Two-loop electroweak correction of O(G_F M_t^2) to the Higgs-boson decay into photons
arXiv:hep-ph/0405232 · doi:10.1016/j.nuclphysb.2004.09.018
Abstract
We compute the dominant two-loop electroweak correction, of O(G_F M_t^2), to the partial width of the decay of an intermediate-mass Higgs boson into a pair of photons. We use the asymptotic-expansion technique in order to extract the leading dependence on the top-quark mass plus four expansion terms that describe the dependence on the W- and Higgs-boson masses. This correction reduces the Born result by approximately 2.5%. As a by-product of our analysis, we also recover the O(G_F M_t^2) correction to the partial width of the Higgs-boson decay to two gluon jets.
15 pages, 7 figures
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