Forward neutral pion production in p+p and d+Au collisions at VsNN=200 GeV
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Publication date
2006
Authors
Bai, Y.
Benedosso, F.
Botje, M.A.J.
Castillo, J.
Grebenyuk, O.
Mischke, A.
Peitzmann, T.
Russcher, M.J.
Snellings, R.J.M.
van der Kolk, N.
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Abstract
Measurements of the production of forward π0 mesons from p+p and d+Au collisions at VsNN=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 η increases, decreasing to ∼30% of the p+p yield at ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward π0 with charged hadrons at η≈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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Bai, Y, Benedosso, F, Botje, M A J, Castillo, J, Grebenyuk, O, Mischke, A, Peitzmann, T, Russcher, M J, Snellings, R J M & van der Kolk, N 2006, 'Forward neutral pion production in p+p and d+Au collisions at VsNN=200 GeV', Physical Review Letters, vol. 97, no. 15, pp. 152302/1-152302/6.