We develop an approach to the origin of three generations of the standard model fermions fi om one generation in a higher-dimensional theory, where four-dimensional fermions appear as zero modes trapped in the core of a topological defect, and the hierarchy of masses and mixings is produced by wave function overlaps in extra dimensions. We present a model with unbroken U(I) symmetry where three zero modes appear on an,Abrikosov-Nielsen-Olesen vortex due to nontrivial scalar-fermion interactions. (C) 2001 Published by Elsevier Science B.V. [References: 23]
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