Fig. 2.

Distributions of the dilepton invariant mass $m_{\ell \ell }$ in the WZ candidate events in 7$\text{TeV}$ (top) and 8$\text{TeV}$ (bottom) data. Points represent data and the shaded histograms represent the WZ signal and the background processes. The contribution from nonprompt leptons, dominated by the $\mathrm{t}\overline{\mathrm{t}}$ and Z+jets production, is obtained from data control samples. The contribution from all other backgrounds, labeled ‘MC background’, as well as the signal contribution are determined from simulation