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arXiv 2102.07897hep-ex
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Belle的$B$和$B_s$衰变研究

Study of $B$ and $B_s$ Decays at Belle

N. K. Nisar

摘要:

我们报告的结果搜索$B_s\toη^{\prime}η$衰变,和搜索$B^0\to\textrm{invisible}$和$B^0\to\textrm{invisible}+γ$衰变。前一个结果是基于在$Υ(5S)$共振处记录的$121.4~\textrm{fb}^{-1}$的数据样本,而后一个结果是从在KEKB $e^+e^-$对撞机上用Belle探测器在$Υ(4S)$共振处收集的数据样本的$711~\textrm{fb}^{-1}$获得的。我们没有观察到显著的衰变信号,并将其分支分数的上限设定为$\mathcal{B}(B_s\toη^{\prime}η)<7.1\times 10^{-5}$、$\mathcal{B}(B^0\to\textrm{invisible})<7.8\times 10^{-5}$和$\mathcal{B}(B^0\to\textrm{invisible}+γ)<1.6\times 10^{-5}$的90%置信水平。

英文摘要:

We report results on the search for $B_s\toη^{\prime}η$ decay, and the searches for $B^0\to\textrm{invisible}$ and $B^0\to\textrm{invisible}+γ$ decays. The former result is based on a data sample of $121.4~\textrm{fb}^{-1}$ recorded at the $Υ(5S)$ resonance while the later results are obtained from a $711~\textrm{fb}^{-1}$ of data sample collected at $Υ(4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. We observe no significant signal for the decays and set upper limit on their branching fractions at 90\% confidence level of $\mathcal{B}(B_s\toη^{\prime}η)<7.1\times 10^{-5}$, $\mathcal{B}(B^0\to\textrm{invisible})<7.8\times 10^{-5}$ and $\mathcal{B}(B^0\to\textrm{invisible}+γ)<1.6\times 10^{-5}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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