Search for pair production of a heavy up-type quark decaying to a W boson and a b quark in the lepton_s16jets channel with the ATLAS detector

Abstract

A search is presented for production of a heavy up-type quark (t_s14) together with its antiparticle, assuming subsequent decay to a W boson and a b quark, t_s14t_s14bar -> W_s16b W-bbar. The search is based on 1.04 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV collected by the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton_s16jets final state, characterized by a high transverse momentum isolated electron or muon, high missing transverse momentum and at least three jets. No significant excess of events above the background expectation is observed. A 95% C.L. lower limit is set at m(t_s14) > 404 GeV.