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Deciphering the mechanism of J / ψ -nucleon scattering
Bing Wu1,2,3, Xiang-Kun Dong4, Meng-Lin Du1
1School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China.
None:
The low-energy scattering is important for various reasons: it is related to the hidden-charm pentaquark states, provides insights into the role of gluons in nucleon structures, and is relevant to the 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 -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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