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Muon Decay Spectrum: Leading Logarithmic Approximation

Andrej Arbuzov, Andrzej Czarnecki, Andrei Gaponenko

hep-pharXiv:hep-ph/0202102

Abstract

O(alpha2 ln2(mmu/me)) QED corrections to the electron spectrum and angular distribution in muon decay are evaluated. Impact on the determination of Michel parameters is estimated. Current theoretical uncertainty in the muon decay distributions is discussed.

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