"Exclusion contour (exp) 3" of "Search for direct top squark pair production in final states with two leptons in $\sqrt{s} = 13$ TeV $pp$ collisions with the ATLAS detector"

Expected exclusion contour as a function of $m_{\tilde{t}_1}$ and $m_{\tilde{\chi}^0_1}$ in the pMSSM model described in the text. Pair production of $\tilde{t}_1$ and $\tilde{b}_1$ are considered. Limits are set for both the positive (red in the figure) and negative (blue in the figure) values of $\mu$. The dashed and dotted grey lines indicate constant values of the $\tilde{b}_1$ mass. The signal models included within the shown contours are excluded at 95% CL. The dashed lines and the shaded band are the expected limit and its $\pm1\sigma$ uncertainty. The thick solid line is the observed limit for the central value of the signal cross-section. The expected and observed limits do not include the effect of the theoretical uncertainties in the signal cross-section.

在本文所述的唯象最小超对称标准模型（pMSSM）中，预期排除轮廓作为$m_{ ilde{t}_1}$与$m_{ ilde{chi}^0_1}$的函数关系。本分析考虑$ ilde{t}_1$（顶超夸克，$ ilde{t}_1$）与$ ilde{b}_1$（底超夸克，$ ilde{b}_1$）的成对产生过程。针对参数$mu$的正值（图中红色区域）与负值（图中蓝色区域）均设置了排除限。灰色虚线与点虚线代表$ ilde{b}_1$质量为固定值的等高线。位于展示轮廓范围内的信号模型，将在95%置信水平（CL）下被排除。虚线与阴影带分别代表预期排除限及其$pm1sigma$的不确定度范围。粗实线对应信号截面中心值的观测排除限。本次给出的预期与观测排除限均未考虑信号截面的理论不确定度带来的影响。