THE RHIC AZIMUTH QUADRUPOLE: "PERFECT LIQUID" OR GLUONIC RADIATION?
THE RHIC AZIMUTH QUADRUPOLE: "PERFECT LIQUID" OR GLUONIC RADIATION?
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RHIC 方位四极：“完美液体”还是胶子辐射？
DOI：
10.1142/s0217732308026637
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发表时间：
2007
影响因子：
1.4
通讯作者：
T. Trainor
中科院分区：
文献类型：
--
作者：
T. Trainor
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.
