Single slepton production associated with a top quark at LHC in NLO QCD

Abstract

Single slepton production in association with a top quark at the CERN Large Hadron Collider (LHC) is one of the important processes in probing the R-parity violation couplings. We calculate the QCD next-to-leading order (NLO) corrections to the pp → tl − (tl + ) + X process at the LHC and discuss the impacts of the QCD corrections on kinematic distributions. We investigate the dependence of the leading order (LO) and the NLO QCD corrected integrated cross section on the factorization/renormalization energy scale, slepton, stop-quark and gluino masses. We find that the uncertainty of the LO cross section due to the energy scale is obviously improved by the NLO QCD corrections, and the exclusive jet event selection scheme keeps the convergence of the perturbative series better than the inclusive scheme. The results show that the polarization asymmetry of the top-quark will be reduced by the NLO QCD corrections, and the QCD corrections generally increase with the increment of thet 1 org mass value.

Automated simulations beyond the Standard Model: supersymmetry

“…In addition, NLO QCD corrections have been computed including superparticle decays for squark pair-production [116,117] 1 , while approximate NNLO threshold contributions [118][119][120], (electro)weak (EW) corrections [81,[121][122][123][124][125][126][127][128][129], and resummation effects at the NNLL level [130][131][132][133][134][135][136] have been considered for squark and gluino production. Moreover, effects originating from R-parity violation [137,138] and non-minimal flavour-violation [139][140][141] have also been explored. All of these results have been included in several publicly available computer programs, which are restricted to the evaluation of total rates.…”