845 research outputs found
Associated Production of Neutral Higgs Boson with Squark Pair in the Minimal Supersymmetric Standard Model with Explicit CP Violation at the CERN LHC
We investigate the associated production of neutral Higgs boson with squark
pair in the minimal supersymmetric standard model with and without explicit CP
violation, respectively. We show that the dominant productions in both cases
are always ones of the lightest neutral Higgs boson associated with the
lightest stop pair, which can reach a few pb, in the ranges of parameters
allowed by constraints from the electric dipole moment experiments. In most of
the parameter space, the total cross sections in the case with explicit CP
violation are significantly enhanced, compared with ones without explicit CP
violation. For some special parameters, several orders of magnitude enhancement
can be obtained.Comment: 4 pages, 7 figures, version to appear in PR
Updated predictions for graviton and photon associated production at the LHC
We present updated predictions on the inclusive total cross sections,
including the complete next-to-leading order QCD corrections, for the graviton
and photon associated production process in the large extra dimensions model at
the LHC with a center-of-mass energy of 7 and 8 TeV, using the parameters
according to the requirements of the ATLAS and CMS Collaborations. Moreover, we
also discuss in detail the dependence on the transverse momentum cut and
uncertainties due to the choices of scales and parton distribution functions.Comment: 5 pages, 3 figures, 2 tables, version published in PR
Top-squark mixing effects in the supersymmetric electroweak corrections to top quark production at the Tevatron
Taking into account the mixing effects between left- and right-handed
top-squarks, we calculate the genuine supersymmetric eletroweak correction to
top quark production at the Tevatron in the minimal supersymmetric model. The
analytic expressions of the corrections to both the parton level cross section
and the total hadronic cross section are presented. Some numerical examples are
also given to show the size of the corrections.Comment: 11 pages, 3 figures, available at reques
Probing the baryogenesis and dark matter relaxed in phase transition by gravitational waves and colliders
The cosmological phase transition with Q-balls production mechanism can
explain the baryogenesis and dark matter simultaneously, where constraints on
dark matter masses and reverse dilution are significantly relaxed. We study how
to probe this scenario by collider signals at QCD next-to-leading order and
gravitational wave signals.Comment: 22 pages,9 figures,4 tables, published in Phys.Rev.
Electroweak baryogenesis in the framework of the effective field theory
We study the electroweak baryogenesis in the framework of the effective field
theory. Our study shows that by introducing a light singlet scalar particle and
a dimension-5 operator, it can provide the strong first order phase transition
and the source of the CP-violation during the phase transition, and then
produce abundant particle phenomenology at zero temperature. We also show the
constraints on the new physics scale from the observed baryon-to-photon ratio,
the low-energy experiments, and the LHC data.Comment: 12 pages, 5 figures, 1 table; version published in Phys.Rev.
Renormalization group improved predictions for production at hadron colliders
We study the factorization and resummation of the production
at hadron colliders. The cross section in the threshold limit can be factorized
into a convolution of hard and soft functions and parton distribution functions
with the soft-collinear effective theory. We calculate the next-to-leading
order soft function for the associated production of the heavy quark pair and
colorless particle, and we perform the resummation calculation with the
next-to-next-to-leading logarithms accuracy. Our results show that the
resummation effects reduce the dependence of the cross section on the scales
significantly and increase the total cross section by compared with
NLO QCD results.Comment: 23 pages, 7 figures and 2 tables; final version in PR
Next-to-leading order QCD predictions for associated production of top squarks and charginos at the CERN LHC
We present the calculations of the complete next-to-leading order (NLO)
inclusive total cross sections for the associated production processes in the Minimal Supersymmetric Standard Model at
the CERN Large Hadron Collider. Our calculations show that the total cross
sections for the production for the lighter top
squark masses in the region 100 GeV 160 GeV can reach 1 pb
in the favorable parameter space allowed by the current precise experiments,
and in other cases the total cross sections generally vary from 10 fb to
several hundred fb except both 500 GeV and the
production channel. Moreover, we find that the
NLO QCD corrections in general enhance the leading order total cross sections
significantly, and vastly reduce the dependence of the total cross sections on
the renormalization/factorization scale, which leads to increased confidence in
predictions based on these results.Comment: 42 pages, 13 figures, RevTex4. Journal-ref adde
Higgs Boson Production via Gluon Fusion in the Standard Model with four Generations
Higgs bosons can be produced copiously at the LHC via gluon fusion induced by
top and bottom quark loops, and can be enhanced strongly if extra heavy quarks
exist. We present results for Higgs +zero-, one- and two-jet production at the
LHC, in both the Standard Model and the 4th generation model, by evaluating the
corresponding heavy quark triangle, box and pentagon Feynman diagrams. We
compare the results by using the effective Higgs-gluon interactions in the
limit of heavy quarks with the cross sections including the full mass
dependences. NLO effects with full mass dependence are included in the
inclusive Higgs boson production rate. Our results improve the theoretical
basis for fourth generation effects on the Higgs boson search at the LHC.Comment: Published version in PR
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