CP-violating asymmetry in B decays to 3 pseudoscalar mesons

The measurement of CP asymmetries in charged B meson decays might provide t he first demonstration of CP violation outside the K system. Among the usua l three CP-odd phases alpha, beta and gamma, the phase gamma seems to be th e most difficult to explore experimentally. In this talk I would like to re port on a recent analysis of the CP asymmetry in the partial widths for the non-leptonic decays Bi+/- --> (M) over bar pi(+/-) (M = pi(+), K+, pi(0), eta), which results from the interference of the non-resonant decay amplitu de with the resonant amplitude for B+/- --> X-e0 pi(+/-) followed by the de cay chi(c0) --> M (M) over bar. The CP violating phase gamma can be extract ed from the measured asymmetry. We find that the partial width asymmetry fo r B+/- --> pi(+)pi(-)pi(+/-) is about 0.33 sin gamma, and about 0.45 sin ga mma for B+/- --> K(+)K(-)pi(+/-), while it is somewhat smaller for B+/- --> pi(0)pi(0)pi(+/-) and B+/- --> eta eta pi(+/-).