"Table 19" 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（ATLAS Detector）于2015年与2016年间采集的质心系能量$sqrt{s}=13$ TeV的质子-质子对撞数据，测量了高动量增强成对产生顶夸克的微分截面，该截面以顶夸克与顶反顶夸克（$tar{t}$）系统的运动学可观测量为自变量。该数据集对应的积分亮度为36.1反费米伯（fb⁻¹）。本次测量选取末态包含两个大半径喷注（large-radius jet）的事例：其中一个喷注的横向动量（transverse momentum, $p_T$）大于500吉电子伏特（GeV），另一个大于350吉电子伏特。通过喷注子结构（jet substructure）信息以及与b标记喷注（b-tagged jet）的关联，将顶夸克候选事例从多喷注本底中分离出来。针对探测器效应，将测量得到的能谱修正至粒子级 fiducial相空间（fiducial phase space）与部分子级受限相空间，并通过计算卡方（$chi^2$）值与多款蒙特卡洛（Monte Carlo）模拟结果进行比对。在该fiducial相空间区域内，顶反顶夸克对产生截面为$292 pm 7
m{(stat)} pm 76
m{(syst)}$ fb，可与理论预言值$384 pm 36$ fb进行比对。