Abstract
We examine the status of light neutralinos in an effective MSSM at the electroweak scale. We discuss this model in the light of dark matter direct detection and show that it fits quite well the DAMA/LIBRA and CoGeNT annual modulation results, together with the recently reported CRESST excess of events when interpreted as a signal of dark matter. The analysis of light-neutralino models is implemented by the new measurements at the Tevatron, B-factories and LHC which provide significant constraints on the MSSM model. We examine in detail all these new data and show that the neutralino mass has a lower bound of 8–9 GeV, with interesting correlations with the other parameters of the model. Direct detection cross sections naturally fall in the range outlined by the direct detection positive experiments.
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