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arXiv 1302.0127astro-ph.HE
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用IceCube研究瞬发大气中微子

A view of prompt atmospheric neutrinos with IceCube

Anne Schukraft

摘要:

大气中微子是在大气簇射中产生的,当宇宙射线初级撞击地球大气层并发生强子相互作用时。传统的中微子流是由带电π介子和K介子衰变产生的,它在中微子望远镜测量的GeV到TeV范围内的中微子数据中占主导地位。瞬发大气中微子是由通常含有粲夸克的较重介子衰变产生的。它们的产生受到强烈抑制,但预计它们将表现出更硬的能谱。因此,它们可以在能量超过~ 100 TeV的大气中微子通量中占主导地位。目前还没有观测到这种瞬发大气通量成分。因此,这是一个有趣的信号,在一个弥漫的中微子搜索,但也在一个弥漫的天体物理中微子通量搜索的背景。扩散中微子搜索与冰立方中微子天文台的灵敏度已达到理论预期的水平,提示中微子通量,并提出了最近的结果。

英文摘要:

Atmospheric neutrinos are produced in air showers, when cosmic ray primaries hit the Earth's atmosphere and interact hadronically. The conventional neutrino flux, which dominates the neutrino data measured in the GeV to TeV range by neutrino telescopes, is produced by the decay of charged pions and kaons. Prompt atmospheric neutrinos are produced by the decay of heavier mesons typically containing a charm quark. Their production is strongly suppressed, but they are expected to exhibit a harder energy spectrum. Hence, they could dominate the atmospheric neutrino flux at energies above ~ 100 TeV. Such a prompt atmospheric flux component has not yet been observed. Therefore, it is an interesting signal in a diffuse neutrino search, but also a background in the search for a diffuse astrophysical neutrino flux. The sensitivity of diffuse neutrino searches with the IceCube Neutrino observatory has reached the level of theoretical expectations of prompt neutrino fluxes, and recent results are presented.

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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