A measurement of the tau to mu nu nu branching ratio

Details A measurement of the tau to mu nu nu branching ratio A measurement of the tau to mu nu nu branching ratio

2002-09-18

arxiv.org/abs/hep-ex/0209045v1

eConf C0209101 (2002) TU03

Physics

High Energy Physics

High Energy Physics - Experiment

Invited talk at the Seventh International Workshop on Tau Lepton Physics, (Tau02), Santa Cruz, Ca. USA, Sept. 2002, 10 pages,

Scientific paper

10.1016/S0920-5632(03)80304-3

The tau -> mu nu nu branching ratio has been measured using data collected from 1990 to 1995 by the OPAL detector at the LEP collider. The resulting value of B(tau->mu nu nu) = 0.1734 +/- 0.0009(stat) +/- 0.0005(syst) has been used in conjunction with other OPAL measurements to test lepton universality, yielding the coupling constant ratios g(mu)/g(e) = 1.0005 +/- 0.0043 and g(tau)/g(e) = 1.0031 +/- 0.0047, in good agreement with the Standard Model prediction of unity, and also to determine a value for the Michel parameter eta = 0.004 +/- 0.036. This is subsequently used to find a model-dependent limit of the mass for the charged Higgs boson, m(Higgs) > 1.30 tan(beta), in the Minimal Supersymmetric Standard Model.

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