  A method is proposed for the determination of the unitarity angle alpha
through tree penguin interference. The modes needed would be of the form
B0/B0-bar -> rho0 M and B0/B0-bar -> omega M where M is spin-0 uu-bar/dd-bar
meson, for instance M=pi0, eta, eta',a0 or f0. An analogous method can also
determine gamma using M=KS 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+pi. The method as applied to
determining gamma is probably less promising.
