Measurement of the sixth-order cumulant of net-charge distributions in Au+Au collisions at &[root]s_NN =200 GeV by the STAR experiment

In heavy-ion collision experiments, the study of event-by-event fluctuations is a powerful tool to characterize the thermodynamic properties of the hot and dense QCD matter.

According to the Lattice QCD calculations, a cross-over exists at small μ_B regions but there is no experimental evidence for the location of predicted cross-over.

 Experimentally, it is thought that up to the sixth-order cumulant and its ratio to the variance may be the signal of the cross-over.

The STAR experiment published cumulants up to the fourth-order and cumulant ratios on net-charge.

In addition, the fifth- and sixth-order net-charge cumulants at √s_NN = 200 GeV were presented at last Quark Matter for the first time.

This presentation shows updated results of net-charge cumulants from the first- to sixth-order using particle species and p_T-dependent efficiency corrections for Au+Au collisions at √s_NN= 200 GeV during Beam Energy Scan in 2010 and 2011.

We will discuss centrality dependence of cumulants and experimental results will be compared to Poisson, NBD and UrQMD estimations.