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Measurement of differential cross-sections in t¯t and t¯t+jets production in the lepton+jets final state in pp collisions at √s = 13 TeV using 140 fb−1 of ATLAS data
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Measurement of differential cross-sections in t¯t and t¯t+jets production in the lepton+jets final state in pp collisions at √s = 13 TeV using 140 fb−1 of ATLAS data

ATLAS Collaboration, Diksha Garg and Usha Mallik
Journal of high energy physics : JHEP, Vol.2024, 182
2024
DOI: 10.1007/JHEP08(2024)182
url
https://doi.org/10.1007/JHEP08(2024)182View
Published (Version of record) Open Access

Abstract

Differential cross-sections for top-quark pair production, inclusively and in association with jets, are measured in pp collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 140 fb$^{−1}$. The events are selected with one charged lepton (electron or muon) and at least four jets. The differential cross-sections are presented at particle level as functions of several jet observables, including angular correlations, jet transverse momenta and invariant masses of the jets in the final state, which characterise the kinematics and dynamics of the top-antitop system and the hard QCD radiation in the system with associated jets. The typical precision is 5%–15% for the absolute differential cross-sections and 2%–4% for the normalised differential cross-sections. Next-to-leading-order and next-to-next-to-leading-order QCD predictions are found to provide an adequate description of the rate and shape of the jet-angular observables. The description of the transverse momentum and invariant mass observables is improved when next-to-next-to-leading-order QCD corrections are included.[graphic not available: see fulltext]
 Hadron-Hadron Scattering Jets QCD Top Physics

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