Estimation of ${\rm Y}$(1S) production in ep process near threshold

Abstract

The near-threshold photo-productions of heavy quarkonia are important ways to test the QCD-inspired models and to constrain the gluon distribution of nucleon in the large x region. Investigating the various models, we choose a photon-gluon fusion model and a pomeron exchange model for J/$\Psi$ photo-production near threshold, emphasising on the explanation of the recent experimental measurement by GlueX at JLab. We find that these two models are not only valid in a wide range of the center-of-mass energy of $\gamma$ and proton, but also can be generalized to describe the ${\rm Y}$(1S) photo-production. Using these two models, we predict the electro-production cross-sections of ${\rm Y}$(1S) at EicC to be 48 fb to 85 fb at the center-of-mass energy of 16.75 GeV.

arXiv comment5 pages, 4 figures

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• Systematic analysis of the proton mass radius based on photoproduction of vector charmoniums
• Near-threshold photoproduction of $J/\psi$ in two-gluon exchange model
• \boldmath{${\rm Y}$} and \boldmath{${\eta }_b$} mass shifts in nuclear matter
• The ${\psi }^{(\ast )}p$ scattering length based on near-threshold charmoniums photoproduction
• Mass radius and mechanical properties of the proton via strange $\varphi$ meson photoproduction
• Analysis of the contribution of the quantum anomaly energy to the proton mass
• Near threshold heavy vector meson photoproduction at LHC and EicC
• Analysis of $J/\psi$ and $\psi (2S)$ Charmonium Production in Ultraperipheral Lead-Lead and Proton-Lead Collisions at LHC Energies