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[en] The two-loop OMIKRON (αsGFmt2) corrections to the b anti b decay rate of the Standard Model Higgs boson as well as its production via e+e-→ZH will be presented. These QCD corrections are obtained by using a low-energy theorem for light Higgs bosons compared to the top quark mass. The results yield strong screening effects of the OMIKRON (GFmt2) contributions. After that the two-loop QCD corrections to the γγ and gluonic decays of the Higgs bosons of the Standard Model and its minimal supersymmetric extension are discussed. While the corrections to the γγ decays remain small of OMIKRON (αs) they are huge ∝50-70% in the case of the gluonic decays. (orig.)
Source
Apr 1995; 16 p; ISSN 0418-9833; 
; FOERDERKENNZEICHEN BMFT 056HH93P; CONTRACT EEL CHRX-CT93-0357(DG12 COMA); Invited talk presented at the Ringberg Workshop ''Perspectives for Electroweak Interactions in e+e- Collisions, February 5-8, 1995.
; FOERDERKENNZEICHEN BMFT 056HH93P; CONTRACT EEL CHRX-CT93-0357(DG12 COMA); Invited talk presented at the Ringberg Workshop ''Perspectives for Electroweak Interactions in e+e- Collisions, February 5-8, 1995.