title: Two-loop virtual top-quark effect on Higgs-boson decay to bottom quarks.
abstract: In most of the mass range encompassed by the limits from the direct search and the electroweak precision tests, the Higgs boson of the standard model preferably decays to bottom quarks. We present, in analytic form, the dominant two-loop electroweak correction, of O(GF2mt4), to the partial width of this decay. It amplifies the familiar enhancement due to the O(GFmt2) one-loop correction by about +16% and thus more than compensates the screening by about -8% through strong-interaction effects of order O(alphasGFmt2).
authors.affiliation: II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Butenschön
authors.forename: Frank
authors.initials: F
authors.lastname: Fugel
authors.forename: Bernd A
authors.initials: BA
authors.lastname: Kniehl