A search for ttbar resonances in the lepton plus jets final state with ATLAS using 4.7 fb^-1 of pp collisions at sqrt(s) = 7 TeV

Understand

A search for new particles that decay into top quark pairs (ttbar) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb^-1 of proton-proton (pp) collision data collected at a center-of-mass energy sqrt(s)=7 TeV.

• In the ttbar --> WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically.
• The ttbar system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis.
• A search for local excesses in the number of data events compared to the Standard Model expectation in the ttbar invariant mass spectrum is performed.