Energy dependence of elliptic flow over a large pseudorapidity range in Au+Au collisions at RHIC

Abstract

This paper describes the measurement of the energy dependence of elliptic flow for charged particles in Au+Au collisions using the PHOBOS detector at the Relativistic Heavy Ion Collider (RHIC). Data taken at collision energies of $\sqrt{s_{{}_{NN}}}=$ 19.6, 62.4, 130 and 200 GeV are shown over a wide range in pseudorapidity. These results, when plotted as a function of $\hat{I}{\cdot }^{\prime }=|\hat{I}\cdot |-y_{beam}$, scale with approximate linearity throughout $\hat{I}{\cdot }^{\prime }$, implying no sharp changes in the dynamics of particle production as a function of pseudorapidity or increasing beam energy.

5 pages, 4 figures