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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Heavy-Ion Collisions and QCD Phases IV
HK 19.1: Vortrag
Dienstag, 11. März 2025, 15:45–16:00, HS 3 Chemie
Characterising the hot and dense fireball with virtual photons at HADES — •Niklas Schild for the HADES collaboration — TU Darmstadt
The High-Acceptance-Di-Electron-Spectrometer (HADES) at GSI, Darmstadt, measures heavy-ion and elementary collisions at a few GeV beam energies, enabling the investigation of nuclear matter at high densities and moderate temperatures. One central pillar of HADES is the study of these collisions via rare electromagnetic probes, as their penetrating nature allows unique insights into the evolution of the collision throughout.
In this contribution, we present measurements of dileptons reconstructed from Ag+Ag and Au+Au collisions at √sNN=2.55 GeV and √sNN=2.42 GeV. Combination of these HADES data sets brings a unique opportunity to gain new insights into dilepton observables and their dependence on system size and centrality. For this purpose, we also employ a machine-learning approach, based on real data training, to identify and remove carbon collision contamination from the surrounding target material. This allows to extent previous studies to more peripheral collisions.
The main focus of this investigation is then set on the excess yield, and thereby the temperature of the fireball, as well as studies on collectivity, in particular via the measurement of the azimuthal anisotropy.
This work has been supported by ELEMENTS (500/10.006) and HGS-HIRe.
Keywords: HADES; GSI; Dilepton; Electromagnetic; Heavy-ion Collisions