Calculation of fermionic two-loop contributions to muon decay
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0007129,
title = {Calculation of fermionic two-loop contributions to muon decay},
author = {A. Freitas and S. Heinemeyer and W. Hollik and W. Walter and G. Weiglein},
journal= {arXiv preprint arXiv:hep-ph/0007129},
year = {2009}
}
Comments
10 pages LaTeX including 4 figures, Talk given by A. F. at the 5th Zeuthen Workshop on Elementary Particle Theory "Loops and Legs in Quantum Field Theory", Bastei/Koenigstein, Germany, April 9--14, 2000; references updated