Collider searches and cosmology in the MSSM with heavy scalars

Abstract

In a variety of supersymmetric extensions of the standard model, the scalar partners of the quarks and leptons are predicted to be very heavy and beyond the reach of next-generation colliders. For instance, the realization of electroweak baryogenesis in supersymmetry requires new sources of $CP$ violation, which can only be naturally accommodated with electric dipole moment constraints if the first- and second-generation scalar fermions are beyond the TeV scale. Also, in focus-point supersymmetry and split supersymmetry the scalar fermions are very heavy. In this work, the phenomenology of scenarios with electroweak baryogenesis and in the focus-point region at the CERN LHC and ILC is studied, which becomes challenging due to the presence of heavy scalar fermions. Implications for the analysis of baryogenesis and dark matter are deduced. It is found that precision measurements of superpartner properties allow an accurate determination of the dark matter relic density in both scenarios, while important but only incomplete information about the baryogenesis mechanism can be obtained.