Z-Z' MIXING AND OBLIQUE CORRECTIONS IN AN SU(3) XU(1) MODEL

We address the effects of the new physics predicted by the SU(3)L X U(1)x model on the precision electroweak measurements. We consider both Z-Z' mixing and one-loop oblique corrections, using a combination of neutral gauge boson mixing parameters and the parameters S and T. At tree level, we obtain strong limits on the Z-Z' mixing angle, -0.0006 < theta < 0.0042 and find M(Z2); > 490 GeV (both at 90% C.L.). The radiative corrections lead to T > 0 if the new Higgs are heavy, which bounds the Higgs masses to be less than a few TeV. S can have either sign depending on the Higgs mass spectrum. Future experiments may soon place strong restrictions on this model, thus making it eminently testable.