Higher Moments of Net-Baryon Distribution as Probes of QCD Critical Point

Understand

It is crucially important to find an observable which is independent on the acceptance and late collision process, in order to search for the possible Critical Point predicted by QCD.

• By utilizing A Multi-Phase Transport (AMPT) model and Ultra Relativistic Quantum Molecular Dynamics (UrQMD) model, we study the centrality and evolution time dependence of higher moments of net-baryon distribution in Au + Au collisions at $\sqrt{s_{NN}}=17.3$ GeV.
• The results suggest that Kurtosis and Skewness are less sensitive to the acceptance effect and late collision process.
• Thus, they should be good observables providing the information of the early stage of heavy ion collision.