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 $m_{\tilde{g}}<m_{\tilde{q}}$ and $m_{\tilde{g}}\sim m_{\tilde{q}}$. The supersymmetry 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 $m_{\tilde{g}}\sim 800\mathrm{GeV}$ over both the parameter bands with an integrated luminosity $5{\mathrm{fb}}^{-1}$.

• Received 12 October 2011

DOI:https://doi.org/10.1103/PhysRevD.85.035024