IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data
IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data
复制标题
DOI：
10.1103/physrevd.104.022002
复制
发表时间：
2020-11
影响因子：
5
通讯作者：
R. Abbasi;M. Ackermann;J. Adams;J. Aguilar;M. Ahlers;M. Ahrens;C. Alispach;A. A. Alves-A.;
中科院分区：
文献类型：
--
作者：
R. Abbasi;M. Ackermann;J. Adams;J. Aguilar;M. Ahlers;M. Ahrens;C. Alispach;A. A. Alves-A.;
冰立方中微子天文台已经确定了天体物理起源的高能全天中微子通量的存在。这一发现是使用在探测器的基准区域内相互作用的事件进行的，该区域被一个活跃的否决权所包围，并且重建的能量超过60 TeV，通常被称为高能起始事件样本，或HESE。我们重新审视HESE样本的分析，增加了4.5年的数据，更新的冰川模型和改进的系统学处理。本文详细介绍了样品，报告了最新的天体物理中微子通量测量，并提出了天体物理中微子源搜索。我们给出了这些观测与文献中提出的特定各向同性通量模型以及通用幂律类场景的兼容性。假设$\nu_e：\nu_\mu：\nu_\tau=1：1：1$，中微子和反中微子的流量相等，我们发现天体物理中微子谱符合不间断的幂律，在68.3 $的置信区间内，较好的谱指数为${2.87}^{+0.20}_{-0.19}$。
The IceCube Neutrino Observatory has established the existence of a high-energy all-sky neutrino flux of astrophysical origin. This discovery was made using events interacting within a fiducial region of the detector surrounded by an active veto and with reconstructed energy above 60 TeV, commonly known as the high-energy starting event sample, or HESE. We revisit the analysis of the HESE sample with an additional 4.5 years of data, newer glacial ice models, and improved systematics treatment. This paper describes the sample in detail, reports on the latest astrophysical neutrino flux measurements, and presents a source search for astrophysical neutrinos. We give the compatibility of these observations with specific isotropic flux models proposed in the literature as well as generic power-law-like scenarios. Assuming $\nu_e:\nu_\mu:\nu_\tau=1:1:1$, and an equal flux of neutrinos and antineutrinos, we find that the astrophysical neutrino spectrum is compatible with an unbroken power law, with a preferred spectral index of ${2.87}^{+0.20}_{-0.19}$ for the $68.3\%$ confidence interval.