Multiplicity fluctuations in Au+Au collisions at s(NN)**(1/2) = 130-GeV

The STAR collaboration
Phys.Rev.C 68 (2003) 044905, 2003.

We present the results of charged particle fluctuations measurements in Au + Au collisions at $\sqrt{s_{NN}}=130$ GeV using the STAR detector. Dynamical fluctuations measurements are presented for inclusive charged particle multiplicities as well as for identified charged pions, kaons, and protons. The net charge dynamical fluctuations are found to be large and negative providing clear evidence that positive and negative charged particle production is correlated within the pseudorapidity range investigated. Correlations are smaller than expected based on model-dependent predictions for a resonance gas or a quark gluon gas which undergoes fast hadronization and freeze-out. Qualitative agreement is found with comparable scaled p+p measurements and a HIJING model calculation based on independent particle collisions, although a small deviation from the 1/N scaling dependence expected from this model is observed.

  • Figure 1 (a)


    Dynamical fluctuations, $ν_{+−,dyn}$, measured in $|\eta| ≤ 0.5$ as a function of the collision centrality estimated with the total (uncorrected)...

  • Figure 1 (b)


    $\langle N\rangle ν_{+−,dyn}$ measured in $|\eta| ≤ 0.5$ vs M (opened circles) compared to the charge conservation limit (dotted line),...

  • Figure 2


    Fluctuations $ν_{+−,dyn}$ for the $6\%$ most central collisions as a function of the range of integrated pseudorapidities. The expected limit...

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