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Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Hadron Structure and Spectroscopy VI

HK 23.2: Gruppenbericht

Mittwoch, 1. April 2020, 14:30–15:00, J-HS M

Meson transition form factor measurements with A2 at MAMIAchim Denig1, Lena Heijkenskjöld1, Sergey Prakhov2, and •Sascha Wagner11Johannes Gutenberg-Universität, Mainz, Germany — 2University of California Los Angeles, USA

A meson transition form factor (TFF) describes the interaction between photons and mesons and hence provides an important probe of the intrinsic electromagnetic structure of mesons. Studies of how the TFF depends on the momentum transfer of the photons, q2, provide a deeper understanding of the dynamics involved. However, only certain q2-regions are accessible experimentally. Within the time-like region (q2 > 0), the TFFs of pseudoscalar mesons can be accessed in decays of π0, η, ω and η′ mesons.

The A2 experiment at the Mainz Microtron (MAMI) provides a high yield of light mesons produced by photo-induced reactions on protons, which makes the experiment ideal for precision measurements of meson TFFs. Both completed and upcoming contributions to such measurements by the A2 collaboration will be presented.

Supported by DFG under contract SFB1044.

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