Complete Two Loop Electroweak Contributions to the Muon Lifetime in the Standard Model
High Energy Physics - Phenomenology
2009-11-10 v2
Abstract
An independent result for the two loop fermionic contributions to the muon lifetime in the Standard Model is obtained. Deviations are found with respect to \cite{Freitas:2000gg}, which result in a shift of the W boson mass by approximately -1.3 MeV over the range of Higgs boson masses from 100 GeV to 1 TeV. Supplied with the bosonic contributions from \cite{Awramik:2002wn,Onishchenko:2002ve,Awramik:2002vu}, this shift, due to the complete electroweak contributions, varies from -2.4 MeV to -0.6 MeV. Additionally, a new test of the matching procedure defining the Fermi constant is presented, which uses fermion masses as infrared regulators.
Cite
@article{arxiv.hep-ph/0305248,
title = {Complete Two Loop Electroweak Contributions to the Muon Lifetime in the Standard Model},
author = {M. Awramik and M. Czakon},
journal= {arXiv preprint arXiv:hep-ph/0305248},
year = {2009}
}
Comments
11 pages, 5 figures, Tab. 3 corrected, reference added