On the breaking of mu-tau flavor symmetry

Abstract

In light of the observation of a relatively large ${\theta }_{13}^{}$, one has to consider breaking the $\mu$-$\tau$ symmetry properly which would otherwise result in a vanishing ${\theta }_{13}^{}$ (as well as ${\theta }_{23}^{}=\pi /4$). Therefore, we investigate various symmetry-breaking patterns and accordingly identify those that are phenomenologically viable. Furthermore, the symmetry-breaking effects arising from some specific physics (e.g., the renormalization group equation running effect) are discussed as well.

Comments: 14 pages, a contribution to the Conference on New Physics at the Large Hadron Collider (29 February to 4 March 2016), Singapore