Systematic investigation of trace anomaly contribution in nucleon mass

Abstract

In this work, under the framework of vector meson dominance model, the trace anomaly contribution value inside neutrons are extracted for the first time based on vector meson photoproduction data. Furthermore, we systematically compare and analyze the trace anomaly contributions of protons and neutrons. The results show that the trace anomaly contributions of protons and neutrons are close, which indirectly confirms that their internal structures and dynamic properties may have certain similarities. In addition, the main factors affecting the extraction of the trace anomaly contribution of nucleons are discussed in detail. This study not only provides a theoretical basis for us to better understand the source of nucleon mass, but also makes a useful exploration and discussion on how to extract the trace anomaly contribution of nucleon more accurately in the future.

6 pages, 2 figures

References in corpus (15)

• Determination of the effective strong coupling constant alpha_{s,g_1}(Q^2) from CLAS spin structure function data
• $\Omega$ baryon spectrum and their decays in a constituent quark model
• Extraction of alpha_s from radiative Upsilon(1S) decays
• Measurement of the Bjorken Sum at very low $Q^2$
• $J/\psi$-$p$ Scattering Length from the Total and Differential Photoproduction Cross Sections
• Comments on differential cross section of phi-meson photoproduction at threshold
• QCD Effective Coupling in the Infrared Region
• Novel and self-consistency analysis of the QCD running coupling ${\alpha }_s(Q)$ in both the perturbative and nonperturbative domains
• The ${\psi }^{(\ast )}p$ scattering length based on near-threshold charmoniums photoproduction
• Extraction of Proton Trace Anomaly Energy from Near-Threshold $\varphi$ and $J/\psi$ photo-productions
• First extraction of the proton mass radius and scattering length $\left|{\alpha }_{{\rho }^{0}p}\right|$ from ${\rho }^0$ photoproduction
• Analysis of the contribution of the quantum anomaly energy to the proton mass
• Analysis of strong coupling constant with machine learning and its application
• Analysis of the interaction between $\varphi$ meson and nucleus
• Exploration of trace anomaly contribution to proton mass based on light vector meson photoproduction