d+Au Collisions at STAR

Details d+Au Collisions at STAR d+Au Collisions at STAR

2006-07-08

arxiv.org/abs/nucl-ex/0607008v1

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures. To appear in proceedings of DIS2006

Scientific paper

STAR has measured forward pi^0 production in p+p and d+Au collisions at sqrt{s_{NN}}=200 GeV. The p+p yield generally agrees with NLO pQCD calculations. The d+Au yield is strongly suppressed at =4.0, well below shadowing expectations. Exploratory measurements of azimuthal correlations between forward pi^0 and mid-rapidity charged hadrons show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei. Future measurements to elucidate the dynamics underlying these observations are also described.

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