Fig. 2: Observed and expected distributions.
From: Observation of electroweak production of two jets and a Z-boson pair
a−d, The mjj distributions in the ℓℓℓℓjj QCD CR (a) and the ℓℓℓℓjj (b) and ℓℓννjj SRs (c), as well as the mZZ distribution in the ℓℓℓℓjj SR (d). The error bands represent the s.d. and include the expected experimental and theoretical systematic uncertainties. The contributions from the QCD and EW production of ZZjj events are scaled by 0.99 and 0.92, respectively, which correspond to the observed normalization factors in the statistical fit to the combined channel (Table 2). ZZ (EW), ZZ (QCD) and ggZZ represent contributions from EW, non-gg QCD and gg QCD ZZjj processes, respectively. WZ represents contribution from WZjj process. All the minor backgrounds are summed together as ‘Others’, and the WWjj and \(t\overline{t}\) processes are referred to as ‘NonRes’. The last bin includes the overflow events. The statistical uncertainties of the data are shown as error bars. The open arrows represent the out-of-range markers. The horizontal bin width is indicated on the vertical axis legend.
