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    Exclusive J/ψ photoproduction on nuclei

    Sang-Ho Kim1,*, T.-S. H. Lee2,†, and R. B. Wiringa2

    • *Contact author: shkimphy@gmail.com
    • †Contact author: tshlee@anl.gov

    Phys. Rev. C 112, 015206 – Published 14 July, 2025

    DOI: https://doi.org/10.1103/6j26-ht6s

    Abstract

    Motivated by recent experimental developments, the Pomeron constituent quark model (Pom-CQM) of the γ+N→J/ψ+N reaction of Lee et al. [Eur. Phys. J. A 58, 252 (2022)] and Sakinah et al. [Phys. Rev. C 109, 065204 (2024)] is applied to predict the exclusive J/ψ photoproduction on nuclei (A). Within the multiple scattering theory, the calculations are performed by including the impulse amplitude TJ/ψA,γAIMP and the J/ψ-nucleus final state interaction (FSI) amplitude TJ/ψA,γAFSI. For the deuteron target, TJ/ψd,γdIMP is calculated exactly using the wave function generated from the realistic nucleon-nucleon potentials. It is found that, near the threshold region, the J/ψ photoproduction cross sections depend sensitively on the d state of the deuteron wave function. The FSI amplitude TJ/ψA,γAFSI is calculated using the first-order optical potential constructed from the J/ψ−N scattering amplitude generated from the employed Pom-CQM. It turns out that the FSI has significant effects in the large momentum-transfer region. By using the conventional fixed scatter approximation (FSA) and the nuclear form factors from the variational Monte Carlo (VMC) calculations of Lonardoni et al. [Phys. Rev. C 96, 024326 (2017)], the cross sections of the J/ψ photo production on He4, O16, and Ca40 are also predicted for future experimental investigations at Jefferson Lab and the Electron-Ion Collider.

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