Abstract :
From measured rapidity distributions dN/dy of p, View the MathML source in central Au+Au collisions at View the MathML source, 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 Au+Au collisions, we observe a suppression at both η=0,2.2, while for peripheral collisions there is no evidence of this suppression. In d+Au, there is an enhancement at midrapidity, while at forward rapidities the spectra become suppressed.
