论文标题
2020年全球中微子振荡图片的重新评估
2020 Global reassessment of the neutrino oscillation picture
论文作者
论文摘要
我们在最简单的三中性框架中提出了中微子振荡数据的全局拟合。在本研究中,我们包括许多实验的最新分析。关于大气和太阳能部门,我们分别对DeepCore和SNO数据进行了更新的分析。我们还包括了Daya Bay和Reno反应堆实验收集的最新电子抗肿瘤数据,以及长基线T2K和NO $ν$ A的测量结果。这些新分析导致更准确的测量值$θ_{13} $,$θ_{12} $,$Δm_{21}^2 $和$ |Δm_{31}}^2 | $。大气角度$θ_{23} $的最佳拟合值在于第二个八分之一,但第一个八分位解决方案仍然允许使用$ \sim2.4σ$。关于CP违反测量值,我们获得的$δ$的首选值为正常(倒)中微子质量订购的$δ$ 1.08 $π$(1.58 $π$)。全球分析更喜欢正常中微子质量排序,而2.5 $σ$。这种偏好比以前的全球分析中的偏好要温和。由于我们的贝叶斯和频繁主义方法之间的协议,新结果应被认为是强大的。仅考虑到振荡数据,对正常中微子质量排序$2.00σ$存在弱/中等偏好。在添加最新Gerda的中性betaβ衰减的同时,Cuore和Kamland-Zen的结果几乎没有修改这张图片,但宇宙学测量值将保守方法中的宇宙学测量结果提高到$2.68σ$。宇宙学观察的更具侵略性的数据集组合会导致类似的偏好,即$2.70σ$。相同的宇宙学数据集提供了$2σ$的上微子质量上微子质量的上午质量,对应于$ \sumν<0.12 $($ 0.15 $)〜ev,用于正常(倒数)中微子质量订购。
We present an updated global fit of neutrino oscillation data in the simplest three-neutrino framework. In the present study we include up-to-date analyses from a number of experiments. Concerning the atmospheric and solar sectors, we give updated analyses of DeepCore and SNO data, respectively. We have also included the latest electron antineutrino data collected by the Daya Bay and RENO reactor experiments, and the long-baseline T2K and NO$ν$A measurements. These new analyses result in more accurate measurements of $θ_{13}$, $θ_{12}$, $Δm_{21}^2$ and $|Δm_{31}^2|$. The best fit value for the atmospheric angle $θ_{23}$ lies in the second octant, but first octant solutions remain allowed at $\sim2.4σ$. Regarding CP violation measurements, the preferred value of $δ$ we obtain is 1.08$π$ (1.58$π$) for normal (inverted) neutrino mass ordering. The global analysis prefers normal neutrino mass ordering with 2.5$σ$. This preference is milder than the one found in previous global analyses. The new results should be regarded as robust due to the agreement found between our Bayesian and frequentist approaches. Taking into account only oscillation data, there is a weak/moderate preference for the normal neutrino mass ordering of $2.00σ$. While adding neutrinoless double beta decay from the latest Gerda, CUORE and KamLAND-Zen results barely modifies this picture, cosmological measurements raise the preference to $2.68σ$ within a conservative approach. A more aggressive data set combination of cosmological observations leads to a similar preference, namely $2.70σ$. This very same cosmological data set provides $2σ$ upper limits on the total neutrino mass corresponding to $\sumν<0.12$ ($0.15$)~eV for normal (inverted) neutrino mass ordering.