Chemical freeze-out parameters via functional renormalization group approach

2023/05/26 by J. Shao, Wei-jie Fu, Shao, Jun-xiang +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2305.16763

openalex publication_date 2023/05/26 · openalex created_date 2023/05/30 · openalex updated_date 2026/07/28

Abstract

We study the freeze-out parameters in a QCD-assisted effective theory that accurately captures the quantum and in-medium effects of QCD at low energies. Functional renormalization group approach is implemented in our work to incorporate the non-perturbative quantum, thermal and density fluctuations. By analyzing the calculated baryon number susceptibility ratios χ₂^B/χ₁^B and χ₃^B/χ₂^B, we determine the chemical freeze-out temperatures and baryon chemical potentials in cases of hard thermal or dense loop improved μ-dependent glue potential and μ-independent glue potential. We calculate the χ₄^B/χ₂^B (κσ²) and χ₆^B/χ₂^B along the freeze-out line for both cases. It's found that κσ² exhibits a nonmonotonic behavior in low collision energy region and approach to one for lower collision energy. χ₆^B/χ₂^B shows a similar complicated behavior in our calculation.

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