Pseudorapidity Distributions of Charged Particles in d + Au and p + p Collisions at s_NN = 200GeV
Abstract
The measured pseudorapidity distributions of primary charged particles are presented for d + Au and p + p collisions at s_NN = 200 GeV over a wide pseudorapidity range of η 5.4. The results for d + Au collisions are presented for minimum-bias events and as a function of collision centrality. The measurements for p + p collisions are shown for minimum-bias events. The ratio of the charged particle multiplicity in d + Au and p + A collisions relative to that for inelastic p + p collisions is found to depend only on < Npart >, and it is remarkably independent of collision energy and system mass. The deuteron and gold fragmentation regions in d + Au collisions are in good agreement with proton nucleus data at lower energies.
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