The 14th Workshop on QCD Phase Transition and Relativistic Heavy-Ion Physics (QPT 2021)

Higher-order diagonal cumulants of net-Lambda multiplicity distributions and off-diagonal cumulants of net-proton, net-kaon, and net-charge multiplicity distributions in the STAR experiment in Au+Au collisions at $\sqrt \rm s_{NN}$=27 GeV

Not scheduled

15m

Conference Hall (Shangshan Hotel, Building 9)

Speaker

changfeng li (SDU)

Description

Susceptibilities of conserved quantities, such as net-charge, net-baryon, and net-strangeness, are sensitive to the quantum chromodynamics (QCD) phase transition, and also the QCD critical point. The prime aim of the RHIC beam-energy scan program is to explore the QCD phase diagram and search for the location of QCD critical , which can be studied by higher order cumulants of net-proton ($\Delta$p), netcharge ($\Delta$Q), and net-kaon ($\Delta$k) multiplicity distributions. Additionally,the cumulants of net-$\Lambda$($\Delta$$\Lambda$) multiplicity distributions could provide an access to explore flavor-dependent chemical freeze-out parameters in the QCD phase diagram. In the year 2018, the STAR experiment has collected high statistics minimum bias data in Au+Au collisions at = 27 GeV. We present the higher-order diagonal cumulants (1st to 4th order) and their ratios of $\Delta$$\Lambda$ multiplicity distributions. A comparison between higher order cumulants of $\Delta$$\Lambda$ and $\Delta$k multiplicity distributions are discussed. Furthermore, the off-diagonal cumulants between $\Delta$p-$\Delta$k at this collision energy along with other published BES results will be discussed.