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(Department of physics,Lanzhou University of Technology,Lanzhou 730050,China;Lanzhou Center for Theoretical Physics,Key Laboratory of Theoretical Physics of Gansu Province,and Key Laboratory of Quantum Theory and Applications of MoE,Lanzhou University,Lanzhou 730000,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Department of physics,Lanzhou University of Technology,Lanzhou 730050,China [2]Lanzhou Center for Theoretical Physics,Key Laboratory of Theoretical Physics of Gansu Province,and Key Laboratory of Quantum Theory and Applications of MoE,Lanzhou University,Lanzhou 730000,China [3]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2024年第5期226-234,共9页中国物理C（英文版）

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)。

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.

关 键 词：gravitational form factors properties of the proton vector mesonphotoproduction Schlessinger point method 

分 类 号：O57[理学—粒子物理与原子核物理]