Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Hadron Structure and Spectroscopy II

HK 18.4: Talk

Tuesday, March 11, 2025, 16:45–17:00, HS 3 Physik

"Production Mechanism Studies of the N^* and Δ Resonances in Proton-Proton Collisions" — •Saket Kumar Sahu¹, Johan Messchendorp³, and James Ritman^1,2,3 for the HADES collaboration — ¹Ruhr-Universität Bochum — ²Forschungszentrum Jülich — ³GSI Helmholtzzentrum fur Schwerionenforschung GmbH

The electromagnetic properties of (excited) hadrons can be investigated through the production of virtual photons in elementary reactions. Our goal is to study Dalitz transitions of N^* and Δ resonances generated in proton-proton collisions. The key challenge is to first understand the production mechanisms of these resonances. A comprehensive understanding of the production mechanisms in elementary reactions will also serve as a crucial reference for interpreting data from heavy-ion collisions. The High Acceptance Di-Electron Spectrometer (HADES) at GSI Darmstadt is a versatile magnetic spectrometer designed for measuring wide range of charged particle final states across large angular acceptance and is ideal for performing these studies. This analysis aims to extract differential cross-sections for the exclusive production of N^* and Δ channels in proton-proton collisions at √s = 3.47 GeV. The data will serve as a good basis to rigorously study the production mechanisms by a detailed comparison with theory calculations. This talk will focus on the initial results of the analysis of proton-proton scattering data collected in February 2022 by the HADES collaboration.

Keywords: Radiative Transition; N and Δ Baryon Resonances; Production Mechanism; proton proton collision; HADES