Transverse momentum spectra of J/ψ produced in collisions over an energy range from 17.4 GeV to 13 TeV

Abstract

Abstract Transverse momentum spectra of inclusive J/ψ mesons produced in particle–particle, particle–nucleus and nucleus–nucleus collisions over a center-of-mass energy range from 17.4 GeV to 13 TeV are analyzed by a multi-component Schwinger mechanism. The model results are found to fit the experimental data measured by the ALICE, CDF, D0, HERA-B, E789, NA50, E705, LHCb and PHENIX Collaborations. We extract the distribution of minimum distance between the partons which form the charmonium c c ¯ . Moreover, the energy and rapidity dependent free parameters in Schwinger mechanism are obtained. The parameter related to string tension is found to increase with the increase of energy and to decrease with the increase of rapidity and centrality.