Electroweak effects in e+e- annihilations

Data on e+e- annihilation into μ+μ-, tau+tau-, and qanti q were used to test electroweak theories up to an s approx. equal to 1200 GeV2. The following results were obtained: 1) The PETRA experiments clearly demonstrated a forward backward asymmetry in the angular distribution of μ pairs. The combined value is A = -(11.9 +- 1.5)% to be compared to -9.3% predicted by the standard model using sin2THETAsub(w) = 0.23. The PEP experiments agree with this result, although they are also compatible with pure QED due to their lower cms energy and larger errors. 2) The angular distributions of tau pairs are compatible with the standard model but also with pure QED due to larger errors. 3) The total cross sections, both for μ and tau pairs, agree with QED and the standard model, which for sin2THETAsub(w) = 0.23, still coincides with QED at present energy. 4) The weak coupling constants were determined, the average PETRA values are hsub(VV)/4 = -0.01 +- 0.03 and hsub(AA)/4 = 0.33 +- 0.04. This result picks out one of the two solutions obtained in upsilone scattering and ed scattering results. 5) The total cross section for the production of hadrons was analysed in the framework of the quark parton model, taking into account QCD corrections and weak contributions using the standard model. The data agree with the predictions using Λsub(QCD) = 0.3 (which corresponds to αsub(s) = 0.17 at cms energy of 34 GeV) and sin2THETAsub(w) = 0.23. (orig.)