Direct CP Violation in B→Kπ Decays : A Puzzle Brought by "Penguin" Decays(Current Topics)

Abstract

In the two-body decay of the B meson to the K meson and the π meson, direct CP violation arises from interference of two decay amplitudes. While this phenomena is a characteristic phenomena predicted by the Kobayashi-Maskawa model, as larger data sample have been collected at the B factory experiments, the difference of the CP asymmetry between the neutral and charged B mesons become more evident. The difference cannot be explained theoretically, known as "Kπ" puzzle. While no clear conclusion can be drawn, it may indicate a new physics beyond the standard model.