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We consider a model for quark and lepton masses and mixings based on S4flavor symmetry. The model contains six Higgs doublets where three of them givemass to the leptons and the other three gives mass to the quarks. Chargedfermion and quark masses arise from renormalizable interactions while neutrinoMajorana masses are generated through effective dimension five Weinbergoperator. From the study of the minimization of the scalar potential we found aresidual mu-tau symmetry in the neutrino sector predicting zero reactor angleand maximal atmospheric angle and for the quark sector we found a four-zerotexture. We give a fit of the mass hierarchies and mixing angles in the quarksector.

An S4 model for quarks and leptons with maximal atmospheric angle