DIRECT CP VIOLATION IN K -]3-PI DECAY

In light of the fact that the presence of the Z0 penguin diagram suppresses strongly epsilon-2-pi-'/epsilon in K0 --> 2-pi decay for large values of m(t), we reanalyze the direct decay-amplitude CP violation in K0 --> 3-pi decays in the Kobayashi-Maskawa model. The effects due to electroweak penguins, isospin breaking, and higher-order weak chiral Lagrangians are studied in the large-N(c) approach. We find that the Li-Wolfenstein relation between epsilon-3-pi-' and epsilon-2-pi-' is modified dramatically: the former receives very large contributions from the higher-derivative chiral terms and sizable contributions from the isospin-breaking correction due to pi-0-eta-eta' mixing and eta, eta' --> 3-pi transitions. When the top quark becomes very heavy, effects of the electroweak penguin terms are enhanced. Unlike epsilon-2-pi-'/epsilon, which decreases as m(t) increases, the CP-violating parameter epsilon-3-pi-'/epsilon is of order 10(-2) and increases with the heavy top-quark mass.