The coherent photonuclear production of a $\mathrm{J}/\psi$ vector meson at the LHC has been computed using two different sets of solutions of the impact-parameter dependent Balitsky-Kovchegov equation. The nuclear dipole scattering amplitudes are obtained either from (i) solutions for this process off proton targets coupled with a Glauber-Gribov prescription, or (ii) from solutions obtained with an initial condition representing the nucleus. These approaches predict different cross sections, which are compared with existing data from ultra-peripheral collisions at the LHC. The latter approach seems to better describe current measurements. Future LHC data should be precise enough to select one of the two approaches as the correct one.

相干光核产生 $\mathrm{Ĵ}/\psi$大型强子对撞机的矢量介子已使用依赖于冲击参数的Balitsky-Kovchegov方程的两组不同解进行了计算。核偶极子的散射幅度既可以从（i）质子靶标结合格劳伯-格里博夫处方的质子分离解决方案中获得，也可以从（ii）以代表核的初始条件获得的溶液中获得。这些方法可预测不同的横截面，并将其与大型强子对撞机超外围碰撞的现有数据进行比较。后一种方法似乎可以更好地描述当前的测量结果。未来的LHC数据应足够精确，以选择两种方法之一作为正确的方法。