Abstract
We introduce a N=1 supergravity model with a very simple hidden sector coupled to the electroweak gauge and Higgs sectors of the minimal supersymmetric standard model. At the classical level, supersymmetry and SU(2)×U(1) are both spontaneously broken, with vanishing vacuum energy. Two real flat directions control the two symmetry-breaking scales m(3/2) and m(Z). The two massless scalars are a gauge singlet and the standard Higgs boson. All other unobserved particles have masses of order m(3/2). This may be a new starting point for studying the compatibility of naturalness with the observed mass hierarchies.
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