Abstract
A
bstract
Inclusive and differential measurements of the top–antitop (
t
t
¯
) charge asymmetry
A
C
t
t
¯
and the leptonic asymmetry
A
C
ℓ
ℓ
¯
are presented in proton–proton collisions at
s
= 13 TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb
−
1
, combines data in the single-lepton and dilepton channels, and employs reconstruction techniques adapted to both the resolved and boosted topologies. A Bayesian unfolding procedure is performed to correct for detector resolution and acceptance effects. The combined inclusive
t
t
¯
charge asymmetry is measured to be
A
C
t
t
¯
= 0
.
0068 ± 0
.
0015, which differs from zero by 4.7 standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the
t
t
¯
system. Both the inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum chromodynamics perturbation theory with next-to-leading-order electroweak corrections. The measurements are interpreted in the framework of the Standard Model effective field theory, placing competitive bounds on several Wilson coefficients.