Measurement of B-0-(B)over-bar(0) flavor oscillations using jet-charge and lepton flavor tagging in p(p)over-bar collisions at root s=1.8 TeV

We present a measurement of the mass difference Delta m(d) for the B-0 meson and the statistical power of the b flavor tagging methods used. The measurement uses 90 pb(-1) of data from <p(p)over bar> collisions at root s=1.8 TeV collected with the CDF detector. An inclusive lepton trigger is used to collect a large sample of B hadron semileptonic decays. The mass difference Delta m(d) 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 Delta m(d)=(0.500+/-0.052+/-0.043)(h) over bar ps(-1), where the first uncertainty is statistical and the second uncertainty is systematic. The statistical powers (epsilon D-2) of the soft-lepton and jet-charge flavor taggers are (0.91+/-0.10 +/-0.11)% and (0.78+/-0.12+/-0.08)%, respectively. [S0556-2821(99)05417-X].