Global constraints on absolute neutrino masses and their ordering
Global constraints on absolute neutrino masses and their ordering
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DOI：
10.1103/physrevd.95.096014
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发表时间：
2017-03
影响因子：
5
通讯作者：
F. Capozzi;E. D. Valentino;E. Lisi;A. Marrone;A. Melchiorri;A. Palazzo
中科院分区：
文献类型：
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作者：
F. Capozzi;E. D. Valentino;E. Lisi;A. Marrone;A. Melchiorri;A. Palazzo
在标准的三中微子框架内，中微子的绝对质量和它们的顺序(正常、否或反转IO)目前尚不清楚。然而，来自振荡实验、无中微子双β($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$)衰变搜索和宇宙学调查的当前数据的组合，可以为亚EV质量范围内的这种未知提供有趣的约束，在某些情况下可以低至$O({10}^{\ensureath{-}1})\TEXT{}\TEXT{}\MATHORM{EV}$。我们通过进行全球数据分析讨论了目前对绝对中微子质量可观测的限制，其中包括来自振荡实验的最新结果，来自卡姆兰德-赞实验的$0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$衰变界限，以及来自普朗克测量和其他宇宙学数据集的典型组合的约束。总体而言，在主要由中微子振荡数据(特别是大气)，在某些情况下得到宇宙学数据证实的水平上，NO似乎在某种程度上对IO有利。通过${\ensureath{\chi}}^{2}$方法，通过在NO和IO中的单独最小值周围或在任何顺序中的绝对最小值附近扩展参数空间，可以获得详细的约束。文中还讨论了对即将到来的振荡和非振荡中微子实验的影响，包括$\ensureath{\beta}$衰变搜索。
Within the standard three-neutrino framework, the absolute neutrino masses and their ordering (either normal, NO, or inverted, IO) are currently unknown. However, the combination of current data coming from oscillation experiments, neutrinoless double beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay searches, and cosmological surveys, can provide interesting constraints for such unknowns in the sub-eV mass range, down to $O({10}^{\ensuremath{-}1})\text{ }\text{ }\mathrm{eV}$ in some cases. We discuss current limits on absolute neutrino mass observables by performing a global data analysis that includes the latest results from oscillation experiments, $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay bounds from the KamLAND-Zen experiment, and constraints from representative combinations of Planck measurements and other cosmological data sets. In general, NO appears to be somewhat favored with respect to IO at the level of $\ensuremath{\sim}2\ensuremath{\sigma}$, mainly by neutrino oscillation data (especially atmospheric), corroborated by cosmological data in some cases. Detailed constraints are obtained via the ${\ensuremath{\chi}}^{2}$ method, by expanding the parameter space either around separate minima in NO and IO or around the absolute minimum in any ordering. Implications for upcoming oscillation and nonoscillation neutrino experiments, including $\ensuremath{\beta}$-decay searches, are also discussed.