A complete one-loop calculation of electroweak supersymmetric effects in $t$-channel single top production at LHC

TL;DR

This paper presents a comprehensive one-loop electroweak calculation within the MSSM for single top production at the LHC, revealing small overall effects and highlighting the limited impact of SUSY contributions in the mSUGRA scenario.

Contribution

It provides the first complete one-loop electroweak analysis of t-channel single top production in the MSSM, including QED effects and generalizing previous work.

Findings

Standard Model one-loop effects are a few percent.

Weak and QED contributions tend to cancel each other.

SUSY effects are generally modest in the mSUGRA scenario.

Abstract

We have computed the complete one-loop electroweak effects in the MSSM for single top (and single antitop) production in the $t$-channel at hadron colliders, generalizing a previous analysis performed for the dominant $dt$ final state and fully including QED effects. The results are quite similar for all processes. The overall Standard Model one-loop effect is small, of the few percent size. This is due to a compensation of weak and QED contributions that are of opposite sign. The genuine SUSY contribution is generally quite modest in the mSUGRA scenario. The experimental observables would therefore only practically depend, in this framework, on the CKM $Wtb$ coupling.