Abstract
We report on a search for the decay carried out as a part of the KTeV experiment at Fermilab. This decay is expected to have a significant violating contribution and a direct measurement will either support the Cabibbo-Kobayashi-Maskawa mechanism for violation or point to new physics. Two events were observed in the 1997 data with an expected background of events, and we set an upper limit at the confidence level.
- Received 23 December 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.5279
©2000 American Physical Society