Abstract
The azimuthal anisotropy coefficients v 2 , 3 , 4 , characterizing collective flow in Au + Au collisions, are presented for identified particle species as a function of transverse momentum ( p T ) , centrality (cent) and beam collision energy ( s N N = 0.039 – 0.20 TeV ) . The v n values for each particle species, show little, if any, change over the measured beam energy range, and v n / ( n q ) n / 2 vs. K E T / n q scales to a single curve (constituent quark number ( n q ) scaling) for each n , over a broad range of transverse kinetic energies ( K E T ) . A comparison of v 2 ( p T ) for individual particle species obtained in Au + Au collisions at s N N = 0.20 TeV (RHIC) and Pb + Pb collisions at s N N = 2.76 TeV (LHC), indicate stronger collective flow at the LHC. These flow measurements and their scaling patterns, can provide important additional constraints for extraction of the specific viscosity η / s .
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