1. Elliptic Anisotropy ν2 May Be Dominated by Particle Escape instead of Hydrodynamic Flow.
- Author
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Lin, Zi-Wei, He, Liang, Edmonds, Terrence, Liu, Feng, Molnar, Denes, and Wang, Fuqiang
- Subjects
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ANISOTROPY , *PARTICLES (Nuclear physics) , *HYDRODYNAMICS , *RELATIVISTIC Heavy Ion Collider , *QUARK-gluon plasma - Abstract
It is commonly believed that azimuthal anisotropies in relativistic heavy ion collisions are generated by hydrodynamic evolution of the strongly interacting quark-gluon plasma. Here we use transport models to study how azimuthal anisotropies depend on the number of collisions that each parton suffers. We find that the majority of ν 2 comes from the anisotropic escape of partons, not from the parton collective flow, for semi-central Au+Au collisions at 200A GeV. As expected, the fraction of ν 2 from the anisotropic particle escape is even higher for smaller systems such as d+Au. Our transport model results also confirm that azimuthal anisotropies would be dominated by hydrodynamic flow at unrealistically-high parton cross sections. Our finding thus naturally explains the similarity of azimuthal anisotropies in small and large systems; however, it presents a challenge to the paradigm of anisotropic flow. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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