Quark Matter 2018

Measurement of the Sixth-order Cumulant of Net-charge Distributions in Au+Au Collisions at √sNN = 200 GeV by the STAR Experiment

15 May 2018, 17:00

2h 40m

First floor and third floor (Palazzo del Casinò)

Poster Correlations and fluctuations Poster Session

Speaker

Tetsuro Sugiura (University of Tsukuba, Japan)

Description

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, an analytic cross-over exists at small ${\mu }_B$ 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 the ratio to the variance may be the signal of the cross-over. The STAR experiment presented up to the fourth-order cumulant ratios of net-charge and up to the sixth-order of net-proton fluctuations at $\sqrt{s_{NN}}=200$ GeV. However, the fifth and sixth-order cumulant of net-charge have not been presented yet. This poster presents measurements of cumulants from the first- to sixth-order and the ratio to the variance of net-charge using particle species and $p_T$ dependent efficiency corrections for Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV during Beam Energy Scan in 2010 and 2011.

Presentation materials

tsugiura_QM18poster_v2.pdf