THERMINATOR model is a Monte Carlo event generator invented to study the statistical production of particles created in relativistic heavy-ion collisions. Its current description allows one to study the highest collision energies achieved by LHC and RHIC colliders. However, it is possible to adapt THERMINATOR model to lower energy spectrum as is studied in Beam Energy Scan (BES) program at RHIC. Femtoscopy of two particles investigates the properties of matter produced in heavy-ion collisions. Two-particle correlations use Quantum Statistics and the Final State Interactions which allow one to examine the space-time characteristics of the medium. For the first time we present single- and two-particle momentum distributions of identified particles from THERMINATOR model for BES energy spectrum. To verify how model predictions agree with experimental results, we compare transverse momentum distributions of pions, kaons and protons and correlation functions of identical pions in Au+Au collisions to the BES program results from the STAR experiment.
Geometry and dynamics of the source produced as a results of heavy-ion collisions at high energies can be studies via femtoscopy method. Correlations of two particles at small relative momentum are sensitive to the effects of Quantum Statistics and the Final State Interactions. They allow one to study the space-time properties of the source which are of the order of 1015 m and 10−23 s, respectively. Beam Energy Scan (BES) program conducted at the Relativistic Heavy Ion Collider (RHIC) covers an important part of the QCD Phase Diagram with beams of Au ions accelerated to relativistic velocities. Already completed first phase of the BES program uses heavy-ions collided in the energy range measured in the reference frame of center of mass from 7.7 to 200 GeV. This is a baryon-rich region that can be studied via femtoscopy methods with baryons. On one hand meson-meson correlations are the most commonly studied and baryon-baryon systems together with two-meson and meson-baryon correlations provide a complete information about source parameters. On the other hand the measurements of non-identical particle combinations complement our knowledge about space-time asymmetries during emission process. Physics of heavy-ion collisions is successfully deduced basing on studies of the properties of the particle-emitting source and how they change with different collision energies. Such studies include various centralities of the collision. In this paper, the STAR preliminary results including femtoscopic systems of various particle combinations such as protons, pions and kaons produced as a results of Au+Au collisions at BES energies are discussed.
Phenomenological models are used in simulations of heavy-ion collisions. They are based on Monte Carlo methods. One of these models is Therminator. In order to adapt THERMINATOR to energies from the Beam Energy Scan Program, some input parameters of the generator need to be estimated.
Femtoscopy of two particles gives information about space-time characteristics of the source. To check compatibility between the experimental data and the data from the THERMINATOR correlation functions are calculated and the source sizes for identical pion are determined. The sizes calculated for various energies from the STAR experiment are compared with the STAR experimental data.
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