利用超级神冈探测器(Super-Kamiokande)的全部纯水数据集搜索质子衰变为单个带电反轻子与无质量不可见粒子的过程
Search for proton decay into a single charged antilepton and a massless invisible particle using the full pure water data set of Super-Kamiokande
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中文总结 AI 辅助
本研究利用超级神冈探测器纯水阶段全部数据,搜索质子衰变为带电轻子与无质量不可见粒子的过程,未发现衰变迹象,将对应两种衰变模式的质子寿命下限分别提升2倍和1.5倍。
中文摘要 AI 辅助
本研究利用超级神冈探测器(Super-Kamiokande)整个纯水阶段的全部数据,对应401千吨·年的曝光量,开展质子衰变至p→l⁺+X的搜索,其中l⁺为带正电的轻子,X为不可见、无质量的中性粒子。在超出预期的大气中微子本底外,未观测到质子衰变的显著迹象。在90%置信水平下,质子部分寿命的下限被设定为:p→e⁺+X时为1.72×10³³年,p→μ⁺+X时为0.61×10³³年,这些结果分别将此前的下限提升了2倍和1.5倍。
英文摘要
A search for proton decay via $p\rightarrow l^{+}+X$, where $l^{+}$ is a positively charged lepton and $X$ is an invisible, massless, neutral particle, was performed using a 401~kton$\cdot$years exposure representing the entire pure water phase of Super-Kamiokande. No significant indication of a proton decay was observed beyond the expected atmospheric neutrino background. Lower limits on the partial lifetime of the proton were set to at $1.72\times10^{33}$ years for $p\rightarrow e^{+}+X$ and $0.61\times10^{33}$ years for $p\rightarrow μ^{+}+X$ at the $90\%$ confidence level. These results improve on previous limits by factors of 2 and 1.5, respectively.
发表机构
- Keio University(庆应义塾大学)
- Institute of Science Tokyo(东京科学大学)
- University of Tokyo(东京大学)
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