Muon decay, after more than fifty years of experimental and theoretical investigations, has been established as a firm basis for the Standard Model of Elec-troweak Interactions. The decay products of the muon have been identified, and the Lorentz structure of the decay interaction has been determined completely from existing experiments in a model-independent way. Together with the completely anologous leptonic r decays it continues to be an important and sensitive testing ground for deviations from the Standard Model.
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