Exploring CP violation with B-c decays - art. no. 057503

We point out that the pure "tree" decays B-c(+/-) --> Ds+/-D are particular ly well suited to extract the Cabibbo-Kobayashi-Maskawa angle gamma through amplitude relations. In contrast with conceptually similar strategics usin g B+/- --> K+/-D or B-d --> K*D-0 decays, the advantage of the B-c approach is that the corresponding triangles have three sides of comparable length and do not involve small amplitudes. Decays of the type B-c(+/-) --> D+/-D, the U-spin counterparts of B-c(+/-) --> Ds+/-D, can be added to the analys is, as well as channels, where the D-s(+/-) and D+/- mesons are replaced by higher resonances.