A Measurement of the tau->electron Branching Ratio

Details A Measurement of the tau->electron Branching Ratio A Measurement of the tau->electron Branching Ratio

1998-12-14

arxiv.org/abs/hep-ex/9812017v1

Phys.Lett.B447:134-146,1999

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, LaTeX, 5 eps figs included, submitted to Physics Letters B

Scientific paper

10.1016/S0370-2693(98)01553-6

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 alpha_s has been extracted and evolved to the Z0 mass scale, giving alpha_s = 0.1204 +- 0.0011(exp) +- 0.0019(theory).

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