Astrophysical Tau Neutrino Identification with IceCube Waveforms
Astrophysical Tau Neutrino Identification with IceCube Waveforms
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DOI：
10.22323/1.358.1036
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
L. Wille;Donglian Xu
中科院分区：
文献类型：
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作者：
L. Wille;Donglian Xu
标准中微子振荡范式预测地球上天体物理中微子味道的比例几乎相等，无论它们在源头的产生比例如何。因此，天体物理tau中微子的识别不仅可以重新确认IceCube测量的天体物理中微子通量，而且对于精确确定地球上的天体物理中微子风味比至关重要，这是超越天文基线标准模型的物理学的重要探索。在 IceCube 中经历带电电流 (CC) 相互作用的 tau 中微子可能会产生双重能量沉积，第一个能量来自 CC 强子簇射，第二个来自随后的 tau 轻子衰变簇射。当能量高于约 100 TeV 时，这种连续的能量沉积可能可以在传感器波形中解析，因此可以是 IceCube 中单个 tau 中微子相互作用的特征。我们将展示使用改进的双脉冲波形识别技术并使用 8 年的数据在 IceCube 波形中搜索天体物理 tau 中微子的结果。
The standard neutrino oscillation paradigm predicts almost equal fractions of astrophysical neutrino flavors at Earth regardless of their production ratio at the sources. Therefore, identification of astrophysical tau neutrinos could not only reconfirm the astrophysical neutrino flux measured by IceCube, but also is essential in precisely determining the astrophysical neutrino flavor ratio at Earth, which is an important probe for physics beyond the Standard Model over astronomical baselines. A tau neutrino undergoing a charged current (CC) interaction in IceCube could produce a double deposition of energy, with the first one from the CC hadronic shower and the second from the subsequent tau lepton decay shower. Above an energy of ~100 TeV, such consecutive energy depositions might be resolvable in the sensor waveforms and hence can be a signature of an individual tau neutrino interaction in IceCube. We will present the results of a search for astrophysical tau neutrinos in IceCube waveforms with improved double pulse waveform identification techniques and using 8 years of data.