Abstract
We report the observation of the exclusive decay at the 7.5 standard deviation level using of data collected by the CDF II detector in collisions at at the Fermilab Tevatron. We measure the relative branching ratio . Using the world average value for , we find . This provides a lower bound at 95% C.L.
- Received 25 July 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.021803
©2008 American Physical Society