"Table 9 Down" 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"

Observed and expected numbers of events in the three 1$\ell$4$b$ signal regions. The nominal predictions from MC simulation are given for comparison for those backgrounds, $t\bar{t}$, are normalised to data in dedicated control regions. For SR$^{1\ell 4b}_A$, SR$^{1\ell 4b}_B$ and SR$^{1\ell 4b}_C$, the "Others" category contains the contributions from $t\bar{t} WW$, $t\bar{t} t$, $t\bar{t} t\bar{t}$, $tZ$, and $tWZ$ production. Combined statistical and systematic uncertainties are given. Signal model-independent 95% CL upper limits on the visible BSM cross-section ($\sigma_{\mathrm{vis}}$), the visible number of signal events ($S^{95}_{\rm obs}$), the number of signal events ($S^{95}_{\rm exp}$) given the expected number of background events (and $\pm1\sigma$ variations of the expected background), and the discovery $p$-value ($p(s = 0)$), all calculated with pseudo-experiments, are also shown for each signal region.三个1轻子4b夸克（1ℓ4b）信号区中观测到的与预期的事例数。针对$tar{t}$这类本底，给出了蒙特卡洛（Monte Carlo, MC）模拟的标称预言值用于对比，并在专属控制区中将其归一化至实验数据。对于信号区（Signal Region, SR）$^{1ell4b}_A$、SR$^{1ell4b}_B$与SR$^{1ell4b}_C$，“其他”类别包含了$tar{t}WW$、$tar{t}t$、$tar{t}tar{t}$、$tZ$以及$tWZ$产生道的贡献。同时给出了统计与系统误差的合并不确定度。针对每个信号区，还展示了通过伪实验计算得到的、与信号模型无关的超出标准模型（Beyond the Standard Model, BSM）可见截面$sigma_{mathrm{vis}}$的95%置信度（Confidence Level, CL）上限、观测到的95%置信度下可见信号事例数$S^{95}_{ m obs}$、以预期本底事例数（及预期本底的$pm1sigma$涨落）为基准的95%置信度下预期信号事例数$S^{95}_{ m exp}$，以及发现显著性p值$p(s=0)$。