Energy criterion to select the behavior of dynamical masses in   technicolor models
  We propose a quite general ansatz for the dynamical mass in technicolor models. We impose on this ansatz the condition for formation of the tightest composite boson state, or the criterion that it should lead to the deepest minimum of energy. This criterion indicates a particular form of the technifermion self energy. 
A. Doff, A. A. Natale