A Consistent model of Electroweak data including Z →

We have performed an overall fit to the electroweak data with the generation blind U(1) extension of the Standard Model. As input data for fitting we have included the asymmetry parameters, the particle decay widths of Z, neutrino scattering, and atomic parity violation. The QCD coupling αs has been constrained to the world average obtained from all data except the Z width. On the basis of our fit we have constructed a viable gauge model that not only explains Rb and Rc but also provides a much better overall fit to the data than the Standard Model. Despite its phenomenological viability, our model is unfortunately not simple from the theoretical viewpoint. Atomic parity violation experiments strongly disfavor more aesthetically appealing alternatives that can be grand unified. This work was supported in part by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Division of High Energy Physics of the U.S. Department of Energy under Contract DE-AC03-76SF00098 and in part by the National Science Foundation under grant PHY-90-21139. email:[email protected]. email:[email protected] Supported by a Natural Sciences and Engineering Research Council of Canada Fellowship email:[email protected]