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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2007 Feb 23;98(8):081801. doi: 10.1103/PhysRevLett.98.081801. Epub 2007 Feb 20.
We report the observation of decays B{0}-->D{s}{()+}pi- and B{0}-->D{s}{()-}K+ in a sample of 230 x 10(6) Upsilon(4S)-->BB[over] events recorded with the BABAR detector at the SLAC PEP-II asymmetric-energy e+ e- storage ring. We measure the branching fractions B(B{0}-->D{s}{+}pi-)=(1.3+/-0.3(stat)+/-0.2(syst))x10(-5), B(B{0}-->D{s}{-} K+)=(2.5+/-0.4(stat)+/-0.4(syst))x10(-5), B(B{0}-->D{s}{+}pi-)=(2.8+/-0.6(stat)+/-0.5(syst))x10(-5), and B(B{0}-->D{s}{-}K+)=(2.0+/-0.5(stat)+/-0.4(syst))x10(-5). The significances of the measurements to differ from zero are 5, 9, 6, and 5 standard deviations, respectively. This is the first observation of B{0}-->D{s}{+}pi-, B{0}-->D{s}{+}pi-, and B{0}-->D{s}{-}K+ decays.
我们报告了在SLAC PEP-II非对称能量正负电子存储环上使用BABAR探测器记录的230×10⁶个Υ(4S)→BB̅事件样本中，对B⁰→Dₛ⁺π⁻和B⁰→Dₛ⁻K⁺衰变的观测结果。我们测量了分支比：B(B⁰→Dₛ⁺π⁻) = (1.3±0.3(统计)±0.2(系统))×10⁻⁵，B(B⁰→Dₛ⁻K⁺) = (2.5±0.4(统计)±0.4(系统))×10⁻⁵，B(B⁰→Dₛ⁺*π⁻) = (2.8±0.6(统计)±0.5(系统))×10⁻⁵，以及B(B⁰→Dₛ⁻*K⁺) = (2.0±0.5(统计)±0.4(系统))×10⁻⁵。测量值与零不同的显著性分别为5、9、6和5个标准差。这是对B⁰→Dₛ⁺π⁻、B⁰→Dₛ⁺*π⁻和B⁰→Dₛ⁻*K⁺衰变的首次观测。
