Gravitational form factors of the proton from near-threshold vector meson photoproduction* * Supported by the National Natural Science Foundation of China (12065014, 12247101) and the Natural Science Foundation of Gansu province (22JR5RA266). We acknowledge the West Light Foundation of the Chinese Academy of Sciences (21JR7RA201)

IF 3.6 2区物理与天体物理 Q1 PHYSICS, NUCLEAR

Chinese Physics C Pub Date : 2024-05-01 DOI:10.1088/1674-1137/ad2a66

Xiao-Yun Wang, Fancong Zeng, Jiyuan Zhang

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Abstract

We systematically analyze the quark and gluon gravitational form factors (GFFs) of the proton by connecting the energy-momentum tensor and near-threshold vector meson photoproduction (NTVMP). Specifically, the quark contributions of GFFs are determined by applying global fitting to the cross section of the lightest vector meson

photoproduction. Combined with the gluon GFFs obtained from heavy quarkonium

photoproduction data, the complete GFFs are obtained and compared with the experimental results and lattice quantum chromodynamics determinations. In addition, we use the resonance via Padé (RVP) method based on the Schlessinger point method to obtain a model-independent quark D-term distribution through direct analytical continuation of deeply virtual Compton scattering experimental data. If errors are considered, the results obtained with RVP are essentially consistent with those obtained by NTVMP. Moreover, the comprehensive information on GFFs helps to uncover the mass distribution and mechanical properties inside the proton. This study is not only an important basis for delving into the enigmatic properties of the proton, but also has significance for theoretically guiding future JLab and EIC experimental measurements.

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近阈值矢量介子光生质子的引力形式因子* * 国家自然科学基金（12065014，12247101）和甘肃省自然科学基金（22JR5RA266）资助。感谢中国科学院西部之光基金(21JR7RA201)

我们通过连接能动张量和近阈值矢量介子光产（NTVMP），系统地分析了质子的夸克和胶子引力形式因子（GFFs）。具体来说，通过对最轻矢量介子光生成的截面进行全局拟合来确定夸克对引力形式因子的贡献。结合从重夸克光生成数据中得到的胶子 GFFs，我们得到了完整的 GFFs，并将其与实验结果和格子量子色动力学测定结果进行了比较。此外，我们使用基于施莱辛格点法的帕代共振（RVP）方法，通过对深度虚拟康普顿散射实验数据的直接分析延续，得到了与模型无关的夸克 D 项分布。如果考虑误差，用 RVP 得到的结果与用 NTVMP 得到的结果基本一致。此外，GFFs 的全面信息有助于揭示质子内部的质量分布和力学性质。这项研究不仅是探索质子神秘性质的重要依据，而且对未来的 JLab 和 EIC 实验测量具有重要的理论指导意义。

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来源期刊

Chinese Physics C 物理-物理：核物理

CiteScore

6.50

自引率

8.30%

发文量

8976

审稿时长

1.3 months

期刊介绍： Chinese Physics C covers the latest developments and achievements in the theory, experiment and applications of: Particle physics; Nuclear physics; Particle and nuclear astrophysics; Cosmology; Accelerator physics. The journal publishes original research papers, letters and reviews. The Letters section covers short reports on the latest important scientific results, published as quickly as possible. Such breakthrough research articles are a high priority for publication. The Editorial Board is composed of about fifty distinguished physicists, who are responsible for the review of submitted papers and who ensure the scientific quality of the journal. The journal has been awarded the Chinese Academy of Sciences ‘Excellent Journal’ award multiple times, and is recognized as one of China''s top one hundred key scientific periodicals by the General Administration of News and Publications.

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