Measurement of the atmospheric neutrino energy spectrum from 100 GeV to 400 TeV with IceCube
Measurement of the atmospheric neutrino energy spectrum from 100 GeV to 400 TeV with IceCube
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DOI：
10.1103/physrevd.83.012001
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发表时间：
2011-01-05
影响因子：
5
通讯作者：
Zarzhitsky, P.
中科院分区：
文献类型：
--
作者：
Abbasi, R.;Abdou, Y.;Zarzhitsky, P.
使用 IceCube 中约 18 000 个上行大气 μ 中微子事件的数据样本，对 100 GeV 至 400 TeV 的大气 μ 中微子能谱进行了测量。增强决策树用于事件选择，以拒绝错误重建的大气 μ 子并获得上行 μ 子中微子事件的样本。最终事件样本中的背景污染低于 1%。这是首次测量高达 400 TeV 的大气中微子，对于了解这种中微子背景对 IceCube 天体物理中微子观测的影响至关重要。测量的光谱与大气 nu(mu) + (nu) 超过 bar (mu) 通量的预测一致。
A measurement of the atmospheric muon neutrino energy spectrum from 100 GeV to 400 TeV was performed using a data sample of about 18 000 up-going atmospheric muon neutrino events in IceCube. Boosted decision trees were used for event selection to reject misreconstructed atmospheric muons and obtain a sample of up-going muon neutrino events. Background contamination in the final event sample is less than 1%. This is the first measurement of atmospheric neutrinos up to 400 TeV, and is fundamental to understanding the impact of this neutrino background on astrophysical neutrino observations with IceCube. The measured spectrum is consistent with predictions for the atmospheric nu(mu) + (nu) over bar (mu) flux.