T2K、NOvA和JUNO中微子消失通道的质量顺序求和规则
A Mass Ordering Sum Rule for the Neutrino Disappearance Channels in T2K, NOvA and JUNO
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中文总结 AI 辅助
本文推导出一种中微子质量顺序求和规则，表明JUNO实验的大气$Δm^2$测量与T2K和NOvA结合，可在一年内以3 $σ$置信水平确定中微子质量顺序。
中文摘要 AI 辅助
我们重新审视了一种通过在电子中微子和缪子中微子消失通道中精确测量大气$Δm^2$来确定中微子质量顺序的方法，该方法由作者于2005年提出（hep-ph/0503283）。质量顺序是我们理解难以捉摸的中微子时一个非常重要且悬而未决的问题，确定质量顺序对其他中微子实验具有重要影响。JUNO反应堆实验将于今年开始采集数据，通过电子反中微子测量得到的大气$Δm^2$精度将在一年内从Daya Bay的2.4%提高三倍至0.8%。该测量结果与T2K和NOvA实验中缪子中微子消失的大气$Δm^2$测量结果相结合，将大幅增加两种剩余中微子质量顺序之间的$Δχ^2$。在本文中，我们推导出了一个质量顺序求和规则，可用于探讨JUNO的大气$Δm^2$测量与其他实验（特别是T2K和NOvA）结合后，能否在运行一年内以3 $σ$置信水平确定中微子质量顺序。若要在单一实验中达到5 $σ$置信水平，我们必须等到下一个十年的中期，届时DUNE实验将投入运行。
英文摘要
We revisit a method for determining the neutrino mass ordering by using precision measurements of the atmospheric $Δm^2$'s in both electron neutrino and muon neutrino disappearance channels, proposed by the authors in 2005 (hep-ph/0503283). The mass ordering is a very important outstanding question for our understanding of the elusive neutrino and determination of the mass ordering has consequences for other neutrino experiments. The JUNO reactor experiment will start data taking this year, and the precision of the atmospheric $Δm^2$'s from electron anti-neutrino measurements will improve by a factor of three from Daya Bay's 2.4 % to 0.8 % within a year. This measurement, when combined with the atmospheric $Δm^2$'s measurements from T2K and NOvA for muon neutrino disappearance, will contribute substantially to the $Δχ^2$ between the two remaining neutrino mass orderings. In this paper we derive a mass ordering sum rule that can be used to address the possibility that JUNO's atmospheric $Δm^2$'s measurement, when combined with other experiments in particular T2K and NOvA, can determine the neutrino mass ordering at the 3 $σ$ confidence level within one year of operation. For a confidence level of 5 $σ$ in a single experiment we will have to wait until the middle of the next decade when the DUNE experiment is operating.
