We present an electroweak theory in which left-handed quarks and leptons transform as doublets under separate SU(2) gauge groups. Spontaneous symmetry breakdown results in two charged and two neutral massive vector bosons. The lightest charged and neutral gauge bosons behave like the W and Z of the standard SU(2)×{}U(1) electroweak model. The heavier W and Z, which can be as light as several hundred GeV, couple primarily to quarks. Our theory predicts small deviations in the properties of the Z which will be visible at the SLAC Linear Collider and the CERN collider LEP.
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Georgi et al. (1989) studied this question.
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