Statistical and dynamical parts of the cumulants of conserved charges in relativistic heavy ion collisions

Abstract

The Poisson-liked statistical fluctuations, which are caused by the finite number of produced particles, are firstly estimated for the cumulants of conserved charges, i.e., the cumulants of net-baryon, net-electric charge, and net-strangeness. They turn out to be the same as those baselines derived from Hadron Resonance Gas (HRG) model. The energy and centrality dependence of net-proton cumulants at the Relativistic Heavy-Ion Collider (RHIC) are demonstrated to be mainly caused by statistical fluctuations. Subtracting the statistical fluctuations, the dynamical kurtosis of net- and total-proton from two versions of the AMPT model and the UrQMD model at current RHIC beam energies are presented. It is found that the observed sign change in the kurtosis of net-proton can not be reproduced by these three transport models. There is no significant difference between net- and total-proton kurtosis in model calculations, in contrary to the data at RHIC.

7 pages, 2 figures

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Cited by in corpus (7)

• Beam-energy dependence of identified two-particle angular correlations in Au+Au collisions at RHIC
• Isolating dynamical net-charge fluctuations
• Measurement of the ratio of the sixth order to the second order cumulant of net-proton multiplicity distributions in relativistic heavy-ion collisions
• Influence of statistics on the measured moments of conserved quantities in relativistic heavy ion collisions
• Statistical method in quark combination model
• High cumulants of conserved charges and their statistical uncertainties
• Poisson baseline of net-charge fluctuations in the relativistic heavy ion collisions