Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at √s= 7 TeV in the ATLAS detector Aad, G. Aguilar Saavedra, Juan Antonio Atlas Collaboration, / Hadron-Hadron Scattering Top physics Various differential cross-sections are measured in top-quark pair (t¯t) events produced in proton-proton collisions at a centre-of-mass energy of √s = 7TeV at the LHC with the ATLAS detector. These differential cross-sections are presented in a data set corresponding to an integrated luminosity of 4.6 fb−1. The differential cross-sections are presented in terms of kinematic variables, such as momentum, rapidity and invariant mass, of a top-quark proxy referred to as the pseudo-top-quark as well as the pseudo-top-quark pair system. The dependence of the measurement on theoretical models is minimal. The measurements are performed on t¯t events in the lepton+jets channel, requiring exactly one charged lepton and at least four jets with at least two of them tagged as originating from a b-quark. The hadronic and leptonic pseudo-top-quarks are defined via the leptonic or hadronic decay mode of the W boson produced by the top-quark decay in events with a single charged lepton. Differential cross-section measurements of the pseudo-top-quark variables are compared with several Monte Carlo models that implement next-to-leading order or leading-order multi-leg matrix-element calculations. 2024-10-17T10:20:03Z 2024-10-17T10:20:03Z 2015-06-16 journal article Aad, G. & Rodríguez Chala, M. & Atlas Collaboration. J. High Energ. Phys. 2015, 100 (2015). [https://doi.org/10.1007/JHEP06(2015)100] https://hdl.handle.net/10481/96066 10.1007/JHEP06(2015)100 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer