Energy and Centrality Dependence of Rapidity Densities at RHIC Energies

Xin-Nian Wang and Miklos Gyulassy
Phys. Rev. Lett. 86, 3496 – Published 16 April 2001
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Abstract

The energy and centrality dependence of the charged multiplicity per participant nucleon is shown to be able to differentiate between final state saturation and fixed scale perturbative QCD models of initial entropy production in high-energy heavy-ion collisions. The energy dependence is shown to test the nuclear enhancement of the minijet component of the initial conditions, while the centrality dependence provides a key test of whether gluon saturation is reached at RHIC energies. The HIJING model predicts that the rapidity density per participant increases with centrality, while the saturation model prediction is essentially independent of centrality.

  • Received 11 August 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.3496

©2001 American Physical Society

Authors & Affiliations

Xin-Nian Wang

  • Nuclear Science Division, Mailstop 70-319, Lawrence Berkeley National Laboratory, Berkeley, California 94720

Miklos Gyulassy

  • Department of Physics, Columbia University, 538 W. 120th Street, New York, New York 10027

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Vol. 86, Iss. 16 — 16 April 2001

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