论文标题
新的反应堆数据改善了中微子质量排序确定的鲁棒性
New reactor data improves robustness of neutrino mass ordering determination
论文作者
论文摘要
在中微子振荡物理学中，以LMA-Dark的名义存在许多确切的脱生酸。这些变性使得不可能在存在新的中微子相互作用的情况下仅通过振荡实验来确定$Δm^2_ {31} $的符号。包括多个振荡通道和中微子散射实验在内的不同测量的组合可以提高这些脱位的某些方面。实际上，先前对相干弹性中微子核散射（CEVN）的测量已经排除了比$ m_ {z'} \ sim50 $ meV重的新物理学的LMA-dark解决方案，而cesmological Incormations却不喜欢这些较打火机的siperators for $ m_ {z'} $ simv $ sim} $ 3 $ 3 $ 3 $ 3 $ sim。在这里，我们利用了德累斯顿II实验的新数据，该数据迄今为止具有反应堆中微子的CEVN上最强的界限。我们表明，这些数据完全消除了$ν_e$ sector中的归化，以降至MEV量表，此时早期宇宙的限制接管了这一点。虽然LMA-dark Deneracy在$ν_e$ sector中取消了，但仍可以在$ν_μ$和$ν_τ$ sector中恢复它，或者与非常具体的耦合进行上下夸克，我们推测在路径上。
In neutrino oscillation physics numerous exact degeneracies exist under the name LMA-Dark. These degeneracies make it impossible to determine the sign of $Δm^2_{31}$ known as the atmospheric mass ordering with oscillation experiments alone in the presence of new neutrino interactions. The combination of different measurements including multiple oscillation channels and neutrino scattering experiments lifts some aspects of these degeneracies. In fact, previous measurements of coherent elastic neutrino nucleus scattering (CEvNS) by COHERENT already ruled out the LMA-Dark solution for new physics with mediators heavier than $M_{Z'}\sim50$ MeV while cosmological considerations disfavor these scenarios for mediators lighter than $M_{Z'}\sim3$ MeV. Here we leverage new data from the Dresden-II experiment which provides the strongest bounds on CEvNS with reactor neutrinos to date. We show that this data completely removes the degeneracies in the $ν_e$ sector for mediators down to the MeV scale at which point constraints from the early universe take over. While the LMA-Dark degeneracy is lifted in the $ν_e$ sector, it can still be restored in the $ν_μ$ and $ν_τ$ sector or with very specific couplings to up and down quarks, and we speculate on a path forward.
