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Transverse-momentum spectra in Au+Au and d+Au collisions at sqrt[s(NN)]=200 GeV and the pseudorapidity dependence of high-p(T) suppression |
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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 Hansen O Holm A Ito H Jipa A Jundt F Jørdre J I Jørgensen C E Karabowicz R Kim E J Kozik T Larsen T M Lee J H Lee Y K Lindal S Lystad G Løvhøiden G Majka Z Makeev A McBreen B Mikelsen M Murray M Natowitz J Neumann B Nielsen B S Norris J Ouerdane D Płaneta R Rami F Ristea C Ristea O Röhrich D Samset B H Sandberg D Sanders S J Scheetz R A Staszel P Tveter T S Videbaek F Wada R Yin Z Zgura I S;BRAHMS Collaboration |
| Institution: | Brookhaven National Laboratory, Upton, New York 11973, USA. |
| Abstract: | We present spectra of charged hadrons from Au+Au and d+Au collisions at sqrts(NN)]=200 GeV measured with the BRAHMS experiment at RHIC. The spectra for different collision centralities are compared to spectra from p+(-)p collisions at the same energy scaled by the number of binary collisions. The resulting ratios (nuclear modification factors) for central Au+Au collisions at eta=0 and eta=2.2 evidence a strong suppression in the high p(T) region (>2 GeV/c). In contrast, the d+Au nuclear modification factor (at eta=0) exhibits an enhancement of the high p(T) yields. These measurements indicate a high energy loss of the high p(T) particles in the medium created in the central Au+Au collisions. The lack of suppression in d+Au collisions makes it unlikely that initial state effects can explain the suppression in the central Au+Au collisions. |
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