Scaling properties in bulk and p${}_{\mathrm{T}}$-dependent particle production near midrapidity in relativistic heavy ion collisions

Abstract

The centrality dependence of the midrapidity charged-particle multiplicity density ($|\eta |$$<$1) is presented for Au+Au and Cu+Cu collisions at RHIC over a broad range of collision energies. The multiplicity measured in the Cu+Cu system is found to be similar to that measured in the Au+Au system, for an equivalent N${}_{\mathrm{part}}$, with the observed factorization in energy and centrality still persistent in the smaller Cu+Cu system. The extent of the similarities observed for bulk particle production is tested by a comparative analysis of the inclusive transverse momentum distributions for Au+Au and Cu+Cu collisions near midrapidity. It is found that, within the uncertainties of the data, the ratio of yields between the various energies for both Au+Au and Cu+Cu systems are similar and constant with centrality, both in the bulk yields as well as a function of p${}_{\mathrm{T}}$, up to at least 4 GeV/$c$. The effects of multiple nucleon collisions that strongly increase with centrality and energy appear to only play a minor role in bulk and intermediate transverse momentum particle production.

Submitted for publication in Phys. Rev. C, 5 pages, 3 figures

References in corpus (2)

• System Size, Energy and Centrality Dependence of Pseudorapidity Distributions of Charged Particles in Relativistic Heavy Ion Collisions
• Vertex Reconstruction Using a Single Layer Silicon Detector

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