Charged Higgs production at the LHC and CP asymmetries

TL;DR

This paper investigates CP violation in charged Higgs production at the LHC within the MSSM, analyzing asymmetries in production cross sections and decay channels, with potential asymmetries reaching around 12%.

Contribution

It provides an analytical calculation of CP asymmetries in charged Higgs production and decay at NLO in the MSSM, including detailed numerical analysis.

Findings

Asymmetry in $H^\pm$ production can reach approximately 12%.

Analytical expressions for CP asymmetry at NLO are derived.

Numerical analysis confirms potential observability of asymmetries.

Abstract

We study CP violation in associated production of a charged Higgs boson and a top quark at the LHC, $pp \to tH^\pm +X$. The asymmetry between the total cross sections for $H^+$ and $H^-$ production at next-to-leading order in the MSSM is calculated analytically and a detailed numerical analysis is performed. Furthermore, subsequent decays of $H^\pm$ to $tb$ and $ \tau^\pm \nu_\tau$ are considered. In the case with $H^\pm \to tb$ decay the asymmetry can go up to $\sim$~12%.