Precise Measurement of the Lifetime of the Tau Lepton
The MAC Collaboration, . · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 2022
Data accumulated with a high-precision vertex drift chamber operating in the PEP detector MAC are used for a precise measurement of the lifetime of the T lepton.Results from a decay-length analysis of a sample in which one T decays into one charged particle and the other to three charged particles are combined with those from an impact-parameter analysis of an independent sample of events that includes both one-and three-prong tau decays.We find rT =0.309 f 0.019 ps, in agreement with the prediction from the measured leptonic branching ratio and r-p universality.