Paper
Higgs Decay to Order α_s^4
Authors
K. G. Chetyrkin, B. A. Kniehl, M. Steinhauser
Abstract
We present in analytic form the three-loop O(α_s^2) correction to the H -> gg partial width of the standard-model Higgs boson with intermediate mass M_H << 2 M_t. Its knowledge is required because the O(α_s) correction is so sizeable that the theoretical prediction to this order is unlikely to be reliable. For M_H=100 GeV, the resulting QCD correction factor reads . The new three-loop correction increases the Higgs-boson hadronic width by an amount of order 1%.