A precise isospin analysis of B -> Dbar() D() K decays

Published 7 Jul 2011 in hep-ph and hep-ex | (1107.1438v2)

Abstract: We present a precise isospin analysis of the B -> Dbar() D() K decays using new recent experimental measurements on these final states. The decays B -> Dbar() D() K, originating from b -> c cbar s 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 BR(Upsilon(4S) -> B+ B-) and BR(Upsilon(4S) -> B0 B0bar). 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.