par Abreu, Pedro;Vander Velde, Catherine 
;Bertrand, Daniel ; [et al.]
Référence Physics letters. Section B, 365, page (448-460)
Publication Publié, 1996
;Bertrand, Daniel ; [et al.]Référence Physics letters. Section B, 365, page (448-460)
Publication Publié, 1996
Article révisé par les pairs
| Résumé : | 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 ofττ = 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. |
