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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Hadron Structure and Spectroscopy I

HK 2.1: Gruppenbericht

Montag, 16. März 2026, 16:15–16:45, PHIL C 301

Accessing transition Generalized Parton Distributions with the N → N^* DVCS and DVMP processes — •Stefan Diehl for the CLAS collaboration — II. Physikalisches Institut, JLU Gießen, Gießen, Germany — University of Connecticut, Storrs, CT, USA

The understanding of the internal structure of baryon resonances is of essential important for many fields of nuclear physics. It is known, that Generalized Parton Distributions (GPDs) are a well established tool for characterizing the QCD structure of the ground-state nucleon based on 3D tomographic images of the quark/gluon structure. Transition GPDs extend these concepts to N → N^* transitions and can be used to characterize the 3D structure and mechanical properties of baryon resonances. They can be probed for example in high-momentum transfer exclusive electroproduction processes with resonance transitions eN^* → e M N^*, such as deeply virtual Compton scattering (M = γ) or meson production (M = π, K ...). Based on the high-intensity, 10.6 GeV electron beam at JLAB and the large acceptance CLAS12 spectrometer, it becomes possible to study these processes in a large kinematic range. The talk will present results of the deeply virtual ep → eΔ⁺⁺π⁻ process, providing a first measurement sensitive to transition GPDs and discuss the feasibility of the study of further N → N^* DVMP processes with CLAS12. Furthermore, first results for beam spin asymmetries of the N → N^* DVCS process (ep → eN^*+γ) will be presented and compared to transition GPD based theory predictions. *The work is partly supported by Deutsche Forschungsgemeinschaft (Project No. 508107918).

Keywords: transition Generalised Parton Distributions; baryon resonances; CLAS12; DVCS; DVMP