A Precise measurement of the tau lepton lifetime

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1996) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 365, n° 1-4, p. 448-460 (1996)

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Abstract
The tau lepton lifetime has been measured using three different methods with the DELPHI detector. Two measurements of one-prong decays are combined, accounting for correlations, giving a result of ττ = 291.8 ± 3.3 (stat.) ± 2.0(sys.) fs while the decay length distribution of three-prong decays gives the result ττ = 286.7 ± 4.9 (stat.) ±3.3 (sys.) fs. Combining the results presented here with previous DELPHI measurements, we get ττ = 291.4 ± 3.0 fs and find that the ratio of the coupling constant for tau decay relative to that for muon decay is 0.990 ± 0.009, compatible with lepton universality.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1996). A Precise measurement of the tau lepton lifetime. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 365(1-4), 448-460. https://doi.org/10.1016/0370-2693(95)01434-9 (Original work published 1996)