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arXiv 2204.00543hep-phhep-exhep-latnucl-th
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π介子部分子分布的实验和格点量子色动力学数据的互补性

Complementarity of experimental and lattice QCD data on pion parton distributions

P. C. Barry, C. Egerer, J. Karpie, W. Melnitchouk, C. Monahan, K. Orginos, Jian-Wei Qiu, D. Richards, N. Sato, R. S. Sufian, S. Zafeiropoulos

摘要:

在对实验数据的MonteCarlo整体QCD分析中,我们提取了π介子的部分子分布函数(PDF)以及由格点量子色动力学产生的电流-电流耦合子的约化Ioffe时间赝分布和矩阵元。通过包括实验和格点量子色动力学的数据,我们的分析严格量化的不确定性的π PDF和系统的影响内在的格点量子色动力学观测。约化的Ioffe时间伪分布显著降低了PDF上的不确定性,而电流-电流转换器受到与晶格相关的系统效应的限制。与最近的唯象测定一致,发现在大动量分数下π介子的价夸克分布的行为是具有$β_{\rm eff} \approx 1.0-1.2$的$\sim (1-x)^{ β_{\rm eff}}$。

英文摘要:

We extract pion parton distribution functions (PDFs) in a Monte Carlo global QCD analysis of experimental data together with reduced Ioffe time pseudo-distributions and matrix elements of current-current correlators generated from lattice QCD. By including both experimental and lattice QCD data, our analysis rigorously quantifies both the uncertainties of the pion PDFs and systematic effects intrinsic to the lattice QCD observables. The reduced Ioffe time pseudo-distributions significantly decrease the uncertainties on the PDFs, while the current-current correlators are limited by the systematic effects associated with the lattice. Consistent with recent phenomenological determinations, the behavior of the valence quark distribution of the pion at large momentum fraction is found to be $\sim (1-x)^{ β_{\rm eff}}$ with $β_{\rm eff} \approx 1.0-1.2$.

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