A measurement of the Tau to Muon branching ratio
Date
2018-11-16
Authors
Kormos, Laura Lee
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Abstract
The Ƭ- → μ-vμvƬ 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 (Ƭ- → μ-vμvƬ) = 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 mH± = 1.0005 ± 0.0044 and gƬ/ge =
1.0031 ± 0.0048, in good agreement with the Standard Model prediction of unity. A
value for the Michel parameter η = 0.004 ± 0.037 has also been determined and used
to find a limit for the mass of the charged Higgs boson, mH± > 1.28 tan β, in the
Minimal Supersymmetric Standard Model.
Description
Keywords
Branching ratios (Nuclear physics), Leptons (Nuclear physics), Tau leptons, Minimal supersymmetric standard model, Higgs boson