Failure to detect parity-nonconserving effects in atomic transitions coupled with the available neutrino neutral-current data would appear to rule out all SU(2) {} U(1) gauge theories which respect "natural" conservation laws for charm and strangeness and quark-lepton symmetry. We analyze a left-right symmetric "natural" (in the above sense) and quark-lepton symmetric SU(2)LSU(2)RU(1) gauge theory and find that it accommodates all the features of neutral-current phenomena.
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Mohapatra et al. (1977) studied this question.
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