标题： Belle中D^{+}和D_{s}^{+}衰变性质的研究 显示英文标题

标题： Study of D^{+} and D_{s}^{+} Decay Properties at Belle

摘要： 我们报告了首次观察到的双层Cabibbo抑制衰变，$D^{+}_{s} \to K^{+}K^{+}\pi^{-}$以及使用在KEKB非对称能量$e^{+}e^{-}$对撞机上用Belle探测器收集的$\textrm{605 fb}^{-1}$数据对双层Cabibbo抑制衰变$D^{+} \to K^{+}\pi^{+}\pi^{-}$的显著改进测量。相对于其Cabibbo有利的对应物的分支比为$\mathcal{B}(D^{+}_{s} \to K^{+}K^{+}\pi^{-})/\mathcal{B}(D^{+}_{s} \to K^{+}K^{-}\pi^{+}) = 0.229\pm0.028\pm0.012)%$和$\mathcal{B}(D^{+} \to K^{+}\pi^{+}\pi^{-})/\mathcal{B}(D^{+} \to K^{-}\pi^{+}\pi^{+}) = (0.569\pm0.018\pm0.014)%$，其中第一个不确定性是统计的，第二个是系统性的。 我们还报告了使用相同数据样本对$D^{+} \to K^{0}_{S}K^{+}$和$D^{+}_{s} \to K^{0}_{S}\pi^{+}$的改进测量结果。 相对于 Cabibbo 优势模式测得的分支比为$\mathcal{B}(D^{+} \to K^{0}_{S}K^{+})/\mathcal{B}(D^{+} \to K^{0}_{S}\pi^{+}) = (0.1899\pm0.0011\pm0.0018)$和$\mathcal{B}(D^{+}_{s} \to K^{0}_{S}\pi^{+})/\mathcal{B}(D^{+}_{s} \to K^{0}_{S}K^{+}) = (0.0803\pm0.0024\pm0.0012)$。 显示英文摘要

摘要： We report the first observation of the doubly Cabibbo-suppressed decay, $D^{+}_{s} \to K^{+}K^{+}\pi^{-}$ and the significantly improved measurement of the doubly Cabibbo-suppressed decay, $D^{+} \to K^{+}\pi^{+}\pi^{-}$ using $\textrm{605 fb}^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The branching ratio with respect to its Cabibbo-favored counterpart are $\mathcal{B}(D^{+}_{s} \to K^{+}K^{+}\pi^{-})/\mathcal{B}(D^{+}_{s} \to K^{+}K^{-}\pi^{+}) = 0.229\pm0.028\pm0.012)%$ and $\mathcal{B}(D^{+} \to K^{+}\pi^{+}\pi^{-})/\mathcal{B}(D^{+} \to K^{-}\pi^{+}\pi^{+}) = (0.569\pm0.018\pm0.014)%$, where the first uncertainties are statistical and the second is systematic. We also report the improved measurement of $D^{+} \to K^{0}_{S}K^{+}$ and $D^{+}_{s} \to K^{0}_{S}\pi^{+}$ branching ratios using the same amount of data samples. The measured branching ratios with respect to the Cabibbo-favored modes are $\mathcal{B}(D^{+} \to K^{0}_{S}K^{+})/\mathcal{B}(D^{+} \to K^{0}_{S}\pi^{+}) = (0.1899\pm0.0011\pm0.0018)$ and $\mathcal{B}(D^{+}_{s} \to K^{0}_{S}\pi^{+})/\mathcal{B}(D^{+}_{s} \to K^{0}_{S}K^{+}) = (0.0803\pm0.0024\pm0.0012)$.