Effective weak chiral Lagrangian to O(p(4)) in the chiral quark model

We investigate the Delta S = 1,2 effective weak chiral Lagrangian within th e framework of the chiral quark model. Starting from the effective four-qua rk operators, we derive the effective weak chiral action by integrating out the constituent quark fields. Employing the derivative expansion, we obtai n the effective weak chiral Lagrangian to order O(p(4)). We examine the con tributions of the order O(N-c) to the ratio g(8)/g(27), considering e.g. th e quark axial-vector constant g(A) different from unity. The low energy con stants of the counterterms are also presented and discussed. (C) 1999 Elsev ier Science B.V. All rights reserved.