We examine the question of whether neutralinos produced at the LHC can beshown to be the particles making up the astronomically observed dark matter.If the WIMP alllowed region lies in the SUGRA coannihilation region, then astrong signal for this would be the unexpected near degeneracy of the stau andneutralino i.e., a mass difference ΔM= (5-15) GeV. For the mSUGRA modelwe show such a small mass difference can be measured at the LHC using thesignal 3r+jet+E_T~(miss). Two observables, opposite sign minus like pairs andthe peak of the TT mass distribution allows the simultaneous determinationof AM to 15% and the gluino mass M_gto be 6% at the benchmark point ofM_g=850 GeV, A0=0, μ >0 with 30 fb~(-1).With 10 fb~(-1), ΔM can be determinedto 22% and one can probe the parameter space up to m,12=700 GeV with 100 fb- 1
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