%0 Electronic Article
%T Search for pair-production of vector-like quarks in pp collision events at √s=13 TeV with at least one leptonically decaying Z boson and a third-generation quark with the ATLAS detector
%N arXiv:2210.15413
%M PUBDB-2022-06839
%M arXiv:2210.15413
%M CERN-EP-2021-207
%D 2022
%Z 26 pages in total, 8 figures, 4 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-58
%X A search for the pair-production of vector-like quarks optimized for decays into a Z boson and a third-generation Standard Model quark is presented, using the full Run 2 dataset corresponding to 139 fb<sup>−1</sup> of pp collisions at √s=13 TeV, collected in 2015-2018 with the ATLAS detector at the Large Hadron Collider. The targeted final state is characterized by the presence of a Z boson with high transverse momentum, reconstructed from a pair of same-flavour leptons with opposite-sign charges, as well as by the presence of b-tagged jets and high-transverse-momentum large-radius jets reconstructed from calibrated smaller-radius jets. Events with exactly two or at least three leptons are used, which are further categorized by the presence of boosted W, Z, and Higgs bosons and top quarks. The categorization is performed using a neural-network-based boosted object tagger to enhance the sensitivity to signal relative to the background. No significant excess above the background expectation is observed and exclusion limits at 95
%K p p: scattering (INSPIRE)
%K p p: colliding beams (INSPIRE)
%K family: 3 (INSPIRE)
%K Z0: transverse momentum (INSPIRE)
%K transverse momentum: high (INSPIRE)
%K quark: postulated particle (INSPIRE)
%K quark: vector particle (INSPIRE)
%K quark: pair production (INSPIRE)
%K quark: decay modes (INSPIRE)
%K Z0: leptonic decay (INSPIRE)
%K jet: bottom (INSPIRE)
%K bottom: particle identification (INSPIRE)
%K top: particle identification (INSPIRE)
%K jet: transverse momentum: high (INSPIRE)
%K branching ratio (INSPIRE)
%K final state: ((n)jet dilepton) (INSPIRE)
%K final state: ((n)jet 3lepton) (INSPIRE)
%K background (INSPIRE)
%K ATLAS (INSPIRE)
%K calibration (INSPIRE)
%K sensitivity (INSPIRE)
%K CERN LHC Coll (INSPIRE)
%K Higgs particle (INSPIRE)
%K singlet (INSPIRE)
%K doublet (INSPIRE)
%K quark: mass: lower limit (INSPIRE)
%K neural network (INSPIRE)
%K data analysis method (INSPIRE)
%K experimental results (INSPIRE)
%K quark --> Z0 top (INSPIRE)
%K quark --> Z0 bottom (INSPIRE)
%K 13000 GeV-cms (INSPIRE)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.3204/PUBDB-2022-06839
%U https://bib-pubdb1.desy.de/record/485773