A measurement of B0-B0 mixing in Z0 decays

1990 
Abstract We have observed B 0 - B 0 mixing in Z 0 → b b decays using hadronic events containing dileptons. The data sample corresponds to 118 200 hadron events at √ s ≈ M z . From a fit to the dilepton p and p ⊥ spectra, we determine the mixing parameter to be χ B =0.178 −0.040 +0.049 .
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