Gravitational form factors of the proton from near-threshold vector meson photoproduction

作     者：王晓云 曾凡聪 张纪元 Xiao-Yun Wang;Fancong Zeng;Jiyuan Zhang

作者机构：Department of physicsLanzhou University of TechnologyLanzhou 730050China Lanzhou Center for Theoretical PhysicsKey Laboratory of Theoretical Physics of Gansu Provinceand Key Laboratory of Quantum Theory and Applications of MoELanzhou UniversityLanzhou 730000China Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2024年第48卷第5期

页      面：226-234页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：Supported by the National Natural Science Foundation of China(12065014,12247101) the Natural Science Foundation of Gansu province(22JR5RA266) We acknowledge the West Light Foundation of the Chinese Academy of Sciences(21JR7RA201)。 

主　　题：gravitational form factors properties of the proton vector mesonphotoproduction Schlessinger point method 

摘      要：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 mesonρ0 photoproduction.Combined with the gluon GFFs obtained from heavy quarkonium J/ψphotoproduction 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.