We calculate exclusive production of a longitudinally polarized heavy vector meson at next-to-leading order in the dipole picture. The large quark mass allows us to separately include both the first QCD correction proportional to the coupling constant ${\alpha }_{\mathrm{s}}$, and the first relativistic correction suppressed by the quark velocity $v^2$. Both of these corrections are found to be numerically important in $\mathrm{J}/\psi$ production. The results obtained are directly suitable for phenomenological calculations. We also demonstrate how vector meson production provides complementary information to structure function analyses when one extracts the initial condition for the energy evolution of the proton small-x structure.

我们计算了偶极子图片中紧邻前导顺序的纵向极化重矢量介子的独家产生。大夸克质量允许我们分别包括与耦合常数成正比的第一 QCD 校正${\alpha }_{\mathrm{秒}}$，以及被夸克速度抑制的第一次相对论修正 $v^2$. 发现这两种修正在数字上都很重要$\mathrm{J}/\psi$生产。所得结果直接适用于现象学计算。我们还展示了当提取质子小x结构能量演化的初始条件时，矢量介子产生如何为结构函数分析提供补充信息。