Higgs-Boson Decays: Updates

TL;DR

This paper summarizes recent theoretical developments in Higgs-boson decay calculations, including finite NLO effects, branching fractions, and Dalitz decay results, which are crucial for future collider measurements of the strange-Yukawa coupling.

Contribution

It introduces extended computational grids for NLO mass effects, provides explicit branching fraction numbers, and presents first results on Higgs Dalitz decays relevant for Yukawa coupling determination.

Findings

Extended grids for NLO effects in Higgs decays

Explicit branching fractions for $H\to s\bar{s}$

First results on Higgs Dalitz decays

Abstract

In this contribution, new developments for the Standard Model Higgs-boson decays will be summarized. This addresses extensions of the grids used by {\tt Hdecay} to implement finite NLO mass effects for $H\to gg$ as well as explicit numbers for the branching fraction for the strange-Yukawa induced part of $H\to s\bar s$ together with the related uncertainties. In addition, first results of the strong and weak Dalitz decays of the Higgs-boson decays $H\to s\bar s + g/\gamma$ are presented. The Dalitz decays define the separation between the Yukawa-induced part and the continuum, that is not induced by the strange-Yukawa coupling, and thus pave the way towards a solid determination of the strange-Yukawa coupling at future $e^+e^-$ colliders, but will also be relevant for solid bounds on the strange-Yukawa coupling at the LHC.