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arXiv 1909.05129astro-ph.HE
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大气μ介子中微子能谱高达2.5 PeV的模型无关测量

Model-independent Measurement of the Atmospheric Muon Neutrino Energy Spectrum up to 2.5 PeV

Tobias Hoinka, Jan Soedingrekso, Mathis Börner

摘要:

南极的冰立方天文台可以测量扩散的中微子通量。特定通量参数化的假设限制了光谱形状的范围。考虑到所记录的数据的统计数据越来越多,模型独立的展开方法可以克服这些限制。在这方面的贡献,一个独立的模型的方法来估计的μ子中微子通量之间的125 GeV和2.5 PeV。为了从探测器采集的数据中提取μ介子中微子,采用了基于机器学习的方法。这产生了一个有效的μ子中微子样品,纯度超过99%。频谱估计的可能性为基础的展开技术,涉及一种新的分仓方案,使用决策树三年的冰立方数据。这项测量提供了多年来在这种能量范围内的第一个与模型无关的μ子中微子谱。

英文摘要:

The IceCube Observatory at the South Pole allows the measurement of the diffuse neutrino flux. The assumption of specific flux parametrizations limits the range of spectral shapes. Given the increasing statistics of the data recorded, model-independent unfolding approaches can overcome these limitations. In this contribution, a model-independent approach to estimate the muon neutrino flux between 125 GeV and 2.5 PeV is presented. In order to extract muon neutrinos from the data taken by the detector, a machine-learning-based method is employed. This yields an efficient muon neutrino sample with a purity of over 99 %. The spectrum is estimated by a Likelihood-based unfolding technique involving a novel binning scheme using a decision tree on three years of IceCube data. This measurement provides the first model-independent muon neutrino spectrum for multiple years in this energy regime.

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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