Abstract
We consider the problem of SU(2)×U(1) breaking in supersymmetric GUTs. In particular, we focus on models in which supersymmetry is broken at an intermediate scale. We review the arguments that light singlet fields coupled to Higgs spoil the hierarchy. We show explicitly how auxiliary fields associated with heavy particles drop out of the low-energy theory, as expected from decoupling. Theories with only quarks, leptons and Higgs thus have directions in which all quartic couplings vanish. Conditions on the Higgs mass matrix for obtaining the correct pattern of breaking are stated, and an explicit model satisfying these conditions is constructed. The relevance of these considerations to supergravity theories is discussed.
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