The Constrained MSSM Revisited
  Within the Constrained Minimal Supersymmetric Model (CMSSM) it is possible to predict the low energy gauge couplings and masses of the 3 generation particles from a few supergravity inspired parameters at the GUT scale. Moreover, the CMSSM predicts electroweak symmetry breaking due to large radiative corrections from the Yukawa couplings, thus relating the $Z^0$ boson mass to the top quark mass via the renormalization group equations (RGE). In addition, the cosmological constraints on the lifetime of the universe are considered in the fits. The new precise measurements of the strong coupling constant and the top mass as well as higher order calculations of the $b \to s\gamma$ rate exclude perfect fits in the CMSSM, although the discrepancies from the best fit parameters are below the $2\sigma$ level. 
W. de Boer (University of Karlsruhe, Germany)