System Size and Collision Energy Dependence of v(2) for Identified Charged Hadrons at RHIC-PHENIX

作者：Shimomura Maya^*

来源：Nuclear Physics A, 2009, 830(1-4): 183C-186C.

DOI：10.1016/j.nuclphysa.2009.10.138

The transverse momentum (p(T)) and centrality dependence of the azimuthal anisotropy (v(2)) are measured for charged hadrons in different energies and collision species by the PHENIX experiment at RHIC. We find that v(2) divided by the participant eccentricity of the initial geometry proportionally increases with the number of participants to the 1/3 power except at small N-part in Cu+Cu at root s(NN) = 62.4 GeV. Taking the eccentricity and quark number scaling into account, there is a universal scaling for v(2) with different energies and collision sizes. The results indicate that v(2) is determined by more than just the geometrical eccentricity. It also depends on the size of collision. We also report that both the behaviors Of v(2) and p(T) distributions can be understood from the thermal nature of produced particles based on hydro-dynamical behavior.

• 出版日期2009-11-1