Title: Measurement of the Lifetime of The tau lepton


 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 
     equal to 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, alpha_s is found to be
    alpha_s(m_(tau)^2) = 0.319 +- 0.015(exp) +- 0.014(theory).

Parallel 5,7
Plenary 3,6a
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*L3 paper 205 accepted from Phys Lett
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