Two-loop heavy Higgs correction to Higgs decay into vector bosons

Abstract

The leading m H radiative correction to the Higgs decay width into a pair of weak vector bosons is calculated at the two-loop level, using the equivalence theorem in Landau gauge. The result indicates the breakdown of perturbation theory if the Higgs boson is heavier than ∼ 930 GeV, in spite of the smallness of the one-loop radiative correction.