Three-Loop O(alpha_s^2 G_F M_t^2) Corrections to Hadronic Higgs Decays

We calculate the top-quark-induced three-loop corrections of O(alpha_s^2 G_F M_t^2) to the Yukawa couplings of the first five quark flavours in the framework of the minimal standard model with an intermediate-mass Higgs boson, with mass M_H << 2M_t. The calculation is performed using an effective-Lagrangian approach implemented with the hard-mass procedure. As an application, we derive the O(alpha_s^2 G_F M_t^2) corrections to the H -> q q-bar partial decay widths, including the case q=b. The couplings of the Higgs boson to pairs of leptons and intermediate bosons being known to O(alpha_s^2 G_F M_t^2), this completes the knowledge of such corrections in the Higgs sector. We express the results both in the MS-bar and on-shell schemes of mass renormalization. We recover the notion that the QCD perturbation expansions exhibit a worse convergence behaviour in the on-shell scheme than they do in the MS-bar scheme.Comment: 23 pages (Latex), 9 figures (Postscript), accepted for publication in Nuclear Physics

Radiooekologische Auswirkungen des langjaehrigen Betriebs der kerntechnischen Anlagen des Kernforschungszentrums Karlsruhe auf dessen naehere Umgebung Befristete Einzeluntersuchungen in Erweiterung und Ergaenzung des routinemaessigen Ueberwachungsprogramms

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Untersuchungen zum Transport von Tritium in der Umwelt Abschlussbericht

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