Abstract
We have observed the decay at the KTeV experiment at Fermilab. This decay presents a formidable background to the search for new physics in The 1997 data yielded a sample of 4 signal events, with an expected background of events. The branching ratio is with consistent with a QED calculation which predicts
- Received 23 December 1999
DOI:https://doi.org/10.1103/PhysRevD.62.112001
©2000 American Physical Society