M. Acciarri et al., MEASUREMENT OF THE B(0)-(B)OVER-BAR(0) MIXING PARAMETER AND THE Z-]B(B)OVER-BAR FORWARD-BACKWARD ASYMMETRY, Physics letters. Section B, 335(3-4), 1994, pp. 542-553
We have measured the time integrated B0-BBAR0 mixing parameter and the
forward-backward asymmetry in the process e+e- --> bbBAR using hadron
ic events containing muons or electrons. The data sample corresponds t
o 1,044,000 hadronic decays of the Z. From a fit to the momentum and t
ransverse momentum distributions for single lepton and dilepton events
, we have determined the B0-BBAR0 mixing parameter to be chi(B) = 0.12
3 +/- 0.012 (stat.) +/- 0.008 (sys.), and the bbBAR forward-backward a
symmetry 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 mea
surement corresponds to a value of the effective electroweak mixing an
gle of sin2thetaBAR(w) = 0.2335 +/- 0.0021.