Search for pair production of heavy vectorlike quarks decaying into hadronic final states in <i>pp</i> collisions at √<i>s</i>=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 2898 more authors) (2018) Search for pair production of heavy vectorlike quarks decaying into hadronic final states in <i>pp</i> collisions at √<i>s</i>=13 TeV with the ATLAS detector. PHYSICAL REVIEW D, 98 (9). 092005-.

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Abstract

A search is presented for the pair production of heavy vector-like quarks, $T\bar T$ or $B\bar B$, that decay into final states with jets and no reconstructed leptons. Jets in the final state are classified using a deep neural network as arising from hadronically decaying $W/Z$ bosons, Higgs bosons, top quarks, or background. The analysis uses data from the ATLAS experiment corresponding to 36.1 fb$^{-1}$ of proton-proton collisions with a center-of-mass energy of $\sqrt{s} = 13$ TeV delivered by the Large Hadron Collider in 2015 and 2016. No significant deviation from the Standard Model expectation is observed. Results are interpreted assuming the vector-like quarks decay into a Standard Model boson and a third-generation-quark, $T\rightarrow Wb,Ht,Zt$ or $B\rightarrow Wt,Hb,Zb$, for a variety of branching ratios. At 95% confidence level, the observed (expected) lower limit on the vector-like $B$-quark mass for a weak-isospin doublet ($B, Y$) is 950 (890) GeV, and the lower limits on the masses for the pure decays $B\rightarrow Hb$ and $T\rightarrow Ht$, where these results are strongest, are 1010 (970) GeV and 1010 (1010) GeV, respectively.

Item Type: Article
Additional Information: 51 pages in total, author list starts at page 35, 14 figures, 3 tables, submitted to Physical Review D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2017-14/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2018 15:34
Last Modified: 07 Oct 2023 03:15
DOI: 10.1103/PhysRevD.98.092005
Open Access URL: https://doi.org/10.1103/PhysRevD.98.092005
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3026023