Dark matter abundance and electroweak baryogenesis in the CMSSM

The Minimal Supersymmetric Standard Model has a candidate dark matter parti cle in its spectrum, and may be able to generate the baryon asymmetry of th e Universe (BAU) at the electroweak phase transition. In the Constrained MS SM, we find the area of parameter space which is allowed by accelerator and precision tests, which produces a relic dark matter abundance in the obser vationally favored window 0.1 less than or similar to Omega h(2) less than or similar to 0.3, and where baryon plus lepton number violating processes are out of equilibrium after the electroweak phase transition. (C) 1999 Pub lished by Elsevier Science B.V. All rights reserved.