Lessons from the first JUNO results

Abstract

First results from the JUNO reactor neutrino experiment already determine with world-leading precision the small neutrino squared-mass splitting $\Delta m_{21}^2$ and the mixing angle ${\theta }_{12}$. In this article we perform an exploratory study beyond these, taking advantage of the first JUNO data release to discuss its sensitivity to the large squared-mass splitting, $\Delta m_{3\ell }^2$. When combined with constraints from global oscillation data, this may already contain some information on the neutrino mass ordering. Indeed, we find that the combination of the complementary $\Delta m_{3\ell }^2$-determinations gives a slight preference for Normal Ordering, with a p-value for Inverted Ordering of 2%-2.6% ($2.2\sigma$-$2.3\sigma$). We study the robustness of this result with respect to potential systematic uncertainties and statistical fluctuations. Taken at face value, a full global analysis of oscillation data including the publicly available JUNO information and data leads to a preference for Normal Ordering with $\Delta {\chi }^2=4.6$ and 9.4 without and with Super-K and IceCube-24 atmospheric neutrino data, respectively.

Comments: 20 pages, 8 figures, v2: version published in JHEP + note on minor analysis improvements