Measurement of density correlations in pseudorapidity via charged particle multiplicity fluctuations in Au+Au collisions at sqrt(s_NN)=200 GeV

Abstract

Longitudinal density correlations of produced matter in Au+Au collisions at sqrt(s_NN)=200 GeV have been measured from the inclusive charged particle distributions as a function of pseudorapidity window sizes. The extracted αξparameter, related to the susceptibility of the density fluctuations in the long wavelength limit, exhibits a non-monotonic behavior as a function of the number of participant nucleons, N_part. A local maximum is seen at N_part ~ 90, with corresponding energy density based on the Bjorken picture of ε_Bj τ~ 2.4 GeV/(fm^2 c) with a transverse area size of 60 fm^2. This behavior may suggest a critical phase boundary based on the Ginzburg-Landau framework.

arXiv comment331 authors, 32 pages text, RevTeX4, 7 figures, 27 tables. Submitted to Physical Review C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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• Small x physics and RHIC data
• Long range rapidity correlations as seen in the STAR experiment
• Fluctuation Probes of Early-Time Correlations in Nuclear Collisions
• Prospects of searching for (un)particles from Hidden Sectors using rapidity correlations in multiparticle production at the LHC
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• Long range correlations, event simulation and parton percolation
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• A critical review of RHIC experimental results
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• Understanding the negative binomial multiplicity fluctuations in relativistic heavy ion collisions
• Searching for minimum in dependence of squared speed-of-sound on collision energy
• Multiplicity distributions in gravitational and strong interactions
• Saturation in nuclei