System Size and Collision Energy Dependence of \(v_2\) for Identified Charged Hadrons at RHIC-PHENIX

The transverse momentum (\(p_{\rm T}\)) 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 geome...

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Bibliographic Details
Published in:arXiv.org 2009-10
Main Authors: Shimomura, Maya, the PHENIX Collaboration
Format: Article
Language:English
Subjects:
Anisotropy
Dependence
Eccentricity
Hadrons
Quarks
Scaling
Transverse momentum
Online Access:Get full text
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Summary:The transverse momentum (\(p_{\rm T}\)) 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 \(N_{\rm part}\) in Cu+Cu at \(\sqrt{s_{\rm NN}}\) = 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 \(p_{\rm T}\) distributions can be understood from the thermal nature of produced particles based on hydro-dynamical behavior.
ISSN:2331-8422
DOI:10.48550/arxiv.0908.0052