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Measurements of top-quark pair differential cross-sections in the eμeμ channel in pp collisions at √s=13 TeV using the ATLAS detector

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  • The ATLAS collaboration
Article number292
<mark>Journal publication date</mark>8/05/2017
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number5
Number of pages30
Publication StatusPublished
<mark>Original language</mark>English


This article presents measurements of tt ¯ differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb−1 of proton–proton data at a centre-of-mass energy of √s = 13 TeV recorded by the ATLAS experiment at the LHC in 2015. Differential crosssections are measured as a function of the transverse momentum and absolute rapidity of the top quark, and of the transverse momentum, absolute rapidity and invariant mass of the tt ¯system. The tt ¯ events are selected by requiring one electron and one muon of opposite electric charge, and at least two jets, one of which must be tagged as containing a b-hadron. The measured differential cross-sections are compared to predictions of next-to-leading order generators matched to parton showers and the measurements are found to be consistent with all models within the experimental uncertainties with the exception of the Powheg-Box + Herwig++ predictions, which differ significantly from the data in both the transverse momentum of the top quark and the mass of the tt ¯ system.