W-+ H+- production and CP asymmetry at the LHC

TL;DR

This paper presents a comprehensive calculation of NLO electroweak corrections to W±H∓ production at the LHC within the complex MSSM, revealing significant CP-violating asymmetries mainly from the gluon-gluon channel.

Contribution

It provides the first complete NLO electroweak correction calculation for b anti-b annihilation in the complex MSSM, including resummation and combination with other contributions.

Findings

Large CP-violating asymmetry observed, mainly from the gg channel.

Electroweak corrections significantly affect production rates and asymmetries.

Resummation improves the accuracy of bottom-Higgs coupling predictions.

Abstract

The dominant contributions to W-+ H+- production at the LHC are the tree-level b anti-b annihilation and the gg fusion. We perform for the case of the complex MSSM a complete calculation of the NLO EW corrections to the b anti-b annihilation channel and a consistent combination with other contributions including the standard and SUSY QCD corrections and the gg fusion, with resummation of the leading radiative corrections to the bottom-Higgs couplings and the neutral Higgs-boson propagators. We observe a large CP-violating asymmetry, arising mainly from the gg channel.