评“正常中微子族的强有力证据”
Comment on "Strong Evidence for the Normal Neutrino Hierarchy"
摘要：
在预印本arxiv：1703.03425中，声称有“强有力的证据”支持正常的中微子质量排序。作者得到贝叶斯赔率为42：1，有利于正常排序。他们的结论是基于对三个中微子质量采用平坦对数先验。这样的假设有利于质量的分级谱，这更容易适应正常的质量排序，因此他们的先验假设使得反向排序不太可能是先验的。我们认为，所谓的“证据”的正常秩序几乎完全是由所采用的前，而不是由于数据本身。
英文摘要：
In the preprint arxiv:1703.03425 "strong evidence" for the normal neutrino mass ordering is claimed. The authors obtain Bayesian odds of 42:1 in favour of the normal ordering. Their conclusion is based on adopting a flat logarithmic prior for the three neutrino masses. Such an assumption favours a hierarchical spectrum for the masses, which is much easier to accommodate for the normal mass ordering, and hence their prior assumption makes the inverted ordering much less likely a priori. We argue that the claimed "evidence" for normal ordering is almost entirely driven by the adopted prior and not due to the data itself.
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