标题： 重子数分析 B → D̄(*) D(*) K 衰变 显示英文标题

标题： Isospin analysis of B -> Dbar(*) D(*) K decays

摘要： 介子b -> c cbar s电流的特殊同位旋性质导致了B -> Dbar(*) D(*) K衰变的一组丰富的同位旋关系，这里进行了介绍。 在这一背景下分析了这些衰变的完整集合并（22个测量值）的高质量实验数据，测试了同位旋关系，并讨论了同位旋振幅的结果。 测量和预期的分支比之间的比较得出了一种新的分支比比值Br(Upsilon(4S) -> B+ B-)/Br(Upsilon(4S) -> B0 B0bar)\}=0.86 +- 0.13的测量结果。 最后，我们讨论了这些衰变对测量sin(2 beta)和cos(2 beta)的影响。 显示英文摘要

摘要： The peculiar isospin properties of the b -> c cbar s current lead to a rich set of isospin relations for the B -> Dbar(*) 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. The comparison between the measured and expected branching fractions yields a new measurement of the ratio of branching fractions Br(Upsilon(4S) -> B+ B-)/Br(Upsilon(4S) -> B0 B0bar)}=0.86 +- 0.13. We finally discuss the implications of our findings for the measurement of sin(2 beta) and cos(2 beta) using these decays.