Speaker
Description
In this work, the excess of $J/\psi$ production in peripheral collisions, which was experimentally observed at the LHC (ALICE) and RHIC (STAR) at low transverse momentum ($p_{T}$), is investigated. We use the color dipole formalism to calculate the photoproduction cross section, employing the phenomenological dipole models bCGC and IP-SAT, which take into account saturation effects, and the IP-NONSAT model, which does not account for saturation effects. In our calculations, we use the Gaus-LC and Boosted Gaussian models for the vector meson wave functions. The nucleus-nucleus cross section is described by the equivalent photon approximation using photon fluxes dependent on the impact parameter. Effective models for the photonuclear cross section and for the photon fluxes are used to consider the peripheral collisions. We present our results for the vector meson production in peripheral nuclear collisions in different centrality classes (50\%-70\% and 70\%-90\%).
