Determining the phases α and γ from time-dependent CP violation in B0 decays to ρ(ω) + pseudoscalar

A method is proposed for the determination of the unitarity angle α through tree penguin interference. The modes needed would be of the form B0/B̄ 0→ρ0M and B0/B̄ 0→ωM where M is spin-0 uū/dd̄ meson, for instance M=π0, η, η′, a0 or f0. An analogous method can also determine γ using M=KS or KL. The validity of the theoretical approximations used may be tested by over determining α with several modes. If two or more modes are used, the determination has a four-fold ambiguity but additional information from pure penguin decays or theoretical estimates may be used to reduce the ambiguity to α, α+π. The method as applied to determining γ is probably less promising.