PUB - Publikationen an der Universität Bielefeld

If new strong interactions exist in the electroweak bosonic sector (e.g., strong Higgs sector, dynamical electroweak breaking, etc. ), it is natural to expect new resonances, with potentially strong couplings. We consider an additional vector-boson triplet, V+/-, V0, associated with an SU(2)V local symmetry under the specific (but rather natural) assumption that ordinary fermions are SU(2)v singlets. Mixing of the V triplet with the W+/- Z0 bosons effectively leads to an SU(2)L X U(1)Y violating vector-boson-fermion interaction which is strongly bounded by LEP1 data. In contrast, the potentially large deviation of the Z0W+W-coupling from its SU(2)L X U(1)Y value is hardly constrained by LEP1 data, Results from experiments with direct access to the trilinear Z0W+W- coupling (LEP200, NLC) are urgently needed.