Measurement of the Lifetime of the Tau Lepton

Details Measurement of the Lifetime of the Tau Lepton Measurement of the Lifetime of the Tau Lepton

2000-03-16

arxiv.org/abs/hep-ex/0003023v1

Phys.Lett.B479:67-78,2000

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1016/S0370-2693(00)00347-6

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 tau_tau = 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).

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