PUB - Publikationen an der Universität Bielefeld

We examine an extended electroweak theory based on SU(2)L x SU(2)V x U(l)Y and constrained by rho = 1 at tree level. Various models previously considered in the literature appear as special cases of our framework. The non-decoupling of the additional neutral vector boson V0 for m(V) --> infinity is traced back to the extra point-like photon interaction of leptons and quarks contained in the Hung-Sakurai electroweak model based on gamma-W3 mixing. A comparison of the predictions of the present model with precision electroweak data (M(Z0), M(W +/-), sBAR(W)2) will allow one to quantify how firmly SU(2)L x U(1)Y symmetry of vector-boson-fermion interactions is established by these data.