Abstract
We show that in N = 2 SUSY GUTs, leptons and quarks tend to combine with their mirror partners and to acquire very large masses proportional to the grand-unification mass. We solve this problem by means of a replication of lepton and quark fields. Grand-unification now associates light leptons and quarks with heavy ones of masses ⋍ m X or 2 m X. The latter carry a non-vanishing value of the central charge 〈 Z〉 = ± m X or ± 2 m X (which may be viewed as the fifth or sixth component of the covariant momentum). The exchanges of the grand-unification gauge bosons do not induce proton decay, and the proton is stable, in minimal N = 2 SUSY GUTs. Moreover the grand-unification mass does not get renormalized.
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