Two-loop electroweak contributions to r
Abstract
A review is given on the quantum correction r in the W--Z mass correlation at the electroweak two-loop level, as derived from the calculation of the muon lifetime in the Standard Model. Exact results for r 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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