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  • Open Access

Near-threshold photon-proton production of J/ψ and ϒ

Chentao Tan and Zhun Lu*

  • *Contact author: zhunlu@seu.edu.cn
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Phys. Rev. D 113, 114042 – Published 22 June, 2026

DOI: https://doi.org/10.1103/yfm3-qbg1

Abstract

We study the near-threshold exclusive photoproduction of heavy vector mesons (quarkonia J/ψ and ϒ) off the proton within the framework of generalized parton distribution (GPD) factorization. The gluon GPDs are computed using a spectator model in which the proton emits a gluon and the remaining constituents are treated as a single spectator particle. Model parameters are determined by fitting the gluon unpolarized and helicity collinear parton distribution functions from global analyses. We compare our results with the latest near-threshold J/ψ production data from the GlueX and J/ψ−007 experiments at Jefferson Laboratory, finding good agreement for both differential and total cross sections. Predictions are also provided for ϒ photoproduction, which can be tested at future electron-ion colliders.

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Phys. Rev. D 113, 114042– Published 22 June, 2026
  • Received 22 January 2026
  • Accepted 13 May 2026
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