宇宙中微子漫射通量在10^16 eV至10^26 eV范围内的联合约束
Combined constraints on the diffuse flux of cosmic neutrinos between 10^16 eV and 10^26 eV
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- Institute for Nuclear Research, of the Russian Academy of Sciences（俄罗斯科学院核物理研究所）
- Physics Department, Lomonosov Moscow State University（莫斯科国立大学物理系）
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中文总结 AI 辅助
本文统一了不同实验对10^16-10^26 eV宇宙中微子漫射通量的约束，通过重建曝光量和泊松似然合并，给出了90%置信水平的准微分上限，并约束了宇宙成因及新物理中微子通量归一化。
中文摘要 AI 辅助
实验对PeV以上能段漫射中微子通量的约束已通过切伦科夫中微子望远镜、大气簇射阵列、极地冰层内及冰层上的射电探测器以及对月球的射电观测获得。已发表的结果采用不同的味、能段和统计约定，因此其通量上限无法直接合并。我们重建了已发表搜索的能量依赖曝光量，并将其置于10^16-10^26 eV范围内总全味ν+ν̄通量的统一约定中。已发表的事件计数和预期背景通过泊松似然合并，并利用单侧剖面似然构造，对十年跨度E_ν^-1测试谱获得了90%置信水平的准微分上限。将宇宙成因中微子和选定新物理场景的理论谱与合并后的能量依赖曝光量折叠，得到对其通量归一化的约束。这一均匀分析为跨越十个数量级的中微子能量提供了可复现的观测基准，并为当前和计划中的搜索提供了共同参考。
英文摘要
Experimental constraints on the diffuse neutrino flux above the PeV range have been obtained with Cherenkov neutrino telescopes, air-shower arrays, radio detectors in and above polar ice, and radio observations of the Moon. Published results use different flavor, energy-bin, and statistical conventions, so their flux limits cannot be combined directly. We reconstruct energy-dependent exposures of the published searches and place them in a common convention for the total all-flavor $ν+\barν$ flux over $10^{16}$-$10^{26}$ eV. Published event counts and expected backgrounds are combined with a Poisson likelihood, and 90% C.L. quasi-differential limits are obtained for one-decade $E_ν^{-1}$ test spectra using a one-sided profile-likelihood construction. Folding theoretical spectra of cosmogenic neutrinos and selected new-physics scenarios with the combined energy-dependent exposure yields constraints on their flux normalizations. This homogeneous analysis provides a reproducible observational benchmark across ten decades in neutrino energy and a common reference for current and projected searches.
