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KUNS-2166 Lepton Flavor Model from ∆(54) Symmetry

By Yusuke Shimizu and Morimitsu Tanimoto


We present the lepton flavor model with ∆(54), which appears typically in heterotic string models on the T 2 /Z3 orbifold. Our model reproduces the tri-bimaximal mixing in the parameter region around degenerate neutrino masses or two massless neutrinos. We predict the deviation from the tri-bimaximal mixing by putting the experimental data of neutrino masses in the normal hierarchy of neutrino masses. The upper bound of sin 2 θ13 is 0.01. There is the strong correlation between θ23 and θ13. Unless θ23 is deviated from the maximal mixing considerably, θ13 remains to be tiny

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