  We investigate the constraints to the light neutralino dark matter scenario
in the minimal supersymmetric standard model from available experimental
observations such as decays of B and K meson, relic dark matter abundance, and
the search for neutralino and Higgs production at colliders. We find that two
regions of the MSSM parameter space fulfill all the constraints: a fine-tuned
strip with large tan beta where the lightest neutralino can be as light as 8
GeV, and a low tan beta region providing a neutralino mass larger than 16 GeV.
The large tan beta strip, which can be compatible with recently reported
signals from direct detection experiments, can be fully tested by means of
low-energy observables and, in particular, by B_s -> mu mu and Higgs bosons
searches at the LHC within the upcoming months.
