Energy Dependence of Elliptic Flow over a Large Pseudorapidity Range inAu+AuCollisions at the BNL Relativistic Heavy Ion Collider

This Letter 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. Data taken at collision energies of √sNN=19.6, 62.4, 130, and 200 GeV are shown over a wide range in pseudorapidity. These results, when plotted as a function of η^'=|η|-ybeam, scale with approximate linearity throughout η^', implying no sharp changes in the dynamics of particle production as a function of pseudorapidity or increasing beam energy.