Evaluations of freeze-out parameters from $\frac{d{E}_T}{d\eta }\mathrm{/}\frac{d{N}_{ch}}{d\eta }$ ratio measured at RHIC and SPS

In the presented paper curves of constant ${ϵ}_T\mathrm{/}{n}_{charged}$ are calculated in $T-{\mu }_B$ plane, in the framework of a single-freeze-out thermal hadron gas model. The ratio is a theoretical equivalent of ${{dE_{T}} \over {d\eta}}{\mid \eta=0} / {{dN{ch}} \over {d\eta}}{\mid \eta=0}$measuredatRHICandSPS\mathrm{.}Inboth$\epsilon{T}$and$n_{charged}$ decays of hadron resonances are taken into account. The freeze-out temperature $T_{f\mathrm{.}o\mathrm{.}}=156_{-11}^{+14}$ MeV is obtained for RHIC, whereas $T_{f\mathrm{.}o\mathrm{.}}=134-140$ MeV is evaluated for SPS.