CHIRAL PERTURBATION-THEORY, LARGE-N-C AND THE ETA' MASS

Using chiral perturbation theory and the large-N-c expansion, we obtai n expressions for the eta(1) mass and eta - eta(1) mixing in terms of low-energy chiral Lagrangian parameters. This is accomplished through an intermediate step of ''matching'' the topological susceptibility in the large-N-c and chiral Lagrangian descriptions. By inserting the va lues of well-measured parameters we obtain predictions involving the t he second order parameters L(6), L(7) and L(8). The prediction for L(6 ) is quite restrictive even after allowing for 1/N-c corrections.