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Forward Neutral Pion Production in p+p and d+Au Collisions at sqrt(s_NN)=200 GeV

STAR Collaboration·J. Adams
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Abstract

Measurements of the production of forward pi0 mesons from p+p and d+Au collisions at sqrt(s_NN)=200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as eta increases, decreasing to ~30% of the p+p yield at =4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward pi0 with charged hadrons at eta~0 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.

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STAR Collaboration, J. Adams. 2006-10-12. Forward Neutral Pion Production in p+p and d+Au Collisions at sqrt(s_NN)=200 GeV. https://doi.org/10.1103/physrevlett.97.152302

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