Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Focus Session II: Emergence of Collectivity in Few-Body Hadron Systems

HK 36.2: Hauptvortrag

Mittwoch, 13. März 2024, 14:30–15:00, HBR 14: HS 1

Multi-particle correlations: from hot-and-dense quark-gluon matter to an ultracold-and-dilute system with few atoms — •Ilya Selyuzhenkov — GSI, Darmstadt

Multi-particle azimuthal correlations proved to be a powerful tool to study the hydrodynamic flow of the quark-gluon matter created in heavy-ion collisions and probe the collective behaviour in proton-proton interactions. Recently azimuthal correlations were used to search for collectivity in an even smaller hadronic system created in the ep and e+e- interactions. Experiments with ultracold atoms also revealed collective behaviour in a macroscopic system, and recently for a system with only a few atoms. These experiments have unique control over initial conditions and access to the time evolution, which opens a possibility to apply the existing correlation techniques to the cold-atom data and develop new observables, which could be later applied in heavy-ion experiments.

In this talk, after a brief introduction to the multi-particle azimuthal correlation techniques, the recent results for different hadronic collisions will be reviewed. A feasibility study of the two-particle correlations and the first application of the heavy-ion flow measurement techniques to extract time evolution of the spatial eccentricity and the elliptic flow in a system of 5+5 lithium atoms imaged at different expansion times will also be presented. An outlook towards the multi-differential analysis of the time evolution of the short- and long-range correlations to obtain new insights about collective phenomena and the equation of state for a few-body system will be discussed.