We update the calculation of the decays of the {τ} lepton into various modes using recent data on electron-positron annihilation into hadrons plus bounds that follow from isotopic-spin conservation. Comparison is made with exclusive branching-ratio data and inclusive charged-prong-distribution measurements in {τ} decays, and the difficulty in accounting for all the one-charged-prong decays as a sum of exclusive decay modes is discussed.
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Gilman et al. (1985) studied this question.
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