A Measurement of the tau -> mu nu nu Branching Ratio

Abstract

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) +- 0.0006(syst) has been used in conjunction with other OPAL measurements to test lepton universality, yielding the coupling constant ratios gmu/ge=1.0005+-0.0044 and gt/ge=1.0031+-0.0048, in good agreement with the Standard Model prediction of unity. A value for the Michel parameter eta = 0.004 +- 0.037 has also been determined and used to find a limit for the mass of the charged Higgs boson mH+- > 1.25 tan beta, in the Minimal Supersymmetric Standard Model.

19 pages, 5 figures, Submitted to Phys. Letts B

References in corpus (2)

• Precise Determination of the Z Resonance Parameters at LEP : Zedometry
• Measurement of the Branching Ratio for the Process b -> tau nu X

Cited by in corpus (10)

• Particle Dark Matter: Evidence, Candidates and Constraints
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• The Physics of Hadronic Tau Decays
• Charged-Higgs effects in a new B -> D tau nu differential decay distribution
• Thermal Dark Matter Through the Dirac Neutrino Portal
• Angular distribution asymmetry in tau^- --> pi^- pi^0 nu_tau decay in the two-Higgs-doublet model with large tan beta
• Effects of charged Higgs bosons in the deep inelastic process ν_τ {\cal N} \to τ^- X and the possibility of detecting tau-neutrinos at cosmic neutrino detectors