부산대학교 도서관

Utilizing the Modified Hagedorn function with embedded flow, we analyze the transverse momenta ( p T ) and transverse mass ( m T ) spectra of π + in Au–Au, Cu–Cu, and d–Au collisions at s N N = 200 GeV across various centrality bins. Our study reveals the centrality and system size dependence of key freezeout parameters, including kinetic freezeout temperature (T 0) , transverse flow velocity (β T) , entropy-related parameter (n) , and kinetic freezeout volume (V). Specifically, T 0 and n increase from central to peripheral collisions, while β T and V show the opposite trend. These parameters also exhibit system size dependence; T 0 and β T are smaller in larger collision systems, whereas V is larger. Importantly, central collisions correspond to a stiffer Equation of State (EOS), characterized by larger β T and smaller T 0 , while peripheral collisions indicate a softer EOS. These insights are crucial for understanding the properties of Quark–Gluon Plasma (QGP) and offer valuable constraints for Quantum Chromodynamics (QCD) models at high temperatures and densities. [ABSTRACT FROM AUTHOR]