Publication : t09/152
Why is $v_4/(v_2)^2$ larger than predicted by hydrodynamics?
Gombeaud C. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)Ollitrault J.-Y. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Abstract:Année de publication : 2010
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.
Revue : Nucl. Phys. A 834 295c-297c (2010)
Conférence - Communication : par Clement Gombeaud; The 10th International Conference on Nucleus-Nucleus collisions ; Beijing, China ; 2009-08-16 / 2009-08-21
DOI : 10.1016/j.nuclphysa.2010.01.002
Preprint : arXiv:0910.0392
Langue : Anglais
Fichier(s) à télécharger :
publi.pdf
