A Search for Heavy Majorana Neutrino and WR in dilepton plus jets events with the ATLAS detector in pp collisions at √s = 7TeV

This note reports on a search for hypothetical heavy Majorana neutrinos and $W_R$ gauge bosons in the context of the Left-Right Symmetric Model, in events with two isolated high-\pT\ same-sign or opposite-sign leptons and high-\pT\ hadronic jets. The data were collected with the ATLAS detector in proton-proton collisions at \rts=7~\TeV, at the CERN Large Hadron Collider (LHC), and correspond to an integrated luminosity of 34~\ipb. No excess above the Standard Model background expectation is observed. Mass-dependent limits on the production cross-sections times branching ratio are presented for $W_R$ gauge bosons masses below 1.8~\TeV. The exclusion region is significantly larger than that obtained from previous measurements.