{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.145074.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2627201"}},{"@id":"https://doi.org/10.1103/PhysRevD.108.032019","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2023","description":"A search for flavor-changing neutral-current couplings between a top quark, an up or charm quark and a $Z$ boson is presented, using proton-proton collision data at $\\sqrt{s} = 13$ TeV collected by the ATLAS detector at the Large Hadron Collider. The analyzed dataset corresponds to an integrated luminosity of 139 fb$^{-1}$. The search targets both single-top-quark events produced as $gq\\rightarrow tZ$ (with $q = u, c$) and top-quark-pair events, with one top quark decaying through the $t \\rightarrow Zq$ channel. The analysis considers events with three leptons (electrons or muons), a $b$-tagged jet, possible additional jets, and missing transverse momentum. The data are found to be consistent with the background-only hypothesis and 95% confidence-level limits on the $t \\rightarrow Zq$ branching ratios are set, assuming only tensor operators of the Standard Model effective field theory framework contribute to the $tZq$ vertices. These are $6.2 \\times 10^{-5}$ ($13\\times 10^{-5}$) for $t\\rightarrow Zu$ ($t\\rightarrow Zc$) for a left-handed $tZq$ coupling, and $6.6 \\times 10^{-5}$ ($12\\times 10^{-5}$) in the case of a right-handed coupling. These results are interpreted as 95% CL upper limits on the strength of corresponding couplings, yielding limits for $|C_{uW}^{(13)*}|$ and $|C_{uB}^{(13)*}|$ ($|C_{uW}^{(31)}|$ and $|C_{uB}^{(31)}|$) of 0.15 (0.16), and limits for $|C_{uW}^{(23)*}|$ and $|C_{uB}^{(23)*}|$ ($|C_{uW}^{(32)}|$ and $|C_{uB}^{(32)}|$) of 0.22 (0.21), assuming a new-physics energy scale $\\Lambda_\\text{NP}$ of 1 TeV.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.145074.v1/t1","@type":"Dataset","description":"Summary of the signal strength $\\mu$ parameters obtained from the fits to extract LH and RH results for the FCNC...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.145074.v1/t2","@type":"Dataset","description":"Observed and expected 95% CL limits on the FCNC $t\\rightarrow Zq$ branching ratios and the effective coupling strengths for different...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.145074.v1/t3","@type":"Dataset","description":"Comparison between data and background prediction before the fit (Pre-Fit) for the mass of the SM top-quark candidate in SR1....","name":"Figure 02a"},{"@id":"https://doi.org/10.17182/hepdata.145074.v1/t4","@type":"Dataset","description":"Comparison between data and background prediction before the fit (Pre-Fit) for the mass of the FCNC top-quark candidate in SR1....","name":"Figure 02b"},{"@id":"https://doi.org/10.17182/hepdata.145074.v1/t5","@type":"Dataset","description":"Comparison between data and background prediction before the fit (Pre-Fit) for the mass of the SM top-quark candidate in SR2....","name":"Figure 02c"},{"@id":"https://doi.org/10.17182/hepdata.145074.v1/t6","@type":"Dataset","description":"Comparison between data and background prediction before the fit (Pre-Fit) for the transverse momentum of the Z boson candidate in...","name":"Figure 02d"},{"@id":"https://doi.org/10.17182/hepdata.145074.v1/t7","@type":"Dataset","description":"Comparison between data and background prediction after the fit to data (Post-Fit) for the FCNC tZu LH coupling extraction. 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