Abstract
The deviations from electron-muon Universality induced by the higher-order corrections in the leptonic decays of the intermediate bosons are analyzed in the framework of the renormalizable theories of weak and electromagnetic interactions. Some general theorems are derived for the second-order weak and electromagnetic corrections which are valid for all renormalizable theories which incorporate electron-muon universality as a zeroth-order relation. The connection of our results with the theorem of cancellation of mass divergences is briefly discussed.
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