Abstract
The history of Weak Neutral Currents is briefly reviewed. Neutrino-electron scattering is treated in some detail: the data about three channels are now mutually consistent, and fix the weak neutral electron current to either pure axial vector A, or to vector current V. Parity violation in high energy ed scattering singles out the A-solution of the Salam-Weinberg type. A corresponding analysis of the space-time structure of the quark weak neutral currents reveals almost pure V — A. Assessing the isospin structure wants data from exclusive or semi-inclusive reactions, like elastic neutrino-proton scattering or single-pion production. The result is essentially unique, and leaves the standard Salam-Weinberg SU2 × U1 model, with a mixing parameter sin2θw=0.25±0.03 1 as the sole possibility to describe weak neutral currents.
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