One-loop electroweak effects on stop-chargino production at LHC

TL;DR

This paper calculates electroweak one-loop corrections to stop-chargino production at the LHC within the MSSM, showing these effects are small but important for precise theoretical predictions.

Contribution

It provides the first complete electroweak one-loop analysis of stop-chargino production in the MSSM, including angular and invariant mass distributions.

Findings

Electroweak effects are at most a few percent.

Born level expressions are sufficient for LHC accuracy.

Distributions are characterized for various benchmark points.

Abstract

The process of stop-chargino production at LHC has been calculated in the Minimal Supersymmetric Standard Model at the complete electroweak one-loop level, assuming a mSUGRA symmetry breaking scheme. Several properties of the angular and invariant mass distributions of the basic bottom-gluon to stop-chargino amplitudes have been derived. For a meaningful collection of different benchmark points the overall electroweak one-loop effects are at most of the order of a few percent. At the realistically expected LHC accuracy, the main supersymmetric electroweak features of the process can be therefore essentially derived in this theoretical scheme from the simple Born level expressions.