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München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Hadron Structure and Spectroscopy I

HK 3.1: Gruppenbericht

Montag, 18. März 2019, 14:00–14:30, HS 13

Meson transition form factor measurements with A2 — •Lena Heijkenskjöld for the A2 collaboration — Johannes Gutenberg-Universität, Mainz, Germany

A meson transition form factor (TFF) describes the dynamics of the transition between photons and mesons and hence provide an important probe of the intrinsic structure of mesons. High statistics measurements of pseudoscalar TFFs also play a role for the precision frontier of the Standard Model (SM) as they are needed to describe the hadronic Light-by-Light scattering contribution to the SM calculation of the anomalous magnetic moment of the muon. Within the time-like region, the pseudoscalar TFFs can be accessed in decays of π0, η, ω or η′ mesons.

The A2 experiment at the Mainz Microtron 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.

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