Complete 2-loop Quantum Electrodynamic Contributions to the Muon Lifetime in the Fermi Model

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dc.creatorvan Ritbergen, Timo
dc.creatorStuart, Robin G.
dc.date1998-08-10
dc.date1998-12-07
dc.date.accessioned2026-07-07T11:47:51Z
dc.date.available2026-07-07T11:47:51Z
dc.descriptionThe complete 2-loop quantum electrodynamic corrections to the muon lifetime are calculated in the Fermi theory. The exact result for the effects of virtual and real photons, virtual electrons, muons as well as e+e- pair creation is Delta Gamma_QED = Gamma_0(alpha/pi)^2[(156815/5184)-(1036/27)zeta(2)-(895/36)zeta(3) +(67/8)zeta(4)+53zeta(2)ln(2)] = Gamma_0(alpha/pi)^2(6.743) where Gamma_0 is the tree-level width. The theoretical error in the value of the Fermi coupling constant, G_F, is now rendered negligible compared to the experimental uncertainty coming from the measurement of the muon lifetime. The overall error in G_F is then roughly halved giving G_F = (1.16637 +/- 0.00001) x 10^(-5) GeV^(-2).
dc.description5 pages REVTeX. 2 figures. Uses axodraw.sty. References added, minor changes in text. To be published in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/hep-ph/9808283
dc.identifierhttp://arxiv.org/abs/hep-ph/9808283
dc.identifierPhys.Rev.Lett.82:488-491,1999
dc.identifierdoi:10.1103/PhysRevLett.82.488
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202718
dc.subjectHigh Energy Physics - Phenomenology
dc.titleComplete 2-loop Quantum Electrodynamic Contributions to the Muon Lifetime in the Fermi Model
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