We show how the standard SU(2) ×{} U(1) gauge model may be generalized to include several neutral intermediate vector bosons, without changing the predictions of the model for neutral-current neutrino interactions. The expanded gauge models involve at least one neutral intermediate vector boson which is lighter than the Z⁰(80 GeV) of the standard model.
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Georgi et al. (1978) studied this question.
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