2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45041This talk is based on work performed with Graham Ross and is a very concise summary of our soon to be published paper. Here we present a revision of the analysis of sphaleron baryon-number violating processes in the standard model including lepton-mass effects. We find the surprising result that a GUT-scale matter-asymmetry can survive the $B$ and $L$ violating sphaleron interactions even though ($B- L$) is conserved and equals zero for all temperatures. We extend the analysis to cover the minimal supersymmetric standard model (MSSM). As a new result we present the MSSM analysis below the temperature of electroweak breaking and for $B-L=0$ at all temperaturestalk given at the EPS-HEP conference in Marseille, July 1993; based on work done together with Graham Ross; 3 pages of Latex, with conference style fileHigh Energy Physics - Phenomenologytext