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

Abstract

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 datas of light vector mesons $\rho$, $\omega$ and $\varphi$ photoproduction at the near-threshold, which are ($1.15\pm 0.08$)$\%$, ($2.70\pm 0.04$)$\%$ and ($5.58\pm 0.25$)$\%$, respectively. Eventually, the average trace anomaly contribution of the proton is ($4.36\pm 0.40$) $\%$, which only account for a small fraction of the total proton mass. The result of this work will provide theoretical information support for further study of proton internal structure.

arXiv comment7 pages, 4 figures

References in corpus (26)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
• Electron-Ion Collider in China
• Forces inside hadrons: pressure, surface tension, mechanical radius, and all that
• Constraints on large-$x$ parton distributions from new weak boson production and deep-inelastic scattering data
• A QCD Analysis of the Mass Structure of the Nucleon
• Revisiting the mechanical properties of the nucleon
• Global parton distributions with nuclear and finite-Q^2 corrections
• Quark Mass and Field Anomalous Dimensions to $\mathcal{O}({\alpha }_s^5)$
• BREAKUP OF HADRON MASSES AND ENERGY-MOMENTUM TENSOR OF QCD
• On the hadron mass decomposition
• The mass radius of the proton
• Quark and gluon contributions to the QCD trace anomaly
• Spatial distribution of angular momentum inside the nucleon
• Revisiting the proton mass decomposition
• The Origin of Proton Mass from J/$\mathrm{\Psi }$ Photo-production Data
• $\omega$ and $\rho$ Photoproduction with an Effective Quark Model Lagrangian
• On the Sum Rule Approach to Quarkonium-Hadron Interactions
• $J/\psi$-$p$ Scattering Length from the Total and Differential Photoproduction Cross Sections
• Vector Meson Photoproduction with a Linearly Polarized Beam
• QCD Effective Coupling in the Infrared Region
• Near-threshold photoproduction of $J/\psi$ in two-gluon exchange model
• Extraction of Proton Trace Anomaly Energy from Near-Threshold $\varphi$ and $J/\psi$ photo-productions
• Partonic angular momentum in the nucleon's chiral periphery
• Mass radius and mechanical properties of the proton via strange $\varphi$ meson photoproduction
• Energy, angular momentum and pressure force distributions inside nucleons

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• Analysis of $J/\psi$ and $\psi (2S)$ Charmonium Production in Ultraperipheral Lead-Lead and Proton-Lead Collisions at LHC Energies