5,636 research outputs found
Soft Gluon Resummation Effects in Single Slepton Production at Hadron Colliders
We investigate QCD effects in the production of a single slepton at hadron
colliders in the Minimal Supersymmetric Standard Model without R-parity. We
calculate the total cross sections and the transverse momentum distributions at
next-to-leading order in QCD. The NLO corrections enhance the total cross
sections and decrease the dependence of the total cross sections on the
factorization and renormalization scales. For the differential cross sections,
we resum all order soft gluon effects to give reliable predictions for the
transverse momentum distributions. We also compare two approaches to the
non-perturbative parametrization and found that the results are slightly
different at the Tevatron and are in good agreement at the LHC. Our results can
be useful to the simulation of the events and to the future collider
experiments.Comment: 26 pages, 12 figures, RevTeX4; Minor changes; Version to appear in
PR
Next-to-leading order QCD predictions for pair production of neutral Higgs bosons at the CERN Large Hadron Collider
We present the calculations of the complete NLO inclusive total cross
sections for pair production of neutral Higgs bosons through
annihilation in the minimal supersymmetric standard model at the CERN Large
Hadron Collider. In our calculations, we used both the DREG scheme and the DRED
scheme and found that the NLO total cross sections in the above two schemes are
the same. Our results show that the -annihilation contributions can
exceed ones of fusion and annihilation for ,
and productions when is large. In the case of , the
NLO corrections enhance the LO total cross sections significantly, which can
reach a few tens percent, while for , the corrections are relatively
small, and are negative in most parameter space. Moreover, the NLO QCD
corrections can reduce the dependence of the total cross sections on the
renormalization/factorization scale, especially for . We also use the
CTEQ6.1 PDF sets to estimate the uncertainty of LO and NLO total cross
sections, and find that the uncertainty arising from the choice of PDFs
increases with the increasing .Comment: 43 pages, 16 figures, minor changes, some references added, a version
to appear in PR
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