PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Heavy Ions
Geometry and Dynamics in Heavy-ion Collisions Seen by the Femtoscopy Method in the STAR experiment
H. Zbroszczyk
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Pre-published on: January 15, 2021
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Geometry and dynamics of the source produced due to heavy-ion collisions at high energies can be studied via the femtoscopy method. Correlations of two particles at small relative momentum are sensitive to Quantum Statistics and the Final State Interactions. They allow one to study the source's space-time properties, which are of the order of $10^{-15}$ m and $10^{-23}$ s, respectively. Beam Energy Scan (BES) program conducted at the Relativistic Heavy Ion Collider (RHIC) covers an essential part of the QCD Phase Diagram with beams of Au ions accelerated to relativistic velocities. Already completed, the first phase of the BES program uses heavy-ions collided in the energy range \sqrt{s_{NN}} from 7.7 to 200 GeV. It is a baryon-rich region that can be studied via femtoscopy methods with baryons.
On the one hand, meson-meson correlations are the most commonly studied, and baryon-baryon systems, together with two-meson and meson-baryon correlations, provide complete information about source parameters.
On the other hand, non-identical particle combination measurements complement our knowledge about space-time asymmetries during the 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 from Au+Au collisions at BES energies, are discussed.
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