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The $b\tau j \etslash$ signal at the ongoing LHC experiments is simulatedwith Pythia in the mSUGRA and other models of SUSY breaking. Special attentionis given on the compatibility of this signature with the low mass neutralinodark matter (LMNDM) scenario consistent with WMAP data. In the mSUGRA model theabove signal as well as the LMNDM scenario are strongly disfavoured due to theconstraints from the on going SUSY searches at the LHC. This tension, however,originates from the model dependent correlations among the parameters in thestrong and electroweak sectors of mSUGRA. That there is no serious conflictbetween the LMNDM scenario and the LHC data is demonstrated by constructinggeneric phenomenological models such that the strong sector is unconstrained ormildly constrained by the existing LHC data and parameters in the electroweaksector, unrelated to the strong sector,yield DM relic density consistent withthe WMAP data. The proposed models, fairly insensitive to the conventional SUSYsearches in the jets + $\etslash$ and other channels, yield observable signalin the suggested channel for $\lum \gsim 1 \ifb$ of data. They are alsoconsistent with the LMNDM scenario and can be tested by the direct dark mattersearch experiments in the near future. Some of these models can be realized bynon-universal scalar and gaugino masses at the GUT scale.

Low mass neutralino dark matter in mSUGRA and more general models in the light of LHC data