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A search for resonances produced in 7 TeV proton-proton collisions anddecaying into top-quark pairs is described. In this Letter events where thetop-quark decay produces two massive jets with large transverse momentarecorded with the ATLAS detector at the Large Hadron Collider are considered.Two techniques that rely on jet substructure are used to separate top-quarkjets from those arising from light quarks and gluons. In addition, each massivejet is required to have evidence of an associated bottom-quark decay. The dataare consistent with the Standard Model, and limits can be set on the productioncross section times branching fraction of a Z' boson and a Kaluza-Klein gluonresonance. These limits exclude, at the 95% credibility level, Z' bosons withmasses 0.70-1.00 TeV as well as 1.28-1.32 TeV and Kaluza-Klein gluons withmasses 0.70-1.62 TeV.

Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at sqrt(s) = 7 TeV