AI 中文总结
研究重夸克偶素光生中质子胶子结构，构建全息 QCD 振幅对偶数自旋 - j 胶子交换求和，自旋 - 2 输入由晶格 QCD GFFs 确定，统一描述 J/ψ 截面，解释模型问题并提出改进方法。
AI 中文摘要
排他性重夸克偶素光生从近阈值（固定自旋交换、引力形状因子）到高能（雷吉化动力学）探测质子的胶子结构。我们构建了一个全息 QCD 振幅，它对偶数自旋 - j 胶子交换进行求和，自旋 - 2 输入由晶格 QCD GFFs 确定。新框架以统一方式描述了从 JLab 到 HERA 能量下的 J/ψ 截面。它解释了为何在阈值附近用于提取 GFF 的自旋 - 2 交换模型不是一个可控近似，并提出了改进方法。
英文摘要
Exclusive heavy quarkonium photoproduction probes the proton's gluonic structure from near-threshold (fixed-spin exchanges, gravitational form factors) to high energies (reggeized dynamics). We construct a holographic QCD amplitude that resums the even spin-$j$ gluonic exchanges, with the spin-2 input fixed by lattice QCD GFFs. The new framework describes the $J/ψ$ cross section from JLab to HERA energies in a unified manner. It explains why the spin-2 exchange model for GFF extraction near threshold is not a controlled approximation and suggests how to improve it.
Comments18 pages including Supplemental Material, 9 figures, 1 table
