Aaboud, M.Aad, G.Abbott, B.Abdinov, O.Abeloos, B.Abhayasinghe, D. K.Abidi, S. H.Izen, Joseph M.Meirose, BernhardReeves, KendallATLAS Collaboration2019-10-312019-10-312019-04-041126-6708https://hdl.handle.net/10735.1/7062This paper presents measurements of tt¯ 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 tt¯ decay channels. Results are presented at particle level in the form of inclusive cross-sections of tt¯ 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 tt¯ bb¯ 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. ©2019 The Author(s).enCC BY 4.0 (Attribution)©2019 CERN, for the ATLAS Collaborationhttp://creativecommons.org/licenses/by/4.0/Hadrons--ScatteringQuarksJets (Nuclear physics)Large Hadron Collider (France and Switzerland)Leptons (Nuclear physics)articleAaboud, M., G. Aad, B. Abbott, O. Abdinov, et al. 2019. "Measurements of inclusive and differential fiducial cross-sections of tt̅ production with additional heavy-flavour jets in proton-proton collisions at √s = 13 TeV with the ATLAS detector." Journal of High Energy Physics 2019(4): art. 046, doi: 10.1007/JHEP04(2019)04620194