J/$\psi$p Scattering Length from GlueX Threshold Measurements

TL;DR

This paper estimates the $J/\psi$-nucleon scattering length using recent GlueX photoproduction data near threshold, providing insights into charmonium-nucleon interactions.

Contribution

It presents the first estimation of the $J/\psi$-nucleon scattering length from threshold measurements within the vector meson dominance model.

Findings

Estimated $J/\psi$-nucleon scattering length: $|\alpha_{J/\psi p}| = (3.08\pm 0.55\text{(stat.)} \pm 0.45\text{(syst.)})$ mfm.

Demonstrates the potential of threshold photoproduction data to probe charmonium-nucleon interactions.

Abstract

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 $|\alpha_{J/\psi p}| = (3.08\pm 0.55 ({\rm stat.}) \pm 0.45 ({\rm syst.}))$~mfm.