Study of the K L → π 0 νν Decay at the J-PARC KOTO Experiment
Study of the K L → π 0 νν Decay at the J-PARC KOTO Experiment
复制标题
J-PARC KOTO 实验中 KL → π 0 νν 衰变的研究
DOI：
10.1103/physrevlett.126.121801
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发表时间：
2021
影响因子：
8.6
通讯作者：
K.Shiomi et al
中科院分区：
文献类型：
--
作者：
J. K. Ahn;H.Nanjo;K.Shiomi et al
使用 2016 年、2017 年和 2018 年 J-PARC KOTO 实验采集的数据集对罕见衰变进行了研究。在单事件灵敏度为 的情况下，在信号区域观察到了三个候选事件。揭开它们之后，对来自和分散腐烂的污染进行了研究，并估计了背景事件的总数。我们得出的结论是，观察到的事件数量在统计上与背景预期一致。对于此数据集，我们设置了 90% 置信水平的分支分数上限。
The rare decaywas studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of, three candidate events were observed in the signal region. After unveiling them, contaminations fromand scattereddecays were studied, and the total number of background events was estimated to be. We conclude that the number of observed events is statistically consistent with the background expectation. For this dataset, we set an upper limit ofon the branching fraction ofat the 90% confidence level.