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Systematic uncertainties in parton distribution functions from lattice QCD simulations at the physical point

机译:Parton分布函数的系统不确定性来自物理点的格子QCD模拟

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摘要

We present a detailed study of the helicity-dependent and helicity-independent collinear parton distribution functions (PDFs) of the nucleon, using the quasi-PDF approach. The lattice QCD computation is performed employing twisted mass fermions with a physical value of the light quark mass. We give a systematic and in-depth account of the salient features entering in the evaluation of quasi-PDFs and their relation to the light-cone PDFs. In particular, we give details for the computation of the matrix elements, including the study of the various sources of systematic uncertainties, such as excited-states contamination. In addition, we discuss the nonperturbative renormalization scheme used here and its systematics, effects of truncating the Fourier transform and different matching prescriptions. Finally, we show improved results for the PDFs and discuss future directions, challenges and prospects for evaluating precisely PDFs from lattice QCD with fully quantified uncertainties.
机译:我们使用准pDF方法介绍了核心依赖性和幽灵独立的共线性分布函数(PDF)的详细研究。 使用具有轻夸克质量的物理值的扭曲质量晶片进行晶格QCD计算。 我们对进入准PDF的评估及其与光锥PDF的关系进入的突出特征进行了系统和深入的叙述。 特别地,我们提供矩阵元素的计算的细节,包括对系统不确定性的各种来源的研究,例如兴奋状态污染。 此外,我们讨论了这里使用的非触发性重整化方案及其系统性,截断傅里叶变换和不同匹配处方的效果。 最后,我们显示了PDF的改进结果,并讨论了以完全量化的不确定性从格子QCD评估精确的PDF的未来方向,挑战和前景。

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