Description
Recently direct detection experiments claim Dark Matter like events. If they were
caused by WIMPs indeed, then they point towards rather light (a few to 50 GeV,
depending on experiments) Dark Matter particles. We review the plausibility of light
neutralinos with relatively large elastic scattering cross sections in the Minimal
and Next-to-Minimal Supersymmetric Standard Models (MSSM & NMSSM). Applying
cosmological, new particle searches, B-physics and electroweak precision
constraints, we explore the parameter spaces using a Monte Carlo Markov Chain. We then check whether there are any points providing neutralinos with the suited cross section and mass for direct detection experiments. We take into account the
no-signal claim of Xenon100 and TeVatron constraints to the Higgs sector to further
analyse those points. While MSSM fails to provide an interesting candidate, the
NMSSM can overcome all constraints and produce neutralinos in the region of
interest.
