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Facing the plethora of alternative hypotheses for the mecha nism of electroweak symmetry breaking (ESB) it is highly desirable to typify its phenomenology using the effective Lagrangians. The BESS (Breaking Electroweak Symmetry Strongly) model is one f them. The model couples the vector resonances universally to all Standard model (SM) fe rmion generations. We have modified the model by allowing direct interactions of the vector trip let with the third quark generation only. This is motivated by the extraordinary mass of the top quark w hich is close to the ESB scale. In addition, we have introduced new Lagrangian terms admitted by the model’s symmetries. Our modifications of the BESS model can significantly relax the lo w-energy limits on the original BESS model’s parameters. Further, due to the modifications t he new vector resonances became narrower. Here, we present the new model’s basic phenomenol ogy and compare it to the original BESS model.

A modified BESS model as an effective description of the strong electroweak symmetry breaking