We discuss systematic uncertainties in the chemical freeze-out parameters from the χ 2 analysis of hadron multiplicity ratios in the heavy-ion collision experiments. The systematics due to the choice of specific hadron ratios are found to lie within the experimental uncertainties. The variations obtained by removing the usual constraints on the conserved charges show similar behavior. The net charge to net baryon ratios in such unconstrained systems are commensurate with the expected value obtained from the protons and neutrons of the colliding nuclei up to the center of mass energies ∼ 40 GeV. Beyond that the uncertainties in this ratio gradually increases, possibly indicating the reduction in baryon stopping.
We introduce a new prescription for obtaining the chemical freeze-out parameters in the heavyion collision experiments using the Hadron Resonance Gas model. The scheme is found to reliably estimate the freeze-out parameters and predict the hadron yield ratios, which themselves were never used in the parametrization procedure.
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