Hydrodynamic simulations of directed flow for light hadrons in Au plus Au and isobar collisions at vsNN=200 GeV

作者：Jing, Jing; Jiang, Ze-Fang^*; Yang, C. B.; Zhang, Ben-Wei

来源：Chinese Physics C, 2023, 47(3): 034104.

DOI：10.1088/1674-1137/acac6a

• heavy ion collisions
• quark-gluon plasma
• directed flow
• isobar Ru and Zr

Using a (3+1)-D hydrodynamic model, CLVisc, we study the directed flow (v(1) ) of light hadrons produced in Au+Au, Ru+Ru, and Zr+Zr collisions at root(NN)-N-s = 200 GeV. The evolution of tilted energy density, pressure gradient, and radial flow along the x-direction is systematically investigated. The counter-clockwise tilt of the initial fireball is shown to be a vital source of directed flow for final light hadrons. A good description of directed flow is provided for light hadrons in central and mid-central Au+Au and isobar collisions at the RHIC. Our numerical results show a clear system size dependence for light hadron across different collision systems. We further v(1) study the effect of nuclear structure on the directed flow and find that for light hadrons is insensitive to nuclei v(1) with quadrupole deformation.