Complete Two Loop Electroweak Contributions to the Muon Lifetime in the Standard Model
M. Awramik, M. Czakon
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 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 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.
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