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



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2846 more authors) (2017) Search for pair production of heavy vector-like quarks decaying to high-<i>p</i><sub>T</sub> <i>W</i> bosons and <i>b</i> quarks in the lepton-plus-jets final state in pp collisions at √<i>s</i>=13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 10 (10). 141-.

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Abstract

A search is presented for the pair production of heavy vector-like $T$ and $B$ 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 $\sqrt{s}$ = 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, 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.

Item Type: Article
Additional Information: 41 pages in total, author list starting page 25, 6 figures, 2 tables, published version, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-14/
Uncontrolled Keywords: Exotics, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 18 Dec 2017 09:14
Last Modified: 07 Oct 2023 06:18
DOI: 10.1007/JHEP10(2017)141
Open Access URL: http://doi.org/10.1007/JHEP10(2017)141
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3014281