Energy Dependence of Directed Flow in Au+Au Collisions from a Multi-phase Transport Model

Abstract

The directed flow of charged hadron and identified particles has been studied in the framework of a multi-phase transport (AMPT) model, for ${}^{197}$Au+${}^{197}$Au collisions at $\sqrt{s_{NN}}=$200, 130, 62.4, 39, 17.2 and 9.2 GeV. The rapidity, centrality and energy dependence of directed flow for charged particles over a wide rapidity range are presented. AMPT model gives the correct $v_1(y)$ slope, as well as its trend as a function of energy, while it underestimates the magnitude. Within the AMPT model, the proton $v_1$ slope is found to change its sign when the energy increases to 130 GeV - a feature that is consistent with ``anti-flow''. Hadronic re-scattering is found having little effect on $v_1$ at top RHIC energies. These studies can help us to understand the collective dynamics at early times in relativistic heavy-ion collisions, and they can also be served as references for the RHIC Beam Energy Scan program.

5 pages,4 figures

References in corpus (4)

• Multiplicity scaling in ideal and viscous hydrodynamics
• System-size independence of directed flow at the Relativistic Heavy-Ion Collider
• First results from Au+Au collisions at $\sqrt{(}{s}_{NN})$ = 9.2 GeV in STAR
• Collective Dynamics at RHIC

Cited by in corpus (9)

• Directed flow in ultrarelativistic heavy-ion collisions
• Examination of the directed flow puzzle in heavy-ion collisions
• Directed Flow of Identified Particles in Au + Au Collisions at $\sqrtsNN = 200$ GeV at RHIC
• Splitting of proton-antiproton directed flow in relativistic heavy-ion collisions
• Energy dependence study of directed flow in Au+Au collisions using an improved coalescence in AMPT model
• Directed flow of transported and non-transported protons in Au+Au collisions from UrQMD model
• Revisit of directed flow in relativistic heavy-ion collisions from a multiphase transport model
• Directed flow and global polarization in Au+Au collisions across energies covered by the beam energy scan at RHIC
• Directed Flow of Identified Particles in Au + Au Collisions at $\sqrtsNN = 200$ GeV