"Table 4" of "Search for the production of dark matter in association with top-quark pairs in the single-lepton final state in proton-proton collisions at sqrt(s) = 8 TeV"

Observed exclusion limits in the plane of DM particle mass and interaction scale, with the region below the solid curve excluded at a 90% CL. The background-only expectations are represented by their median (dashed line) and by the 68% and 95% CL bands. A lower bound of the validity of the EFT is indicated by the upper edge of the hatched area. The four curves, corresponding to different g and R values, represent the lower bound on $M_{*}$ for which 50% and 80% of signal events have a pair of DM particles with an invariant mass less than $g\sqrt{M_{*}^{3}/m_{t}}$, where $g = 4\pi$ and $g = 2\pi$ respectively.

在暗物质（Dark Matter）粒子质量与相互作用标度构成的平面内，给出了观测得到的排除极限：实线曲线下方的区域在90%置信水平（CL）下被排除。仅背景假设下的预期结果以其中位数（虚线）以及68%、95%置信水平置信带进行展示。有效场论（Effective Field Theory, EFT）的有效性下限由阴影区域的上边界标注。四条对应不同g与R取值的曲线，代表M_*的下限：当满足该下限时，50%与80%的信号事件分别会产生一对不变质量小于$gsqrt{M_*^3/m_t}$的暗物质粒子，其中g依次取4π与2π。