We present a realistic lattice QCD study on low-energy N-J/ψ and N-ηc interactions based on (2+1) flavor configurations with nearly physical pion mass mπ=146 MeV. The interactions, extracted from the spacetime correlations of nucleon and charmonium system by using the HAL QCD method, are found to be attractive in all distances and possess a characteristic long-range tail consistent with the two-pion exchange potential. The resulting S-wave scattering lengths are 0.30(2)(−2+0) fm, 0.38(4)(−3+0) fm, and 0.21(2)(−1+0) fm for spin-3/2 N-J/ψ, spin-1/2 N-J/ψ, and spin-1/2 N-ηc, respectively. Our results are orders of magnitude larger than those from the photoproduction experiments assuming the vector meson dominance. Our findings may provide deeper understanding of the nonperturbative QCD phenomena ranging from the origin of nucleon mass to the in-medium J/ψ mass modification as well as the properties of hidden-charm pentaquark states.

中文翻译：

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晶格 QCD 的核子-钵相互作用


我们提出了一个基于接近物理 π 质量 mπ=146 MeV 的 （2+1） 风味构型的低能 N-J/ψ 和 N-ηc 相互作用的真实晶格 QCD 研究。使用 HAL QCD 方法从核子和谐子系统的时空相关性中提取的相互作用被发现在所有距离上都具有吸引力，并且具有与双 π 子交换电位一致的特征远程尾部。对于自旋-3/2 N-J/ψ、自旋-1/2 N-J/ψ和自旋-1/2 N-ηc，所得的 S 波散射长度分别为 0.30（2）（−2+0） fm、0.38（4）（−3+0） fm 和 0.21（2）（−1+0） fm。我们的结果比假设矢量介子优势的光生产实验的结果大几个数量级。我们的研究结果可能有助于更深入地了解从核子质量的起源到中等 J/ψ 质量修饰的非扰动 QCD 现象以及隐藏魅力五夸克态的特性。