Effect of correlations on cumulants in heavy-ion collisions

Abstract

We study the effects of correlations on cumulants and their ratios of net-proton multiplicity distributions which have been measured for central (0\%-5\%) Au + Au collisions at the Relativistic Heavy Ion Collider (RHIC). This effect has been studied assuming individual proton and anti-proton distributions as a Poisson or Negative Binomial Distribution (NBD). In-spite of significantly correlated production due to baryon number, electric charge conservation and kinematical correlations of protons and anti-protons, the measured cumulants of the net-proton distribution follow the independent production model. In the present work we demonstrate how the introduction of the correlations will affect the cumulants and their ratios for the difference distributions. We have also demonstrated this study using the proton and anti-proton distributions obtained from the HIJING event generator.

7 pages, 9 figures, accepted for publication in Phys. Rev. C

References in corpus (8)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Probing freeze-out conditions in heavy ion collisions with moments of charge fluctuations
• Freeze-out Conditions in Heavy Ion Collisions from QCD Thermodynamics
• Freeze-out conditions from net-proton and net-charge fluctuations at RHIC
• Freeze-out parameters from electric charge and baryon number fluctuations: is there consistency?
• Measurement of higher cumulants of net-charge multiplicity distributions in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=7.7-200$ GeV
• Baseline for the cumulants of net-proton distributions at STAR
• UrQMD Study of the Effects of Centrality Definitions on Higher Moments of Net Protons at RHIC

Cited by in corpus (5)

• Resonance decay effect on conserved number fluctuations in a hadron resonance gas model
• Cumulants of multiplicity distributions in most-central heavy-ion collisions
• Higher moments of net-proton multiplicity distributions in a heavy-ion event pile-up scenario
• Estimation of Stopped Protons at Energies Relevant for a Beam Energy Scan at the BNL Relativistic Heavy-Ion Collider
• Experimental results on charge fluctuations in heavy-ion collisions