Abstract
The branching ratio of the rare decay has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate events using as a source of tagged s. The expected background is events, predominantly from high mass decays. We have measured , which is above the unitary bound from and within the range of theoretical expectations from the standard model.
- Received 24 October 2006
DOI:https://doi.org/10.1103/PhysRevD.75.012004
©2007 American Physical Society