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hep-ph1998
Complete 2-loop Quantum Electrodynamic Contributions to the Muon Lifetime in the Fermi Model
Timo van Ritbergen, Robin G. Stuart
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, virtua…
hep-ph1998
Group theory factors for Feynman diagrams
T. van Ritbergen, A. N. Schellekens, J. A. M. Vermaseren
We present algorithms for the group independent reduction of group theory factors of Feynman diagrams. We also give formulas and values for a large number of group invariants in wh…
hep-ph1998
Hadronic Contributions to the Muon Lifetime
Timo van Ritbergen, Robin G. Stuart
Hadronic corrections to the muon lifetime are calculated in the Fermi theory in the presence of QED using dispersion relations. The result, after convolution of hadron data with th…