Search for Single-Production of Vector-Like Quarks Decaying into Wb in the Fully Hadronic Final State in Pp Collisions at S = 13 TeV with the ATLAS Detector

Aad, G.Aakvaag, E.Abbott, B.Abdelhameed, S.Abeling, K.Abicht, N.J.Abidi, S.H.2025-11-102025-11-1020251029-8479https://doi.org/10.1007/JHEP02(2025)075https://hdl.handle.net/20.500.11851/12787A search for T and Y vector-like quarks produced in proton-proton collisions at a centre-of-mass energy of 13 TeV and decaying into Wb in the fully hadronic final state is presented. The search uses 139 fb−1 of data collected by the ATLAS detector at the LHC from 2015 to 2018. The final state is characterised by a hadronically decaying W boson with large Lorentz boost and a b-tagged jet, which are used to reconstruct the invariant mass of the vector-like quark candidate. The main background is QCD multijet production, which is estimated using a data-driven method. Upon finding no significant excess in data, mass limits at 95% confidence level are obtained as a function of the global coupling parameter, κ. The observed lower limits on the masses of Y quarks with κ = 0.5 and κ = 0.7 are 2.0 TeV and 2.4 TeV, respectively. For T quarks, the observed mass limits are 1.4 TeV for κ = 0.5 and 1.9 TeV for κ = 0.7. © 2025 Elsevier B.V., All rights reserved.eninfo:eu-repo/semantics/openAccessBeyond Standard ModelHadron-Hadron ScatteringProton-Proton ScatteringVector-Like QuarksSearch for Single-Production of Vector-Like Quarks Decaying into Wb in the Fully Hadronic Final State in Pp Collisions at S = 13 TeV with the ATLAS DetectorArticle2-s2.0-10501246640810.1007/JHEP02(2025)075