Abstract
We have studied the dependence of azimuthal anisotropy for inclusive and identified charged hadrons in and collisions on collision energy, species, and centrality. The values of as a function of transverse momentum and centrality in collisions at and 62.4 GeV are the same within uncertainties. However, in collisions we observe a decrease in values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both and collisions we find that depends both on eccentricity and the number of participants, . We observe that divided by eccentricity () monotonically increases with and scales as . The data at 62.4 GeV falls below the other scaled data. For identified hadrons, divided by the number of constituent quarks is independent of hadron species as a function of transverse kinetic energy between GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the data at 62.4 GeV, of vs for all measured particles.
15 More- Received 3 December 2014
DOI:https://doi.org/10.1103/PhysRevC.92.034913
©2015 American Physical Society