SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Heavy-Ion Collisions and QCD Phases VI
HK 28.2: Vortrag
Mittwoch, 22. März 2023, 14:30–14:45, SCH/A315
Mapping the quark-gluon plasma properties in Pb-Pb and Xe-Xe collisions at the LHC with FluiduM — •Luuk Vermunt1,2, Yannis Seeman1, Lukas Kreis2, Christian Sonnabend1, Andrea Dubla2, Ilya Selyuzhenkov2, and Silvia Masciocchi1,2 — 1Physikalisches Institut, Heidelberg, Deutschland — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Deutschland
Fundamental properties of strongly-interacting matter under extreme conditions become accessible with ultra-relativistic collisions of heavy ions. We will present a phenomenological analysis of the experimental data for transverse momentum spectra of identified charged hadrons and (multi-)strange hyperons in Pb-Pb and Xe-Xe collisions at the LHC. The analysis is based on the relativistic fluid dynamics description implemented in the numerically efficient FluiduM approach. We separate in our treatment the chemical and kinetic freeze out, and incorporate the partial chemical equilibrium to describe the late stages of the collision evolution. We determine key parameters of the quark-gluon plasma evolution and its properties including the shear and bulk viscosity to entropy ratios, the initialisation time, initial density, and freeze-out temperatures. The physics parameters and their posterior probabilities are extracted using global search in multidimensional space with modern Machine Learning tools, such as ensembles of neural networks.