Probing a Mixed Neutralino Dark Matter Model at the 7 TeV LHC

Abstract

We have analyzed the prospect of probing a non-universal 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 $m_{\text{gl}}<m_{\text{sq}}$ and $m_{\text{gl}}\sim m_{\text{sq}}$. The SUSY 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 upto $m_{\text{gl}}\sim$ 800 GeV over both the parameter bands with an integrated luminosity 5/fb.

Comments: Latex, 15 pages, one figure