Quark-flavour violation in $h^0 \to b \bar{b}$ in the MSSM at one-loop level

TL;DR

This paper calculates the decay width of the 125 GeV Higgs boson into bottom quarks within the MSSM, considering quark-flavour violation effects at one-loop, and compares results with the Standard Model.

Contribution

It provides the first detailed one-loop analysis of $h^0 o b ar{b}$ decay in the MSSM with quark-flavour violation, including mixing effects and QFV constraints.

Findings

QFV parameters significantly affect the decay width.

The decay width can differ notably from the Standard Model prediction.

Results are consistent with current B-meson data constraints.

Abstract

We compute the width of the decay $h^0$ (125 GeV) $\to b \bar{b}$ at next-to-leading order in the general MSSM with quark-flavour violation (QFV). We study the effect of mixing between the second and the third generation of squarks, taking into account the constraints on QFV from B-meson data. We discuss the renormalisation of the process as well as the resummation of the bottom Yukawa coupling at large $\tan \beta$. We show numerical results on the decay width $\Gamma(h^0 \to b \bar{b})$ as a function of the involved QFV parameters and compare them with the corresponding width in the Standard Model.