出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：A new strategy to quantify the role of the charm quark mass in the ΔI = 1/2 rule is summarized.
Results for the low-energy couplings of the ΔS = 1 chiral effective Hamiltonian in a theory with
a light charm quark (GIM limit) are obtained through a matching of three-point correlation functions
computed in Chiral Perturbation Theory and in quenched lattice QCD. We observe a large
ΔI = 1/2 enhancement, which is not large enough to explain the experimental result, but suggests
significant long-distance contributions to the physical ΔI = 1/2 which are unrelated to penguin
contractions or operators.
