Deconfinement and Freezeout Boundaries in Equilibrium Thermal Models

Abdel Nasser Tawfik,A H El-Kateb,Sara Abdelaziz,Muhammad Maher

doi:10.1155/2020/2453476

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). 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.

Highlights

Interacting matter under extreme conditions is characterized by different phases and different types of phase transitions [1]
The present script focuses on the temperature-baryon density plane, concretely near the hadron-quark-gluon plasma (QGP) boundaries, in the framework of the equilibrium thermal model [7]
For the freezeout parameters Tχ, μb, μS, etc., the thermodynamic quantities fulfill one of the freezeout conditions reviewed in Refs. [16, 21], such as constant entropy density normalized to temperature cubed

Summary

Introduction

Interacting matter under extreme conditions is characterized by different phases and different types of phase transitions [1]. The present script focuses on the temperature-baryon density plane, concretely near the hadron-QGP boundaries, in the framework of the equilibrium thermal model [7]. To this end, we put forward a basic assumption that both directions, the hadron-QGP and QGP-hadron phases are quantummechanically allowed [8]. Advances in High Energy Physics work well near both deconfinement and chemical freezeout boundaries [2, 9] This could be understood in the light of the thermal nature of an arbitrary small part of the highly entangled fireball states.

Equilibrium Thermal Models

Results

Conclusions and Outlook