Abstract
We examine several patterns of breaking for supersymmetric and nonsupersymmetric E/sub 6/ theories that lead to an extra U(1) symmetry which at low energies (< or approx. =1 TeV) can reveal itself by the existence of an extra Z boson. We examine the phenomenological implications of such theories, including the predictions for the proton lifetime, the electroweak mixing angle, and the couplings of all the fermions to the new Z boson. In addition, we examine the constraints on the mass and width of the second Z from the present neutral-current and CERN pp-bar collider data. This analysis is especially relevant in light of recent results from superstring theories.
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