Influence of modified (non-)strange hadron spectra on statistical hadronization model calculations

A major interest in heavy-ion collisions is the investigation of the QCD phase transition from a Quark-Gluon Plasma to hadronic matter. One tool to study this phase transition is the statistical hadronization model. It describes the produced hadron densities in the fireball using a (thermal) fit to hadron yields with only a few parameters and has shown to be successful over a broad range of collision energies up to lead-lead collisions at the LHC. The results of the thermal fits depend on the included hadron spectrum. In this contribution, the impact is studied considering additional (non-)strange hadron states predicted by LQCD or the constituent quark model, particularly regarding deviations in the proton yields seen in earlier fits to LHC data. It is shown that this problem cannot be solved by adding further hadron states but that, in fact, these states lead to a massive deterioration of the fit. This is interpreted by applying a correction, making use of the description of statistical mechanics in terms of the S-matrix.