Precise Predictions for Hadronic Higgs Decays

TL;DR

This paper presents high-precision theoretical calculations of hadronic Higgs decay modes, including jet rates and event shapes, to improve predictions for future Higgs factory experiments.

Contribution

It introduces the use of the generalized antenna formalism to compute NNLO jet rates and event shapes for Higgs decays, enabling detailed comparisons between decay channels.

Findings

Calculated NNLO jet rates for H→bb and H→gg decays.

Matched NNLO results with NNLL resummation for improved accuracy.

Quantified differences between dominant and sub-dominant decay modes.

Abstract

The prospect of future electron-positron colliders operating as "Higgs factories" in a clean experimental environment presents one of the most promising avenues for Higgs precision measurements. In order to capitalise on this, we need to have good theoretical control over these observables. In this talk, I will report on recent calculations in Hadronic Higgs decays, focusing in particular on the variations between the dominant $H\to b \bar{b}$ channel via a Yukawa interaction, and the sub-dominant $H\to gg$ channel. Using the newly-developed "generalised antenna formalism", we have been able to calculate jet-rates and classical QCD event-shape observables up to NNLO accuracy, providing us with the means to quantify the differences between the two decay modes. For a subset of observables, we also match these NNLO results to NNLL resummation to obtain valid predictions even in the back-to-back limit.