Energy Dependence of High Moments for Net-proton Distributions

Understand

High moments of multiplicity distributions of conserved quantities are predicted to be sensitive to critical fluctuations.

• To understand the effect of the complicated non-critical physics backgrounds on the proposed observable, we have studied various moments of net-proton distributions with AMPT, Hijing, Therminator and UrQMD models, in which no QCD critical point physics is implemented.
• It is found that the centrality evolution of various moments of net-proton distributions can be uniformly described by a superposition of emission sources.
• In addition, in the absence of critical phenomena, some moment products of net-proton distribution, related to the baryon number susceptibilities ratio in Lattice QCD calculation, are predicted to be constant as a function of the collision centrality.