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

TL;DR

This paper calculates NLO QCD corrections for single slepton production with a top quark at the LHC, improving theoretical predictions and analyzing the impact on cross sections and top polarization.

Contribution

It provides the first detailed NLO QCD correction calculation for this process, enhancing the accuracy of cross section and polarization predictions in R-parity violating SUSY models.

Findings

NLO corrections reduce the scale uncertainty of the cross section.

Exclusive jet schemes improve perturbative convergence.

QCD corrections decrease top polarization asymmetry.

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 $pp \to t\slep^{-}(\bar{t}\slep^{+})+X$ 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 the $\tilde{t}_1$ or $\tilde{g}$ mass value.