Coherent Photoproduction of Low-$p_T$ Charmonium in Peripheral Heavy Ion Collisions within the Color Dipole Model

Abstract

We calculate the centrality dependence for coherent photoproduction of very low- p T J / ψ at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies within the impact parameter-dependent saturated color dipole model. By using the large equivalent photon fluxes, we present the differential cross-section of very low- p T J / ψ produced by coherent photonuclear in peripheral heavy ion collisions. The numerical results demonstrate that our calculation agrees with J / ψ data in peripheral heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) energies.

Production of <i>χ<sub>c</sub> </i>and <i>η<sub>c</sub></i> in Ultra-Peripheral Collisions with Two-Photon Processes

“…Consequently, Weizsäcker and Williams applied this method to relativistic nucleus [2] [3]. The equivalent photon flux presented in ultraperipheral collisions, that the two ions interact via their cloud of qusi-real photons, become very high at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies, and has been found many useful applications in heavy quarkonium production [4]- [14]. In recent years, the measurements for heavy quarkonium photoproduction have been reported by PHENIX Collaboration [15] at RHIC, as well as ALICE Collaboration [16] [17] [18] [19] at LHC.…”