DYNAMICAL GENERATION OF THE GAUGE HIERARCHY IN SUSY-GUTS

We make a review of the recently proposed supersymmetric hypercolor ga uge theory with six flavors of quarks interacting strongly at the gran d unification scale, where dynamical breaking of the grand unified SU( 5)(GUT) produces a massless pair of composite color-triplet states. Yu kawa interactions between elementary Higgs multiplets and the hyperqua rks yield a pair of massless SU(2)(L) doublets, giving large masses to the color-triplet partners. We prove that this pair of massless Higgs doublets survives quantum corrections and remains in the low-energy s pectrum as far as the supersymmetry is unbroken. Hence this model real izes naturally the large mass hierarchy in the grand unified theories. We also show that the dangerous dimension-five operators for nucleon decays are suppressed simultaneously.