GAUGE NAMBU-JONA-LASINIO MODEL AS A LOW-ENERGY APPROXIMATION OF QCD

For the Nambu-Jona-Lasinio model in the regime of dynamical symmetry b reaking we formulate principles for selecting 4-fermion models as a lo w-energy approximation of QCD. On their basis, by means of an effectiv e potential, we consider the possibility of their intrinsic stabilizat ion at a finite cutoff momentum A. In the framework of the approach, w e investigate the influence of the gluon condensate on the parameters of the model and the effective Lagrangian in the low-energy region.