Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Hadron Structure and Spectroscopy II

HK 18.5: Talk

Tuesday, March 11, 2025, 17:00–17:15, HS 3 Physik

Partial Wave Analysis for Pion-Induced Resonance Studies in the HADES Experiment — •Ahmed Marwan Foda for the HADES collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Deutschland

The High Acceptance Di-lepton Spectrometer (HADES) collaboration at GSI uses a pion-beam to examine baryonic resonances and their decay channels. This pion-beam facility enables baryonic resonance production at a fixed center of mass energy (√s) in the s-channel, offering a key advantage over proton-induced reactions and complementing photo-induced studies conducted elsewhere. Partial Wave Analysis (PWA) techniques explore resonance couplings to various final states. HADES focuses on studying vector mesons’ role and medium modification in heavy-ion collisions within baryon-dense matter. Elementary pion-induced studies on the proton combined with PWA provide deeper insights into baryonic resonance couplings to ρ N and ω N final states, shedding light on the ρ meson melting in heavy-ion collisions and intermediary vector mesons’ role in dilepton emissions.
To support broader studies of the resonance regions in pion-proton collisions, a new K-Matrix & ND framework is under development, offering refined resonance mapping. Example fits will showcase its current status and potential.

Keywords: Baryon Spectroscopy; Hadronic Beam; Partial Waves Analysis; Third resonance region; Transition Form Factors