论文标题
审查T2K与No $ν$ A外观数据之间的张力，并暗示了新物理学
A review of the tension between the T2K and NO$ν$A appearance data and hints to new physics
论文作者
论文摘要
在本文中，我们回顾了长基线加速器中微子实验T2K和NO $ν$ a之间的张力状态。张力主要是由于两个实验的外观数据不匹配。我们解释了这种张力是如何基于$ν_μ\到ν_e$和$ \barν_μ\ to \barν_e$振荡概率的。我们定义真空振荡的参考点，最大$θ_{23} $和$δ_{cp} = 0 $，并计算每个实验的$ν_e/\barν_e$外观事件。然后，我们研究了从参考点偏离未知参数的效果，以及未知参数的任何给定值与来自T2K和NO $ν$ a的数据的兼容性。与参考点的预期$ν_e$事件相比，T2K观察到$ν_e$外观事件样本的大量过剩，而\ nova观察到了中等的过量。 t2k中的大量超过的规定，$δ_{cp} $以$ -90^\ circ $为基础，而$θ_{23}>π/4 $，偏爱正常的层次结构。 $ν$ a的中等多余量导致两个退化解决方案：a）nh，$ 0 <δ_{cp} <180^\ circ $，$θ_{23}>π/4 $; b）ih，$ -180^\ circ<δ_{cp} <0 $，$θ_{23}>π/4 $。这是两个实验之间张力的主要原因。我们已经审查了三个超出标准模型（BSM）物理场景的状态，（a）非自动混合，（b）洛伦兹违规违规和（c）非标准中微子相互作用，以解决紧张。
In this article, we review the status of the tension between the long-baseline accelerator neutrino experiments T2K and NO$ν$A. The tension arises mostly due to the mismatch in the appearance data of the two experiments. We explain how this tension arises based on $ν_μ\to ν_e$ and $\barν_μ\to \barν_e$ oscillation probabilities. We define the reference point of vacuum oscillation, maximal $θ_{23}$ and $δ_{CP}=0$ and compute the $ν_e/\barν_e$ appearance events for each experiment. We then study the effects of deviating the unknown parameters from the reference point and the compatibility of any given set of values of unknown parameters with the data from T2K and NO$ν$A. T2K observes a large excess in the $ν_e$ appearance event sample compared to the expected $ν_e$ events at the reference point, whereas \nova observes a moderate excess. The large excess in T2K dictates that $δ_{CP}$ be anchored at $-90^\circ$ and that $θ_{23}>π/4$ with a preference for normal hierarchy. The moderate excess at NO$ν$A leads to two degenerate solutions: A) NH, $0<δ_{CP}<180^\circ$, and $θ_{23}>π/4$; B) IH, $-180^\circ<δ_{CP}<0$, and $θ_{23}>π/4$. This is the main cause of the tension between the two experiments. We have reviewed the status of three beyond standard model (BSM) physics scenarios, (a) non-unitary mixing, (b) Lorentz invariance violation and (c) non-standard neutrino interactions, to resolve the tension.
