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18 April 2024

» pubmed » pmid12935010

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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
I Arsene ; I G Bearden ; D Beavis ; C Besliu ; B Budick ; H Bøggild ; C Chasman ; C H Christensen ; P Christiansen ; J Cibor ; R Debbe ; E Enger ; J J Gaardhøje ; M Germinario ; K Hagel ; O Hansen ; A Holm ; H Ito ; A Jipa ; F Jundt ; J I Jørdre ; C E Jørgensen ; R Karabowicz ; E J Kim ; T Kozik ; T M Larsen ; J H Lee ; Y K Lee ; S Lindal ; G Lystad ; G Løvhøiden ; Z Majka ; A Makeev ; B McBreen ; M Mikelsen ; M Murray ; J Natowitz ; B Neumann ; B S Nielsen ; J Norris ; D Ouerdane ; R P?aneta ; F Rami ; C Ristea ; O Ristea ; D Röhrich ; B H Samset ; D Sandberg ; S J Sanders ; R A Scheetz ; P Staszel ; T S Tveter ; F Videbaek ; R Wada ; Z Yin ; I S Zgura ; ;
Date:	15 Aug 2003
Journal:	Phys Rev Lett, 91 (7), 072305
Abstract:	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.
Source:	PubMed, pmid12935010
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