Fig. 4.

Distributions of $M_{\text{T2}}(\ell \ell )$ (left), $M_{\text{T2}}(\text{b}\ell \text{b}\ell )$ (middle), and $\mathcal{S}$ (right) for all lepton flavors for the preselection defined in Table 2. Additionally, $M_{\text{T2}}(\ell \ell )>100\text{GeV}$ is required for the $M_{\text{T2}}(\text{b}\ell \text{b}\ell )$ and $\mathcal{S}$ distributions. The last bin in each distribution includes the overflow events. The lower panel gives the ratio between the observation and the predicted SM backgrounds and the relative uncertainty in the SM background prediction is shown as a hatched band