The mean lifetime of the lepton is measured in a sample of 25700 pairs collected in 1992 with the ALEPH detector at LEP. A new analysis of the 1-1 topology events is introduced. In this analysis, the dependence of the impact parameter sum distribution on the daughter track momenta is taken into account, yielding improved precision compared to other impact parameter sum methods. Three other analyses of the one- and three-prong decays are updated with increased statistics. The measured lifetime is29353117fs . Including previous (1989-1991) ALEPH measurements, the combined lifetime is29372716fs .
Measurement of the τ lepton lifetime / D. Buskulic et al.. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - ELETTRONICO. - 70:(1996), pp. 549-559. [10.1007/s002880050132]
Measurement of the τ lepton lifetime
FOCARDI, ETTORE
1996
Abstract
The mean lifetime of the lepton is measured in a sample of 25700 pairs collected in 1992 with the ALEPH detector at LEP. A new analysis of the 1-1 topology events is introduced. In this analysis, the dependence of the impact parameter sum distribution on the daughter track momenta is taken into account, yielding improved precision compared to other impact parameter sum methods. Three other analyses of the one- and three-prong decays are updated with increased statistics. The measured lifetime is29353117fs . Including previous (1989-1991) ALEPH measurements, the combined lifetime is29372716fs .
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