QCD corrections to excited lepton (pair) production at LHC

Abstract

We consider excited lepton ($\bar{l^*}l {\rm or} \bar{l^*}l^*$) production in the context of effective theories with being four-fermion contact interaction at LHC. We also consider the two body decay mode of excited lepton ($l^*$) to standard model fermion($l$) and a gauge boson $V(\equiv \gamma,Z,W)$. We have performed next-to-leading order (NLO) QCD corrections to this process. In spite of non-renormalizable nature of the interaction, the higher order QCD corrections are possible and meaningful. We have shown that these corrections can be substantial and significant. By considering the issue of scale dependence, it is shown that the scale dependence of the NLO cross sections are greatly reduced as compare to leading order (LO) cross section.