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Measurements of fiducial and differential cross-sections of tt̅ production with additional heavy-flavour jets in proton-proton collisions at √(s) = 13 TeV with the ATLAS detector

29 Nov 2018arXiv:1811.12113links table onlyarchive 2025-07-28

ATLAS Collaboration

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This paper presents measurements of tt̅ production in association with additional b-jets in pp collisions at the LHC at a centre-of-mass energy of 13 TeV. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb⁻¹. Fiducial cross-section measurements are performed in the dilepton and lepton-plus-jets tt̅ decay channels. Results are presented at particle level in the form of inclusive cross-sections of tt̅ final states with three and four b-jets as well as differential cross-sections as a function of global event properties and properties of b-jet pairs. The measured inclusive fiducial cross-sections generally exceed the tt̅bb̅ predictions from various next-to-leading-order matrix element calculations matched to a parton shower but are compatible within the total uncertainties. The experimental uncertainties are smaller than the uncertainties in the predictions. Comparisons of state-of-the-art theoretical predictions with the differential measurements are shown and good agreement with data is found for most of them.

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