Probing a mixed neutralino dark matter model at the 7 TeV LHC.

We have analyzed the prospect of probing a nonuniversal gaugino mass model of mixed bino-Higgsino dark matter at the current 7 TeV run of LHC. It provides cosmologically compatible dark matter relic density over two broad bands of parameters, corresponding to mg < m&qmacr; and m&gmacr; ∼ m&qmacr;. The supersym-metry spectrum of this model has two distinctive features: (i) an approximate degeneracy among the lighter chargino and neutralino masses, and (ii) an inverted mass hierarchy of squark masses. We find that these features can be exploited to obtain a viable signal up to m&gmacr; ∼ 800 GeV over both the parameter bands with an integrated luminosity 5 fb-1. [ABSTRACT FROM AUTHOR]