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AuthorsG. Aad, . et al, R. Aben, S. Bentvelsen, A.P. Colijn, P. de Jong, L. de Nooij, A.D. Doxiadis, H. Garitaonandia, D.A.A. Geerts, M. Gosselink, M.S. Kayl, E. Koffeman, H. Lee, F. Linde, J. Mahlstedt, J. Mechnich, I. Mussche, J.P. Ottersbach, P. Pani, M. Rijpstra, N. Ruckstuhl, M. Tsiakiris, R. van der Geer, R van der Leeuw, E. van der Poel, I. van Vulpen, J.C. Vermeulen, M. Vreeswijk, Z. van Kesteren, E. van der Kraaij
TitleSearch for pair production of heavy top-like quarks decaying to a high-pT W boson and a b quark in the lepton plus jets final state at √ s = 7 TeV with the ATLAS detector
JournalPhysics Letters B
Volume718
Year2013
Issue4-5
Pages1284-1302
ISSN03702693
FacultyFaculty of Science
Institute/dept.FNWI: Institute for High Energy Physics (IHEF)
AbstractA search is presented for production of a heavy up-type quark (t′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 View the MathML sourcet′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.
NoteAtlas Collaboration
Document typeArticle
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