"Table 26" 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.

本数据集基于质心系能量√s=13太电子伏特（TeV）的质子-质子对撞数据，测量了高度洛伦兹增强的成对产生顶夸克的微分截面，测量结果以顶夸克与顶夸克-反顶夸克（tar{t}）系统的运动学可观测量为函数形式呈现。所用数据采集于2015年与2016年，由欧洲核子研究中心（CERN）大型强子对撞机（Large Hadron Collider）上的ATLAS探测器获取，对应积分亮度为36.1反费米母（fb⁻¹）。本分析选用末态包含两个大半径喷注（large-radius jets）的事例：其中一个喷注的横向动量p_T大于500吉电子伏特（GeV），另一个喷注的横向动量p_T大于350吉电子伏特（GeV）。研究团队借助喷注子结构信息，以及与b标记喷注（b-tagged jet）的关联，将顶夸克候选事例与多喷注本底区分开来。针对探测器效应，研究团队将测量得到的能谱校正至粒子层次 fiducial相空间（fiducial phase space）与部分子层次受限相空间，并通过计算卡方（χ²）值，将校正后结果与多款蒙特卡洛模拟（Monte Carlo simulation）预言进行对比。在该fiducial相空间区域内，顶夸克-反顶夸克对产生截面的测量结果为292 ± 7（统计误差） ± 76（系统误差）反费米母（fb），与理论预言值384 ± 36 fb可供对比。