CP-violating asymmetry in B decays to 3 pseudoscalar mesons

Abstract

The measurement of CP asymmetries is charged B meson decays might provide the first demonstration of CP violation outside the K system. Among the usual three CP-odd phases α, β and γ, the phase γ seems to be the most difficult to explore experimentally. In this talk I would like to report on a recent analysis of the CP asymmetry in the partial widths for the non-leptonic decays B ± → M Mπ ± (M = π +, K +, π 0, η) , which results from the interference of the non-resonant decay amplitude with the resonant amplitude for B ± → χ c0 π ± followed by the decay χ c0 → M M . The CP violating phase γ can be extracted from the measured asymmetry. We find that the partial width asymmetry for B ± → π + π − π ± is about 0.33 sin γ, and about 0.45 sin γ for B ± → K + K − π ±, while it is somewhat smaller for B ± → π 0 π 0 π ± and B ± → ηηπ ±.