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Centrality dependence of charged-particle pseudorapidity distributions from d + Au collisions at sqrt[sNN] = 200 GeV |
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| Authors: | Arsene I Bearden I G Beavis D Besliu C Budick B Bøggild H Chasman C Christensen C H Christiansen P Cibor J Debbe R Enger E Gaardhøje J J Germinario M Hagel K Ito H Jipa A Jørdre J I Jundt F Jørgensen C E Karabowicz R Kim E J Kozik T Larsen T M Lee J H Lee Y K Lindal S Lystad R Løvhøiden G Majka Z Makeev A Mikelsen M Murray M Natowitz J Neumann B Nielsen B S Ouerdane D Płaneta R Rami F Ristea C Ristea O Röhrich D Samset B H Sandberg D Sanders S J Sheetz R A Staszel P Tveter T S Videbaek F Wada R Yin Z Zgura I S;BRAHMS Collaboration |
| Institution: | University of Bucharest, Bucharest, Romania. |
| Abstract: | Charged-particle pseudorapidity densities are presented for the d + Au reaction at sqrts(NN)] = 200 GeV with -4.2 < or = eta < or = 4.2. The results, from the BRAHMS experiment at BNL Relativistic Heavy-Ion Collider, are shown for minimum-bias events and 0%-30%, 30%-60%, and 60%-80% centrality classes. Models incorporating both soft physics and hard, perturbative QCD-based scattering physics agree well with the experimental results. The data do not support predictions based on strong-coupling, semiclassical QCD. In the deuteron-fragmentation region the central 200 GeV data show behavior similar to full-overlap d+Au results at sqrts(NN)] = 19.4 GeV. |
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