Possible Alternatives to Tri-bimaximal Mixing

TL;DR

This paper explores alternative neutrino mixing models based on different symmetry principles, compares their predictions with current data, and emphasizes the need for precise measurements to identify the correct flavor symmetry.

Contribution

It introduces new symmetry-based models for neutrino mixing and discusses how they can be refined to match experimental data.

Findings

Some models require perturbations for better data fit

Predictions vary for |U_{e3}|, sin^2 theta_{12}, sin^2 theta_{23}

Precise measurements are crucial for model discrimination

Abstract

Possible alternatives to tri-bimaximal mixing are presented based on other symmetry principles, and their predictions for |U_{e3}|, sin^2 theta_{12} and sin^2 theta_{23} are compared to the present neutrino mixing data. In some cases perturbations are required to give better agreement with the data, and the use of a minimal approach is illustrated. Precise experimental determinations of the mixing parameters will be required to decipher the correct mixing pattern and to pin down the appropriate flavor symmetry.