Title: Proton and neutron electromagnetic radii and magnetic moments from lattice QCD Show Chinese title

Title: 质子和中子的电磁半径和磁矩来自格点QCD

Abstract: We present results for the electromagnetic form factors of the proton and neutron computed on the $(2 + 1)$-flavor Coordinated Lattice Simulations (CLS) ensembles including both quark-connected and -disconnected contributions. The $Q^2$-, pion-mass, lattice-spacing, and finite-volume dependence of our form factor data is fitted simultaneously to the expressions resulting from covariant chiral perturbation theory including vector mesons amended by models for lattice artefacts. From these fits, we determine the electric and magnetic radii and the magnetic moments of the proton and neutron, as well as the Zemach radius of the proton. To assess the influence of systematic effects, we average over various cuts in the pion mass and the momentum transfer, as well as over different models for the lattice-spacing and finite-volume dependence, using weights derived from the Akaike Information Criterion (AIC). Show Chinese abstract

Abstract: 我们展示了在包含夸克相连和不相连贡献的$(2 + 1)$-味协调格点模拟（CLS）集合上计算的质子和中子的电磁形式因子的结果。 我们的形式因子数据在$Q^2$、介子质量、格点间距和有限体积依赖性方面同时拟合到从包括矢量介子的协变标度扰动理论得出的表达式，同时还加入了对格点效应的模型。 从这些拟合中，我们确定了质子和中子的电半径和磁半径以及磁矩，以及质子的泽马赫半径。 为了评估系统效应的影响，我们对介子质量与动量转移的各种截断进行了平均，并对格点间距和有限体积依赖性的不同模型进行了平均，使用的权重来自于Akaike信息准则（AIC）。