Abstract
Quark-lepton mass matrices are studied in an orbifold model with three families of SU(3)×SU(2)×U(1) n . It is found that pure stringly effects cannot explain the mass hierarchy of quarks and leptons but can explain the smallness of mixing angles. Some constraints are required on R/ α′ and the vacuum expectation values of Higgs scalars in order to derive realistic values of the quark-lepton masses and the mixing angles. This model and some others predict the existence of pseudo-Goldstone bosons with masses derived from stringy effects.
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