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Low- and intermediate mass Higgs bosons decay preferably into fermion pairs.The one-loop electroweak corrections to the respective decay rates aredominated by a flavour-independent term of ${\cal O}(G_Fm_t^2)$. We calculatethe two-loop gluon correction to this term. It turns out that this correctionscreens the leading high-$m_t$ behaviour of the one-loop result by roughly10\%. We also present the two-loop QCD correction to the contribution inducedby a pair of fourth-generation quarks with arbitrary masses. As expected, theinclusion of the QCD correction considerably reduces the renormalization-schemedependence of the prediction.Comment: 14 pages, latex, figures 2-5 appended, DESY 94-08

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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