Abstract
Elliptic flow (ν2) measurements for Cu+Cu and Au+Au collisions at sNN = 200 GeV are used to probe several hydrodynamic scaling predictions. Eccentricity scaling of ν2 is observed for these data, suggesting essentially complete thermalization of the high energy density matter produced in these collisions. An estimate of the speed of sound is also obtained from the eccentricity scaled elliptic flow. The predicted mass scaling is observed for particles with transverse kinetic energy KET up to ∼ 1 GeV. For higher KET values, quark number scaling, compatible with partonic degrees of freedom, is observed.
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