Structural Vertices of Extended SU(3)-Chiral Lagrangians in the Large-N_c Approach

Abstract

The main goal of this paper is to elaborate the model-framework parametrization of effective coupling constants of the extended chiral lagrangian which is suitable for the description of the low-energy matrix elements of vector, axial-vector, scalar and pseudoscalar currents as well as of the matrix elements of the pseudoscalar gluon density. We establish the connection between the structural coupling constants of the phenomenological chiral lagrangian and the coefficients of effective lagrangians obtained in the QCD-bosonization models by means of the derivative expansion. The large-N_c relations for corresponding structural constants are elaborated. On this way we find the new set of OZI rules. In particular, one of them predicts the branching ratio of the decays $\psi' \rightarrow J/\psi + \pi$ or $\eta$.