Abstract
Precise measurements are reported for the leptonic branching ratios of the lepton from the reaction observed with the MAC detector operating at the SLAC storage ring PEP. Results from samples in which one decays into three charged particles and the other to or are and . A sample of events gives . With the assumption of universality, these results are combined to give , which implies a lifetime of (2.85±0.09)× sec.
- Received 5 August 1985
DOI:https://doi.org/10.1103/PhysRevLett.55.2118
©1985 American Physical Society