Viability of $A_4$, $S_4$ and $A_5$ Flavour Symmetries in Light of the First JUNO Result

Abstract

We update the analysis of the viability of the lepton mixing patterns originating from $A_4$, $S_4$ and $A_5$ discrete flavour symmetries and leading to predictions for the solar neutrino mixing angle, ${\theta }_{12}$. We perform a statistical analysis using as an input (i) the results of the latest global fit to neutrino oscillation data, and (ii) the first JUNO measurement of ${\sin }^2{\theta }_{12}$. Out of the five (four) cases compatible with the global data at $3\sigma$ for normal (inverted) neutrino mass ordering, only three (two) cases remain compatible with the global data at the same confidence level after taking into account the JUNO result.

Comments: 13 pages, 3 figures, 2 tables; statistical analysis slightly improved; Fig. 3 with likelihood profiles for ${\sin }^2{\theta }_{23}$ and corresponding discussion added; several comments and references added; conclusions unchanged; to appear in PLB