{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.159628.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2942410"}},{"@id":"https://doi.org/10.1007/JHEP12(2025)023","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"ATLAS Collaboration"},"creator":{"@type":"Organization","name":"ATLAS Collaboration"},"datePublished":"2025","description":"A measurement of the top-quark pole mass $m_{t}^\\text{pole}$ is presented in $t\\bar{t}$ events with an additional jet, $t\\bar{t}+1\\text{-jet}$, produced in $pp$ collisions at $\\sqrt{s}=13$ TeV. The data sample, recorded with the ATLAS experiment during Run 2 of the LHC, corresponds to an integrated luminosity of $140~\\text{fb}^{-1}$. Events with one electron and one muon of opposite electric charge in the final state are selected to measure the $t\\bar{t}+1\\text{-jet}$ differential cross-section as a function of the inverse of the invariant mass of the $t\\bar{t}+1\\text{-jet}$ system. Iterative Bayesian Unfolding is used to correct the data to enable comparison with fixed-order calculations at next-to-leading-order accuracy in the strong coupling. The process $pp \\to t\\bar{t}j$ ($2 \\rightarrow 3$), where top quarks are taken as stable particles, and the process $pp \\to b\\bar{b}l^+\u03bdl^- \\bar\u03bd j$ ($2 \\to 7$), which includes top-quark decays to the dilepton final state and off-shell effects, are considered. The top-quark mass is extracted using a $\u03c7^2$ fit of the unfolded normalized differential cross-section distribution. The results obtained with the $2 \\to 3$ and $2 \\to 7$ calculations are compatible within theoretical uncertainties, providing an important consistency check. The more precise determination is obtained for the $2 \\to 3 $ measurement: $m_{t}^\\text{pole}=170.7\\pm0.3~(\\text{stat.})\\pm1.4~(\\text{syst.})~\\pm 0.3~(\\text{scale})~\\pm 0.2~(\\text{PDF}\\oplus\u03b1_\\text{S})~\\text{GeV},$ which is in good agreement with other top-quark mass results.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.159628.v1/t1","@type":"Dataset","description":"Unfolded number of events in the 2-to-3measurement (not normalized). 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