Dariusz Prorok

Influence of correlations between yields on the chemical freeze-out temperature (part II)

The statistical (thermal) model is applied for the description of hadron yields measured at central nucleus-nucleus collisions at the top RHIC energy $sqrt{s_{NN}} = 200$ GeV and the LHC energy $sqrt{s_{NN}} = 2.76$ TeV. In contrast to previous analyzes the more general form of the least squares test statistic is used, which takes into account also possible correlations between different species of yields. When light nuclei are included into fits, the chemical freeze-out temperature about 158 MeV is obtained for both energies (156 MeV when correlations are neglected). Without light nuclei the temperature about 160 MeV is determined for LHC and RHIC when correlations are non-zero, whereas for zero correlations the difference in the chemical freeze-out temperatures between RHIC and LHC is 6 MeV.