Chiral Limit Prediction for epsilon'/epsilon at NLO in 1/N_c

Abstract

We report on a calculation of ${ϵ}_K^{\prime }/{ϵ}_K$ at next-to-leading in the $1/N_c$ expansion and to lowest order in Chiral Perturbation Theory. We discuss the short-distance matching, the scale and scheme dependence as well as the long-distance short-distance matching. We include the two known chiral corrections to our result and discuss further order $p^4$ corrections to it.

Comments: Invited talk given by J.P. at High Energy EuroConference QCD '00, 6-13th July (2000), 17 pages, 5 figures