We propose a new mechanism in which all of the electroweak symmetry breaking is driven by a natural top quark condensate, produced by “top-color” interactions at a multi-TeV scale. The scheme allows the observed top quark mass, and acceptable $T$ and $S$ parameters, by invoking a seesaw mechanism involving mixing of the top with an additional isosinglet quark.

• Received 10 December 1997

DOI:https://doi.org/10.1103/PhysRevLett.81.2634