Chemical Freeze-out Parameters via a Non-perturbative QCD Approach

Abstract

By analyzing the calculated baryon number susceptibility ratios χ B 1 /χ B 2 and χ B 3 /χ B 1 in two-flavor system via the Dyson-Schwinger equation approach of QCD, we determine the chemical freeze-out temperature and baryon chemical potential in cases of both thermodynamic limit and finite size. We calculate the center-of-mass energy dependence of the χ B 4 /χ B 2 (κσ 2 ) at the freeze-out line and find an excellent agreement with experimental data when taking into account the finite size effect. Our calculations indicate that the κσ 2 exhibits a nonmonotonic behavior in lower collision energy region. We also predict that the collision energy dependence of χ B 6 /χ B 2 is nonmonotonic.

Analyzing Transverse Momentum Spectra by a New Method in High-Energy Collisions

“…In the multi-source thermal model [37], in high energy collisions, we assume that two participant partons take part in the formation of a given particle. The transverse momentum p T 1 (p T 2 ) of the first (second) participant parton is assumed to obey Equation (2). That is, we have the probability density function…”

“…Finally, the particles fly to the detector and their properties are measured. The temperature at the stage of chemical freeze-out is called the chemical freeze-out temperature (T ch ) [1][2][3], and the stage of kinetic freeze-out is known as the kinetic freeze-out temperature (T 0 or T kin ).…”

Analyzing transverse momentum spectra by a new method in high-energy collisions

“…In the multi-source thermal model [37], in high energy collisions, we assume that two participant partons take part in the formation of a given particle. The transverse momentum p T1 (p T2 ) of the first (second) participant parton is assumed to obey Equation (2). That is, we have the probability density function…”

“…Finally, the particles fly to the detector and their properties are measured. The temperature at the stage of chemical freeze-out is called the chemical freeze-out temperature (T ch ) [1,2,3], and the stage of kinetic freeze-out is known as the kinetic freeze-out temperature (T 0 or T kin ).…”