Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Heavy-Ion Collisions and QCD Phases VII
HK 33.1: Gruppenbericht
Dienstag, 12. März 2024, 17:30–18:00, HBR 62: EG 05
Production and fluctuation of protons and light nuclear clusters in Ag+Ag reactions measured by HADES — •Marvin Nabroth for the HADES collaboration — Goethe-Universität, Frankfurt, Germany
The HADES (High-Acceptance-Dielectron-Spectrometer) experiment at SIS18/GSI measures the reaction products from heavy-ion collisions at kinetic beam energies around 1A GeV. This allows probing the QCD phase diagram at high net-baryon densities and moderate temperatures. The matter formed in such collisions is believed to reach pressures and temperatures as they are expected to occur in binary neutron star mergers. This group report presents the reconstructed phase space distributions of protons and light nuclei in Ag+Ag collisions at √sNN=2.55 GeV. Furthermore, the focus is put on the analysis of the event-by-event proton (free and bound) multiplicity fluctuations. Covered are techniques for fluctuations analyses based on a Bayesian ansatz (Identity Mehtod), as well as various unfolding methods, employed to account for particle reconstruction inefficiencies. Moreover, the dynamical fluctuations are distorted by the fluctuations of the system size. Hence, a correction procedure that circumvents contributions from the system size fluctuations is also discussed.
Higher-order cumulants of net-baryon number distribution are of particular interest as they are sensitive to the vicinity of a phase transition and the potential critical endpoint.
This work has been supported by BMBF (05P21RFFC2), GSI F&E and HFHF.