Hadronic corrections to the muon decay

Abstract

We consider the O(alpha^2) hadronic corrections to the energy spectrum of the decay electron in muon decay. We find that the correction can be described, within good approximation, by a linear function in the electron energy. Explicit expressions for the form factors needed in an approach based on dispersion integrals are given.

Comments: LaTeX, 9 pages, 2 figures (in eps format), contribution to the Proceedings of QFTHEP-2001 (Moscow, Russia, September 2001), a brief (but updated) review of the results of hep-ph/0011221