Possible Alternatives to Tri-bimaximal Mixing

Understand

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.