Viscous Damping of Anisotropic Flow in 7.7 ? 200 GeV Au+Au Collisions

16th International Conference on Strangeness in Quark Matter

Magdy, Niseem^1

Department of Chemistry, Stony Brook University, Stony Brook

NY

11794-3400, United States^1

关键词: Anisotropic flows;    Au+Au collisions;    Baryon chemical potential;    Excitation function;    Reaction dynamics;    Star measurements;    Viscous coefficients;    Viscous damping;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/779/1/012060/pdf
DOI  :  10.1088/1742-6596/779/1/012060

来源: IOP

【 摘 要 】

Recent STAR measurements of the anisotropic flow coefficients vn(2 ≤ n ≤ 5) in Au+Au collisions at RHIC, are presented for the full span of energies (7.7 - 200 GeV) employed in beam energy scan I (BES-I). The measurements which can provide strong constraints for the baryon chemical potential (μB) and temperature (T ) dependence of the specific shear viscosity η/s, indicate sizable dependencies on harmonic number n,pTand centrality, with similar patterns [but different magnitudes] across the beam energies studied. An excitation function for the viscous coefficient, extracted via specific ratios of vnfor a fixed centrality, indicates a non-monotonic pattern which could be related to the onset of critical reaction dynamics in the BES-I energy range.