Abstract
Description of relativistic heavy-ion collisions at the energies of the BNL Relativistic Heavy Ion Collider (RHIC) Beam Energy Scan program with fluid dynamic approach poses several challenges, one of which being a complex geometry and a longer duration of the prehydrodynamic stage. Therefore, existing fluid dynamic models for heavy-ion collisions at the RHIC Beam Energy Scan energies rely on rather complex initial states, such as urqmd cascade or multifluid dynamics. In this study, we show that functionally simpler, nondynamical initial states can be employed for the fluid-dynamical simulations of Au-Au collisions at and 62.4 GeV. We adapt the initial states based on the Monte Carlo Glauber model (glissando 2) and ansatz based on reduced thickness ( ento ), extended into the longitudinal direction and finite baryon density. We find that both initial states, when coupled to a three-dimensional event-by-event viscous fluid dynamic cascade model, result in an overall fair reproduction of basic experimental data: pseudorapidity distributions, transverse momentum spectra, and elliptic flow, at both collision energies. This is rather surprising given that the ansatz is functionally similar to the EKRT and IP-Glasma models, which are successful at much larger energies and rely on a partonic picture of the initial state.
7 More- Received 21 December 2020
- Accepted 22 February 2021
DOI:https://doi.org/10.1103/PhysRevC.103.034902
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