Abstract
We derive constraints for the representation content of SU(2)xU(1) gauge theories, whose neutral weak interactions conserve all flavors. Among the results are the following: (a) For theories where all right-handed quarks are singlets under weak isospin, the existence of quarks with different values of T/sub L//sup 2/ and Y/sub L/ implies one or more conservation laws in addition to charge. (b) In models with quarks of charges 2/3 and -1/3 and no new conservation laws we find that there are only three possibilities: (i) a generalization of the standard model with left-handed doublets and right-handed singlets, (ii) its mirror image, and (iii) a pure vector model with all quarks in doublets on the right and on the left, with degenerate masses for quarks of the same charge.
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