论文标题
与全球QCD分析面对格子parton分布
Confronting lattice parton distributions with global QCD analysis
论文作者
论文摘要
我们提出了第一个基于蒙特卡洛的全局QCD分析，对旋转和自旋依赖性的parton分布函数（PDFS），其中包括lattice QCD的坐标空间中的nucleon ISOVETOR矩阵元素。当在贝叶斯可能性分析的相同条件下处理晶格和实验数据时，我们研究了提取的PDF的普遍性。对于非极化部门，我们从现象学PDF的当前晶格数据中发现了相当弱的约束，以及在描述大空间距离处的晶格矩阵元素方面的困难。相反，对于极化PDF，我们发现实验和晶格数据之间有很好的一致性，而后者对旋转依赖性的ISOVECTOR夸克和Antiquark分布提供了重大约束。
We present the first Monte Carlo based global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs) that includes nucleon isovector matrix elements in coordinate space from lattice QCD. We investigate the degree of universality of the extracted PDFs when the lattice and experimental data are treated under the same conditions within the Bayesian likelihood analysis. For the unpolarized sector, we find rather weak constraints from the current lattice data on the phenomenological PDFs, and difficulties in describing the lattice matrix elements at large spatial distances. In contrast, for the polarized PDFs we find good agreement between experiment and lattice data, with the latter providing significant constraints on the spin-dependent isovector quark and antiquark distributions.
