"Figure 6 ($Z(\ell\ell)$ Control Region)" of "Search for dark matter produced in association with a pair of bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Observed and predicted $\cos\Theta$* distributions in the 2b category, in the $Z(\ell\ell)$ Control Region. The bottom plot shows the ratio of observed and predicted (both prefit and postfit) distributions along with an uncertainty band that includes both the systematic and statistical components.

Z(ℓℓ)控制区（Control Region）中2b类别（category）下观测与预测的cosθ*分布。下方图展示了观测与预测（包括拟合前（prefit）和拟合后（postfit））分布的比值，以及包含系统分量和统计分量的不确定度带（uncertainty band）。