冰立方中天体物理 tau 中微子候选事件的探测
高能物理 - 实验
2022-12-06 v3 高能天体物理现象
高能物理 - 唯象学
摘要
高能 tau 中微子在大气宇宙线簇射或宇宙粒子加速器中极少产生，但预期会在宇宙距离上的中微子传播过程中因味混合而出现。当高能 tau 中微子在冰立方探测器内部相互作用时，可分辨出两个空间分离的能量沉积：第一个来自带电流相互作用，第二个来自 tau 轻子衰变。我们报道了一项对冰立方 7.5 年数据的新分析，在该时段收集的 60 个“高能起始事件”（HESE）中识别出两个 tau 中微子候选者。HESE 样本具有高纯度、全天空灵敏度以及各中微子味的独特观测特征，从而实现味成分的新测量。测得的天体物理中微子味成分与预期一致，并以 2.8 显著性指示存在天体物理 tau 中微子通量。
引用
@article{arxiv.2011.03561,
title = {Detection of astrophysical tau neutrino candidates in IceCube},
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journal= {arXiv preprint arXiv:2011.03561},
year = {2022}
}
备注
This article is supported by a long-form paper that discusses the high-energy starting event selection titled: "The IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data."