Table 4.

Detailed list of the contribution from each source of uncertainty to the total uncertainty in the measured values of ${\mathit{\sigma }}_{\text{fid}}(tq)$ and ${\mathit{\sigma }}_{\text{fid}}(\overline{t}q)$. The estimation of the systematic uncertainties has a statistical uncertainty of 0.3%. Uncertainties contributing less than 0.5% are marked with ‘$<0.5$’

Source	$\mathrm{\Delta }{\mathit{\sigma }}_{\text{fid}}(tq)/{\mathit{\sigma }}_{\text{fid}}(tq)$	$\mathrm{\Delta }{\mathit{\sigma }}_{\text{fid}}(\overline{t}q)/{\mathit{\sigma }}_{\text{fid}}(\overline{t}q)$
	(%)	(%)
Data statistics	±1.7	±2.5
Monte Carlo statistics	±1.0	±1.4
Background normalisation	<0.5	<0.5
Background modelling	±1.0	±1.6
Lepton reconstruction	±2.1	±2.5
Jet reconstruction	±1.2	±1.5
Jet energy scale	±3.1	±3.6
Flavour tagging	±1.5	±1.8
$E_{\text{T}}^{\text{miss}}$ modelling	±1.1	±1.6
$b/\overline{b}$ tagging efficiency	±0.9	±0.9
PDF	±1.3	±2.2
tq ($\overline{t}q$) NLO matching	±0.5	<0.5
tq ($\overline{t}q$) parton shower	±1.1	±0.8
tq ($\overline{t}q$) scale variations	±2.0	±1.7
$t\overline{t}$ NLO matching	±2.1	±4.3
$t\overline{t}$ parton shower	±0.8	±2.5
$t\overline{t}$ scale variations	<0.5	<0.5
Luminosity	±1.9	±1.9
Total systematic	±5.6	±7.3
Total (stat.  +  syst.)	±5.8	±7.8