Fig. 3.

Distributions of the BDT discriminants in the 2 jets, 1 b  tag category: (left) ${\mathrm{BDT}}_{t\text{-ch}}$ trained to separate signal from background events; (right) ${\mathrm{BDT}}_{\mathrm{t}\overline{\mathrm{t}}/\text{W}}$ trained to separate $\mathrm{t}\overline{\mathrm{t}}$ from $\text{W}\text{+jets}$ events in a background-dominated category. Events in the muon and electron channels have been summed. The predictions have been scaled to the result of the inclusive ML fit and the hatched band displays the fit uncertainty. The regions of the distributions used in the fits are indicated in the lower panels, which show the ratio of the data to the fit result