Neutrino texture-zeros after JUNO's first results: Implications for long-baseline neutrino experiments

TL;DR

This paper examines how JUNO's recent precise measurements influence the viability of neutrino mass matrix textures and explores how upcoming experiments like DUNE can further test these theoretical structures.

Contribution

It updates the status of neutrino mass matrix texture-zeros using JUNO data and analyzes their testability at DUNE and T2HK experiments.

Findings

JUNO data rules out one two-zero texture.

JUNO improves predictions for neutrino parameters.

DUNE and T2HK can probe allowed texture-zero scenarios.

Abstract

The recent results from the JUNO reactor neutrino experiment have significantly improved our knowledge of the solar mixing angle $\theta_{12}$ and the solar mass splitting $\Delta m^2_{21}$. We study the impact of these improved estimates on the validity of texture-zeros in the light neutrino mass matrix by assuming neutrinos to be of Majorana nature. Considering a diagonal charged lepton basis, we revisit the previously allowed one-zero and two-zero textures and check their validity by using updated neutrino data from JUNO. While JUNO data rule out one previously allowed two-zero texture, they also make predictions for other neutrino parameters more precise. We finally study the prospects of probing the currently allowed texture-zeros and their predicted correlations among neutrino parameters at the Deep Underground Neutrino Experiment (DUNE). The inclusion of JUNO and reactor experiments strengthens DUNE's ability to constrain the allowed parameter space of both one-zero and two-zero textures. We also observe that DUNE benefits substantially from the complementarity with the T2HK experiment.