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

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.
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Contributor : Claudine Bombar <>
Submitted on : Friday, October 7, 2011 - 3:47:01 PM
Last modification on : Friday, November 6, 2020 - 3:28:52 AM

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V. Poireau, M. Zito. A precise isospin analysis of B -> Dbar(*) D(*) K decays. Physics Letters B, Elsevier, 2011, 704, pp.559-565. ⟨10.1016/j.physletb.2011.09.097⟩. ⟨in2p3-00630195⟩



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