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arXiv · 2511.19408

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

S. T. Petcov·A. V. Titov
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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.

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S. T. Petcov, A. V. Titov. 2025-11-24. Viability of $A_4$, $S_4$ and $A_5$ Flavour Symmetries in Light of the First JUNO Result. https://doi.org/10.1016/j.physletb.2026.140295

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