Forward Pion Production in p+p and d+Au Collisions at STAR

Details Forward Pion Production in p+p and d+Au Collisions at STAR Forward Pion Production in p+p and d+Au Collisions at STAR

2005-05-19

arxiv.org/abs/hep-ex/0505062v1

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 4 figures, presented at the XXXX Rencontres de Moriond on QCD and High Energy Hadronic Interactions in La Thuile, Ita

Scientific paper

Measurements are reported of the production of high energy pi-zero mesons from the STAR experiment in p+p and d+Au collisions at sqrt(s_NN)=200 GeV and =4.00 (d beam direction). The inclusive yield agrees with perturbative QCD calculations in p+p collisions, but is found to be reduced in d+Au collisions. The azimuthal correlations of the forward pi-zero with charged hadrons at midrapidity agree with PYTHIA in p+p collisions, but are suppressed in d+Au collisions. The results are consistent with the conjecture that the gluon density in nuclei is suppressed.

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