Chiral perturbation theory and the 1/N_c-expansion

Abstract

We briefly review the effective theory that describes the low energy properties of QCD with three light quarks and a large number of colours, N_c, and then discuss the mechanisms that forbid the Kaplan-Manohar transformation in this framework.

Comments: 2 pages. Talk given at the Workshop "Chiral Dynamics 2000: Theory and Experiment", Newport News, VA, USA, July 17-22, 2000