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Corrections of O(α_s^2) to the Decay of an Intermediate-Mass Higgs Boson into Two Photons

Matthias Steinhauser
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Abstract

The QCD correction of $O(α_s^2)$ 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 M_t, we find large coefficients for the power-suppressed terms whereas in the $\overline{MS}$ scheme the coefficients are tiny.

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Matthias Steinhauser. 1996-12-18. Corrections of O(α_s^2) to the Decay of an Intermediate-Mass Higgs Boson into Two Photons. https://arxiv.org/abs/hep-ph/9612395

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