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We discuss renormalization effects on neutrino masses and mixing angles in asupersymmetric string-inspired SU(4) X SU(2)_L X SU(2)_R X U(1)_X model, withmatter in fundamental and antisymmetric tensor representations and singletHiggs fields charged under the anomalous U(1)_X family symmetry. The quark,lepton and neutrino Yukawa matrices are distinguished by differentClebsch-Gordan coefficients. The presence of a second U(1)_X breaking singletwith fractional charge allows a more realistic, hierarchical light neutrinomass spectrum with bi-large mixing. By numerical investigation we find a regionin the model parameter space where the neutrino mass-squared differences andmixing angles at low energy are consistent with experimental data.Comment: 9 pages, 7 figures; references adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Renormalization effects on neutrino masses and mixing in a string-inspiredSU(4)×SU(2)L×SU(…