Abstract
Combining neutral current (NC) data in a statistically correct way we determine: (i) the weak NC couplings in neutrino-nucleon and -electron scattering independently of gauge models; (ii) the weak isospin T 3 of the right-handed fermions u R, d R and e R , the Z mass, and sin 2 θ W in SU(2) ⊗ U(1) models with standard left-handed fermion multiplet assignment two Higgs doublets. Both determinations support the Weinberg-Salam model, although neither considerable right-handed fermion singlet-doublet mixing involving new heavy fermions can be excluded, nor the existence of a second Higgs doublet.
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