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赝标量介子在非零斜度下从领先扭度到高扭度的广义部分子分布

Leading-twist to higher-twist generalized parton distributions of the pseudoscalar mesons at non-zero skewness

Abi Jebarson A, Navpreet Kaur, Harleen Dahiya

arXiv 2607.00503首次发表:更新:

发表机构

Department of Physics, Dr. B. R. Ambedkar National Institute of Technology(德拉·比·阿姆贝德卡尔国家技术学院物理系)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

利用光前夸克模型计算π和K介子直到扭度-4的八种广义部分子分布,在非零斜度DGLAP区域揭示SU(3)味对称性破缺及高扭度关联的介子质量依赖性。

AI 中文摘要

我们研究了自旋-0介子(特别是π介子和K介子)的多维部分子结构,通过评估其直到扭度-4的完整八种广义部分子分布(GPDs)。利用具有Brodsky-Huang-Lepage(BHL)方案的光前夸克模型(LFQM),我们在运动学丰富的非零斜度($\xi \neq 0$)区域,严格在DGLAP区域($x \in [\xi, 1]$)内计算这些分布。为了构建三维断层图像,我们对动量空间的GPDs进行傅里叶变换,得到横向平面上的碰撞参数依赖的部分子分布函数(IPDPDFs)以及纵向坐标空间中的相应衍射图样。数值结果明确揭示了SU(3)味对称性破缺的后果,因为K介子中的奇异夸克与较轻的上夸克相比,其空间局域性发生了动态偏移。我们还观察到,虽然高扭度关联在π介子中表现出巨大的振幅缩放,但在K介子中由于较大的宏观质量而被强烈抑制。

英文摘要

We investigate the multidimensional partonic structure of spin-0 mesons, specifically the pion and the kaon, by evaluating their complete set of eight generalized parton distributions (GPDs) up to twist-4. Utilizing the light-front quark model (LFQM) with the Brodsky-Huang-Lepage (BHL) prescription, we compute these distributions in the kinematically rich non-zero skewness ($ξ\neq 0$) domain, strictly within the DGLAP region, $x \in [ξ, 1]$. To construct a three-dimensional tomographic picture, we perform Fourier transforms of the momentum-space GPDs to obtain the impact parameter dependent parton distribution functions (IPDPDFs) in the transverse plane and the corresponding diffraction patterns in the longitudinal coordinate space. The numerical results explicitly reveal the consequences of $\mathrm{SU}(3)$ flavor symmetry breaking in the LFQM, as the strange quark in the kaon dynamically shifts spatial localizations compared to the lighter up quarks. We also observe that while higher-twist correlations exhibit massive amplitude scaling in the pion, they are heavily suppressed by the larger macroscopic mass of the kaon.

Comments32 pages and 7 figures. To appear in Phys. Rev D

论文原文

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