arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.11237hep-phastro-ph.COhep-ex
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2020年全球对中微子振荡图像的重新评估

2020 Global reassessment of the neutrino oscillation picture

P. F. de Salas, D. V. Forero, S. Gariazzo, P. Martínez-Miravé, O. Mena, C. A. Ternes, M. Tórtola, J. W. F. Valle

摘要:

本文在最简单的三中微子框架下给出了一个更新的中微子振荡数据的整体拟合。在本研究中,我们包括最新的分析,从一些实验。关于大气和太阳能部门,我们分别对DeepCore和SNO数据进行了更新分析。我们还包括大亚湾和RENO反应堆实验收集的最新电子反中微子数据,以及长基线T2 K和NO $ν$ A测量。这些新的分析导致$θ_{13}$、$θ_{12}$、$Δm_{21}^2$和$|Δm_{31}^2|$的更准确测量。大气角$θ_{23}$的最佳拟合值位于第二个八分圆,但在$\sim2.4σ$仍允许第一个八分圆解。关于CP破坏测量,我们得到的$δ$的首选值是1.08 $π$(1.58 $π$)正常(倒置)中微子质量排序。整体分析更倾向于正常的中微子质量排序与2.5 $σ$。这一偏好比以往全球分析中发现的偏好要温和。新的结果应被视为强大的,由于我们的贝叶斯和频率论方法之间的协议。考虑到只有振荡数据,有一个弱/中等偏好正常中微子质量有序的$2.00σ$。虽然从最新的Gerda、CUORE和KamLAND-Zen结果中添加了无中微子双β衰变,但几乎没有改变这一图景,宇宙学测量在保守的方法中提高了对$2.68σ$的偏好。一个更积极的宇宙学观测数据集组合导致了类似的偏好,即$2.70σ$。这个宇宙学数据集提供了中微子总质量的$2σ$上限,对应于正常(反向)中微子质量排序的$\sumν<0.12$($0.15$)~eV。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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