A Measurement of the tau lifetime

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1993) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 302, n° 2-3, p. 356-368 (1993)

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The tau lepton lifetime is measured using four different methods with the DELPHI detector. Three measurements using one prong decays are combined, accounting for correlations, resulting in ττ=298 ±7 (stat.)±4 (syst.) fs while the decay length distribution of three prong decays gives ππ=298±13 (stat)±(syst.) fs. The combined result is ττ=298±7 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay is found to be 0.985±0.013, compatible with lepton universality.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1993). A Measurement of the tau lifetime. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 302(2-3), 356-368. https://doi.org/10.1016/0370-2693(93)90409-B (Original work published 1993)