On the Dynamical Symmetry Breaking of the Electroweak Interactions by the Top Quark

We discuss the electroweak gauge symmetry breaking triggered by a new strong attractive interaction to condensate fermion-antifermion, and topcolor is a prototype. To deal with the fermion pairing, a general method based on the Hubbard-Stratonovich transformation in the functional integral approach is used. We derive a formula which relates the $W^\pm$, $Z^0$ weak boson masses to that of the condensated fermion, thus generalizing the Pagels-Stokar formula obtained in QCD. The custodial SU(2) electroweak symmetry turns out to be systematically violated, the deviation of $ρ\equiv M_W^2/(M_Z^2\cos^2θ_W)$ from unity is related to the new physics scale $Λ$. Some phenomenological consequences of the top-pair condensation models are discussed. Distinctive signatures of the $\bar{t}t$ scalar bound state, a Higgs boson like denoted by $H_t$, are the dominant decay modes $H_t\to Υ+γ,$ $H_t\to Υ+Z^0$, and $H_t \to B^* +\bar{B}^*$.

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