中微子质量有序化--利用T2HK和JUNO的协同作用规避挑战
Neutrino Mass Ordering -- Circumventing the Challenges using Synergy between T2HK and JUNO
摘要：
中微子物理学的一个主要问题是质量有序（MO）。我们讨论了两个正在建设的实验T2 HK和JUNO测量MO的前景。只要满足某些实验挑战，预计JUNO单独测量MO的显著性大于$3σ$。特别地，JUNO需要优于3 $\%$的能量分辨率用于MO测量。另一方面，T2 HK在测量MO方面具有相当差的前景，特别是对于CP违反参数$δ_{\rm CP}$的某些范围，这对T2 HK构成了主要缺点。在这封信中，我们表明JUNO和T2 HK之间的协同效应将带来双重优势。首先，两个实验之间的协同作用帮助我们确定MO在一个非常高的意义。在两个实验的基线设置下，对于所有$δ_{\rm CP}$值，我们具有大于$9σ$的MO测定。其次，协同作用也使我们能够放松对两个实验的约束。我们表明，JUNO，甚至可以执行非常好的5 $\%$的能量分辨率，而T2 HK的MO问题与“坏”值的$δ_{\rm CP}$消失。对于所有$δ_{\rm CP}$值和JUNO仅5 $\%$能量分辨率，组合分析的MO灵敏度预计大于$6σ$。
英文摘要：
One of the major open problems of neutrino physics is MO (mass ordering). We discuss the prospects of measuring MO with two under-construction experiments T2HK and JUNO. JUNO alone is expected to measure MO with greater than $3σ$ significance as long as certain experimental challenges are met. In particular, JUNO needs better than 3$\%$ energy resolution for MO measurement. On the other hand, T2HK has rather poor prospects at measuring the MO, especially for certain ranges of the CP violating parameter $δ_{\rm CP}$, posing a major drawback for T2HK. In this letter we show that the synergy between JUNO and T2HK will bring two-fold advantage. Firstly, the synergy between the two experiments helps us determine the MO at a very high significance. With the baseline set-up of the two experiments, we have a greater than $9σ$ determination of the MO for all values of $δ_{\rm CP}$. Secondly, the synergy also allows us to relax the constraints on the two experiments. We show that JUNO, could perform extremely well even for energy resolution of 5$\%$, while for T2HK the MO problem with "bad" values of $δ_{\rm CP}$ goes away. The MO sensitivity for the combined analysis is expected to be greater than $6σ$ for all values of $δ_{\rm CP}$ and with just 5$\%$ energy resolution for JUNO.
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