Abstract
Precise measurements are reported for the leptonic branching ratios of the lepton from the reaction e+e-+- 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 e or are Be=0.180 0.009 0.006 and B=0.183 0.009 0.005. A sample of e events gives BeB=0.0288 0.0017 0.0019. With the assumption of e- universality, these results are combined to give Be=0.178 0.005, which implies a lifetime of (2.85 0.09)×10-13 sec. © 1985 The American Physical Society.
Original language | English |
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Pages (from-to) | 2118-2121 |
Journal | Physical Review Letters |
Volume | 55 |
Issue number | 20 |
DOIs | |
Publication status | Published - 1 Jan 1985 |