从NO $ν$ A、T2K和ICAL得到的轻子CP相的证据：时间进程
Evidence for leptonic CP phase from NO$ν$A, T2K and ICAL: A chronological progression
摘要：
我们研究了长基线（LBL）实验NO $ν$ A和T2 K与大气中微子实验ICAL@INO之间的协同作用，以获得轻子区CP破坏的第一个线索。我们还讨论了如何精确的轻子CP相位（$δ_{CP}$）可以通过这些实验测量。首先在振荡概率的水平上描述CP灵敏度，讨论其对参数-- $θ_{13}$、质量等级和$θ_{23}$的依赖性。特别是，我们讨论了如何精确的知识或缺乏这些参数可以影响LBL实验的CP灵敏度。我们遵循分阶段的方法，并分析了$δ_{CP}$的敏感性，可以在不同的时间点在未来15年内从这些LBL实验单独和/或与ICAL@INO。我们发现NO $ν$ A/T2 K的CP敏感性由于不同通道之间以及两个实验之间的协同作用而增强。另一方面，缺乏知识的层次和八分圆的CP敏感性较差的一些参数范围。将ICAL数据添加到T2 K和NO $ν$ A可以排除这些虚假的错误层级和/或错误八分体解，并且导致$δ_{CP}$值的范围的显著增加，对于该范围可以实现CP破坏的提示。事实上，在不利于NO $ν$ A/T2 K的参数区域，我们可以通过将ICAL数据加入这些参数区域中来获得CP破坏的第一个证据。类似地，可以测量$δ_{CP}$的精度也随着ICAL数据的包括而提高。
英文摘要：
We study the synergy between the long-baseline (LBL) experiments NO$ν$A and T2K and the atmospheric neutrino experiment ICAL@INO for obtaining the first hint of CP violation in the lepton sector. We also discuss how precisely the leptonic CP phase ($δ_{CP}$) can be measured by these experiments. The CP sensitivity is first described at the level of oscillation probabilities, discussing its dependence on the parameters -- $θ_{13}$, mass hierarchy and $θ_{23}$. In particular, we discuss how the precise knowledge or lack thereof of these parameters can affect the CP sensitivity of LBL experiments. We follow a staged approach and analyze the $δ_{CP}$ sensitivity that can be achieved at different points of time over the next 15 years from these LBL experiments alone and/or in conjunction with ICAL@INO. We find that the CP sensitivity of NO$ν$A/T2K is enhanced due to the synergies between the different channels and between the two experiments. On the other hand the lack of knowledge of hierarchy and octant makes the CP sensitivity poorer for some parameter ranges. Addition of ICAL data to T2K and NO$ν$A can exclude these spurious wrong-hierarchy and/or wrong-octant solutions and cause a significant increase in the range of $δ_{CP}$ values for which a hint of CP violation can be achieved. In fact in parameter regions unfavourable for NO$ν$A/T2K, we may get the first evidence of CP violation by adding the ICAL data to these. Similarly the precision with which $δ_{CP}$ can be measured also improves with inclusion of ICAL data.
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