Updated measurement of the tau lepton lifetime
Abstract
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 tautau = 290.1 +- 1.5 +- 1.1 fs.
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