Large observed v(2) as a signature for deconfinement

Abstract

We present a new plot for representing R AA(o) data that emphasizes the strong correlation between high-p η suppression and its elliptic anisotropy. We demonstrate that existing models cannot reproduce the centrality dependence of this correlation. Modification of a geometric energy loss model to include thermal absorption and stimulated emission can match the trend of the data, but requires dN g/dy values inconsistent with the observed multiplicity. By including a small, outward-normal directed surface impulse opposing energy loss, \(\Delta p_ \bot \hat n\), one can account for the centrality dependence of the observed Au+Au elliptic quench pattern. We also present predictions for Cu+Cu reactions.