Search for the rare decay KL→π0νν¯ at J-PARC KOTO experiment
Search for the rare decay KL→π0νν¯ at J-PARC KOTO experiment
复制标题
在 J-PARC KOTO 实验中寻找罕见的衰变 KL→π0νν´
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. Shinohara
中科院分区：
文献类型：
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作者：
S. Shinohara
KOTO实验旨在研究J-PARC中违反cp的稀有衰变KL→π νν¯。报告了2016年、2017年和2018年的数据集分析。为了减少背景，提高信号接受度，安装了新的管状光子探测器和新的触发系统，并开发了新的分析技术。kl产量为7.1×1012。单事件敏感性估计为6.9×10−10，与2015年的数据集相比提高了2倍。背景事件数估计为0.05±0.02。在信号区观察到四个候选事件，他们的研究正在广泛地进行，以找出他们的来源。
The KOTO experiment aims to study the CP-violating rare decay KL→π0νν¯ at J-PARC. The analysis of the data set taken in 2016, 2017 and 2018 is reported. In order to reduce backgrounds and to improve the signal acceptance, a new barrel photon detector and a new trigger system were installed and new analysis techniques were developed. The K L yield was 7.1×1012. The single event sensitivity was estimated to be 6.9×10−10, which was improved by a factor of 2 compared to the data set taken in 2015. The number of background events was estimated to be 0.05 ± 0.02. Four candidate events were observed in the signal region, and their studies are on-going extensively to nd their sources.