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Coulomb effects on charged pion transverse momentum spectra measured in Au+Au collisions at RHIC-BES energies are investigated. From these spectra the π - / π + ratios as a function of transverse momentum are obtained and used to extract the “Coulomb kick”, p c (a momentum change due to the Coulomb interaction), and initial pion ratio for three different collision energies and various centrality classes. The Coulomb kick shows a decrease with the increase of beam energy and a clear centrality dependence, with larger values for the most central collisions. The results are connected with the kinetic freeze-out dynamics.

Coulomb Interaction Effects on Pion Production in Au+Au Collisions at Relativistic Energies