Article open access publication

Measurements of inclusive and differential fiducial cross-sections of tt¯ production with additional heavy-flavour jets in proton-proton collisions at s = 13 TeV with the ATLAS detector

Journal of High Energy Physics, Springer Nature, ISSN 1126-6708

Volume 2019, 4, 2019

DOI:10.1007/jhep04(2019)046, Dimensions: pub.1113358392,

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  1. (1) Mohamed I University, grid.410890.4
  2. (2) Center for Particle Physics of Marseilles, grid.470046.1
  3. (3) University of Oklahoma, grid.266900.b
  4. (4) Institute of Physics, grid.435347.2
  5. (5) Laboratoire de l'Accélérateur Linéaire, grid.462450.1
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Description

This 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.

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