Fig. 5.

Four-lepton mass distribution in three final states: $4\mathrm{e}$ upper), $4{\mathrm{\mu }}_{}^{}$ (center), and $2\mathrm{e}2{\mathrm{\mu }}_{}^{}$ (lower). Points with error bars represent the data and stacked histograms represent the expected distributions for the signal and background processes. The SM Higgs boson signal with $m_{\mathrm{H}}=125\text{GeV}$, denoted as $\mathrm{H}(125)$, the $\mathrm{Z}\mathrm{Z}$ and rare electroweak backgrounds are normalized to the SM expectation, the $\mathrm{Z}$+X background to the estimation from data