A Search for ttbar Resonances in the Dilepton Channel in 1.04/fb of pp Collisions at sqrt(s) = 7 TeV

This note presents a search for a high mass ttbar resonance in pp collisions at \sqrt(s) = 7 TeV at the LHC. We search for such a resonance using the final state where both $W$ bosons from the top quark decay into either an electron and electron-neutrino or a muon and muon-neutrino (dilepton final state). The data were recorded by the ATLAS experiment during 2011 and correspond to a total integrated luminosity of 1.04/fb. No statistically significant excess above the Standard Model expectation is observed. Upper limits at the 95\% Confidence Limit (C.L) are set on the cross section times branching ratio of the resonance decaying to $t\bar{t}$ pairs as a function of the resonance pole mass. A lower mass limit of 0.84~TeV is set for the case of a Kaluza Klein gluon resonance in the Randall-Sundrum Model.