QCD corrections to excited lepton (pair) production at LHC

TL;DR

This paper calculates next-to-leading order QCD corrections for excited lepton pair production at the LHC, demonstrating that these corrections are significant and reduce theoretical uncertainties from scale dependence.

Contribution

It provides the first detailed NLO QCD correction analysis for excited lepton production via contact interactions at the LHC.

Findings

NLO corrections are substantial and enhance the production cross section.

QCD corrections significantly reduce the scale dependence of the predictions.

The results improve the theoretical precision for excited lepton searches at the 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.