Abstract
We report the first observation of , with a branching fraction and a statistical significance . Data were acquired with the CLEO III detector at the CESR symmetric collider. This is the first process observed involving a -quark spin flip. For related transitions, 90% confidence limits in units of are , , , and .
- Received 18 June 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.192001
©2008 American Physical Society