The RHIC azimuth quadrupole: "perfect liquid" or gluonic radiation?

Details The RHIC azimuth quadrupole: "perfect liquid" or gluonic radiation? The RHIC azimuth quadrupole: "perfect liquid" or gluonic radiation?

2007-08-06

arxiv.org/abs/0708.0792v1

Mod.Phys.Lett.A23:569-589,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 6 figures

Scientific paper

10.1142/S0217732308026637

Large elliptic flow at RHIC seems to indicate that ideal hydrodynamics provides a good description of Au-Au collisions, at least at the maximum RHIC energy. The medium formed has been interpreted as a nearly perfect (low-viscosity) liquid, and connections have been made to gravitation through string theory. Recently, claimed observations of large flow fluctuations comparable to participant eccentricity fluctuations seem to confirm the ideal hydro scenario. However, determination of the azimuth quadrupole with 2D angular autocorrelations, which accurately distinguish ``flow'' (quadrupole) from ``nonflow'' (minijets), contradicts conventional interpretations. Centrality trends may depend only on the initial parton geometry, and methods used to isolate flow fluctuations are sensitive instead mainly to minijet correlations. The results presented in this paper suggest that the azimuth quadrupole may be a manifestation of gluonic multipole radiation.

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