  A new measurement of the mean lifetime of the tau lepton is presented. Three
different analysis methods are applied to a sample of 90000 tau pairs,
collected in 1993 and 1994 with the ALEPH detector at LEP. The average of this
measurement and those previously published by ALEPH is tau_tau = 290.1 +- 1.5
+- 1.1 fs.

High Energy Physics - Experiment