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The asymmetry in the scattering of longitudinally polarized electrons by nucleons is considered in the context of gauge theories of the weak and electromagnetic interactions. The predictions of a variety of gauge groups and assignments of fermion representations of present interest are given for deep-inelastic scattering, elastic scattering, and electroproduction. It is shown that a combination of the three experiments carried out to a few parts in 10^5 at Q^21 GeV^2/c^2 can distinguish between various SU (2) U (1) models and between various classes of models based on larger gauge groups.
Cahn et al. (Wed,) studied this question.