München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Heavy-Ion Collisions and QCD Phases VII

HK 35.4: Vortrag

Mittwoch, 20. März 2019, 15:00–15:15, HS 12

Application of the 3-Fluid Hydrodynamic Event Generator THESEUS to CBM — •Elena Volkova for the CBM collaboration — Tuebingen university, Germany

The Compressed Baryonic Matter experiment (CBM) at FAIR will measure nucleus-nucleus collisions at beam energies up to 11 AGeV for Au. The key objective of CBM is to investigate the QCD phase diagram in the region of the highest net-baryon-densities. The experiment is well suited to explore the Equation-of-State of nuclear matter at densities as they might occur in the interior of neutron stars or during neutron star mergers. Recently, a new event generator, THESEUS, has been developed. It is based on the three-fluid hydrodynamics approach for the early stage of the collision, followed by a particlization at the hydrodynamic decoupling surface to join to a microscopic transport model, i.e., UrQMD. This accounts for hadronic final state interactions. The three-fluid approximation is a minimal way to simulate the finite stopping power at the initial stage of the collision. The model incorporates the evolution of three baryon-rich fluids: a target and projectile fluid, and a fluid describing the hot fiereball of participant matter. The generator allows, e.g., to employ different Equations-of-State for the description of nuclear matter. We plan to investigate the physics performance of the CBM detector by testing the sensitivity of various observables (e.g. flow) to different EoS as THESEUS generator input. The first results of the CBM with THESEUS events will be present.