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We address the question how light the lightest MSSM neutralino can be as darkmatter candidate in a scenario where all supersymmetric scalar particles areheavy. The hypothesis that the neutralino accounts for the observed dark matterdensity sets strong requirements on the supersymmetric spectrum, thus providingan handle for collider tests. In particular for a lightest neutralino below 100GeV the relic density constraint translates into an upper bound on the Higgsinomass parameter $\mu$ in case all supersymmetric scalar particles are heavy. Onecan define a simplified model that highlights only the necessary features ofthe spectrum and their observable consequences at the LHC. Reinterpretingrecent searches at the LHC we derive limits on the mass of the lightestneutralino that, in many cases, prove to be more constraining than dark matterexperiments themselves.

LHC Tests of Light Neutralino Dark Matter without Light Sfermions