"Figure 12b" of "Search for nonresonant pair production of Higgs bosons in the $b\bar{b}b\bar{b}$ final state in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector"

The expected and observed profile likelihood ratio scans for the κ_2V coupling modifier, shown by the solid black line, using the coupling modifier as the POIs.
The value of κ_λ is fixed to 1.
The dashed blue line shows the expected profile likelihood ratio, as obtained using a fit to the data with the background-only hypothesis.
The pink line indicates the 2σ exclusion boundary.

以κ_2V耦合修正因子作为兴趣参数（Parameters of Interest，POIs）时，其预期与观测轮廓似然比扫描由黑色实线表示。κ_λ的值固定为1。蓝色虚线显示的是背景仅假设下对数据拟合得到的预期轮廓似然比。粉色线表示2σ排除边界。