Fig. 11.

Predicted values of $R_t={\mathit{\sigma }}_{\text{tot}}(tq)/{\mathit{\sigma }}_{\text{tot}}(\overline{t}q)$ calculated with HatHor  [14] at NLO accuracy in QCD [15] in the 5FS using different NLO PDF sets [79–85] compared to the measured value. The error bars on the predictions include the uncertainty in the renormalisation and factorisation scales and the combined internal PDF and ${\mathit{\alpha }}_{\text{S}}$ uncertainty. The dashed black line indicates the central value of the measured $R_t$ value. The combined statistical and systematic uncertainty of the measurement is shown in green, while the statistical uncertainty is represented by the yellow error band. The uncertainty in the measured $R_t$ value does not include the PDF components for this comparison