Measurement of Γbb Γhad from hadronic decays of the Z

1993 
We report a measurement of R b = Γ bb −Γ had from Z → qq events at LEP. Z → bb events are identified using a multidimensional analysis based on a neural network approach. We obtain 60% sample purity with an efficiency of 35%. Our measured value of R b is 0.222 ± 0.003 ± 0.007
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