par Abreu, Pedro;Bertrand, Daniel 
; [et al.]
Référence Physics letters. Section B, 267, 3, page (422-430)
Publication Publié, 1991
; [et al.]Référence Physics letters. Section B, 267, 3, page (422-430)
Publication Publié, 1991
Article révisé par les pairs
| Résumé : | The lifetime of the tau lepton has been measured by two independent methods using a silicon microvertex detector installed in the DELPHI detector. The signed impact parameter distribution of the one prong decays yielded a lifetime of ττ = 321 ± 36 (stat.) ± 16 (syst.) fs, while the decay length distribution of three prong decays gave the result ττ = 310 ± 31 (stat.) ± 9 (syst.) fs. The final value of the combined result was ττ = 314 ± 25 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay was found to be 0.95 ± 0.04, compatible with the hypothesis of lepton universality. |
