Fig. 6.

The distribution of $m_{\ell \ell jj}$ used in the likelihood fit for the $H\to ZZ\to {\ell }^{+}{\ell }^{-}q\overline{q}$ search in the VBF channel. The dashed line shows the total background used as input to the fit. The simulated signal is normalized to a cross-section corresponding to 30 times the observed limit given in Sect. 11. The contribution labelled as ‘Top’ includes both the $t\overline{t}$ and single-top processes. The bottom pane shows the ratio of the observed data to the predicted background