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arXiv 1306.2309astro-ph.HEastro-ph.COhep-exhep-ph
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揭开IceCube中PeV级联的神秘面纱:少(能量)即是多(事件)

Demystifying the PeV Cascades in IceCube: Less (Energy) is More (Events)

Ranjan Laha, John F. Beacom, Basudeb Dasgupta, Shunsaku Horiuchi, Kohta Murase

摘要:

冰立方中微子天文台探测到两个能量接近1 PeV的级联事件。在不引用新物理学的情况下,我们分析了这些中微子的来源。我们表明,大气中的常规中微子和宇宙成因中微子(超高能宇宙射线传播中产生的中微子)是强烈不利的。对于大气瞬发中微子或天体物理物体中产生的中微子扩散背景,情况就不那么清楚了。我们发现,有紧张局势与观测数据,但细节取决于最不为人所知的方面的冰立方分析。很可能,瞬发中微子是不受欢迎的,而天体物理中微子是可信的。我们表明,最快的方法来揭示所观察到的PeV中微子的起源是寻找中微子级联在低于1 PeV的范围内,专门的分析与高灵敏度尚未出现,并在那里可以找到更多的事件。

英文摘要:

The IceCube neutrino observatory has detected two cascade events with energies near 1 PeV. Without invoking new physics, we analyze the source of these neutrinos. We show that atmospheric conventional neutrinos and cosmogenic neutrinos (those produced in the propagation of ultra-high- energy cosmic rays) are strongly disfavored. For atmospheric prompt neutrinos or a diffuse background of neutrinos produced in astrophysical objects, the situation is less clear. We show that there are tensions with observed data, but that the details depend on the least-known aspects of the IceCube analysis. Very likely, prompt neutrinos are disfavored and astrophysical neutrinos are plausible. We demonstrate that the fastest way to reveal the origin of the observed PeV neutrinos is to search for neutrino cascades in the range below 1 PeV, for which dedicated analyses with high sensitivity have yet to appear, and where many more events could be found.

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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