The peculiar isospin properties of the b --> c c(c) over bar s current lead to a rich set of isospin relations for the B --> (D) over bar ((*)) D-(*) K decays which are presented here. Recent high quality experimental data on the complete set of these decays (22 measurements) are analysed in this context, the isospin relations are tested and the results for the isospin amplitudes are discussed. Large values of the strong phases are suggested by the data. The comparison between the measured and expected branching fractions yields a new measurement of the ratio of branching fractions /Br(Y(4S) -->B-0(B) over bar (0) = 0.86 +/- 0.13. We finally discuss the implications of our findings for the measurement of sin(2) and cos(2l5) using these decays. (C) 2004 Elsevier B.V. All rights reserved.
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