Abstract
The different techniques used to access sin 2 θ eff lep in the hadronic sector is presented with a summary of the results obtained by the LEP experiments. The LEPI average in this sector is sin 2 θ eff lep = 0.23225 ± 0.00035. The main sources of uncertainties in the experimental measurements are reviewed with a special attention to the forward backward b asymmetry.
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