Mullier, GeoffreyGeoffreyMullierHaug, SigveSigveHaug0000-0003-0442-3361Weber, MichaelMichaelWeber0000-0002-2770-9031Meloni, FedericoFedericoMeloniCervelli, AlbertoAlbertoCervelliBeck, Hans PeterHans PeterBeck0000-0001-7212-1096Stucci, StefaniaStefaniaStucciEreditato, AntonioAntonioEreditato2024-10-252024-10-252016https://boris-portal.unibe.ch/handle/20.500.12422/152728Measurements of the top--antitop quark pair production charge asymmetry in the dilepton channel, characterized by two high-pT leptons (electrons or muons), are presented using data corresponding to an integrated luminosity of 20.3 fb⁻¹ from pp collisions at a center-of-mass energy of √s=8 TeV collected with the ATLAS detector at the Large Hadron Collider at CERN. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of the tt system are performed both in the full phase space and in a fiducial phase space closely matching the detector acceptance. Two observables are studied: AℓℓC based on the selected leptons and AttC based on the reconstructed tt final state. The inclusive asymmetries are measured in the full phase space to be AℓℓC =0.008±0.006 and AttC =0.021±0.016 , which are in agreement with the Standard Model predictions of AℓℓC =0.0064±0.0003 and AttC =0.0111±0.0004 .en500 - Science::530 - Physics500 - Science::510 - Mathematicsarticle10.7892/boris.9995910.1103/PhysRevD.94.032006