Neutrino Physics

experimental measurements of neutral-current interactions allow a study of the neutral-current coupling of leptons and quarks in a model-independent way. The coupling constants can now be uniquely determined by the data. Progress is achieved in particular for the neutral electron current coupling owing to a measurement of the y- dependence of parity violation in the scattering of polarized electrons on deuterium. measurements of neutrino and antineutrino scattering on electrons have been performed which will ultimately give the most reliable determination of the electroweak mixing angle of the Weinberg-Salam model. They will allow a sensitive search for small deviations from that model, owing to the effects of additional Z/sup 0 / bosons, of triplet representations for Higgs bosons, or of mixing of the right-handed fermions into doublets. (58 refs).