Fig. 5.

The jet mass distribution for events that pass (left) and fail (right) the ${\tau }_{21}^{\mathrm{DDT}}\le 0.43$ selection in the $\text{t}\overline{\text{t}}$ control sample. The results of the separate fits to data and to simulation are shown by the dash-dotted blue and solid red lines, respectively. The background components of the fits are shown as dashed and dash-dotted lines. The fit to 2016 data is shown in the upper panels and the fit to 2017 data in the lower panels. The associated uncertainties are shown in Table 1 and discussed further in Sect. 4.4