A4-based see-saw model for realistic neutrino masses and mixing

Understand

We present an $A4$-based model where neutrino masses arise from a combination of see-saw mechanisms.

• The model is motivated by several small mixing and mass parameters indicated by the data.
• These are $\theta_{13}$, the solar mass splitting, and the small deviation of $\theta_{23}$ from maximal mixing (= $\pi/4$).
• We take the above as indications that at some level the small quantities are well-approximated by zero.