On the parameters of the minimal supergravity model

We study systematically the interplay of the parameters of the minimalN=1 supergravity model in a large domain of the parameter space. We make use of the renormalization group equations and the requirement of a correct electroweak symmetry breaking. Particular attention is paid to the dependence on the top mass and the ratio of the two vacuum expectation values, tan β=v 2/v 1. We also investigate the mass spectrum of the supersymmetric particles within the allowed parameter range and discuss its relevance for LEP.