Calculation of fermionic two-loop contributions to muon decay

Details Calculation of fermionic two-loop contributions to muon decay Calculation of fermionic two-loop contributions to muon decay

2000-07-13

arxiv.org/abs/hep-ph/0007129v2

Nucl.Phys.Proc.Suppl. 89 (2000) 82-87

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages LaTeX including 4 figures, Talk given by A. F. at the 5th Zeuthen Workshop on Elementary Particle Theory "Loops and L

Scientific paper

10.1016/S0920-5632(00)00827-6

The computation of the correction \Delta r 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 \gamma_5. Exact results for \Delta r and the W mass prediction including O(\alpha^2) 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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