Phys. Rev. Lett. 62, 2233–2236 (1989)B0B¯0 mixing at the Υ(4S)Received 16 February 1989; published in the issue dated 8 May 1989 We have measured B0B¯0 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 B+B- 55% of the time and to B0B¯0 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. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.62.2233
DOI:
10.1103/PhysRevLett.62.2233
PACS:
13.20.Jf, 14.40.Jz
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