论文标题

中微子质量和质量排序:没有正常排序的确定性证据

Neutrino mass and mass ordering: No conclusive evidence for normal ordering

论文作者

Gariazzo, Stefano, Gerbino, Martina, Brinckmann, Thejs, Lattanzi, Massimiliano, Mena, Olga, Schwetz, Thomas, Choudhury, Shouvik Roy, Freese, Katherine, Hannestad, Steen, Ternes, Christoph A., Tórtola, Mariam

论文摘要

中微子质量排序的提取是粒子物理和宇宙学中的主要挑战之一,不仅是因为它对自然界中质量产生的基本理论的影响,而且还因为其在未来的中子中性中性β衰减实验搜索的规模中的决定性作用。最近据称,描述中微子质量参数空间的不同观察值的当前振荡,β衰减和宇宙学限制提供了强大的决定性贝叶斯证据,有利于中微子质谱的正常排序[arxiv:arxiv:2203.14247]。我们使用丰富而广泛的现象学进一步研究了这些强有力的主张,并具有不同的中微子参数空间的采样技术。与Jimenez等人的发现相反,没有发现正常质量排序的决定性证据。中微子质量排序分析必须依赖于订购 - 不合时宜的先验和参数化:可靠的结果应被视为对正常中微子质量排序偏爱的偏爱仅由数据驱动的,而我们在此处发现,在不同的先导和参数中,我们发现贝叶斯因子的差异最高为33个。在两个质量分裂和质量尺度上的参数化抽样的情况或仅通过正常的先验分布在单个中微子质量上取样的参数化采样情况将以订购不可知的先验来表示。在这方面,我们表明,有利于正常质量排序的当前意义应以$2.7σ$(即中微子振荡数据驱动)为$2.7σ$(即中等证据)。

The extraction of the neutrino mass ordering is one of the major challenges in particle physics and cosmology, not only for its implications for a fundamental theory of mass generation in nature, but also for its decisive role in the scale of future neutrinoless double beta decay experimental searches. It has been recently claimed that current oscillation, beta decay and cosmological limits on the different observables describing the neutrino mass parameter space provide robust decisive Bayesian evidence in favor of the normal ordering of the neutrino mass spectrum [arXiv:2203.14247]. We further investigate these strong claims using a rich and wide phenomenology, with different sampling techniques of the neutrino parameter space. Contrary to the findings of Jimenez et al [arXiv:2203.14247], no decisive evidence for the normal mass ordering is found. Neutrino mass ordering analyses must rely on priors and parameterizations that are ordering-agnostic: robust results should be regarded as those in which the preference for the normal neutrino mass ordering is driven exclusively by the data, while we find a difference of up to a factor of 33 in the Bayes factors among the different priors and parameterizations exploited here. An ordering-agnostic prior would be represented by the case of parameterizations sampling over the two mass splittings and a mass scale, or those sampling over the individual neutrino masses via normal prior distributions only. In this regard, we show that the current significance in favor of the normal mass ordering should be taken as $2.7σ$ (i.e. moderate evidence), mostly driven by neutrino oscillation data.

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