Search for pair production of heavy vector-like quarks decaying into high-<i><sub>PT</sub></i> <i>W</i> bosons and top quarks in the lepton-plus-jets final state in <i>pp</i> 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-<i><sub>PT</sub></i> <i>W</i> bosons and top quarks in the lepton-plus-jets final state in <i>pp</i> collisions at √s=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 08 (8). 048-.

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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 $\sqrt{s}$ = 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. 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. The 100% branching ratio limits are found to be also applicable to heavy vector-like $X$ production, with charge $+$5/3, that decay into $Wt$.

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: 13 Oct 2023 07:01
DOI: 10.1007/JHEP08(2018)048
Open Access URL: https://doi.org/10.1007/JHEP08(2018)048
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3025635