"Figure 12 bottom center" 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, in representative $m_{\mu \mu}$ intervals in the $10 < min(d_0 / \sigma_{d_0}) \leq 20$ bin. 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. The legend also includes the total number of observed events as well as the number of expected background events obtained inclusively, by applying the background evaluation method to the events in all $m_{Z_D}$ and min($d_0 / \sigma_{d_0}$) intervals combined.

本工作对比了2018年TMS-TMS双μ子（dimuon）类别中观测到的事件数，与10 < min(d₀/σ_{d₀}) ≤20 分箱内代表性μμ不变质量区间内的预期背景事件数。带交叉标记的黑色点代表观测事件数；堆叠直方图的绿色与黄色分量分别代表Drell-Yan（DY）过程与量子色动力学（QCD）过程的预估事件数。最后一个分箱包含溢出区间内的事件。总预期背景的不确定性（阴影区域）仅为统计不确定性。通过模拟得到的、Z_D质量（m_{Z_D}）分别为20 GeV与50 GeV的H→Z_D Z_D信号贡献，分别以红色与蓝色展示。其产额被设置为对应95%置信度下的联合中位预期排除限，并按图例标注的比例进行缩放以提升可视性。图例同时包含了总观测事件数，以及通过对所有m_{Z_D}和min(d₀/σ_{d₀})区间内的事件统一应用背景评估方法得到的全域预期背景事件数。