Abstract
A
bstract
Differential and double-differential distributions of kinematic variables of leptons from decays of top-quark pairs (
t
t
¯
) are measured using the full LHC Run 2 data sample collected with the ATLAS detector. The data were collected at a
pp
collision energy of
s
= 13 TeV and correspond to an integrated luminosity of 140 fb
−
1
. The measurements use events containing an oppositely charged
eμ
pair and
b
-tagged jets. The results are compared with predictions from several Monte Carlo generators. While no prediction is found to be consistent with all distributions, a better agreement with measurements of the lepton
p
T
distributions is obtained by reweighting the
t
t
¯
sample so as to reproduce the top-quark
p
T
distribution from an NNLO calculation. The inclusive top-quark pair production cross-section is measured as well, both in a fiducial region and in the full phase-space. The total inclusive cross-section is found to be
σ
t
t
¯
=
829
±
1
stat
±
13
syst
±
8
lumi
±
2
beam
pb
,
where the uncertainties are due to statistics, systematic effects, the integrated luminosity and the beam energy. This is in excellent agreement with the theoretical expectation.
