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Rescattering effects in near-threshold $J / ψ$ photoproduction

S. Sakinah ¹, Sang-Ho Kim ^2,*, and H. M. Choi ¹

¹Department of Physics Education, Kyungpook National University, Daegu 41566, South Korea
²Department of Physics and Origin of Matter and Evolution of Galaxies (OMEG) Institute, Soongsil University, Seoul 06978, South Korea

^*Contact author: shkimphy@gmail.com

Phys. Rev. D 114, 054055 – Published 29 September, 2026

DOI: https://doi.org/10.1103/sh13-grfw

Abstract

We investigate near-threshold $J / ψ$ photoproduction off the nucleon, focusing on hadronic rescattering effects induced by open-charm meson-baryon intermediate states. Beyond the conventional Pomeron-exchange mechanism, the ${\bar{D}}^{0} Λ_{c}^{+}$ and ${\bar{D}}^{* 0} Λ_{c}^{+}$ channels are incorporated within an effective Lagrangian framework. The relevant production amplitudes are constructed at tree level from $t$ -, $s$ -, and $u$ -channel diagrams in a gauge-invariant manner. The resulting total and $t$ -dependent differential cross sections are compared with recent near-threshold data from the GlueX, $J / ψ − 007$ , and CLAS experiments at Jefferson Laboratory. We find that the open-charm rescattering contributions improve the description of the data, especially for the differential cross sections at large momentum transfer, and can generate cusplike enhancements near the ${\bar{D}}^{0} Λ_{c}^{+}$ and ${\bar{D}}^{* 0} Λ_{c}^{+}$ thresholds within the present hadronic model. We further present model estimates for the associated open-charm production processes $γ p \to {\bar{D}}^{(*) 0} Λ_{c}^{+}$ , with total cross sections of the order of a few nanobarns.

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Phys. Rev. D 114, 054055– Published 29 September, 2026

Vol. 114, Iss. 5 — 1 September 2026

Received 16 April 2026
Accepted 26 August 2026

DOI: https://doi.org/10.1103/sh13-grfw

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Rescattering effects in near-threshold $J / ψ$ photoproduction

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Rescattering effects in near-threshold J/ψ photoproduction

Abstract

Physics Subject Headings (PhySH)

Article Text

References (70)

Rescattering effects in near-threshold $J / ψ$ photoproduction