Differential limit on the extremely-high-energy cosmic neutrino flux in the presence of astrophysical background from nine years of IceCube data
Differential limit on the extremely-high-energy cosmic neutrino flux in the presence of astrophysical background from nine years of IceCube data
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来自九年 IceCube 数据的天体物理背景下极高能宇宙中微子通量的微分极限
DOI：
10.1103/physrevd.98.062003
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发表时间：
2018
影响因子：
5
通讯作者：
Aartsen M et al (IceCube Collaboration)
中科院分区：
文献类型：
--
作者：
Yoshida Masaki;Song Donguk;Ishikawa Ryoko;Kano Ryouhei;Suematsu Yoshinori;Narukage Noriyuki;Kubo Masahito;Shinoda Kazuya;Okamoto Takenori J.;McKenzie David E.;Rachmeler Laurel A.;Trujillo Bueno Javier;Auchere Fredric;Katsukawa Yukio;D. Chiba;Aartsen M et al (IceCube Collaboration)
本文基于对冰立方九年观测数据的分析，提出了一个关于极高能中微子通量的准微分上限。IceCube测量的天体物理中微子通量扩展到PeV能量，并且在寻找更高能量的独立信号通量时，它是背景通量，例如宇宙成因中微子信号。我们已经开发出一种新的方法，将强大的限制EHE中微子通量的存在下的天体物理背景下，其频谱尚未被理解的PeV能量的高精度。在新的两年样本中发现了一个沉积能量超过的独特事件，除了之前在七年EHE中微子搜索中发现的一个事件之外。这两个事件代表的中微子通量与宇宙成因中微子通量的预测不一致，并被认为是当前研究的天体物理背景。得到的极限是迄今为止最严格的能量范围之间。这一结果限制了中微子模型预测的三味中微子流量的at。假设质子占主导地位的超高能宇宙射线组成的EHE中微子生产方案的参数空间的一个重要部分是不赞成独立的不确定模型的河外背景光，以前的冰立方约束部分依赖。
We report a quasidifferential upper limit on the extremely-high-energy (EHE) neutrino flux abovebased on an analysis of nine years of IceCube data. The astrophysical neutrino flux measured by IceCube extends to PeV energies, and it is a background flux when searching for an independent signal flux at higher energies, such as the cosmogenic neutrino signal. We have developed a new method to place robust limits on the EHE neutrino flux in the presence of an astrophysical background, whose spectrum has yet to be understood with high precision at PeV energies. A distinct event with a deposited energy abovewas found in the new two-year sample, in addition to the one event previously found in the seven-year EHE neutrino search. These two events represent a neutrino flux that is incompatible with predictions for a cosmogenic neutrino flux and are considered to be an astrophysical background in the current study. The obtained limit is the most stringent to date in the energy range betweenand. This result constrains neutrino models predicting a three-flavor neutrino flux ofat. A significant part of the parameter space for EHE neutrino production scenarios assuming a proton-dominated composition of ultra-high-energy cosmic rays is disfavored independently of uncertain models of the extragalactic background light which previous IceCube constraints partially relied on.