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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Hadron Structure and Spectroscopy VIII

HK 58.1: Gruppenbericht

Mittwoch, 13. März 2024, 17:30–18:00, HBR 62: EG 19

Exploring the 3D structure of baryon resonances with transition Generalized Parton Distributions — •Stefan Diehl for the CLAS collaboration — Justus Liebig Universität Gießen and University of Connecticut

The nucleon consists of three quarks bound by the strong interaction, which is the strongest force in nature. If a lepton is scattered on this object, energy is transferred and can lead to an excited system, known as a baryon resonance. Under certain kinematic conditions, a meson or a photon can be emitted during this process and provide us with information on the 3D distribution of the quarks within the resonance, which is encoded in so-called transition Generalized Parton Distributions (GPDs). The knowledge of these objects can help us to better understand the excitation process itself and to study the mechanical properties of resonances and the connection between the angular momentum of resonances and the distribution and motion of the partons. Based on the high-intensity, 10.6 GeV electron beam at JLAB and the CLAS12 detector, it was possible to study the ep → e Δ⁺⁺π⁻ with a large mass of the virtual photon Q² and with the pion produced under very forward angles, providing a first measurement sensitive to transition GPDs. The talk will present the results from this study as well as the first results from ongoing measurements of the N → N^* deeply virtual Compton scattering (DVCS) process (ep → eΔ⁺ γ) with CLAS12.

*The work is partly supported by Deutsche Forschungsgemeinschaft (Project No. 508107918).

Keywords: electron scattering; generalized parton dsitributions; nucleon resonances