Eur Phys J C Part Fields. 2025;85(9):1001. doi: 10.1140/epjc/s10052-025-14676-y. Epub 2025 Sep 16.
We present a determination of the strong coupling from a global dataset including both fixed-target and collider data from deep-inelastic scattering and a variety of hadronic processes, with a simultaneous determination of parton distribution functions (PDFs) based on the NNPDF4.0 methodology. This determination is performed at NNLO and approximate LO ( LO) perturbative QCD accuracy, including QED corrections and a photon PDF up to NLO accuracy. We extract using two independent methodologies, both of which take into account the cross-correlation between and the PDFs. The two methodologies are validated by closure tests that allow us to detect and remove or correct for several sources of bias, and lead to mutually consistent results. We account for all correlated experimental uncertainties, as well as correlated theoretical uncertainties related to missing higher order perturbative corrections (MHOUs). We study the perturbative convergence of our results and the impact of QED corrections. We assess individual sources of uncertainty, specifically MHOUs and the value of the top quark mass. We provide a detailed appraisal of methodological choices, including the choice of input dataset, the form of solution of evolution equation, the treatment of the experimental covariance matrix, and the details of Monte Carlo data generation. We find at accuracy, consistent with the latest PDG average and with recent lattice results.
我们给出了一种从包含深度非弹性散射的固定靶和对撞机数据以及各种强子过程的全局数据集中确定强耦合常数的方法，同时基于NNPDF4.0方法确定了部分子分布函数（PDFs）。这种确定是在NNLO和近似LO（ LO）微扰QCD精度下进行的，包括QED修正和高达NLO精度的光子PDF。我们使用两种独立的方法提取 ，这两种方法都考虑了 与PDFs之间的交叉相关性。这两种方法通过闭包测试进行了验证，该测试使我们能够检测并消除或校正几种偏差来源，并得出相互一致的结果。我们考虑了所有相关的实验不确定性，以及与缺失高阶微扰修正（MHOUs）相关的理论不确定性。我们研究了结果的微扰收敛性以及QED修正的影响。我们评估了不确定性的各个来源，特别是MHOUs和顶夸克质量的值。我们对方法选择进行了详细评估，包括输入数据集的选择、演化方程解的形式、实验协方差矩阵的处理以及蒙特卡罗数据生成的细节。我们在 精度下得到了 ，与最新的PDG平均值和最近的晶格结果一致。
