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School of Chemistry and Physics, University of Adelaide, Adelaide, SA 5005 Australia.
DESY, 15735 Zeuthen, Germany.
Eur Phys J C Part Fields. 2015;75(3):116. doi: 10.1140/epjc/s10052-015-3330-z. Epub 2015 Mar 11.
We present the development and application of a generic analysis scheme for the measurement of neutrino spectra with the IceCube detector. This scheme is based on regularized unfolding, preceded by an event selection which uses a Minimum Redundancy Maximum Relevance algorithm to select the relevant variables and a random forest for the classification of events. The analysis has been developed using IceCube data from the 59-string configuration of the detector. 27,771 neutrino candidates were detected in 346 days of livetime. A rejection of 99.9999 % of the atmospheric muon background is achieved. The energy spectrum of the atmospheric neutrino flux is obtained using the TRUEE unfolding program. The unfolded spectrum of atmospheric muon neutrinos covers an energy range from 100 GeV to 1 PeV. Compared to the previous measurement using the detector in the 40-string configuration, the analysis presented here, extends the upper end of the atmospheric neutrino spectrum by more than a factor of two, reaching an energy region that has not been previously accessed by spectral measurements.
我们介绍了一种用于利用冰立方探测器测量中微子能谱的通用分析方案的开发与应用。该方案基于正则化展开，在此之前进行事件选择，事件选择使用最小冗余最大相关算法来选择相关变量，并使用随机森林对事件进行分类。该分析是利用探测器59根弦配置的冰立方数据开展的。在346天的有效运行时间内检测到27771个中微子候选事例。实现了对99.9999%的大气μ子本底的剔除。利用TRUEE展开程序获得了大气中微子通量的能谱。大气μ子中微子的展开能谱覆盖从100 GeV到1 PeV的能量范围。与之前使用40根弦配置的探测器进行的测量相比，此处介绍的分析将大气中微子能谱的高端扩展了两倍多，达到了此前能谱测量未曾涉及的能量区域。
