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

Abstract

The 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).

5 pages REVTeX. 2 figures. Uses axodraw.sty. References added, minor changes in text. To be published in Phys. Rev. Lett

References in corpus (3)

• The Large Quark Mass Expansion of Gamma (Z^0 -> hadrons) and Gamma(tau^- -> nu_tau + hadrons) in the Order alpha_s^3
• Perturbative Strong Interaction Corrections to the Heavy Quark Semileptonic Decay Rate
• Hadronic Contributions to the Muon Lifetime

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