Scaling of Charged Particle Production in d+Au Collisions at sqrt(s_NN) = 200 GeV

Abstract

The measured pseudorapidity distributions of primary charged particles over a wide pseudorapidity range of |eta| < 5.4 and integrated charged particle multiplicities in d+Au collisions at sqrt(s_NN) = 200 GeV are presented as a function of collision centrality. The longitudinal features of d+Au collisions at sqrt(s_NN) = 200 GeV are found to be very similar to those seen in p + A collisions at lower energies. The total multiplicity of charged particles is found to scale with the total number of participants according to N^{dAu}_{ch} = 1/2 <N_{part}> N^{pp}_{ch} and the energy dependence of the density of charged particles produced in the fragmentation region exhibits extensive longitudinal scaling.

5 pages, 4 figures, Submitted to Phys.Rev.Lett

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