Measurement of the Sixth-Order Cumulant of Net-Proton Distributions in Au+Au Collisions from the STAR Experiment

Abstract

Higher-order cumulants of the net-baryon multiplicity distributions are predicted to be sensitive to the properties of the nuclear matter created in high-energy nuclear collisions. In this talk, we present the collision centrality and acceptance (rapidity and transverse momentum) dependence of the ratio of the 6${}^{\mathrm{th}}$- to the 2${}^{\mathrm{nd}}$-order cumulant ratio ($C_6/C_2$) of net-proton in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=54.4$ and 200 GeV measured by the STAR detector at RHIC. The new results are compared to hadron transport model and lattice QCD calculations.

4 pages, 2 figure, Quark Matter 2019 proceedings

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• The sixth order cumulant of net-proton number in Binomial distribution at $\sqrt{s_{NN}}=$ 200 GeV
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• Corrections to the hadron resonance gas from lattice QCD and their effect on fluctuation-ratios at finite density