论文标题
从T2HKK提取最佳物理敏感性：最佳检测器体积的研究
Extracting the best physics sensitivity from T2HKK: A study on optimal detector volume
论文作者
论文摘要
T2HK是日本即将进行的长基线实验，该实验将在距离源距离为295 km的距离时，每个Cherenkov检测器储罐分别为187 kt。 T2HKK也在考虑的一个替代项目，其中一个水箱将以1100公里的距离移至韩国。 295公里处的通量将覆盖第一个振荡的最大值，而在1100 km处的通量将主要覆盖第二个振荡最大值。由于双基线的物理敏感性取决于统计的变化，系统不确定性的依赖性，第二振荡最大值和物质密度的影响，在295 km时的187 kt检测器体积和1100 km时的187 kt检测器体积可能不是T2HKK的最佳配置。因此，我们试图通过研究上述参数之间的相互作用来优化两个位置的检测器体积的比率。 For the analysis of neutrino mass hierarchy, octant of $θ_{23}$ and CP precision, we have considered two values of $δ_{\rm{CP}}$ as 270$^\circ$ and $0^\circ$ and for CP violation we have considered the value of $δ_{\rm CP}= 270^\circ$.这些值是由从实验T2K和NO $ν$ a获得的此参数的当前最佳拟合值的动机。有趣的是，如果我们发现，如果系统不确定性可以忽略不计，则T2HK设置，即，当两个探测器坦克置于295 km处时，就层次结构敏感性而言，在$δ_{\ rm cp} = 270^\ 270^\ cirp $ cpp uck pectivitivitivitivitivitive semitivitivitivitive semitivitivitivitive semitivitivitivitive semitivitivitivitive semitivitivitivitive和cp cp cp nife sementarty敏感性方面给出了最佳效果。 cp} = 0^\ circ $。对于系统错误的当前值，我们发现T2HK和T2HKK设置都没有为层次结构，CP违规和CP精确敏感性提供更好的结果。在1100 km时，最佳检测器体积的范围为255 kt至345 kt，在上述参数中可以更好地结果。
T2HK is an upcoming long-baseline experiment in Japan which will have two water Cherenkov detector tanks of 187 kt volume each at distance of 295 km from the source. An alternative project, T2HKK is also under consideration where one of the water tanks will be moved to Korea at a distance of 1100 km. The flux at 295 km will cover the first oscillation maximum and the flux at 1100 km will mainly cover the second oscillation maximum. As physics sensitivity at the dual baseline rely on variation in statistics, dependence of systematic uncertainty, effect of second oscillation maximum and matter density, 187 kt detector volume at 295 km and 187 kt detector volume at 1100 km may not be the optimal configuration of T2HKK. Therefore, we have tried to optimize the ratio of the detector volume at both the locations by studying the interplay between the above mentioned parameters. For the analysis of neutrino mass hierarchy, octant of $θ_{23}$ and CP precision, we have considered two values of $δ_{\rm{CP}}$ as 270$^\circ$ and $0^\circ$ and for CP violation we have considered the value of $δ_{\rm CP}= 270^\circ$. These values are motivated by the current best-fit values of this parameter as obtained from the experiments T2K and NO$ν$A. Interestingly we find that if the systematic uncertainty is negligible then the T2HK setup i.e., when both the detector tanks are placed at 295 km gives the best results in terms of hierarchy sensitivity at $δ_{\rm CP}= 270^\circ$, octant sensitivity, CP violation sensitivity and CP precision sensitivity at $δ_{\rm CP}= 0^\circ$. For current values of systematic errors, we find that neither T2HK, nor T2HKK setup is giving better results for hierarchy, CP violation and CP precision sensitivity. The optimal detector volume which is of the range between 255 kt to 345 kt at 1100 km gives better results in those above mentioned parameters.
