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We investigate gauge-theory-model predictions for various aspects of single-pion production by the weak neutral current. The models investigated are representatives of SU(2) ×{} U(1), SU(2) ×{} SU(2) ×{} U(1), and SU(3) ×{} U(1) type gauge theories. Adler's model for single-pion production, including all $l=0$ and $l=1$ multipoles, is used. Corrections for scattering off nuclear targets are evaluated in a model by Adler, Nussinov, and Paschos. Comparison is made with the available data.
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Evelyn H. Monsay (1978) studied this question.
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