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

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

1998-08-10

arxiv.org/abs/hep-ph/9808283v2

Phys.Rev.Lett.82:488-491,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevLett.82.488

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).

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