Abstract
The branching fraction for is measured from data accumulated with the Mark II detector at PEP. Four events are observed with an estimated hadronic background of () events and a background from of () events. This results in a measured branching fraction of (0.16±0.08±0.04)%. The candidate events are used to establish an upper limit of 125 MeV/ on the mass at the 95% confidence level.
- Received 1 April 1985
DOI:https://doi.org/10.1103/PhysRevLett.54.2489
©1985 American Physical Society