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Unfinished fabric of the three neutrino paradigm
Physical Review D ( IF 5 ) Pub Date : 2021-10-26 , DOI: 10.1103/physrevd.104.083031
Francesco Capozzi 1 , Eleonora Di Valentino 2 , Eligio Lisi 3 , Antonio Marrone 3, 4 , Alessandro Melchiorri 5, 6 , Antonio Palazzo 3, 4
Affiliation  

In the current 3ν paradigm, neutrino flavor oscillations probe three mixing angles (θ12,θ23,θ13), one CP-violating phase δ, and two independent differences between the squared masses mi2, that can be chosen as δm2=m22m12>0 and Δm2=m32(m12+m22)/2, where sign(Δm2)=+() for normal (inverted) mass ordering. Absolute ν masses can be probed by the effective mass mβ in beta decay, by the total mass Σ in cosmology and—if neutrinos are Majorana—by another effective mass mββ in neutrinoless double beta decay. Within an updated global analysis of oscillation and nonoscillation data, we constrain these 3ν parameters, both separately and in selected pairs, and highlight the concordance or discordance among different constraints. Five oscillation parameters (δm2,|Δm2|,θ12,θ23,θ13) are consistently measured, with an overall accuracy ranging from 1% for |Δm2| to 6% for sin2θ23 (due to its persisting octant ambiguity). We find overall hints for normal ordering (at 2.5σ), as well as for θ23<π/4 and for sinδ<0 (both at 90% C.L.), and discuss some tensions among different datasets. Concerning nonoscillation data, we include the recent KATRIN constraints on mβ, and we combine the latest Ge76, Te130 and Xe136 bounds on mββ, accounting for nuclear matrix element covariances. We also discuss some variants related to cosmic microwave background (CMB) anisotropy and lensing data, which may affect cosmological constraints on Σ and hints on sign(Δm2). The default option, including all Planck results, irrespective of the so-called lensing anomaly, sets upper bounds on Σ at the level of 101eV, and further favors normal ordering up to 3σ. An alternative option, that includes recent ACT results plus other independent results (from WMAP and selected Planck data) globally consistent with standard lensing, is insensitive to the ordering but prefers Σfew×101eV, with different implications for mβ and mββ searches. In general, the unfinished fabric of the 3ν paradigm appears to be at the junction of diverse searches in particle and nuclear physics, astrophysics and cosmology, whose convergence will be crucial to achieve a convincing completion.

中文翻译:

三中微子范式的未完成结构

在当前 3ν 范式,中微子风味振荡探测三个混合角度 (θ12,θ23,θ13), 一 C-违反阶段 δ,以及平方质量之间的两个独立差异 一世2,可以选择为 δ2=22-12>0Δ2=32-(12+22)/2, 在哪里 标志(Δ2)=+(-)对于正常(倒置)批量订购。绝对ν 质量可以通过有效质量来探测 β 在β衰变中,按总质量 Σ 在宇宙学中——如果中微子是马约拉纳——另一个有效质量 ββ在无中微子双β衰变中。在对振荡和非振荡数据的更新全局分析中,我们限制了这些3ν参数,单独的和选定的对,并突出显示不同约束之间的一致性或不一致。五个振荡参数(δ2,|Δ2|,θ12,θ23,θ13) 始终如一地测量,整体精度范围从 1% 为了 |Δ2|6% 为了 2θ23(由于其持续的八分圆歧义)。我们找到了正常排序的总体提示(在2.5σ),以及对于 θ23<π/4 并为 δ<0(均为 90% CL),并讨论不同数据集之间的一些紧张关系。关于非振荡数据,我们包括最近的 KATRIN 约束β,我们结合最新的 76, 130136 上界 ββ,考虑核矩阵元素协方差。我们还讨论了一些与宇宙微波背景 (CMB) 各向异性和透镜数据相关的变体,这些变体可能会影响Σ 和提示 标志(Δ2). 默认选项,包括所有普朗克结果,不考虑所谓的透镜异常,设置上限Σ 在级别 10-1电动汽车, 并进一步支持正常排序 3σ. 另一种选择,包括最近的 ACT 结果加上其他独立的结果(来自 WMAP 和选定的普朗克数据)与标准镜头全局一致,对排序不敏感,但更喜欢Σ很少×10-1电动汽车, 对 βββ搜索。一般来说,未完成的面料3ν 范式似乎处于粒子和核物理学、天体物理学和宇宙学的各种研究的结合点,它们的融合对于实现令人信服的完成至关重要。
更新日期:2021-10-26
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