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

A method is proposed for the determination of the unitarity angle a through tree penguin interference. The modes needed would be of the form B-0/(B) over bar (0) --> rho M-0 and B-0/(B) over bar (0) --> omegaM where M is spin-0 u (u) over bar /d (d) over bar meson, for instance M = pi (0), eta, eta', a(0) or f(0). An analogous method can also determine gamma using M = K-S or K-L. The validity of the theoretical approximations used may be tested by over determining alpha 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 alpha, alpha + 7 pi. The method as applied to determining gamma is probably less promising. (C) 2001 Elsevier Science B.V. All rights reserved.