Meson production processes in electron–positron collisions and tau-lepton decays within the extended Nambu – Jona-Lasinio model

The extended Nambu – Jona-Lasinio model is briefly described and various ways to apply it are demonstrated. Theoretical approaches to the low-energy meson production processes in colliding electron–positron beams and tau-lepton decays are reviewed. The processes considered occur via intermediate scalar, vector, and axial-vector mesons in the ground state and in the first radially excited state. The model uses the concept of spontaneous chiral symmetry breaking to describe such states. Experimental and theoretical comparisons with other phenomenological strong interaction models are presented.