Abstract
We study the phenomenology of the flipped SU (5) × U (1) superstring model emphasizing the Higgs and fermion mass spectra. Our calculations take into account up to quintic, rigorously derived, nonrenormalizable terms in the superpotential. We also consider the role of the hidden sector on observable sector physics, and find it to be manifold and decisive. We conclude that at low energies a realistic model will only have one pair of Higgs doublets with adequate electroweak mixing, and no exotic particles besides the ones in the supersymmetric standard model. These two results are a direct consequence of the inclusion in the analysis of nonrenormalizable terms, and have been obtained here for the first time. We also deduce an upper bound on the top quark mass of m t≲180 GeV, and find that the hierarchichal fermion mass spectrum follows naturally in this model.
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