Abstract

From measured rapidity distributions d N / d y of p, p ¯ in central Au+Au collisions at s N N = 200 GeV , we find an average rapidity loss per participant nucleon is 2.0 ± 0.2 units of rapidity. We have also measured high transverse momentum particles. For central A u + A u collisions, we observe a suppression at both η = 0 , 2.2 , while for peripheral collisions there is no evidence of this suppression. In d + A u , there is an enhancement at midrapidity, while at forward rapidities the spectra become suppressed.

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