Fig. 3.

Probability densities of the two most discriminating input variables to the NN: a the invariant mass m(jb) of the untagged jet and the b-tagged jet, and b the absolute value of the pseudorapidity of the untagged jet $|\mathit{\eta }(j)|$. The distributions are shown for the tq signal process, the $W^{+}$ + jets background and the top-quark background in the ${\ell }^{+}$ SR. Events beyond the x-axis range are included in the last bin