Measurement of density correlations in pseudorapidity via charged particle multiplicity fluctuations in Au+Au collisions at sNN=200 GeV

S. S. Adler et al. (PHENIX Collaboration)
Phys. Rev. C 76, 034903 – Published 21 September 2007

Abstract

Longitudinal density correlations of produced matter in Au+Au collisions at sNN=200 GeV have been measured from the inclusive charged particle distributions as a function of pseudorapidity window sizes. The extracted αξ parameter, related to the susceptibility of the density fluctuations in the long-wavelength limit, exhibits a nonmonotonic behavior as a function of the number of participant nucleons, Npart. A local maximum is seen at Npart~90, with corresponding energy density based on the Bjorken picture of εBjτ~2.4 GeV/(fm2c) with a transverse area size of 60 fm2. This behavior may suggest a critical phase boundary based on the Ginzburg-Landau framework.

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  • Received 22 April 2007

DOI:https://doi.org/10.1103/PhysRevC.76.034903

©2007 American Physical Society

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Vol. 76, Iss. 3 — September 2007

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