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arXiv · hep-ph/9606310

Heavy-Higgs Lifetime at Two Loops

A. Frink·B. A. Kniehl·D. Kreimer·K. Riesselmann
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Abstract

The Standard-Model Higgs boson with mass $ M_H >> 2M_Z $ decays almost exclusively to pairs of $W$ and $Z$ bosons. We calculate the dominant two-loop corrections of $ O( G_F^2 M_H^4 )$ to the partial widths of these decays. In the on-mass-shell renormalization scheme, the correction factor is found to be $ 1 + 14.6 % (M_H/TeV)^2 + 16.9 % (M_H/TeV)^4 $, where the second term is the one-loop correction. We give full analytic results for all divergent two-loop Feynman diagrams. A subset of finite two-loop vertex diagrams is computed to high precision using numerical techniques. We find agreement with a previous numerical analysis. The above correction factor is also in line with a recent lattice calculation.

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A. Frink, B. A. Kniehl, D. Kreimer, K. Riesselmann. 1996-06-12. Heavy-Higgs Lifetime at Two Loops. https://doi.org/10.1103/physrevd.54.4548

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