Radiative Corrections to $H^0\to WW/ZZ$ in the MSSM

TL;DR

This paper calculates electroweak radiative corrections to the decay of the heavy MSSM Higgs boson into weak gauge bosons, highlighting their significance despite suppressed tree-level couplings.

Contribution

It provides the first detailed calculation of electroweak  corrections to heavy MSSM Higgs decays into gauge bosons, emphasizing their importance in certain parameter regions.

Findings

Electroweak corrections significantly affect decay widths.

Corrected partial widths are comparable across different $M_{A^0}$ values.

Effective Born decay widths can be small for large 

Abstract

The electroweak $\mathcal O(\alpha)$ radiative corrections to the decay of the heavy CP-even MSSM Higgs boson to weak gauge bosons are presented. Due to the suppression of the tree-level $H^0WW/H^0ZZ$ coupling, the electroweak contributions to the partial decay width are significant. Although the effective Born decay width can be rather small for certain $M_{A^0}$ values (especially for large $\tan\beta$), the corrected partial widths at different values of $M_{A^0}$ are of comparable size.