2013/08/14 by L. Kumar, Kumar, Lokesh
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.1308.3041
openalex publication_date 2013/08/14 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/28
One of the main goals of heavy-ion collision experiments is to study the\nstructure of the QCD phase diagram. The QCD phase diagram is typically plotted\nas temperature (T) vs. baryon chemical potential (\μB). The statistical\nthermal model THERMUS compared to experimental data provides chemical\nfreeze-out parameters such as temperature, baryon chemical potential and\nstrangeness saturation factor (\γs). However, the values of these\nparameters depend on models and their underlying assumptions, such as the\nnature of the ensemble used, particle ratios vs. particle yields, and the\ntreatment of feed-down contributions to particle yields. In these proceedings,\nwe report on a systematic study of chemical freeze-out parameters using\nTHERMUS, as a function of collision centrality and collision energies\n(\√sNN =7.7-200 GeV). These studies are performed with the string\nmelting version of A Multi-Phase Transport (AMPT) model. A comparison is\npresented of freeze-out parameters between grand-canonical vs. strangeness\ncanonical ensembles, particle yields vs. ratios, with and without feed-down\ncontributions to the particle yields. The main aim is to evaluate the\nsensitivity of the thermal model fits to various model assumptions. This is an\nimportant study for understanding corresponding experimental results from the\nbeam energy scan program at RHIC.\n