"Figure 13 right" of "Search for long-lived particles decaying to a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Comparison of the number of events observed in 2018 data in the TMS-TMS dimuon category with the expected number of background events, as a function of the smaller of the two $d_0 / \sigma_{d_0}$ values in the TMS-TMS dimuon. The black points with crosses show the number of observed events; the green and yellow components of the stacked histograms represent the estimated numbers of DY and QCD events, respectively. The last bin includes events in the overflow. The uncertainties in the total expected background (shaded area) are statistical only. Signal contributions expected from simulated $H \rightarrow Z_D Z_D$ with $m_{Z_D}$ of 20 and 50 GeV are shown in red and blue, respectively. Their yields are set to the corresponding combined median expected exclusion limits at 95% CL, scaled up as indicated in the legend to improve visibility.

本数据集针对TMS-TMS双缪子道，对比了2018年采集数据中观测到的事件数目与预期背景事件数目，其分布以TMS-TMS双缪子系统内两个$d_0/sigma_{d_0}$值中的较小值作为横坐标变量。带叉号的黑色散点代表观测到的事件数目；堆叠直方图的绿色与黄色分量分别对应德雷尔-杨（DY）与量子色动力学（QCD）过程的估算事件数。最后一个分箱包含溢出事件。总预期背景的不确定性（阴影区域）仅包含统计不确定性。由模拟得到的$H
ightarrow Z_D Z_D$信号贡献，当其$Z_D$玻色子质量$m_{Z_D}$分别为20 GeV与50 GeV时，分别以红色与蓝色曲线展示。其产额被设置为95%置信水平（Confidence Level, CL）下对应的联合中位预期排除极限，并按图例标注的比例进行缩放以提升可视化效果。