Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Hadron Structure and Spectroscopy VIII

HK 43.2: Vortrag

Mittwoch, 30. März 2022, 14:30–14:45, HK-H9

GPD measurements with PANDA based on antiproton scattering — •Stefan Diehl for the PANDA collaboration — II. Physikalisches Institut, JLU Giessen, Germany

Generalized parton distributions (GPDs) are a well-established tool to study the three-dimensional nucleon structure in terms of the transverse position and the longitudinal momentum component of the partons. Classically, GPDs are measured in hard exclusive lepton scattering processes such as deeply virtual Compton scattering and deeply virtual meson production, which are currently extensively studied at Jefferson Laboratory with experiments such as CLAS12. While PANDA at FAIR has been designed to study antiproton annihilation, which yields access to time-like GPDs, also known as generalized distribution amplitudes (GDAs), it can also be used to study hard exclusive antiproton scattering processes such as p p → p p e⁺ e⁻ and p p → p p µ⁺ µ⁻. Such processes can be theoretically described with a dual handbag approach based on classical GPDs. The talk will present a feasibility study for the measurement of hard exclusive lepton pair production in antiproton scattering with PANDA and discuss its impact on the measurement of GPDs. A special focus will be set on the application of neural networks to optimize the particle ID and background suppression.

*Supported by BMBF within ERUM-FSP T08:PANDA and HFHF.