We present a measurement of the mass difference for the meson and the statistical power of the b flavor tagging methods used. The measurement uses of data from collisions at collected with the CDF detector. An inclusive lepton trigger is used to collect a large sample of B hadron semileptonic decays. The mass difference is determined from the proper time dependence of the fraction of B hadrons that undergo flavor oscillations. The flavor at decay is inferred from the charge of the lepton from semileptonic B decay. The initial flavor is inferred by determining the flavor of the other B hadron produced in the collision, either from its semileptonic decay (soft-lepton tag) or from its jet charge. The measurement yields , where the first uncertainty is statistical and the second uncertainty is systematic. The statistical powers of the soft-lepton and jet-charge flavor taggers are and , respectively.
- Received 16 March 1999
©1999 American Physical Society