Exploration of trace anomaly contribution to proton mass based on light vector meson photoproduction

被引：2

作者：

Dong, Chen ^{[1
]}

Zhang, Jiyuan ^{[1
]}

Bu, Jingxuan ^{[1
]}

Zhou, Huifang ^{[1
]}

Wang, Xiao-Yun ^{[1
,2
]}

机构：

[1] Lanzhou Univ Technol, Dept Phys, Lanzhou 730050, Peoples R China

[2] Lanzhou Univ, Lanzhou Ctr Theoret Phys, Key Lab Theoret Phys Gansu Prov, Lanzhou 730000, Gansu, Peoples R China

来源：

EUROPEAN PHYSICAL JOURNAL C | 2023年 / 83卷 / 02期

基金：

中国国家自然科学基金; 中国科学院西部之光基金;

关键词：

J/PSI-PHOTOPRODUCTION; ENERGY; MOMENTUM; OMEGA;

D O I：

10.1140/epjc/s10052-023-11260-0

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

In the quantum chromodynamics, the mass source of the proton is decomposed into four parts by the energy momentum tensor: quark energy term, gluon energy term, quark mass term and trace anomaly term. And the trace anomaly term is the most crucial contribution for studying the internal structure of the proton. In this work, under the definition of the vector meson dominant model, the trace anomaly contribution of the proton is extracted from the experimental data of light vector mesons rho, omega and phi photoproduction at the near-threshold, which are (0.53 +/- 0.15)%, (1.47 +/- 0.48)% and (2.73 +/- 0.54)%, respectively. Further, combined with the results extracted from the heavy vector meson J/psi photo production, the distribution of the trace anomaly contribution with the vector meson mass is given for the first time. These results may provide important theoretical information for determining the range of the trace anomaly contribution and for further understanding the origin of the proton mass.

引用

页数：9

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