Phys. Rev. Lett. 91, 072305 (2003) [4 pages]Transverse-Momentum Spectra in Au+Au and d+Au Collisions at √sNN=200 GeV and the Pseudorapidity Dependence of High-pT SuppressionReceived 3 July 2003; published 15 August 2003 We present spectra of charged hadrons from Au+Au and d+Au collisions at √sNN=200 GeV measured with the BRAHMS experiment at RHIC. The spectra for different collision centralities are compared to spectra from p+p̅ collisions at the same energy scaled by the number of binary collisions. The resulting ratios (nuclear modification factors) for central Au+Au collisions at η=0 and η=2.2 evidence a strong suppression in the high pT region (>2 GeV/c). In contrast, the d+Au nuclear modification factor (at η=0) exhibits an enhancement of the high pT yields. These measurements indicate a high energy loss of the high pT 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.072305
DOI:
10.1103/PhysRevLett.91.072305
PACS:
25.75.Dw
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