Complete Two Loop Bosonic Contributions to the Muon Lifetime in the Standard Model

Details Complete Two Loop Bosonic Contributions to the Muon Lifetime in the Standard Model Complete Two Loop Bosonic Contributions to the Muon Lifetime in the Standard Model

2002-08-12

arxiv.org/abs/hep-ph/0208113v2

Phys.Rev.Lett.89:241801,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, references added, final version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.89.241801

The last missing correction to the muon lifetime in the Standard Model at O(alpha^2) coming from gauge and Higgs boson loops is presented. The associated contribution to the parameter Delta r in the on-shell scheme ranges from 6 times 10^{-5} to -4 times 10^{-5} for Higgs boson masses from 100 GeV to 1 TeV. This result translates into a shift of the W boson mass which does not exceed +/- 1 MeV in the same range and amounts in particular to approximately -0.8 MeV for a 115 GeV Higgs boson.

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