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arXiv · 2410.19526

Deciphering the mechanism of $J/\psi$-nucleon scattering

Bing Wu·Xiang-Kun Dong·Meng-Lin Du·Feng-Kun Guo·Bing-Song Zou
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Abstract

The low-energy $J/\psi N$ scattering is important for various reasons: it is related to the hidden-charm $P_c$ pentaquark states, provides insights into the role of gluons in nucleon structures, and is relevant to the $J/\psi$ properties in nuclear medium. The scattering can happen through two distinct mechanisms: the coupled-channel mechanism via open-charm meson-baryon intermediate states, and the soft-gluon exchange mechanism. We investigate the $J/\psi N$ $S$-wave scattering length through both mechanisms, and find that the soft-gluon exchange mechanism leads to a scattering length at least one order of magnitude larger than that from the coupled-channel mechanism and thus is the predominant one. The findings can be verified by lattice calculations and will enhance our understanding of the scattering processes breaking the Okubo-Zweig-Iizuka rule.

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Bing Wu, Xiang-Kun Dong, Meng-Lin Du, Feng-Kun Guo, Bing-Song Zou. 2024-10-25. Deciphering the mechanism of $J/\psi$-nucleon scattering. https://doi.org/10.1016/j.fmre.2025.07.005

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