A Measurement of the tau->electron Branching Ratio
The OPAL Collaboration, G. Abbiendi et al
Abstract
The branching ratio for the decay tau->e nue nutau has been measured using Z0 decay data collected by the OPAL experiment at LEP. In total 33073 tau->e nue nutau candidates were identified from a sample of 186197 selected tau decays, giving a branching ratio of 17.81 +- 0.09(stat) + 0.06(sys)%. This result is combined with other measurements to test e-mu and mu-tau universality in charged-current weak interactions. Additionally, the strong coupling constant alphas has been extracted and evolved to the Z0 mass scale, giving alphas = 0.1204 +- 0.0011(exp) +- 0.0019(theory).
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