  SU(2)xU(1) electroweak gauge model without Higgs sector is extended by a new
vector field C interacting with leptons and quarks of both chiralities. This
interaction is treated under a dynamical assumption in a self-consistent
approximation. Fermion masses are calculated in terms of new Abelian
hypercharges, and the intermediate boson masses are calculated in terms of the
fermion masses by sum rules. Self-consistency requires a rich sector of heavy
spin-1 collective fermion-antifermion excitations.
