The Effect of Light Nuclei on Chemical Freeze-out Parameters at RHIC Energy

This study examines the chemical freeze-out of hadrons, encompassing light-flavor, strange-flavor, and light nuclei produced in Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC). By conducting a thermal analysis of hadron yields with and without the inclusion of light nuclei yields, we observe a discernible decrease in the chemical freeze-out temperature Tch when light nuclei yields are considered. This suggests that light nuclei formation occurs at a later stage of the system evolution. Furthermore, the Tch associated with strange-flavor particles is found to be approximately $20-30$ MeV higher than that for light-flavor particles and light nuclei, hinting at the existence of multiple freeze-out hyper-surfaces for different hadron types in heavy-ion collisions. We present parameterized formulas that describe the energy dependence of Tch and μB for four distinct particle sets in central Au+Au collisions. These formulas allow for the selection of appropriate parameters tailored to specific studies, facilitating a more nuanced understanding of the freeze-out process.