System Size and Collision Energy Dependence of for Identified Charged Hadrons at RHIC-PHENIX

✍ Scribed by Maya Shimomura

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 235 KB
• Volume: 830
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2009.10.138

✦ Synopsis

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 √ 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.