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A search for a high mass ttbar resonance in pp collisions at sqrt(s) = 7 TeVat the LHC is presented. We search for such a resonance using the final statewhere the $W$ bosons from the top quark decay into either an electron or a muon(dilepton final state). The data were recorded by the ATLAS experiment during2011 and correspond to a total integrated luminosity of L = 1.04 fb^-1. Nostatistically significant excess above the Standard Model expectation isobserved. Upper limits at the 95% Confidence Level (C.L.) are set on the crosssection times branching ratio of the resonance decaying to ttbar pairs as afunction of the resonance mass. A lower mass limit of 0.84 TeV is set for thecase of a Kaluza-Klein gluon resonance in the Randall-Sundrum Model.

A Search for ttbar Resonances in the Dilepton Channel in 1.04 fb^-1 of pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment