1201.3755 (S. Dev et al.)

Broken S3 Symmetry in the Neutrino Mass Matrix and Non-Zero theta_{13}    [PDF]

S. Dev, Radha Raman Gautam, Lal Singh

We study the effects of breaking S3 symmetry in the neutrino mass matrix for
the masses and mixing matrix of neutrinos. At zeroth order the model gives
degenerate neutrino masses and accommodates tribimaximal mixing. We introduce
perturbations in terms of a small and complex parameter. The perturbations are
introduced in a manner such that the S3 symmetry is broken by its elements in
the same representation. Successive perturbations introduce mass splitting,
sizable non-zero reactor mixing angle and CP violation. This scheme of breaking
S3 symmetry can reproduce a relatively large reactor mixing angle as suggested
by the recent T2K results. The effective neutrino mass is predicted to be large
which is testable in the ongoing and forthcoming neutrinoless double beta decay
experiments.

View original: http://arxiv.org/abs/1201.3755