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Measurement of the tau lifetime
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https://doi.org/10.1103/physrevd.37.1750Abstract
We have used a high-resolution drift chamber in the Mark II detector at the SLAC storage ring PEP to measure the lifetime of τ leptons produced in e+e- annihilations at 29 GeV. Based on the flight-path distribution of 807 three-prong τ decays, the lifetime is found to be (2.88±0.16 ±0.17)×10-13 sec, in agreement with expectations for e-μ-τ universality.
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