Target Neutrino Mass Precision for Determining the Neutrino Hierarchy
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(2019)cite arxiv:1907.04331Comment: 5 pages, 1 figure. Comments welcome.

Recent works combining neutrino oscillation and cosmological data to determine the neutrino hierarchy found a range of odds in favour of the normal hierarchy. These results arise from differing approaches to incorporating prior knowledge about neutrinos. We develop a hierarchy-agnostic prior and show that the hierarchy cannot be conclusively determined with current data. The determination of the hierarchy is limited by the neutrino mass scale $\Sigma_\nu$ measurement. We obtain a target precision of $\sigma(\Sigma_\nu) = 0.014$ eV for conclusively establishing the normal hierarchy with future data.
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