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Transverse momentum spectra of charged hadrons with ${p_{T} <}$ 6 GeV/c havebeen measured near mid-rapidity (0.2 $< \eta <$ 1.4) by the PHOBOS experimentat RHIC in Au + Au and d + Au collisions at ${\sqrt{s_{_{NN}}} = \rm {200GeV}}$. The spectra for different collision centralities are compared to ${p +\bar{p}}$ collisions at the same energy. The resulting nuclear modificationfactor for central Au + Au collisions shows evidence of strong suppression ofcharged hadrons in the high-$p_{T}$ region (${>2}$ GeV/c). In contrast, the d +Au nuclear modification factor exhibits no suppression of the high-$p_{T}$yields. These measurements suggest a large energy loss of the high-$p_{T}$particles in the highly interacting medium created in the central Au + Aucollisions. The lack of suppression in d + Au collisions suggests that it isunlikely that initial state effects can explain the suppression in the centralAu + Au collisions.Comment: 3 pages, 4 figures, International Europhysics Conference on High  Energy Physics EPS (July 17th-23rd 2003) in Aachen, German

Evidence of final-state suppression of high-p $_{_{\rm T}}$ hadrons in Au + Au collisions using d + Au measurements at RHIC