EFFECTIVE CHIRAL THEORY OF LARGE N_C QCD OF MESONS

An effective chiral theory of pseudoscalars, vectors, and axial-vectors is presented. In this theory mesons are coupled to quarks. At quark level mesons have no kinetic terms which are generated by quark loops. The theory has both explicit chiral symmetry(in the limit, m_q → 0) and dynamical chiral symmetry breaking. Large N_C expansion is a natural result. Tree diagrams are at leading order and meson loops are at higher orders. In this theory octet pseudoscalars are Goldstone bosons. Masses and decay widths of the mesons agree with data. VMD, Wess-Zumino-Witten anomaly, and OZI rule are obtained. Besides three current quark masses there are other two parameters: a universal coupling constant and a cutoff. At low energy the theory goes back to ChPT. The phenomenology of the theory is successful.