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Scientific article
Open access
English

Search for pair production of heavy vector-like quarks decaying to high- p T W bosons and b quarks in the lepton-plus-jets final state in pp collisions at √s = 13 TeV with the ATLAS detector

ContributorsATLAS Collaboration
Published inJournal of High Energy Physics, vol. 1710, p. 141-181
Collection
  • Open Access - SCOAP3
Publication date2017
Abstract

A search is presented for the pair production of heavy vector-like T quarks, primarily targeting the T quark decays to a W boson and a b -quark. The search is based on 36.1 fb −1 of pp collisions at √s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data are analysed in the lepton-plus-jets final state, including at least one b -tagged jet and a large-radius jet identified as originating from the hadronic decay of a high-momentum W boson. No significant deviation from the Standard Model expectation is observed in the reconstructed T mass distribution. The observed 95% confidence level lower limit on the T mass are 1350 GeV assuming 100% branching ratio to Wb . In the SU(2) singlet scenario, the lower mass limit is 1170 GeV. This search is also sensitive to a heavy vector-like B quark decaying to Wt and other final states. The results are thus reinterpreted to provide a 95% confidence level lower limit on the B quark mass at 1250 GeV assuming 100% branching ratio to Wt ; in the SU(2) singlet scenario, the limit is 1080 GeV. Mass limits on both T and B production are also set as a function of the decay branching ratios. The 100% branching ratio limits are found to be applicable to heavy vector-like Y and X production that decay to Wb and Wt , respectively.

Keywords
  • Exotics
  • Hadron-Hadron scattering (experiments)
Citation (ISO format)
ATLAS Collaboration. Search for pair production of heavy vector-like quarks decaying to high- p T W bosons and b quarks in the lepton-plus-jets final state in pp collisions at √s = 13 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2017, vol. 1710, p. 141–181. doi: 10.1007/JHEP10(2017)141
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Article (Published version)
Identifiers
ISSN of the journal1029-8479
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