Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Hadron Structure and Spectroscopy IV

HK 12.6: Talk

Tuesday, March 17, 2026, 18:00–18:15, PHIL A 401

Partial Wave Analysis for Baryonic Resonances for the HADES Experiment — •Ahmed Marwan Foda — GSI Helmholtz Centre for Heavy Ion Research, Darmstadt, Germany

The HADES collaboration at GSI investigates baryonic resonances and their decay channels using exclusive channels with pion and proton beams, which enable direct resonance formation at fixed center-of-mass energy (√s). This approach complements photo-induced studies and, combined with Partial Wave Analysis (PWA), provides crucial insights into resonance couplings, particularly in two- and three-pseudoscalar meson production. A central focus is the role and medium modification of vector mesons in baryon-dense matter, with pion-induced reactions and PWA offering unprecedented access to ρ N and ω N final states, relevant for phenomena such as ρ meson melting and dilepton emissions in heavy-ion collisions.

To advance resonance exploration, a modular PWA software package is being developed, incorporating frameworks such as K-Matrix, N/D methods, and a baryon pseudoscalar fit based on the JuBo coupled-channel model. This enables comparison of electro- and photoproduction predictions with proton-proton data, refining resonance contributions. The effort coincides with recently analyzed proton-induced data together with approved pion beam time at GSI targeting the third resonance region, and a complementary experiment at J-PARC. Current results include illustrative fits from pion-proton reactions in the second resonance region, and proton-proton reactions at 4.5 GeV, demonstrating the framework’s potential for upcoming campaigns.

Keywords: Baryons; Partial Wave Analysis; Experimental; Hadrons; Resonance