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

Aaboud, M. and Aad, G. and Abbott, B. and Abdinov, O. and Abeloos, B. and Abhayasinghe, D.K. and Abidi, S.H. and AbouZeid, O.S. and Abraham, N.L. and Abramowicz, H. and Abreu, H. and Abulaiti, Y. and Acharya, B.S. and Adachi, S. and Adam, L. and Adamczyk, L. and Adelman, J. and Adersberger, M. and Adiguzel, A. and Adye, T. and Affolder, A.A. and Afik, Y. and Agheorghiesei, C. and Aguilar-Saavedra, J.A. and Ahmadov, F. and Aielli, G. and Akatsuka, S. and Åkesson, T.P.A. and Akilli, E. and Akimov, A.V. and Tóth, József (2019) 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 (4). ISSN 1126-6708

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Abstract

This paper presents measurements of t ¯t 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 t ¯t decay channels. Results are presented at particle level in the form of inclusive cross-sections of t ¯t 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 ¯tb ¯b 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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