Abstract
We have measured the branching ratio for → using our full data set obtained during running periods in 1988, 1989, and 1990. The total number of candidates after a background subtraction is 707, which represents the largest sample to date of this rare decay mode. Our result is B(→)=(6.86±0.37)×, which is consistent with earlier results and very near the unitarity bound. The upper limit on B(→) is used to set an upper limit on the real part of the amplitude scrA(→); this is subsequently used to constrain the top quark mass and the Wolfenstein parameter ρ of the CKM matrix.
- Received 29 August 1994
DOI:https://doi.org/10.1103/PhysRevD.51.985
©1995 American Physical Society