Abstract
We report the first branching fraction measurement of the decay . With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be . This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung.
- Received 28 January 1998
DOI:https://doi.org/10.1103/PhysRevLett.80.4123
©1998 American Physical Society