Neutrino Mixing With Non-Zero $\theta_{13}$ In Zee-Babu Model

Understand

The exact solution for the neutrino mass matrix of the Zee-Babu model is derived.

• Tribimaximal mixing imposes conditions on the Yukawa couplings, from which the normal mass hierarchy is preferred.
• The derived conditions give a possibility of Majorana maximal $\mathrm{CP}$ violation in the neutrino sector.
• We have shown that non-zero $\theta_{13}$ is generated if Yukawa couplings between leptons almost equal to each other.