Search for pair production of a heavy up-type quark decaying to a w boson and a b quark in the lepton plus jets channel with the ATLAS Detector
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KünyeAad, G, Abbott, B., Abdallah, J., Abdelalim, A.A., Abdesselam, A., Abdinov, O. ... ATLAS Collaboration. (2012). Search for pair production of a heavy up-type quark decaying to a w boson and a b quark in the lepton plus jets channel with the ATLAS Detector. Physical Review Letters, 108 (26). http://dx.doi.org/10.1103/PhysRevLett.108.261802.
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) over bar' -> W(+)bW(-)(b) over bar. The search is based on 1.04 fb(-1) of proton-proton collisions at root 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.