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We investigate the spectrum of supersymmetric grand unification models basedon the gauge groups SU(5), SO(10) and E6, paying particular attention to thefirst and second generation. We demonstrate how the measurement of the first orsecond generation sfermion spectrum may be used to constrain the underlyinggrand unification structure. The smallness of first and second generationYukawa interactions allows us to perform an analytic analysis, derivingexpressions for the high scale parameters in terms of the low scale sfermionmasses. We also describe a sum rule that provides an SO(10) mass prediction,distinct from SU(5), and discuss E6 models, both with and without extra exoticmatter at low energies. The derived relations are compared with numericalresults including two-loop running and the full Yukawa dependence.

Constraining Grand Unification using first and second generation sfermions