Associated production of charged Higgs and top at LHC: the role of the complete electroweak supersymmetric contribution

TL;DR

This paper calculates the complete NLO electroweak corrections to charged Higgs production with a top quark at the LHC within supersymmetric models, highlighting the significance of these corrections for different tan beta values.

Contribution

It provides the first comprehensive calculation of electroweak corrections in both Two Higgs Doublets and MSSM models, including the full set of Feynman diagrams.

Findings

Electroweak corrections are perturbatively small but can reach 20% at extreme tan beta values.

Corrections depend significantly on the tan beta parameter.

Complete one-loop corrections are essential for precise predictions.

Abstract

The process of charged Higgs production in association with a top quark at the LHC has been calculated at the complete NLO electroweak level both in a Two Higgs Doublets Model and in the Minimal Supersymmetric Standard Model, assuming a mSUGRA breaking scheme. We have numerically explored the size of the one-loop corrections in two typical supersymmetric scenarios, with particular attention to the tan beta dependence, and we have found that they remain perturbatively small but possibly sizable, reaching a 20% limit for extreme values of tan beta, when the complete set of Feynman diagrams is taken into account.