Search 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 $\sqrt{s}$=7 TeV with the ATLAS detector

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2013) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 718, p. 1284 (2013)

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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 marc: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 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)=1 , a fourth-generation t′ quark with mass lower than 656 GeV is excluded at 95% confidence level. In addition, in light of the recent discovery of a new boson of mass ∼126 GeV at the LHC, upper limits are derived in the two-dimensional plane of BR(t′→Wb) versus BR(t′→Ht) , where H is the Standard Model Higgs boson, for vector-like quarks of various masses.
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Tanasijczuk, A. J., ATLAS, & et al. (2013). Search 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 $\sqrt{s}$=7 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 718, 1284. https://doi.org/10.1016/j.physletb.2012.11.071 (Original work published 2013)