Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/77350
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Type: Journal article
Title: Search for pair production of heavy top-like quarks decaying to a high-p(T) W boson and a b quark in the lepton plus jets final state at √s=7 TeV with the ATLAS detector
Other Titles: Search for pair production of heavy top-like quarks decaying to a high-p(T) W boson and a b quark in the lepton plus jets final state at root s=7 TeV with the ATLAS detector
Author: Jackson, P.
Soni, N.
White, M.
Citation: Physics Letters B, 2013; 718(4-5):1284-1302
Publisher: Elsevier Science BV
Issue Date: 2013
ISSN: 0370-2693
Contributor: Jackson, Paul Douglas
Statement of
Responsibility: 
ATLAS Collaboration
Abstract: A search is presented for production of a heavy up-type quark (t′) together with its antiparticle, assuming a significant branching ratio for subsequent decay into a W boson and a b quark. The search is based on 4.7 fb⁻¹ of pp collisions at √s=7 TeV recorded in 2011 with 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, large missing transverse momentum and at least three jets. The analysis strategy relies on the substantial boost of the W bosons in the t′¯t′ signal when mt′≳400 GeVmt′≳400 GeV. No significant excess of events above the Standard Model expectation is observed and the result of the search is interpreted in the context of fourth-generation and vector-like quark models. Under the assumption of a branching ratio BR(t′→Wb)=1BR(t′→Wb)=1, a fourth-generation t′t′ quark with mass lower than 656 GeV656 GeV is excluded at 95% confidence level. In addition, in light of the recent discovery of a new boson of mass ∼126 GeV∼126 GeV at the LHC, upper limits are derived in the two-dimensional plane of BR(t′→Wb)BR(t′→Wb) versus BR(t′→Ht)BR(t′→Ht), where H is the Standard Model Higgs boson, for vector-like quarks of various masses.
Description: ATLAS Collaboration member: Paul Douglas Jackson of School of Chemistry and Physics, University of Adelaide, Adelaide, Australia.
Rights: © 2012 CERN. Published by Elsevier B.V. All rights reserved.
RMID: 0020126426
DOI: 10.1016/j.physletb.2012.11.071
Appears in Collections:Chemistry and Physics publications

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