CP violation in Bd→D+ D-, D*+ D-, D+ D*-, and D*+D*- decays -: art. no. 014010

CP asymmetries in B-d-->D+D-, D*+D-, D+D*- and D*+D*- decays are investigated with the help of the factorization approximation and isospin relations. We find that direct CP violation is governed only by the short-distance penguin mechanism, while the indirect CP asymmetries in B-d-->D+/-D*-/+ transitions may be modified due to the final-state rescattering effect. An updated numerical analysis shows that the direct CP asymmetry in B-d(o) vs (B) over bar(d)(o)-->D+D- decays can be as large as 3%. The CP-even and CP-odd contributions to the indirect CP asymmetry in B-d(o) vs (B) over bar(d)(o)-->D*-D*- decays are found to have the rates 89% and 11% respectively. some comments on the possibilities to determine the weak phase beta and to test the factorization hypothesis are also given.