Two-loop electroweak correction of O(G_F M_t^2) to the Higgs-boson decay into photons

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

References in corpus (3)

• Two-loop light fermion contribution to Higgs production and decays
• Analytical Result for the Two-Loop QCD Correction to the Decay H --> 2 gamma
• Relation between bottom-quark MS-bar Yukawa coupling and pole mass

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