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arXiv 2106.03451hep-lathep-ph
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从格点量子色动力学研究核子中的双重部分子分布

Double parton distributions in the nucleon from lattice QCD

Gunnar S. Bali, Markus Diehl, Benjamin Gläßle, Andreas Schäfer, Christian Zimmermann

摘要:

在格点量子色动力学的框架下计算了核子四点函数,以提取非极化质子双部分子分布的第一Mellin矩。在这第一项研究中,我们采用了nf = 2 + 1的赝标质量的mpi = 355 MeV和mK = 441 MeV的合奏。将结果转换为mu = 2 GeV的标度。我们的计算包括所有的威克收缩,并为他们几乎所有的一个很好的统计信号。我们分析了DPD Mellin矩对夸克味和夸克极化的依赖性。此外,经常使用的因式分解假设的有效性进行了研究。

英文摘要:

We evaluate nucleon four-point functions in the framework of lattice QCD in order to extract the first Mellin moment of double parton distributions (DPDs) in the unpolarized proton. In this first study, we employ an nf = 2 + 1 ensemble with pseudoscalar masses of mpi = 355 MeV and mK = 441 MeV. The results are converted to the scale mu = 2 GeV. Our calculation includes all Wick contractions, and for almost all of them a good statistical signal is obtained. We analyze the dependence of the DPD Mellin moments on the quark flavor and the quark polarization. Furthermore, the validity of frequently used factorization assumptions is investigated.

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