The quality of the recent GlueX $J/\psi$ photoproduction data from Hall D at Jefferson Laboratory and the proximity of the data to the energy threshold, gives access to a variety of interesting physics aspects. As an example, an estimation of the $J/\psi$-nucleon scattering length ${\alpha }_{J/\psi p}$ is provided within the vector meson dominance model. It results in $|{\alpha }_{J/\psi p}|=(3.08\pm 0.55\left(\mathrm{stat}.\right)\pm 0.42\left(\mathrm{syst}.\right))$ mfm which is much smaller than a typical size of a hadron.

• Received 3 December 2019
• Accepted 20 March 2020

DOI:https://doi.org/10.1103/PhysRevC.101.042201

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Published by the American Physical Society