Abstract
A search for the decay → with significantly increased experimental sensitivity has yielded no events. The 90% confidence level limit on the branching ratio is B(→)<3.9×. When this data set is combined with earlier data the upper limit is 3.3×.
- Received 23 November 1992
DOI:https://doi.org/10.1103/PhysRevLett.70.1049
©1993 American Physical Society