"Table 28" of "Measurements of $t\bar{t}$ differential cross-sections of highly boosted top quarks decaying to all-hadronic final states in $pp$ collisions at $\sqrt{s}=13\,$ TeV using the ATLAS detector"

Measurements are made of differential cross-sections of highly boosted pair-produced top quarks as a function of top-quark and $t\bar{t}$ system kinematic observables using proton--proton collisions at a center-of-mass energy of $\sqrt{s} = 13$ TeV. The data set corresponds to an integrated luminosity of $36.1$ fb$^{-1}$, recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Events with two large-radius jets in the final state, one with transverse momentum $p_{\rm T} > 500$ GeV and a second with $p_{\rm T} > 350$ GeV, are used for the measurement. The top-quark candidates are separated from the multijet background using jet substructure information and association with a $b$-tagged jet. The measured spectra are corrected for detector effects to a particle-level fiducial phase space and a parton-level limited phase space, and are compared to several Monte Carlo simulations by means of calculated $\chi^2$ values. The cross-section for $t\bar{t}$ production in the fiducial phase-space region is $292 \pm 7 \rm{(stat)} \pm 76 \rm{(syst)}$ fb, to be compared to the theoretical prediction of $384 \pm 36$ fb.

本数据集基于欧洲核子研究中心（CERN）大型强子对撞机（Large Hadron Collider, LHC）上的ATLAS探测器，在2015年与2016年间采集的质心系能量$sqrt{s}=13 mathrm{TeV}$的质子-质子碰撞数据，测量了高快度增强的成对产生顶夸克（top quark）的微分截面随顶夸克及$tar{t}$（顶反顶夸克对）系统运动学可观测量的分布，对应积分亮度为$36.1 mathrm{fb}^{-1}$。本次分析选取末态包含两个大半径喷注的事件：其中一个喷注的横向动量$p_mathrm{T} > 500 mathrm{GeV}$，另一个喷注的$p_mathrm{T} > 350 mathrm{GeV}$。通过喷注子结构信息以及与b标记喷注的关联，将顶夸克候选事件与多喷注本底加以区分。针对探测器效应完成校正后，将测量得到的能谱映射至粒子级 fiducial 相空间（fiducial phase space）与部分子级受限相空间，并通过计算$chi^2$统计量与多款蒙特卡洛（Monte Carlo, MC）模拟结果进行对比。在该fiducial相空间区域内，$tar{t}$产生截面的测量结果为$292 pm 7 ( ext{统计}) pm 76 ( ext{系统})$ fb，与理论预言值$384 pm 36$ fb可供对比。