Abstract
We report on the analysis of the rare decay the 1997 data from the KTeV experiment at Fermilab. A total of 9327 candidate events are observed with background, representing a factor of 40 increase in statistics over the current world sample. We find that . The form factor parameter is measured to be . In addition, we make the first measurement of the parameter from the D’Ambrosio-Isidori-Portolés form factor, finding . In that model, this measurement limits the Cabibbo-Kobayashi-Maskawa parameter .
- Received 30 January 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.071801
©2001 American Physical Society