Radiative corrections to top quark decay into charged Higgs at the Tevatron

TL;DR

This paper calculates significant one-loop electroweak radiative corrections to the top quark decay into a charged Higgs, impacting the interpretation of experimental data in supersymmetric and two-Higgs-doublet models.

Contribution

It provides the first detailed computation of electroweak radiative corrections to this decay process using a physically motivated tan(beta) definition.

Findings

Corrections are large in MSSM and 2HDM.

Impacts interpretation of Tevatron data.

No model-independent bounds in tan(beta)-MH+ plane.

Abstract

We present the computation of the leading one-loop electroweak radiative corrections to the non-standard top quark decay width Gamma(t->H+ b), using a physically motivated definition of tan(beta). We find that the corrections are large, both in the Minimal Supersymmetric Standard Model (MSSM) and the Two-Higgs-Doublet Model (2HDM). These corrections have an important effect on the interpretation of the Tevatron data, leading to the non-existence of a model-independent bound in the tan(beta)-MH+ plane.