May 17 – 22, 2021
US/Eastern timezone

Higher-Order Cumulants of Net-Proton Multiplicity Distributions from RHIC-STAR

May 18, 2021, 11:30 AM
Room A (Zoom)

Room A


zoom co-host: Niveditha Ramasubramanian
Experimental talk Bulk (Fluctuation)


Mr Yu Zhang (Central China Normal University)


In the study of QCD phase structure and search of the QCD phase boundary and critical point, higher-order cumulants of conserved quantities are proposed as promising observables and have been studied extensively both experimentally and theoretically. For $4^{th}$-order cumulants it is predicted that there will be a non-monotonic energy dependence trend. For $5^{th}$- and $6^{th}$-order cumulants results from Lattice calculations suggest that they are connected to the smooth crossover transition at $\mu_{B}$ = 0. At high baryon density region, on the other hand, the higher-order cumulants are also sensitive to the first-order phase boundary.

In this talk, we will present net-proton cumulants up to $6^{th}$-order in Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 7.7 - 200 from STAR Beam Energy Scan phase I and $\sqrt{s}$ = 200 GeV p+p collisions. Analysis update on STAR fixed target energy $\sqrt{s_{\rm{NN}}}$ = 3 GeV will also be shown. Physics implication as well as comparisons with various models will be discussed.

Collaboration STAR Collaboration

Presentation materials