"Table 243" of "Measurements of differential cross-sections in top-quark pair events with a high transverse momentum top quark and limits on beyond the Standard Model contributions to top-quark pair production with the ATLAS detector at $\sqrt{s}=13$ TeV"

Cross-section measurements of top-quark pair production where the hadronically decaying top quark has transverse momentum greater than $355$ GeV and the other top quark decays into $\ell \nu b$ are presented using 139 fb$^{-1}$ of data collected by the ATLAS experiment during proton--proton collisions at the LHC. The fiducial cross-section at $\sqrt{s}=13$ TeV is measured to be $\sigma = 1.267 \pm 0.005 \pm 0.053$ pb, where the uncertainties reflect the limited number of data events and the systematic uncertainties, giving a total uncertainty of $4.2\%$. The cross-section is measured differentially as a function of variables characterising the $t\bar{t}$ system and additional radiation in the events. The results are compared with various Monte Carlo generators, including comparisons where the generators are reweighted to match a parton-level calculation at next-to-next-to-leading order. The reweighting improves the agreement between data and theory. The measured distribution of the top-quark transverse momentum is used to search for new physics in the context of the effective field theory framework. No significant deviation from the Standard Model is observed and limits are set on the Wilson coefficients of the dimension-six operators $O_{tG}$ and $O_{tq}^{(8)}$, where the limits on the latter are the most stringent to date.

利用大型强子对撞机（Large Hadron Collider, LHC）上阿特拉斯（ATLAS）实验采集的139 fb⁻¹质子-质子碰撞数据，本工作报道了强子衰变顶夸克横向动量大于355 GeV、另一顶夸克衰变为ℓνb的顶夸克对产生截面测量结果。
在质心系能量√s=13 TeV下，测得的 fiducial 截面（fiducial cross-section）为σ = 1.267 ± 0.005 ± 0.053 pb，其中不确定度分别来自数据事件统计量有限性以及系统不确定度，总不确定度为4.2%。
本工作针对表征$tar{t}$系统与事件中额外辐射的各类变量，完成了截面的微分测量。
将上述测量结果与多款蒙特卡洛模拟程序（Monte Carlo generators）进行对比，其中包括将模拟程序重加权以匹配部分子层次次次领头阶（next-to-next-to-leading order, NNLO）计算的对比方案。经重加权处理后，数据与理论模型的契合度得到提升。
利用测得的顶夸克横向动量分布，本工作在有效场论（Effective Field Theory, EFT）框架下开展了新物理搜寻。未观测到与标准模型存在显著偏离，并对六维算符$O_{tG}$和$O_{tq}^{(8)}$的威尔逊系数设置了约束，其中针对后者的约束为当前国际上最为严苛的结果。