A Measurement of the tau leptonic branching fractions

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1995) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 357, n° 4, p. 715-724 (1995)

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A sample of 25000 Z0 → τ+τ− events collected by the DELPHI experiment at LEP in 1991 and 1992 is used to measure the leptonic branching fractions of the τ lepton. The results are View the MathML source% and View the MathML source %. The ratio of the muon and electron couplings to the weak charged current is measured to be View the MathML source, satisfying e-μ universality. The leptonic branching fraction corrected to the value for a massless lepton, assuming e-μ universality, is found to be View the MathML source%.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1995). A Measurement of the tau leptonic branching fractions. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 357(4), 715-724. https://doi.org/10.1016/0370-2693(95)00987-V (Original work published 1995)