"Table 03: Ranking for the 1L/2LOS channel" of "Measurement of the $t\bar{t}t\bar{t}$ production cross section in $pp$ collisions at $\sqrt{s}$=13 TeV with the ATLAS detector"

Ranking of the nuisance parameters included in the fit according to their impact on the signal strength $\mu$. The impact of each nuisance parameter, $\Delta\mu$, is computed by comparing the nominal best-fit value of $\mu$ with the result of the fit when fixing the nuisance parameter to its best-fit value, $\hat{\theta}$, shifted by its pre-fit (post-fit) uncertainties $\pm \Delta\theta$ ($\pm \Delta\hat{\theta}$).

本数据集为依据对信号强度$mu$的影响程度，对拟合过程中纳入的干扰参数（nuisance parameters）所做的排序。单个干扰参数的影响量$Deltamu$的计算方式为：将$mu$的名义最优拟合值，与将该干扰参数固定至其最优拟合值$hat{ heta}$、并施加由其拟合前（拟合后）不确定度$pmDelta heta$（$pmDeltahat{ heta}$）带来的偏移后的拟合结果进行对比，由此得到该干扰参数的影响量$Deltamu$。