NOvA早期反中微子运行的必要性
The need for an early anti-neutrino run of NOvA
摘要：
最近在反应堆实验中测得的$\ty$的较大值对未来的中微子实验是一个非常好的消息。特别是，\nova实验，$ν$和$\anu$运行各3年，如果以下两种有利组合之一为真，则能够确定质量等级：$-180^\circ \leq \dcp \leq 0$的正常等级或$0\leq \dcp \leq 180^\circ$的倒置等级。在这份报告中，我们研究了\nova数据的前3年的层次结构。由于$\sin^2 2 \tz$被测量为非最大值，因此$\tz$可以在较低或较高的八分圆中。纯$ν$数据受$\ty$ -层次和八分层次退化的影响，这限制了此类数据的层次敏感性。$ν$和$\anu$数据的组合不受这些简并的影响，因此具有更好的层次区分能力。我们发现，3年的$ν$运行，层次结构的确定是可能的，只有两个的四个八分位数层次结构的组合。在$ν$和$\anu$模式下相同的1.5年运行为所有四种组合提供了良好的分层灵敏度。
英文摘要：
The moderately large value of $\ty$, measured recently by reactor experiments, is very welcome news for the future neutrino experiments. In particular, the \nova experiment, with 3 years each of $ν$ and $\anu$ runs, will be able to determine the mass hierarchy if one of the following two favourable combinations is true: normal hierarchy with $-180^\circ \leq \dcp \leq 0$ or inverted hierarchy with $0\leq \dcp \leq 180^\circ$. In this report, we study the hierarchy reach of the first 3 years of \nova data. Since $\sin^2 2 \tz$ is measured to be non-maximal, $\tz$ can be either in the lower or higher octant. Pure $ν$ data is affected by $\ty$-hierarchy and octant-hierarchy degeneracies, which limit the hierarchy sensitivity of such data. A combination of $ν$ and $\anu$ data is not subject to these degeneracies and hence has much better hierarchy discrimination capability. We find that, with a 3 year $ν$ run, hierarchy determination is possible for only two of the four octant-hierarchy combinations. Equal 1.5 year runs in $ν$ and $\anu$ modes give good hierarchy sensitivity for all the four combinations.
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