An improved measurement of BO-O mixing in ZO decays

1992 
Abstract A more precise determination of the B 0 - B 0 mixing parameter in Z 0 decays based on a fourfold increase in statistics has been made using the 1990 and 1991 L3 data. The analysis of the dilepton events, muons and electrons, gives: χ B = 0.121 ± 0.017 (stat) ± 0.006 (sys). Using the value of χ d measured at the γ(4S) we derive the following limit for χ s : χ s > 0.16 (90% CL).
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