2024/01/24 by A. Matyja, Matyja, Adam Tomasz
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2401.13340
openalex publication_date 2024/01/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Incoherent and dissociative J/ψ photoproduction is sensitive to fluctuations of the gluonic structure of the target. Thus, the measurement of J/ψ photoproduction of the colliding hadron sheds light on the initial state of QCD and provides important constraints on the initial conditions used in hydrodynamical models of heavy-ion collisions. The first measurement of the transverse momentum dependence of both coherent and incoherent J/ψ photoproduction in ultraperipheral Pb-Pb collisions at midrapidity is presented. These new results provide, for the first time, a clear indication of subnucleonic fluctuations of the lead target. We also present the new measurement of dissociative J/ψ photoproduction cross section as a function of energy, in p-Pb collisions at forward rapidity. Dissociative results do not show any indication of saturation and agree with previous data.