Stimulated by recent indications that neutral-current effects may have been seen in high-energy neutrino reactions, we take up several issues that bear on the characterization of neutral hadron currents. Occasional guidance is sought in gauge models of the weak interactions, but the discussion is essentially phenomenological. Special emphasis is given to the question whether the neutral currents have "new" pieces, unrelated to those which appear in electromagnetism and in weak charge-changing reactions. Of particular interest here is the question: Are the neutral vector currents conserved?
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Pais et al. (1974) studied this question.
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