Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Hadron Structure and Spectroscopy III

HK 11.3: Talk

Tuesday, March 17, 2026, 17:15–17:30, PHIL C 301

Production Mechanism Studies of the N^* and Δ Resonances in Proton-Proton Collisions — •Saket Kumar Sahu^1,2, Ahmed Marwan Foda², Johan Messchendorp², James Ritman^1,2,3, and Deborah Rönchen³ — ¹Ruhr University Bochum — ²GSI Helmholtzzentrumfür Schwerionenforschung GmbH — ³Forschungszentrum Jülich

Excited nucleon states (N^* and Δ resonances) help us to probe the non-perturbative regime of Quantum Chromodynamics (QCD) and baryon structure. One way to access their internal properties is through their coupling to virtual photons produced in elementary reactions. Our long-term goal is to study Dalitz transitions of N^* and Δ resonances generated in proton-proton collisions. In this work, we study the production mechanisms of these resonances which will also serve as a baseline measurement for interpreting data from heavy-ion collisions. The High Acceptance Di-Electron Spectrometer (HADES) at GSI Darmstadt, which is a versatile magnetic spectrometer designed for measuring wide range of particles across large angular acceptance, 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 and also their coupling strengths in proton-proton collisions. This talk will present results of the analysis of proton-proton scattering data collected in February 2022 by the HADES collaboration, along with preliminary comparisons to fits using the Jülich*Bonn (JüBo) dynamical coupled*channel model.

Keywords: N and $\Delta$ Baryon Resonances; Production Mechanism; Dynamic Coupled Channel; proton proton collision; HADES