Weak interactions PETRA results

Abstract
Recent results on weak interactions from experiments at the PETRA e + e − storage ring are presented. They include the determination of the weak neutral couplings in the purely leptonic reactions e + e −→e + e −, e + e −→μ+μ− and e + e − →τ+τ− and in the production of heavy charm and bottom quarks e + e −→c c̄ and e + e −→b b̄. The weak charged current is tested in τ decays, where new data on semihadronic branching ratis and a new lifetime measurement is reported, and in semileptonic decays of charm and bottom quarks.

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