SUPERSYMMETRIC PARTICLE SPECTRUM

We examine the spectrum of supersymmetric particles predicted by grand unified theoretical (GUT) models where the electroweak symmetry break ing is accomplished radiatively. We evolve the soft-supersymmetry-brea king parameters according to the renormalization group equations (RGE) . The minimization of the Higgs potential is conveniently described by means of tadpole diagrams. We present complete one-loop expressions f or these minimization conditions, including contributions from the mat ter and the gauge sectors. We concentrate on the low tanbeta fixed poi nt region (that provides a natural explanation of a large top quark ma ss) for which we find solutions to the RGE satisfying both experimenta l bounds and fine-tuning criteria. We also find that the constraint fr om the consideration of the lightest supersymmetric particle as the da rk matter of the Universe is accommodated in much of parameter space w here the lightest neutralino is predominantly gaugino. The supersymmet ric mass spectrum displays correlations that are model independent ove r much of the GUT parameter space.