Abstract
Based on the newly updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model, the pion potentials obtained from the in-medium dispersion relation of the -hole model and from the modified phenomenological approach are further introduced. Both the rapidity and transverse-velocity dependence of directed and elliptic flows of and charged mesons produced from Au+Au collisions at two beam energies of 1.0 and 1.5 GeV/nucleon and within a large centrality region of are scanned. Calculations with pion potentials as well as without considering the pion potential are compared to the newly experimental data released by the FOPI Collaboration at GSI Helmholtzzentrum für Schwerionenforschung. It is found that the directed flow is more sensitive to the pion potential than the elliptic one, and the attractive pion potential from the phenomenological B mode of the phenomenological approach is too strong to describe the flow data and can be safely ruled out. The relatively weak pion potential from the -hole model can supply a good description for the FOPI data of both flows as functions of both centrality and rapidity. A two-peak structure occurs in the transverse-velocity-dependent directed flow but the elliptic flow drops monotonously with increasing . Finally, both and flows with large from semicentral heavy-ion collisions can be taken as sensitive probes for the pion potential.
- Received 1 January 2018
- Revised 5 February 2018
DOI:https://doi.org/10.1103/PhysRevC.97.034602
©2018 American Physical Society