UNSPECIFIED (2012) Search for Pair Production of a Heavy Up-Type Quark Decaying to a W Boson and a b Quark in the lepton+jets Channel with the ATLAS Detector. Physical review letters, 108 (26): 261802. ISSN 1079-7114
PhysRevLett.108.261802.pdf - Published Version
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Abstract
A search is presented for production of a heavy up-type quark (t′) together with its antiparticle, assuming subsequent decay to a W boson and a b quark, t′t¯′→W+bW−b¯. The search is based on 1.04 fb−1 of proton-proton collisions at s√=7 TeV collected by the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton+jets 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 of 404 GeV is set for the mass of the t′ quark.