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arXiv 0710.0541hep-lathep-phnucl-th
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核子广义形状因子的手征分析

Chiral Analysis of the Generalized Form Factors of the Nucleon

Marina Dorati, Tobias A. Gail, Thomas R. Hemmert

摘要:

本文应用手征微扰论的方法分析了核子中广义部分子分布的一阶矩,即广义形状因子。这些量目前也正在研究中的格点量子色动力学分析重子结构,提供模拟结果在大夸克质量外推到“现实世界”通过手征有效场论。我们在重子手征微扰理论(BChPT)的协变框架下进行了一个单圈计算,预测了所有矢量和轴向(广义)形状因子的动量和夸克质量依赖关系.特别地,我们讨论了消失的四动量转移的极限的GPD矩减少到众所周知的部分子分布函数(PDF)的时刻的结果。我们将我们的结果拟合到可用的格点量子色动力学数据,外推到物理点。最后,我们提出了优秀的结果,从一个组合适合不同的GPD时刻。

英文摘要:

We apply the methods of Chiral Perturbation Theory to the analysis of the first moments of the Generalized Parton Distributions in a Nucleon, usually known as generalized form factors. These quantities are currently also under investigation in Lattice QCD analyses of baryon structure, providing simulation results at large quark masses to be extrapolated to the "real world" via Chiral Effective Field Theory. We have performed a leading-one-loop calculation in the covariant framework of Baryon Chiral Perturbation Theory (BChPT), predicting both the momentum and the quark-mass dependence for all the vector and axial (generalized) form factors. In particular we discuss the results for the limit of vanishing four-momentum transfer where the GPD-moments reduce to the well known moments of Parton Distribution Functions (PDFs). We fit our results to available lattice QCD data, extrapolating down to the physical point. We conclude by presenting outstanding results from a combined fit to different GPDs-moments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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