Medium effects on pion production in heavy ion collisions Academic Article uri icon


  • 2017 American Physical Society. Within the framework of the relativistic Vlasov-Uehling-Uhlenbeck transport model based on the relativistic nonlinear NL interaction, we study pion in-medium effects on the -/+ ratio in Au+Au collisions at the energy of E/A=400MeV. These effects include the isospin-dependent pion s-wave and p-wave potentials, which are taken from calculations based on the chiral perturbation theory and the -hole model, respectively. We find that the -/+ ratio in this collision is suppressed by the pion s-wave potential but enhanced by the p-wave potential, with a net effect of a significantly suppressed -/+ ratio. Including also the in-medium threshold effects on resonance production and decay and using a nuclear symmetry energy with a slope parameter L=59MeV by reducing the coupling of isovector-vector meson to nucleon, our result is in good agreement with measured -/+ ratio from the FOPI Collaboration. We further investigate the pion in-medium effects on the ratio of charged pions as a function of their kinetic energies.

published proceedings


altmetric score

  • 0.25

author list (cited authors)

  • Zhang, Z., & Ko, C. M.

citation count

  • 40

complete list of authors

  • Zhang, Zhen||Ko, Che Ming

publication date

  • June 2017