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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2404.12914 | G.R. Boroun | G.R.Boroun and B.Rezaei | Reduced cross-section in Electron-Ion Colliders at small $x$ | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The nuclear reduced cross section $\sigma^{A}_{r}$, in the kinematic range of
the electron-Ion collider with center-of-mass energy
$\sqrt{s}=140~\mathrm{GeV}$ and $y{\leq}1$, is discussed. The importance of the
nuclear longitudinal structure function $F^{A}_{L}$ and its behavior owing to
the impact parameter for the heavy and light nucleus of Pb-208 and C-12 at
$Q^2=5$ and $10~\mathrm{GeV}^2$ is considered. The dependence of the ratios
$R^{A}_{F_{L}}$ and $R^{A}_{\sigma}$ on the impact parameter and the expanding
point of the gluon density at small $x$ are investigated. The factorized form
of parton distributions in nuclei is used in HIJING2.0 model.
| [
{
"created": "Fri, 19 Apr 2024 14:37:58 GMT",
"version": "v1"
}
] | 2024-04-22 | [
[
"Boroun",
"G. R.",
""
],
[
"Rezaei",
"B.",
""
]
] | The nuclear reduced cross section $\sigma^{A}_{r}$, in the kinematic range of the electron-Ion collider with center-of-mass energy $\sqrt{s}=140~\mathrm{GeV}$ and $y{\leq}1$, is discussed. The importance of the nuclear longitudinal structure function $F^{A}_{L}$ and its behavior owing to the impact parameter for the heavy and light nucleus of Pb-208 and C-12 at $Q^2=5$ and $10~\mathrm{GeV}^2$ is considered. The dependence of the ratios $R^{A}_{F_{L}}$ and $R^{A}_{\sigma}$ on the impact parameter and the expanding point of the gluon density at small $x$ are investigated. The factorized form of parton distributions in nuclei is used in HIJING2.0 model. |
0903.3410 | Eduardo Pont\'on | Hooman Davoudiasl and Eduardo Ponton | B-Decay Signatures of Warped Top-Condensation | 4 pages | Phys.Lett.B680:247-250,2009 | 10.1016/j.physletb.2009.09.002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that the light radion phi in a recently proposed Warped
Top-Condensation Model, can provide distinct signatures in b -> s phi, where
the on-shell phi can decay with displaced vertices. We find that some of the
parameter space of these models is constrained by B-meson and astrophysical
data. Future B-decay measurements can lead to the discovery of the WTCM.
| [
{
"created": "Thu, 19 Mar 2009 20:02:02 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Ponton",
"Eduardo",
""
]
] | We point out that the light radion phi in a recently proposed Warped Top-Condensation Model, can provide distinct signatures in b -> s phi, where the on-shell phi can decay with displaced vertices. We find that some of the parameter space of these models is constrained by B-meson and astrophysical data. Future B-decay measurements can lead to the discovery of the WTCM. |
hep-ph/0210351 | Daniele Dominici | Marco Battaglia, Stefania De Curtis and Daniele Dominici | Studies of New Vector Resonances at the CLIC Multi-TeV e+e- Collider | 17 pages, 16 EPS figures, uses JHEP3.cls | JHEP 0212:004,2002 | 10.1088/1126-6708/2002/12/004 | DFF 395/10/02 | hep-ph | null | Several models predict the existence of new vector resonances in the
multi-TeV region, which can be produced in high energy e+e- collisions in the
s-channel. In this paper we review the existing limits on the masses of these
resonances from LEP/SLC and TEVATRON data and from atomic parity violation in
some specific models. We study the potential of a multi-TeV e+e- collider, such
as CLIC, for the determination of their properties and nature.
| [
{
"created": "Fri, 25 Oct 2002 14:57:26 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Battaglia",
"Marco",
""
],
[
"De Curtis",
"Stefania",
""
],
[
"Dominici",
"Daniele",
""
]
] | Several models predict the existence of new vector resonances in the multi-TeV region, which can be produced in high energy e+e- collisions in the s-channel. In this paper we review the existing limits on the masses of these resonances from LEP/SLC and TEVATRON data and from atomic parity violation in some specific models. We study the potential of a multi-TeV e+e- collider, such as CLIC, for the determination of their properties and nature. |
2307.11089 | Michel Stillger | Philipp B\"oer, Matthias Neubert, Michel Stillger (JGU Mainz) | Glauber Phases in Non-Global LHC Observables: Resummation for
Quark-Initiated Processes | 24 pages, 4 figures, minor changes, matches journal version | JHEP 10 (2023) 075 | 10.1007/JHEP10(2023)075 | MITP-23-010 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been known for many years that jet cross sections at hadron colliders
exhibit double-logarithmic corrections starting at four-loop order, arising
from two soft Glauber-gluon interactions between the two colliding partons. The
resummation of these "super-leading logarithms" has been achieved only recently
by means of a renormalization-group treatment in soft-collinear effective
theory. We generalize this result and, within the same framework and for
quark-initiated processes, resum the double logarithms arising in the presence
of an arbitrary number of Glauber-gluon exchanges. For typical choices of
parameters, the higher-order Glauber terms give rise to corrections which are
expected to be numerically of the same magnitude as the super-leading
logarithms. However, we find that the Glauber series for jet cross sections is
dominated by the two-Glauber contribution, if the colliding partons are quarks
or anti-quarks.
| [
{
"created": "Thu, 20 Jul 2023 17:59:50 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2023 13:57:08 GMT",
"version": "v2"
}
] | 2023-10-17 | [
[
"Böer",
"Philipp",
"",
"JGU Mainz"
],
[
"Neubert",
"Matthias",
"",
"JGU Mainz"
],
[
"Stillger",
"Michel",
"",
"JGU Mainz"
]
] | It has been known for many years that jet cross sections at hadron colliders exhibit double-logarithmic corrections starting at four-loop order, arising from two soft Glauber-gluon interactions between the two colliding partons. The resummation of these "super-leading logarithms" has been achieved only recently by means of a renormalization-group treatment in soft-collinear effective theory. We generalize this result and, within the same framework and for quark-initiated processes, resum the double logarithms arising in the presence of an arbitrary number of Glauber-gluon exchanges. For typical choices of parameters, the higher-order Glauber terms give rise to corrections which are expected to be numerically of the same magnitude as the super-leading logarithms. However, we find that the Glauber series for jet cross sections is dominated by the two-Glauber contribution, if the colliding partons are quarks or anti-quarks. |
hep-ph/0102307 | Rula Tabbash | G. Dvali, S. Randjbar-Daemi, R. Tabbash | The Origin of Spontaneous Symmetry Breaking in Theories with Large Extra
Dimensions | 33 pages. Version accepted for publication in Phys.Rev.D | Phys.Rev. D65 (2002) 064021 | 10.1103/PhysRevD.65.064021 | null | hep-ph hep-th | null | We suggest that the electroweak Higgs particles can be identified with
extra-dimensional components of the gauge fields, which after compactification
on a certain topologically non-trivial background become tachyonic and
condense. If the tachyonic mass is a tree level effect, the natural scale of
the gauge symmetry breaking is set by the inverse radius of the internal space,
which, in case of the electroweak symmetry, must be around $\sim 1/$TeV. We
discuss the possibility of a vanishing tree level mass for the Higgs. In such a
scenario the tachyonic mass can be induced by quantum loops and can be
naturally smaller than the compactification scale. We give an example in which
this possibility can be realized. Starting from an Einstein--Yang--Mills theory
coupled to fermions in 10-dimensions, we are able to reproduce the spectrum of
the Standard Model like chiral fermions and Higgs type scalars in 4-dimensions
upon compactifying on ${\mathbb{C}}P^1\times {\mathbb{C}}P^2$. The existence of
a monopole solution on ${\mathbb{C}}P^1$ and a self dual U(1) instanton on
${\mathbb{C}}P^2$ are essential in obtaining chiral fermions as well as
tachyonic or massless scalars in 4-dimensions. We give a simple rule which
helps us to identify the presence of tachyons on the monopole background on
$S^2$.
| [
{
"created": "Mon, 26 Feb 2001 16:45:34 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2001 19:40:31 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Nov 2001 16:28:30 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Dvali",
"G.",
""
],
[
"Randjbar-Daemi",
"S.",
""
],
[
"Tabbash",
"R.",
""
]
] | We suggest that the electroweak Higgs particles can be identified with extra-dimensional components of the gauge fields, which after compactification on a certain topologically non-trivial background become tachyonic and condense. If the tachyonic mass is a tree level effect, the natural scale of the gauge symmetry breaking is set by the inverse radius of the internal space, which, in case of the electroweak symmetry, must be around $\sim 1/$TeV. We discuss the possibility of a vanishing tree level mass for the Higgs. In such a scenario the tachyonic mass can be induced by quantum loops and can be naturally smaller than the compactification scale. We give an example in which this possibility can be realized. Starting from an Einstein--Yang--Mills theory coupled to fermions in 10-dimensions, we are able to reproduce the spectrum of the Standard Model like chiral fermions and Higgs type scalars in 4-dimensions upon compactifying on ${\mathbb{C}}P^1\times {\mathbb{C}}P^2$. The existence of a monopole solution on ${\mathbb{C}}P^1$ and a self dual U(1) instanton on ${\mathbb{C}}P^2$ are essential in obtaining chiral fermions as well as tachyonic or massless scalars in 4-dimensions. We give a simple rule which helps us to identify the presence of tachyons on the monopole background on $S^2$. |
1211.1320 | Veronica Sanz | Eduard Masso (IFAE) and Veronica Sanz (CERN and York) | Limits on Anomalous Couplings of the Higgs to Electroweak Gauge Bosons
from LEP and LHC | 16 figures, 20 pages, replaced with published version | null | 10.1103/PhysRevD.87.033001 | CERN-PH-TH/2012-298 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we assume the Higgs is an elementary scalar, and study how new
physics could affect its couplings to electroweak gauge bosons. Adding LHC data
to LEP data provides new, more stringent limits, particularly when the Higgs to
two photon decay signal strength is taken into account. We then study the
effect of anomalous angular correlations in the decay to WW*. We obtain a new
limit on the rare decay to photon-Z, and use it to constrain Supersymmetry, to
find that staus with large mixing would be most sensitive to this channel. We
also use these limits to constrain radion exchange in Warped Extra-Dimensions,
finding a limit on the radion mass and interaction scale of the order of TeV.
Finally, we have extrapolated the current data to obtain prospects for the full
2012 dataset.
| [
{
"created": "Tue, 6 Nov 2012 17:36:46 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2013 13:21:22 GMT",
"version": "v2"
}
] | 2013-07-01 | [
[
"Masso",
"Eduard",
"",
"IFAE"
],
[
"Sanz",
"Veronica",
"",
"CERN and York"
]
] | In this paper we assume the Higgs is an elementary scalar, and study how new physics could affect its couplings to electroweak gauge bosons. Adding LHC data to LEP data provides new, more stringent limits, particularly when the Higgs to two photon decay signal strength is taken into account. We then study the effect of anomalous angular correlations in the decay to WW*. We obtain a new limit on the rare decay to photon-Z, and use it to constrain Supersymmetry, to find that staus with large mixing would be most sensitive to this channel. We also use these limits to constrain radion exchange in Warped Extra-Dimensions, finding a limit on the radion mass and interaction scale of the order of TeV. Finally, we have extrapolated the current data to obtain prospects for the full 2012 dataset. |
hep-ph/9907273 | Johann Rafelski | D. Brian Walton(1) and Johann Rafelski(2) ((1) Program in Applied
Mathematics, and (2) Physics Department, University of Arizona) | Equilibrium Distribution of Heavy Quarks in Fokker-Planck Dynamics | 4 pages including 2 figures | Phys.Rev.Lett. 84 (2000) 31-34 | 10.1103/PhysRevLett.84.31 | null | hep-ph | null | We obtain within Fokker-Planck dynamics an explicit generalization of
Einstein's relation between drag, diffusion and equilibrium distribution for a
spatially homogeneous system, considering both the transverse and longitudinal
diffusion for dimension n>1. We then provide a complete characterization of
when the equilibrium distribution becomes a Boltzmann/J"uttner distribution,
and when it satisfies the more general Tsallis distribution. We apply this
analysis to recent calculations of drag and diffusion of a charm quark in a
thermal plasma, and show that only a Tsallis distribution describes the
equilibrium distribution well. We also provide a practical recipe applicable to
highly relativistic plasmas, for determining both diffusion coefficients so
that a specific equilibrium distribution will arise for a given drag
coefficient.
| [
{
"created": "Wed, 7 Jul 1999 23:10:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Walton",
"D. Brian",
""
],
[
"Rafelski",
"Johann",
""
]
] | We obtain within Fokker-Planck dynamics an explicit generalization of Einstein's relation between drag, diffusion and equilibrium distribution for a spatially homogeneous system, considering both the transverse and longitudinal diffusion for dimension n>1. We then provide a complete characterization of when the equilibrium distribution becomes a Boltzmann/J"uttner distribution, and when it satisfies the more general Tsallis distribution. We apply this analysis to recent calculations of drag and diffusion of a charm quark in a thermal plasma, and show that only a Tsallis distribution describes the equilibrium distribution well. We also provide a practical recipe applicable to highly relativistic plasmas, for determining both diffusion coefficients so that a specific equilibrium distribution will arise for a given drag coefficient. |
hep-ph/9610429 | Trueman | T.L.Trueman | CNI Polarimetry and the Hadronic Spin Dependence of pp Scattering | 11 pages Latex, 6 eps figures | null | null | null | hep-ph | null | Methods for limiting the size of hadronic spin-flip in the Coulomb-Nuclear
Interference region are critically assessed. This work was presented at the
High Energy Polarimetry Workshop in Amsterdam, Sept.9, 1996 and the RHIC Spin
Collaboration meeting in Marseille, Sept. 17, 1996.
| [
{
"created": "Mon, 21 Oct 1996 16:55:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Trueman",
"T. L.",
""
]
] | Methods for limiting the size of hadronic spin-flip in the Coulomb-Nuclear Interference region are critically assessed. This work was presented at the High Energy Polarimetry Workshop in Amsterdam, Sept.9, 1996 and the RHIC Spin Collaboration meeting in Marseille, Sept. 17, 1996. |
1701.06328 | Serguey Petcov | S.M. Bilenky, F. Capozzi and S.T. Petcov | An Alternative Method of Determining the Neutrino Mass Ordering in
Reactor Neutrino Experiments | 11 pages, 4 figures; analysis corrected, updated and extended, figure
1 corrected, 3 more figures and references added, references updated;
sensitivities to neutrino mass ordering, $\sin^2\theta_{12}$ and $\Delta
m^2_{atm}$ match those of the standard method | null | null | Ref. SISSA 04/2017/FISI, Ref. IPMU17-0014 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a novel alternative method of determining the neutrino mass
ordering in medium baseline experiments with reactor anti-neutrinos. Results on
the potential sensitivity of the new method are also presented.
| [
{
"created": "Mon, 23 Jan 2017 10:48:52 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2020 15:47:40 GMT",
"version": "v2"
}
] | 2020-08-13 | [
[
"Bilenky",
"S. M.",
""
],
[
"Capozzi",
"F.",
""
],
[
"Petcov",
"S. T.",
""
]
] | We discuss a novel alternative method of determining the neutrino mass ordering in medium baseline experiments with reactor anti-neutrinos. Results on the potential sensitivity of the new method are also presented. |
1201.2658 | Kevin Dusling | Kevin Dusling and Raju Venugopalan | Azimuthal collimation of long range rapidity correlations by strong
color fields in high multiplicity hadron-hadron collisions | accepted version for PRL | null | 10.1103/PhysRevLett.108.262001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The azimuthal collimation of di-hadrons with large rapidity separations in
high multiplicity p+p collisions at the LHC is described in the Color Glass
Condensate (CGC) effective theory [1] by N_c^2 suppressed multi-ladder QCD
diagrams that are enhanced \alpha_S^(-8) due to gluon saturation in hadron
wavefunctions. We show that quantitative computations in the CGC framework are
in good agreement with data from the CMS experiment on per trigger di-hadron
yields and predict further systematics of these yields with varying trigger pT
and charged hadron multiplicity. Radial flow generated by re-scattering is
strongly limited by the structure of the p+p di-hadron correlations. In
contrast, radial flow explains the systematics of identical measurements in
heavy ion collisions.
| [
{
"created": "Thu, 12 Jan 2012 20:05:08 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jun 2012 14:30:10 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Dusling",
"Kevin",
""
],
[
"Venugopalan",
"Raju",
""
]
] | The azimuthal collimation of di-hadrons with large rapidity separations in high multiplicity p+p collisions at the LHC is described in the Color Glass Condensate (CGC) effective theory [1] by N_c^2 suppressed multi-ladder QCD diagrams that are enhanced \alpha_S^(-8) due to gluon saturation in hadron wavefunctions. We show that quantitative computations in the CGC framework are in good agreement with data from the CMS experiment on per trigger di-hadron yields and predict further systematics of these yields with varying trigger pT and charged hadron multiplicity. Radial flow generated by re-scattering is strongly limited by the structure of the p+p di-hadron correlations. In contrast, radial flow explains the systematics of identical measurements in heavy ion collisions. |
1901.02320 | Leonid Slad | L.M. Slad | Solar neutrino problem as evidence of new interaction | 16 pages. v2: Several corrections in the text. arXiv admin note:
substantial text overlap with arXiv:1502.03262, arXiv:1808.05103 | JETP 129 (2019) 973-984; ZhETF 156 (2019) 1064-1077 | 10.1134/S1063776119120197 | null | hep-ph astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new concept is proposed to solve the solar neutrino problem, that is based
on a hypothesis about the existence of a new interaction of electron neutrinos
with nucleons mediated by massless pseudoscalar bosons. At every collision of a
neutrino with nucleons of the Sun, its handedness changes from left to right
and vice versa, and its energy decreases. The postulated hypothesis, having
only one free parameter, provides a good agreement between the calculated and
experimental characteristics of all five observed processes with solar
neutrinos.
| [
{
"created": "Tue, 8 Jan 2019 14:24:15 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2019 08:02:29 GMT",
"version": "v2"
}
] | 2019-12-24 | [
[
"Slad",
"L. M.",
""
]
] | A new concept is proposed to solve the solar neutrino problem, that is based on a hypothesis about the existence of a new interaction of electron neutrinos with nucleons mediated by massless pseudoscalar bosons. At every collision of a neutrino with nucleons of the Sun, its handedness changes from left to right and vice versa, and its energy decreases. The postulated hypothesis, having only one free parameter, provides a good agreement between the calculated and experimental characteristics of all five observed processes with solar neutrinos. |
hep-ph/0606078 | St\'ephane Lavignac | Pierre Hosteins, Stephane Lavignac, Carlos A. Savoy | Quark-Lepton Unification and Eight-Fold Ambiguity in the Left-Right
Symmetric Seesaw Mechanism | 31 pages, 32 figures. Appendix augmented with useful analytic
formulae, a few typos corrected, 2 references added | Nucl.Phys. B755 (2006) 137-163 | 10.1016/j.nuclphysb.2006.07.028 | SACLAY-T06/048 | hep-ph | null | In many extensions of the Standard Model, including a broad class of
left-right symmetric and Grand Unified theories, the light neutrino mass matrix
is given by the left-right symmetric seesaw formula $M_\nu = f v_L -
\frac{v^2}{v_R} Y_\nu f^{-1} Y_\nu$, in which the right-handed neutrino mass
matrix and the $SU(2)_L$ triplet couplings are proportional to the same matrix
f. We propose a systematic procedure for reconstructing the $2^n$ solutions (in
the n-family case) for the matrix f as a function of the Dirac neutrino
couplings $(Y_\nu)_{ij}$ and of the light neutrino mass parameters, which can
be used in both analytical and numerical studies. We apply this procedure to a
particular class of supersymmetric SO(10) models with two 10-dimensional and a
pair of $126 + \bar{126}$ representations in the Higgs sector, and study the
properties of the corresponding 8 right-handed neutrino spectra. Then, using
the reconstructed right-handed neutrino and triplet parameters, we study
leptogenesis and lepton flavour violation in these models, and comment on
flavour effects in leptogenesis in the type I limit. We find that the mixed
solutions where both the type I and the type II seesaw mechanisms give a
significant contribution to neutrino masses provide new opportunities for
successful leptogenesis in SO(10) GUTs.
| [
{
"created": "Wed, 7 Jun 2006 19:37:00 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2006 10:54:23 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Hosteins",
"Pierre",
""
],
[
"Lavignac",
"Stephane",
""
],
[
"Savoy",
"Carlos A.",
""
]
] | In many extensions of the Standard Model, including a broad class of left-right symmetric and Grand Unified theories, the light neutrino mass matrix is given by the left-right symmetric seesaw formula $M_\nu = f v_L - \frac{v^2}{v_R} Y_\nu f^{-1} Y_\nu$, in which the right-handed neutrino mass matrix and the $SU(2)_L$ triplet couplings are proportional to the same matrix f. We propose a systematic procedure for reconstructing the $2^n$ solutions (in the n-family case) for the matrix f as a function of the Dirac neutrino couplings $(Y_\nu)_{ij}$ and of the light neutrino mass parameters, which can be used in both analytical and numerical studies. We apply this procedure to a particular class of supersymmetric SO(10) models with two 10-dimensional and a pair of $126 + \bar{126}$ representations in the Higgs sector, and study the properties of the corresponding 8 right-handed neutrino spectra. Then, using the reconstructed right-handed neutrino and triplet parameters, we study leptogenesis and lepton flavour violation in these models, and comment on flavour effects in leptogenesis in the type I limit. We find that the mixed solutions where both the type I and the type II seesaw mechanisms give a significant contribution to neutrino masses provide new opportunities for successful leptogenesis in SO(10) GUTs. |
1602.06740 | Wolfgang Sch\"afer | Wolfgang Sch\"afer, Antoni Szczurek | Low mass Drell-Yan production of lepton pairs at forward directions at
the LHC: a hybrid approach | 25 pages, 15 figures, v2:refs. added | Phys. Rev. D 93, 074014 (2016) | 10.1103/PhysRevD.93.074014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss Drell-Yan production of dileptons at high energies in forward
rapidity region in a hybrid high-energy approach. This approach uses
unintegrated gluon distributions in one proton and collinear quark/antiquark
distributions in the second proton. Corresponding momentum-space formula for
the differential cross sections in high-energy approximation has been derived
and will be presented. The relation to the commonly used dipole approach is
discussed. We conclude and illustrate that some results of the dipole
approaches are too approximate, as far as kinematics is considered, and in fact
cannot be used when comparing with real experimental data. We find that the
dipole formula is valid only in very forward/backward rapidity regions ($|y| >$
5) that cannot be studied experimentally in the moment. We performed
calculations of some differential cross sections for low-mass dilepton
production by the LHCb and ATLAS collaborations. In distinction to most of
dipole approaches, we include all of the four Drell-Yan structure functions,
although the impact of interference structure functions is rather small for the
relevant experimental cuts. We find that both side contributions ($g + q/\bar
q$ and $q/\bar q + g$) have to be included even for the LHCb rapidity coverage
which is in contradiction with what is usually done in the dipole approach. We
present results for different unintegrated gluon distributions from the
literature (some of them include saturation effects). We see no clear hints of
saturation even at small $M_{ll}$ when comparing with the LHCb data.
| [
{
"created": "Mon, 22 Feb 2016 11:53:06 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Feb 2016 15:03:11 GMT",
"version": "v2"
}
] | 2016-04-20 | [
[
"Schäfer",
"Wolfgang",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss Drell-Yan production of dileptons at high energies in forward rapidity region in a hybrid high-energy approach. This approach uses unintegrated gluon distributions in one proton and collinear quark/antiquark distributions in the second proton. Corresponding momentum-space formula for the differential cross sections in high-energy approximation has been derived and will be presented. The relation to the commonly used dipole approach is discussed. We conclude and illustrate that some results of the dipole approaches are too approximate, as far as kinematics is considered, and in fact cannot be used when comparing with real experimental data. We find that the dipole formula is valid only in very forward/backward rapidity regions ($|y| >$ 5) that cannot be studied experimentally in the moment. We performed calculations of some differential cross sections for low-mass dilepton production by the LHCb and ATLAS collaborations. In distinction to most of dipole approaches, we include all of the four Drell-Yan structure functions, although the impact of interference structure functions is rather small for the relevant experimental cuts. We find that both side contributions ($g + q/\bar q$ and $q/\bar q + g$) have to be included even for the LHCb rapidity coverage which is in contradiction with what is usually done in the dipole approach. We present results for different unintegrated gluon distributions from the literature (some of them include saturation effects). We see no clear hints of saturation even at small $M_{ll}$ when comparing with the LHCb data. |
1205.0134 | Jure Zupan | Juan Herrero-Garcia, Thomas Schwetz, Jure Zupan | Astrophysics independent bounds on the annual modulation of dark matter
signals | 4 pages, 4 figures | null | 10.1103/PhysRevLett.109.141301 | UCHEP-12-04 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how constraints on the time integrated event rate from a given dark
matter (DM) direct detection experiment can be used to set a stringent
constraint on the amplitude of the annual modulation signal in another
experiment. The method requires only very mild assumptions about the properties
of the local DM distribution: that it is temporally stable on the scale of
months and spatially homogeneous on the ecliptic. We apply the method to the
annual modulation signal in DAMA/LIBRA, which we compare to the bounds derived
from the constraints on the time-averaged rates from XENON10, XENON100, CDMS
and SIMPLE. Assuming a DM mass of 10 GeV, we show that a DM interpretation of
the DAMA/LIBRA signal is excluded at 6.3sigma (4.6sigma) for isospin conserving
(violating) spin-independent interactions, and at 4.9sigma for spin-dependent
interactions on protons.
| [
{
"created": "Tue, 1 May 2012 11:09:41 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Herrero-Garcia",
"Juan",
""
],
[
"Schwetz",
"Thomas",
""
],
[
"Zupan",
"Jure",
""
]
] | We show how constraints on the time integrated event rate from a given dark matter (DM) direct detection experiment can be used to set a stringent constraint on the amplitude of the annual modulation signal in another experiment. The method requires only very mild assumptions about the properties of the local DM distribution: that it is temporally stable on the scale of months and spatially homogeneous on the ecliptic. We apply the method to the annual modulation signal in DAMA/LIBRA, which we compare to the bounds derived from the constraints on the time-averaged rates from XENON10, XENON100, CDMS and SIMPLE. Assuming a DM mass of 10 GeV, we show that a DM interpretation of the DAMA/LIBRA signal is excluded at 6.3sigma (4.6sigma) for isospin conserving (violating) spin-independent interactions, and at 4.9sigma for spin-dependent interactions on protons. |
2101.12724 | Gui-Jun Ding | Peng Chen, Gui-Jun Ding, Stephen F. King | $SU(5)$ GUTs with $A_4$ modular symmetry | 57 pages, 4 figures | null | 10.1007/JHEP04(2021)239 | USTC-ICTS/PCFT-21-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We combine $SU(5)$ Grand Unified Theories (GUTs) with $A_4$ modular symmetry
and present a comprehensive analysis of the resulting quark and lepton mass
matrices for all the simplest cases. Classifying the models according to the
representation assignments of the matter fields under $A_4$, we find that there
are seven types of $SU(5)$ models with $A_4$ modular symmetry. We present 53
benchmark models with the fewest free parameters. The parameter space of each
model is scanned to optimize the agreement between predictions and experimental
data, and predictions for the masses and mixing parameters of quarks and
leptons are given at the best fitting points. The best fit predictions for the
leptonic CP violating Dirac phase, the lightest neutrino mass and the
neutrinoless double beta decay parameter when displayed graphically are
observed to cover a wide range of possible values, but are clustered around
particular regions, allowing future neutrino experiments to discriminate
between the different types of models.
| [
{
"created": "Fri, 29 Jan 2021 18:35:30 GMT",
"version": "v1"
}
] | 2021-05-12 | [
[
"Chen",
"Peng",
""
],
[
"Ding",
"Gui-Jun",
""
],
[
"King",
"Stephen F.",
""
]
] | We combine $SU(5)$ Grand Unified Theories (GUTs) with $A_4$ modular symmetry and present a comprehensive analysis of the resulting quark and lepton mass matrices for all the simplest cases. Classifying the models according to the representation assignments of the matter fields under $A_4$, we find that there are seven types of $SU(5)$ models with $A_4$ modular symmetry. We present 53 benchmark models with the fewest free parameters. The parameter space of each model is scanned to optimize the agreement between predictions and experimental data, and predictions for the masses and mixing parameters of quarks and leptons are given at the best fitting points. The best fit predictions for the leptonic CP violating Dirac phase, the lightest neutrino mass and the neutrinoless double beta decay parameter when displayed graphically are observed to cover a wide range of possible values, but are clustered around particular regions, allowing future neutrino experiments to discriminate between the different types of models. |
hep-ph/0002165 | Bugra Borasoy | B. Borasoy | The eta' and the topological charge density | 11 pages | Eur.Phys.J. A7 (2000) 255-259 | 10.1007/PL00013605 | null | hep-ph nucl-th | null | We compare two different frameworks which have been proposed to include the
eta' in chiral perturbation theory. The equivalence of these two approaches is
shown both for the purely mesonic case and in the presence of the ground state
baryon octet. The relation between the different sets of parameters in both
Lagrangians is clarified.
| [
{
"created": "Tue, 15 Feb 2000 12:14:21 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Borasoy",
"B.",
""
]
] | We compare two different frameworks which have been proposed to include the eta' in chiral perturbation theory. The equivalence of these two approaches is shown both for the purely mesonic case and in the presence of the ground state baryon octet. The relation between the different sets of parameters in both Lagrangians is clarified. |
hep-ph/0301056 | Yusuf Dincer | Yusuf Dincer and L.M. Sehgal | Electroweak Effects in the Double Dalitz Decay $B_s \to l^+ l^- l'^+
l'^-$ | Two typos corrected: (i) factor $1/\Gamma_{\gamma\gamma}$ inserted in
Eq. (14), (ii) co-ordinate labels $x_{12},x_{34}$ inserted in Figs. 1-3. To
appear in Physics Letters B | Phys.Lett. B556 (2003) 169-176 | 10.1016/S0370-2693(03)00131-X | null | hep-ph | null | We investigate the double Dalitz decays $B_s \to l^+ l^- l'^+ l'^-$ on the
basis of the effective Hamiltonian for the transition $b \bar{s} \to l^+ l^-$,
and universal form factors suggested by QCD. The correlated mass spectrum of
the two lepton pairs in the decay $B_s \to e^+ e^- \mu^+ \mu^-$ is derived in
an efficient way, using a QED result for meson decays mediated by two virtual
photons: $B_s \to \gamma^* \gamma^* \to e^+ e^- \mu^+ \mu^-$. A comment is made
on the correlation between the planes of the two lepton pairs. The conversion
ratios $\rho_{lll'l'}= \frac{\Gamma(B_s \to l^+ l^- l'^+ l'^-)}{\Gamma(B_s \to
\gamma \gamma)}$ are estimated to be $\rho_{eeee}=3 \times 10^{-4},
\rho_{ee\mu\mu}=9 \times 10^{-5} \text{and} \rho_{\mu\mu\mu\mu}=3 \times
10^{-5}$, and are enhanced relative to pure QED by $10-30 %$.
| [
{
"created": "Thu, 9 Jan 2003 10:47:44 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jan 2003 12:01:52 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dincer",
"Yusuf",
""
],
[
"Sehgal",
"L. M.",
""
]
] | We investigate the double Dalitz decays $B_s \to l^+ l^- l'^+ l'^-$ on the basis of the effective Hamiltonian for the transition $b \bar{s} \to l^+ l^-$, and universal form factors suggested by QCD. The correlated mass spectrum of the two lepton pairs in the decay $B_s \to e^+ e^- \mu^+ \mu^-$ is derived in an efficient way, using a QED result for meson decays mediated by two virtual photons: $B_s \to \gamma^* \gamma^* \to e^+ e^- \mu^+ \mu^-$. A comment is made on the correlation between the planes of the two lepton pairs. The conversion ratios $\rho_{lll'l'}= \frac{\Gamma(B_s \to l^+ l^- l'^+ l'^-)}{\Gamma(B_s \to \gamma \gamma)}$ are estimated to be $\rho_{eeee}=3 \times 10^{-4}, \rho_{ee\mu\mu}=9 \times 10^{-5} \text{and} \rho_{\mu\mu\mu\mu}=3 \times 10^{-5}$, and are enhanced relative to pure QED by $10-30 %$. |
0903.3263 | Jiangyong Jia | Jiangyong Jia, ShinIchi Esumi and Rui Wei | Away-side asymmetry of jet correlation relative to reaction plane: a
sensitive probe for jet in-medium modifications | 4 pages and 5 figures, update to published version | Phys.Rev.Lett.103:022301,2009 | 10.1103/PhysRevLett.103.022301 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We proposed a new observable based on two particle azimuth correlation to
study the away-side medium response in mid-central Au+Au collisions. We argue
that a left/right asymmetry may appear at the away-side by selecting triggers
separately in the left and right side of the reaction plane. A simple model
estimation suggests that the magnitude of such asymmetry could reach 30% with
details depends on the medium response mechanisms. This asymmetry, if observed,
can help to distinguish competing theoretical models.
| [
{
"created": "Thu, 19 Mar 2009 01:05:28 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 2009 17:03:20 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Jia",
"Jiangyong",
""
],
[
"Esumi",
"ShinIchi",
""
],
[
"Wei",
"Rui",
""
]
] | We proposed a new observable based on two particle azimuth correlation to study the away-side medium response in mid-central Au+Au collisions. We argue that a left/right asymmetry may appear at the away-side by selecting triggers separately in the left and right side of the reaction plane. A simple model estimation suggests that the magnitude of such asymmetry could reach 30% with details depends on the medium response mechanisms. This asymmetry, if observed, can help to distinguish competing theoretical models. |
2312.13885 | Gerhard Buchalla | G. Buchalla, F. K\"onig, Ch. M\"uller-Salditt, F. Pandler | Two-Higgs Doublet Model Matched to Nonlinear Effective Theory | 20 pages, no figures | null | null | LMU-ASC 40/23 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We use functional methods to match the Two-Higgs Doublet Model with heavy
scalars in the nondecoupling regime to the appropriate nonlinear effective
field theory, which takes the form of an electroweak chiral Lagrangian (HEFT).
The effective Lagrangian is derived to leading order in the chiral counting.
This includes the loop induced $h\to\gamma\gamma$ and $h\to Z\gamma$ local
terms, which enter at the same chiral order as their counterparts in the
Standard Model. An algorithm is presented that allows us to compute the
coefficient functions to all orders in $h$. Some of the all-orders results are
given in closed form. The parameter regimes for decoupling, nondecoupling and
alignment scenarios in the effective field theory context and some
phenomenological implications are briefly discussed.
| [
{
"created": "Thu, 21 Dec 2023 14:29:18 GMT",
"version": "v1"
}
] | 2023-12-22 | [
[
"Buchalla",
"G.",
""
],
[
"König",
"F.",
""
],
[
"Müller-Salditt",
"Ch.",
""
],
[
"Pandler",
"F.",
""
]
] | We use functional methods to match the Two-Higgs Doublet Model with heavy scalars in the nondecoupling regime to the appropriate nonlinear effective field theory, which takes the form of an electroweak chiral Lagrangian (HEFT). The effective Lagrangian is derived to leading order in the chiral counting. This includes the loop induced $h\to\gamma\gamma$ and $h\to Z\gamma$ local terms, which enter at the same chiral order as their counterparts in the Standard Model. An algorithm is presented that allows us to compute the coefficient functions to all orders in $h$. Some of the all-orders results are given in closed form. The parameter regimes for decoupling, nondecoupling and alignment scenarios in the effective field theory context and some phenomenological implications are briefly discussed. |
hep-ph/9409409 | P. A. Henning | P.A.Henning and Ch.Hoelbling | Bose_einstein Correlations of Unstable Particles | 8 pages, GSI-Preprint 1 figure appendend as uucode | null | null | null | hep-ph | null | Within a field theoretical formalism suited to treat inhomogeneous hot
quantum systems, we derive the two-particle correlation function for particles
having a spectral width gamma in the region of their emission. We find, that
this correlation function measures the radius R0 of the thermal source only in
case gamma*R0 > 1.
| [
{
"created": "Mon, 26 Sep 1994 15:54:39 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Henning",
"P. A.",
""
],
[
"Hoelbling",
"Ch.",
""
]
] | Within a field theoretical formalism suited to treat inhomogeneous hot quantum systems, we derive the two-particle correlation function for particles having a spectral width gamma in the region of their emission. We find, that this correlation function measures the radius R0 of the thermal source only in case gamma*R0 > 1. |
1910.13432 | Franziska Hagelstein | Gilberto Colangelo, Franziska Hagelstein, Martin Hoferichter, Laetitia
Laub, Peter Stoffer | Longitudinal short-distance constraints for the hadronic light-by-light
contribution to $(g-2)_\mu$ with large-$N_c$ Regge models | 85 pages, 33 figures, 5 tables; journal version, includes reply to
arXiv:1911.05874 | null | 10.1007/JHEP03(2020)101 | INT-PUB-19-051 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While the low-energy part of the hadronic light-by-light (HLbL) tensor can be
constrained from data using dispersion relations, for a full evaluation of its
contribution to the anomalous magnetic moment of the muon $(g-2)_\mu$ also
mixed- and high-energy regions need to be estimated. Both can be addressed
within the operator product expansion (OPE), either for configurations where
all photon virtualities become large or one of them remains finite. Imposing
such short-distance constraints (SDCs) on the HLbL tensor is thus a major
aspect of a model-independent approach towards HLbL scattering. Here, we focus
on longitudinal SDCs, which concern the amplitudes containing the
pseudoscalar-pole contributions from $\pi^0$, $\eta$, $\eta'$. Since these
conditions cannot be fulfilled by a finite number of pseudoscalar poles, we
consider a tower of excited pseudoscalars, constraining their masses and
transition form factors from Regge theory, the OPE, and phenomenology.
Implementing a matching of the resulting expressions for the HLbL tensor onto
the perturbative QCD quark loop, we are able to further constrain our
calculation and significantly reduce its model dependence. We find that
especially for the $\pi^0$ the corresponding increase of the HLbL contribution
is much smaller than previous prescriptions in the literature would imply.
Overall, we estimate that longitudinal SDCs increase the HLbL contribution by
$\Delta a_\mu^\text{LSDC}=13(6)\times 10^{-11}$. This number does not include
the contribution from the charm quark, for which we find
$a_\mu^{c\text{-quark}}=3(1)\times 10^{-11}$.
| [
{
"created": "Tue, 29 Oct 2019 17:49:29 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2020 16:01:33 GMT",
"version": "v2"
}
] | 2020-03-24 | [
[
"Colangelo",
"Gilberto",
""
],
[
"Hagelstein",
"Franziska",
""
],
[
"Hoferichter",
"Martin",
""
],
[
"Laub",
"Laetitia",
""
],
[
"Stoffer",
"Peter",
""
]
] | While the low-energy part of the hadronic light-by-light (HLbL) tensor can be constrained from data using dispersion relations, for a full evaluation of its contribution to the anomalous magnetic moment of the muon $(g-2)_\mu$ also mixed- and high-energy regions need to be estimated. Both can be addressed within the operator product expansion (OPE), either for configurations where all photon virtualities become large or one of them remains finite. Imposing such short-distance constraints (SDCs) on the HLbL tensor is thus a major aspect of a model-independent approach towards HLbL scattering. Here, we focus on longitudinal SDCs, which concern the amplitudes containing the pseudoscalar-pole contributions from $\pi^0$, $\eta$, $\eta'$. Since these conditions cannot be fulfilled by a finite number of pseudoscalar poles, we consider a tower of excited pseudoscalars, constraining their masses and transition form factors from Regge theory, the OPE, and phenomenology. Implementing a matching of the resulting expressions for the HLbL tensor onto the perturbative QCD quark loop, we are able to further constrain our calculation and significantly reduce its model dependence. We find that especially for the $\pi^0$ the corresponding increase of the HLbL contribution is much smaller than previous prescriptions in the literature would imply. Overall, we estimate that longitudinal SDCs increase the HLbL contribution by $\Delta a_\mu^\text{LSDC}=13(6)\times 10^{-11}$. This number does not include the contribution from the charm quark, for which we find $a_\mu^{c\text{-quark}}=3(1)\times 10^{-11}$. |
1605.00523 | Dr. Rukmani Mohanta | C. Soumya, R. Mohanta | Towards extracting the best possible results from NOvA | 15 pages, 8 figures, to appear in EPJC | null | 10.1140/epjc/s10052-016-4125-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The NuMI Off-Axis $\nu_{e}$ Appearance (NO$\nu$A) is the currently running
leading long-baseline neutrino oscillation experiment, whose main physics goal
is to explore the current issues in the neutrino sector, such as determination
of the neutrino mass ordering, resolution of the octant of atmospheric mixing
angle and to constrain the Dirac-type CP violating phase $\delta_{CP}$. In this
paper, we would like to investigate whether it is possible to extract the best
possible results from NO$\nu$A with a shorter time-span than its scheduled run
period by analyzing its capability to discriminate the degeneracy among various
neutrino oscillation parameters within four years of run time, with two years
in each neutrino and antineutrino modes. Further, we study the same by adding
the data from T2K experiment for a total of five years run with 3.5 years in
neutrino mode and 1.5 years in antineutrino mode. We find that NO$\nu$A (2+2)
has a better oscillation parameter degeneracy discrimination capability
compared to its scheduled run period for four years, i.e, NO$\nu$A (3+1).
| [
{
"created": "Mon, 2 May 2016 15:23:11 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Soumya",
"C.",
""
],
[
"Mohanta",
"R.",
""
]
] | The NuMI Off-Axis $\nu_{e}$ Appearance (NO$\nu$A) is the currently running leading long-baseline neutrino oscillation experiment, whose main physics goal is to explore the current issues in the neutrino sector, such as determination of the neutrino mass ordering, resolution of the octant of atmospheric mixing angle and to constrain the Dirac-type CP violating phase $\delta_{CP}$. In this paper, we would like to investigate whether it is possible to extract the best possible results from NO$\nu$A with a shorter time-span than its scheduled run period by analyzing its capability to discriminate the degeneracy among various neutrino oscillation parameters within four years of run time, with two years in each neutrino and antineutrino modes. Further, we study the same by adding the data from T2K experiment for a total of five years run with 3.5 years in neutrino mode and 1.5 years in antineutrino mode. We find that NO$\nu$A (2+2) has a better oscillation parameter degeneracy discrimination capability compared to its scheduled run period for four years, i.e, NO$\nu$A (3+1). |
1405.6598 | Alexander Studenikin | Ilya Balantsev and Alexander Studenikin | Spin light of electron in dense neutrino fluxes | 15 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An electron motion in a dense neutrino flux is investigated. The Dirac
equation exact solutions for the electron energy and wave function in this
external environment are obtained. On this basis we predict the existence of an
electromagnetic radiation that can be emitted by electrons in dense neutrino
fluxes. We term this phenomenon "the spin light of electron in dense neutrino
flux" ($SLe_{\nu}$). The main properties of the $SLe_{\nu}$ are studied. We
argue that the $SLe_{\nu}$ in dense neutrino fluxes should have important
consequences in astrophysics and for supernovae processes in particular.
| [
{
"created": "Sun, 18 May 2014 17:15:19 GMT",
"version": "v1"
}
] | 2014-05-27 | [
[
"Balantsev",
"Ilya",
""
],
[
"Studenikin",
"Alexander",
""
]
] | An electron motion in a dense neutrino flux is investigated. The Dirac equation exact solutions for the electron energy and wave function in this external environment are obtained. On this basis we predict the existence of an electromagnetic radiation that can be emitted by electrons in dense neutrino fluxes. We term this phenomenon "the spin light of electron in dense neutrino flux" ($SLe_{\nu}$). The main properties of the $SLe_{\nu}$ are studied. We argue that the $SLe_{\nu}$ in dense neutrino fluxes should have important consequences in astrophysics and for supernovae processes in particular. |
hep-ph/9505303 | Thomas Teubner | J.H. Kuehn | Tau Polarimetry with Multi Meson States | 4 pages, LaTex. The complete paper is also available via anonymous
ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ , or via www at
http://ttpux2.physik.uni-karlsruhe.de/cgi-bin/preprints/ | Phys.Rev. D52 (1995) 3128-3129 | 10.1103/PhysRevD.52.3128 | TTP95-21 | hep-ph | null | It is demonstrated that the analyzing power of multi-meson final states in
semileptonic $\tau$ decays with respect to the $\tau$ spin is equal and maximal
for all decay modes.
| [
{
"created": "Sun, 14 May 1995 17:28:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kuehn",
"J. H.",
""
]
] | It is demonstrated that the analyzing power of multi-meson final states in semileptonic $\tau$ decays with respect to the $\tau$ spin is equal and maximal for all decay modes. |
1607.01199 | Renata Jora | Amir H. Fariborz, Renata Jora | Spontaneous symmetry breaking and Goldstone theorem for composite states
revisited | 7 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the well-known phenomenon of spontaneous symmetry breaking for a
linear sigma model for scalar and pseudoscalar mesons based on the meson
composite structure and the normalization of the quantum states. To test our
formulation and validate our approach we give another proof of the Goldstone
theorem and derive the corresponding mass eigenstates of the theory. We briefly
describe the possible wave function of a meson that leads to the adequate mass
eigenstates.
| [
{
"created": "Tue, 5 Jul 2016 11:44:58 GMT",
"version": "v1"
}
] | 2016-07-06 | [
[
"Fariborz",
"Amir H.",
""
],
[
"Jora",
"Renata",
""
]
] | We discuss the well-known phenomenon of spontaneous symmetry breaking for a linear sigma model for scalar and pseudoscalar mesons based on the meson composite structure and the normalization of the quantum states. To test our formulation and validate our approach we give another proof of the Goldstone theorem and derive the corresponding mass eigenstates of the theory. We briefly describe the possible wave function of a meson that leads to the adequate mass eigenstates. |
hep-ph/0607305 | Olena Linnyk | O. Linnyk, S. Leupold, U. Mosel | Next-to-leading order vs. quark off-shellness and intrinsic k_T in the
Drell-Yan process | v2: shortened, references added, typos corrected | Phys.Rev.D75:014016,2007 | 10.1103/PhysRevD.75.014016 | null | hep-ph nucl-th | null | We calculate the effects of next-to-leading order perturbative QCD as well as
of the quark transverse motion and off-shellness on the Drell-Yan process cross
section. By studying the s->infinity behaviour of the cross section in these
approaches, we find that the effects of quark off-shellness and intrinsic-k_T
parametrize those of higher twists. In particular, the off-shellness of partons
generates part of the K-factor type corrections to the leading order cross
section. Higher twist contributions to the p_T-spectrum of the Drell-Yan pairs
are found to be large for presently accessible energies. The evolution of quark
off-shellness distribution with the hard scale is also studied.
| [
{
"created": "Thu, 27 Jul 2006 14:28:40 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2006 19:26:01 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Linnyk",
"O.",
""
],
[
"Leupold",
"S.",
""
],
[
"Mosel",
"U.",
""
]
] | We calculate the effects of next-to-leading order perturbative QCD as well as of the quark transverse motion and off-shellness on the Drell-Yan process cross section. By studying the s->infinity behaviour of the cross section in these approaches, we find that the effects of quark off-shellness and intrinsic-k_T parametrize those of higher twists. In particular, the off-shellness of partons generates part of the K-factor type corrections to the leading order cross section. Higher twist contributions to the p_T-spectrum of the Drell-Yan pairs are found to be large for presently accessible energies. The evolution of quark off-shellness distribution with the hard scale is also studied. |
hep-ph/9909461 | Shao-Hsuan Chiu | Shao-Hsuan Chiu and T. K. Kuo | Effects of neutrino temperatures and mass hierarchies on the detection
of supernova neutrinos | 14 pages, 5 figuress; changed content; added reference for section 1.
To appear in Phys. Rev. D (01 April 2000 issue) | Phys.Rev. D61 (2000) 073015 | 10.1103/PhysRevD.61.073015 | null | hep-ph | null | Possible outcomes of neutrino events at both Super-Kamiokande and SNO for a
type-II supernova are analyzed considering the uncertainties in SN neutrino
spectra (temperature) at emission, which may complicate the interpretation of
the observed events. With the input of parameters deduced from the current
solar and atmospheric experiments, consequences of direct-mass hierarchy
$m_{\nu_{\tau}} \gg m_{\nu_{\mu}} > m_{\nu_{e}}$ and inverted-mass hierarchy
$m_{\nu_{e}} > m_{\nu_{\mu}} \gg m_{\nu_{\tau}}$ are investigated. Even if the
$\nu$ temperatures are not precisely known, we found that future experiments
are likely to be able to separate the currently accepted solutions to the solar
neutrino problem (SNP): large angle MSW, small angle MSW, and the vacuum
oscillation, as well as to distinguish between the direct and inverted mass
hierarchies of the neutrinos.
| [
{
"created": "Tue, 21 Sep 1999 22:33:49 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jan 2000 18:19:12 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Chiu",
"Shao-Hsuan",
""
],
[
"Kuo",
"T. K.",
""
]
] | Possible outcomes of neutrino events at both Super-Kamiokande and SNO for a type-II supernova are analyzed considering the uncertainties in SN neutrino spectra (temperature) at emission, which may complicate the interpretation of the observed events. With the input of parameters deduced from the current solar and atmospheric experiments, consequences of direct-mass hierarchy $m_{\nu_{\tau}} \gg m_{\nu_{\mu}} > m_{\nu_{e}}$ and inverted-mass hierarchy $m_{\nu_{e}} > m_{\nu_{\mu}} \gg m_{\nu_{\tau}}$ are investigated. Even if the $\nu$ temperatures are not precisely known, we found that future experiments are likely to be able to separate the currently accepted solutions to the solar neutrino problem (SNP): large angle MSW, small angle MSW, and the vacuum oscillation, as well as to distinguish between the direct and inverted mass hierarchies of the neutrinos. |
hep-ph/9602328 | Renard Fernand Michel | P. Chiappetta, F.M. Renard and C. Verzegnassi | Anomalous $Z'$ effects in the WW channel at $LC 2000$ | 9 pages. (e-mail renard@lpmsun2.lpm.univ-montp2.fr) | null | null | PM/96-10, CPT-95/P.3317 | hep-ph | null | We consider the virtual signals of a $Z'$ of very general type in the process
$e^+e^-\to W^+W^-$ at a future linear $e^+e^-$ collider of 2000 GeV c.m. energy
($LC2000$). We show that possible deviations from the SM predictions in this
channel are related to similar deviations in the purely leptonic one in a way
that is only characteristic of this $Z'$ model, and not in general of possible
competitor models with anomalous gauge couplings.
| [
{
"created": "Fri, 16 Feb 1996 09:58:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chiappetta",
"P.",
""
],
[
"Renard",
"F. M.",
""
],
[
"Verzegnassi",
"C.",
""
]
] | We consider the virtual signals of a $Z'$ of very general type in the process $e^+e^-\to W^+W^-$ at a future linear $e^+e^-$ collider of 2000 GeV c.m. energy ($LC2000$). We show that possible deviations from the SM predictions in this channel are related to similar deviations in the purely leptonic one in a way that is only characteristic of this $Z'$ model, and not in general of possible competitor models with anomalous gauge couplings. |
1710.03016 | Bernhard Mistlberger | Falko Dulat, Bernhard Mistlberger, Andrea Pelloni | Differential Higgs production at N3LO beyond threshold | 12 plots and 1 Feynman Diagram | null | 10.1007/JHEP01(2018)145 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present several key steps towards the computation of differential Higgs
boson cross sections at N$^3$LO in perturbative QCD. Specifically, we work in
the framework of Higgs-differential cross sections that allows to compute
precise predictions for realistic LHC observables. We demonstrate how to
perform an expansion of the analytic N$^3$LO coefficient functions around the
production threshold of the Higgs boson. Our framework allows us to compute to
arbitrarily high order in the threshold expansion and we explicitly obtain the
first two expansion coefficients in analytic form. Furthermore, we assess the
phenomenological viability of threshold expansions for differential
distributions. In addition, we report on an interesting obstacle for the
computation of N$^3$LO corrections with LHAPDF parton distribution functions
and our solution. We provide files containing the analytic expressions for the
partonic cross sections together with the arXiv submission.
| [
{
"created": "Mon, 9 Oct 2017 10:09:56 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 08:44:22 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Dulat",
"Falko",
""
],
[
"Mistlberger",
"Bernhard",
""
],
[
"Pelloni",
"Andrea",
""
]
] | We present several key steps towards the computation of differential Higgs boson cross sections at N$^3$LO in perturbative QCD. Specifically, we work in the framework of Higgs-differential cross sections that allows to compute precise predictions for realistic LHC observables. We demonstrate how to perform an expansion of the analytic N$^3$LO coefficient functions around the production threshold of the Higgs boson. Our framework allows us to compute to arbitrarily high order in the threshold expansion and we explicitly obtain the first two expansion coefficients in analytic form. Furthermore, we assess the phenomenological viability of threshold expansions for differential distributions. In addition, we report on an interesting obstacle for the computation of N$^3$LO corrections with LHAPDF parton distribution functions and our solution. We provide files containing the analytic expressions for the partonic cross sections together with the arXiv submission. |
hep-ph/9804259 | Subhendra Mohanty | Subhendra Mohanty and Utpal Sarkar | Constraints on background torsion field from K physics | 12 pages latex file | Phys.Lett. B433 (1998) 424-428 | 10.1016/S0370-2693(98)00735-7 | IC/98/34 | hep-ph | null | We point out that a background torsion field will produce an effective
potential to the $K$ and $\bar{K}$ with opposite signs. This allows us to
constrain the background torsion field from the $K_L$ and $K_S$ mass
difference, CPT violating $K^\circ$ and $\bar{K^\circ}$ mass difference and the
CP violating quantities $\epsilon$ and $\eta_{+-}$. The most stringent bound on
the cosmological background torsion $< T^0 > < 10^{-25}$ GeV comes from the
direct measurement of the CPT violation.
| [
{
"created": "Wed, 8 Apr 1998 14:10:33 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Mohanty",
"Subhendra",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We point out that a background torsion field will produce an effective potential to the $K$ and $\bar{K}$ with opposite signs. This allows us to constrain the background torsion field from the $K_L$ and $K_S$ mass difference, CPT violating $K^\circ$ and $\bar{K^\circ}$ mass difference and the CP violating quantities $\epsilon$ and $\eta_{+-}$. The most stringent bound on the cosmological background torsion $< T^0 > < 10^{-25}$ GeV comes from the direct measurement of the CPT violation. |
1009.0177 | Paolo Lodone | Paolo Lodone | Can the Supersymmetric Flavour Problem decouple in case of a Non
Standard Supersymmetric Spectrum? | 4 pages, 5 figures. Review of 1004.2256 to appear in the Proceedings
of ICHEP 2010, Paris | PoS ICHEP2010:403,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that, in the context of the MSSM, the Supersymmetric
Flavour Problem cannot be solved by just letting the sfermions of the first two
generations be relatively heavy. The reason is twofold: naturalness of the
Fermi scale on one side, need for positive squared stop masses on the other.
The situation is much more promising in models without a light Higgs boson, in
which the goal can be met. The prices are: a relatively low messenger scale,
semiperturbativity before the GUT scale, and some amount of
degeneracy/alignement of order of the Cabibbo angle in the sfermion sector. A
crucial role is played by the increased quartic coupling. The resulting
phenomenology is quite different from the MSSM one in many respects.
| [
{
"created": "Wed, 1 Sep 2010 13:31:08 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Lodone",
"Paolo",
""
]
] | It has been shown that, in the context of the MSSM, the Supersymmetric Flavour Problem cannot be solved by just letting the sfermions of the first two generations be relatively heavy. The reason is twofold: naturalness of the Fermi scale on one side, need for positive squared stop masses on the other. The situation is much more promising in models without a light Higgs boson, in which the goal can be met. The prices are: a relatively low messenger scale, semiperturbativity before the GUT scale, and some amount of degeneracy/alignement of order of the Cabibbo angle in the sfermion sector. A crucial role is played by the increased quartic coupling. The resulting phenomenology is quite different from the MSSM one in many respects. |
1408.6329 | Hiranmaya Mishra | Guru Prakash Kadam, Hiranmaya Mishra | Bulk and shear viscosities of hot and dense hadron gas | 12 pages with 14 figures | null | 10.1016/j.nuclphysa.2014.12.004 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate bulk and shear viscosity at finite temperature and baryon
densities of hadronic matter within hadron resonance gas model. For bulk
viscosity we use low energy theorems of QCD for the energy momentum tensor
correlators. For shear viscosity coefficient, we estimate the same using
molecular kinetic theory to relate the shear viscosity coefficient to average
momentum of the hadrons in the hot and dense hadron gas. The bulk viscosity to
entropy ratio increases with chemical potential and is related to the reduction
of velocity of sound at nonzero chemical potential. The shear viscosity to
entropy ratio on the other hand, shows a nontrivial behavior with the ratio
decreasing with chemical potential for small temperatures but increasing with
chemical potential at high temperatures and is related to decrease of entropy
density with chemical potential at high temperature due to finite volume of the
hadrons.
| [
{
"created": "Wed, 27 Aug 2014 06:51:00 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Kadam",
"Guru Prakash",
""
],
[
"Mishra",
"Hiranmaya",
""
]
] | We estimate bulk and shear viscosity at finite temperature and baryon densities of hadronic matter within hadron resonance gas model. For bulk viscosity we use low energy theorems of QCD for the energy momentum tensor correlators. For shear viscosity coefficient, we estimate the same using molecular kinetic theory to relate the shear viscosity coefficient to average momentum of the hadrons in the hot and dense hadron gas. The bulk viscosity to entropy ratio increases with chemical potential and is related to the reduction of velocity of sound at nonzero chemical potential. The shear viscosity to entropy ratio on the other hand, shows a nontrivial behavior with the ratio decreasing with chemical potential for small temperatures but increasing with chemical potential at high temperatures and is related to decrease of entropy density with chemical potential at high temperature due to finite volume of the hadrons. |
hep-ph/0510340 | Marc-Thomas Eisele | Florian Bauer, Marc-Thomas Eisele, Mathias Garny | Leptonic Dark Energy and Baryogenesis | 10 pages, 5 figures, refs. added, matches published version | Phys.Rev.D74:023509,2006 | 10.1103/PhysRevD.74.023509 | TUM-HEP-603/05 | hep-ph astro-ph | null | We consider a baryogenesis scenario, where the difference of baryon (B) and
lepton (L) number is conserved in such a way that the B-L asymmetry in the
standard model sector is compensated by an asymmetry of opposite sign stored in
the dark energy sector. Therefore, we introduce a toy-model in which a complex
quintessence field carries a B-L asymmetry at late times. We determine the
produced baryon asymmetry in the visible sector for a large range of initial
conditions and find it easy to achieve a value of the observed order of
magnitude. While the size of the produced baryon asymmetry depends on details
of the underlying inflationary model, it turns out to be independent of the
reheating temperature in many cases. We also discuss possible sources of
instability like the formation of Q-Balls.
| [
{
"created": "Wed, 26 Oct 2005 15:02:01 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2006 14:37:54 GMT",
"version": "v2"
}
] | 2010-11-26 | [
[
"Bauer",
"Florian",
""
],
[
"Eisele",
"Marc-Thomas",
""
],
[
"Garny",
"Mathias",
""
]
] | We consider a baryogenesis scenario, where the difference of baryon (B) and lepton (L) number is conserved in such a way that the B-L asymmetry in the standard model sector is compensated by an asymmetry of opposite sign stored in the dark energy sector. Therefore, we introduce a toy-model in which a complex quintessence field carries a B-L asymmetry at late times. We determine the produced baryon asymmetry in the visible sector for a large range of initial conditions and find it easy to achieve a value of the observed order of magnitude. While the size of the produced baryon asymmetry depends on details of the underlying inflationary model, it turns out to be independent of the reheating temperature in many cases. We also discuss possible sources of instability like the formation of Q-Balls. |
2303.12119 | Johannes Hamre Isaksen | Johannes Hamre Isaksen, Konrad Tywoniuk | Precise description of medium-induced emissions | 51 pages, 14 figures | J. High Energ. Phys. 2023, 49 (2023) | 10.1007/JHEP09(2023)049 | null | hep-ph hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study jet fragmentation via final-state parton splittings in the medium.
These processes are usually calculated theoretically by invoking the
large-$N_c$ limit. In this paper we perform the first computation of a $1\to2$
parton splitting in a thermal medium at finite numbers of colors $N_c$, for
arbitrary momentum-sharing fraction $z$ and with full transverse dynamics. We
show how the problem can be transformed into a system of coupled Schr\"odinger
equations, that we solve numerically. The novel numerical results are used to
estimate the accuracy of several widely used approximations. We check the error
introduced while going from finite $N_c$ (i.e. $N_c =3$) to the large-$N_c$
limit, which we find to be small. For unbalanced splittings, e.g. when $z\to
0$, only one of the partons is affected by transverse momentum exchanges with
the medium. The emission process then separates into a term responsible for the
$1 \to 2$ splitting and the subsequent independent broadening of the daughter
partons. This is also referred to as the factorizable term. For finite $z$,
further contributions arise that are responsible for the coherent color
dynamics of the two-parton system, and these are referred to as
non-factorizable terms. These were argued to be small for soft (unbalanced)
splittings and for large media. In this work we therefore determine the
accuracy of keeping only the factorizable term of the large-$N_c$ solution. We
find that the error is insignificant at a small splitting fraction $z \sim 0$,
but can be sizable in a more balanced splitting with $z\sim 0.5$. Finally, we
also examine the eikonal approximation, which amounts to approximating the
partons' paths through the medium as straight lines. We find that it is
associated with a substantial error for the parameter values we explored in
this work.
| [
{
"created": "Tue, 21 Mar 2023 18:14:40 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Sep 2023 10:54:42 GMT",
"version": "v2"
}
] | 2023-09-12 | [
[
"Isaksen",
"Johannes Hamre",
""
],
[
"Tywoniuk",
"Konrad",
""
]
] | We study jet fragmentation via final-state parton splittings in the medium. These processes are usually calculated theoretically by invoking the large-$N_c$ limit. In this paper we perform the first computation of a $1\to2$ parton splitting in a thermal medium at finite numbers of colors $N_c$, for arbitrary momentum-sharing fraction $z$ and with full transverse dynamics. We show how the problem can be transformed into a system of coupled Schr\"odinger equations, that we solve numerically. The novel numerical results are used to estimate the accuracy of several widely used approximations. We check the error introduced while going from finite $N_c$ (i.e. $N_c =3$) to the large-$N_c$ limit, which we find to be small. For unbalanced splittings, e.g. when $z\to 0$, only one of the partons is affected by transverse momentum exchanges with the medium. The emission process then separates into a term responsible for the $1 \to 2$ splitting and the subsequent independent broadening of the daughter partons. This is also referred to as the factorizable term. For finite $z$, further contributions arise that are responsible for the coherent color dynamics of the two-parton system, and these are referred to as non-factorizable terms. These were argued to be small for soft (unbalanced) splittings and for large media. In this work we therefore determine the accuracy of keeping only the factorizable term of the large-$N_c$ solution. We find that the error is insignificant at a small splitting fraction $z \sim 0$, but can be sizable in a more balanced splitting with $z\sim 0.5$. Finally, we also examine the eikonal approximation, which amounts to approximating the partons' paths through the medium as straight lines. We find that it is associated with a substantial error for the parameter values we explored in this work. |
1312.3969 | Brian C. Tiburzi | Jong-Wan Lee, Brian C. Tiburzi | Background Electromagnetic Fields and NRQED Matching: Scalar Case | 15 pages | Phys. Rev. D 89, 054017 (2014) | 10.1103/PhysRevD.89.054017 | RBRC-1054 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The low-energy structure of hadrons can be described systematically using
effective field theory, and the parameters of the effective theory can be
determined from lattice QCD computations. Recent work, however, points to
inconsistencies between the background field method in lattice QCD and
effective field theory matching conditions. We show that the background field
problem necessitates inclusion of operators related by equations of motion. In
the presence of time-dependent electromagnetic fields, for example, such
operators modify Green's functions, thereby complicating the isolation of
hadronic parameters which enter on-shell scattering amplitudes. The
particularly simple case of a scalar hadron coupled to uniform electromagnetic
fields is investigated in detail. At the level of the relativistic effective
theory, operators related by equations of motion are demonstrated to be
innocuous. The same result does not hold in the non-relativistic effective
theory, and inconsistencies in matching are resolved by carefully treating
operators related by equations of motion. As uniform external fields
potentially allow for surface terms, the problem is additionally analyzed on a
torus where such terms are absent. Finite-size corrections are derived for
charged scalar correlation functions in uniform electric fields as a useful
byproduct.
| [
{
"created": "Fri, 13 Dec 2013 21:58:58 GMT",
"version": "v1"
}
] | 2014-03-26 | [
[
"Lee",
"Jong-Wan",
""
],
[
"Tiburzi",
"Brian C.",
""
]
] | The low-energy structure of hadrons can be described systematically using effective field theory, and the parameters of the effective theory can be determined from lattice QCD computations. Recent work, however, points to inconsistencies between the background field method in lattice QCD and effective field theory matching conditions. We show that the background field problem necessitates inclusion of operators related by equations of motion. In the presence of time-dependent electromagnetic fields, for example, such operators modify Green's functions, thereby complicating the isolation of hadronic parameters which enter on-shell scattering amplitudes. The particularly simple case of a scalar hadron coupled to uniform electromagnetic fields is investigated in detail. At the level of the relativistic effective theory, operators related by equations of motion are demonstrated to be innocuous. The same result does not hold in the non-relativistic effective theory, and inconsistencies in matching are resolved by carefully treating operators related by equations of motion. As uniform external fields potentially allow for surface terms, the problem is additionally analyzed on a torus where such terms are absent. Finite-size corrections are derived for charged scalar correlation functions in uniform electric fields as a useful byproduct. |
hep-ph/0312035 | Jose Emilio Ribeiro | J.E. Ribeiro | Chiral Symmetry and Resonances | 24 pages, 16 figures, uses pstricks and Tasy.sty. Talk at the
Conference "Time asymmetric Quantum Theory: The Theory of Resonances", Lisbon
July 2003 | null | null | null | hep-ph | null | A review on the requirements of chiral symmetry on effective quark models is
presented. The connection between the pion Salpeter amplitude and the mass gap
equation is discussed. Hadronic scattering, notably, $\pi\pi$ scattering is
presented. The constraints imposed by chiral symmetry between difractive quark
scattering and quark-quark annihilation is presented. Hadronic coupled channels
as a consequence of quark-quark annihilation are discussed together with the
$^3P_0$ mecahnism. Graphical-rules diagrams are intoduced as a means to
evaluate hadronic coupled channel transition potentials. Their role in finding
transition potentials responsible, in the scalar sector, for low energy
resonances, predicted long ago, and found recently, is also discussed.
| [
{
"created": "Tue, 2 Dec 2003 16:31:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ribeiro",
"J. E.",
""
]
] | A review on the requirements of chiral symmetry on effective quark models is presented. The connection between the pion Salpeter amplitude and the mass gap equation is discussed. Hadronic scattering, notably, $\pi\pi$ scattering is presented. The constraints imposed by chiral symmetry between difractive quark scattering and quark-quark annihilation is presented. Hadronic coupled channels as a consequence of quark-quark annihilation are discussed together with the $^3P_0$ mecahnism. Graphical-rules diagrams are intoduced as a means to evaluate hadronic coupled channel transition potentials. Their role in finding transition potentials responsible, in the scalar sector, for low energy resonances, predicted long ago, and found recently, is also discussed. |
hep-ph/0605054 | Bennie F. L. Ward | B. F. L. Ward (Department of Physics, Baylor University, Waco, Texas,
USA) | Planck Scale Remnants in Resummed Quantum Gravity | 9 pages, 2 figures; presented at 2006 Cracow Epiphany Conference;
improved text | Acta Phys.Polon. B37 (2006) 1967-1974 | null | BU-HEPP-06-05 | hep-ph | null | We show that, in a new approach to quantum gravity in which its UV behavior
is tamed by resummation of large IR effects, the final state of the Hawking
radiation for an originally very massive black hole is a Planck scale remnant
which is completely accessible to our universe. This remnant would be expected
to decay into n-body final states, leading to Planck scale cosmic rays.
| [
{
"created": "Thu, 4 May 2006 21:22:52 GMT",
"version": "v1"
},
{
"created": "Sat, 20 May 2006 16:18:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ward",
"B. F. L.",
"",
"Department of Physics, Baylor University, Waco, Texas,\n USA"
]
] | We show that, in a new approach to quantum gravity in which its UV behavior is tamed by resummation of large IR effects, the final state of the Hawking radiation for an originally very massive black hole is a Planck scale remnant which is completely accessible to our universe. This remnant would be expected to decay into n-body final states, leading to Planck scale cosmic rays. |
hep-ph/9509379 | Luca Silvestrini | E. Gabrielli, A. Masiero and L. Silvestrini | Flavour changing neutral currents and CP violating processes in
generalized supersymmetric theories | LaTeX, 17 pages, 3 uuencoded figures | Phys.Lett. B374 (1996) 80-86 | 10.1016/0370-2693(96)00158-X | ROME1 - 1109/95, ROM2F/95/20 | hep-ph | null | We consider supersymmetric extensions of the standard model with general
non-universal soft breaking terms. We analyse in a model-independent way the
constraints on these terms at the electroweak energy scale coming from gluino
mediated flavour (F) changing neutral current and CP-violating processes. We
have computed the complete $\Delta F=1$ and $\Delta F=2$ effective hamiltonian
for gluino mediated processes, including for the first time the effect of box
diagrams in the evaluation of $\epsilon^{\prime}/\epsilon$. We present
numerical results for the constraints on these non-universal soft breaking
terms for different values of the parameters, extending the analysis also to
the leptonic sector. A comparison with previous results in the literature is
given.
| [
{
"created": "Mon, 25 Sep 1995 15:06:33 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gabrielli",
"E.",
""
],
[
"Masiero",
"A.",
""
],
[
"Silvestrini",
"L.",
""
]
] | We consider supersymmetric extensions of the standard model with general non-universal soft breaking terms. We analyse in a model-independent way the constraints on these terms at the electroweak energy scale coming from gluino mediated flavour (F) changing neutral current and CP-violating processes. We have computed the complete $\Delta F=1$ and $\Delta F=2$ effective hamiltonian for gluino mediated processes, including for the first time the effect of box diagrams in the evaluation of $\epsilon^{\prime}/\epsilon$. We present numerical results for the constraints on these non-universal soft breaking terms for different values of the parameters, extending the analysis also to the leptonic sector. A comparison with previous results in the literature is given. |
1311.6472 | Pavel Fileviez Perez | Pavel Fileviez Perez, Hiren H. Patel | Baryon Asymmetry, Dark Matter and Local Baryon Number | to appear in Physics Letters B | Physics Letters B 731C (2014) 232-235 | 10.1016/j.physletb.2014.02.047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new mechanism to understand the relation between the baryon and
dark matter asymmetries in the universe in theories where the baryon number is
a local symmetry. In these scenarios the B-L asymmetry generated through a
mechanism such as leptogenesis is transferred to the dark matter and baryonic
sectors through sphalerons processes which conserve total baryon number. We
show that it is possible to have a consistent relation between the dark matter
relic density and the baryon asymmetry in the universe even if the baryon
number is broken at the low scale through the Higgs mechanism. We also discuss
the case where one uses the Stueckelberg mechanism to understand the
conservation of baryon number in nature.
| [
{
"created": "Mon, 25 Nov 2013 21:00:07 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Feb 2014 20:36:32 GMT",
"version": "v2"
}
] | 2014-03-11 | [
[
"Perez",
"Pavel Fileviez",
""
],
[
"Patel",
"Hiren H.",
""
]
] | We propose a new mechanism to understand the relation between the baryon and dark matter asymmetries in the universe in theories where the baryon number is a local symmetry. In these scenarios the B-L asymmetry generated through a mechanism such as leptogenesis is transferred to the dark matter and baryonic sectors through sphalerons processes which conserve total baryon number. We show that it is possible to have a consistent relation between the dark matter relic density and the baryon asymmetry in the universe even if the baryon number is broken at the low scale through the Higgs mechanism. We also discuss the case where one uses the Stueckelberg mechanism to understand the conservation of baryon number in nature. |
2404.02906 | Cari Cesarotti | Cari Cesarotti, Gordan Krnjaic | Hitting the Thermal Target for Leptophilic Dark Matter | 10 pages, 3 figures | null | null | MIT-CTP/5703, FERMILAB-PUB-24-0124-T | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study future lepton collider prospects for testing predictive models of
leptophilic dark matter candidates with a thermal origin. We calculate
experimental milestones for testing the parameter space compatible with
freeze-out and the associated collider signals at past, present, and future
facilities. This analysis places new limits on such models by leveraging the
utility of lepton colliders. At $e^+e^-$ machines, we make projections using
precision $Z$-pole observables from $e^+e^-\to l^+l^- + $ missing energy
signatures at LEP and future projections for FCC-ee in these channels.
Additionally, a muon collider could also probe new thermal relic parameter
space in this scenario via $\mu^+\mu^- \to X + $ missing energy where $X$ is
any easy identifiable SM object. Collectively, these processes can probe much
all of the parameter space for which DM direct annihilation to $l^+l^-$ yields
the observed relic density in Higgs-like models with mass-proportional
couplings to charged leptons.
| [
{
"created": "Wed, 3 Apr 2024 17:59:59 GMT",
"version": "v1"
}
] | 2024-04-04 | [
[
"Cesarotti",
"Cari",
""
],
[
"Krnjaic",
"Gordan",
""
]
] | We study future lepton collider prospects for testing predictive models of leptophilic dark matter candidates with a thermal origin. We calculate experimental milestones for testing the parameter space compatible with freeze-out and the associated collider signals at past, present, and future facilities. This analysis places new limits on such models by leveraging the utility of lepton colliders. At $e^+e^-$ machines, we make projections using precision $Z$-pole observables from $e^+e^-\to l^+l^- + $ missing energy signatures at LEP and future projections for FCC-ee in these channels. Additionally, a muon collider could also probe new thermal relic parameter space in this scenario via $\mu^+\mu^- \to X + $ missing energy where $X$ is any easy identifiable SM object. Collectively, these processes can probe much all of the parameter space for which DM direct annihilation to $l^+l^-$ yields the observed relic density in Higgs-like models with mass-proportional couplings to charged leptons. |
hep-ph/9610282 | V. V. Gubin | N.N. Achasov (1), V.V. Gubin (1), E.P. Solodov (2) ((1) S.L. Sobolev
Institute for Mathematics, Novosibirsk,(2) Budker Institute for Nuclear
Physics, Novosibirsk) | The interference in the reaction $e^+e^-\to\gamma\pi^+\pi^-$ and the
search for the decay $\phi\to\gamma f_0\to\gamma\pi^+\pi^-$ | 21 pages, revtex, 8 ps files of figures | Phys.Rev.D55:2672-2682,1997 | 10.1103/PhysRevD.55.2672 | IM RAS SB NNA 6-96 | hep-ph | null | We describe the interference between amplitudes $e^+e^- \to \rho \to
\gamma\pi^+\pi^-$ and $e^+e^- \to \phi \to \gamma f_0 \to \gamma\pi^+\pi^-$,
where $f_0$ meson is considered in the frameworks of the four-quark model and
the model of the scalar $K\bar K$ molecule. The general expressions for the
differential cross section with the radiative corrections and two angle cuts
are given. The interference patterns are obtained in the spectrum of the
differential cross section by the energy of the photon and in the full cross
section by the energy of the beams.
| [
{
"created": "Tue, 8 Oct 1996 08:57:10 GMT",
"version": "v1"
}
] | 2010-11-15 | [
[
"Achasov",
"N. N.",
""
],
[
"Gubin",
"V. V.",
""
],
[
"Solodov",
"E. P.",
""
]
] | We describe the interference between amplitudes $e^+e^- \to \rho \to \gamma\pi^+\pi^-$ and $e^+e^- \to \phi \to \gamma f_0 \to \gamma\pi^+\pi^-$, where $f_0$ meson is considered in the frameworks of the four-quark model and the model of the scalar $K\bar K$ molecule. The general expressions for the differential cross section with the radiative corrections and two angle cuts are given. The interference patterns are obtained in the spectrum of the differential cross section by the energy of the photon and in the full cross section by the energy of the beams. |
1107.5970 | Matthias Steinhauser | Andrey G.Grozin, Maik Hoeschele, Jens Hoff, Matthias Steinhauser | Simultaneous decoupling of bottom and charm quarks | 30 pages | null | 10.1007/JHEP09(2011)066 | SFB/CPP-11-32, TTP11-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the decoupling relations for the strong coupling, the light quark
masses, the gauge-fixing parameter, and the light fields in QCD with heavy
charm and bottom quarks to three-loop accuracy taking into account the exact
dependence on $m_c/m_b$. The application of a low-energy theorem allows the
extraction of the three-loop effective Higgs-gluon coupling valid for
extensions of the Standard Model with additional heavy quarks from the
decoupling constant of $\alpha_s$.
| [
{
"created": "Fri, 29 Jul 2011 13:51:37 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Grozin",
"Andrey G.",
""
],
[
"Hoeschele",
"Maik",
""
],
[
"Hoff",
"Jens",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We compute the decoupling relations for the strong coupling, the light quark masses, the gauge-fixing parameter, and the light fields in QCD with heavy charm and bottom quarks to three-loop accuracy taking into account the exact dependence on $m_c/m_b$. The application of a low-energy theorem allows the extraction of the three-loop effective Higgs-gluon coupling valid for extensions of the Standard Model with additional heavy quarks from the decoupling constant of $\alpha_s$. |
hep-ph/9605417 | D. Indumathi | D.Indumathi (Univ. Dortmund), Wei Zhu (CCAST, Beijing) | A Dynamical Model for Nuclear Structure Functions | 27 pages LaTeX, with 7 figures of encapsulated postscript files, to
appear in Z. Phys. C | Z.Phys. C74 (1997) 119-129 | 10.1007/s002880050375 | DO-TH-95/22 | hep-ph nucl-th | null | We construct a dynamical model for the parton distributions in a nucleus by
perturbative evolution of input distributions from a low starting scale. These
input distributions are obtained by modifications of the corresponding free
nucleon ones; the modifications being determined by standard nuclear physics
considerations. The model gives good agreement with existing data. Its
extension to the spin dependent case enables an estimation of nuclear
modifications to asymmetries observed in recent doubly polarised deep inelastic
scattering experiments. Although the structure functions themselves are very
different from the free nucleon ones, their ratio is insensitive to these
changes.
| [
{
"created": "Tue, 28 May 1996 16:37:07 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Indumathi",
"D.",
"",
"Univ. Dortmund"
],
[
"Zhu",
"Wei",
"",
"CCAST, Beijing"
]
] | We construct a dynamical model for the parton distributions in a nucleus by perturbative evolution of input distributions from a low starting scale. These input distributions are obtained by modifications of the corresponding free nucleon ones; the modifications being determined by standard nuclear physics considerations. The model gives good agreement with existing data. Its extension to the spin dependent case enables an estimation of nuclear modifications to asymmetries observed in recent doubly polarised deep inelastic scattering experiments. Although the structure functions themselves are very different from the free nucleon ones, their ratio is insensitive to these changes. |
1802.07758 | Simone Marzani | Marco Bonvini, Simone Marzani | Double resummation for Higgs production | 7 pages, 2 figures, 1 table. Version published in PRL | Phys. Rev. Lett. 120, 202003 (2018) | 10.1103/PhysRevLett.120.202003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first double-resummed prediction of the inclusive cross
section for the main Higgs production channel in proton-proton collisions,
namely gluon fusion. Our calculation incorporates to all orders in perturbation
theory two distinct towers of logarithmic corrections which are enhanced,
respectively, at threshold, i.e. large x, and in the high-energy limit, i.e.
small x. Large-x logarithms are resummed to next-to-next-to-next-to-leading
logarithmic accuracy, while small-x ones to leading logarithmic accuracy. The
double-resummed cross section is furthermore matched to the state-of-the-art
fixed-order prediction at next-to-next-to-next-to-leading accuracy. We find
that double resummation corrects the Higgs production rate by 2% at the
currently explored center-of-mass energy of 13 TeV and its impact reaches 10%
at future circular colliders at 100 TeV.
| [
{
"created": "Wed, 21 Feb 2018 19:21:41 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2018 09:13:17 GMT",
"version": "v2"
}
] | 2018-05-25 | [
[
"Bonvini",
"Marco",
""
],
[
"Marzani",
"Simone",
""
]
] | We present the first double-resummed prediction of the inclusive cross section for the main Higgs production channel in proton-proton collisions, namely gluon fusion. Our calculation incorporates to all orders in perturbation theory two distinct towers of logarithmic corrections which are enhanced, respectively, at threshold, i.e. large x, and in the high-energy limit, i.e. small x. Large-x logarithms are resummed to next-to-next-to-next-to-leading logarithmic accuracy, while small-x ones to leading logarithmic accuracy. The double-resummed cross section is furthermore matched to the state-of-the-art fixed-order prediction at next-to-next-to-next-to-leading accuracy. We find that double resummation corrects the Higgs production rate by 2% at the currently explored center-of-mass energy of 13 TeV and its impact reaches 10% at future circular colliders at 100 TeV. |
hep-ph/9306216 | Sanghyeon Chang | Sanghyeon Chang, Kiwoon Choi | Hadronic axion window and the big-bang nucleosynthesis | 14pages | Phys.Lett.B316:51-56,1993 | 10.1016/0370-2693(93)90656-3 | SNUTP 93-11 | hep-ph astro-ph | null | Hadronic axions with the decay constant $f_a\simeq 10^{6}$ GeV may fulfill
all astrophysical and laboratory constraints discussed so far. In this paper,
we reexamine the possibility of the hadronic axion window while taking into
account the uncertainties of some parameters describing low energy axion
dynamics. It is found that $f_a$ in the range from $3\times 10^5$ GeV to
$3\times 10^6$ can not be excluded by existing arguments. We then examine the
implication of this hadronic axion window for the big-bang nucleosynthesis (NS)
by evaluating the energy density of thermal axions at the nucleosynthesis
epoch. Our analysis yields $(\rho_a/\rho_{\nu})_{NS}=0.4\sim 0.5$ which exceeds
slightly the current best bound $(\rho_a/\rho_{\nu})_{NS}\leq 0.3$.
| [
{
"created": "Thu, 3 Jun 1993 05:04:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chang",
"Sanghyeon",
""
],
[
"Choi",
"Kiwoon",
""
]
] | Hadronic axions with the decay constant $f_a\simeq 10^{6}$ GeV may fulfill all astrophysical and laboratory constraints discussed so far. In this paper, we reexamine the possibility of the hadronic axion window while taking into account the uncertainties of some parameters describing low energy axion dynamics. It is found that $f_a$ in the range from $3\times 10^5$ GeV to $3\times 10^6$ can not be excluded by existing arguments. We then examine the implication of this hadronic axion window for the big-bang nucleosynthesis (NS) by evaluating the energy density of thermal axions at the nucleosynthesis epoch. Our analysis yields $(\rho_a/\rho_{\nu})_{NS}=0.4\sim 0.5$ which exceeds slightly the current best bound $(\rho_a/\rho_{\nu})_{NS}\leq 0.3$. |
hep-ph/0407292 | Boris Kerbikov | B. Kerbikov | Klein-Gordon Equation for Quark Pairs in Color Superconductor | 4 pages, no figures | Phys.Atom.Nucl. 68 (2005) 890-891; Yad.Fiz. 68 (2005) 925-926 | 10.1134/1.1935020 | null | hep-ph cond-mat.supr-con | null | The wave equation is derived for quark pairs in color superconductor in the
regime of low density / strong coupling.
| [
{
"created": "Mon, 26 Jul 2004 10:52:14 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 2004 15:43:30 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kerbikov",
"B.",
""
]
] | The wave equation is derived for quark pairs in color superconductor in the regime of low density / strong coupling. |
1502.04293 | Renata Jora | Renata Jora | Abelian Higgs model and its phase transitions revisited | 6 pages, version publsihed | Rom. Rep. Phys. 69, 106 (2017) | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The abelian Higgs model and its phase structure are discussed from the
perspective that the gauge and scalar fields admit a dual description in terms
of fermion variables. The results which indicate the presence of three main
phases: Coulomb, Higgs and confinement agree well with those in the literature
although a nonstandard order parameter is employed.
| [
{
"created": "Sun, 15 Feb 2015 08:52:24 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jun 2017 11:28:31 GMT",
"version": "v2"
}
] | 2017-06-12 | [
[
"Jora",
"Renata",
""
]
] | The abelian Higgs model and its phase structure are discussed from the perspective that the gauge and scalar fields admit a dual description in terms of fermion variables. The results which indicate the presence of three main phases: Coulomb, Higgs and confinement agree well with those in the literature although a nonstandard order parameter is employed. |
hep-ph/9707450 | Christopher Kolda | Christopher Kolda (Institute for Advanced Study, Princeton) | Gauge-Mediated Supersymmetry Breaking: Introduction, Review and Update | Talk given at the 5th International Conference on Supersymmetries in
Physics (SUSY-97), Philadelphia, PA, May 27-31, 1997. 10 pages LaTeX.
Requires espcrc2.sty file | Nucl.Phys.Proc.Suppl. 62 (1998) 266-275 | 10.1016/S0920-5632(97)00667-1 | IASSNS-HEP-97/90 | hep-ph | null | Recent progress in the gauge-mediated supersymmetry breaking is reviewed,
with emphasis on the theoretical problems which gauge-mediated models so
successfully solve, as well as those problems which are endemic to the models
themselves and still beguile theorists today.
| [
{
"created": "Thu, 24 Jul 1997 15:38:11 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kolda",
"Christopher",
"",
"Institute for Advanced Study, Princeton"
]
] | Recent progress in the gauge-mediated supersymmetry breaking is reviewed, with emphasis on the theoretical problems which gauge-mediated models so successfully solve, as well as those problems which are endemic to the models themselves and still beguile theorists today. |
hep-ph/0612141 | Jihn E. Kim | Jihn E. Kim | Axions: Past, Present, and Future | 15 pages with 6 figures. Talk at IDM 2006 | null | 10.1142/9789812770288_0049 | SNUTP 06-013 | hep-ph | null | The current status of axion physics is presented. There still exists the
axion window 10^9 GeV < F_a < 10^{12} GeV. The recent CAST solar axion search
experiment on the axion-photon-photon coupling strength has to be improved by a
factor of 100 to reach down to the region of superstring axions. The calculable
theta and m_u=0 cases for strong CP solutions, and axino cosmology in SUSY
extension of axion are also commented.
| [
{
"created": "Tue, 12 Dec 2006 02:16:13 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Kim",
"Jihn E.",
""
]
] | The current status of axion physics is presented. There still exists the axion window 10^9 GeV < F_a < 10^{12} GeV. The recent CAST solar axion search experiment on the axion-photon-photon coupling strength has to be improved by a factor of 100 to reach down to the region of superstring axions. The calculable theta and m_u=0 cases for strong CP solutions, and axino cosmology in SUSY extension of axion are also commented. |
hep-ph/0603032 | Nicolas Matagne SE | N. Matagne, Fl. Stancu | Matrix Elements of SU(6) Generators for Baryons at Arbitrary $N_c$ | 20 pages, 1 table, RevTeX4, version accepted for publication in Phys.
Rev. D | Phys.Rev. D73 (2006) 114025 | 10.1103/PhysRevD.73.114025 | null | hep-ph | null | We present explicit formulas for the matrix elements of the SU(6) generators
for totally symmetric spin-flavor states, relevant for baryon spectroscopy in
large $N_c$ QCD. We rely on the interplay between two different methods to
calculate these matrix elements. As an outcome, general analytic formulas of
the corresponding SU(6) isoscalar factors are derived for arbitrary $N_c$.
These results can be used to study excited states of nonstrange and strange
baryons.
| [
{
"created": "Fri, 3 Mar 2006 15:58:31 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Mar 2006 17:44:31 GMT",
"version": "v2"
},
{
"created": "Wed, 3 May 2006 13:14:29 GMT",
"version": "v3"
},
{
"created": "Tue, 20 Jun 2006 15:09:46 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Matagne",
"N.",
""
],
[
"Stancu",
"Fl.",
""
]
] | We present explicit formulas for the matrix elements of the SU(6) generators for totally symmetric spin-flavor states, relevant for baryon spectroscopy in large $N_c$ QCD. We rely on the interplay between two different methods to calculate these matrix elements. As an outcome, general analytic formulas of the corresponding SU(6) isoscalar factors are derived for arbitrary $N_c$. These results can be used to study excited states of nonstrange and strange baryons. |
hep-ph/0210056 | Santi Peris | S. Peris (UAB) | Electroweak Penguins and Large Nc | 4 pages. To appear in the Proceedings of the XIV Rencontres de Blois
"Matter-Antimatter Asymmetry", Blois, France June 16-22, 2002 | null | null | null | hep-ph | null | I review the progress made in the calculation of the electroweak penguins
Q_{7,8} in the framework of the Hadronic Approximation to large-Nc QCD, and
give an update of results.
| [
{
"created": "Thu, 3 Oct 2002 13:23:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Peris",
"S.",
"",
"UAB"
]
] | I review the progress made in the calculation of the electroweak penguins Q_{7,8} in the framework of the Hadronic Approximation to large-Nc QCD, and give an update of results. |
1508.00356 | Aparajita Bhattacharya | R.Ghosh, A. Bhattacharya, B.Chakrabarti | The masses of $P_{c}^{*}(4380)$ and $P_{c}^{*}(4450)$ in the quasi
particle diquark model | null | Physics of Elementary Particle and Atomic Nuclei Letters 14(4),
550-552 (2017) | 10.1134/S1547477117040100 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The masses of the recently reported by LHCb two pentaquark charmonium states
$P_{c}^{*}(4380)$ and $P_{c}^{*}(4450)$ which are supposed to have the
configuration $(uudc\overline{c})$ have been estimated in the framework of the
quasiparticle model of diquarks considering $[ud][uc]\overline{c}$
configuration. The masses are reproduced very well which indicates that the
description of diquark as quasiparticle is very useful for describing
multiquark state and to understand the dynamics of it.
| [
{
"created": "Mon, 3 Aug 2015 09:38:24 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Ghosh",
"R.",
""
],
[
"Bhattacharya",
"A.",
""
],
[
"Chakrabarti",
"B.",
""
]
] | The masses of the recently reported by LHCb two pentaquark charmonium states $P_{c}^{*}(4380)$ and $P_{c}^{*}(4450)$ which are supposed to have the configuration $(uudc\overline{c})$ have been estimated in the framework of the quasiparticle model of diquarks considering $[ud][uc]\overline{c}$ configuration. The masses are reproduced very well which indicates that the description of diquark as quasiparticle is very useful for describing multiquark state and to understand the dynamics of it. |
hep-ph/9908208 | Zurab Silagadze | Z.K. Silagadze | Mirror World versus large extra dimensions | 12 pages, no figures, LaTeX, some typos corrected. Published in Mod.
Phys. Lett. A14 (1999) 2321-2328 | Mod.Phys.Lett.A14:2321-2328,1999 | 10.1142/S0217732399002406 | null | hep-ph astro-ph | null | Recently proposed low scale quantum gravity scenario is expected to have a
significant impact on the Mirror World hypothesis. Some aspects of this
influence is investigated here, assuming that the fundamental gravity scale is
near a TeV. It is shown that future colliders will be capable to produce the
mirror matter, but an experimental signature, which will distinguish such
events from the background, is unclear. The `smoking gun'' signals of the
Mirror World would be an observation of decays like $\Upsilon(2S)\to \tilde
\chi_{b2} \gamma $. But unfortunately the expected branching ratios are very
small. Finally, it is shown that a mirror supernova will be quite a spectacular
event for our world too, because a considerable amount of ordinary energy is
expected to be emitted in the first several seconds.
| [
{
"created": "Mon, 2 Aug 1999 15:48:07 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 1999 07:21:28 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Sep 1999 14:13:05 GMT",
"version": "v3"
},
{
"created": "Tue, 23 May 2000 05:13:58 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Silagadze",
"Z. K.",
""
]
] | Recently proposed low scale quantum gravity scenario is expected to have a significant impact on the Mirror World hypothesis. Some aspects of this influence is investigated here, assuming that the fundamental gravity scale is near a TeV. It is shown that future colliders will be capable to produce the mirror matter, but an experimental signature, which will distinguish such events from the background, is unclear. The `smoking gun'' signals of the Mirror World would be an observation of decays like $\Upsilon(2S)\to \tilde \chi_{b2} \gamma $. But unfortunately the expected branching ratios are very small. Finally, it is shown that a mirror supernova will be quite a spectacular event for our world too, because a considerable amount of ordinary energy is expected to be emitted in the first several seconds. |
hep-ph/0311023 | Alan D. Martin | A.B. Kaidalov, V.A. Khoze, A.D. Martin and M.G. Ryskin | Extending the study of the Higgs sector at the LHC by proton tagging | 16 pages, 5 figures, version submitted to EPJC (Fig.2 slightly
modified) | Eur.Phys.J.C33:261-271,2004 | 10.1140/epjc/s2003-01566-8 | IPPP/03/51, DCPT/03/102 | hep-ph | null | We show that forward proton tagging may significantly enlarge the potential
of studying the Higgs sector at the LHC. We concentrate on Higgs production via
central exclusive diffractive processes (CEDP). Particular attention is paid to
regions in the MSSM parameter space where the partial width of the Higgs boson
decay into two gluons much exceeds the SM case; here the CEDP are found to have
special advantages.
| [
{
"created": "Mon, 3 Nov 2003 14:42:56 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2003 10:43:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kaidalov",
"A. B.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We show that forward proton tagging may significantly enlarge the potential of studying the Higgs sector at the LHC. We concentrate on Higgs production via central exclusive diffractive processes (CEDP). Particular attention is paid to regions in the MSSM parameter space where the partial width of the Higgs boson decay into two gluons much exceeds the SM case; here the CEDP are found to have special advantages. |
1805.00227 | Alexander Smirnov | Roman N. Lee, Alexander V. Smirnov, Vladimir A. Smirnov | Evaluating `elliptic' master integrals at special kinematic values:
using differential equations and their solutions via expansions near singular
points | Discussion extended | null | 10.1007/JHEP07(2018)102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a sequel of our previous paper where we described an algorithm to
find a solution of differential equations for master integrals in the form of
an $\epsilon$-expansion series with numerical coefficients. The algorithm is
based on using generalized power series expansions near singular points of the
differential system, solving difference equations for the corresponding
coefficients in these expansions and using matching to connect series
expansions at two neighboring points. Here we use our algorithm and the
corresponding code for our example of four-loop generalized sunset diagrams
with three massive and two massless propagators, in order to obtain new
analytical results. We analytically evaluate the master integrals at threshold,
$p^2=9 m^2$, in an expansion in $\epsilon$ up to $\epsilon^1$. With the help of
our code, we obtain numerical results for the threshold master integrals in an
$\epsilon$-expansion with the accuracy of 6000 digits and then use the PSLQ
algorithm to arrive at analytical values. Our basis of constants is build from
bases of multiple polylogarithm values at sixth roots of unity.
| [
{
"created": "Tue, 1 May 2018 08:03:42 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2018 12:18:52 GMT",
"version": "v2"
}
] | 2018-08-15 | [
[
"Lee",
"Roman N.",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
]
] | This is a sequel of our previous paper where we described an algorithm to find a solution of differential equations for master integrals in the form of an $\epsilon$-expansion series with numerical coefficients. The algorithm is based on using generalized power series expansions near singular points of the differential system, solving difference equations for the corresponding coefficients in these expansions and using matching to connect series expansions at two neighboring points. Here we use our algorithm and the corresponding code for our example of four-loop generalized sunset diagrams with three massive and two massless propagators, in order to obtain new analytical results. We analytically evaluate the master integrals at threshold, $p^2=9 m^2$, in an expansion in $\epsilon$ up to $\epsilon^1$. With the help of our code, we obtain numerical results for the threshold master integrals in an $\epsilon$-expansion with the accuracy of 6000 digits and then use the PSLQ algorithm to arrive at analytical values. Our basis of constants is build from bases of multiple polylogarithm values at sixth roots of unity. |
hep-ph/9708341 | Juergen Berges | J. Berges | Chiral Phase Transition from Non-Perturbative Flow Equations | 6 pages, Talk given at Eotvos Conference in Science: Strong and
Electroweak Matter, Eger, Hungary, 21-25 May 1997 | null | null | HD-THEP-97-42 | hep-ph | null | We employ non-perturbative flow equations to compute the equation of state
for two flavor QCD within an effective quark meson model. Our treatment covers
both the chiral perturbation theory domain of validity and the domain of
validity of universality associated with critical phenomena. In the vicinity of
$T_c$ and zero quark mass we obtain a precision estimate of the universal
critical equation of state of the three dimensional O(4) symmetric Heisenberg
model. For realistic quark masses the pion correlation length near $T_c$ turns
out to be smaller than its zero temperature value.
| [
{
"created": "Wed, 13 Aug 1997 15:02:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berges",
"J.",
""
]
] | We employ non-perturbative flow equations to compute the equation of state for two flavor QCD within an effective quark meson model. Our treatment covers both the chiral perturbation theory domain of validity and the domain of validity of universality associated with critical phenomena. In the vicinity of $T_c$ and zero quark mass we obtain a precision estimate of the universal critical equation of state of the three dimensional O(4) symmetric Heisenberg model. For realistic quark masses the pion correlation length near $T_c$ turns out to be smaller than its zero temperature value. |
1812.02719 | Sergei Demidov | S. Demidov, S. Gninenko and D. Gorbunov | Light hidden photon production in high energy collisions | 18 pages, a few references added, 1 figure added with the limits from
NA64 experiment in comparison with bounds from other searches. Version
accepted for publication in JHEP | null | 10.1007/JHEP07(2019)162 | INR-TH-2018-029 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The visible and dark sectors of particle physics can be connected via kinetic
mixing between ordinary and hidden photons. If the latter is light its
production in high energy collisions of ordinary particles proceeds via
oscillations with ordinary photons similarly to the neutrino processes.
Generically, the experiments are insensitive to mass of the hidden vector, if
it is lighter than 1\,MeV, and it does not decay into $e^+e^-$-pair. Still, one
can use the missing energy and scattering off the detector material as
signatures to search for the light vectors. Presence of media suppresses
production of the light vectors making the experiments insensitive to the
entire model. We present analytic formulas for the light hidden photon
production, propagation and detection valid for searches at colliders and
beam-target experiments and apply them to estimate the impact on the
sensitivities of a set of experiments --- NA64, FASER, MATHUSLA, SHiP, T2K,
DUNE, NA62 --- in a zero-background case.
| [
{
"created": "Thu, 6 Dec 2018 18:53:49 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2019 08:20:51 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Demidov",
"S.",
""
],
[
"Gninenko",
"S.",
""
],
[
"Gorbunov",
"D.",
""
]
] | The visible and dark sectors of particle physics can be connected via kinetic mixing between ordinary and hidden photons. If the latter is light its production in high energy collisions of ordinary particles proceeds via oscillations with ordinary photons similarly to the neutrino processes. Generically, the experiments are insensitive to mass of the hidden vector, if it is lighter than 1\,MeV, and it does not decay into $e^+e^-$-pair. Still, one can use the missing energy and scattering off the detector material as signatures to search for the light vectors. Presence of media suppresses production of the light vectors making the experiments insensitive to the entire model. We present analytic formulas for the light hidden photon production, propagation and detection valid for searches at colliders and beam-target experiments and apply them to estimate the impact on the sensitivities of a set of experiments --- NA64, FASER, MATHUSLA, SHiP, T2K, DUNE, NA62 --- in a zero-background case. |
hep-ph/0703313 | M. Haghighat | M. M. Ettefaghi and M. Haghighat | Lorentz Conserving Noncommutative Standard Model | 18 pages, 1 figure, to appear in Phys. Rev. D | Phys.Rev.D75:125002,2007 | 10.1103/PhysRevD.75.125002 | null | hep-ph hep-th | null | We consider Lorentz conserving noncommutative field theory to construct the
Lorentz conserving noncommutative standard model based on the gauge group
$SU(3)\times SU(2)\times U(1)$. We obtain the enveloping algebra-valued of
Higgs field up to the second order of the noncommutativity parameter
$\th_{\mu\nu}$. We derive the action at the leading order and find new vertices
which are absent in the ordinary Standard Model as well as the minimal
noncommutative standard model. We briefly study the phenomenological aspects of
the model.
| [
{
"created": "Thu, 29 Mar 2007 19:21:25 GMT",
"version": "v1"
},
{
"created": "Thu, 10 May 2007 16:41:40 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ettefaghi",
"M. M.",
""
],
[
"Haghighat",
"M.",
""
]
] | We consider Lorentz conserving noncommutative field theory to construct the Lorentz conserving noncommutative standard model based on the gauge group $SU(3)\times SU(2)\times U(1)$. We obtain the enveloping algebra-valued of Higgs field up to the second order of the noncommutativity parameter $\th_{\mu\nu}$. We derive the action at the leading order and find new vertices which are absent in the ordinary Standard Model as well as the minimal noncommutative standard model. We briefly study the phenomenological aspects of the model. |
2005.10593 | Ricardo Landim | Bjorn Garbrecht, Ricardo G. Landim | Fat brane and seesaw mechanism in extra dimensions | 28 pages, 11 figures, 1 table, references added, version accepted for
publication in PRD | Phys. Rev. D 102, 095004 (2020) | 10.1103/PhysRevD.102.095004 | TUM-HEP-1263/20 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a higher-dimensional seesaw mechanism. We consider a
single, flat extra dimension, where a fat brane is localized and contains the
standard model (SM) fields, similar to Universal Extra Dimension models. There
is only one Dirac fermion in the bulk, and in four dimensions it results in two
towers of Kaluza-Klein (KK) Majorana sterile neutrinos, whose mass mixing with
the SM neutrinos is suppressed due to a brane-localized kinetic term. The
interaction between the sterile neutrinos and the SM is through the usual
coupling with the Higgs boson, where the coupling depends upon the
compactification radius $R^{-1}=10^{-2}-1$ GeV and the width of the fat brane
$L^{-1}=2$ TeV, where the latter value is chosen to avoid LHC constraints. Due
to this suppression mechanism the mass of the lightest sterile neutrinos can be
of order $\mathcal{O}(1-10)$~\text{TeV} while naturally explaining the small SM
neutrino mass, which in turn is easily obtained for a large range of parameter
choices. Furthermore, neutrino oscillations are not substantially influenced by
the tower of sterile KK particles. Finally, leptogenesis is investigated in
this setup, and it is viable for some values within the parameter space.
| [
{
"created": "Thu, 21 May 2020 12:06:17 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Oct 2020 10:19:06 GMT",
"version": "v2"
}
] | 2020-11-11 | [
[
"Garbrecht",
"Bjorn",
""
],
[
"Landim",
"Ricardo G.",
""
]
] | In this paper we present a higher-dimensional seesaw mechanism. We consider a single, flat extra dimension, where a fat brane is localized and contains the standard model (SM) fields, similar to Universal Extra Dimension models. There is only one Dirac fermion in the bulk, and in four dimensions it results in two towers of Kaluza-Klein (KK) Majorana sterile neutrinos, whose mass mixing with the SM neutrinos is suppressed due to a brane-localized kinetic term. The interaction between the sterile neutrinos and the SM is through the usual coupling with the Higgs boson, where the coupling depends upon the compactification radius $R^{-1}=10^{-2}-1$ GeV and the width of the fat brane $L^{-1}=2$ TeV, where the latter value is chosen to avoid LHC constraints. Due to this suppression mechanism the mass of the lightest sterile neutrinos can be of order $\mathcal{O}(1-10)$~\text{TeV} while naturally explaining the small SM neutrino mass, which in turn is easily obtained for a large range of parameter choices. Furthermore, neutrino oscillations are not substantially influenced by the tower of sterile KK particles. Finally, leptogenesis is investigated in this setup, and it is viable for some values within the parameter space. |
hep-ph/0509123 | Takahiro Kubota | Masataka Fukugita and Takahiro Kubota | Radiative Corrections to the Neutrino-Deuteron Reactions | 4 pages, no figures, Revtex | Phys.Rev.D72:071301,2005; Erratum-ibid.D74:039906,2006 | 10.1103/PhysRevD.72.071301 10.1103/PhysRevD.74.039906 | OU-HET-541 | hep-ph | null | The $O(\alpha)$ QED and electroweak radiative corrections to neutrino
deuteron reactions is investigated with particular emphasis given to the
constant terms, which have not been treated properly in the literature. This
problem is related to the definition of the axial-vector coupling constant
$g_{A}$ as to the inclusion of radiative corrections. After proper calculations
of the constants for the Fermi and Gamow-Teller transitions, we find the
radiative correction to the neutral current induced reaction, with the usually
adopted definition of $g_{A}$, is 1.017 for the Higgs boson mass $m_{H}=1.5
m_{Z}$. This value is close to that given by Kurylov et al., but this is due to
an accidental cancellation of the errors, between those caused by putative
identification of constant terms for the Fermi and Gamow-Teller transitions for
the charged current reactions and minor errors in their treatment of the
constant terms for the neutral current induced reactions.
| [
{
"created": "Tue, 13 Sep 2005 03:55:50 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Fukugita",
"Masataka",
""
],
[
"Kubota",
"Takahiro",
""
]
] | The $O(\alpha)$ QED and electroweak radiative corrections to neutrino deuteron reactions is investigated with particular emphasis given to the constant terms, which have not been treated properly in the literature. This problem is related to the definition of the axial-vector coupling constant $g_{A}$ as to the inclusion of radiative corrections. After proper calculations of the constants for the Fermi and Gamow-Teller transitions, we find the radiative correction to the neutral current induced reaction, with the usually adopted definition of $g_{A}$, is 1.017 for the Higgs boson mass $m_{H}=1.5 m_{Z}$. This value is close to that given by Kurylov et al., but this is due to an accidental cancellation of the errors, between those caused by putative identification of constant terms for the Fermi and Gamow-Teller transitions for the charged current reactions and minor errors in their treatment of the constant terms for the neutral current induced reactions. |
1504.07175 | Joao Pacheco B. C. de Melo Dr. | J. P. B. C. de Melo, Anac\'e N. da Silva (Laborat\'orio de Fisica
Te\'orica e Computacional, LFTC, Universidade Cruzeiro do Sul, Sao Paulo,
Brazil, 01506-000), Clayton S. Mello (Departamento de F\'isica, Instituto
Tecnol\'ogico de Aeron\'autica, Centro T\'ecnico Aeroespacial, 12.228-900,
S\~ao Jos\'e dos Campos, Sao Paulo, Brazil and Laborat\'orio de F\'isica
Te\'orica e Computacional, LFTC, Universidade Cruzeiro do Sul, S\~ao Paulo,
Brazil, 01506-000) and T. Frederico (Departamento de F\'isica, Instituto
Tecnol\'ogico de Aeron\'autica, Centro T\'ecnico Aeroespacial, 12.228-900,
S\~ao Jos\'e dos Campos, S\~ao Paulo, Brazil) | Spin-1 Particles with Light-Front Approach | 5 pages. 3 Figures, use latex and EPJ style | EPJ Web Conf. 73 (2014) 03017 (
http://dx.doi.org/10.1051/epjconf/20147303017 ) | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the vector sector, i.e, mesons with spin-1, the electromagnetic form
factors and anothers observables are calculated with the light-front approach.
However, the light-front quantum field theory have some problems, for example,
the rotational symmetry breaking. We solve that problem added the zero modes
contribuition to the matrix elements of the electromagnetic current, besides
the valence contribuition. We found that among the four independent matrix
elements of the plus component in the light-front helicity basis only the $0\to
0$ one carries zero mode contributions.
| [
{
"created": "Mon, 27 Apr 2015 17:38:23 GMT",
"version": "v1"
}
] | 2015-04-28 | [
[
"de Melo",
"J. P. B. C.",
"",
"Laboratório de Fisica\n Teórica e Computacional, LFTC, Universidade Cruzeiro do Sul, Sao Paulo,\n Brazil, 01506-000"
],
[
"da Silva",
"Anacé N.",
"",
"Laboratório de Fisica\n Teórica e Computacional, LFTC, Universidade Cruzeiro do Sul, Sao Paul... | For the vector sector, i.e, mesons with spin-1, the electromagnetic form factors and anothers observables are calculated with the light-front approach. However, the light-front quantum field theory have some problems, for example, the rotational symmetry breaking. We solve that problem added the zero modes contribuition to the matrix elements of the electromagnetic current, besides the valence contribuition. We found that among the four independent matrix elements of the plus component in the light-front helicity basis only the $0\to 0$ one carries zero mode contributions. |
2211.06448 | Fabio Siringo | Fabio Siringo | Screened massive expansion of Schwinger-Dyson equations | null | Phys. Rev. D 107, 016009 (2023) | 10.1103/PhysRevD.107.016009 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general formal derivation of the screened massive expansion is provided by
Schwinger-Dyson equations. Some known issues of the expansion are clarified and
a more general framework is established for a natural extension of the method
to two-loop or to amplitudes which are not directly defined by a generating
functional. For instance, a one-loop screened expansion is given for the
effective gauge-parameter-independent gluon propagator which arises from the
pinch-technique.
| [
{
"created": "Fri, 11 Nov 2022 19:16:42 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Siringo",
"Fabio",
""
]
] | A general formal derivation of the screened massive expansion is provided by Schwinger-Dyson equations. Some known issues of the expansion are clarified and a more general framework is established for a natural extension of the method to two-loop or to amplitudes which are not directly defined by a generating functional. For instance, a one-loop screened expansion is given for the effective gauge-parameter-independent gluon propagator which arises from the pinch-technique. |
0709.2115 | Marco Guzzi | Alessandro Cafarella, Claudio Coriano, Marco Guzzi | NNLO Logarithmic Expansions and High Precision Determinations of the QCD
background at the LHC: The case of the Z resonance | 5 pages, 2 figures. Talk given at QCD@work 2007, Martina Franca,
Italy, 16-20 June 2007. To be published in the American Institute of Physics
(AIP) conference proceedings | AIP Conf.Proc.964:206-211,2007 | 10.1063/1.2823851 | null | hep-ph | null | New methods of solutions of the DGLAP equation and their implementation
through NNLO in QCD are briefly reviewed. We organize the perturbative
expansion that describes in $x$-space the evolved parton distributions in terms
of scale invariant functions, which are determined recursively, and logarithms
of the ratio of the running couplings at the initial and final evolution
scales. Resummed solutions are constructed within the same approach and involve
logarithms of more complex functions, which are given in the non-singlet case.
Differences in the evolution schemes are shown to be numerically sizeable and
intrinsic to perturbation theory. We illustrate these points in the case of
Drell-Yan lepton pair production near the Z resonance, analysis that can be
extended to searches of extra $Z^{\prime}$. We show that the reduction of the
NNLO cross section compared to the NLO prediction may be attributed to the NNLO
evolution.
| [
{
"created": "Thu, 13 Sep 2007 16:23:48 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2007 10:11:38 GMT",
"version": "v2"
}
] | 2008-12-30 | [
[
"Cafarella",
"Alessandro",
""
],
[
"Coriano",
"Claudio",
""
],
[
"Guzzi",
"Marco",
""
]
] | New methods of solutions of the DGLAP equation and their implementation through NNLO in QCD are briefly reviewed. We organize the perturbative expansion that describes in $x$-space the evolved parton distributions in terms of scale invariant functions, which are determined recursively, and logarithms of the ratio of the running couplings at the initial and final evolution scales. Resummed solutions are constructed within the same approach and involve logarithms of more complex functions, which are given in the non-singlet case. Differences in the evolution schemes are shown to be numerically sizeable and intrinsic to perturbation theory. We illustrate these points in the case of Drell-Yan lepton pair production near the Z resonance, analysis that can be extended to searches of extra $Z^{\prime}$. We show that the reduction of the NNLO cross section compared to the NLO prediction may be attributed to the NNLO evolution. |
hep-ph/0106083 | David Atwood | David Atwood, Amarjit Soni | Determining the Phases alpha and gamma from Direct CP Violation in B_u,
B_d and B_s Decays to Two Vectors | 12 pages, no figures | Phys.Rev.D65:073018,2002 | 10.1103/PhysRevD.65.073018 | Fermilab-Pub-01/104-T, BNL-HET-01/17 | hep-ph hep-ex | null | A method for clean determination of the unitarity angles alpha and gamma is
proposed that uses only direct CP violation and does not require any time
dependent measurements. The method takes advantage of helicity amplitudes for
B_u, B_d and B_s decay to two vector mesons and can be used, at any B-facility,
in conjunction with a large number of modes. It also allows for experimental
tests of theoretical approximations involved.
| [
{
"created": "Fri, 8 Jun 2001 02:31:57 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Atwood",
"David",
""
],
[
"Soni",
"Amarjit",
""
]
] | A method for clean determination of the unitarity angles alpha and gamma is proposed that uses only direct CP violation and does not require any time dependent measurements. The method takes advantage of helicity amplitudes for B_u, B_d and B_s decay to two vector mesons and can be used, at any B-facility, in conjunction with a large number of modes. It also allows for experimental tests of theoretical approximations involved. |
0906.2456 | Dmitri Diakonov | Dmitri Diakonov | Topology and confinement | Lectures at the ITEP Winter School (February 2009, Moscow) and
Schladming Winter School (March 2009, Schladming, Austria), 42 pages, 16
figures | Nucl.Phys.Proc.Suppl.195:5-45,2009 | 10.1016/j.nuclphysbps.2009.10.010 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lectures contain an introduction to instantons, calorons and dyons of
the Yang--Mills gauge theory. Since we are interested in the mechanism of
confinement and of the deconfinement phase transition at some critical
temperature, the Yang--Mills theory is formulated and studied at nonzero
temperatures. We introduce ``calorons with a nontrivial holonomy'' that are
generalizations of instantons and can be viewed as ``made of'' constituent
dyons. The quantum weight with which these calorons contribute to the
Yang--Mills partition function is considered, and the ensuing statistical
mechanics of the ensemble of interacting dyons is discussed. We argue that a
simple semiclassical picture based on dyons satisfies all known criteria of
confinement and explains the confinement-deconfinement phase transition. This
refers not only to the SU(N) gauge groups where dyons lead to the expected
behaviour of the observables with N, but also to the exceptional G(2) group
whose group center, unlike SU(N), is trivial. Despite being centerless, the
G(2) gauge group possesses confinement at low temperatures, and a 1st order
deconfinement transition, according to several latest lattice simulations,
indicating that confinement-deconfinement is not related to the group center.
Dyons, however, reproduce this behaviour.
| [
{
"created": "Mon, 15 Jun 2009 12:11:06 GMT",
"version": "v1"
}
] | 2009-12-04 | [
[
"Diakonov",
"Dmitri",
""
]
] | These lectures contain an introduction to instantons, calorons and dyons of the Yang--Mills gauge theory. Since we are interested in the mechanism of confinement and of the deconfinement phase transition at some critical temperature, the Yang--Mills theory is formulated and studied at nonzero temperatures. We introduce ``calorons with a nontrivial holonomy'' that are generalizations of instantons and can be viewed as ``made of'' constituent dyons. The quantum weight with which these calorons contribute to the Yang--Mills partition function is considered, and the ensuing statistical mechanics of the ensemble of interacting dyons is discussed. We argue that a simple semiclassical picture based on dyons satisfies all known criteria of confinement and explains the confinement-deconfinement phase transition. This refers not only to the SU(N) gauge groups where dyons lead to the expected behaviour of the observables with N, but also to the exceptional G(2) group whose group center, unlike SU(N), is trivial. Despite being centerless, the G(2) gauge group possesses confinement at low temperatures, and a 1st order deconfinement transition, according to several latest lattice simulations, indicating that confinement-deconfinement is not related to the group center. Dyons, however, reproduce this behaviour. |
2402.17820 | Anirudh Prabhu | Mariia Khelashvili, Mariangela Lisanti, Anirudh Prabhu, Benjamin R.
Safdi | An Axion Pulsarscope | 8+5 pages, 2 figures, video abstract at
https://www.youtube.com/watch?v=YRZW4tPtIDk | null | null | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electromagnetic fields surrounding pulsars may source coherent ultralight
axion signals at the known rotational frequencies of the neutron stars, which
can be detected by laboratory experiments (e.g., pulsarscopes). As a promising
case study, we model axion emission from the well-studied Crab pulsar, which
would yield a prominent signal at $f \approx 29.6$ Hz regardless of whether the
axion contributes to the dark matter abundance. We estimate the relevant
sensitivity of future axion dark matter detection experiments such as
DMRadio-GUT, Dark SRF, and CASPEr, assuming different magnetosphere models to
bracket the uncertainty in astrophysical modeling. For example, depending on
final experimental parameters, the Dark SRF experiment could probe axions with
any mass $m_a \ll 10^{-13}$ eV down to $g_{a\gamma\gamma} \sim 3 \times
10^{-13}$ GeV$^{-1}$ with one year of data and assuming the vacuum
magnetosphere model. These projected sensitivities may be degraded depending on
the extent to which the magnetosphere is screened by charge-filled plasma. The
promise of pulsar-sourced axions as a clean target for direct detection
experiments motivates dedicated simulations of axion production in pulsar
magnetospheres.
| [
{
"created": "Tue, 27 Feb 2024 19:00:00 GMT",
"version": "v1"
}
] | 2024-02-29 | [
[
"Khelashvili",
"Mariia",
""
],
[
"Lisanti",
"Mariangela",
""
],
[
"Prabhu",
"Anirudh",
""
],
[
"Safdi",
"Benjamin R.",
""
]
] | Electromagnetic fields surrounding pulsars may source coherent ultralight axion signals at the known rotational frequencies of the neutron stars, which can be detected by laboratory experiments (e.g., pulsarscopes). As a promising case study, we model axion emission from the well-studied Crab pulsar, which would yield a prominent signal at $f \approx 29.6$ Hz regardless of whether the axion contributes to the dark matter abundance. We estimate the relevant sensitivity of future axion dark matter detection experiments such as DMRadio-GUT, Dark SRF, and CASPEr, assuming different magnetosphere models to bracket the uncertainty in astrophysical modeling. For example, depending on final experimental parameters, the Dark SRF experiment could probe axions with any mass $m_a \ll 10^{-13}$ eV down to $g_{a\gamma\gamma} \sim 3 \times 10^{-13}$ GeV$^{-1}$ with one year of data and assuming the vacuum magnetosphere model. These projected sensitivities may be degraded depending on the extent to which the magnetosphere is screened by charge-filled plasma. The promise of pulsar-sourced axions as a clean target for direct detection experiments motivates dedicated simulations of axion production in pulsar magnetospheres. |
hep-ph/9407290 | Per Osland | Bjarte Kileng and Per Osland | Gluino Production in Electron-Positron Annihilation | 24 pages LATEX plus 10 pages of figures (not included, available on
request). Full postscript version available by anonymous ftp at node
VSFYS1.FI.UIB.NO in subdirectory OSLAND, file BERGEN94-10.PS), Bergen
Scientific/Technical Report No. 1994-10 | Z.Phys. C66 (1995) 503-512 | 10.1007/BF01556378 | null | hep-ph | null | We discuss the pair production of gluinos in electron-positron annihilation
at LEP, in a model with soft supersymmetry breaking, allowing for mixing
between the squarks. In much of the parameter space of the Minimal
Supersymmetric Model (MSSM) the cross section corresponds to a $Z$ branching
ratio above $10^{-5}$, even up to $10^{-4}$. A non-observation of gluinos at
this level restricts the allowed MSSM parameter space. In particular, it leads
to lower bounds on the soft mass parameters in the squark sector.
| [
{
"created": "Thu, 14 Jul 1994 10:25:53 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kileng",
"Bjarte",
""
],
[
"Osland",
"Per",
""
]
] | We discuss the pair production of gluinos in electron-positron annihilation at LEP, in a model with soft supersymmetry breaking, allowing for mixing between the squarks. In much of the parameter space of the Minimal Supersymmetric Model (MSSM) the cross section corresponds to a $Z$ branching ratio above $10^{-5}$, even up to $10^{-4}$. A non-observation of gluinos at this level restricts the allowed MSSM parameter space. In particular, it leads to lower bounds on the soft mass parameters in the squark sector. |
2405.12242 | T\'essio B. de Melo | Asmaa Abada, Nicol\'as Bernal, Antonio E. C\'arcamo Hern\'andez,
Sergey Kovalenko, T\'essio B. de Melo, Takashi Toma | Pheno & Cosmo Implications of Scotogenic 3-loop Neutrino Mass Models | 6 pages, 5 figures. Contribution to the 2024 Electroweak session of
the 58th Rencontres de Moriond | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative seesaw models are examples of interesting and testable extensions
of the Standard Model to explain the light neutrino masses. In radiative models
at 1-loop level, such as the popular scotogenic model, in order to successfully
reproduce neutrino masses and mixing, one has to rely either on unnaturally
small Yukawa couplings or on a very small mass splitting between the CP-even
and CP-odd components of the neutral scalar mediators. We discuss here
scotogenic-like models where light-active neutrino masses arise at the
three-loop level, providing a more natural explanation for their smallness. The
proposed models are consistent with the neutrino oscillation data and allow to
successfully accommodate the measured dark matter relic abundance. Depending on
the specific realization, it is also possible to explain the W-mass anomaly and
to generate the baryon asymmetry of the Universe via leptogenesis. The models
lead to rich phenomenology, predicting sizable charged-lepton flavor violation
rates, potentially observable in near future experiments, while satisfying all
current constraints imposed by neutrinoless double-beta decay, charged-lepton
flavor violation and electroweak precision observables.
| [
{
"created": "Fri, 17 May 2024 21:11:56 GMT",
"version": "v1"
}
] | 2024-05-22 | [
[
"Abada",
"Asmaa",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Hernández",
"Antonio E. Cárcamo",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"de Melo",
"Téssio B.",
""
],
[
"Toma",
"Takashi",
""
]
] | Radiative seesaw models are examples of interesting and testable extensions of the Standard Model to explain the light neutrino masses. In radiative models at 1-loop level, such as the popular scotogenic model, in order to successfully reproduce neutrino masses and mixing, one has to rely either on unnaturally small Yukawa couplings or on a very small mass splitting between the CP-even and CP-odd components of the neutral scalar mediators. We discuss here scotogenic-like models where light-active neutrino masses arise at the three-loop level, providing a more natural explanation for their smallness. The proposed models are consistent with the neutrino oscillation data and allow to successfully accommodate the measured dark matter relic abundance. Depending on the specific realization, it is also possible to explain the W-mass anomaly and to generate the baryon asymmetry of the Universe via leptogenesis. The models lead to rich phenomenology, predicting sizable charged-lepton flavor violation rates, potentially observable in near future experiments, while satisfying all current constraints imposed by neutrinoless double-beta decay, charged-lepton flavor violation and electroweak precision observables. |
1606.06528 | Rafal Maciula | Marta Luszczak, Rafal Maciula, Antoni Szczurek, and Maciej Trzebinski | Single-diffractive production of charmed mesons at the LHC within the
$k_t$-factorization approach | 21 pages, 14 figures | null | 10.1007/JHEP02(2017)089 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the single diffractive production of $c \bar c$ pairs and charmed
mesons at the LHC. For a first time we propose a $k_t$-factorization approach
to the diffractive processes. The transverse momentum dependent diffractive
parton distributions are obtained from standard (collinear) diffractive parton
distributions used in the literature. In this calculation the transverse
momentum of the pomeron is neglected with respect to transverse momentum of
partons entering the hard process. We also perform the first evaluation of the
cross sections at the LHC using the diffractive transverse momentum dependent
parton distributions. The results of the new approach are compared with those
of the standard collinear one. Significantly larger cross sections are obtained
in the $k_t$-factorization approach where some part of higher-order effects is
effectively included. The differences between corresponding differential
distributions are discussed. Finally, we present a feasibility study of the
process at the LHC using proton tagging technique. The analysis suggests that
the measurement of single diffractive charm production is possible using ATLAS
and CMS/TOTEM detectors.
| [
{
"created": "Tue, 21 Jun 2016 12:03:46 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Luszczak",
"Marta",
""
],
[
"Maciula",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
],
[
"Trzebinski",
"Maciej",
""
]
] | We discuss the single diffractive production of $c \bar c$ pairs and charmed mesons at the LHC. For a first time we propose a $k_t$-factorization approach to the diffractive processes. The transverse momentum dependent diffractive parton distributions are obtained from standard (collinear) diffractive parton distributions used in the literature. In this calculation the transverse momentum of the pomeron is neglected with respect to transverse momentum of partons entering the hard process. We also perform the first evaluation of the cross sections at the LHC using the diffractive transverse momentum dependent parton distributions. The results of the new approach are compared with those of the standard collinear one. Significantly larger cross sections are obtained in the $k_t$-factorization approach where some part of higher-order effects is effectively included. The differences between corresponding differential distributions are discussed. Finally, we present a feasibility study of the process at the LHC using proton tagging technique. The analysis suggests that the measurement of single diffractive charm production is possible using ATLAS and CMS/TOTEM detectors. |
1912.12086 | Arlene Cristina Aguilar | A. C. Aguilar, F. De Soto, M. N. Ferreira, J. Papavassiliou, J.
Rodr\'iguez-Quintero, S. Zafeiropoulos | Gluon propagator and three-gluon vertex with dynamical quarks | 32 pages, 10 figures | null | 10.1140/epjc/s10052-020-7741-0 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed analysis of the kinetic and mass terms associated with
the Landau gauge gluon propagator in the presence of dynamical quarks, and a
comprehensive dynamical study of certain special kinematic limits of the
three-gluon vertex. Our approach capitalizes on results from recent lattice
simulations with (2+1) domain wall fermions, a novel nonlinear treatment of the
gluon mass equation, and the nonperturbative reconstruction of the longitudinal
three-gluon vertex from its fundamental Slavnov-Taylor identities. Particular
emphasis is placed on the persistence of the suppression displayed by certain
combinations of the vertex form factors at intermediate and low momenta,
already known from numerous pure Yang-Mills studies. One of our central
findings is that the inclusion of dynamical quarks moderates the intensity of
this phenomenon only mildly, leaving the asymptotic low-momentum behavior
unaltered, but displaces the characteristic "zero crossing" deeper into the
infrared region. In addition, the effect of the three-gluon vertex is explored
at the level of the renormalization-group invariant combination corresponding
to the effective gauge coupling, whose size is considerably reduced with
respect to its counterpart obtained from the ghost-gluon vertex. The main
upshot of the above considerations is the further confirmation of the tightly
interwoven dynamics between the two- and three-point sectors of QCD.
| [
{
"created": "Fri, 27 Dec 2019 13:18:18 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Aguilar",
"A. C.",
""
],
[
"De Soto",
"F.",
""
],
[
"Ferreira",
"M. N.",
""
],
[
"Papavassiliou",
"J.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
],
[
"Zafeiropoulos",
"S.",
""
]
] | We present a detailed analysis of the kinetic and mass terms associated with the Landau gauge gluon propagator in the presence of dynamical quarks, and a comprehensive dynamical study of certain special kinematic limits of the three-gluon vertex. Our approach capitalizes on results from recent lattice simulations with (2+1) domain wall fermions, a novel nonlinear treatment of the gluon mass equation, and the nonperturbative reconstruction of the longitudinal three-gluon vertex from its fundamental Slavnov-Taylor identities. Particular emphasis is placed on the persistence of the suppression displayed by certain combinations of the vertex form factors at intermediate and low momenta, already known from numerous pure Yang-Mills studies. One of our central findings is that the inclusion of dynamical quarks moderates the intensity of this phenomenon only mildly, leaving the asymptotic low-momentum behavior unaltered, but displaces the characteristic "zero crossing" deeper into the infrared region. In addition, the effect of the three-gluon vertex is explored at the level of the renormalization-group invariant combination corresponding to the effective gauge coupling, whose size is considerably reduced with respect to its counterpart obtained from the ghost-gluon vertex. The main upshot of the above considerations is the further confirmation of the tightly interwoven dynamics between the two- and three-point sectors of QCD. |
0904.2418 | Shi-Lin Zhu | Shi-Lin Zhu | Large $N_c$ Expansion and the Parity Violating $\pi, N, \Delta$
Couplings | null | Phys. Rev. D 79, 116002 (2009) | 10.1103/PhysRevD.79.116002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the limit of large $N_c$ we first consider the $N_c$ ordering of the
various parity violating $\pi, N, \Delta$ couplings. Then we derive the
relations among these couplings and consistency relations from the stability of
these couplings under the chiral loop corrections with and without the mass
splitting between $N$ and $\Delta$. Especially we find that $h_\Delta =-{3\over
\sqrt{5}}h_\pi$ in the large $N_c$ limit, which correctly reproduces the
relative sign and magnitude of the "DDH" values for these PV couplings.
| [
{
"created": "Thu, 16 Apr 2009 01:32:50 GMT",
"version": "v1"
}
] | 2009-06-17 | [
[
"Zhu",
"Shi-Lin",
""
]
] | In the limit of large $N_c$ we first consider the $N_c$ ordering of the various parity violating $\pi, N, \Delta$ couplings. Then we derive the relations among these couplings and consistency relations from the stability of these couplings under the chiral loop corrections with and without the mass splitting between $N$ and $\Delta$. Especially we find that $h_\Delta =-{3\over \sqrt{5}}h_\pi$ in the large $N_c$ limit, which correctly reproduces the relative sign and magnitude of the "DDH" values for these PV couplings. |
hep-ph/0308167 | Pran Nath | Tarek Ibrahim and Pran Nath | Corrections to b, t quark masses and $\tau$ lepton mass in SUGRA
including CP phases | Based on talk at SUGRA20 at Northeastern University, Boston, USA,
March 17-21. 14 pages including 5 figures, Latex | null | null | null | hep-ph | null | A brief review is given of recent analyses of the effects of CP phases on the
supersymmetric QCD and supersymmetric electroweak contibutions to the $b$ and
$t$ quark masses and to the $\tau$ lepton mass in SUGRA models. The effects of
CP phases on the supersymmetric contributions are found to be significanlty
large for the b quark mass as they can change both its sign and its magnitude.
Thus with the inclusion of CP phases the supersymmetric correction to the b
quark mass can be as much as fifty percent or more of the total b quark mass.
For the case of the $\tau$ lepton, the effects of CP phases on the
supersymmetric correction is also relatively large as it can again affect both
the sign and the magnitude of the $\tau$ mass correction. However, in this case
the overall correction is found to be only a few percent. The effect of CP
phases on SUSY contribution to the $t$ quark mass was also investigated.
However, in this case the overall correction is less than a percent with or
without the inclusion of phases. These results have important implications for
$b-\tau$ unification and for $b-t-\tau$ unification in the context of unified
theories.
| [
{
"created": "Fri, 15 Aug 2003 23:14:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ibrahim",
"Tarek",
""
],
[
"Nath",
"Pran",
""
]
] | A brief review is given of recent analyses of the effects of CP phases on the supersymmetric QCD and supersymmetric electroweak contibutions to the $b$ and $t$ quark masses and to the $\tau$ lepton mass in SUGRA models. The effects of CP phases on the supersymmetric contributions are found to be significanlty large for the b quark mass as they can change both its sign and its magnitude. Thus with the inclusion of CP phases the supersymmetric correction to the b quark mass can be as much as fifty percent or more of the total b quark mass. For the case of the $\tau$ lepton, the effects of CP phases on the supersymmetric correction is also relatively large as it can again affect both the sign and the magnitude of the $\tau$ mass correction. However, in this case the overall correction is found to be only a few percent. The effect of CP phases on SUSY contribution to the $t$ quark mass was also investigated. However, in this case the overall correction is less than a percent with or without the inclusion of phases. These results have important implications for $b-\tau$ unification and for $b-t-\tau$ unification in the context of unified theories. |
hep-ph/0503273 | Luis Roca | L. Roca, E. Oset and J. Singh | Low lying axial-vector mesons as dynamically generated resonances | 31 pages, 12 figures, Accepted for publication in Phys.Rev.D | Phys.Rev.D72:014002,2005 | 10.1103/PhysRevD.72.014002 | FTUV-05-0629, IFIC-05-0629 | hep-ph | null | We make a theoretical study of the s-wave interaction of the nonet of vector
mesons with the octet of pseudoscalar mesons starting from a chiral invariant
Lagrangian and implementing unitarity in coupled channels. By looking for poles
in the unphysical Riemann sheets of the unitarized scattering amplitudes, we
get two octets and one singlet of axial-vector dynamically generated
resonances. The poles found can be associated to most of the low lying
axial-vector resonances quoted in the Particle Data Book: $b_1(1235)$,
$h_1(1170)$, $h_1(1380)$, $a_1(1260)$, $f_1(1285)$ and two poles to the
$K_1(1270)$ resonance. We evaluate the couplings of the resonances to the $VP$
states and the partial decay widths in order to reinforce the arguments in the
discussion.
| [
{
"created": "Tue, 29 Mar 2005 08:37:14 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2005 14:46:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Roca",
"L.",
""
],
[
"Oset",
"E.",
""
],
[
"Singh",
"J.",
""
]
] | We make a theoretical study of the s-wave interaction of the nonet of vector mesons with the octet of pseudoscalar mesons starting from a chiral invariant Lagrangian and implementing unitarity in coupled channels. By looking for poles in the unphysical Riemann sheets of the unitarized scattering amplitudes, we get two octets and one singlet of axial-vector dynamically generated resonances. The poles found can be associated to most of the low lying axial-vector resonances quoted in the Particle Data Book: $b_1(1235)$, $h_1(1170)$, $h_1(1380)$, $a_1(1260)$, $f_1(1285)$ and two poles to the $K_1(1270)$ resonance. We evaluate the couplings of the resonances to the $VP$ states and the partial decay widths in order to reinforce the arguments in the discussion. |
hep-ph/0303001 | Jay G. Wacker | Spencer Chang and Jay G. Wacker | Little Higgs and Custodial SU(2) | 23 pages, some typos fixed, reference added, and some improved
discussion. Version to appear in Phys Rev D | Phys.Rev.D69:035002,2004 | 10.1103/PhysRevD.69.035002 | HUTP-03/A019 | hep-ph | null | In this note we present a little Higgs model that has custodial SU(2) as an
approximate symmetry. This theory is a simple modification of the ``Minimal
Moose'' with SO(5) global symmetries protecting the Higgs mass. This allows for
a simple limit where TeV physics makes small contributions to precision
electroweak observables. The spectrum of particles and their couplings to
Standard Model fields are studied in detail. At low energies this model has two
Higgs doublets and it favours a light Higgs from precision electroweak bounds,
though for different reasons than in the Standard Model. The limit on the
breaking scale, f, is roughly 700 GeV, with a top partner of 2 TeV, W' and B'
of 2.5 TeV, and heavy Higgs partners of 2 TeV. These particles are easily
accessible at hadron colliders.
| [
{
"created": "Mon, 3 Mar 2003 20:06:16 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2003 21:16:03 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Jul 2003 14:45:12 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Jan 2004 21:10:15 GMT",
"version": "v4"
}
] | 2011-01-13 | [
[
"Chang",
"Spencer",
""
],
[
"Wacker",
"Jay G.",
""
]
] | In this note we present a little Higgs model that has custodial SU(2) as an approximate symmetry. This theory is a simple modification of the ``Minimal Moose'' with SO(5) global symmetries protecting the Higgs mass. This allows for a simple limit where TeV physics makes small contributions to precision electroweak observables. The spectrum of particles and their couplings to Standard Model fields are studied in detail. At low energies this model has two Higgs doublets and it favours a light Higgs from precision electroweak bounds, though for different reasons than in the Standard Model. The limit on the breaking scale, f, is roughly 700 GeV, with a top partner of 2 TeV, W' and B' of 2.5 TeV, and heavy Higgs partners of 2 TeV. These particles are easily accessible at hadron colliders. |
1111.5962 | Sang Hui Im | Kyu Jung Bae, Eung Jin Chun, and Sang Hui Im | Cosmology of the DFSZ axino | 24 pages, 12 figures. v2: discussion for 1PI interaction added in
section 2 | JCAP 1203:013,2012 | 10.1088/1475-7516/2012/03/013 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmological impact of the supersymmetric DFSZ axion model.
Extending recent works, we first provide a comprehensive analysis of thermal
production of the DFSZ axino considering all the possible scattering, decay and
inverse decay processes depending on various mass parameters and the reheat
temperature. Although it is hard for the DFSZ axino to be in thermal
equilibrium, its coupling is still large enough to generate huge axino
population which can turn into overabundant neutralino density. We examine the
neutralino parameter space to identify the dark matter property depending on
the Peccei-Quinn scale. As the Peccei-Quinn scale becomes higher resulting in
longer axino lifetime, the neutralino dark matter appears in a lighter
Higgsino-like LSP region or a more restricted Bino-like LSP region allowing a
resonant annihilation through a CP-odd Higgs boson to meet stronger
reannihilation.
| [
{
"created": "Fri, 25 Nov 2011 12:21:17 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2012 16:07:22 GMT",
"version": "v2"
}
] | 2012-03-12 | [
[
"Bae",
"Kyu Jung",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"Im",
"Sang Hui",
""
]
] | We study the cosmological impact of the supersymmetric DFSZ axion model. Extending recent works, we first provide a comprehensive analysis of thermal production of the DFSZ axino considering all the possible scattering, decay and inverse decay processes depending on various mass parameters and the reheat temperature. Although it is hard for the DFSZ axino to be in thermal equilibrium, its coupling is still large enough to generate huge axino population which can turn into overabundant neutralino density. We examine the neutralino parameter space to identify the dark matter property depending on the Peccei-Quinn scale. As the Peccei-Quinn scale becomes higher resulting in longer axino lifetime, the neutralino dark matter appears in a lighter Higgsino-like LSP region or a more restricted Bino-like LSP region allowing a resonant annihilation through a CP-odd Higgs boson to meet stronger reannihilation. |
1805.11419 | Carlos Merino | G.H. Arakelyan, C. Merino, Yu.M. Shabelski | Hadroproduction of neutral Kstar-mesons up to LHC energies | 19 pages, 8 figures, and 4 tables. arXiv admin note: text overlap
with arXiv:1610.06039 | null | 10.1140/epja/i2019-12832-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the experimental data on neutral Kstar-meson production on
nucleon and nuclear targets. The Quark-Gluon String Model quantitatively
describes the inclusive density in the midrapidity region, as well as the
initial energy and A dependences of the produced Kstar-mesons.
| [
{
"created": "Mon, 28 May 2018 09:34:58 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Arakelyan",
"G. H.",
""
],
[
"Merino",
"C.",
""
],
[
"Shabelski",
"Yu. M.",
""
]
] | We consider the experimental data on neutral Kstar-meson production on nucleon and nuclear targets. The Quark-Gluon String Model quantitatively describes the inclusive density in the midrapidity region, as well as the initial energy and A dependences of the produced Kstar-mesons. |
hep-ph/9807309 | Michal Brhlik | Michal Brhlik | $b\to s\gamma$ Decay in Supersymmetric Theories | 4 pp., Talk given at the 6th International Symposium on Particles,
Strings, and Cosmology (PASCOS 98), Boston, MA, March 1998 | null | null | null | hep-ph | null | Recent advances in the calculation of the $b\to s\gamma$ decay branching
ratio are presented in the context of supersymmetric theories. Theoretical
accuracy increased by inclusion of the next-to-leading order QCD corrections
makes it possible to significantly decrease scale dependence of the result.
Comparison with the latest CLEO experimental results then allows to limit
supersymmetric loop contributions to the process and consequently constrain the
parameter space of supersymmetric extensions of the Standard Model. We discuss
these constraints both in the minimal supergravity inspired model (SUGRA) and
in the simplest gauge-mediated supersymmetry breaking model (GMSB) both of
which are interesting from the point of view of the searches for supersymmetry
at present and future colliders. Our analysis also includes the interesting
region of large $\tan \beta$ relevant for models with Yukawa coupling
unification.
| [
{
"created": "Thu, 9 Jul 1998 15:40:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brhlik",
"Michal",
""
]
] | Recent advances in the calculation of the $b\to s\gamma$ decay branching ratio are presented in the context of supersymmetric theories. Theoretical accuracy increased by inclusion of the next-to-leading order QCD corrections makes it possible to significantly decrease scale dependence of the result. Comparison with the latest CLEO experimental results then allows to limit supersymmetric loop contributions to the process and consequently constrain the parameter space of supersymmetric extensions of the Standard Model. We discuss these constraints both in the minimal supergravity inspired model (SUGRA) and in the simplest gauge-mediated supersymmetry breaking model (GMSB) both of which are interesting from the point of view of the searches for supersymmetry at present and future colliders. Our analysis also includes the interesting region of large $\tan \beta$ relevant for models with Yukawa coupling unification. |
1709.07196 | Takayuki Matsuki | Kan Chen, Yubing Dong, Xiang Liu, Qi-Fang L\"u, and Takayuki Matsuki | Regge-like relation and a universal description of heavy-light systems | 10 pages, 8 figures, 5 tables | Eur. Phys. J. C (2018) 78:20 | 10.1140/epjc/s10052-017-5512-3 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Regge-like formula $(M-m_Q)^2=\pi\sigma L$ between hadron mass $M$
and angular momentum $L$ with a heavy quark mass $m_Q$ and a string tension
$\sigma$, we analyze all the heavy-light systems, i.e., $D/D_s/B/B_s$ mesons
and charmed and bottom baryons.Numerical plots are obtained for all the
heavy-light mesons of experimental data whose slope becomes nearly equal to 1/2
of that for light hadrons. Assuming that charmed and bottom baryons consist of
one heavy quark and one light cluster of two light quarks (diquark), we apply
the formula to all the heavy-light baryons including recently discovered
$\Omega_c$'s and find that these baryons experimentally measured satisfy the
above formula. We predict the average mass values of $B$, $B_s$, $\Lambda_b$,
$\Sigma_c$, $\Xi_c$, and $\Omega_c$ with $L=2$ as 6.01, 6.13, 6.15, 3.05, 3.07,
and 3.34 GeV, respectively. Our results on baryons suggest that these baryons
can be safely regarded as heavy quark-light cluster configuration. We also find
a universal description for all the heavy-light mesons as well as baryons,
i.e., one unique line is enough to describe both of charmed and bottom
heavy-light systems. Our results suggest that instead of mass itself, gluon
flux energy is essential to obtain a linear trajectory.
| [
{
"created": "Thu, 21 Sep 2017 08:08:44 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2017 09:32:03 GMT",
"version": "v2"
}
] | 2018-01-19 | [
[
"Chen",
"Kan",
""
],
[
"Dong",
"Yubing",
""
],
[
"Liu",
"Xiang",
""
],
[
"Lü",
"Qi-Fang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] | Using the Regge-like formula $(M-m_Q)^2=\pi\sigma L$ between hadron mass $M$ and angular momentum $L$ with a heavy quark mass $m_Q$ and a string tension $\sigma$, we analyze all the heavy-light systems, i.e., $D/D_s/B/B_s$ mesons and charmed and bottom baryons.Numerical plots are obtained for all the heavy-light mesons of experimental data whose slope becomes nearly equal to 1/2 of that for light hadrons. Assuming that charmed and bottom baryons consist of one heavy quark and one light cluster of two light quarks (diquark), we apply the formula to all the heavy-light baryons including recently discovered $\Omega_c$'s and find that these baryons experimentally measured satisfy the above formula. We predict the average mass values of $B$, $B_s$, $\Lambda_b$, $\Sigma_c$, $\Xi_c$, and $\Omega_c$ with $L=2$ as 6.01, 6.13, 6.15, 3.05, 3.07, and 3.34 GeV, respectively. Our results on baryons suggest that these baryons can be safely regarded as heavy quark-light cluster configuration. We also find a universal description for all the heavy-light mesons as well as baryons, i.e., one unique line is enough to describe both of charmed and bottom heavy-light systems. Our results suggest that instead of mass itself, gluon flux energy is essential to obtain a linear trajectory. |
hep-ph/0512219 | Ezio Maina | E. Accomando, A. Ballestrero, S. Bolognesi, E. Maina, C. Mariotti | Boson-boson scattering and Higgs production at the LHC from a six
fermion point of view: four jets + l$\nu$ processes at $\O(\alpha_{em}^6)$ | 26 pages, 19 figures | JHEP0603:093,2006 | 10.1088/1126-6708/2006/03/093 | null | hep-ph | null | Boson-boson scattering and Higgs production in boson-boson fusion hold the
key to electroweak symmetry breaking. In order to analyze these essential
features of the Standard Model we have performed a partonic level study of all
processes $q_1 q_2 \to q_3 q_4 q_5 q_6 l \nu$ at the LHC using the exact matrix
elements at $\O(\alpha_{em}^6)$ provided by \Phase, a new MC generator. These
processes include also three boson production and the purely electroweak
contribution to \toptop production as well as all irreducible backgrounds.
Kinematical cuts have been studied in order to enhance the VV scattering signal
over background. \Phase has been compared with different Monte Carlo's showing
that a complete calculation is necessary for a correct description of the
process.
| [
{
"created": "Fri, 16 Dec 2005 20:55:00 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Dec 2005 15:10:09 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Accomando",
"E.",
""
],
[
"Ballestrero",
"A.",
""
],
[
"Bolognesi",
"S.",
""
],
[
"Maina",
"E.",
""
],
[
"Mariotti",
"C.",
""
]
] | Boson-boson scattering and Higgs production in boson-boson fusion hold the key to electroweak symmetry breaking. In order to analyze these essential features of the Standard Model we have performed a partonic level study of all processes $q_1 q_2 \to q_3 q_4 q_5 q_6 l \nu$ at the LHC using the exact matrix elements at $\O(\alpha_{em}^6)$ provided by \Phase, a new MC generator. These processes include also three boson production and the purely electroweak contribution to \toptop production as well as all irreducible backgrounds. Kinematical cuts have been studied in order to enhance the VV scattering signal over background. \Phase has been compared with different Monte Carlo's showing that a complete calculation is necessary for a correct description of the process. |
1605.08056 | Jos\'e Francisco Zurita | Malte Buschmann, Sonia El Hedri, Anna Kaminska, Jia Liu, Maikel de
Vries, Xiao-Ping Wang, Felix Yu, Jose Zurita | Hunting for Dark Matter Coannihilation by Mixing Dijet Resonances and
Missing Transverse Energy | 35 pages, 9 figures | null | 10.1007/JHEP09(2016)033 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Simplified models of the dark matter (co)annihilation mechanism predict
striking new collider signatures untested by current searches. These models,
which were codified in the coannihilation codex, provide the basis for a dark
matter (DM) discovery program at the Large Hadron Collider (LHC) driven by the
measured DM relic density. In this work, we study an exemplary model featuring
$s$-channel DM coannihilation through a scalar diquark mediator as a
representative case study of scenarios with strongly interacting coannihilation
partners. We discuss the full phenomenology of the model, ranging from low
energy flavor constraints, vacuum stability requirements, and precision Higgs
effects to direct detection and indirect detection prospects. Moreover,
motivated by the relic density calculation, we find significant portions of
parameter space are compatible with current collider constraints and can be
probed by future searches, including a proposed analysis for the novel
signature of a dijet resonance accompanied by missing transverse energy (MET).
Our results show that the $13$ TeV LHC with $100~\mathrm{fb}^{-1}$ luminosity
should be sensitive to mediators as heavy as 1 TeV and dark matter in the
400--500 GeV range. The combination of searches for single and paired dijet
peaks, non-resonant jets + MET excesses, and our novel resonant dijet + MET
signature have strong coverage of the motivated relic density region,
reflecting the tight connections between particles determining the dark matter
abundance and their experimental signatures at the LHC.
| [
{
"created": "Wed, 25 May 2016 20:00:38 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Buschmann",
"Malte",
""
],
[
"Hedri",
"Sonia El",
""
],
[
"Kaminska",
"Anna",
""
],
[
"Liu",
"Jia",
""
],
[
"de Vries",
"Maikel",
""
],
[
"Wang",
"Xiao-Ping",
""
],
[
"Yu",
"Felix",
""
],
[
"Zurita... | Simplified models of the dark matter (co)annihilation mechanism predict striking new collider signatures untested by current searches. These models, which were codified in the coannihilation codex, provide the basis for a dark matter (DM) discovery program at the Large Hadron Collider (LHC) driven by the measured DM relic density. In this work, we study an exemplary model featuring $s$-channel DM coannihilation through a scalar diquark mediator as a representative case study of scenarios with strongly interacting coannihilation partners. We discuss the full phenomenology of the model, ranging from low energy flavor constraints, vacuum stability requirements, and precision Higgs effects to direct detection and indirect detection prospects. Moreover, motivated by the relic density calculation, we find significant portions of parameter space are compatible with current collider constraints and can be probed by future searches, including a proposed analysis for the novel signature of a dijet resonance accompanied by missing transverse energy (MET). Our results show that the $13$ TeV LHC with $100~\mathrm{fb}^{-1}$ luminosity should be sensitive to mediators as heavy as 1 TeV and dark matter in the 400--500 GeV range. The combination of searches for single and paired dijet peaks, non-resonant jets + MET excesses, and our novel resonant dijet + MET signature have strong coverage of the motivated relic density region, reflecting the tight connections between particles determining the dark matter abundance and their experimental signatures at the LHC. |
2401.00560 | Daniele Perri | Daniele Perri, Kyrilo Bondarenko, Michele Doro, Takeshi Kobayashi | Monopole acceleration in intergalactic magnetic fields | 19 pages, 5 figures | null | null | null | hep-ph astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a comprehensive analysis of the acceleration of magnetic monopoles
in intergalactic magnetic fields. We demonstrate that monopoles with
intermediate to low masses can be accelerated to relativistic velocities. This
can significantly affect direct and indirect searches for magnetic monopoles.
As an example, we show that the Parker bound is relaxed in the presence of
intergalactic fields. We also find that a cosmic population of monopoles can
produce significant backreaction on the intergalactic fields.
| [
{
"created": "Sun, 31 Dec 2023 18:22:10 GMT",
"version": "v1"
}
] | 2024-01-05 | [
[
"Perri",
"Daniele",
""
],
[
"Bondarenko",
"Kyrilo",
""
],
[
"Doro",
"Michele",
""
],
[
"Kobayashi",
"Takeshi",
""
]
] | We provide a comprehensive analysis of the acceleration of magnetic monopoles in intergalactic magnetic fields. We demonstrate that monopoles with intermediate to low masses can be accelerated to relativistic velocities. This can significantly affect direct and indirect searches for magnetic monopoles. As an example, we show that the Parker bound is relaxed in the presence of intergalactic fields. We also find that a cosmic population of monopoles can produce significant backreaction on the intergalactic fields. |
1907.01059 | Noah Steinberg | Minjie Lei, Noah Steinberg, James D. Wells | Probing Non-Standard Neutrino Interactions with Supernova Neutrinos at
Hyper-K | 18 pages, 9 figures - Added figures and prepared for submission to
JHEP | null | 10.1007/JHEP01(2020)179 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Non-standard neutrino self interactions (NSSI) could be stronger than Fermi
interactions. We investigate the ability to constrain these four-neutrino
interactions by their effect on the flux of neutrinos originating from a
galactic supernova. In the dense medium of a core collapse supernova, these new
self interactions can have a significant impact on neutrino oscillations,
leading to changes at the flavor evolution and spectra level. We use
simulations of the neutrino flux from a 13 solar mass, core collapse supernova
at 10 kpc away, and numerically propagate these neutrinos through the stellar
medium taking into account vacuum/MSW oscillations, SM $\nu-\nu$ scattering as
well as $\nu-\nu$ interactions that arise from NSSI. We pass the resulting
neutrino flux to a simulation of the future Hyper-Kamiokande detector to see
what constraints on NSSI parameters are possible when the next galactic
supernova becomes visible. We find that these constraints depend strongly on
the neutrino mass hierarchy and if the NSSI is flavor-violating or preserving.
Sensitivity to NSSI in the normal hierarchy (NH) at Hyper-K is limited by the
experiment's ability to efficiently detect $\nu_{e}$, but deviations from no
NSSI could be seen if the NSSI is particularly strong. In the inverted
hierarchy (IH) scenario, Hyper-K can significantly improve constraints on
flavor-violating NSSI down to $\mathcal{O}(10^{-1})G_{F}$.
| [
{
"created": "Mon, 1 Jul 2019 20:25:45 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2019 00:41:19 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jan 2020 17:01:26 GMT",
"version": "v3"
}
] | 2020-02-19 | [
[
"Lei",
"Minjie",
""
],
[
"Steinberg",
"Noah",
""
],
[
"Wells",
"James D.",
""
]
] | Non-standard neutrino self interactions (NSSI) could be stronger than Fermi interactions. We investigate the ability to constrain these four-neutrino interactions by their effect on the flux of neutrinos originating from a galactic supernova. In the dense medium of a core collapse supernova, these new self interactions can have a significant impact on neutrino oscillations, leading to changes at the flavor evolution and spectra level. We use simulations of the neutrino flux from a 13 solar mass, core collapse supernova at 10 kpc away, and numerically propagate these neutrinos through the stellar medium taking into account vacuum/MSW oscillations, SM $\nu-\nu$ scattering as well as $\nu-\nu$ interactions that arise from NSSI. We pass the resulting neutrino flux to a simulation of the future Hyper-Kamiokande detector to see what constraints on NSSI parameters are possible when the next galactic supernova becomes visible. We find that these constraints depend strongly on the neutrino mass hierarchy and if the NSSI is flavor-violating or preserving. Sensitivity to NSSI in the normal hierarchy (NH) at Hyper-K is limited by the experiment's ability to efficiently detect $\nu_{e}$, but deviations from no NSSI could be seen if the NSSI is particularly strong. In the inverted hierarchy (IH) scenario, Hyper-K can significantly improve constraints on flavor-violating NSSI down to $\mathcal{O}(10^{-1})G_{F}$. |
2307.05693 | Luca Rottoli | Jeppe R. Andersen, Pier Francesco Monni, Luca Rottoli, Gavin P. Salam,
Alba Soto-Ontoso | Exploring high-purity multi-parton scattering at hadron colliders | 5 pages + supplementary material. Matches version published in PRL | null | 10.1103/PhysRevLett.132.041901 | CERN-TH-2023-055, DCPT/23/54, IPPP/23/27, OUTP-23-04P, ZU-TH 17/23 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Multi-parton interactions are a fascinating phenomenon that occur in almost
every high-energy hadron--hadron collision, yet are remarkably difficult to
study quantitatively. In this letter we present a strategy to optimally
disentangle multi-parton interactions from the primary scattering in a
collision. That strategy enables probes of multi-parton interactions that are
significantly beyond the state of the art, including their characteristic
momentum scale, the interconnection between primary and secondary scatters, and
the pattern of three and potentially even more simultaneous hard scatterings.
This opens a path to powerful new constraints on multi-parton interactions for
LHC phenomenology and to the investigation of their rich field-theoretical
structure.
| [
{
"created": "Tue, 11 Jul 2023 18:01:31 GMT",
"version": "v1"
},
{
"created": "Fri, 17 May 2024 12:32:34 GMT",
"version": "v2"
}
] | 2024-05-20 | [
[
"Andersen",
"Jeppe R.",
""
],
[
"Monni",
"Pier Francesco",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Salam",
"Gavin P.",
""
],
[
"Soto-Ontoso",
"Alba",
""
]
] | Multi-parton interactions are a fascinating phenomenon that occur in almost every high-energy hadron--hadron collision, yet are remarkably difficult to study quantitatively. In this letter we present a strategy to optimally disentangle multi-parton interactions from the primary scattering in a collision. That strategy enables probes of multi-parton interactions that are significantly beyond the state of the art, including their characteristic momentum scale, the interconnection between primary and secondary scatters, and the pattern of three and potentially even more simultaneous hard scatterings. This opens a path to powerful new constraints on multi-parton interactions for LHC phenomenology and to the investigation of their rich field-theoretical structure. |
hep-ph/0403098 | Andrea Dainese | A. Dainese, R. Vogt, M. Bondila, K.J. Eskola and V.J. Kolhinen | D meson enhancement in pp collisions at the LHC due to nonlinear gluon
evolution | 15 pages, 4 figures, final version accepted by J. Phys. G | J.Phys.G30:1787-1799,2004 | 10.1088/0954-3899/30/12/002 | HIP-2004-06/TH, LBNL-54671 | hep-ph nucl-th | null | When nonlinear effects on the gluon evolution are included with constraints
from HERA, the gluon distribution in the free proton is enhanced at low
momentum fractions, x < 0.01, and low scales, Q^2 < 10 GeV^2, relative to
standard, DGLAP-evolved, gluon distributions. Consequently, such gluon
distributions can enhance charm production in pp collisions at center of mass
energy 14 TeV by up to a factor of five at midrapidity, y \sim 0, and
transverse momentum p_T -> 0 in the most optimistic case. We show that most of
this enhancement survives hadronization into D mesons. Assuming the same
enhancement at leading and next-to-leading order, we show that the D
enhancement may be measured by D^0 reconstruction in the K^-\pi^+ decay channel
with the ALICE detector.
| [
{
"created": "Tue, 9 Mar 2004 13:10:27 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2004 17:29:31 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Dainese",
"A.",
""
],
[
"Vogt",
"R.",
""
],
[
"Bondila",
"M.",
""
],
[
"Eskola",
"K. J.",
""
],
[
"Kolhinen",
"V. J.",
""
]
] | When nonlinear effects on the gluon evolution are included with constraints from HERA, the gluon distribution in the free proton is enhanced at low momentum fractions, x < 0.01, and low scales, Q^2 < 10 GeV^2, relative to standard, DGLAP-evolved, gluon distributions. Consequently, such gluon distributions can enhance charm production in pp collisions at center of mass energy 14 TeV by up to a factor of five at midrapidity, y \sim 0, and transverse momentum p_T -> 0 in the most optimistic case. We show that most of this enhancement survives hadronization into D mesons. Assuming the same enhancement at leading and next-to-leading order, we show that the D enhancement may be measured by D^0 reconstruction in the K^-\pi^+ decay channel with the ALICE detector. |
2407.04422 | Jun Gao | Jun Gao, ChongYang Liu, XiaoMin Shen, Hongxi Xing, Yuxiang Zhao | Global analysis of fragmentation functions to charged hadrons with
high-precision data from the LHC | 44 pages, 45 figures | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | Fragmentation functions (FFs) are essential non-perturbative QCD inputs for
predicting hadron production cross sections in high energy scatterings. In this
study, we present a joint determination of FFs for light charged hadrons
through a global analysis at next-to-leading order (NLO) in QCD. Our analysis
incorporates a wide range of precision measurements from the LHC, as well as
data from electron-positron collisions and semi-inclusive deep inelastic
scatterings. By including measurements of jet fragmentation at the LHC in our
global analysis, we are able to impose strong constraints on the gluon FFs. A
careful selection of hadron kinematics is applied to ensure the validity of
factorization and perturbative calculations of QCD. In addition, we introduce
several methodological advances in fitting, resulting in a flexible
parametrization form and the inclusion of theoretical uncertainties from
perturbative calculations. Our best-fit predictions show very good agreement
with the global data, with $\chi^2/N_{pt}\sim 0.90$. We also generate a large
number of Hessian error sets to estimate uncertainties and correlations of the
extracted FFs. FFs to charged pions (kaons and protons) are well constrained
for momentum fractions down to 0.01 (0.1). Total momentum of partons carried by
light charged hadrons are determined precisely. Their values for $u$, $d$
quarks and gluon saturate at about 50\% for a lower cut of the momentum
fraction of 0.01. Pulls from individual datasets and impact of various choices
of the analysis are also studied in details. Additionally, we present an update
of the FMNLO program used for calculating hadron production cross sections. Our
FFs, including the error sets (denoted as NPC23), are publicly available in the
form of LHAPDF6 grids.
| [
{
"created": "Mon, 1 Jul 2024 03:57:04 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Gao",
"Jun",
""
],
[
"Liu",
"ChongYang",
""
],
[
"Shen",
"XiaoMin",
""
],
[
"Xing",
"Hongxi",
""
],
[
"Zhao",
"Yuxiang",
""
]
] | Fragmentation functions (FFs) are essential non-perturbative QCD inputs for predicting hadron production cross sections in high energy scatterings. In this study, we present a joint determination of FFs for light charged hadrons through a global analysis at next-to-leading order (NLO) in QCD. Our analysis incorporates a wide range of precision measurements from the LHC, as well as data from electron-positron collisions and semi-inclusive deep inelastic scatterings. By including measurements of jet fragmentation at the LHC in our global analysis, we are able to impose strong constraints on the gluon FFs. A careful selection of hadron kinematics is applied to ensure the validity of factorization and perturbative calculations of QCD. In addition, we introduce several methodological advances in fitting, resulting in a flexible parametrization form and the inclusion of theoretical uncertainties from perturbative calculations. Our best-fit predictions show very good agreement with the global data, with $\chi^2/N_{pt}\sim 0.90$. We also generate a large number of Hessian error sets to estimate uncertainties and correlations of the extracted FFs. FFs to charged pions (kaons and protons) are well constrained for momentum fractions down to 0.01 (0.1). Total momentum of partons carried by light charged hadrons are determined precisely. Their values for $u$, $d$ quarks and gluon saturate at about 50\% for a lower cut of the momentum fraction of 0.01. Pulls from individual datasets and impact of various choices of the analysis are also studied in details. Additionally, we present an update of the FMNLO program used for calculating hadron production cross sections. Our FFs, including the error sets (denoted as NPC23), are publicly available in the form of LHAPDF6 grids. |
0709.1497 | Chandra Nepali | C. Nepali, G. Fai, and D. Keane | Selection of special orientations in relativistic collisions of deformed
heavy nuclei | 5 pages, 6 figures | Phys.Rev.C76:051902,2007; Erratum-ibid.C76:069903,2007 | 10.1103/PhysRevC.76.051902 10.1103/PhysRevC.76.069903 | null | hep-ph | null | We have studied U+U collisions at $\sqrt{s_{NN}}$ = 200 GeV using Monte Carlo
Glauber, UrQMD and AMPT models. We find that it is possible to separate central
tip-tip events as well as central body-body events on the basis of cuts on
multiplicity and magnitude of the reduced flow vector.
| [
{
"created": "Mon, 10 Sep 2007 21:49:22 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Nepali",
"C.",
""
],
[
"Fai",
"G.",
""
],
[
"Keane",
"D.",
""
]
] | We have studied U+U collisions at $\sqrt{s_{NN}}$ = 200 GeV using Monte Carlo Glauber, UrQMD and AMPT models. We find that it is possible to separate central tip-tip events as well as central body-body events on the basis of cuts on multiplicity and magnitude of the reduced flow vector. |
0711.0008 | Andrzej Czarnecki | Mariusz Puchalski, Andrzej Czarnecki, and Savely G. Karshenboim | Positronium-ion decay | 6 pages | Phys.Rev.Lett.99:203401,2007 | 10.1103/PhysRevLett.99.203401 | Alberta Thy 09-07 | hep-ph physics.atom-ph | null | We present a precise theoretical prediction for the decay width of the bound
state of two electrons and a positron (a negative positronium ion), Gamma(Ps^-)
= 2.087 085(12)/ns. We include O(alpha^2) effects of hard virtual photons as
well as soft corrections to the wave function and the decay amplitude. An
outcome of a large-scale variational calculation, this is the first result for
second-order corrections to a decay of a three-particle bound state. It will be
tested experimentally in the new positronium-ion facility in Garching in
Germany.
| [
{
"created": "Wed, 31 Oct 2007 21:59:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Puchalski",
"Mariusz",
""
],
[
"Czarnecki",
"Andrzej",
""
],
[
"Karshenboim",
"Savely G.",
""
]
] | We present a precise theoretical prediction for the decay width of the bound state of two electrons and a positron (a negative positronium ion), Gamma(Ps^-) = 2.087 085(12)/ns. We include O(alpha^2) effects of hard virtual photons as well as soft corrections to the wave function and the decay amplitude. An outcome of a large-scale variational calculation, this is the first result for second-order corrections to a decay of a three-particle bound state. It will be tested experimentally in the new positronium-ion facility in Garching in Germany. |
hep-ph/0008075 | Kazuhiro Tobe | Kazuhiro Tobe (CERN) | Lepton-Flavour-Violation in SUSY Models with and without R-parity | 4 pages, talk given at 8th International Workshop on Deep Inelastic
Scattering and QCD (DIS 2000), Liverpool, England, 25-30 Apr 2000 | null | null | CERN-TH/2000-169 | hep-ph | null | We discuss Lepton-Flavour-Violating phenomena such as $\mu \to e \gamma$,
$\mu \to eee$, and $\mu \to e$ conversion in nuclei in SUSY models with and
without R-parity. We stress that experimental searches for all the LFV
processes are important to distinguish between the different models.
| [
{
"created": "Wed, 9 Aug 2000 12:09:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tobe",
"Kazuhiro",
"",
"CERN"
]
] | We discuss Lepton-Flavour-Violating phenomena such as $\mu \to e \gamma$, $\mu \to eee$, and $\mu \to e$ conversion in nuclei in SUSY models with and without R-parity. We stress that experimental searches for all the LFV processes are important to distinguish between the different models. |
1404.4234 | HERAFitter Developers | HERAFitter developers' team: P. Belov, D. Britzger, S. Camarda, A.M.
Cooper-Sarkar, C. Diaconu, J. Feltesse, A. Gizhko, A. Glazov, V. Kolesnikov,
K. Lohwasser, A. Luszczak, V. Myronenko, H. Pirumov, R. Placakyte, K.
Rabbertz, V. Radescu, A. Sapronov, A. Schoening, S. Shushkevich, W.
Slominski, P. Starovoitov, M. Sutton, J. Tomaszewska, O. Turkot, G. Watt, K.
Wichmann, and M. Lisovyi | Parton distribution functions at LO, NLO and NNLO with correlated
uncertainties between orders | 10 pages, 5 figures | null | null | DESY-2014-054 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sets of parton distribution functions (PDFs) of the proton are reported for
the leading (LO), next-to-leading (NLO) and next-to-next-to leading order
(NNLO) QCD calculations. The parton distribution functions are determined with
the HERAFitter program using the data from the HERA experiments and preserving
correlations between uncertainties for the LO, NLO and NNLO PDF sets. The sets
are used to study cross-section ratios and their uncertainties when calculated
at different orders in QCD. A reduction of the overall theoretical uncertainty
is observed if correlations between the PDF sets are taken into account for the
ratio of $WW$ di-boson to $Z$ boson production cross sections at the LHC.
| [
{
"created": "Wed, 16 Apr 2014 13:26:27 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2014 12:34:58 GMT",
"version": "v2"
}
] | 2014-04-18 | [
[
"team",
"HERAFitter developers'",
""
],
[
":",
"",
""
],
[
"Belov",
"P.",
""
],
[
"Britzger",
"D.",
""
],
[
"Camarda",
"S.",
""
],
[
"Cooper-Sarkar",
"A. M.",
""
],
[
"Diaconu",
"C.",
""
],
[
"Felte... | Sets of parton distribution functions (PDFs) of the proton are reported for the leading (LO), next-to-leading (NLO) and next-to-next-to leading order (NNLO) QCD calculations. The parton distribution functions are determined with the HERAFitter program using the data from the HERA experiments and preserving correlations between uncertainties for the LO, NLO and NNLO PDF sets. The sets are used to study cross-section ratios and their uncertainties when calculated at different orders in QCD. A reduction of the overall theoretical uncertainty is observed if correlations between the PDF sets are taken into account for the ratio of $WW$ di-boson to $Z$ boson production cross sections at the LHC. |
1812.11154 | Peizhi Du | Zackaria Chacko, Peizhi Du, Michael Geller | Detecting a Secondary Cosmic Neutrino Background from Majoron Decays in
Neutrino Capture Experiments | 11 pages, 2 figures | Phys. Rev. D 100, 015050 (2019) | 10.1103/PhysRevD.100.015050 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider theories in which the generation of neutrino masses is associated
with the breaking of an approximate global lepton number symmetry. In such a
scenario the spectrum of light states includes the Majoron, the pseudo-Nambu
Goldstone boson associated with the breaking of the global symmetry. For a
broad range of parameters, the Majoron decays to neutrinos at late times, after
the cosmic neutrinos have decoupled from the thermal bath, resulting in a
secondary contribution to the cosmic neutrino background. We determine the
current bounds on this scenario, and explore the possibility of directly
detecting this secondary cosmic neutrino background in experiments based on
neutrino capture on nuclei. For Majoron masses in the eV range or below, the
neutrino flux from these decays can be comparable to that from the primary
cosmic neutrino background, making it a promising target for direct detection
experiments. The neutrinos from Majoron decay are redshifted by the cosmic
expansion, and exhibit a characteristic energy spectrum that depends on both
the Majoron mass and its lifetime. For Majoron lifetimes of order the age of
the universe or larger, there is also a monochromatic contribution to the
neutrino flux from Majoron decays in the Milky Way that can be comparable to
the diffuse extragalactic flux. We find that for Majoron masses in the eV
range, direct detection experiments based on neutrino capture on tritium, such
as PTOLEMY, will be sensitive to this scenario with 100 gram-years of data. In
the event of a signal, the galactic and extragalactic components can be
distinguished on the basis of their distinct energy distributions, and also by
using directional information obtained by polarizing the target nuclei.
| [
{
"created": "Fri, 28 Dec 2018 18:41:25 GMT",
"version": "v1"
}
] | 2019-08-07 | [
[
"Chacko",
"Zackaria",
""
],
[
"Du",
"Peizhi",
""
],
[
"Geller",
"Michael",
""
]
] | We consider theories in which the generation of neutrino masses is associated with the breaking of an approximate global lepton number symmetry. In such a scenario the spectrum of light states includes the Majoron, the pseudo-Nambu Goldstone boson associated with the breaking of the global symmetry. For a broad range of parameters, the Majoron decays to neutrinos at late times, after the cosmic neutrinos have decoupled from the thermal bath, resulting in a secondary contribution to the cosmic neutrino background. We determine the current bounds on this scenario, and explore the possibility of directly detecting this secondary cosmic neutrino background in experiments based on neutrino capture on nuclei. For Majoron masses in the eV range or below, the neutrino flux from these decays can be comparable to that from the primary cosmic neutrino background, making it a promising target for direct detection experiments. The neutrinos from Majoron decay are redshifted by the cosmic expansion, and exhibit a characteristic energy spectrum that depends on both the Majoron mass and its lifetime. For Majoron lifetimes of order the age of the universe or larger, there is also a monochromatic contribution to the neutrino flux from Majoron decays in the Milky Way that can be comparable to the diffuse extragalactic flux. We find that for Majoron masses in the eV range, direct detection experiments based on neutrino capture on tritium, such as PTOLEMY, will be sensitive to this scenario with 100 gram-years of data. In the event of a signal, the galactic and extragalactic components can be distinguished on the basis of their distinct energy distributions, and also by using directional information obtained by polarizing the target nuclei. |
hep-ph/9601386 | null | Francesco Murgia (University and INFN, Cagliari) | $^1P_1$ charmonium state decay into $p \bar p$ in QCD models including
constituent quark mass corrections | 17 pages, REVTeX 3.0, 1 postscript figure included. Revised version,
to be published in Physical Review D. Brief discussion of the role of other
nonperturbative effects and three references added in the introduction;
Comparison with QCD multipole expansion model slightly reformulated; Some
sentences added in the conclusions; Results unchanged | Phys.Rev. D54 (1996) 3365-3373 | 10.1103/PhysRevD.54.3365 | INFNCA-TH9602 | hep-ph | null | Stimulated by the experimental observation, made by the E760 Collaboration at
Fermilab, of the $^1\!P_1$ state of charmonium resonantly formed in $p\,\bar p$
annihilation, we perform a calculation of the decay width for the $^1\!P_1\to
p\,\bar p$ process. To this end, we employ a phenomenological model which adds
constituent quark mass corrections to the usual massless QCD models for
exclusive processes. For massless models, in fact, the process under
consideration is forbidden by the so-called helicity selection rules, while it
is allowed in our extended model. We find $\Gamma(^1\!P_1\to p\,\bar p)$ to be
in the range $1-10$ eV. We also compare our results with previous, indirect
estimates, based on QCD multipole expansion models.
| [
{
"created": "Wed, 31 Jan 1996 12:43:17 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 1996 13:15:08 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Murgia",
"Francesco",
"",
"University and INFN, Cagliari"
]
] | Stimulated by the experimental observation, made by the E760 Collaboration at Fermilab, of the $^1\!P_1$ state of charmonium resonantly formed in $p\,\bar p$ annihilation, we perform a calculation of the decay width for the $^1\!P_1\to p\,\bar p$ process. To this end, we employ a phenomenological model which adds constituent quark mass corrections to the usual massless QCD models for exclusive processes. For massless models, in fact, the process under consideration is forbidden by the so-called helicity selection rules, while it is allowed in our extended model. We find $\Gamma(^1\!P_1\to p\,\bar p)$ to be in the range $1-10$ eV. We also compare our results with previous, indirect estimates, based on QCD multipole expansion models. |
hep-ph/9909527 | Christian Schwanenberger | O. Nachtmann, C. Schwanenberger | The CP-violating triple gluon interaction in Z -> 4 jets | 18 pages, 5 figures | Eur.Phys.J.C13:315-321,2000 | 10.1007/s100520000340 | null | hep-ph | null | We analyse CP-violating effects in Z -> 4 jet decays, assuming the presence
of a CP-violating effective triple gluon coupling. We discuss the influence of
this coupling on the decay width. Furthermore, we analyse different CP-odd
observables and propose strategies of a direct search for such a CP-violating
GGG coupling. The present data of LEP 1 should give significant information on
the coupling.
| [
{
"created": "Tue, 28 Sep 1999 10:44:52 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Nachtmann",
"O.",
""
],
[
"Schwanenberger",
"C.",
""
]
] | We analyse CP-violating effects in Z -> 4 jet decays, assuming the presence of a CP-violating effective triple gluon coupling. We discuss the influence of this coupling on the decay width. Furthermore, we analyse different CP-odd observables and propose strategies of a direct search for such a CP-violating GGG coupling. The present data of LEP 1 should give significant information on the coupling. |
1402.0226 | John R. Hiller | J.R. Hiller | Light-front holography and the light-front coupled-cluster method | 12 pages, 8 figures, RevTeX 4.1; based on a talk contributed to the
Lightcone 2013 workshop, Skiathos, Greece, May 20-24, 2013 | null | 10.1007/s00601-014-0878-3 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the light-front coupled-cluster (LFCC) method for the solution
of field-theoretic bound-state eigenvalue problems and indicate the connection
with light-front holographic QCD. This includes a sample application of the
LFCC method and leads to a relativistic quark model for mesons that adds
longitudinal dynamics to the usual transverse light-front holographic
Schrodinger equation.
| [
{
"created": "Sun, 2 Feb 2014 18:09:32 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Hiller",
"J. R.",
""
]
] | We summarize the light-front coupled-cluster (LFCC) method for the solution of field-theoretic bound-state eigenvalue problems and indicate the connection with light-front holographic QCD. This includes a sample application of the LFCC method and leads to a relativistic quark model for mesons that adds longitudinal dynamics to the usual transverse light-front holographic Schrodinger equation. |
2310.13354 | Lu Meng | Lu Meng, Yan-Ke Chen, Yao Ma and Shi-Lin Zhu | Tetraquark bound states in constituent quark models: benchmark test
calculations | 15 pages, 7 figures and 5 Tables. Version accepted by PRD | null | 10.1103/PhysRevD.108.114016 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the tetraquark bound states that are manifestly exotic using
three distinct few-body methods: Gaussian Expansion Method (GEM), Resonating
Group Method (RGM), and Diffusion Monte Carlo (DMC). We refer to manifestly
exotic states that do not involve a mixture with the conventional mesons
through the creation and annihilation of $n\bar{n}$, where $n=u, d$. Our
calculations are conducted with two types of quark models: the pure constituent
quark model featuring one-gluon-exchange interactions and confinement
interactions, and the chiral constituent quark model, supplemented by extra
one-boson-exchange interactions. This study represents a comprehensive
benchmark test of various few-body methods and quark models. Our findings
reveal the superiority of GEM over RGM and DMC methods based on present
implements for the tetraquark bound states. Additionally, we observe a tendency
for the chiral quark model to overestimate the binding energies. We
systematically explore the fully, triply, doubly, and singly heavy tetraquark
states with $J^P=0^+,1^+,2^+$, encompassing over 150 states in total. We
successfully identify several bound states, including
$[cc\bar{n}\bar{n}]_{J^{P}=1^{+}}^{I=0}$,
$[bb\bar{n}\bar{n}]_{J^{P}=1^{+}}^{I=0}$,
$[bc\bar{n}\bar{n}]_{J^{P}=0^{+},1^{+},2^{+}}^{I=0}$,
$[bs\bar{n}\bar{n}]_{J^{P}=0^{+},1^{+}}^{I=0}$,
$[cs\bar{n}\bar{n}]_{J^{P}=0^{+}}^{I=0}$, and
$[bb\bar{n}\bar{s}]_{J^{P}=1^{+}}$, all found to be bound states below the
dimeson thresholds.
| [
{
"created": "Fri, 20 Oct 2023 08:43:29 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Nov 2023 06:19:37 GMT",
"version": "v2"
}
] | 2023-12-15 | [
[
"Meng",
"Lu",
""
],
[
"Chen",
"Yan-Ke",
""
],
[
"Ma",
"Yao",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We investigate the tetraquark bound states that are manifestly exotic using three distinct few-body methods: Gaussian Expansion Method (GEM), Resonating Group Method (RGM), and Diffusion Monte Carlo (DMC). We refer to manifestly exotic states that do not involve a mixture with the conventional mesons through the creation and annihilation of $n\bar{n}$, where $n=u, d$. Our calculations are conducted with two types of quark models: the pure constituent quark model featuring one-gluon-exchange interactions and confinement interactions, and the chiral constituent quark model, supplemented by extra one-boson-exchange interactions. This study represents a comprehensive benchmark test of various few-body methods and quark models. Our findings reveal the superiority of GEM over RGM and DMC methods based on present implements for the tetraquark bound states. Additionally, we observe a tendency for the chiral quark model to overestimate the binding energies. We systematically explore the fully, triply, doubly, and singly heavy tetraquark states with $J^P=0^+,1^+,2^+$, encompassing over 150 states in total. We successfully identify several bound states, including $[cc\bar{n}\bar{n}]_{J^{P}=1^{+}}^{I=0}$, $[bb\bar{n}\bar{n}]_{J^{P}=1^{+}}^{I=0}$, $[bc\bar{n}\bar{n}]_{J^{P}=0^{+},1^{+},2^{+}}^{I=0}$, $[bs\bar{n}\bar{n}]_{J^{P}=0^{+},1^{+}}^{I=0}$, $[cs\bar{n}\bar{n}]_{J^{P}=0^{+}}^{I=0}$, and $[bb\bar{n}\bar{s}]_{J^{P}=1^{+}}$, all found to be bound states below the dimeson thresholds. |
hep-ph/0211466 | David Mattingly | D. Mattingly, T. Jacobson, S. Liberati | Threshold configurations in the presence of Lorentz violating dispersion
relations | 5 pages, 3 figures | Phys.Rev. D67 (2003) 124012 | 10.1103/PhysRevD.67.124012 | null | hep-ph gr-qc hep-th | null | A general characterization of lower and upper threshold configurations for
two particle reactions is determined under the assumptions that the single
particle dispersion relations E(p) are rotationally invariant and monotonic in
p, and that energy and momentum are conserved and additive for multiple
particles. It is found that at a threshold the final particle momenta are
always parallel and the initial momenta are always anti-parallel. The
occurrence of new phenomena not occurring in a Lorentz invariant setting, such
as upper thresholds and asymmetric pair production thresholds, is explained,
and an illustrative example is given.
| [
{
"created": "Fri, 29 Nov 2002 19:27:00 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Mattingly",
"D.",
""
],
[
"Jacobson",
"T.",
""
],
[
"Liberati",
"S.",
""
]
] | A general characterization of lower and upper threshold configurations for two particle reactions is determined under the assumptions that the single particle dispersion relations E(p) are rotationally invariant and monotonic in p, and that energy and momentum are conserved and additive for multiple particles. It is found that at a threshold the final particle momenta are always parallel and the initial momenta are always anti-parallel. The occurrence of new phenomena not occurring in a Lorentz invariant setting, such as upper thresholds and asymmetric pair production thresholds, is explained, and an illustrative example is given. |
1607.04448 | Jean-Paul Blaizot | Jean-Paul Blaizot | High Gluon Densities in Heavy Ions Collisions | Submitted to Reports on Progress in Physics | null | 10.1088/1361-6633/aa5435 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The early stages of heavy ion collisions are dominated by high density
systems of gluons that carry each a small fraction $x$ of the momenta of the
colliding nucleons. A distinguishing feature of such systems is the phenomenon
of "saturation" which tames the expected growth of the gluon density as the
energy of the collision increases. The onset of saturation occurs at a
particular transverse momentum scale, the "saturation momentum", that emerges
dynamically and that marks the onset of non-linear gluon interactions. At high
energy, and for large nuclei, the saturation momentum is large compared to the
typical hadronic scale, making high density gluons amenable to a description
with weak coupling techniques. This paper reviews some of the challenges faced
in the study of such dense systems of small $x$ gluons, and of the progress
made in addressing them. The focus is on conceptual issues, and the
presentation is both pedagogical, and critical. Examples where high gluon
density could play a visible role in heavy ion collisions are briefly discussed
at the end, for illustration purpose.
| [
{
"created": "Fri, 15 Jul 2016 10:44:49 GMT",
"version": "v1"
}
] | 2017-02-22 | [
[
"Blaizot",
"Jean-Paul",
""
]
] | The early stages of heavy ion collisions are dominated by high density systems of gluons that carry each a small fraction $x$ of the momenta of the colliding nucleons. A distinguishing feature of such systems is the phenomenon of "saturation" which tames the expected growth of the gluon density as the energy of the collision increases. The onset of saturation occurs at a particular transverse momentum scale, the "saturation momentum", that emerges dynamically and that marks the onset of non-linear gluon interactions. At high energy, and for large nuclei, the saturation momentum is large compared to the typical hadronic scale, making high density gluons amenable to a description with weak coupling techniques. This paper reviews some of the challenges faced in the study of such dense systems of small $x$ gluons, and of the progress made in addressing them. The focus is on conceptual issues, and the presentation is both pedagogical, and critical. Examples where high gluon density could play a visible role in heavy ion collisions are briefly discussed at the end, for illustration purpose. |
2205.03187 | Teppei Kitahara | Syuhei Iguro, Teppei Kitahara, Yuji Omura | Scrutinizing the 95-100 GeV di-tau excess in the top associated process | 20 pages, 3 figures, 1 table; v2: references added; v3: matches
version published in EPJC | Eur. Phys. J. C 82, 1053 (2022) | 10.1140/epjc/s10052-022-11028-y | P3H-22-047, TTP22-027, KEK-TH-2424 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Recently, the CMS collaboration has reported a di-tau excess with a local
significance of 2.6-3.1$\sigma$ where the invariant mass is
$m_{\tau\tau}=$95-100 GeV. This excess can be interpreted as a light scalar
boson that couples to the third generation fermions, particularly top and
$\tau$. Based on the simplest model that can account for the CMS di-tau excess,
we evaluate experimental sensitivities to the additional light resonance, using
the results reported by the ATLAS collaboration. We see that a search for the
top-quark associated production of the SM Higgs boson that decays into
$\tau\bar\tau$ sets a strong model-independent limit. We also find that the
CP-even scalar interpretation of the light resonance is excluded by the ATLAS
results, while the CP-odd interpretation is not.
| [
{
"created": "Fri, 6 May 2022 13:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2022 12:28:08 GMT",
"version": "v2"
},
{
"created": "Sun, 20 Nov 2022 11:20:47 GMT",
"version": "v3"
}
] | 2022-11-24 | [
[
"Iguro",
"Syuhei",
""
],
[
"Kitahara",
"Teppei",
""
],
[
"Omura",
"Yuji",
""
]
] | Recently, the CMS collaboration has reported a di-tau excess with a local significance of 2.6-3.1$\sigma$ where the invariant mass is $m_{\tau\tau}=$95-100 GeV. This excess can be interpreted as a light scalar boson that couples to the third generation fermions, particularly top and $\tau$. Based on the simplest model that can account for the CMS di-tau excess, we evaluate experimental sensitivities to the additional light resonance, using the results reported by the ATLAS collaboration. We see that a search for the top-quark associated production of the SM Higgs boson that decays into $\tau\bar\tau$ sets a strong model-independent limit. We also find that the CP-even scalar interpretation of the light resonance is excluded by the ATLAS results, while the CP-odd interpretation is not. |
hep-ph/0601202 | RongGang Ping | Hong Chen, Rong-Gang Ping | Rescattering effects of baryon and antibaryon in heavy quarkonium decays | 8 pages, 1 figures, Your comments are welcome | Phys.Lett.B644:54-58,2007 | 10.1016/j.physletb.2006.05.093 | null | hep-ph | null | Rescattering effects of baryon and antibaryon in heavy quarkonium decays are
investigated by studying their angular distributions. The rescattering
amplitudes are phenomenologically evaluated by modeling the intermediate range
interaction as a $\sigma$ or pion meson exchange between $\qqbar$ quarks. The
results show that the rescattering effects play an important role in
determination of the angular distribution in heavy quarkonium decays.
Especially, for $J/psi$ and $\psi'$ decays into $\Lambda \bar \Lambda$,
$\Sigma^0\bar \Sigma^0$ and $\Xi^-\bar \Xi^+$ the angular distribution
parameters could turn to be negative values in the limit of helicity
conservation. These results provide us a possible explanation for understanding
the negative sign of the angular distribution parameter measured for $J/psi
\to\Sigma^0\bar\Sigma^0$, namely, {\it it might come from the baryonic
SU(3)$_F$ symmetry breaking by incorporating rescattering effects
| [
{
"created": "Wed, 25 Jan 2006 11:15:05 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Apr 2006 13:22:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chen",
"Hong",
""
],
[
"Ping",
"Rong-Gang",
""
]
] | Rescattering effects of baryon and antibaryon in heavy quarkonium decays are investigated by studying their angular distributions. The rescattering amplitudes are phenomenologically evaluated by modeling the intermediate range interaction as a $\sigma$ or pion meson exchange between $\qqbar$ quarks. The results show that the rescattering effects play an important role in determination of the angular distribution in heavy quarkonium decays. Especially, for $J/psi$ and $\psi'$ decays into $\Lambda \bar \Lambda$, $\Sigma^0\bar \Sigma^0$ and $\Xi^-\bar \Xi^+$ the angular distribution parameters could turn to be negative values in the limit of helicity conservation. These results provide us a possible explanation for understanding the negative sign of the angular distribution parameter measured for $J/psi \to\Sigma^0\bar\Sigma^0$, namely, {\it it might come from the baryonic SU(3)$_F$ symmetry breaking by incorporating rescattering effects |
1502.06525 | Germano Nardini | Isabella Masina, Germano Nardini, Mariano Quiros | Electroweak vacuum stability and finite quadratic radiative corrections | 36 pages, 5 figures; v2: logarithm corrections included, figures
improved, references added | Phys. Rev. D 92, 035003 (2015) | 10.1103/PhysRevD.92.035003 | CP3-Origins-2015-5, DIAS-2015-5, DESY 15-027, UAB-FT-767 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the Standard Model (SM) is an effective theory, as currently believed, it
is valid up to some energy scale $\Lambda$ to which the Higgs vacuum
expectation value is sensitive throughout radiative quadratic terms. The latter
ones destabilize the electroweak vacuum and generate the SM hierarchy problem.
For a given perturbative Ultraviolet (UV) completion, the SM cutoff can be
computed in terms of fundamental parameters. If the UV mass spectrum involves
several scales the cutoff is not unique and each SM sector has its own UV
cutoff $\Lambda_i$. We have performed this calculation assuming the Minimal
Supersymmetric Standard Model (MSSM) is the SM UV completion. As a result, from
the SM point of view, the quadratic corrections to the Higgs mass are
equivalent to finite threshold contributions. For the measured values of the
top quark and Higgs masses, and depending on the values of the different
cutoffs $\Lambda_i$, these contributions can cancel even at renormalization
scales as low as multi-TeV, unlike the case of a single cutoff where the
cancellation only occurs at Planckian energies, a result originally obtained by
Veltman. From the MSSM point of view, the requirement of stability of the
electroweak minimum under radiative corrections is incorporated into the
matching conditions and provides an extra constraint on the Focus Point
solution to the little hierarchy problem in the MSSM. These matching conditions
can be employed for precise calculations of the Higgs sector in scenarios with
heavy supersymmetric fields.
| [
{
"created": "Mon, 23 Feb 2015 17:41:46 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 2015 15:43:30 GMT",
"version": "v2"
}
] | 2015-08-12 | [
[
"Masina",
"Isabella",
""
],
[
"Nardini",
"Germano",
""
],
[
"Quiros",
"Mariano",
""
]
] | If the Standard Model (SM) is an effective theory, as currently believed, it is valid up to some energy scale $\Lambda$ to which the Higgs vacuum expectation value is sensitive throughout radiative quadratic terms. The latter ones destabilize the electroweak vacuum and generate the SM hierarchy problem. For a given perturbative Ultraviolet (UV) completion, the SM cutoff can be computed in terms of fundamental parameters. If the UV mass spectrum involves several scales the cutoff is not unique and each SM sector has its own UV cutoff $\Lambda_i$. We have performed this calculation assuming the Minimal Supersymmetric Standard Model (MSSM) is the SM UV completion. As a result, from the SM point of view, the quadratic corrections to the Higgs mass are equivalent to finite threshold contributions. For the measured values of the top quark and Higgs masses, and depending on the values of the different cutoffs $\Lambda_i$, these contributions can cancel even at renormalization scales as low as multi-TeV, unlike the case of a single cutoff where the cancellation only occurs at Planckian energies, a result originally obtained by Veltman. From the MSSM point of view, the requirement of stability of the electroweak minimum under radiative corrections is incorporated into the matching conditions and provides an extra constraint on the Focus Point solution to the little hierarchy problem in the MSSM. These matching conditions can be employed for precise calculations of the Higgs sector in scenarios with heavy supersymmetric fields. |
2209.13441 | Alexander Bernal | J. A. Aguilar-Saavedra, A. Bernal, J. A. Casas and J. M. Moreno | Testing entanglement and Bell inequalities in $H \to ZZ$ | null | null | 10.1103/PhysRevD.107.016012 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss quantum entanglement and violation of Bell inequalities in the
$H\rightarrow ZZ$ decay, in particular when the two $Z-$bosons decay into light
leptons. Although such process implies an important suppression of the
statistics, this is traded by clean signals from a "quasi maximally-entangled"
system, which makes it very promising to check these crucial phenomena at high
energy. In this paper we devise a novel framework to extract from $H \to ZZ$
data all significant information related to this goal, in particular spin
correlation observables. In this context we derive sufficient and necessary
conditions for entanglement in terms of only two parameters. Likewise, we
obtain a sufficient and improved condition for the violation of Bell-type
inequalities. The numerical analysis shows that with a luminosity of $L = 300
\text{fb}^{-1}$ entanglement can be probed at $> 3\sigma$ level. For $L = 3
\text{ab}^{-1}$ (HL-LHC) entanglement can be probed beyond the $5\sigma$ level,
while the sensitivity to a violation of the Bell inequalities is at the
$4.5\sigma$ level
| [
{
"created": "Tue, 27 Sep 2022 14:59:29 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Bernal",
"A.",
""
],
[
"Casas",
"J. A.",
""
],
[
"Moreno",
"J. M.",
""
]
] | We discuss quantum entanglement and violation of Bell inequalities in the $H\rightarrow ZZ$ decay, in particular when the two $Z-$bosons decay into light leptons. Although such process implies an important suppression of the statistics, this is traded by clean signals from a "quasi maximally-entangled" system, which makes it very promising to check these crucial phenomena at high energy. In this paper we devise a novel framework to extract from $H \to ZZ$ data all significant information related to this goal, in particular spin correlation observables. In this context we derive sufficient and necessary conditions for entanglement in terms of only two parameters. Likewise, we obtain a sufficient and improved condition for the violation of Bell-type inequalities. The numerical analysis shows that with a luminosity of $L = 300 \text{fb}^{-1}$ entanglement can be probed at $> 3\sigma$ level. For $L = 3 \text{ab}^{-1}$ (HL-LHC) entanglement can be probed beyond the $5\sigma$ level, while the sensitivity to a violation of the Bell inequalities is at the $4.5\sigma$ level |
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