More uses for Thermal Models

Abstract

We explore combinations of particle and anti-particle yields which can be used to test thermal models in a parameter free way. We also explore combinations which can be used to extract $μ_B/T$, $μ_S/T$ and $μ_Q/T$. We use experimentally measured particle-antiparticle specific ratios for proton $p$, Lambda $Λ$, and cascade $Ξ$, for $\sqrt{s_{NN}}=$ 7.7-39 GeV from RHIC BES phase-1 to extract the $μ_{B,S,Q}/T$. These compared well with published STAR freeze-out parameters. These combinations are verified to predict a similar combination of $Ω$ yields. We also extend this idea to predict (anti-)nuclei yields at energies where they are not measured. We also update parametrizations for the $\sqrt{s_{NN}}$ dependence of freeze-out parameters $T$ and $μ_B$, and present for the first time a similar parametrization of $μ_S$.