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In this work we explore the 7 TeV LHC implication on light top squark (stop)and investigate discovery limits at both 8 and 14 TeV LHC using same-signdilepton signature. We consider a simplified spectrum with gluino pairproduction followed by heavy gluino decay into on-shell stop and top quark inpair. The light stop is then assumed to uniquely decay into c\tilde{\chi}_1^0,bW^+\tilde{\chi}_1^0 or t\tilde{\chi}_1^0. The same-sign dilepton search at 7TeV LHC places a lower bound of about 800 GeV on the gluino mass in thisscenario. We find that the 8 TeV LHC with 30 fb^{-1} luminosity can reach 960(900) GeV, 1.2 (1.0) TeV and 1.3 (1.1) TeV of gluino mass for stop decayproduct of c\tilde{\chi}_1^0, bW^+\tilde{\chi}_1^0 and t\tilde{\chi}_1^0respectively, corresponding to 3 (5) \sigma significance. The discovery limitsof heavy gluino mass at the 14 TeV LHC with 100 fb^{-1} luminosity are 1.45(1.35) TeV, 1.6 (1.55) TeV and 1.9 (1.68) TeV.

Probing NLSP Top Squark from Heavy Gluino at the LHC