-$asymmetric universe. When these Majorana neutrinos subsequently decay more leptons than anti-leptons are produced. The lepton asymmetry created by this new mechanism can exceed by a few orders of magnitude any lepton asymmetry originating from direct decays. The asymmetry is finally converted into a baryon asymmetry during the electroweak phase transition. |
1403.5717 | Yu Gao | Rouzbeh Allahverdi, Bhaskar Dutta, Yu Gao | keV Photon Emission from Light Nonthermal Dark Matter | 3 pages, 1 figure | Phys. Rev. D 89, 127305 (2014) | 10.1103/PhysRevD.89.127305 | MIFPA-14-10 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a possible explanation for the recent claim of an excess at 3.5
keV in the X-ray spectrum within a minimal extension of the standard model that
explains dark matter and baryon abundance of the universe. The dark matter mass
in this model is ${\cal O}({\rm GeV})$ and its relic density has a non-thermal
origin. The model includes two colored scalars of ${\cal O}({\rm TeV})$ mass
($X_{1,2}$), and two singlet fermions that are almost degenerate in mass with
the proton ($N_{1,2}$). The heavier fermion $N_2$ undergoes radiative decay to
the lighter one $N_1$ that is absolutely stable. Radiative decay with a life
time $\sim 10^{23}$ seconds can account for the claimed 3.5 keV line, which
requires couplings $\sim 10^{-3}-10^{-1}$ between $X_{1,2}, ~ N_{1,2}$ and the
up-type quarks. The model also gives rise to potentially detectable monojet,
dijet, and monotop signals at the LHC.
| [
{
"created": "Sun, 23 Mar 2014 03:31:18 GMT",
"version": "v1"
}
] | 2014-07-09 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Gao",
"Yu",
""
]
] | We propose a possible explanation for the recent claim of an excess at 3.5 keV in the X-ray spectrum within a minimal extension of the standard model that explains dark matter and baryon abundance of the universe. The dark matter mass in this model is ${\cal O}({\rm GeV})$ and its relic density has a non-thermal origin. The model includes two colored scalars of ${\cal O}({\rm TeV})$ mass ($X_{1,2}$), and two singlet fermions that are almost degenerate in mass with the proton ($N_{1,2}$). The heavier fermion $N_2$ undergoes radiative decay to the lighter one $N_1$ that is absolutely stable. Radiative decay with a life time $\sim 10^{23}$ seconds can account for the claimed 3.5 keV line, which requires couplings $\sim 10^{-3}-10^{-1}$ between $X_{1,2}, ~ N_{1,2}$ and the up-type quarks. The model also gives rise to potentially detectable monojet, dijet, and monotop signals at the LHC. |
1310.1627 | Vladimir Kovalenko | Evgeniia Bodnia (1 and 2), Denis Derkach (3), Grigory Feofilov (2),
Vladimir Kovalenko (2), Andrey Puchkov (2) ((1) University of California,
Berkeley, USA, (2) Saint Petersburg State University, Russia, (3) Oxford
University, UK) | Multi-pomeron exchange model for $pp$ and $p\bar{p}$ collisions at
ultra-high energy | 7 pages, 7 figures, to appear in proc. QFTHEP'2013 | null | 10.22323/1.183.0060 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | A new variant of the effective pomeron exchange model is proposed for the
description of the correlation, observed in $pp$ and $p\bar{p}$ collisions at
center-of-mass energy from SPS to LHC, between mean transverse momentum and
charged particles multiplicity. The model is based on the Regge-Gribov
approach. Smooth logarithmic growth with the collision energy was established
for the parameter k, the mean rapidity density of charged particles produced by
a single string. It was obtained in the model by the fitting of the available
experimental data on charged particles rapidity density in $pp$ and $p\bar{p}$
collisions. The main effect of the model, a gradual onset of string
collectivity with the growth of collision energy, is accounted by a free
parameter {\beta} that is responsible in an effective way for the string fusion
phenomenon. Another free parameter, t, is used to define string tension. We
extract parameters {\beta} and t from the available experimental results on
<pt>-multiplicity correlation at nucleon collision energy $\sqrt{s}$ from 17
GeV to 7 TeV. Smooth dependence of both {\beta} and t on energy allows to make
predictions for the correlation behavior at the collision energy of 14 TeV. The
indications to the string interaction effects in high multiplicity events in
$pp$ collisions at the LHC energies are also discussed.
| [
{
"created": "Sun, 6 Oct 2013 20:45:53 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Bodnia",
"Evgeniia",
"",
"1 and 2"
],
[
"Derkach",
"Denis",
""
],
[
"Feofilov",
"Grigory",
""
],
[
"Kovalenko",
"Vladimir",
""
],
[
"Puchkov",
"Andrey",
""
]
] | A new variant of the effective pomeron exchange model is proposed for the description of the correlation, observed in $pp$ and $p\bar{p}$ collisions at center-of-mass energy from SPS to LHC, between mean transverse momentum and charged particles multiplicity. The model is based on the Regge-Gribov approach. Smooth logarithmic growth with the collision energy was established for the parameter k, the mean rapidity density of charged particles produced by a single string. It was obtained in the model by the fitting of the available experimental data on charged particles rapidity density in $pp$ and $p\bar{p}$ collisions. The main effect of the model, a gradual onset of string collectivity with the growth of collision energy, is accounted by a free parameter {\beta} that is responsible in an effective way for the string fusion phenomenon. Another free parameter, t, is used to define string tension. We extract parameters {\beta} and t from the available experimental results on <pt>-multiplicity correlation at nucleon collision energy $\sqrt{s}$ from 17 GeV to 7 TeV. Smooth dependence of both {\beta} and t on energy allows to make predictions for the correlation behavior at the collision energy of 14 TeV. The indications to the string interaction effects in high multiplicity events in $pp$ collisions at the LHC energies are also discussed. |
1111.1849 | Yuming Wang | Thomas Mannel and Yu-Ming Wang | Heavy-to-light baryonic form factors at large recoil | 19 pages | null | 10.1007/JHEP12(2011)067 | SI-HEP-2011-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze heavy-to-light baryonic form factors at large recoil and derive
the scaling behavior of these form factors in the heavy quark limit. It is
shown that only one universal form factor is needed to parameterize Lambda_b to
p and Lambda_b to Lambda matrix elements in the large recoil limit of light
baryons, while hadronic matrix elements of Lambda_b to Sigma transition vanish
in the large energy limit of Sigma baryon due to the space-time parity
symmetry. The scaling law of the soft form factor eta(P^{\prime} \cdot v),
P^{\prime} and v being the momentum of nucleon and the velocity of Lambda_b
baryon, responsible for Lambda_b to p transitions is also derived using the
nucleon distribution amplitudes in leading conformal spin. In particular, we
verify that this scaling behavior is in full agreement with that from
light-cone sum rule approach in the heavy-quark limit. With these form factors,
we further investigate the Lambda baryon polarization asymmetry alpha in
Lambda_b to Lambda gamma and the forward-backward asymmetry A_{FB} in Lambda_b
to Lambda l^{+} l^{-}. Both two observables (alpha and A_{FB}) are independent
of hadronic form factors in leading power of 1/m_b and in leading order of
alpha_s. We also extend the analysis of hadronic matrix elements for Omega_b to
Omega transitions to rare Omega_b to Omega gamma and Omega_b to Omega l^{+}
l^{-} decays and find that radiative Omega_b to Omega gamma decay is probably
the most promising FCNC b to s radiative baryonic decay channel. In addition,
it is interesting to notice that the zero-point of forward-backward asymmetry
of Omega_b to Omega l^{+} l^{-} is the same as the one for Lambda_b to Lambda
l^{+} l^{-} to leading order accuracy provided that the form factors
\bar{\zeta}_i (i=3, 4, 5) are numerically as small as indicated from the quark
model.
| [
{
"created": "Tue, 8 Nov 2011 10:05:00 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Mannel",
"Thomas",
""
],
[
"Wang",
"Yu-Ming",
""
]
] | We analyze heavy-to-light baryonic form factors at large recoil and derive the scaling behavior of these form factors in the heavy quark limit. It is shown that only one universal form factor is needed to parameterize Lambda_b to p and Lambda_b to Lambda matrix elements in the large recoil limit of light baryons, while hadronic matrix elements of Lambda_b to Sigma transition vanish in the large energy limit of Sigma baryon due to the space-time parity symmetry. The scaling law of the soft form factor eta(P^{\prime} \cdot v), P^{\prime} and v being the momentum of nucleon and the velocity of Lambda_b baryon, responsible for Lambda_b to p transitions is also derived using the nucleon distribution amplitudes in leading conformal spin. In particular, we verify that this scaling behavior is in full agreement with that from light-cone sum rule approach in the heavy-quark limit. With these form factors, we further investigate the Lambda baryon polarization asymmetry alpha in Lambda_b to Lambda gamma and the forward-backward asymmetry A_{FB} in Lambda_b to Lambda l^{+} l^{-}. Both two observables (alpha and A_{FB}) are independent of hadronic form factors in leading power of 1/m_b and in leading order of alpha_s. We also extend the analysis of hadronic matrix elements for Omega_b to Omega transitions to rare Omega_b to Omega gamma and Omega_b to Omega l^{+} l^{-} decays and find that radiative Omega_b to Omega gamma decay is probably the most promising FCNC b to s radiative baryonic decay channel. In addition, it is interesting to notice that the zero-point of forward-backward asymmetry of Omega_b to Omega l^{+} l^{-} is the same as the one for Lambda_b to Lambda l^{+} l^{-} to leading order accuracy provided that the form factors \bar{\zeta}_i (i=3, 4, 5) are numerically as small as indicated from the quark model. |
1301.3478 | Denis Parganlija | Denis Parganlija (Vienna, Tech. U.), Peter Kovacs (Budapest, RMKI),
Gyorgy Wolf (Budapest, RMKI), Francesco Giacosa (Frankfurt U.) and Dirk H.
Rischke (Frankfurt U. and Frankfurt U., FIAS) | Eta, Eta' and eLSM | Prepared for Proceedings of Xth Conference on Quark Confinement and
the Hadron Spectrum, October 8-12, 2012, TUM Campus Garching, Munich,
Germany. 8 pages. v2 contains updated reference list | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the eta-eta' mixing in the Extended Linear Sigma Model (eLSM).
| [
{
"created": "Tue, 15 Jan 2013 20:33:03 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2013 18:09:21 GMT",
"version": "v2"
}
] | 2013-03-27 | [
[
"Parganlija",
"Denis",
"",
"Vienna, Tech. U."
],
[
"Kovacs",
"Peter",
"",
"Budapest, RMKI"
],
[
"Wolf",
"Gyorgy",
"",
"Budapest, RMKI"
],
[
"Giacosa",
"Francesco",
"",
"Frankfurt U."
],
[
"Rischke",
"Dirk H.",
"",
"Frankfurt U. and Frankfurt U., FIAS"
]
] | We discuss the eta-eta' mixing in the Extended Linear Sigma Model (eLSM). |
hep-ph/0604123 | Ana Julia Mizher | Ana J\'ulia Mizher, Eduardo S. Fraga and Gast\~ao Krein | Langevin dynamics of the deconfinement transition for pure gauge theory | 4 pages, 3 figures. To appear in the proceedings of I Latin American
Workshop on High Energy Phenomenology (LAWHEP 2005), Porto Alegre, Brazil,
1-3 Dec 2005. v2: minor corrections | Braz.J.Phys.37:605-608,2007 | 10.1590/S0103-97332007000400022 | null | hep-ph hep-lat hep-th | null | We investigate the effects of dissipation in the deconfinement transition for
pure SU(2) and SU(3) gauge theories. Using an effective theory for the order
parameter, we study its Langevin evolution numerically. Noise effects are
included for the case of SU(2). We find that both dissipation and noise have
dramatic effects on the spinodal decomposition of the order parameter and delay
considerably its thermalization. For SU(3) the effects of dissipation are even
larger than for SU(2).
| [
{
"created": "Thu, 13 Apr 2006 16:30:22 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2006 18:26:13 GMT",
"version": "v2"
}
] | 2011-08-04 | [
[
"Mizher",
"Ana Júlia",
""
],
[
"Fraga",
"Eduardo S.",
""
],
[
"Krein",
"Gastão",
""
]
] | We investigate the effects of dissipation in the deconfinement transition for pure SU(2) and SU(3) gauge theories. Using an effective theory for the order parameter, we study its Langevin evolution numerically. Noise effects are included for the case of SU(2). We find that both dissipation and noise have dramatic effects on the spinodal decomposition of the order parameter and delay considerably its thermalization. For SU(3) the effects of dissipation are even larger than for SU(2). |
1410.3165 | Hua Xing Zhu | Jun Gao and Hua Xing Zhu | Top-quark forward-backward asymmetry in e+e- annihilation at NNLO in QCD | 6 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1408.5150 | Phys. Rev. Lett. 113, 262001 (2014) | 10.1103/PhysRevLett.113.262001 | SLAC-PUB-16101, SMU-HEP-14-08 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a complete calculation of electroweak production of top quark
pairs in $e^+e^-$ annihilation at next-to-next-to-leading order in Quantum
Chromodynamics. Our setup is fully differential and can be used to calculate
any infrared-safe observable. Especially we calculated the
next-to-next-to-leading order corrections to top-quark forward-backward
asymmetry and found sizable effects. Our results show a large reduction of the
theoretical uncertainties in predictions of the forward-backward asymmetry, and
allow a precision determination of the top quark electroweak couplings at
future $e^+e^-$ colliders.
| [
{
"created": "Sun, 12 Oct 2014 23:25:39 GMT",
"version": "v1"
}
] | 2015-01-07 | [
[
"Gao",
"Jun",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | We report on a complete calculation of electroweak production of top quark pairs in $e^+e^-$ annihilation at next-to-next-to-leading order in Quantum Chromodynamics. Our setup is fully differential and can be used to calculate any infrared-safe observable. Especially we calculated the next-to-next-to-leading order corrections to top-quark forward-backward asymmetry and found sizable effects. Our results show a large reduction of the theoretical uncertainties in predictions of the forward-backward asymmetry, and allow a precision determination of the top quark electroweak couplings at future $e^+e^-$ colliders. |
1102.4214 | Mauro Anselmino | Mauro Anselmino, Vincenzo Barone and Aram Kotzinian | SIDIS in the target fragmentation region: polarized and transverse
momentum dependent fracture functions | 18 pages, 2 figures. Some equations modified and text shortened; main
conclusions unchanged | Phys.Lett.B699:108-118,2011 | 10.1016/j.physletb.2011.03.067 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The target fragmentation region of semi-inclusive deep inelastic scattering
is described at leading twist, taking beam and target polarizations into
account. The formalism of polarized and transverse-momentum dependent fracture
functions is developed and the observables for some specific processes are
presented.
| [
{
"created": "Mon, 21 Feb 2011 13:13:15 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2011 15:47:07 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Anselmino",
"Mauro",
""
],
[
"Barone",
"Vincenzo",
""
],
[
"Kotzinian",
"Aram",
""
]
] | The target fragmentation region of semi-inclusive deep inelastic scattering is described at leading twist, taking beam and target polarizations into account. The formalism of polarized and transverse-momentum dependent fracture functions is developed and the observables for some specific processes are presented. |
hep-ph/9805213 | Yang Chun-Bin | C.B. Yang and X. Cai (Hua-Zhong Normal Univ. China) | Scaling Behavior of Multiplicity Distribution under First-Order
Quark-Hadron Phase Transition | 5 pages in Revtex, 5 eps figures | J.Phys.G25:485-492,1999 | 10.1088/0954-3899/25/3/001 | null | hep-ph | null | Multiplicity distribution in small bins is studied within the Ginzburg-Landau
description for first-order quark-hadron phase transition. Direct comparison of
the distribution with a Poisson one (with the same average) is made. Dynamical
factor $d_q$ for the distributionand ratio $D_q\equiv d_q/d_1$ are studied, and
novel scaling behaviors between $D_q$ are found which can be used to detect the
formation of quark-gluon plasma.
| [
{
"created": "Mon, 4 May 1998 06:34:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Yang",
"C. B.",
"",
"Hua-Zhong Normal Univ. China"
],
[
"Cai",
"X.",
"",
"Hua-Zhong Normal Univ. China"
]
] | Multiplicity distribution in small bins is studied within the Ginzburg-Landau description for first-order quark-hadron phase transition. Direct comparison of the distribution with a Poisson one (with the same average) is made. Dynamical factor $d_q$ for the distributionand ratio $D_q\equiv d_q/d_1$ are studied, and novel scaling behaviors between $D_q$ are found which can be used to detect the formation of quark-gluon plasma. |
1712.06450 | Felix Karbstein | Holger Gies, Felix Karbstein, Christian Kohlf\"urst, Nico Seegert | Photon-photon scattering at the high-intensity frontier | 7 pages, 2 figures; matches journal version | Phys. Rev. D 97, 076002 (2018) | 10.1103/PhysRevD.97.076002 | null | hep-ph hep-th physics.optics physics.plasm-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tremendous progress in high-intensity laser technology and the
establishment of dedicated high-field laboratories in recent years have paved
the way towards a first observation of quantum vacuum nonlinearities at the
high-intensity frontier. We advocate a particularly prospective scenario, where
three synchronized high-intensity laser pulses are brought into collision,
giving rise to signal photons, whose frequency and propagation direction differ
from the driving laser pulses, thus providing various means to achieve an
excellent signal to background separation. Based on the theoretical concept of
vacuum emission, we employ an efficient numerical algorithm which allows us to
model the collision of focused high-intensity laser pulses in unprecedented
detail. We provide accurate predictions for the numbers of signal photons
accessible in experiment. Our study paves the way for a first verification of
quantum vacuum nonlinearity in a well-controlled laboratory experiment at one
of the many high-intensity laser facilities currently coming online.
| [
{
"created": "Fri, 15 Dec 2017 14:22:44 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2018 09:30:41 GMT",
"version": "v2"
}
] | 2018-04-11 | [
[
"Gies",
"Holger",
""
],
[
"Karbstein",
"Felix",
""
],
[
"Kohlfürst",
"Christian",
""
],
[
"Seegert",
"Nico",
""
]
] | The tremendous progress in high-intensity laser technology and the establishment of dedicated high-field laboratories in recent years have paved the way towards a first observation of quantum vacuum nonlinearities at the high-intensity frontier. We advocate a particularly prospective scenario, where three synchronized high-intensity laser pulses are brought into collision, giving rise to signal photons, whose frequency and propagation direction differ from the driving laser pulses, thus providing various means to achieve an excellent signal to background separation. Based on the theoretical concept of vacuum emission, we employ an efficient numerical algorithm which allows us to model the collision of focused high-intensity laser pulses in unprecedented detail. We provide accurate predictions for the numbers of signal photons accessible in experiment. Our study paves the way for a first verification of quantum vacuum nonlinearity in a well-controlled laboratory experiment at one of the many high-intensity laser facilities currently coming online. |
0809.2669 | Manuel B\"ahr | Manuel B\"ahr, Stefan Gieseke and Michael H. Seymour | Underlying events in Herwig++ | 4 pages, 3 figures, to appear in the proceedings of the "HERA and the
LHC" workshop | null | null | CERN-PH-TH-2008-195, KA-TP-22-2008, MCnet/08/11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution we describe the new model of multiple partonic
interactions (MPI) that has been implemented in Herwig++. Tuning its two free
parameters is enough to find a good description of CDF underlying event data.
We show extrapolations to the LHC and compare them to results from other
models.
| [
{
"created": "Tue, 16 Sep 2008 13:36:12 GMT",
"version": "v1"
}
] | 2008-09-17 | [
[
"Bähr",
"Manuel",
""
],
[
"Gieseke",
"Stefan",
""
],
[
"Seymour",
"Michael H.",
""
]
] | In this contribution we describe the new model of multiple partonic interactions (MPI) that has been implemented in Herwig++. Tuning its two free parameters is enough to find a good description of CDF underlying event data. We show extrapolations to the LHC and compare them to results from other models. |
hep-ph/9805234 | Francesco Murgia | M. Anselmino (1), M. Bertini (1 and 2), F. Murgia (3) and B. Pire (4)
((1) University and INFN, Torino, Italy, (2) IPN, Lyon, France, (3)
University and INFN, Cagliari, Italy, (4) CPhT, Ecole Polytechnique, France) | Off-diagonal helicity density matrix elements for heavy vector mesons
inclusively produced in N-N, gamma-N, l-N interactions | LaTeX, 10 pages, 1 postscript figure, uses epsfig.sty. Revised
version, to be published on Phys. Lett. B. Some statements added to clarify
text | Phys.Lett. B438 (1998) 347-352 | 10.1016/S0370-2693(98)00978-2 | DFTT 16/98, CPhT-S610-0498, INFNCA-TH9804 | hep-ph | null | Final state interactions in quark fragmentation may give origin to non zero
values of the off-diagonal element rho_(1,-1) of the helicity density matrix of
vector mesons V produced in current jets, with a large energy fraction x_E; the
value of rho_(1,-1)(V) is related to the hard constituent dynamics and tests
unusual properties of it. Some recent data on phi, K^* and D^* produced in e^+
e^- annihilations at LEP show such effects. Predictions are given here for
rho_(1,-1) of heavy mesons produced in nucleon-nucleon, gamma-nucleon and
lepton-nucleon interactions.
| [
{
"created": "Wed, 6 May 1998 12:33:24 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 1998 13:33:01 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Anselmino",
"M.",
"",
"1 and 2"
],
[
"Bertini",
"M.",
"",
"1 and 2"
],
[
"Murgia",
"F.",
""
],
[
"Pire",
"B.",
""
]
] | Final state interactions in quark fragmentation may give origin to non zero values of the off-diagonal element rho_(1,-1) of the helicity density matrix of vector mesons V produced in current jets, with a large energy fraction x_E; the value of rho_(1,-1)(V) is related to the hard constituent dynamics and tests unusual properties of it. Some recent data on phi, K^* and D^* produced in e^+ e^- annihilations at LEP show such effects. Predictions are given here for rho_(1,-1) of heavy mesons produced in nucleon-nucleon, gamma-nucleon and lepton-nucleon interactions. |
1809.09500 | Francesco Murgia | M. Anselmino, M. Boglione, U. D'Alesio, F. Murgia, A. Prokudin | Role of transverse momentum dependence of unpolarised parton
distribution and fragmentation functions in the analysis of azimuthal spin
asymmetries | 21 pages, 9 figures (18 eps plots) | Phys. Rev. D 98, 094023 (2018) | 10.1103/PhysRevD.98.094023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Information on the Sivers distribution and the Collins fragmentation
functions and their transverse momentum dependence is mainly based on fitting
single spin asymmetry data from semi-inclusive deep inelastic scattering
(SIDIS). Independent information, respectively on the Sivers distribution and
the Collins fragmentation, can be obtained from Drell-Yan and $e^+e^-$
annihilation processes. In the SIDIS case, the transverse momentum of the final
observed hadron, which is the quantity measured, is generated both by the
average transverse momentum in the distribution and in the fragmentation
functions. As a consequence, these are strongly correlated and a separate
extraction is made difficult. In this paper we investigate, in a simple
kinematical Gaussian configuration, this correlation, its role on the
transverse single spin asymmetries in SIDIS and the consequences for
predictions of the Sivers asymmetry in Drell-Yan processes and for the Collins
asymmetry in $e^+e^-$ annihilation. We find that, in some cases, these effects
can be relevant and must be carefully taken into account.
| [
{
"created": "Tue, 25 Sep 2018 14:03:02 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Murgia",
"F.",
""
],
[
"Prokudin",
"A.",
""
]
] | Information on the Sivers distribution and the Collins fragmentation functions and their transverse momentum dependence is mainly based on fitting single spin asymmetry data from semi-inclusive deep inelastic scattering (SIDIS). Independent information, respectively on the Sivers distribution and the Collins fragmentation, can be obtained from Drell-Yan and $e^+e^-$ annihilation processes. In the SIDIS case, the transverse momentum of the final observed hadron, which is the quantity measured, is generated both by the average transverse momentum in the distribution and in the fragmentation functions. As a consequence, these are strongly correlated and a separate extraction is made difficult. In this paper we investigate, in a simple kinematical Gaussian configuration, this correlation, its role on the transverse single spin asymmetries in SIDIS and the consequences for predictions of the Sivers asymmetry in Drell-Yan processes and for the Collins asymmetry in $e^+e^-$ annihilation. We find that, in some cases, these effects can be relevant and must be carefully taken into account. |
2012.03839 | Joydeep Chakrabortty | Supratim Das Bakshi, Joydeep Chakrabortty, Michael Spannowsky | Classifying Standard Model Extensions Effectively with Precision
Observables | 19 pages, 9 figures | Phys. Rev. D 103, 056019 (2021) | 10.1103/PhysRevD.103.056019 | IPPP/20/63 | hep-ph hep-ex hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Effective theories are well established theoretical frameworks to describe
the effect of energetically widely separated UV models on observables at lower
energy scales. Due to the complexity of the effective theory when taking all
the Standard Model symmetries and degrees of freedoms into account, tensioning
the entire system in a completely agnostic way against experimental
measurements results in constraints on the Wilson Coefficients of the effective
operators that either bears little information or challenge intrinsic
assumptions imposed on the effective field theory framework. In general, a
specific high-scale extension of the Standard Model only induces a subset of
all possible operators. Thus, by investigating which operators are induced by
different classes of the Standard Model extensions and comparing to which
precision observables they contribute, we show that it is possible to obtain an
improved understanding of which UV model is realised in nature. We consider 15
UV models which are single scalar field extensions of the Standard Model and
compute their dimension-6 operators after integrating out the heavy scalars up
to 1-loop level. Only very few of these scenarios remain indistinguishable,
while most of the models can be phenomenologically separated from one another.
Most of these scenarios possess their own characteristic operator signature.
Following the approach outlined here, a comparative analysis of a wide range of
models will allow to assess at what level the effective field theory series can
be truncated and which experimental measurements to prioritise.
| [
{
"created": "Mon, 7 Dec 2020 16:39:46 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Bakshi",
"Supratim Das",
""
],
[
"Chakrabortty",
"Joydeep",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Effective theories are well established theoretical frameworks to describe the effect of energetically widely separated UV models on observables at lower energy scales. Due to the complexity of the effective theory when taking all the Standard Model symmetries and degrees of freedoms into account, tensioning the entire system in a completely agnostic way against experimental measurements results in constraints on the Wilson Coefficients of the effective operators that either bears little information or challenge intrinsic assumptions imposed on the effective field theory framework. In general, a specific high-scale extension of the Standard Model only induces a subset of all possible operators. Thus, by investigating which operators are induced by different classes of the Standard Model extensions and comparing to which precision observables they contribute, we show that it is possible to obtain an improved understanding of which UV model is realised in nature. We consider 15 UV models which are single scalar field extensions of the Standard Model and compute their dimension-6 operators after integrating out the heavy scalars up to 1-loop level. Only very few of these scenarios remain indistinguishable, while most of the models can be phenomenologically separated from one another. Most of these scenarios possess their own characteristic operator signature. Following the approach outlined here, a comparative analysis of a wide range of models will allow to assess at what level the effective field theory series can be truncated and which experimental measurements to prioritise. |
1411.1654 | George Rupp | Marco Cardoso, George Rupp, and Eef van Beveren | Unquenched quark-model calculation of X(3872) electromagnetic decays | 10 pages, 2 figures (3 plots), 10 tables, SVJOUR style; v2: typos
corrected, 2 references added, remarks added on dipole approximation, version
accepted for publication in Eur. Phys. J. C | Eur. Phys. J. C 75 (2015) 26 | 10.1140/epjc/s10052-014-3254-z | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent quark-model description of X(3872) as an unquenched $2\,{}^{3\!}P_1$
$c\bar{c}$ state is generalised by now including all relevant meson-meson
configurations, in order to calculate the widths of the experimentally observed
electromagnetic decays $X(3872) \to \gamma J/\psi$ and $X(3872) \to
\gamma\psi(2S)$. Interestingly, the inclusion of additional two-meson channels,
most importantly $D^\pm D^{\star\mp}$, leads to a sizeable increase of the
$c\bar{c}$ probability in the total wave function, although the
$D^0\bar{D}^{\star0}$ component remains the dominant one. As for the
electromagnetic decays, unquenching strongly reduces the $\gamma\psi(2S)$ decay
rate yet even more sharply enhances the $\gamma J/\psi$ rate, resulting in a
decay ratio compatible with one experimental observation but in slight
disagreement with two others. Nevertheless, the results show a dramatic
improvement as compared to a quenched calculation with the same confinement
force and parameters. Concretely, we obtain $\Gamma ( X(3872) \to \gamma
\psi(2S) )=28.9$ keV and $\Gamma ( X(3872) \to \gamma J/\psi)=24.7$ keV, with
branching ratio $\mathcal{R}_{\gamma\psi}=1.17$.
| [
{
"created": "Thu, 6 Nov 2014 16:22:14 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Dec 2014 13:20:01 GMT",
"version": "v2"
}
] | 2015-01-28 | [
[
"Cardoso",
"Marco",
""
],
[
"Rupp",
"George",
""
],
[
"van Beveren",
"Eef",
""
]
] | A recent quark-model description of X(3872) as an unquenched $2\,{}^{3\!}P_1$ $c\bar{c}$ state is generalised by now including all relevant meson-meson configurations, in order to calculate the widths of the experimentally observed electromagnetic decays $X(3872) \to \gamma J/\psi$ and $X(3872) \to \gamma\psi(2S)$. Interestingly, the inclusion of additional two-meson channels, most importantly $D^\pm D^{\star\mp}$, leads to a sizeable increase of the $c\bar{c}$ probability in the total wave function, although the $D^0\bar{D}^{\star0}$ component remains the dominant one. As for the electromagnetic decays, unquenching strongly reduces the $\gamma\psi(2S)$ decay rate yet even more sharply enhances the $\gamma J/\psi$ rate, resulting in a decay ratio compatible with one experimental observation but in slight disagreement with two others. Nevertheless, the results show a dramatic improvement as compared to a quenched calculation with the same confinement force and parameters. Concretely, we obtain $\Gamma ( X(3872) \to \gamma \psi(2S) )=28.9$ keV and $\Gamma ( X(3872) \to \gamma J/\psi)=24.7$ keV, with branching ratio $\mathcal{R}_{\gamma\psi}=1.17$. |
1910.08561 | Ethan Neil | Thomas DeGrand and Ethan T. Neil | Repurposing lattice QCD results for composite phenomenology | 36 pages, 14 figures. v2: updated to journal version, including new
appendix on pion decay constant conventions | Phys. Rev. D 101, 034504 (2020) | 10.1103/PhysRevD.101.034504 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of proposed extensions of the Standard Model include new strongly
interacting dynamics, in the form of SU(N) gauge fields coupled to various
numbers of fermions. Often, these extensions allow N = 3 as a plausible choice,
or even require N = 3, such as in twin Higgs models, where the new dynamics is
a "copy" of QCD. However, the fermion masses in such a sector are typically
different from (often heavier than) the ones of real-world QCD, relative to the
confinement scale. Many of the strong interaction masses and matrix elements
for SU(3) at heavy fermion masses have already been computed on the lattice,
typically as a byproduct of the approach to the physical point of real QCD. We
provide a summary of these relevant results for the phenomenological community.
| [
{
"created": "Fri, 18 Oct 2019 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 2020 18:30:47 GMT",
"version": "v2"
}
] | 2020-02-25 | [
[
"DeGrand",
"Thomas",
""
],
[
"Neil",
"Ethan T.",
""
]
] | A number of proposed extensions of the Standard Model include new strongly interacting dynamics, in the form of SU(N) gauge fields coupled to various numbers of fermions. Often, these extensions allow N = 3 as a plausible choice, or even require N = 3, such as in twin Higgs models, where the new dynamics is a "copy" of QCD. However, the fermion masses in such a sector are typically different from (often heavier than) the ones of real-world QCD, relative to the confinement scale. Many of the strong interaction masses and matrix elements for SU(3) at heavy fermion masses have already been computed on the lattice, typically as a byproduct of the approach to the physical point of real QCD. We provide a summary of these relevant results for the phenomenological community. |
hep-ph/9802358 | Christopher Kolda | Christopher Kolda and John March-Russell (IAS, Princeton) | Supersymmetric D-term Inflation, Reheating and Affleck-Dine Baryogenesis | 23 pages LaTeX | Phys.Rev. D60 (1999) 023504 | 10.1103/PhysRevD.60.023504 | IASSNS-HEP-98/007 | hep-ph astro-ph | null | The phenomenology of supersymmetric models of inflation, where the
inflationary vacuum energy is dominated by D-terms of a U(1), is investigated.
Particular attention is paid to the questions of how to arrange for sufficient
e-folds of inflation to occur, what kind of thermal history is expected after
the end of inflation, and how to implement successful baryogenesis. Such models
are argued to require a more restrictive symmetry structure than previously
thought. In particular, it is non-trivial that the decays of the fields driving
D-inflation can reheat the universe in such a way as to avoid the strong
gravitino production constraints. We also show how the initial conditions for
Affleck-Dine baryogenesis can arise in these models and that the simplest flat
directions along which baryon number is generated can often be ruled out by the
constraints coming from decoherence of the condensate in a hot environment. At
the end, we find that successful reheating and baryogenesis can take place in a
large subset of D-inflationary models.
| [
{
"created": "Thu, 19 Feb 1998 07:43:05 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kolda",
"Christopher",
"",
"IAS, Princeton"
],
[
"March-Russell",
"John",
"",
"IAS, Princeton"
]
] | The phenomenology of supersymmetric models of inflation, where the inflationary vacuum energy is dominated by D-terms of a U(1), is investigated. Particular attention is paid to the questions of how to arrange for sufficient e-folds of inflation to occur, what kind of thermal history is expected after the end of inflation, and how to implement successful baryogenesis. Such models are argued to require a more restrictive symmetry structure than previously thought. In particular, it is non-trivial that the decays of the fields driving D-inflation can reheat the universe in such a way as to avoid the strong gravitino production constraints. We also show how the initial conditions for Affleck-Dine baryogenesis can arise in these models and that the simplest flat directions along which baryon number is generated can often be ruled out by the constraints coming from decoherence of the condensate in a hot environment. At the end, we find that successful reheating and baryogenesis can take place in a large subset of D-inflationary models. |
2003.03386 | Sudip Jana | Sudip Jana, Vishnu P.K. and Shaikh Saad | Resolving electron and muon $g-2$ within the 2HDM | 14 pages, 6 figures, matches published version | Phys. Rev. D 101, 115037 (2020) | 10.1103/PhysRevD.101.115037 | OSU-HEP-20-01 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent precise measurement of the electron anomalous magnetic moment (AMM)
adds to the longstanding tension of the muon AMM and together strongly point
towards physics beyond the Standard Model (BSM). In this work, we propose a
solution to both anomalies in an economical fashion via a light scalar that
emerges from a second Higgs doublet and resides in the $\mathcal{O}(10)$-MeV to
$\mathcal{O}(1)$-GeV mass range yielding the right sizes and signs for these
deviations due to one-loop and two-loop dominance for the muon and the
electron, respectively. A scalar of this type is subject to a number of various
experimental constraints, however, as we show, it can remain sufficiently light
by evading all experimental bounds and has the great potential to be discovered
in the near-future low-energy experiments. The analysis provided here is
equally applicable to any BSM scenario for which a light scalar is allowed to
have sizable flavor-diagonal couplings to the charged leptons. In addition to
the light scalar, our theory predicts the existence of a nearly degenerate
charged scalar and a pseudoscalar, which have masses of the order of the
electroweak scale. We analyze possible ways to probe new-physics signals at
colliders and find that this scenario can be tested at the LHC by looking at
the novel process $pp \to H^\pm H^\pm jj \to l^\pm l^\pm j j +
{E\!\!\!\!/}_{T}$ via same-sign pair production of charged Higgs bosons.
| [
{
"created": "Fri, 6 Mar 2020 19:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2020 13:44:45 GMT",
"version": "v2"
}
] | 2020-06-30 | [
[
"Jana",
"Sudip",
""
],
[
"K.",
"Vishnu P.",
""
],
[
"Saad",
"Shaikh",
""
]
] | Recent precise measurement of the electron anomalous magnetic moment (AMM) adds to the longstanding tension of the muon AMM and together strongly point towards physics beyond the Standard Model (BSM). In this work, we propose a solution to both anomalies in an economical fashion via a light scalar that emerges from a second Higgs doublet and resides in the $\mathcal{O}(10)$-MeV to $\mathcal{O}(1)$-GeV mass range yielding the right sizes and signs for these deviations due to one-loop and two-loop dominance for the muon and the electron, respectively. A scalar of this type is subject to a number of various experimental constraints, however, as we show, it can remain sufficiently light by evading all experimental bounds and has the great potential to be discovered in the near-future low-energy experiments. The analysis provided here is equally applicable to any BSM scenario for which a light scalar is allowed to have sizable flavor-diagonal couplings to the charged leptons. In addition to the light scalar, our theory predicts the existence of a nearly degenerate charged scalar and a pseudoscalar, which have masses of the order of the electroweak scale. We analyze possible ways to probe new-physics signals at colliders and find that this scenario can be tested at the LHC by looking at the novel process $pp \to H^\pm H^\pm jj \to l^\pm l^\pm j j + {E\!\!\!\!/}_{T}$ via same-sign pair production of charged Higgs bosons. |
hep-ph/9406246 | null | Carl H. Albright and Satyanarayan Nandi | Comparison of SO(10)-Symmetric Fermion Mass Matrices with and without
Degenerate Neutrinos | 12 pages, FERMILAB-PUB-94/119-T and OSU Preprint 289, plain LaTeX | null | null | null | hep-ph | null | It has been recently suggested by others that one can simultaneously explain
the depletions of solar electron-neutrinos and atmospheric muon-neutrinos along
with a 7 eV neutrino component of mixed dark matter by postulating the
existence of nearly-degenerate 2 eV neutrinos with the correct mixing
parameters. We study this claim in the framework of a simple SO(10)-symmetric
model constructed from the low scale data using a bottom-up procedure recently
advanced by the authors and compare the results with and without degenerate
neutrinos.
| [
{
"created": "Tue, 7 Jun 1994 18:45:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Albright",
"Carl H.",
""
],
[
"Nandi",
"Satyanarayan",
""
]
] | It has been recently suggested by others that one can simultaneously explain the depletions of solar electron-neutrinos and atmospheric muon-neutrinos along with a 7 eV neutrino component of mixed dark matter by postulating the existence of nearly-degenerate 2 eV neutrinos with the correct mixing parameters. We study this claim in the framework of a simple SO(10)-symmetric model constructed from the low scale data using a bottom-up procedure recently advanced by the authors and compare the results with and without degenerate neutrinos. |
hep-ph/0212188 | Schweizer Julia | J. Schweizer (Bern University) | Explicit generating functional for pions and virtual photons | 20 pages, 2 figures; version accepted for publication, minor
typographical changes, acknowledgments added | JHEP 0302 (2003) 007 | 10.1088/1126-6708/2003/02/007 | Preprint BUTP-02/13 | hep-ph | null | We construct the explicit one-loop functional of chiral perturbation theory
for two light flavours, including virtual photons. We stick to contributions
where 1 or 2 mesons and at most one photon are running in the loops. With the
explicit functional at hand, the evaluation of the relevant Green functions
boils down to performing traces over the flavour matrices. For illustration, we
work out the pi+ pi- -> pi0 pi0 scattering amplitude at threshold at order p^4,
e^2p^2.
| [
{
"created": "Fri, 13 Dec 2002 12:17:25 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Mar 2003 10:38:49 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Schweizer",
"J.",
"",
"Bern University"
]
] | We construct the explicit one-loop functional of chiral perturbation theory for two light flavours, including virtual photons. We stick to contributions where 1 or 2 mesons and at most one photon are running in the loops. With the explicit functional at hand, the evaluation of the relevant Green functions boils down to performing traces over the flavour matrices. For illustration, we work out the pi+ pi- -> pi0 pi0 scattering amplitude at threshold at order p^4, e^2p^2. |
2306.02118 | Leszek Motyka | Leszek Motyka and Mariusz Sadzikowski (Jagiellonian University) | Twist decomposition of non-linear effects in Balitsky-Kovchegov
evolution of proton structure functions | 21 pages, 3 figures, the final version published in European Physical
Journal C | Eur.Phys.J.C 83 (2023) 11, 1062 | 10.1140/epjc/s10052-023-12241-z | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Effects of non-linear small-x evolution of the gluon distribution given by
the Balitsky-Kovchegov equation are analyzed within the collinear approximation
framework. We perform a twist decomposition of the proton structure functions
F2 and FL obtained from the Balitsky-Kovchegov equation using the Mellin
representation of the scattering cross-sections at high energies. In both the
structure functions we find strong corrections coming from the non-linear
effects in the gluon evolution at twist 2, and strongly suppressed higher twist
effects. This implies that unitarization effects of high energy scattering
amplitudes are mostly the leading twist effect. Furthermore we consider the
double logarithmic limit of the Balitsky--Kovchegov equation for the collinear
gluon distribution, and compare the result to the Gribov-Levin-Ryskin equation.
We find that these two equations differ by two powers of the hard scale
logarithm for the large scales.
| [
{
"created": "Sat, 3 Jun 2023 14:12:36 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2023 10:24:37 GMT",
"version": "v2"
}
] | 2023-12-08 | [
[
"Motyka",
"Leszek",
"",
"Jagiellonian University"
],
[
"Sadzikowski",
"Mariusz",
"",
"Jagiellonian University"
]
] | Effects of non-linear small-x evolution of the gluon distribution given by the Balitsky-Kovchegov equation are analyzed within the collinear approximation framework. We perform a twist decomposition of the proton structure functions F2 and FL obtained from the Balitsky-Kovchegov equation using the Mellin representation of the scattering cross-sections at high energies. In both the structure functions we find strong corrections coming from the non-linear effects in the gluon evolution at twist 2, and strongly suppressed higher twist effects. This implies that unitarization effects of high energy scattering amplitudes are mostly the leading twist effect. Furthermore we consider the double logarithmic limit of the Balitsky--Kovchegov equation for the collinear gluon distribution, and compare the result to the Gribov-Levin-Ryskin equation. We find that these two equations differ by two powers of the hard scale logarithm for the large scales. |
1605.07175 | Hongxi Xing | Zhong-Bo Kang, Jian-Wei Qiu, Xin-Nian Wang, Hongxi Xing | Next-to-leading order transverse momentum broadening for Drell-Yan
production in p+A collisions | 18 pages, 12 figures | Phys. Rev. D 94, 074038 (2016) | 10.1103/PhysRevD.94.074038 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the nuclear transverse momentum broadening for Drell-Yan lepton
pair production in p+A collisions at next-to-leading order (NLO) in powers of
strong coupling constant $\alpha_s$. We verify that the transverse momentum
weighted differential cross section in NLO perturbative QCD (pQCD) at twist-4
can be factorized into the convolution of parton distribution function of an
active parton in the projectile proton, a twist-4 multiparton correlation
function of the target nucleus, and perturbatively calculable hard coefficient
function. We identify a QCD evolution equation for such a twist-4 nuclear
gluon-quark correlation function, and verify its universality -- its process
independence. This finding demonstrates the prediction power of pQCD
factorization approach for studying parton multiple scattering in nuclear
medium.
| [
{
"created": "Mon, 23 May 2016 20:00:00 GMT",
"version": "v1"
}
] | 2016-11-02 | [
[
"Kang",
"Zhong-Bo",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Wang",
"Xin-Nian",
""
],
[
"Xing",
"Hongxi",
""
]
] | We present the nuclear transverse momentum broadening for Drell-Yan lepton pair production in p+A collisions at next-to-leading order (NLO) in powers of strong coupling constant $\alpha_s$. We verify that the transverse momentum weighted differential cross section in NLO perturbative QCD (pQCD) at twist-4 can be factorized into the convolution of parton distribution function of an active parton in the projectile proton, a twist-4 multiparton correlation function of the target nucleus, and perturbatively calculable hard coefficient function. We identify a QCD evolution equation for such a twist-4 nuclear gluon-quark correlation function, and verify its universality -- its process independence. This finding demonstrates the prediction power of pQCD factorization approach for studying parton multiple scattering in nuclear medium. |
1305.5835 | Richard Bonventre | R. Bonventre, A. LaTorre, J.R. Klein, G.D. Orebi Gann, S. Seibert, O.
Wasalski | Non-Standard Models, Solar Neutrinos, and Large \theta_{13} | null | null | 10.1103/PhysRevD.88.053010 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solar neutrino experiments have yet to see directly the transition region
between matter-enhanced and vacuum oscillations. The transition region is
particularly sensitive to models of non-standard neutrino interactions and
propagation. We examine several such non-standard models, which predict a
lower-energy transition region and a flatter survival probability for the ^{8}B
solar neutrinos than the standard large-mixing angle (LMA) model. We find that
while some of the non-standard models provide a better fit to the solar
neutrino data set, the large measured value of \theta_{13} and the size of the
experimental uncertainties lead to a low statistical significance for these
fits. We have also examined whether simple changes to the solar density profile
can lead to a flatter ^{8}B survival probability than the LMA prediction, but
find that this is not the case for reasonable changes. We conclude that the
data in this critical region is still too poor to determine whether any of
these models, or LMA, is the best description of the data.
| [
{
"created": "Fri, 24 May 2013 19:40:56 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Bonventre",
"R.",
""
],
[
"LaTorre",
"A.",
""
],
[
"Klein",
"J. R.",
""
],
[
"Gann",
"G. D. Orebi",
""
],
[
"Seibert",
"S.",
""
],
[
"Wasalski",
"O.",
""
]
] | Solar neutrino experiments have yet to see directly the transition region between matter-enhanced and vacuum oscillations. The transition region is particularly sensitive to models of non-standard neutrino interactions and propagation. We examine several such non-standard models, which predict a lower-energy transition region and a flatter survival probability for the ^{8}B solar neutrinos than the standard large-mixing angle (LMA) model. We find that while some of the non-standard models provide a better fit to the solar neutrino data set, the large measured value of \theta_{13} and the size of the experimental uncertainties lead to a low statistical significance for these fits. We have also examined whether simple changes to the solar density profile can lead to a flatter ^{8}B survival probability than the LMA prediction, but find that this is not the case for reasonable changes. We conclude that the data in this critical region is still too poor to determine whether any of these models, or LMA, is the best description of the data. |
1611.05857 | Thomas Rink | Thomas Rink and Kai Schmitz | Perturbed Yukawa Textures in the Minimal Seesaw Model | 30 pages, 7 figures, 2 tables; v2: updated references, extended
discussion in the introduction and conclusions, new title, results unchanged,
content matches version published in JHEP | null | 10.1007/JHEP03(2017)158 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | \noindent We revisit the \textit{minimal seesaw model}, i.e., the type-I
seesaw mechanism involving only two right-handed neutrinos. % This model
represents an important minimal benchmark scenario for future experimental
updates on neutrino oscillations. % It features four real parameters that
cannot be fixed by the current data: two $CP$-violating phases, $\delta$ and
$\sigma$, as well as one complex parameter, $z$, that is experimentally
inaccessible at low energies. % The parameter $z$ controls the structure of the
neutrino Yukawa matrix at high energies, which is why it may be regarded as a
label or index for all UV completions of the minimal seesaw model. % The fact
that $z$ encompasses only two real degrees of freedom allows us to
systematically scan the minimal seesaw model over all of its possible UV
completions. % In doing so, we address the following question: Suppose $\delta$
and $\sigma$ should be measured at particular values in the future---to what
extent is one then still able to realize approximate textures in the neutrino
Yukawa matrix? % Our analysis, thus, generalizes previous studies of the
minimal seesaw model based on the assumption of exact texture zeros. % In
particular, our study allows us to assess the theoretical uncertainty inherent
to the common texture ansatz. % One of our main results is that a normal
light-neutrino mass hierarchy is, in fact, still consistent with a two-zero
Yukawa texture, provided that the two texture zeros receive corrections at the
level of $\mathcal{O}\left(\textrm{10}\,\%\right)$. % While our numerical
results pertain to the minimal seesaw model only, our general procedure appears
to be applicable to other neutrino mass models as well.
| [
{
"created": "Thu, 17 Nov 2016 20:59:11 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2017 07:44:10 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Rink",
"Thomas",
""
],
[
"Schmitz",
"Kai",
""
]
] | \noindent We revisit the \textit{minimal seesaw model}, i.e., the type-I seesaw mechanism involving only two right-handed neutrinos. % This model represents an important minimal benchmark scenario for future experimental updates on neutrino oscillations. % It features four real parameters that cannot be fixed by the current data: two $CP$-violating phases, $\delta$ and $\sigma$, as well as one complex parameter, $z$, that is experimentally inaccessible at low energies. % The parameter $z$ controls the structure of the neutrino Yukawa matrix at high energies, which is why it may be regarded as a label or index for all UV completions of the minimal seesaw model. % The fact that $z$ encompasses only two real degrees of freedom allows us to systematically scan the minimal seesaw model over all of its possible UV completions. % In doing so, we address the following question: Suppose $\delta$ and $\sigma$ should be measured at particular values in the future---to what extent is one then still able to realize approximate textures in the neutrino Yukawa matrix? % Our analysis, thus, generalizes previous studies of the minimal seesaw model based on the assumption of exact texture zeros. % In particular, our study allows us to assess the theoretical uncertainty inherent to the common texture ansatz. % One of our main results is that a normal light-neutrino mass hierarchy is, in fact, still consistent with a two-zero Yukawa texture, provided that the two texture zeros receive corrections at the level of $\mathcal{O}\left(\textrm{10}\,\%\right)$. % While our numerical results pertain to the minimal seesaw model only, our general procedure appears to be applicable to other neutrino mass models as well. |
1812.05263 | Balbeer Singh | Balbeer Singh, Aman Abhishek, Santosh K Das, Hiranmaya Mishra | Heavy quark diffusion in a Polyakov loop plasma | 22 pages, 11 figures | Phys. Rev. D 100, 114019 (2019) | 10.1103/PhysRevD.100.114019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the transport coefficients, drag and momentum diffusion, of a
heavy quark in a thermalized plasma of light quarks in the background of
Polyakov loop. Quark thermal mass and the gluon Debye mass are calculated in a
non-trivial Polyakov loop background. The constituent quark masses and the
Polyakov loop is estimated within a Polyakov loop quark meson (PQM) model. The
relevant scattering amplitudes for heavy quark and light partons in the
background of Polyakov loop has been estimated within the matrix model. We have
also compared the results with the Polyakov loop parameter estimated from
lattice QCD simulations. We have studied the temperature and momentum
dependence of heavy quark drag and diffusion coefficients. It is observed that
the temperature dependence of the drag coefficient is quite weak which may play
a key role to understand heavy quark observables at RHIC and LHC energies.
| [
{
"created": "Thu, 13 Dec 2018 05:04:02 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Oct 2019 13:46:33 GMT",
"version": "v2"
}
] | 2019-12-18 | [
[
"Singh",
"Balbeer",
""
],
[
"Abhishek",
"Aman",
""
],
[
"Das",
"Santosh K",
""
],
[
"Mishra",
"Hiranmaya",
""
]
] | We calculate the transport coefficients, drag and momentum diffusion, of a heavy quark in a thermalized plasma of light quarks in the background of Polyakov loop. Quark thermal mass and the gluon Debye mass are calculated in a non-trivial Polyakov loop background. The constituent quark masses and the Polyakov loop is estimated within a Polyakov loop quark meson (PQM) model. The relevant scattering amplitudes for heavy quark and light partons in the background of Polyakov loop has been estimated within the matrix model. We have also compared the results with the Polyakov loop parameter estimated from lattice QCD simulations. We have studied the temperature and momentum dependence of heavy quark drag and diffusion coefficients. It is observed that the temperature dependence of the drag coefficient is quite weak which may play a key role to understand heavy quark observables at RHIC and LHC energies. |
hep-ph/0009346 | Csli | Ya Sheng Yang (PKU) and Chong Sheng Li (PKU) | Electroweak Corrections to the Deacy $H^+\to W^+h$ in the Minimal
Supersymmetric Model | 20 pages, including 7 ps figures | Phys.Lett.B497:101-110,2001 | 10.1016/S0370-2693(00)01306-X | PKU-TH-2000-98 | hep-ph | null | We calculate the $O(\alpha_{ew}m_{t(b)}^{2}/m_{W}^{2})$ and $O(\alpha_{ew}
m_{t(b)}^4/m_W^4)$ supersymmetric electroweak corrections to the process
$H^+\to W^+h$ in the Minimal Supersymmetric Model. These corrections arise from
the virtual effects of the third family quaurks (top and bottom) and squarks
(top-squark and bottom-squark). We find that for $m_{H^+}>200$GeV at low
$\tan\beta(\leq 3)$, the corrections can increase the tree-level decay widths
and the branching radios more than 20% and 40%, respectively.
| [
{
"created": "Fri, 29 Sep 2000 11:49:31 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Yang",
"Ya Sheng",
"",
"PKU"
],
[
"Li",
"Chong Sheng",
"",
"PKU"
]
] | We calculate the $O(\alpha_{ew}m_{t(b)}^{2}/m_{W}^{2})$ and $O(\alpha_{ew} m_{t(b)}^4/m_W^4)$ supersymmetric electroweak corrections to the process $H^+\to W^+h$ in the Minimal Supersymmetric Model. These corrections arise from the virtual effects of the third family quaurks (top and bottom) and squarks (top-squark and bottom-squark). We find that for $m_{H^+}>200$GeV at low $\tan\beta(\leq 3)$, the corrections can increase the tree-level decay widths and the branching radios more than 20% and 40%, respectively. |
1205.1689 | Ahmed Ali | Ahmed Ali (DESY), Fernando Barreiro (UAM, Madrid), Javier Llorente
(UAM, Madrid), Wei Wang (DESY) | Transverse Energy-Energy Correlations in Next-to-Leading Order in
$\alpha_s$ at the LHC | 12 pages, 8 figures, several added references; computed a number of
parametric and PDF uncertainties and quantified the sensitivity of the
correlations to alpha_s(M_Z); version to appear in Physical Review D | null | 10.1103/PhysRevD.86.114017 | DESY 12-063; FTUAM-2012-10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the transverse energy-energy correlation (EEC) and its asymmetry
(AEEC) in next-to-leading order (NLO) in $\alpha_s$ in proton-proton collisions
at the LHC with the center-of-mass energy $E_{\rm c.m.}=7$ TeV. We show that
the transverse EEC and the AEEC distributions are insensitive to the QCD
factorization- and the renormalization-scales, structure functions of the
proton, and for a judicious choice of the jet-size, also the underlying minimum
bias events. Hence they can be used to precisely test QCD in hadron colliders
and determine the strong coupling $\alpha_s$. We illustrate these features by
defining the hadron jets using the anti-$k_T$ jet algorithm and an event
selection procedure employed in the analysis of jets at the LHC and show the
$\alpha_s(M_Z)$-dependence of the transverse EEC and the AEEC in the
anticipated range $0.11 \leq \alpha_s(M_Z) \leq 0.13$.
| [
{
"created": "Tue, 8 May 2012 13:18:09 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2012 12:01:18 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Ali",
"Ahmed",
"",
"DESY"
],
[
"Barreiro",
"Fernando",
"",
"UAM, Madrid"
],
[
"Llorente",
"Javier",
"",
"UAM, Madrid"
],
[
"Wang",
"Wei",
"",
"DESY"
]
] | We compute the transverse energy-energy correlation (EEC) and its asymmetry (AEEC) in next-to-leading order (NLO) in $\alpha_s$ in proton-proton collisions at the LHC with the center-of-mass energy $E_{\rm c.m.}=7$ TeV. We show that the transverse EEC and the AEEC distributions are insensitive to the QCD factorization- and the renormalization-scales, structure functions of the proton, and for a judicious choice of the jet-size, also the underlying minimum bias events. Hence they can be used to precisely test QCD in hadron colliders and determine the strong coupling $\alpha_s$. We illustrate these features by defining the hadron jets using the anti-$k_T$ jet algorithm and an event selection procedure employed in the analysis of jets at the LHC and show the $\alpha_s(M_Z)$-dependence of the transverse EEC and the AEEC in the anticipated range $0.11 \leq \alpha_s(M_Z) \leq 0.13$. |
0710.4504 | Thomas A. Trainor | Thomas A. Trainor | Centrality evolution of $p_t$ and $y_t$ spectra from Au-Au collisions at
$\sqrt{s_{NN}} = 200$ GeV | 21 pages, 18 figures | Int.J.Mod.Phys.E17:1499-1540,2008 | 10.1142/S021830130801057X | null | hep-ph | null | A two-component analysis of spectra to $p_t = 12$ GeV/c for identified pions
and protons from 200 GeV Au-Au collisions is presented. The method is similar
to an analysis of the $n_{ch}$ dependence of $p_t$ spectra from p-p collisions
at 200 GeV, but applied to Au-Au centrality dependence. The soft-component
reference is a L\'evy distribution on transverse mass $m_t$. The hard-component
reference is a Gaussian on $y_t$ with exponential ($p_t$ power-law) tail.
Deviations of data from the reference are described by hard-component ratio
$r_{AA}$ which generalizes nuclear modification factor $R_{AA}$. The analysis
suggests that centrality evolution of pion and proton spectra is dominated by
changes in parton fragmentation. The structure of $r_{AA}$ suggests that parton
energy loss produces a negative boost $\Delta y_t$ of a large fraction (but not
all) of the minimum-bias fragment distribution, and that lower-energy partons
suffer relatively less energy loss, possibly due to color screening. The
analysis also suggests that the anomalous $p/\pi$ ratio may be due to
differences in the parton energy-loss process experienced by the two hadron
species. This analysis provides no evidence for radial flow.
| [
{
"created": "Wed, 24 Oct 2007 16:19:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Trainor",
"Thomas A.",
""
]
] | A two-component analysis of spectra to $p_t = 12$ GeV/c for identified pions and protons from 200 GeV Au-Au collisions is presented. The method is similar to an analysis of the $n_{ch}$ dependence of $p_t$ spectra from p-p collisions at 200 GeV, but applied to Au-Au centrality dependence. The soft-component reference is a L\'evy distribution on transverse mass $m_t$. The hard-component reference is a Gaussian on $y_t$ with exponential ($p_t$ power-law) tail. Deviations of data from the reference are described by hard-component ratio $r_{AA}$ which generalizes nuclear modification factor $R_{AA}$. The analysis suggests that centrality evolution of pion and proton spectra is dominated by changes in parton fragmentation. The structure of $r_{AA}$ suggests that parton energy loss produces a negative boost $\Delta y_t$ of a large fraction (but not all) of the minimum-bias fragment distribution, and that lower-energy partons suffer relatively less energy loss, possibly due to color screening. The analysis also suggests that the anomalous $p/\pi$ ratio may be due to differences in the parton energy-loss process experienced by the two hadron species. This analysis provides no evidence for radial flow. |
2105.09944 | Zurab Silagadze | Abdaljalel Alizzi and Z.K. Silagadze | Ultralight dark photon and Casimir effect | 20 pages, no figures, revtex4. Version to be published in
International Journal of Theoretical Physics | Int. J. Theor. Phys. 61 (2022), 43 | 10.1007/s10773-022-05034-9 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of a dark photon on the Casimir effect and
calculate the corresponding leading contribution to the Casimir energy. For
expected magnitudes of the photon - dark photon mixing parameter, the influence
turns out to be negligible. The plasmon dispersion relation is also not
noticeably modified by the presence of a dark photon.
| [
{
"created": "Thu, 20 May 2021 13:31:29 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2022 13:09:32 GMT",
"version": "v2"
}
] | 2022-02-23 | [
[
"Alizzi",
"Abdaljalel",
""
],
[
"Silagadze",
"Z. K.",
""
]
] | We investigate the influence of a dark photon on the Casimir effect and calculate the corresponding leading contribution to the Casimir energy. For expected magnitudes of the photon - dark photon mixing parameter, the influence turns out to be negligible. The plasmon dispersion relation is also not noticeably modified by the presence of a dark photon. |
hep-ph/9901318 | Carl H. Albright | Carl H. Albright (Northern Illinois U./Fermilab), S.M. Barr (Bartol
Research Institute) | Predicting quark and lepton masses and mixings | 15 pages, LaTeX | Phys.Lett.B452:287-293,1999 | 10.1016/S0370-2693(99)00290-7 | BA-99-05, FERMILAB-Pub-99/007-T | hep-ph | null | A model is presented that fits the quark and lepton masses and mixings
wherein five dimensionless parameters and a phase account for fifteen
dimensionless observables. Among these are the Wolfenstein parameters $\rho$
and $\eta$, the $\nu_e-\nu_{\mu}$ and $\nu_e-\nu_{\tau}$ mixing angles which
are predicted to be small and comparable while the $\nu_{\mu}-\nu_{\tau}$
mixing angle is predicted to be large. The model is based on supersymmetric
SO(10) with the form of the mass matrices motivated by simplicity at the level
of grand unification.
| [
{
"created": "Thu, 14 Jan 1999 23:02:33 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Albright",
"Carl H.",
"",
"Northern Illinois U./Fermilab"
],
[
"Barr",
"S. M.",
"",
"Bartol\n Research Institute"
]
] | A model is presented that fits the quark and lepton masses and mixings wherein five dimensionless parameters and a phase account for fifteen dimensionless observables. Among these are the Wolfenstein parameters $\rho$ and $\eta$, the $\nu_e-\nu_{\mu}$ and $\nu_e-\nu_{\tau}$ mixing angles which are predicted to be small and comparable while the $\nu_{\mu}-\nu_{\tau}$ mixing angle is predicted to be large. The model is based on supersymmetric SO(10) with the form of the mass matrices motivated by simplicity at the level of grand unification. |
2404.16090 | Yong Xu | Basabendu Barman, Nicol\'as Bernal, Yong Xu | Resonant Reheating | v1:28 pages, 11 figures; v2: minor modification, version accepted for
publication in JCAP | null | null | MITP-24-045 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We investigate a novel reheating scenario proceeding through $s$-channel
inflaton annihilation, mediated by a massive scalar. If the inflaton $\phi$
oscillates around the minimum of a monomial potential $\propto \phi^{n}$, we
reveal the emergence of resonance phenomena originating from the dynamic
evolution of the inflaton mass for $n>2$. Consequently, a resonance appears in
both the radiation and the temperature evolution during the reheating process.
By solving the coupled Boltzmann equations, we present solutions for radiation
and temperature. We find non-trivial temperature characteristics during
reheating, depending on the value of $n$ and the masses of the inflaton and
mediator. Some phenomenological aspects of the model are explored. As a
concrete example, we show that the same mediator participates in the genesis of
dark matter, modifying the standard freeze-in dynamics. In addition, we
demonstrate that the resonant reheating scenario could be tested by
next-generation low- and high-frequency gravitational wave detectors.
| [
{
"created": "Wed, 24 Apr 2024 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 07:36:51 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Barman",
"Basabendu",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Xu",
"Yong",
""
]
] | We investigate a novel reheating scenario proceeding through $s$-channel inflaton annihilation, mediated by a massive scalar. If the inflaton $\phi$ oscillates around the minimum of a monomial potential $\propto \phi^{n}$, we reveal the emergence of resonance phenomena originating from the dynamic evolution of the inflaton mass for $n>2$. Consequently, a resonance appears in both the radiation and the temperature evolution during the reheating process. By solving the coupled Boltzmann equations, we present solutions for radiation and temperature. We find non-trivial temperature characteristics during reheating, depending on the value of $n$ and the masses of the inflaton and mediator. Some phenomenological aspects of the model are explored. As a concrete example, we show that the same mediator participates in the genesis of dark matter, modifying the standard freeze-in dynamics. In addition, we demonstrate that the resonant reheating scenario could be tested by next-generation low- and high-frequency gravitational wave detectors. |
2209.13795 | Biaogang Wu | Biaogang Wu, Zhanduo Tang, Min He, Ralf Rapp | Charmonium, $B_c$ and X(3872) Transport at the LHC | null | null | 10.1051/epjconf/202327602001 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We deploy a kinetic-rate equation to evaluate the transport of $J/\psi$,
$\psi(2S)$, $B_c$ and X(3872) in ultra-relativistic heavy-ion collisions and
compare their production yields to experimental data from the Large Hadron
Collider. The rate equation has two main transport parameters, i.e., the
equilibrium limit and reaction rate for each state. The temperature-dependent
equilibrium limits include charm- and bottom-quark fugacities based on their
initial production. The reaction rates for charmonia, bottomonia and $B_c$ rely
on charm- and bottom-quark masses as well as binding energies from a
thermodynamic $T$-matrix approach. For the X(3872) particle, its internal
structure information is encoded in reaction rates and initial conditions in
the hadronic phase via two different scenarios: a loosely bound hadronic
molecule vs. a compact diquark-antidiquark tetraquark.
| [
{
"created": "Wed, 28 Sep 2022 02:56:45 GMT",
"version": "v1"
}
] | 2023-03-22 | [
[
"Wu",
"Biaogang",
""
],
[
"Tang",
"Zhanduo",
""
],
[
"He",
"Min",
""
],
[
"Rapp",
"Ralf",
""
]
] | We deploy a kinetic-rate equation to evaluate the transport of $J/\psi$, $\psi(2S)$, $B_c$ and X(3872) in ultra-relativistic heavy-ion collisions and compare their production yields to experimental data from the Large Hadron Collider. The rate equation has two main transport parameters, i.e., the equilibrium limit and reaction rate for each state. The temperature-dependent equilibrium limits include charm- and bottom-quark fugacities based on their initial production. The reaction rates for charmonia, bottomonia and $B_c$ rely on charm- and bottom-quark masses as well as binding energies from a thermodynamic $T$-matrix approach. For the X(3872) particle, its internal structure information is encoded in reaction rates and initial conditions in the hadronic phase via two different scenarios: a loosely bound hadronic molecule vs. a compact diquark-antidiquark tetraquark. |
hep-ph/9506404 | Jake Lee | C. S. Kim and Jake Lee | Large $p_T$ Hadroproduction of $Z$ as a Probe of Gluon Distribution
inside Proton | (a) 13 pages(LaTeX) + 1 figure ps file(3 pages):compressed, uuencoded
(b) accepted by Phys.Lett.B. (c) some figures are combined and one is
omitted. (d) conclusion part is included into abstract | Phys.Lett. B366 (1996) 293 | 10.1016/0370-2693(95)01315-6 | YUMS 95-014, SNUTP 95-053 | hep-ph | null | The transverse momentum distribution of single vector boson production at
hadron colliders provides useful ways of testing the Standard Model and
searching new physics beyond the Standard Model. We study large $p_{_T}$
hadroproduction of $Z$-boson as a probe of gluon distributions inside proton.
We investigate how to get initial gluon-involving contributions, or how to
subtract quark-quark (or -antiquark) contributions from total cross section. We
also investigated the simultaneous measurement of the rapidity and the
transverse momentum of the produced $Z$ boson, to obtain momentum fractions of
initial partons. And we extracted relevant uncertainties involving in
experimental and theoretical analyses. This large $p_{_T}$ hadroproduction of
$Z$ can be used as constraints on analyses of global parton (gluon and quarks)
distribution functions inside proton.
| [
{
"created": "Fri, 23 Jun 1995 12:51:06 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 1995 06:05:34 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Kim",
"C. S.",
""
],
[
"Lee",
"Jake",
""
]
] | The transverse momentum distribution of single vector boson production at hadron colliders provides useful ways of testing the Standard Model and searching new physics beyond the Standard Model. We study large $p_{_T}$ hadroproduction of $Z$-boson as a probe of gluon distributions inside proton. We investigate how to get initial gluon-involving contributions, or how to subtract quark-quark (or -antiquark) contributions from total cross section. We also investigated the simultaneous measurement of the rapidity and the transverse momentum of the produced $Z$ boson, to obtain momentum fractions of initial partons. And we extracted relevant uncertainties involving in experimental and theoretical analyses. This large $p_{_T}$ hadroproduction of $Z$ can be used as constraints on analyses of global parton (gluon and quarks) distribution functions inside proton. |
0905.2309 | Peter Klimai | E.V. Bugaev, P.A. Klimai | About possible contribution of intrinsic charm component to inclusive
spectra of charmed mesons | 10 pages, 4 figures. Version published in J. Phys. G. | J.Phys.G 37:055004,2010 | 10.1088/0954-3899/37/5/055004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate differential energy spectra ($x_F$-distributions) of charmed
particles produced in proton-nucleus collisions, assuming the existence of
intrinsic heavy quark components in the proton wave function. For the
calculation, the recently proposed factorization scheme is used, based on the
Color Glass Condensate theory and specially suited for predictions of a
production of particles with large rapidities. It is argued that the intrinsic
charm component can, if it exists, dominate in a sum of two components,
intrinsic + extrinsic, of the inclusive spectrum of charmed particles produced
in proton-nucleus collisions at high energies, in the region of medium $x_F$,
$0.15 < x_F < 0.7$, and can give noticeable contribution to atmospheric fluxes
of prompt muons and neutrinos.
| [
{
"created": "Thu, 14 May 2009 11:43:38 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Apr 2010 09:27:17 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Bugaev",
"E. V.",
""
],
[
"Klimai",
"P. A.",
""
]
] | We calculate differential energy spectra ($x_F$-distributions) of charmed particles produced in proton-nucleus collisions, assuming the existence of intrinsic heavy quark components in the proton wave function. For the calculation, the recently proposed factorization scheme is used, based on the Color Glass Condensate theory and specially suited for predictions of a production of particles with large rapidities. It is argued that the intrinsic charm component can, if it exists, dominate in a sum of two components, intrinsic + extrinsic, of the inclusive spectrum of charmed particles produced in proton-nucleus collisions at high energies, in the region of medium $x_F$, $0.15 < x_F < 0.7$, and can give noticeable contribution to atmospheric fluxes of prompt muons and neutrinos. |
1506.00766 | Hua-Xing Chen | Dan Zhou, Hua-Xing Chen, Li-Sheng Geng, Xiang Liu and Shi-Lin Zhu | F-wave heavy-light meson spectroscopy in QCD sum rules and heavy quark
effective theory | 10 pages, 8 figures, 3 tables, accepted by PRD | Phys. Rev. D 92, 114015 (2015) | 10.1103/PhysRevD.92.114015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the F-wave c_bar s heavy meson doublets (2+,3+) and (3+,4+). They
have large orbital excitations L=3, and may be good challenges (tests) for
theoretical studies. To study them we use the method of QCD sum rule in the
framework of heavy quark effective theory. Their masses are predicted to be
m_{(2+,3+)} = (3.45 \pm 0.25, 3.50 \pm 0.26) GeV and m_{(3+,4+)} = (3.20 \pm
0.22, 3.26 \pm 0.23) GeV, with mass splittings Delta m_{(2+,3+)} = m_{3+} -
m_{2+} = 0.046 \pm 0.030 GeV and Delta m_{(3+,4+)} = 0.053 \pm 0.044 GeV,
respectively. We note that this is a pioneering work and these results are
provisional.
| [
{
"created": "Tue, 2 Jun 2015 06:32:39 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Nov 2015 06:51:58 GMT",
"version": "v2"
}
] | 2015-12-14 | [
[
"Zhou",
"Dan",
""
],
[
"Chen",
"Hua-Xing",
""
],
[
"Geng",
"Li-Sheng",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We study the F-wave c_bar s heavy meson doublets (2+,3+) and (3+,4+). They have large orbital excitations L=3, and may be good challenges (tests) for theoretical studies. To study them we use the method of QCD sum rule in the framework of heavy quark effective theory. Their masses are predicted to be m_{(2+,3+)} = (3.45 \pm 0.25, 3.50 \pm 0.26) GeV and m_{(3+,4+)} = (3.20 \pm 0.22, 3.26 \pm 0.23) GeV, with mass splittings Delta m_{(2+,3+)} = m_{3+} - m_{2+} = 0.046 \pm 0.030 GeV and Delta m_{(3+,4+)} = 0.053 \pm 0.044 GeV, respectively. We note that this is a pioneering work and these results are provisional. |
hep-ph/9903386 | Jonathan R. Ellis | John Ellis and N.E. Mavromatos | Comments on CP, T and CPT Violation in Neutral Kaon Decays | 20 pages LaTeX, Contribution to the Festschrift for L.B. Okun, to
appear in a special issue of Physics Reports, eds. V.L. Telegdi and K. Winter | Phys.Rept.320:341-354,1999 | 10.1016/S0370-1573(99)00058-7 | CERN-TH/99-60, OUTP-99-17P | hep-ph hep-ex hep-th | null | We comment on CP, T and CPT violation in the light of interesting new data
from the CPLEAR and KTeV Collaborations on neutral kaon decay asymmetries.
Other recent data from the CPLEAR experiment, constraining possible violations
of CPT and the $\Delta S = \Delta Q$ rule, exclude the possibility that the
semileptonic-decay asymmetry $A_{T}$ measured by CPLEAR could be solely due to
CPT violation, confirming that their data constitute direct evidence for T
violation. The CP-violating asymmetry in $K_L \to e^-e^+\pi^-\pi^+$ recently
measured by the KTeV Collaboration does not by itself provide direct evidence
for T violation, but we use it to place new bounds on CPT violation.
| [
{
"created": "Wed, 17 Mar 1999 16:51:08 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
""
],
[
"Mavromatos",
"N. E.",
""
]
] | We comment on CP, T and CPT violation in the light of interesting new data from the CPLEAR and KTeV Collaborations on neutral kaon decay asymmetries. Other recent data from the CPLEAR experiment, constraining possible violations of CPT and the $\Delta S = \Delta Q$ rule, exclude the possibility that the semileptonic-decay asymmetry $A_{T}$ measured by CPLEAR could be solely due to CPT violation, confirming that their data constitute direct evidence for T violation. The CP-violating asymmetry in $K_L \to e^-e^+\pi^-\pi^+$ recently measured by the KTeV Collaboration does not by itself provide direct evidence for T violation, but we use it to place new bounds on CPT violation. |
1001.2693 | Brent D. Nelson | P. Nath, B.D. Nelson, H. Davoudiasl, B. Dutta, D. Feldman, Z. Liu, T.
Han, P. Langacker, R. Mohapatra, J. Valle, A. Pilaftsis, D. Zerwas, S.
AbdusSalam, C. Adam-Bourdarios, J.A. Aguilar-Saavedra, B. Allanach, B.
Altunkaynak, L.A. Anchordoqui, H. Baer, B. Bajc, O. Buchmueller, M. Carena,
R. Cavanaugh, S. Chang, K. Choi, C. Csaki, S. Dawson, F. de Campos, A. De
Roeck, M. Duhrssen, O.J.P. Eboli, J.R. Ellis, H. Flacher, H. Goldberg, W.
Grimus, U. Haisch, S. Heinemeyer, M. Hirsch, M. Holmes, T. Ibrahim, G.
Isidori, G. Kane, K. Kong, R. Lafaye, G. Landsberg, L. Lavoura, J.S. Lee,
S.J. Lee, M. Lisanti, D. Lust, M.B. Magro, R. Mahbubani, M. Malinsky, F.
Maltoni, S. Morisi, M.M. Muhlleitner, B. Mukhopadhyaya, M. Neubert, K.A.
Olive, G. Perez, P. Fileviez Perez, T. Plehn, E. Ponton, W. Porod, F.
Quevedo, M. Rauch, D. Restrepo, T.G. Rizzo, J.C. Romao, F.J. Ronga, J.
Santiago, J. Schechter, G. Senjanovic, J. Shao, M. Spira, S. Stieberger, Z.
Sullivan, T.M.P. Tait, X. Tata, T.R. Taylor, M. Toharia, J. Wacker, C.E.M.
Wagner, L.-T. Wang, G. Weiglein, D. Zeppenfeld, K. Zurek | The Hunt for New Physics at the Large Hadron Collider | Summary document for international workshop "Beyond the Standard
Model at the LHC" (Pre-SUSY09), Northeastern University, Boston, June 2-4,
2009 | Nucl.Phys.Proc.Suppl.200-202:185-417,2010 | 10.1016/j.nuclphysbps.2010.03.001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Large Hadron Collider presents an unprecedented opportunity to probe the
realm of new physics in the TeV region and shed light on some of the core
unresolved issues of particle physics. These include the nature of electroweak
symmetry breaking, the origin of mass, the possible constituent of cold dark
matter, new sources of CP violation needed to explain the baryon excess in the
universe, the possible existence of extra gauge groups and extra matter, and
importantly the path Nature chooses to resolve the hierarchy problem - is it
supersymmetry or extra dimensions. Many models of new physics beyond the
standard model contain a hidden sector which can be probed at the LHC.
Additionally, the LHC will be a top factory and accurate measurements of the
properties of the top and its rare decays will provide a window to new physics.
Further, the LHC could shed light on the origin of neutralino masses if the new
physics associated with their generation lies in the TeV region. Finally, the
LHC is also a laboratory to test the hypothesis of TeV scale strings and
D-brane models. An overview of these possibilities is presented in the spirit
that it will serve as a companion to the Technical Design Reports (TDRs) by the
particle detector groups ATLAS and CMS to facilitate the test of the new
theoretical ideas at the LHC. Which of these ideas stands the test of the LHC
data will govern the course of particle physics in the subsequent decades.
| [
{
"created": "Thu, 14 Jan 2010 23:03:49 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Nath",
"P.",
""
],
[
"Nelson",
"B. D.",
""
],
[
"Davoudiasl",
"H.",
""
],
[
"Dutta",
"B.",
""
],
[
"Feldman",
"D.",
""
],
[
"Liu",
"Z.",
""
],
[
"Han",
"T.",
""
],
[
"Langacker",
"P.",
""
],
[
"Mohapatra",
"R.",
""
],
[
"Valle",
"J.",
""
],
[
"Pilaftsis",
"A.",
""
],
[
"Zerwas",
"D.",
""
],
[
"AbdusSalam",
"S.",
""
],
[
"Adam-Bourdarios",
"C.",
""
],
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Allanach",
"B.",
""
],
[
"Altunkaynak",
"B.",
""
],
[
"Anchordoqui",
"L. A.",
""
],
[
"Baer",
"H.",
""
],
[
"Bajc",
"B.",
""
],
[
"Buchmueller",
"O.",
""
],
[
"Carena",
"M.",
""
],
[
"Cavanaugh",
"R.",
""
],
[
"Chang",
"S.",
""
],
[
"Choi",
"K.",
""
],
[
"Csaki",
"C.",
""
],
[
"Dawson",
"S.",
""
],
[
"de Campos",
"F.",
""
],
[
"De Roeck",
"A.",
""
],
[
"Duhrssen",
"M.",
""
],
[
"Eboli",
"O. J. P.",
""
],
[
"Ellis",
"J. R.",
""
],
[
"Flacher",
"H.",
""
],
[
"Goldberg",
"H.",
""
],
[
"Grimus",
"W.",
""
],
[
"Haisch",
"U.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Hirsch",
"M.",
""
],
[
"Holmes",
"M.",
""
],
[
"Ibrahim",
"T.",
""
],
[
"Isidori",
"G.",
""
],
[
"Kane",
"G.",
""
],
[
"Kong",
"K.",
""
],
[
"Lafaye",
"R.",
""
],
[
"Landsberg",
"G.",
""
],
[
"Lavoura",
"L.",
""
],
[
"Lee",
"J. S.",
""
],
[
"Lee",
"S. J.",
""
],
[
"Lisanti",
"M.",
""
],
[
"Lust",
"D.",
""
],
[
"Magro",
"M. B.",
""
],
[
"Mahbubani",
"R.",
""
],
[
"Malinsky",
"M.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Morisi",
"S.",
""
],
[
"Muhlleitner",
"M. M.",
""
],
[
"Mukhopadhyaya",
"B.",
""
],
[
"Neubert",
"M.",
""
],
[
"Olive",
"K. A.",
""
],
[
"Perez",
"G.",
""
],
[
"Perez",
"P. Fileviez",
""
],
[
"Plehn",
"T.",
""
],
[
"Ponton",
"E.",
""
],
[
"Porod",
"W.",
""
],
[
"Quevedo",
"F.",
""
],
[
"Rauch",
"M.",
""
],
[
"Restrepo",
"D.",
""
],
[
"Rizzo",
"T. G.",
""
],
[
"Romao",
"J. C.",
""
],
[
"Ronga",
"F. J.",
""
],
[
"Santiago",
"J.",
""
],
[
"Schechter",
"J.",
""
],
[
"Senjanovic",
"G.",
""
],
[
"Shao",
"J.",
""
],
[
"Spira",
"M.",
""
],
[
"Stieberger",
"S.",
""
],
[
"Sullivan",
"Z.",
""
],
[
"Tait",
"T. M. P.",
""
],
[
"Tata",
"X.",
""
],
[
"Taylor",
"T. R.",
""
],
[
"Toharia",
"M.",
""
],
[
"Wacker",
"J.",
""
],
[
"Wagner",
"C. E. M.",
""
],
[
"Wang",
"L. -T.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Zeppenfeld",
"D.",
""
],
[
"Zurek",
"K.",
""
]
] | The Large Hadron Collider presents an unprecedented opportunity to probe the realm of new physics in the TeV region and shed light on some of the core unresolved issues of particle physics. These include the nature of electroweak symmetry breaking, the origin of mass, the possible constituent of cold dark matter, new sources of CP violation needed to explain the baryon excess in the universe, the possible existence of extra gauge groups and extra matter, and importantly the path Nature chooses to resolve the hierarchy problem - is it supersymmetry or extra dimensions. Many models of new physics beyond the standard model contain a hidden sector which can be probed at the LHC. Additionally, the LHC will be a top factory and accurate measurements of the properties of the top and its rare decays will provide a window to new physics. Further, the LHC could shed light on the origin of neutralino masses if the new physics associated with their generation lies in the TeV region. Finally, the LHC is also a laboratory to test the hypothesis of TeV scale strings and D-brane models. An overview of these possibilities is presented in the spirit that it will serve as a companion to the Technical Design Reports (TDRs) by the particle detector groups ATLAS and CMS to facilitate the test of the new theoretical ideas at the LHC. Which of these ideas stands the test of the LHC data will govern the course of particle physics in the subsequent decades. |
1512.02576 | Oliver Witzel | R.C. Brower, A. Hasenfratz, C. Rebbi, E. Weinberg, O. Witzel | Composite Higgs model at a conformal fixed point | Updated and with added references to match published version. 6
pages, 3 figures | Phys. Rev. D 93, 075028 (2016) | 10.1103/PhysRevD.93.075028 | EDINBURGH 2015/31 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to construct a chirally broken model based on the infrared fixed
point of a conformal system by raising the mass of some flavors while keeping
the others massless. In the infrared limit the massive fermions decouple and
the massless fermions break chiral symmetry. The running coupling of this
system "walks" and the energy range of walking can be tuned by the mass of the
heavy flavors. Renormalization group considerations predict that the spectrum
of such a system shows hyperscaling.
We have studied a model with four light and eight heavy flavors coupled to
SU(3) gauge fields and verified the above expectations. We determined the mass
of several hadronic states and found that some of them are in the 2-3 TeV range
if the scale is set by the pseudoscalar decay constant $F_\pi \approx 250$ GeV.
The $0^{++}$ scalar state behaves very differently from the other hadronic
states. In most of our simulations it is nearly degenerate with the pion and we
estimate its mass to be less than half of the vector resonance mass.
| [
{
"created": "Tue, 8 Dec 2015 18:31:06 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2016 12:55:40 GMT",
"version": "v2"
}
] | 2016-04-29 | [
[
"Brower",
"R. C.",
""
],
[
"Hasenfratz",
"A.",
""
],
[
"Rebbi",
"C.",
""
],
[
"Weinberg",
"E.",
""
],
[
"Witzel",
"O.",
""
]
] | We propose to construct a chirally broken model based on the infrared fixed point of a conformal system by raising the mass of some flavors while keeping the others massless. In the infrared limit the massive fermions decouple and the massless fermions break chiral symmetry. The running coupling of this system "walks" and the energy range of walking can be tuned by the mass of the heavy flavors. Renormalization group considerations predict that the spectrum of such a system shows hyperscaling. We have studied a model with four light and eight heavy flavors coupled to SU(3) gauge fields and verified the above expectations. We determined the mass of several hadronic states and found that some of them are in the 2-3 TeV range if the scale is set by the pseudoscalar decay constant $F_\pi \approx 250$ GeV. The $0^{++}$ scalar state behaves very differently from the other hadronic states. In most of our simulations it is nearly degenerate with the pion and we estimate its mass to be less than half of the vector resonance mass. |
1912.09740 | Shinya Matsuzaki | Hiroyuki Ishida and Shinya Matsuzaki | A Walking Dilaton Inflation | 10 pages, 1 figure; references and footnotes added; some discussion
added,version published in PLB | null | 10.1016/j.physletb.2020.135390 | KEK-TH-2181 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an inflationary scenario based on a many-flavor hidden QCD with
eight flavors, which realizes the almost scale-invariant (walking) gauge
dynamics. The theory predicts two types of composite (pseudo) Nambu-Goldstone
bosons, the pions and the lightest scalar (dilaton) associated with the
spontaneous chiral symmetry breaking and its simultaneous violation of the
approximate scale invariance. The dilaton acts as an inflaton, where the
inflaton potential is induced by the nonperturbative-scale anomaly linked with
the underlying theory. The inflaton potential parameters are highly constrained
by the walking nature, which are evaluated by straightforward nonperturbative
analyses including lattice simulations. Due to the pseudo Nambu-Goldstone
boson's natures and the intrinsic property for the chiral symmetry breaking in
the walking gauge dynamics, the inflaton coupled to the pions naturally
undergoes the small field inflation consistently with all the cosmological and
astrophysical constraints presently placed by Planck 2018 data. When the theory
is vector-likely coupled to the standard model in part in a way to realize a
dynamical electroweak symmetry breaking, the reheating temperature is
determined by the pion decays to electroweak gauge bosons. The proposed
inflationary scenario would provide a dynamical origin for the small field
inflation as well as the light pions as a smoking-gun to be probed by future
experiments.
| [
{
"created": "Fri, 20 Dec 2019 10:22:19 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jan 2020 03:50:48 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Mar 2020 04:50:26 GMT",
"version": "v3"
}
] | 2020-03-26 | [
[
"Ishida",
"Hiroyuki",
""
],
[
"Matsuzaki",
"Shinya",
""
]
] | We propose an inflationary scenario based on a many-flavor hidden QCD with eight flavors, which realizes the almost scale-invariant (walking) gauge dynamics. The theory predicts two types of composite (pseudo) Nambu-Goldstone bosons, the pions and the lightest scalar (dilaton) associated with the spontaneous chiral symmetry breaking and its simultaneous violation of the approximate scale invariance. The dilaton acts as an inflaton, where the inflaton potential is induced by the nonperturbative-scale anomaly linked with the underlying theory. The inflaton potential parameters are highly constrained by the walking nature, which are evaluated by straightforward nonperturbative analyses including lattice simulations. Due to the pseudo Nambu-Goldstone boson's natures and the intrinsic property for the chiral symmetry breaking in the walking gauge dynamics, the inflaton coupled to the pions naturally undergoes the small field inflation consistently with all the cosmological and astrophysical constraints presently placed by Planck 2018 data. When the theory is vector-likely coupled to the standard model in part in a way to realize a dynamical electroweak symmetry breaking, the reheating temperature is determined by the pion decays to electroweak gauge bosons. The proposed inflationary scenario would provide a dynamical origin for the small field inflation as well as the light pions as a smoking-gun to be probed by future experiments. |
1803.09846 | Shu-Min Zhao | Shu-Min Zhao, Xue-Qian Li | SUSY Confinement | null | Commun. Theor. Phys. 70 (2018) 175-178 | 10.1088/0253-6102/70/2/175 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In response to the present status that searching for SUSY particles has been
unsuccessful, we propose a bold scenario that SUSY particles are confined
inside hadrons with a required condition of $P_R=1$ in analog to the color
confinement for quarks. The scenario seems to be able to reconcile the
beautiful SUSY theory and non-observation at present experiments. On other
aspects, some loopholes in the proposal emerge and require to be answered in
the future research.
| [
{
"created": "Tue, 27 Mar 2018 02:03:50 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jun 2018 02:55:54 GMT",
"version": "v2"
}
] | 2018-07-24 | [
[
"Zhao",
"Shu-Min",
""
],
[
"Li",
"Xue-Qian",
""
]
] | In response to the present status that searching for SUSY particles has been unsuccessful, we propose a bold scenario that SUSY particles are confined inside hadrons with a required condition of $P_R=1$ in analog to the color confinement for quarks. The scenario seems to be able to reconcile the beautiful SUSY theory and non-observation at present experiments. On other aspects, some loopholes in the proposal emerge and require to be answered in the future research. |
1011.2703 | Eugene Zabrodin | J. Bleibel, L.V. Bravina, E.E. Zabrodin | How many of the scaling trends in $pp$ collisions will be violated at
sqrt{s_NN} = 14 TeV ? - Predictions from Monte Carlo quark-gluon string model | null | Phys. Rev. D 93, 114012 (2016) | 10.1103/PhysRevD.93.114012 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multiplicity, rapidity and transverse momentum distributions of hadrons
produced both in inelastic and nondiffractive $pp$ collisions at energies from
$\sqrt{s} = 200$\,GeV to 14\,TeV are studied within the Monte Carlo quark-gluon
string model (QGSM). Good agreement with the available experimental data up to
$\sqrt{s} = 13$\,TeV is obtained, and predictions are made for the collisions
at top LHC energy $\sqrt{s} = 14$\,TeV. The model indicates that Feynman
scaling and extended longitudinal scaling remain valid in the fragmentation
regions, whereas strong violation of Feynman scaling is observed at
midrapidity. The Koba-Nielsen-Olesen (KNO) scaling in multiplicity
distributions is violated at LHC also. The origin of both maintenance and
violation of the scaling trends is traced to short range correlations of
particles in the strings and interplay between the multistring processes at
ultrarelativistic energies.
| [
{
"created": "Thu, 11 Nov 2010 16:44:21 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2016 15:56:43 GMT",
"version": "v2"
}
] | 2016-06-15 | [
[
"Bleibel",
"J.",
""
],
[
"Bravina",
"L. V.",
""
],
[
"Zabrodin",
"E. E.",
""
]
] | Multiplicity, rapidity and transverse momentum distributions of hadrons produced both in inelastic and nondiffractive $pp$ collisions at energies from $\sqrt{s} = 200$\,GeV to 14\,TeV are studied within the Monte Carlo quark-gluon string model (QGSM). Good agreement with the available experimental data up to $\sqrt{s} = 13$\,TeV is obtained, and predictions are made for the collisions at top LHC energy $\sqrt{s} = 14$\,TeV. The model indicates that Feynman scaling and extended longitudinal scaling remain valid in the fragmentation regions, whereas strong violation of Feynman scaling is observed at midrapidity. The Koba-Nielsen-Olesen (KNO) scaling in multiplicity distributions is violated at LHC also. The origin of both maintenance and violation of the scaling trends is traced to short range correlations of particles in the strings and interplay between the multistring processes at ultrarelativistic energies. |
hep-ph/0209011 | Masashi Wakamatsu | M. Wakamatsu | Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral
quark soliton model (I) -- phenomenological predictions -- | 36 pages, 20 EPS figures. The revised version accepted for
publication in Phys. Rev. D. The title has been changed, and the body of the
paper has been divided into two pieces, i.e.. the present one which discusses
the main phenomenological predictions of the model and the other one which
describes the detailed formulation of the flavor SU(3) chiral quark soliton
model to predict light-flavor quark and antiquark distribution functions in
the nucleon | null | 10.1103/PhysRevD.67.034005 | OU-HEP-416 | hep-ph nucl-th | null | Theoretical predictions are given for the light-flavor sea-quark
distributions including the strange quark ones on the basis of the flavor SU(3)
version of the chiral quark soliton model. Careful account is taken here of the
SU(3) symmetry breaking effects due to the mass difference between the strange
and nonstrange quarks. This effective mass difference $\Delta m_s$ between the
strange and nonstrange quarks is the only one parameter necessary for the
flavor SU(3) generalization of the model. A particular emphasis of study is put
on the {\it light-flavor sea-quark asymmetry} as exemplified by the observables
$\bar{d} (x) - \bar{u} (x), \bar{d} (x) / \bar{u} (x), \Delta \bar{u} (x) -
\Delta \bar{d} (x)$ as well as on the {\it particle-antiparticle asymmetry} of
the strange quark distributions represented by $s (x) - \bar{s} (x), s (x) /
\bar{s} (x), \Delta s (x) - \Delta \bar{s} (x)$ etc. As for the unpolarized
sea-quark distributions, the predictions of the model seem qualitatively
consistent with the available phenomenological information provided by the NMC
data for $\bar{d} (x) - \bar{u} (x)$, the E866 data for $\bar{d} (x) / \bar{u}
(x)$, the CCFR data and Barone et al.'s fit for $s (x) / \bar{s} (x)$ etc. The
model is shown to give several unique predictions also for the spin-dependent
sea-quark distribution, such that $\Delta s (x) \ll \Delta \bar{s}(x) \lesssim
0$ and $\Delta \bar{d}(x) < 0 < \Delta \bar{u}(x)$, although the verification
of these predictions must await more elaborate experimental investigations in
the near future.
| [
{
"created": "Mon, 2 Sep 2002 03:39:13 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Dec 2002 05:29:43 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Wakamatsu",
"M.",
""
]
] | Theoretical predictions are given for the light-flavor sea-quark distributions including the strange quark ones on the basis of the flavor SU(3) version of the chiral quark soliton model. Careful account is taken here of the SU(3) symmetry breaking effects due to the mass difference between the strange and nonstrange quarks. This effective mass difference $\Delta m_s$ between the strange and nonstrange quarks is the only one parameter necessary for the flavor SU(3) generalization of the model. A particular emphasis of study is put on the {\it light-flavor sea-quark asymmetry} as exemplified by the observables $\bar{d} (x) - \bar{u} (x), \bar{d} (x) / \bar{u} (x), \Delta \bar{u} (x) - \Delta \bar{d} (x)$ as well as on the {\it particle-antiparticle asymmetry} of the strange quark distributions represented by $s (x) - \bar{s} (x), s (x) / \bar{s} (x), \Delta s (x) - \Delta \bar{s} (x)$ etc. As for the unpolarized sea-quark distributions, the predictions of the model seem qualitatively consistent with the available phenomenological information provided by the NMC data for $\bar{d} (x) - \bar{u} (x)$, the E866 data for $\bar{d} (x) / \bar{u} (x)$, the CCFR data and Barone et al.'s fit for $s (x) / \bar{s} (x)$ etc. The model is shown to give several unique predictions also for the spin-dependent sea-quark distribution, such that $\Delta s (x) \ll \Delta \bar{s}(x) \lesssim 0$ and $\Delta \bar{d}(x) < 0 < \Delta \bar{u}(x)$, although the verification of these predictions must await more elaborate experimental investigations in the near future. |
hep-ph/9504336 | Jeff Forshaw | J.R. Forshaw R.G. Roberts R.S. Thorne (Rutherford Appleton Lab) | Analytic Approach to Small-X Structure Functions | 15 pages Latex + 5 figures which are compressed as a uuencoded file
(Physics Letters B -- to appear) | Phys.Lett.B356:79-88,1995 | 10.1016/0370-2693(95)00812-Y | RAL-95-035 | hep-ph | null | We present a method for the analytic solution of small $x$ structure
functions. The essential small $x$ logarithms are summed to all orders in the
anomalous dimensions and coefficient functions. Although we work at leading
logarithmic accuracy, the method is general enough to allow the systematic
inclusion of sub-leading logarithms. Results and predictions are presented for
the gluon density, and the structure functions $F_2(x,Q^2)$ and $F_L(x,Q^2)$.
We find that corrections to the simple double logarithmic calculation are
important in the HERA range and obtain good fits to all available data.
| [
{
"created": "Wed, 19 Apr 1995 13:19:07 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 1995 17:41:54 GMT",
"version": "v2"
}
] | 2010-03-25 | [
[
"Thorne",
"J. R. Forshaw R. G. Roberts R. S.",
"",
"Rutherford Appleton Lab"
]
] | We present a method for the analytic solution of small $x$ structure functions. The essential small $x$ logarithms are summed to all orders in the anomalous dimensions and coefficient functions. Although we work at leading logarithmic accuracy, the method is general enough to allow the systematic inclusion of sub-leading logarithms. Results and predictions are presented for the gluon density, and the structure functions $F_2(x,Q^2)$ and $F_L(x,Q^2)$. We find that corrections to the simple double logarithmic calculation are important in the HERA range and obtain good fits to all available data. |
2007.13736 | Alexander Kartavtsev | A. Kartavtsev | Accounting for the Heisenberg and Pauli principles in the kinetic
approach to neutrino oscillations | 35 pages, 4 figures, minor refinements in the main text, two
appendices added | JHEP11(2020)135 | 10.1007/JHEP11(2020)135 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While oscillations of solar neutrinos are usually studied using the
single-particle quantum-mechanical approach, flavor conversions of supernovae
neutrinos are typically analyzed using the kinetic equation for the matrix of
densities due to the necessity of including also the scattering processes.
Using the Wigner formulation of quantum mechanics we show the equivalence of
the quantum-mechanical and kinetic approaches in the limit of collisionless
neutrino propagation (in a background medium). Based on this observation we
also argue that solutions of the kinetic equation account for the Heisenberg
uncertainty principle and the related effect of wave packet separation (for
single neutrinos), as well as the Pauli exclusion principle, if the initial
conditions are consistent with these fundamental quantum principles. Such
initial conditions can be constructed e.g. by identifying the matrix of
densities with the (reduced) single-particle Wigner function computed using
initial conditions for the neutrino wave function. Hence the neutrino momentum
uncertainty is an integral part of the initial conditions for the matrix of
densities, that may have an impact on the phenomenology of supernovae neutrinos
via the effect of wave packet separation.
| [
{
"created": "Sun, 26 Jul 2020 13:22:00 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2020 14:40:23 GMT",
"version": "v2"
}
] | 2020-11-26 | [
[
"Kartavtsev",
"A.",
""
]
] | While oscillations of solar neutrinos are usually studied using the single-particle quantum-mechanical approach, flavor conversions of supernovae neutrinos are typically analyzed using the kinetic equation for the matrix of densities due to the necessity of including also the scattering processes. Using the Wigner formulation of quantum mechanics we show the equivalence of the quantum-mechanical and kinetic approaches in the limit of collisionless neutrino propagation (in a background medium). Based on this observation we also argue that solutions of the kinetic equation account for the Heisenberg uncertainty principle and the related effect of wave packet separation (for single neutrinos), as well as the Pauli exclusion principle, if the initial conditions are consistent with these fundamental quantum principles. Such initial conditions can be constructed e.g. by identifying the matrix of densities with the (reduced) single-particle Wigner function computed using initial conditions for the neutrino wave function. Hence the neutrino momentum uncertainty is an integral part of the initial conditions for the matrix of densities, that may have an impact on the phenomenology of supernovae neutrinos via the effect of wave packet separation. |
hep-ph/9604244 | J. W. F. Valle | J. C. Romao (IST, Lisbon), F. de Campos (IFT, Unesp, Brazil), M. A.
Garcia-Jareno, M. B. Magro and J. W. F. Valle (IFIC, U. Valencia) | LEP Sensitivities to Spontaneous R-Parity Violating Signals | 28 pages, LaTex file + 6 figures, all compressed by uufiles, also
available from anonymous ftp at
ftp://neutrinos.uv.es/pub/papers/ps/rpv_lep1.uu | Nucl.Phys.B482:3-23,1996 | 10.1016/S0550-3213(96)00494-4 | FTUV/96-06; IFIC/96-07 | hep-ph | null | We illustrate the sensitivities of LEP experiments to leptonic signals
associated to models where supersymmetry (SUSY) is realized with spontaneous
breaking of R-parity. We focus on missing transverse momentum plus acoplanar
muon events arising from lightest neutralino single production $\chi \nu$ as
well as pair production $\chi \chi$, followed by $\chi$ decays, where $\chi$
denotes the lightest neutralino. We show that the integrated luminosity
achieved at LEP already starts probing the basic parameters of the theory. We
discuss the significance of these constraints for the simplest spontaneous
R-parity breaking models and their relevance for future searches of SUSY
particles.
| [
{
"created": "Thu, 4 Apr 1996 10:12:48 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Romao",
"J. C.",
"",
"IST, Lisbon"
],
[
"de Campos",
"F.",
"",
"IFT, Unesp, Brazil"
],
[
"Garcia-Jareno",
"M. A.",
"",
"IFIC, U. Valencia"
],
[
"Magro",
"M. B.",
"",
"IFIC, U. Valencia"
],
[
"Valle",
"J. W. F.",
"",
"IFIC, U. Valencia"
]
] | We illustrate the sensitivities of LEP experiments to leptonic signals associated to models where supersymmetry (SUSY) is realized with spontaneous breaking of R-parity. We focus on missing transverse momentum plus acoplanar muon events arising from lightest neutralino single production $\chi \nu$ as well as pair production $\chi \chi$, followed by $\chi$ decays, where $\chi$ denotes the lightest neutralino. We show that the integrated luminosity achieved at LEP already starts probing the basic parameters of the theory. We discuss the significance of these constraints for the simplest spontaneous R-parity breaking models and their relevance for future searches of SUSY particles. |
1610.05144 | Edward Shuryak | Edward Shuryak and Ismail Zahed | CP violation during the electroweak sphaleron transitions | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a specific semiclassical background field, the so called pure
gauge sphaleron explosion, to evaluate the magnitude of the CP violation
stemming from the standard phase of the CKM matrix. We use it to evaluate the
matrix elements of some next-to-leading order effective CP-violating operators
suggested in the literature. We also derive the scale dependence of the
corresponding coefficients. Finally, we discuss the expected magnitude of the
CP violation in the cold electroweak scenario.
| [
{
"created": "Mon, 17 Oct 2016 14:41:53 GMT",
"version": "v1"
}
] | 2016-10-18 | [
[
"Shuryak",
"Edward",
""
],
[
"Zahed",
"Ismail",
""
]
] | We suggest a specific semiclassical background field, the so called pure gauge sphaleron explosion, to evaluate the magnitude of the CP violation stemming from the standard phase of the CKM matrix. We use it to evaluate the matrix elements of some next-to-leading order effective CP-violating operators suggested in the literature. We also derive the scale dependence of the corresponding coefficients. Finally, we discuss the expected magnitude of the CP violation in the cold electroweak scenario. |
hep-ph/0009092 | Hiroshi Nunokawa | Hiroshi Nunokawa | Status of the solutions to neutrino anomalies based on non-standard
neutrino interactions | 6 pages with 8 postscript figures, uses espcrc2.sty, Talk presented
at ``NuFact'00'' workshop, Monterey, CA, USA, May 22-26, 2000 | Nucl.Instrum.Meth. A472 (2000) 443-450 | 10.1016/S0168-9002(01)01289-X | null | hep-ph | null | We review the status of the solutions to neutrino anomalies by
flavor-changing as well as flavor-diagonal neutrino interactions. While it is
difficult to explain the atmospheric neutrino data the solar neutrino data can
be well accounted for by the massless neutrino oscillation induced by such
non-standard neutrino interactions. We also discuss the possibility to test
such kind of interactions by the future neutrino oscillation experiments at
neutrino factories.
| [
{
"created": "Thu, 7 Sep 2000 22:00:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Nunokawa",
"Hiroshi",
""
]
] | We review the status of the solutions to neutrino anomalies by flavor-changing as well as flavor-diagonal neutrino interactions. While it is difficult to explain the atmospheric neutrino data the solar neutrino data can be well accounted for by the massless neutrino oscillation induced by such non-standard neutrino interactions. We also discuss the possibility to test such kind of interactions by the future neutrino oscillation experiments at neutrino factories. |
hep-ph/0503192 | Paulo Rodrigues da Silva | Alex G. Dias, C. A. de S. Pires, V. Pleitez, P. S. Rodrigues da Silva | Dynamically Induced Spontaneous Symmetry Breaking in 3-3-1 Models | 12 pages, typos corrected, improved text, conclusions unchanged | Phys.Lett. B621 (2005) 151-159 | 10.1016/j.physletb.2005.06.048 | IFT-P.010/2005 | hep-ph | null | We show that in SU(3)_C X SU(3)_L X U(1)_N (3-3-1) models embedded with a
singlet scalar playing the role of the axion, after imposing scale invariance,
dynamical symmetry breaking of Peccei-Quinn symmetry occurs through the
one-loop effective potential for the singlet field. We, then, analyze the
structure of spontaneous symmetry breaking by studying the new scalar potential
for the model, and verify that electroweak symmetry breaking is tightly
connected to the 3-3-1 breaking by the strong constraints among their vacuum
expectation values. This offers a valuable guide to write down the correct
pattern of symmetry breaking for multi-scalar theories. We also obtained that
the accompanying massive pseudo-scalar, instead of acquiring mass of order of
Peccei-Quinn scale as we would expect, develops a mass at a much lower scale, a
consequence solely of the dynamical breaking.
| [
{
"created": "Fri, 18 Mar 2005 20:05:44 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2005 17:48:01 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Dias",
"Alex G.",
""
],
[
"Pires",
"C. A. de S.",
""
],
[
"Pleitez",
"V.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
]
] | We show that in SU(3)_C X SU(3)_L X U(1)_N (3-3-1) models embedded with a singlet scalar playing the role of the axion, after imposing scale invariance, dynamical symmetry breaking of Peccei-Quinn symmetry occurs through the one-loop effective potential for the singlet field. We, then, analyze the structure of spontaneous symmetry breaking by studying the new scalar potential for the model, and verify that electroweak symmetry breaking is tightly connected to the 3-3-1 breaking by the strong constraints among their vacuum expectation values. This offers a valuable guide to write down the correct pattern of symmetry breaking for multi-scalar theories. We also obtained that the accompanying massive pseudo-scalar, instead of acquiring mass of order of Peccei-Quinn scale as we would expect, develops a mass at a much lower scale, a consequence solely of the dynamical breaking. |
hep-ph/0006067 | William H. Kinney | Martina Brisudova and William H. Kinney (Univ. of Florida) | Back reaction of a long range force on a Friedmann-Robertson-Walker
background | 14 pages, 6 color Postscript figures, LaTeX | Phys.Rev. D62 (2000) 103516 | 10.1103/PhysRevD.62.103516 | null | hep-ph astro-ph | null | It is possible that there may exist long-range forces in addition to gravity.
In this paper we construct a simple model for such a force based on exchange of
a massless scalar field and analyze its effect on the evolution of a
homogeneous Friedmann-Robertson-Walker cosmology. The presence of such an
interaction leads to an equation of state characterized by positive pressure
and to resonant particle production similar to that observed in preheating
scenarios.
| [
{
"created": "Wed, 7 Jun 2000 20:01:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Brisudova",
"Martina",
"",
"Univ. of Florida"
],
[
"Kinney",
"William H.",
"",
"Univ. of Florida"
]
] | It is possible that there may exist long-range forces in addition to gravity. In this paper we construct a simple model for such a force based on exchange of a massless scalar field and analyze its effect on the evolution of a homogeneous Friedmann-Robertson-Walker cosmology. The presence of such an interaction leads to an equation of state characterized by positive pressure and to resonant particle production similar to that observed in preheating scenarios. |
0804.4711 | Thomas D. Cohen | Thomas D. Cohen, Juan A. Ponciano and Norberto N. Scoccola | On Skyrmion semiclassical quantization in the presence of an isospin
chemical potential | 12 pages, 4 figures | Phys.Rev.D78:034040,2008 | 10.1103/PhysRevD.78.034040 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The semiclassical description of Skyrmions at small isospin chemical
potential $\mu_I$ is carefully analyzed. We show that when the calculation of
the energy of a nucleon is performed using the straightforward generalization
of the vacuum sector techniques ($\mu_I=0$), together with the "natural"
assumption $\mu_I = {\cal O} (N_c^0)$, the proton and neutron masses are
nonlinear in $\mu_I$ in the regime $|\mu_I| < m_\pi$. Although these
nonlinearities turn out to be numerically quite small, such a result fails to
strictly agree with the very robust prediction that for those values of $\mui$
the energy excitations above the vacuum are linear in $\mu_I$. The resolution
of this paradox is achieved by studying the realization of the large $N_c$
limit of $QCD$ in the Skyrme model at finite $\mui$. This is done in a
simplified context devoid of the technical complications present in the Skyrme
model but which fully displays the general scaling behavior with $N_c$. The
analysis shows that the paradoxical result appears as a symptom of using the
semi-classical approach beyond its regime of validity and that, at a formal
level, the standard methods for dealing with the Skyrme model are only strictly
justified for states of high isospin $I \sim N_c$.
| [
{
"created": "Wed, 30 Apr 2008 00:27:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cohen",
"Thomas D.",
""
],
[
"Ponciano",
"Juan A.",
""
],
[
"Scoccola",
"Norberto N.",
""
]
] | The semiclassical description of Skyrmions at small isospin chemical potential $\mu_I$ is carefully analyzed. We show that when the calculation of the energy of a nucleon is performed using the straightforward generalization of the vacuum sector techniques ($\mu_I=0$), together with the "natural" assumption $\mu_I = {\cal O} (N_c^0)$, the proton and neutron masses are nonlinear in $\mu_I$ in the regime $|\mu_I| < m_\pi$. Although these nonlinearities turn out to be numerically quite small, such a result fails to strictly agree with the very robust prediction that for those values of $\mui$ the energy excitations above the vacuum are linear in $\mu_I$. The resolution of this paradox is achieved by studying the realization of the large $N_c$ limit of $QCD$ in the Skyrme model at finite $\mui$. This is done in a simplified context devoid of the technical complications present in the Skyrme model but which fully displays the general scaling behavior with $N_c$. The analysis shows that the paradoxical result appears as a symptom of using the semi-classical approach beyond its regime of validity and that, at a formal level, the standard methods for dealing with the Skyrme model are only strictly justified for states of high isospin $I \sim N_c$. |
2210.09780 | Boris Altshuler | Boris Altshuler | Quark mixing angles vs quark masses: potential approach | 13 pages | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | It is shown that phenomenologically favorable expressions of quark mixing
angles through the ratios of current quark masses may be derived as stable
points of certain 4-th power in CKM matrix flavor-invariant potentials built
with traces of 3x3 quark up and down mass matrices.
| [
{
"created": "Tue, 18 Oct 2022 11:47:19 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2022 08:51:37 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Dec 2022 17:10:04 GMT",
"version": "v3"
}
] | 2022-12-13 | [
[
"Altshuler",
"Boris",
""
]
] | It is shown that phenomenologically favorable expressions of quark mixing angles through the ratios of current quark masses may be derived as stable points of certain 4-th power in CKM matrix flavor-invariant potentials built with traces of 3x3 quark up and down mass matrices. |
hep-ph/9801206 | Han Meng | Jiang Yi, Zhou Mian-Lai, Ma Wen-Gan, Han Liang, Zhou Hong and Han Meng
(USTC P.R.China) | Probing flavor changing interactions in photon-photon collisions | 22 pages, LaTeX, including 5 figures in eps files | Phys.Rev.D57:4343-4351,1998 | 10.1103/PhysRevD.57.4343 | null | hep-ph | null | We examine the subprocess $\gamma\gamma \to t\bar{c}+\bar{t}c$ at
electron-positron colliders in the two-Higgs-doublet model with flavor-changing
scalar couplings, where all the one-loop contribuions are considered, and the
results are applicable to the whole mass range of the weakly coupled Higgs
bosons. Because of the heavy top quark mass, this process is important in
probing the flavor-changing top-charm-scalar vertex and could be detectable at
the Next Linear Collider, if the values of the parameters are favorable. The
results show that this process is more promising than the direct $e^{+} e^{-}$
process for discovering flavor changing scalar interactions.
| [
{
"created": "Fri, 2 Jan 1998 02:20:57 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Yi",
"Jiang",
"",
"USTC P.R.China"
],
[
"Mian-Lai",
"Zhou",
"",
"USTC P.R.China"
],
[
"Wen-Gan",
"Ma",
"",
"USTC P.R.China"
],
[
"Liang",
"Han",
"",
"USTC P.R.China"
],
[
"Hong",
"Zhou",
"",
"USTC P.R.China"
],
[
"Meng",
"Han",
"",
"USTC P.R.China"
]
] | We examine the subprocess $\gamma\gamma \to t\bar{c}+\bar{t}c$ at electron-positron colliders in the two-Higgs-doublet model with flavor-changing scalar couplings, where all the one-loop contribuions are considered, and the results are applicable to the whole mass range of the weakly coupled Higgs bosons. Because of the heavy top quark mass, this process is important in probing the flavor-changing top-charm-scalar vertex and could be detectable at the Next Linear Collider, if the values of the parameters are favorable. The results show that this process is more promising than the direct $e^{+} e^{-}$ process for discovering flavor changing scalar interactions. |
hep-ph/9308249 | Arthur Weldon | H. Arthur Weldon | Cancellation of Infrared Divergences in Thermal QED | 6 pages, (Talk presented at Quark Matter '93) | Nucl.Phys. A566 (1994) 581c-584c | 10.1016/0375-9474(94)90698-X | null | hep-ph | null | As a preliminary step, the radiation produced by a classical charged current
coupled to a quantized $A_{\mu}$ is solved. To each order in $\alpha$, all
infrared divergences cancel between the virtual $\gamma$'s and the real
$\gamma$'s absorbed from the plasma or emitted into the plasma. When all orders
of perturbation theory are summed, the finite answer predicts a suppression of
radiation with $\omega< \alpha T$. The analysis of QED then consists of two
steps. First, a general probability at $T\neq 0$ is organized so that all the
virtual $e^{\pm},\gamma$ are in the amplitudes and all the real
$e^{\pm},\gamma$ are in the phase space integrations. Next, the cancellations
of IR divergences between virtual and real are demonstrated.
| [
{
"created": "Mon, 9 Aug 1993 20:45:39 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Weldon",
"H. Arthur",
""
]
] | As a preliminary step, the radiation produced by a classical charged current coupled to a quantized $A_{\mu}$ is solved. To each order in $\alpha$, all infrared divergences cancel between the virtual $\gamma$'s and the real $\gamma$'s absorbed from the plasma or emitted into the plasma. When all orders of perturbation theory are summed, the finite answer predicts a suppression of radiation with $\omega< \alpha T$. The analysis of QED then consists of two steps. First, a general probability at $T\neq 0$ is organized so that all the virtual $e^{\pm},\gamma$ are in the amplitudes and all the real $e^{\pm},\gamma$ are in the phase space integrations. Next, the cancellations of IR divergences between virtual and real are demonstrated. |
hep-ph/9607422 | Konstantin Chetyrkin | K.G. Chetyrkin, J.H. K\"uhn, M. Steinhauser | Higher Moments of Heavy Quark Vacuum Polarization | 9 pages, LaTeX, no figures, sprocl.sty provided (To appear in the
Proceedings of the Second Workshop on Continuous Advances in QCD,
Minneapolis, U.S.A., March 1996). Postscript also available at
ftp://www-ttp.physik.uni-karlsruhe.de/ttp96-22/ttp96-22.ps or at
http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ | null | 10.1016/S0920-5632(96)90008-0 | TTP96-22, MPI/PhT/96-66 | hep-ph | null | We present analytical calculation of the first seven moments of the heavy
quark vacuum polarization function in the three-loop order. The obtained
results are compared against the asymptotic formulas following from the
threshold singularities. We also discuss the $\mu$ dependence of the moments
within the BLM procedure.
| [
{
"created": "Thu, 25 Jul 1996 07:44:22 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Kühn",
"J. H.",
""
],
[
"Steinhauser",
"M.",
""
]
] | We present analytical calculation of the first seven moments of the heavy quark vacuum polarization function in the three-loop order. The obtained results are compared against the asymptotic formulas following from the threshold singularities. We also discuss the $\mu$ dependence of the moments within the BLM procedure. |
hep-ph/9906256 | Sorin Codoban | S. Codoban, D.I. Kazakov | Approximate Analytic Solutions of RG Equations for Yukawa and Soft
Couplings in SUSY Models | 14 pages, LaTex, 4 eps figures, some comments added, final version | Eur.Phys.J.C13:671-679,2000 | 10.1007/s100520050726 | null | hep-ph | null | We present simple analytical formulae which describe solutions of the RG
equations for Yukawa couplings in SUSY gauge theories with the accuracy of a
few per cent. Performing the Grassmannian expansion in these solutions one
finds those for all the soft couplings and masses. The solutions clearly
exhibit the fixed point behaviour which can be calculated analytically. A
comparison with numerical solutions is demonstrated.
| [
{
"created": "Fri, 4 Jun 1999 13:41:50 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jun 1999 13:01:14 GMT",
"version": "v2"
},
{
"created": "Wed, 31 May 2000 11:18:49 GMT",
"version": "v3"
}
] | 2011-09-13 | [
[
"Codoban",
"S.",
""
],
[
"Kazakov",
"D. I.",
""
]
] | We present simple analytical formulae which describe solutions of the RG equations for Yukawa couplings in SUSY gauge theories with the accuracy of a few per cent. Performing the Grassmannian expansion in these solutions one finds those for all the soft couplings and masses. The solutions clearly exhibit the fixed point behaviour which can be calculated analytically. A comparison with numerical solutions is demonstrated. |
1103.4387 | Hisakazu Minakata | Katsuhiro Asano, Hisakazu Minakata | Large-Theta(13) Perturbation Theory of Neutrino Oscillation for
Long-Baseline Experiments | Fig.2 added, 23 pages. Matches to the published version | JHEP 1106:022,2011 | 10.1007/JHEP06(2011)022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Cervera et al. formula, the best known approximate formula of neutrino
oscillation probability for long-baseline experiments, can be regarded as a
second-order perturbative formula with small expansion parameter epsilon \equiv
Delta m^2_{21} / Delta m^2_{31} \simeq 0.03 under the assumption s_{13} \simeq
epsilon. If theta_{13} is large, as suggested by a candidate nu_{e} event at
T2K as well as the recent global analyses, higher order corrections of s_{13}
to the formula would be needed for better accuracy. We compute the corrections
systematically by formulating a perturbative framework by taking theta_{13} as
s_{13} \sim \sqrt{epsilon} \simeq 0.18, which guarantees its validity in a wide
range of theta_{13} below the Chooz limit. We show on general ground that the
correction terms must be of order epsilon^2. Yet, they nicely fill the mismatch
between the approximate and the exact formulas at low energies and relatively
long baselines. General theorems are derived which serve for better
understanding of delta-dependence of the oscillation probability. Some
interesting implications of the large theta_{13} hypothesis are discussed.
| [
{
"created": "Tue, 22 Mar 2011 21:28:03 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2011 09:43:11 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jun 2011 23:04:20 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Asano",
"Katsuhiro",
""
],
[
"Minakata",
"Hisakazu",
""
]
] | The Cervera et al. formula, the best known approximate formula of neutrino oscillation probability for long-baseline experiments, can be regarded as a second-order perturbative formula with small expansion parameter epsilon \equiv Delta m^2_{21} / Delta m^2_{31} \simeq 0.03 under the assumption s_{13} \simeq epsilon. If theta_{13} is large, as suggested by a candidate nu_{e} event at T2K as well as the recent global analyses, higher order corrections of s_{13} to the formula would be needed for better accuracy. We compute the corrections systematically by formulating a perturbative framework by taking theta_{13} as s_{13} \sim \sqrt{epsilon} \simeq 0.18, which guarantees its validity in a wide range of theta_{13} below the Chooz limit. We show on general ground that the correction terms must be of order epsilon^2. Yet, they nicely fill the mismatch between the approximate and the exact formulas at low energies and relatively long baselines. General theorems are derived which serve for better understanding of delta-dependence of the oscillation probability. Some interesting implications of the large theta_{13} hypothesis are discussed. |
hep-ph/9406205 | J. Wudka | Jose Wudka | Electroweak effective lagrangians | 89 pages | Int.J.Mod.Phys. A9 (1994) 2301-2362 | 10.1142/S0217751X94000959 | UCRHEP-T121 | hep-ph | null | In this paper I review several aspects of the use of effective lagrangians in
(mainly) electroweak physics. The conditions under which this approach is
reliable and useful, as well as the limitations of the formalism are detailed.
Various applications are also presented.
| [
{
"created": "Wed, 1 Jun 1994 17:52:21 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Wudka",
"Jose",
""
]
] | In this paper I review several aspects of the use of effective lagrangians in (mainly) electroweak physics. The conditions under which this approach is reliable and useful, as well as the limitations of the formalism are detailed. Various applications are also presented. |
2105.04530 | Bin Yan | Bin Yan | Determining Higgs boson width at electron-positron colliders | 8 pages, 7 figures, the published version in PLB | null | 10.1016/j.physletb.2021.136709 | LA-UR-21-24315 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Probing Higgs width $\Gamma_h$ is critical to test the Higgs properties. In
this work we propose to measure $\Gamma_h$ at the $e^+e^-$ collider with a
model-independent analysis under the Standard Model Effective Field Theory
framework. We demonstrate that making use of the cross section measurements
from $e^+e^-\to Zh$, $e^+e^-\to \nu_e\bar{\nu}_eh$ production and Higgs decay
branching ratios $h\to WW^*/ZZ^*/\gamma\gamma$, one could determine $\Gamma_h$
at a percentage level with a center of mass energy $\sqrt{s}=250$ and 350 GeV
and integrated luminosity $5~{\rm ab}^{-1}$. This conclusion would not depend
on the assumption of the fermion Yukawa interactions. We further apply this
result to constrain the fermion Yukawa couplings and it shows that the
couplings could be well constrained.
| [
{
"created": "Mon, 10 May 2021 17:33:04 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 2021 15:58:30 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Yan",
"Bin",
""
]
] | Probing Higgs width $\Gamma_h$ is critical to test the Higgs properties. In this work we propose to measure $\Gamma_h$ at the $e^+e^-$ collider with a model-independent analysis under the Standard Model Effective Field Theory framework. We demonstrate that making use of the cross section measurements from $e^+e^-\to Zh$, $e^+e^-\to \nu_e\bar{\nu}_eh$ production and Higgs decay branching ratios $h\to WW^*/ZZ^*/\gamma\gamma$, one could determine $\Gamma_h$ at a percentage level with a center of mass energy $\sqrt{s}=250$ and 350 GeV and integrated luminosity $5~{\rm ab}^{-1}$. This conclusion would not depend on the assumption of the fermion Yukawa interactions. We further apply this result to constrain the fermion Yukawa couplings and it shows that the couplings could be well constrained. |
hep-ph/9512369 | Bernd Krause | Andrzej Czarnecki, Bernd Krause, and William J. Marciano | Electroweak corrections to the muon anomalous magnetic moment | Revtex, 10 pages. Corrected version, submitted to Phys. Rev. Lett.
Two-loop electroweak corrections to anomalous magnetic moments of electron
and tau are included | Phys.Rev.Lett.76:3267-3270,1996 | 10.1103/PhysRevLett.76.3267 | TTP95-34 | hep-ph | null | The bosonic two-loop electroweak radiative corrections to the muon's
anomalous magnetic moment, $a_\mu\equiv (g_\mu-2)/2$, are presented. We find
$\Delta a_\mu^{\rm EW}({\rm 2\,loop\, bosonic})/ a_\mu^{\rm EW}({\rm
1\,loop})\approx {\alpha\over \pi}\left(-3.6 \ln\left({M_W^2\over
m_\mu^2}\right) +0.10 \right)\approx -0.11$ for $M_{\rm Higgs}\approx 250$ GeV.
Combining that result with our previous two-loop fermionic calculation, we
obtain an overall 22.6\% reduction in $a_\mu^{\rm EW}$ from $195\times
10^{-11}$ to $151(4)\times 10^{-11}$. Implications for the full standard model
prediction and an upcoming high precision measurement of $a_\mu$ are briefly
discussed. We also give the two-loop electroweak corrections to the anomalous
magnetic moments of electron and tau lepton; they result in a reduction of the
one-loop estimates by 35\% and 15\%, respectively.
| [
{
"created": "Wed, 20 Dec 1995 00:16:31 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 1995 15:34:54 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Mar 1996 17:43:31 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Czarnecki",
"Andrzej",
""
],
[
"Krause",
"Bernd",
""
],
[
"Marciano",
"William J.",
""
]
] | The bosonic two-loop electroweak radiative corrections to the muon's anomalous magnetic moment, $a_\mu\equiv (g_\mu-2)/2$, are presented. We find $\Delta a_\mu^{\rm EW}({\rm 2\,loop\, bosonic})/ a_\mu^{\rm EW}({\rm 1\,loop})\approx {\alpha\over \pi}\left(-3.6 \ln\left({M_W^2\over m_\mu^2}\right) +0.10 \right)\approx -0.11$ for $M_{\rm Higgs}\approx 250$ GeV. Combining that result with our previous two-loop fermionic calculation, we obtain an overall 22.6\% reduction in $a_\mu^{\rm EW}$ from $195\times 10^{-11}$ to $151(4)\times 10^{-11}$. Implications for the full standard model prediction and an upcoming high precision measurement of $a_\mu$ are briefly discussed. We also give the two-loop electroweak corrections to the anomalous magnetic moments of electron and tau lepton; they result in a reduction of the one-loop estimates by 35\% and 15\%, respectively. |
2310.16036 | Artem Roenko | Victor V. Braguta, Maxim N. Chernodub, Ilya E. Kudrov, Artem A.
Roenko, Dmitrii A. Sychev | Negative Barnett effect, negative moment of inertia of gluon plasma and
thermal evaporation of chromomagnetic condensate | 11 pages, 3 figures; acknowledgements added; discussion added;
version accepted for publication in PRD | Phys. Rev. D 110, 014511 (2024) | 10.1103/PhysRevD.110.014511 | null | hep-ph hep-lat hep-th | http://creativecommons.org/licenses/by/4.0/ | We discuss the negativity of the moment of inertia of (quark-)gluon plasma in
a window of "supervortical" range of temperatures above the deconfining phase
transition, $T \simeq (1\dots 1.5) T_c $ found recently in numerical Monte
Carlo simulations by two independent methods. In our work, we confirm
numerically that the origin of this effect is rooted in the thermal evaporation
of the non-perturbative chromomagnetic condensate. We argue that the negative
moment of inertia of gluon plasma indicates the presence of a novel effect, the
negative spin-vortical coupling for gluons resulting in a negative gluonic
Barnett effect: the spin polarization of gluons exceeds the total angular
momentum of rotating plasma, thus forcing the orbital angular momentum to take
negative values in the supervortical range of temperatures.
| [
{
"created": "Tue, 24 Oct 2023 17:50:51 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2024 16:57:49 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jul 2024 08:37:46 GMT",
"version": "v3"
}
] | 2024-08-01 | [
[
"Braguta",
"Victor V.",
""
],
[
"Chernodub",
"Maxim N.",
""
],
[
"Kudrov",
"Ilya E.",
""
],
[
"Roenko",
"Artem A.",
""
],
[
"Sychev",
"Dmitrii A.",
""
]
] | We discuss the negativity of the moment of inertia of (quark-)gluon plasma in a window of "supervortical" range of temperatures above the deconfining phase transition, $T \simeq (1\dots 1.5) T_c $ found recently in numerical Monte Carlo simulations by two independent methods. In our work, we confirm numerically that the origin of this effect is rooted in the thermal evaporation of the non-perturbative chromomagnetic condensate. We argue that the negative moment of inertia of gluon plasma indicates the presence of a novel effect, the negative spin-vortical coupling for gluons resulting in a negative gluonic Barnett effect: the spin polarization of gluons exceeds the total angular momentum of rotating plasma, thus forcing the orbital angular momentum to take negative values in the supervortical range of temperatures. |
1005.2756 | V. Sreekanth | Jitesh R. Bhatt, Hiranmaya Mishra and V. Sreekanth | Cavitation and thermal photon production in relativistic heavy ion
collisions | 9 pages, 11 figures, title changed, Talk given by Sreekanth V. at
International School and Workshop, Dense QCD Phases in Heavy-Ion Collisions,
August 21st - September 4th, 2010 JINR Dubna, Russia | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the thermal photon production-rates using one dimensional
boost-invariant second order relativistic hydrodynamics to find proper time
evolution of the energy density and the temperature. The effect of
bulk-viscosity and non-ideal equation of state are taken into account in a
manner consistent with recent lattice QCD estimates. It is shown that the
\textit{non-ideal} gas equation of state i.e $\epsilon-3 P \neq 0$ behaviour of
the expanding plasma, which is important near the phase-transition point, can
significantly slow down the hydrodynamic expansion and thereby increase the
photon production-rates. Inclusion of the bulk viscosity may also have similar
effect on the hydrodynamic evolution. However the effect of bulk viscosity is
shown to be significantly lower than the \textit{non-ideal} gas equation of
state. We also analyze the interesting phenomenon of bulk viscosity induced
cavitation making the hydrodynamical description invalid. It is shown that
ignoring the cavitiation phenomenon can lead to a very significant over
estimation of the photon flux. It is argued that this feature could be relevant
in studying signature of cavitation in relativistic heavy ion collisions.
| [
{
"created": "Sun, 16 May 2010 15:47:59 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Nov 2010 14:56:52 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Bhatt",
"Jitesh R.",
""
],
[
"Mishra",
"Hiranmaya",
""
],
[
"Sreekanth",
"V.",
""
]
] | We investigate the thermal photon production-rates using one dimensional boost-invariant second order relativistic hydrodynamics to find proper time evolution of the energy density and the temperature. The effect of bulk-viscosity and non-ideal equation of state are taken into account in a manner consistent with recent lattice QCD estimates. It is shown that the \textit{non-ideal} gas equation of state i.e $\epsilon-3 P \neq 0$ behaviour of the expanding plasma, which is important near the phase-transition point, can significantly slow down the hydrodynamic expansion and thereby increase the photon production-rates. Inclusion of the bulk viscosity may also have similar effect on the hydrodynamic evolution. However the effect of bulk viscosity is shown to be significantly lower than the \textit{non-ideal} gas equation of state. We also analyze the interesting phenomenon of bulk viscosity induced cavitation making the hydrodynamical description invalid. It is shown that ignoring the cavitiation phenomenon can lead to a very significant over estimation of the photon flux. It is argued that this feature could be relevant in studying signature of cavitation in relativistic heavy ion collisions. |
hep-ph/9507283 | Atsushi Yamada | A. I. Sanda and Atsushi Yamada | A new method of determining $|V_{ub}|$ by the processes $\bar{B} \to
\rho l \bar{\nu}$ and $\bar{B} \to K^* l \lbar$ | Latex file 9 page | Phys.Rev.Lett. 75 (1995) 2807-2810 | 10.1103/PhysRevLett.75.2807 | DPNU-95-17 and UT-709 | hep-ph | null | The differential decay width of the process $\bar{B} \rightarrow \rho l
\bar{\nu}$ is related to that of the process $\bar{B} \rightarrow K^* l \lbar$
by using $SU(3)$-flavor symmetry and the heavy quark symmetry. The ratio of the
Kobayashi-Maskawa matrix elements is obtained in the zero recoil limit of
$\rho$ and $K^*$, allowing a determination of $|V_{ub}|$.
| [
{
"created": "Tue, 11 Jul 1995 06:48:53 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Sanda",
"A. I.",
""
],
[
"Yamada",
"Atsushi",
""
]
] | The differential decay width of the process $\bar{B} \rightarrow \rho l \bar{\nu}$ is related to that of the process $\bar{B} \rightarrow K^* l \lbar$ by using $SU(3)$-flavor symmetry and the heavy quark symmetry. The ratio of the Kobayashi-Maskawa matrix elements is obtained in the zero recoil limit of $\rho$ and $K^*$, allowing a determination of $|V_{ub}|$. |
hep-ph/0603224 | Feng-Quan Wu | F. Q. Wu and B. S. Zou | Subthreshold rho contribution in J/psi decay to omega pion pion and Kaon
anti-Kaon pion | 12 pages, 5 figures | Phys.Rev.D73:114008,2006 | 10.1103/PhysRevD.73.114008 | null | hep-ph nucl-th | null | We carry out a theoretical and Monte Carlo study on the $J/\psi$ decays into
$\omega\pi\pi$ and $K\bar{K}\pi$ through intermediate subthreshold $\rho$ meson
by using SU(3)-symmetric Lagrangian approach. It is found that the subthreshold
$\rho$ contribution is not negligible and may have significant influence on
partial wave analysis of resonances in these channels, especially near the
$\omega \pi$ and $K \bar{K}$ thresholds.
| [
{
"created": "Mon, 27 Mar 2006 14:44:53 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2006 08:39:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wu",
"F. Q.",
""
],
[
"Zou",
"B. S.",
""
]
] | We carry out a theoretical and Monte Carlo study on the $J/\psi$ decays into $\omega\pi\pi$ and $K\bar{K}\pi$ through intermediate subthreshold $\rho$ meson by using SU(3)-symmetric Lagrangian approach. It is found that the subthreshold $\rho$ contribution is not negligible and may have significant influence on partial wave analysis of resonances in these channels, especially near the $\omega \pi$ and $K \bar{K}$ thresholds. |
hep-ph/0107169 | Gi-Chol Cho | Gi-Chol Cho (Ochanomizu Univ.) | Muon g-2 and Minimal Supersymmetric Standard Model | 15 pages, latex, 6 figures. Talk given at ``Theory Meeting on Physics
at Linear Colliders'', Mar 15-17, 2001, KEK, Tsukuba, Japan | null | null | OCHA-PP-179 | hep-ph | null | The supersymmetric contribution to the muon g-2 is studied in light of the
finalization of the LEP electroweak precision data. The recent precise
measurement of the muon g-2 of E821 experiment is explained well by the
relatively light chargino and sleptons. We find that such the MSSM parameter
space is also favored from the electroweak precision data, in which the fit to
the data is better than that of the SM (\Delta \chi^2_{min} \sim -2), if the
lighter chargino has a mixed higgsino-wino character (\mu/M_2 \sim 1). The
models with light gauginos (\mu/M_2 > 10) or light higgsinos (\mu/M_2 < 0.1)
also show the better fit over the SM, but the improvement is marginal as
compared to the case of the mixed higgsino-wino case (\mu/M_2 \sim 1).
| [
{
"created": "Mon, 16 Jul 2001 07:18:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cho",
"Gi-Chol",
"",
"Ochanomizu Univ."
]
] | The supersymmetric contribution to the muon g-2 is studied in light of the finalization of the LEP electroweak precision data. The recent precise measurement of the muon g-2 of E821 experiment is explained well by the relatively light chargino and sleptons. We find that such the MSSM parameter space is also favored from the electroweak precision data, in which the fit to the data is better than that of the SM (\Delta \chi^2_{min} \sim -2), if the lighter chargino has a mixed higgsino-wino character (\mu/M_2 \sim 1). The models with light gauginos (\mu/M_2 > 10) or light higgsinos (\mu/M_2 < 0.1) also show the better fit over the SM, but the improvement is marginal as compared to the case of the mixed higgsino-wino case (\mu/M_2 \sim 1). |
hep-ph/9307344 | Robert Shrock | Alexander Kusenko and Robert Shrock | A New Model for Fermion Masses in Supersymmetric Grand Unified Theories | Latex, 8 p., ITP-SB-93-37 (revised version contains minor changes in
some wording and citations; no changes in analytic or numerical results.) | Phys.Rev.D49:4962-4965,1994 | 10.1103/PhysRevD.49.4962 | null | hep-ph | null | We present a simple model for fermion mass matrices and quark mixing in the
context of supersymmetric grand unified theories and show its agreement with
experiment. Our model realizes the GUT mass relations $m_d=3m_e$, $m_s=
m_\mu/3$, $m_b=m_\tau$ in a new way and is easily consistent with values of
$m_t$ suggested by MSSM fits to LEP data.
| [
{
"created": "Tue, 27 Jul 1993 18:46:28 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Aug 1993 21:35:06 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Kusenko",
"Alexander",
""
],
[
"Shrock",
"Robert",
""
]
] | We present a simple model for fermion mass matrices and quark mixing in the context of supersymmetric grand unified theories and show its agreement with experiment. Our model realizes the GUT mass relations $m_d=3m_e$, $m_s= m_\mu/3$, $m_b=m_\tau$ in a new way and is easily consistent with values of $m_t$ suggested by MSSM fits to LEP data. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.