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.

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, Null Null

Physical review letters（2003）

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摘要

We present spectra of charged hadrons from Au+Au and d+Au collisions at sqrt[s(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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