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Forward neutral pion production in p + p and d + Au collisions at square root sNN=200 GeV |
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| Authors: | Adams J Aggarwal M M Ahammed Z Amonett J Anderson B D Arkhipkin D Averichev G S Badyal S K Bai Y Balewski J Barannikova O Barnby L S Baudot J Bekele S Belaga V V Bellingeri-Laurikainen A Bellwied R Berger J Bezverkhny B I Bharadwaj S Bhasin A Bhati A K Bhatia V S Bichsel H Bielcik J Bielcikova J Billmeier A Bland L C Blyth C O Blyth S-L Bonner B E Botje M Boucham A Bouchet J Brandin A V Bravar A Bystersky M Cadman R V Cai X Z Caines H Sánchez M Calderón de la Barca Catu O Cebra D Chajecki Z Chaloupka P Chattopadhyay S Chen H F Chen J H Chen Y Cheng J Cherney M Chikanian A Choi H A Christie W |
| Affiliation: | University of Birmingham, Birmingham, United Kingdom. |
| Abstract: | Measurements of the production of forward pi0 mesons from p + p and d + Au collisions at square root sNN=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 approximately 30% of the p + p yield at eta =4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward pi0 with charged hadrons at eta approximately 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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