Discrete symmetries and neutrino masses
  We constructed a model of neutrino masses using Froggatt-Nielsen mechanism with $U(1) \times Z_3 \times Z_2$ flavor symmetry. The model predicts that $(2/3)m_2/m_3 \sim \sqrt{2}\sin\theta_{13}$ at lepton number violating scale $M_1$. It is shown that the small values for $m_2/m_3$ and $\sin\theta_{13}$ are consequences of breaking discrete symmetries. 
Kim Siyeon