Measurement Of The B(0)-(B)Over-Bar(0) Mixing Parameter And The Z-]B(B)Over-Bar Forward-Backward Asymmetry

We have measured the time integrated B0-BBAR0 mixing parameter and the forward-backward asymmetry in the process e+e- --> bbBAR using hadronic events containing muons or electrons. The data sample corresponds to 1,044,000 hadronic decays of the Z. From a fit to the momentum and transverse momentum distributions for single lepton and dilepton events, we have determined the B0-BBAR0 mixing parameter to be chi(B) = 0.123 +/- 0.012 (stat.) +/- 0.008 (sys.), and the bbBAR forward-backward asymmetry at the effective center-of-mass energy square-root s = 91.30 GeV to be A(bbBAR) = 0.087 +/- 0.011 (stat.) +/- 0.004 (sys.) This measurement corresponds to a value of the effective electroweak mixing angle of sin2thetaBAR(w) = 0.2335 +/- 0.0021.