发表机构
Indian Institute of Technology Bombay; Stony Brook University（印度孟买印度理工学院; 石溪大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究在饱和框架下，利用排他性矢量介子产生作为探针，揭示了小x处核的壳结构效应，为EIC分离饱和效应提供了基准。
AI 中文摘要
我们首次报告，在饱和框架内，小x处的排他性矢量介子产生对靶核的壳结构敏感。夸克-介子耦合（QMC）模型中占据单粒子轨道的自洽核密度会修改相干|t|微分截面，增强轻核的次级衍射瓣，移动中等质量核中|t|的高阶极小值，而对于重靶，这种偏移更弱且出现在更大的|t|处。由于小J/ψ偶极子对饱和不敏感，这些特征使相干J/ψ产生成为探测核壳结构的干净探针，对钙同位素等中等质量核最为有利。对于更大的φ偶极子，必须在核初态中包含壳结构，才能在电子离子对撞机（EIC）的微分可观测量中分离出饱和效应。我们的结果确立了排他性矢量介子产生作为小x处核的平均场、单粒子结构的探针，并为分离剩余的多体关联提供了基准。
英文摘要
We report for the first time that, within the saturation framework, exclusive vector meson production at small $x$ is sensitive to the shell structure of the target nucleus. Self-consistent nuclear densities from occupied single-particle orbitals in the quark-meson coupling (QMC) model modify the coherent $|t|$-differential cross section, enhancing secondary diffractive lobes in light nuclei and displacing the higher-order minima in intermediate-mass nuclei, whereas for heavy targets the shifts are weaker. Because the small $J/ψ$ dipole is insensitive to saturation, these features make coherent $J/ψ$ production a clean probe of nuclear shell structure, most favorably for intermediate-mass nuclei such as calcium isotopes. For the larger $ϕ$ dipole, shell structure must be included in the nuclear initial state before saturation effects can be isolated in differential observables at the Electron Ion Collider. Our results establish exclusive vector meson production as a probe of the mean-field nuclear structure at small $x$ and provide a baseline for isolating residual many-body correlations.
