Reactor and Atmospheric Neutrino Mixing Angles' Correlation as a Probe for New Physics

TL;DR

This paper investigates how future neutrino experiments like DUNE can test high-energy physics models by analyzing the correlation between atmospheric and reactor neutrino mixing angles, potentially excluding certain models.

Contribution

It demonstrates that DUNE can effectively constrain or exclude specific flavor symmetry models based on neutrino mixing angle correlations.

Findings

DUNE can exclude the Tetrahedral Flavour Symmetry model at over 3σ in most parameter regions.

The correlation between mixing angles provides a powerful test for high-energy physics models.

Octant degeneracy impacts the sensitivity of DUNE to these models.

Abstract

We performed a simulation on the DUNE experiment to probe the capability of future neutrino long-baseline experiments' ability to constrain the parameter space of high-energy models by using the correlation between the atmospheric and reactor mixing angles. As an example, we took the Tetrahedral Flavour Symmetry model, which predicts a strong relation between the non-zero value of $\theta_{13}$ and deviation of $\theta_{23}$ from the maximality. We show that in this case, the model can realistically be excluded in more than $3\sigma$ for most of the parameter space. We also study the octant degeneracy at DUNE and its impact on the sensitivity of such models.