Calculation of fermionic two-loop contributions to muon decay
A. Freitas, S. Heinemeyer, W. Hollik, W. Walter, G. Weiglein
Abstract
The computation of the correction Δr in the W-Z mass correlation, derived from muon decay, is described at the two-loop level in the Standard Model. Technical aspects which become relevant at this level are studied, e.g. gauge-parameter independent mass renormalization, ghost-sector renormalization and the treatment of γ5. Exact results for Δr and the W mass prediction including O(α2) corrections with fermion loops are presented and compared with previous results of a next-to-leading order expansion in the top-quark mass.
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