Systematic study of v sub(2) at 62.4 and 200 GeV in Cu + Cu and Au + Au Collisions at RHIC-PHENIX

The transverse momentum (p sub(T)) and centrality dependence of the azimuthal anisotropy (v sub(2)) are measured for charged hadron species at 62.4 and 200 GeV in Cu + Cu and Au + Au collisions by the PHENIX experiment at RHIC. The results are consistent with eccentricity scaling and with quark numb...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-01, Vol.270, p.1-4
Main Author: Shimomura, Maya
Format: Article
Language:English
Subjects:
Anisotropy
Charging
Collisions
Copper
Eccentricity
Fittings
Hadrons
Kinetic energy
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Summary:The transverse momentum (p sub(T)) and centrality dependence of the azimuthal anisotropy (v sub(2)) are measured for charged hadron species at 62.4 and 200 GeV in Cu + Cu and Au + Au collisions by the PHENIX experiment at RHIC. The results are consistent with eccentricity scaling and with quark number (n sub(q)) + transverse kinetic energy (KE sub(T)) scaling. Also, we found that v sub(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 sub(part) in Cu+Cu at [radical]s sub(NN) = 62.4 GeV. Taking these scalings (n sub(q), KE sub(T), eccentricity and N sub(part) super(1/3)) into account, there is a universal scaling for v sub(2) with different energies, collision sizes and particle species. The results indicate that v sub(2) is determined by more than just the geometrical eccentricity and also depends on the size of the collision. Moreover, using blast wave fitting, we report that both the behaviors of v sub(2) and p sub(T) distributions can be understood from the thermal nature of produced particles based on hydro-dynamical behavior.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/270/1/012041