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University of Illinois, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2007 Feb 9;98(6):061802. doi: 10.1103/PhysRevLett.98.061802. Epub 2007 Feb 6.
Using 355 pb;{-1} of data collected by the CDF II detector in pp[over ] collisions at sqrt[s]=1.96 TeV at the Fermilab Tevatron, we study the fully reconstructed hadronic decays B_{(s)};{0}-->D_{(s)};{-}pi;{+} and B_{(s)};{0}-->D_{(s)};{-}pi;{+}pi;{+}pi;{-}. We present the first measurement of the ratio of branching fractions B(B_{s};{0}-->D_{s};{-}pi;{+}pi;{+}pi;{-})/B(B;{0}-->D;{-}pi;{+}pi;{+}pi;{-})=1.05+/-0.10(stat)+/-0.22(syst). We also update our measurement of B(B_{s};{0}-->D_{s};{-}pi;{+})/B(B;{0}-->D;{-}pi;{+}) to 1.13+/-0.08(stat)+/-0.23(syst), improving the statistical uncertainty by more than a factor of 2. We find B(B_{s};{0}-->D_{s};{-}pi;{+})=[3.8+/-0.3(stat)+/-1.3(syst)]x10;{-3} and B(B_{s};{0}-->D_{s};{-}pi;{+}pi;{+}pi;{-})=[8.4+/-0.8(stat)+/-3.2(syst)]x10;{-3}.
利用费米实验室万亿电子伏特加速器在(\sqrt{s}=1.96)太电子伏特的质子-质子碰撞中CDF II探测器收集的355皮博(^{-1})的数据，我们研究了完全重建的强子衰变(B_{(s)}^0\to D_{(s)}^-\pi^+)和(B_{(s)}^0\to D_{(s)}^-\pi^+\pi^+\pi^-)。我们首次测量了分支比的比值(B(B_s^0\to D_s^-\pi^+\pi^+\pi^-)/B(B^0\to D^-\pi^+\pi^+\pi^-)=1.05\pm0.10)（统计）(\pm0.22)（系统）。我们还将(B(B_s^0\to D_s^-\pi^+)/B(B^0\to D^-\pi^+))的测量结果更新为(1.13\pm0.08)（统计）(\pm0.23)（系统），统计不确定性提高了两倍多。我们发现(B(B_s^0\to D_s^-\pi^+)=[3.8\pm0.3)（统计）(\pm1.3)（系统）(\times10^{-3})，(B(B_s^0\to D_s^-\pi^+\pi^+\pi^-)=[8.4\pm0.8)（统计）(\pm3.2)（系统）(\times10^{-3})。
