Abstract
Using a data sample collected at the resonance with the CLEO-c detector at the Cornell Electron Storage Ring, we report the first observation of . We also set upper limits for and that are about 2 orders of magnitude more restrictive than those obtained by previous experiments.
- Received 27 February 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.081801
©2009 American Physical Society