U(1)ₐ Models of Fermion Masses Without a μ Problem

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We discuss the connection between models of fermion masses and mixing involving a string-motivated flavor/generation U(1)ₐ gauge symmetry and the μ term. We point out that in a certain class of such models the flavor physics can provide an appealing solution to the μ problem, naturally yielding a μ O(mW). A simple relationship between the U(1)ₐ charge qₕ of the μ-term and the average generational U(1)ₐ charges of the down quark and leptonic sectors is derived. Finally, we construct an explicit model illustrating our results.