A Precise Isospin Analysis Of B -> (D)Over-Bar(()*D-)(()*K-) Decays

We present a precise isospin analysis of the B -> (D) over bar (()*D-)(()*K-) decays using new recent experimental measurements on these final states. The decays B -> (D) over bar (()*D-)(()*K-), originating from b -> c (c) over bars transitions, are linked by a rich set of isospin properties. The isospin relations that connect the decay modes are presented and a fit is performed to obtain the isospin amplitudes and phases. We discuss the results of the fit and present a new measurement of the ratio of branching fractions B(gamma(45) -> B+B-) and 8(gamma(4S) -> B-0(B) over bar (0)). We finally discuss the implications of our findings for the measurement of the unitarity matrix parameters sin(2 beta) and cos(2 beta) using these decays. (C) 2011 Elsevier B.V. All rights reserved.