Determination of strong and weak phases from B → D(*)±D(*)-+

We study the possibilities to extract strong and weak phases from the decays modes Bd → D*+D- and D+D*- as well as Bs → Ds*+Ds- and Ds+Ds*- in a model-independent way. As for the decay modes Bd → D*+D*- and Bs → Ds*+Ds*-, we show that it is possible to determine the weak CP-violating phase β without doing the angular analysis. Decays of this type may provide a window to test naive factorization hypothesis in B transitions to two heavy charmed mesons. Finally we give a brief analysis of possible final-state rescattering effects in B → D*/D-bar* modes. (author)