对NOvA、T2K和T2HK实验发现潜力的综合研究
A comprehensive study of the discovery potential of NOvA, T2K and T2HK experiments
摘要：
随着最近对反应堆混合角$θ_{13}$的测量，除了CP破坏相$δ_{CP}$外，描述PMNS矩阵的中微子振荡参数的知识有了显著的提高。中微子振荡研究中的其他未知参数是质量等级和大气混合角的八分圆$θ_{23}$。建议进行许多专门的实验来确定这些参数，这些实验从现在起至少需要10年才能投入使用。因此，利用现有实验的结果来看看我们是否能得到这些问题的部分答案是非常关键的。在本文中，我们研究了正在进行的NO $ν$ A和T2K实验以及即将到来的T2HK实验在解决这些问题的发现潜力。特别是，我们评估的灵敏度NO $ν$ A，以确定中微子质量层次，八分体简并和获得CP违反阶段后，其预定的期限为3年的中微子模式和3年的反中微子模式运行。然后，我们扩展分析，以了解发现的潜力，如果实验将运行（5 $ν$ +5 $\barν$）年和（7 $ν$ +3 $\barν$）年。我们还展示了当我们将来自（3 $ν$ +3 $\barν$）年的无$ν$ A运行的数据与（3 $ν$ +2 $\barν$）年的T2 K和（3 $ν$ +7 $\barν$）年的T2 HK实验相结合时，灵敏度如何提高。CP破坏灵敏度对于T2K和NO $ν$ A实验是边际的，即使对于NO $ν$ A的十年数据采集也是如此。对于$δ_{CP}$空间的五分之二值的分数，T2 HK具有高于5 $σ$的显著性。我们还发现，对于T2 K、NO $ν$ A和T2 HK，$δ_{CP}$可以被确定为分别优于$35^\circ $、$21^\circ $和$9^\circ $的所有$δ_{CP}$值。
英文摘要：
With the recent measurement of reactor mixing angle $θ_{13}$ the knowledge of neutrino oscillation parameters that describe PMNS matrix has improved significantly except the CP violating phase $δ_{CP}$. The other unknown parameters in neutrino oscillation studies are mass hierarchy and the octant of the atmospheric mixing angle $θ_{23}$. Many dedicated experiments are proposed to determine these parameters which may take at least 10 years from now to become operational. It is therefore very crucial to use the results from the existing experiments to see whether we can get even partial answers to these questions. In this paper we study the discovery potential of the ongoing NO$ν$A and T2K experiments as well as the forthcoming T2HK experiment in addressing these questions. In particular, we evaluate the sensitivity of NO$ν$A to determine neutrino mass hierarchy, octant degeneracy and to obtain CP violation phase after running for its scheduled period of 3 years in neutrino mode and 3 years in anti-neutrino mode. We then extend the analysis to understand the discovery potential if the experiments will run for (5$ν$+5$\barν$) years and (7$ν$+3$\barν$) years. We also show how the sensitivity improves when we combine the data from (3$ν$+3$\barν$) years of NO$ν$A run with (3$ν$+2$\barν$) years of T2K and (3$ν$+7$\barν$) years of T2HK experiments. The CP violation sensitivity is marginal for T2K and NO$ν$A experiments even for ten years data taking of NO$ν$A. T2HK has a significance above 5$σ$ for a fraction of two-fifth values of the $δ_{CP}$ space. We also find that $δ_{CP}$ can be determined to be better than $35^\circ $, $21^\circ $ and $9^\circ $ for all values of $δ_{CP}$ for T2K, NO$ν$A and T2HK respectively.
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