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000485773 0247_ $$2arXiv$$aarXiv:2210.15413
000485773 0247_ $$2datacite_doi$$a10.3204/PUBDB-2022-06839
000485773 037__ $$aPUBDB-2022-06839
000485773 041__ $$aEnglish
000485773 088__ $$2arXiv$$aarXiv:2210.15413
000485773 088__ $$2CERN$$aCERN-EP-2021-207
000485773 1001_ $$0P:(DE-HGF)0$$aATLAS Collaboration$$b0$$eCollaboration author
000485773 245__ $$aSearch for pair-production of vector-like quarks in $pp$ collision events at $\sqrt{s}=13$ TeV with at least one leptonically decaying $Z$ boson and a third-generation quark with the ATLAS detector
000485773 260__ $$c2022
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000485773 500__ $$a26 pages in total, 8 figures, 4 tables, submitted to PLB. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2018-58
000485773 520__ $$aA 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$^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ 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% confidence level are set on the masses of the vector-like partners $T$ and $B$ of the top and bottom quarks, respectively. In the singlet model, the limits allow $m_T > 1.27$ TeV and $m_B > 1.20$ TeV. In the doublet model, allowed masses are $m_T > 1.46$ TeV and $m_B >1.32$ TeV. In the case of 100% branching ratio for $T\rightarrow Zt$ and 100% branching ratio for $B\rightarrow Zb$, the limits allow $m_T > 1.60$ TeV and $m_B > 1.42$ TeV, respectively.
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000485773 650_7 $$2INSPIRE$$ap p: colliding beams
000485773 650_7 $$2INSPIRE$$afamily: 3
000485773 650_7 $$2INSPIRE$$aZ0: transverse momentum
000485773 650_7 $$2INSPIRE$$atransverse momentum: high
000485773 650_7 $$2INSPIRE$$aquark: postulated particle
000485773 650_7 $$2INSPIRE$$aquark: vector particle
000485773 650_7 $$2INSPIRE$$aquark: pair production
000485773 650_7 $$2INSPIRE$$aquark: decay modes
000485773 650_7 $$2INSPIRE$$aZ0: leptonic decay
000485773 650_7 $$2INSPIRE$$ajet: bottom
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000485773 650_7 $$2INSPIRE$$atop: particle identification
000485773 650_7 $$2INSPIRE$$ajet: transverse momentum: high
000485773 650_7 $$2INSPIRE$$abranching ratio
000485773 650_7 $$2INSPIRE$$afinal state: ((n)jet dilepton)
000485773 650_7 $$2INSPIRE$$afinal state: ((n)jet 3lepton)
000485773 650_7 $$2INSPIRE$$abackground
000485773 650_7 $$2INSPIRE$$aATLAS
000485773 650_7 $$2INSPIRE$$acalibration
000485773 650_7 $$2INSPIRE$$asensitivity
000485773 650_7 $$2INSPIRE$$aCERN LHC Coll
000485773 650_7 $$2INSPIRE$$aHiggs particle
000485773 650_7 $$2INSPIRE$$asinglet
000485773 650_7 $$2INSPIRE$$adoublet
000485773 650_7 $$2INSPIRE$$aquark: mass: lower limit
000485773 650_7 $$2INSPIRE$$aneural network
000485773 650_7 $$2INSPIRE$$adata analysis method
000485773 650_7 $$2INSPIRE$$aexperimental results
000485773 650_7 $$2INSPIRE$$aquark --> Z0 top
000485773 650_7 $$2INSPIRE$$aquark --> Z0 bottom
000485773 650_7 $$2INSPIRE$$a13000 GeV-cms
000485773 693__ $$0EXP:(DE-H253)LHC-Exp-ATLAS-20150101$$1EXP:(DE-588)4398783-7$$5EXP:(DE-H253)LHC-Exp-ATLAS-20150101$$aLHC$$eLHC: ATLAS$$x0
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000485773 9141_ $$y2022
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