Evidence of final-state suppression of high-p... hadrons in Au + Au collisions using d + Au measurements at RHIC

Back, B.B.; Baker, M.D.; Ballintijn, M.; Barton, D.S.; Becker, B.; Betts, R.R.; Bickley, A.A.; Bindel, R.; Busza, W.; Carroll, A.; Decowski, M.P.; García, E.; Gburek, T.; George, N.; Gulbrandsen, K.; Gushue, S.; Halliwell, C.; Hamblen, J.; Harrington, A.S.; Henderson, C.
March 2004
European Physical Journal C -- Particles & Fields;Mar2004 Supplement 1, Vol. 33, ps606
Academic Journal
Transverse momentum spectra of charged hadrons with pT < 6 GeV/c have been measured near mid-rapidity (0.2 < η< 1.4) by the PHOBOS experiment at RHIC in Au + Au and d + Au collisions at √sNN = 200 GeV. The spectra for different collision centralities are compared to p+ &bmacr;p collisions at the same energy. The resulting nuclear modification factor for central Au + Au collisions shows evidence of strong suppression of charged hadrons in the high-pT region (> 2 GeV/c). In contrast, the d + Au nuclear modification factor exhibits no suppression of the high-pT yields. These measurements suggest a large energy loss of the high-pT particles in the highly interacting medium created in the central Au + Au collisions. The lack of suppression in d + Au collisions suggests that it is unlikely that initial state effects can explain the suppression in the central Au + Au collisions.


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