  We address the problem of a search at the LHC for a neutralino whose mass is
around 10 GeV, i.e. in the range of interest for present data of direct search
for dark matter particles in the galactic halo. This light neutralino is here
implemented in an effective Minimal Supersymmetric extension of the Standard
Model at the electroweak scale without requirement of a gaugino-mass
unification at a grand unification scale. Within this model we select a
representative benchmark and determine its prospects of reconstructing the main
features of the model at different stages of the LHC runs.
