A Search for $tar{t}$ Resonances in the Dilepton Channel in 1.04 fb$^{-1}$ of $pp$ collisions at $sqrt{s} = 7$ TeV with the ATLAS experiment

A search for a high mass $tar{t}$ resonance in $pp$ collisions at $sqrt{s} = 7$~TeV at the LHC is presented. We search for such a resonance using the final state where the $W$ 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 ${cal L} = 1.04~fb^{-1}$. No statistically significant excess above the Standard Model expectation is observed. Upper limits at the 95% Confidence Level are set on the cross section times branching ratio of the resonance decaying to $tar{t}$ pairs as a function of the resonance 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.