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We present a new mechanism for electroweak symmetry breaking (EWSB) based ona strong Yukawa dynamics. We consider an SU(2)_L x U(1)_Y gauge invariant modelendowed with the usual Standard model fermion multiplets and with two massivescalar doublets. We show that, unlike in the Standard model, EWSB is possibleeven with vanishing vacuum expectation values of the scalars. Such EWSB isachieved dynamically by means of the (presumably strong) Yukawa couplings andmanifests itself by the emergence of fermion and gauge boson masses and scalarmass-splittings, which are expressed in a closed form in terms of the fermionand scalar proper self-energies. The `would-be' Nambu--Goldstone bosons areshown to be composites of both the fermions and the scalars. We demonstratethat the simplest version of the model is compatible with basic experimentalconstraints.

Dynamical electroweak symmetry breaking due to strong Yukawa interactions