"Figure 3a" of "Search for direct top squark pair production in events with a Higgs or $Z$ boson, and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector"

Jet multiplicity distributions in control regions CR$^{1\ell 4b}_{t\bar{t},A}$, after normalising the $t\bar{t}$ background process via the simultaneous fit described in Section 5. The $t\bar{t}$ background normalisation is constrained to the data observation for jet multiplicity values above the requirements shown in Table 6. The contributions from all SM backgrounds are shown as a histogram stack; the bands represent the total uncertainty. The "Others" category contains the contributions from $t\bar{t} h$, $t\bar{t} WW$, $t\bar{t} t$, $t\bar{t} t\bar{t}$, $Wh$, and $Zh$ production. The last bin in each figure contains the overflow. The lower panels show the ratio of the observed data to the total SM background prediction, with the bands representing the total uncertainty in the background prediction.

本数据集为通过第5节所述同时拟合完成顶反顶（$tar{t}$）背景过程归一化后，控制区CR$^{1ell 4b}_{tar{t},A}$内的喷注多重数分布。对于喷注多重数高于表6所示选择要求的区间，顶反顶背景的归一化参数被约束至实验观测数据。所有标准模型（Standard Model, SM）背景的贡献以直方图堆叠形式展示，误差带代表总不确定度。'其他'类别包含顶反顶希格斯（$tar{t}h$）、顶反顶W玻色子对（$tar{t}WW$）、三顶夸克（$tar{t}t$）、四顶夸克对（$tar{t}tar{t}$）、W希格斯（$Wh$）以及Z希格斯（$Zh$）的产生过程贡献。每张图的最后一个分箱包含溢出事件。下方面板展示观测数据与总标准模型背景预言值的比值，误差带代表背景预言中的总不确定度。