Complete Two-Loop Corrections to H -> gamma gamma
Giampiero Passarino, Christian Sturm, Sandro Uccirati
TL;DR
This paper provides comprehensive two-loop quantum corrections to the Higgs decay into two photons, incorporating QCD and electroweak effects across all kinematic regions using a numerical approach.
Contribution
It introduces a numerical method for calculating complete two-loop corrections to H -> gamma gamma, including complex masses for threshold regions, enhancing precision in theoretical predictions.
Findings
Complete two-loop corrections calculated for all kinematic regions.
Inclusion of complex masses improves accuracy near WW threshold.
Results enable more precise comparisons with experimental data.
Abstract
In this paper the complete two-loop corrections to the Higgs-boson decay, H -> gamma gamma, are presented. The evaluations of both QCD and electroweak corrections are based on a numerical approach. The results cover all kinematical regions, including the WW normal-threshold, by introducing complex masses in the relevant (gauge-invariant) parts of the LO and NLO amplitudes.
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