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



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2899 more authors) (2018) Search for pair production of heavy vector-like quarks decaying into high-PT W bosons and top quarks in the lepton-plus-jets final state in pp collisions at √s=13 TeV with the ATLAS detector JOURNAL OF HIGH ENERGY PHYSICS, 2018 (8). 048-. ISSN 1126-6708, 1029-8479

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Abstract

A search is presented for the pair production of heavy vector-like B quarks, primarily targeting B quark decays into a W boson and a top 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, characterised by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, and multiple jets, of which at least one is b-tagged. No significant deviation from the Standard Model expectation is observed. The 95% confidence level lower limit on the B mass is 1350 GeV assuming a 100% branching ratio to Wt. In the SU(2) singlet scenario, the lower mass limit is 1170 GeV. The 100% branching ratio limits are found to be also applicable to heavy vector-like X production, with charge +5/3, that decay into Wt. This search is also sensitive to a heavy vector-like B quark decaying into other final states (Zb and Hb) and thus mass limits on B production are set as a function of the decay branching ratios.[Figure not available: see fulltext.].

Item Type: Article
Additional Information: 41 pages in total, author list starting page 25, 5 figures, 2 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2017-34/
Uncontrolled Keywords: Exotics, Hadron-Hadron scattering (experiments), vector-like quarks
Depositing User: Symplectic Admin
Date Deposited: 28 Aug 2018 15:46
Last Modified: 22 May 2026 20:33
DOI: 10.1007/JHEP08(2018)048
Open Access URL: https://doi.org/10.1007/JHEP08(2018)048
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3025635
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