Deconfinement and Freezeout Boundaries in Equilibrium Thermal Models

Abstract

In different approaches, the temperature -baryon density plane of QCD matter is studied for deconfinement and chemical freezeout boundaries. Results from various heavy-ion experiments are compared with the recent lattice simulations, the effective QCD-like Polyakov linear-sigma model, and the equilibrium thermal models. Along the entire freezeout boundary, there is an excellent agreement between the thermal model calculations and the experiments. Also, the thermal model calculations agree well with the estimations deduced from the Polyakov linear-sigma model (PLSM) [1]. At low baryonic density or high energies, both deconfinement and chemical freezeout boundaries are likely coincident and therefore the agreement with the lattice simulations becomes excellent as well, while at large baryonic density, the two boundaries become distinguishable forming a phase where hadrons and quark-gluon plasma likely coexist.

An almost-entirely precise empirical estimation for various chemical potentials

“…A precise estimation for the baryon chemical potential is crucial, especially for mapping out the QCD phase diagram [8,9]. Ton this end, the conventional method is the one based on a statistical correspondence between multiplicities of the particles produced from high-energy collisions and thermodynamic quantities estimated in theoretical approaches [10,11], such as the statistical thermal models [12], namely the particle number and their ratios [8,[13][14][15][16][17][18]. Recently, an almost-entirely empirical estimation for the full chemical potential has been proposed [19].…”