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This paper investigates the transverse momentum broadening effect forelectromagnetic production of dileptons in ultra-peripheral heavy ioncollisions accompanied by nuclear dissociation. The electromagneticdissociation probability of nuclei for different neutron multiplicities isestimated, which could serve as a centrality definition (i.e. impact parameterestimate) in ultra-peripheral collisions. In the framework of lowest-order QED,the acoplanarity of dilepton pairs is calculated for different neutron emissionscenarios in ultra-peripheral collisions, indicating significantimpact-parameter dependence. The verification of impact-parameter dependence iscrucially important to understand the broadening effect observed in hadronicheavy-ion collisions.

Acoplanarity of QED pairs accompanied by nuclear dissociation in ultra-peripheral heavy ion collisions