Abstract
It has been demonstrated that Statistical Hadronization Model fits perfectly to particle yields at freeze-out in heavy-ion and hadron collisions at LHC, RHIC and SPS, where quark-gluon plasma is created. It is however entirely not clear if particles emitted in the few-GeV energy regime can be understood as emerging from thermalized hadronic medium. Our recent work suggests that this might be the case. By implementing appropriate fireball geometry and expansion pattern in the THERMINATOR (THERMal heavy IoN generATOR) it was possible to describe not only yields, but also the spectra of most abundant particles measured at GSI SIS18. Most of the latter are pure prediction of the model. We present details of the model and extended comparison with experimental data and discuss further developments.
Highlights
Models based on statistical hadronization have been very successful in describing over many orders of magnitude the multiplicities of hadrons produced in different collision processes, in particular in heavy-ion collisions (HICs), see e.g. [1] and references therein
This is possible with just a few free thermodynamic parameters, whose fitted values allow to relate collision energy and system size to the location in the QCD phase diagram
The assumption of local thermodynamic equilibrium makes it possible to use concepts originating from fluid dynamics to describe the evolution of hot and dense fireball of QCD matter produced in HICs
Summary
Models based on statistical hadronization have been very successful in describing over many orders of magnitude the multiplicities of hadrons produced in different collision processes, in particular in heavy-ion collisions (HICs), see e.g. [1] and references therein. [1] and references therein This is possible with just a few free thermodynamic parameters (temperature, fugacities, system’s volume), whose fitted values allow to relate collision energy and system size to the location in the QCD phase diagram. The assumption of local thermodynamic equilibrium makes it possible to use concepts originating from fluid dynamics to describe the evolution of hot and dense fireball of QCD matter produced in HICs. Collisions at energy of few GeV probe the phase diagram region of moderate temperature (tens of MeV) and high baryochemical potential μB (close to the nucleon mass). Collisions at energy of few GeV probe the phase diagram region of moderate temperature (tens of MeV) and high baryochemical potential μB (close to the nucleon mass) It is debated if at such collision energies matter does reach local thermal equilibrium. A possible way to test this is to compare the kinematic distributions of particles predicted by the thermal model accompanied with hydro-inspired description of the fireball expansion to experimental results
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