Electroweak corrections to $gg\to H^{-}t\bar{b}$ at the LHC

TL;DR

This paper presents a comprehensive NLO electroweak calculation for the dominant gluon-gluon fusion process producing a charged Higgs and top-bottom quark pair at the LHC within the complex MSSM, highlighting the significance of electroweak effects and complex phases.

Contribution

It provides the first complete NLO electroweak correction calculation for $gg o H^- t ar{b}$ in the complex MSSM, including resummation of leading radiative corrections.

Findings

Electroweak corrections can be significant beyond leading order.

Complex phases of soft-breaking parameters have a sizable impact.

Effective bottom-Higgs couplings improve the accuracy of predictions.

Abstract

The dominant contribution to $H^- t\bar{b}$ production at the LHC is the gluon-gluon fusion parton subprocess. We perform for the case of the complex MSSM a complete calculation of the NLO electroweak contributions to this channel. The other small contributions with quarks or photon in the initial state are calculated at tree level. The results are improved by using the effective bottom-Higgs couplings to resum the leading radiative corrections. We find that, beyond these leading corrections, the NLO electroweak contributions can be still be significant. The effect of the complex phases of the soft-breaking parameters is found to be sizable.