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A simple Standard Model Extension based on $T_7$ flavor symmetry whichaccommodates lepton mass and mixing with non-zero $\theta_{13}$ and CPviolation phase is proposed. At the tree- level, the realistic lepton mass andmixing pattern is derived through the spontaneous symmetry breaking by just onevacuum expectation value ($v$) which is the same as in the Standard Model.Neutrinos get small masses from one $SU(2)_L$ doublet and two $SU(2)_L$singlets in which one being in $\underline{1}$ and the two others in$\underline{3}$ and $\underline{3}^*$ under $T_7$ , respectively. The modelalso gives a remarkable prediction of Dirac CP violation$\delta_{CP}=172.598^\circ$ in both normal and inverted hierarchies which isstill missing in the neutrino mixing matrix.

Lepton mass and mixing in a simple extension of the Standard Model based on T7 flavor symmetry