Abstract
A new mechanism (the use of the nonrenormalizable interactions for the suppression of the dangerous interactions of the Higgs triplets with quark) for the explanation of the fine-tuning problem is proposed. In the case of supersymmetric E 5 grand unified theories, which may arise as the low-energy limit of superstring theory, we predict nontrivial relations between Yukawa coupling constants of the low-energy superpotential.
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