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arXiv 2009.01253hep-phastro-ph.HE
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主动-无菌混合的天体物理中微子的味道

Flavors of Astrophysical Neutrinos with Active-Sterile Mixing

Markus Ahlers, Mauricio Bustamante, Niels Gustav Nortvig Willesen

摘要:

我们重新审视中微子望远镜观测到的高能天体物理中微子的味道组成。假设中微子味态的酉时间演化,在地球上可观察到的味成分通过振荡平均味跃迁与其来源的初始成分有关。在以前的研究中,我们推导出的TeV-PeV的天体物理中微子的味道成分假设三味幺正混合的一般界限。我们将这些界限扩展到活性-无菌中微子混合的情况。我们的界限是分析,仅基于混合的酉性导出,并且不需要对未知的活性无菌混合参数的值进行采样。这些界限适用于任何扩展的活性-无菌中微子混合的情况下,能量依赖的非标准风味混合占主导地位的标准混合中观察到的加速器,反应堆,和大气中微子振荡。

英文摘要:

We revisit the flavor composition of high-energy astrophysical neutrinos observed at neutrino telescopes. Assuming unitary time evolution of the neutrino flavor states, the flavor composition observable at Earth is related to the initial composition at their sources via oscillation-averaged flavor transitions. In a previous study we derived general bounds on the flavor composition of TeV-PeV astrophysical neutrinos assuming three-flavor unitary mixing. We extend these bounds to the case of active-sterile neutrino mixing. Our bounds are analytical, derived based only on the unitarity of the mixing, and do not require sampling over the values of the unknown active-sterile mixing parameters. These bounds apply to any extended active-sterile neutrino mixing scenario where energy-dependent nonstandard flavor mixing dominates over the standard mixing observed in accelerator, reactor, and atmospheric neutrino oscillations.

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