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
χ2B​/χ1B​ and χ3B​/χ2B​, 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
χ4B​/χ2B​(κσ2) and
χ6B​/χ2B​ 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.
χ6B​/χ2B​ shows a similar complicated behavior in our
calculation.Comment: 14 pages, 11 figures, 7 table