THE B_K KAON PARAMETER IN THE 1/N_C EXPANSION

We present work going on calculating the kaon B_K parameter in the 1/N_c expansion. The goal of this work is to analyze analytically in the presence of chiral corrections this phenomenologically very important parameter. We present the method used and preliminary results for the chiral limit value for which we get . We also give some analytical indications of why the large N_c prediction of may have small 1/N_c corrections in the real case.