Extracting weak phase information from B → V1V2 decays

We describe a new method for extracting weak, CP-violating phase information, with no hadronic uncertainties, from an angular analysis of B --> V1V2 decays, where V-1 and V-2 are vector mesons. The quantity sin(2)(2 beta + gamma) can be cleanly obtained from the study of decays such as B-d(0)(t) --> D*(+/-)rho(+/-), D*(+/-)a(1)(+/-), D(-)*K-0((-))*(0), etc. Similarly, one can use B-s(0)(t) --> D*K-+/-(s)*(+/-) to extract sin(2)gamma. There are no penguin contributions to these decays. It is possible that sin(2)(2 beta + gamma) will be the second function of CP phases, after sin2 beta, to be measured at B factories.