论文标题
同时提取$α_s$和$ m_t $从lhc $ t \ bar {t} $差分发行
Simultaneous extraction of $α_s$ and $m_t$ from LHC $t\bar{t}$ differential distributions
论文作者
论文摘要
我们从ATLAS和CMS实验在8 TEV LHC上执行的Top-Quark Pair生产中的测量值中提取了强耦合$α_s$和Top-Quark Pole质量$ M_T $。首次将差异NNLO理论预测对顶级质量的不同值进行了四个运动学分布的预测：顶级夸克的平均横向动量，其平均速度和对倍数不变的质量和速度。将FastNlo表用于这些分布，可以快速评估不同PDF集的差异理论预测。我们考虑了分别和组合实验的单个差分分布，以获得最佳的理论拟合。我们的最终值为$α_s= 0.1159^{+0.0013} _ { - 0.0014} $和$ m_t = 173.8^{+0.8} _ { - 0.8} $ gev，它们与先前的提取方法使用Top-Quark测量值兼容。在$ m_t $的情况下，我们的价值也与粒子数据组整理的世界平均值兼容。
We present a joint extraction of the strong coupling $α_s$ and the top-quark pole mass $m_t$ from measurements of top-quark pair production performed by the ATLAS and CMS experiments at the 8 TeV LHC. For the first time, differential NNLO theory predictions for different values of the top-quark mass are utilised for four kinematic distributions: the average transverse momentum of the top-quark, its average rapidity and the pair invariant mass and rapidity. The use of fastNLO tables for these distributions allows rapid evaluation of the differential theory predictions for different PDF sets. We consider the single differential distributions from the experiments both separately and in combination in order to obtain the best fit to theory. Our final values are $α_s=0.1159^{+0.0013}_{-0.0014}$ and $m_t=173.8^{+0.8}_{-0.8}$ GeV which are compatible with previous extractions using top-quark measurements. In the case of $m_t$, our value is also compatible with the world average value collated by the Particle Data Group.
