We review the relation between the ratio of hadronic and electronic Z widths, R = Γ(Z → qq)/Γ(Z → e+e-) and the strong coupling constant at the Z mass, αs. The theoretical uncertainty of αsderived from R is estimated to be Δαs= ±0.002 (electroweak) ± 0.002 (QCD)-0.003+0.004(mtop, mHiggs). © 1994.
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