Abstract
We have measured B mixing by observing like-sign dilepton events in Υ(4S) decay. Assuming that the semileptonic branching fractions of the charged and neutral B mesons are equal and that the Υ(4S) decays to 55% of the time and to B 45% of the time, we measure the mixing parameter r to be 0.19±0.06±0.06, where the first error is statistical and the second is systematic.
- Received 16 February 1989
DOI:https://doi.org/10.1103/PhysRevLett.62.2233
©1989 American Physical Society