Left-right symmetric model with μ harr; τ symmetry

We present a Left-right symmetric model with a (Z2)3 discrete symmetry which realizes softly broken μ ↔ τ symmetry, which is broken at tree level in the effective neutrino mass matrix by mass difference in the diagonal Dirac mass terms. Lepton mixings arise from Majorana mass matrix. We determined θ13, and the deviation from maximal value of θATM in terms of the hierarchy scale, m3, and a single free parameter, hs. © 2009 American Institute of Physics.