QCD corrections to the Higgs-boson decayH→γγ

We compute the two-loop QCD corrections to the decay $H\to \gamma \gamma$ in the heavy-top-quark limit. We present the subleading terms of $O\left(\frac{{\alpha }_s{M}_H^2}{M_t^2}\right)$ and discuss their importance in extensions of the standard model of electroweak symmetry breaking.