Corrections of O(αs2) to the Decay of an Intermediate-Mass Higgs Boson into Two Photons
Matthias Steinhauser
Abstract
The QCD correction of O(αs2) to the decay of the Standard Model Higgs boson into two photons is presented. We consider the contribution coming from diagrams with a heavy top quark as virtual particle. The first three terms of the expansion in the inverse top mass is calculated. Expressing the result through the on-shell top mass Mt, we find large coefficients for the power-suppressed terms whereas in the MS scheme the coefficients are tiny.
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