Abstract
We present the first observation of beta decay, using the KTeV beam line and detector at Fermilab. We have identified 176 beta decay events after subtracting a 7 event background. Normalization to 41 024 simultaneously collected decays yields a branching ratio of . The flavor symmetric quark model calculation agrees with this result.
- Received 23 December 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.3751
©1999 American Physical Society