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Azimuthal anisotropy and correlations in the hard scattering regime at RHIC

STAR Collaboration

nucl-exarXiv:nucl-ex/0206006

Abstract

Azimuthal anisotropy (v2) and two-particle angular correlations of high pT charged hadrons have been measured in Au+Au collisions at sNN=130 GeV for transverse momenta up to 6 GeV/c, where hard processes are expected to contribute significantly. The two-particle angular correlations exhibit elliptic flow and a structure suggestive of fragmentation of high pT partons. The monotonic rise of v2(pT) for pT<2 GeV/c is consistent with collective hydrodynamical flow calculations. At >3 GeV/c a saturation of v2 is observed which persists up to pT=6 GeV/c.

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