Publication : t14/120

Azimuthal Anisotropy Distributions in High-Energy Collisions

Yan L. (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)
Poskanzer A.M. (Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley CA 94720, USA)
Abstract:
Elliptic flow in ultrarelativistic heavy-ion collisions results from the hydrodynamic response to the spatial anisotropy of the initial density profile. A long-standing problem in the interpretation of flow data is that uncertainties in the initial anisotropy are mingled with uncertainties in the response. We argue that the non-Gaussianity of flow fluctuations in small systems can be used to disentangle the initial state from the response. We apply this method to recent measurements of anisotropic flow in Pb+Pb and p+Pb collisions at the LHC. The response coefficient is found to decrease mildly as the system becomes smaller. This mild decrease is consistent with a low value of the ratio of viscosity over entropy.
Année de publication : 2015
Revue : Phys. Lett. B 742 290-295 (2015)
DOI : doi:10.1016/j.physletb.2015.01.039
Preprint : arXiv:1408.0921
Langue : Anglais

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