Measurement of cumulants of conserved charge multiplicity distributions in Au+Au collisions from the STAR experiment

Abstract

We report the collision-centrality dependence of cumulants of event-by-event net-proton, net-charge and net-kaon distributions in Au+Au collisions for center-of-mass energy $\sqrt{s_{NN}}$ = 54.4 GeV from the STAR experiment. Strong collision-centrality dependence is observed for cumulants ($C_n,n$ $\le$ 4) of the net-particle distributions. The cumulant ratios $C_3/C_2$, $C_4/C_2$ and $C_6/C_2$ exhibit a weak collision-centrality dependence. The $C_6/C_2$ of net-proton and net-charge distributions for most central gold nuclei collisions at $\sqrt{s_{NN}}$ = 54.4 GeV show positive sign while they remain negative at 200 GeV for the same collision system. To understand effects of acceptance and baryon number conservation, the measurements are compared to expectations from the UrQMD and HIJING models calculated within the STAR detector acceptance.

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• Hyper-order baryon number fluctuations at finite temperature and density
• A Study of the Properties of the QCD Phase Diagram in High-Energy Nuclear Collisions
• New developments in lattice QCD on equilibrium physics and phase diagram
• Net-baryon number fluctuations
• Dynamical development of proton cumulants and correlation functions in Au+Au collisions at $\sqrt{s_{NN}}=7.7$ GeV from a multiphase transport model
• Overview of fluctuation and correlation measurements
• Study on higher moments of net-charge multiplicity distributions using a multiphase transport model
• Chemical Freeze-out Parameters via a Non-perturbative QCD Approach
• Probing fluctuations and correlations of strangeness by net-kaon cumulants in Au+Au collisions at $\sqrt{s_{NN}}=7.7$ GeV
• Corrections to the hadron resonance gas from lattice QCD and their effect on fluctuation-ratios at finite density