Top Quark Mediated Higgs Decay into Hadrons to Order alpha(s)**5
Abstract
We present in analytic form the O(alphas5) correction to the H->gg partial width of the standard-model Higgs boson with intermediate mass MH<2Mt. Its knowledge is useful because the O(alphas4) correction is sizeable (around 20%). For MH=120 GeV, the resulting QCD correction factor reads 1 + (215/12) alphas(5)(MH)/pi + 152.5 (alphas(5)(MH)/pi)2 + 381.5 (alphas(5)(MH)/pi)3 ≈ 1+0.65+0.20+0.02. The new four-loop correction increases the total Higgs-boson hadronic width by a small amount of order 1 promille and stabilizes significantly the residual scale dependence.
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