Çetin, Serkant Ali2021-01-152021-01-152019-04-041029-8479https://hdl.handle.net/11411/3108https://doi.org/10.1007/JHEP04(2019)046This paper presents measurements of tt (t) over bar 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 (t) over bar 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 t (t) over barb (b) over bar 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.eninfo:eu-repo/semantics/openAccessHadron-Hadron scattering (experiments)Heavy quark productionArticle2-s2.0-8506425132910.1007/JHEP04(2019)046Q1WOS:000464729300001