Why is $v_4/(v_2)^2$ larger than predicted by hydrodynamics?

Details Why is $v_4/(v_2)^2$ larger than predicted by hydrodynamics? Why is $v_4/(v_2)^2$ larger than predicted by hydrodynamics?

2009-10-02

arxiv.org/abs/0910.0392v1

Nucl.Phys.A834:295c-297c,2010

Physics

Nuclear Physics

Nuclear Theory

Proceedings of "Nucleus-Nucleus 2009" -Beijing (China), 16-21 August 2009

Scientific paper

10.1016/j.nuclphysa.2010.01.002

The second and fourth Fourier harmonics of the azimuthal distribution of particles, $v_2$ and $v_4$, have been mesured in Au-Au collisions at the Relativistic Heavy Ion Collider (RHIC). The ratio $v_4/(v_2)^2$ is significantly larger than predicted by hydrodynamics. Effects of partial thermalization are estimated on the basis of a transport calculation, and are shown to increase the ratio by a small amount. We argue that the large value of $v_4/(v_2)^2$ seen experimentally is mostly due to elliptic flow fluctuations. However, the standard model of eccentricity fluctuations is unable to explain the large magnitude of $v_4/(v_2)^2$ in central collisions.

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