New atmospheric and solar results from Super-Kamiokande
New atmospheric and solar results from Super-Kamiokande
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超级神冈探测器的新大气和太阳结果
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Moriyama
中科院分区：
文献类型：
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作者：
S. Moriyama
超级神冈（SK）实验积累了关于大气中微子和太阳中微子事件的数据，并在过去20年中对其测量进行了改进。利用大气中微子数据进行了三味振荡分析，以研究中微子的质量等级、轻子CP破坏项和其它振荡参数。SK + T2K外部数据更倾向于正常质量等级：Δχ2 = χ2NH − χ2IH = −5.2（当假设SK + T2K的最佳拟合参数时，预期为−3.1）。更新了对t中微子出现的分析，观察到4.6σ的显著性。对约84，000个太阳中微子的观测提供了对能谱和时间变化的精确测量，测试了地球和太阳物质的影响。这个数据比KamLAND用反应堆反中微子测量的Δm221值低2s以上，他们在太阳中微子振荡拟合中确定了这个参数。
The Super-Kamiokande (SK) experiment has accumulated data on atmospheric neutrino and solar neutrino events and has made improvements in their measurements over the last 20 years. A three-flavor oscillation analysis was conducted with the atmospheric neutrino data in order to study the mass hierarchy, the leptonic CP violation term, and other oscillation parameters. A stronger preference for the normal mass hierarchy was obtained with SK + T2K external data: Δχ2 = χ2NH − χ2IH = −5.2 (−3.1 was expected when assuming the best fit parameters of the SK + T2K). The analysis of the appearance of t neutrinos has been updated and a significance of 4.6σ was observed. The observation of ~84,000 solar neutrinos give precise measurements of the energy spectrum and time variation testing terrestrial and solar matter effects. This data favor a lower Δm221 value than that measured with reactor anti-neutrinos by KamLAND by more than 2s, and they determine this parameter in the solar neutrino oscillation fit.