Complete three-loop QCD corrections to the decay H -> \gamma \gamma

TL;DR

This paper calculates the complete three-loop quantum chromodynamics corrections to the Higgs boson decay into two photons, providing a precise theoretical prediction for this process at high order.

Contribution

It presents the first complete three-loop singlet QCD corrections to Higgs decay into two photons, refining the theoretical understanding of this decay channel.

Findings

Decay width now known at O(G_F α^2 α_s^2, G_F α^3)

Improved calculation for non-singlet case

Enhanced precision in Higgs decay predictions

Abstract

We present the result for the three-loop singlet QCD corrections to the decay of a Higgs boson into two photons and improve the calculation for the non-singlet case. With the new result presented, the decay width Gamma(H -> \gamma \gamma) is completely known at O(G_F \alpha ^2 \alpha_s^2, G_F \alpha ^3).