A hot-spot model with saturation-scale and hotspot-number fluctuations plus a relativistic wave-function correction reproduces HERA exclusive J/psi data, with saturation-scale fluctuations dominating.
Further- more, the coherent cross section is subleading in this regime, so we can ignore the coherent-over- incoherent ratioR
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Exclusive $\mathrm{J}/\psi$ production off a dilute proton within a refined hotspot description
A hot-spot model with saturation-scale and hotspot-number fluctuations plus a relativistic wave-function correction reproduces HERA exclusive J/psi data, with saturation-scale fluctuations dominating.