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arXiv 1505.03355astro-ph.HEhep-exhep-ph
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高能IceCube中微子的味成分

The Flavour Composition of the High-Energy IceCube Neutrinos

Aaron C. Vincent, Sergio Palomares Ruiz, Olga Mena

摘要:

我们提出了一个深入的分析的味道和光谱组成的36个高能中微子事件观察后,三年的观测冰立方中微子望远镜。虽然已知的天体物理来源的HE中微子预计将产生近$(1:1:1)$味比(电子:μ子:τ)的中微子在地球上,我们发现,最好的拟合的基础上检测到的事件以上$E_ν\ge 28$ TeV不一定支持这一假设。至关重要的是,在分析HE中微子数据时考虑的能量范围可能对结论产生深远的影响。我们强调了两个有趣的谜题:一个是μ介子中微子的明显缺陷,通过类径迹事件的缺陷来观察;另一个是在高能时没有$\bar ν_e$,这被看作是在希豪共振附近没有事件。我们讨论了可能的解释,包括错误识别的轨道阵雨,和一个破碎的幂律,类比观察到的宇宙射线谱。

英文摘要:

We present an in-depth analysis of the flavour and spectral composition of the 36 high-energy neutrino events observed after three years of observation by the IceCube neutrino telescope. While known astrophysical sources of HE neutrinos are expected to produce a nearly $(1:1:1)$ flavour ratio (electron : muon : tau) of neutrinos at earth, we show that the best fits based on the events detected above $E_ν\ge 28$ TeV do not necessarily support this hypothesis. Crucially, the energy range that is considered when analysing the HE neutrino data can have a profound impact on the conclusions. We highlight two intriguing puzzles: an apparent deficit of muon neutrinos, seen via a deficit of track-like events; and an absence of $\bar ν_e$'s at high energy, seen as an absence of events near the Glashow resonance. We discuss possible explanations, including the misidentification of tracks as showers, and a broken power law, in analogy to the observed HE cosmic ray spectrum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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