Measurement of the Lifetime of the Tau Lepton
L3 Collaboration
Abstract
The tau lepton lifetime is measured with the L3 detector at LEP using the complete data taken at centre-of-mass energies around the Z pole resulting in tautau = 293.2 +/- 2.0 (stat) +/- 1.5 (syst) fs. The comparison of this result with the muon lifetime supports lepton universality of the weak charged current at the level of six per mille. Assuming lepton universality, the value of the strong coupling constant, alphas is found to be alphas(mtau2) = 0.319 +/- 0.015(exp.) +/- 0.014 (theory).
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