Two-loop electroweak corrections to the Higgs-boson decay image Original Research Article

The complete set of two-loop electroweak corrections to the decay width of the Higgs boson into two photons is presented. Two-loop contributions involving weak bosons and the top quark are computed in terms of an expansion in the Higgs external momentum. Adding these results to the previously known light fermion contributions, we find that the total electroweak corrections for a Higgs boson with image are moderate and negative, between image. Combination with the QCD corrections, which are small and positive, gives a total correction to the one-loop results of image.