论文标题
搜索稀有衰减$ b^{+} \ to d_ {s}^{（\ ast）+}η$，$ d_ {s}^{（\ ast）+} \ bar {k}^{0}
Search for rare decays $B^{+} \to D_{s}^{(\ast)+}η$, $D_{s}^{(\ast)+}\bar{K}^{0}$, $D^{+}η$, and $D^{+}K^{0}$
论文作者
论文摘要
我们介绍了稀有衰减模式的研究$ b^{+} \ to d_ {s}^{+} h^{0} $，$ b^{+} \ to d_ {s}^{\ ast+ast+}使用$（772 \ pm 10）\ times 10^{6} $ $ $ b \ b \ bar {b \ bar {b} $事件，使用$（4S）$ resonance产生的事件。数据是由在非对称能量KEKB对撞机上运行的Belle检测器收集的。我们没有观察到这些衰变的证据，因此我们在90 $ \％$的置信度上提供上限，以$ b^{+} \至d_ {s}^{s}^{+} h^{0} $，$ d_ {s}^{s} {s}^{s}^{\ ast+ast+} h^h^h^h^0} $ d_ n MOD} $ d_} $ d_^$ d^^^^0}除了罕见的衰变模式外，我们报告了对颜色抑制的衰减分支分支的改进，$ \ Mathcal {b}（\ bar {b}^{0} \ to d^{0}η） $ \ mathcal {b}（\ bar {b}^{0} \ to d^{0} \ bar {k}^{0}）$ =（5.6 $ \ pm $ 0.5 $ 0.5 $ \ pm $ 0.2）$ $ \ times $ 10^{ - 5} $。第一和第二不确定性分别是统计和系统的。
We present a study of rare decay modes $B^{+} \to D_{s}^{+}h^{0}$, $B^{+} \to D_{s}^{\ast+}h^{0}$, and $B^{+} \to D^{+}h^{0}$, where $h^{0}$ denotes the neutral mesons $η$ or $K^{0}$, using a data sample of $(772 \pm 10 ) \times 10^{6}$ $B\bar{B}$ events produced at the $Υ(4S)$ resonance. The data were collected by the Belle detector operating at the asymmetric-energy KEKB collider. We observe no evidence for these decays, so we provide upper limits at the 90$\%$ confidence level on the branching fractions of $B^{+} \to D_{s}^{+}h^{0}$, $D_{s}^{\ast+}h^{0}$, and $D^{+}h^{0}$ decay modes. Along with rare decay modes, we report improved measurements of the color-suppressed decay branching fractions $\mathcal{B}(\bar{B}^{0} \to D^{0}η)$ = (26.6 $\pm$ 1.2 $\pm$ 2.1) $\times$ $10^{-5}$ and $\mathcal{B}(\bar{B}^{0} \to D^{0}\bar{K}^{0})$ = (5.6 $\pm$ 0.5 $\pm$ 0.2) $\times$ $10^{-5}$. The first and second uncertainties are statistical and systematic, respectively.
