Eur. Phys. J. A (2008) 38: 363-368
https://doi.org/10.1140/epja/i2008-10681-7

Regular Article - Theoretical Physics

Universal scaling of the elliptic flow data at RHIC

¹ Department of Atomic Physics, ELTE, Pázmány P. 1/A, H-1117, Budapest, Hungary
² Department of Chemistry, SUNY Stony Brook, 11794-3400, Stony Brook, NY, USA
³ MTA KFKI RMKI, P.O. Box 49, H-1525, Budapest 114, Hungary
⁴ Department of Physics, University of Lund, S-22362, Lund, Sweden

^* e-mail: csanad@elte.hu

Received: 4 August 2008
Revised: 6 October 2008
Accepted: 3 November 2008
Published online: 21 November 2008

Abstract

Recent PHOBOS measurements of the excitation function for the pseudo-rapidity dependence of the elliptic flow in Au + Au collisions at RHIC have posed a significant theoretical challenge. Here we show that these differential measurements, as well as the RHIC measurements on transverse momentum satisfy a universal scaling relation predicted by the Buda-Lund model, based on exact solutions of perfect fluid hydrodynamics. We also show that the recently found transverse kinetic energy scaling of the elliptic flow is a special case of this universal scaling.