Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Hadron Structure and Spectroscopy III

HK 16.4: Talk

Tuesday, February 27, 2018, 15:00–15:15, HZO 50

π⁰ transition form factor measurement with A2 — •Lena Heijkenskjöld for the A2 collaboration — Institute for Nuclear Physics, JGU Mainz

Meson transition form factors (TFFs) describe the dynamics of the transition between photons and hadrons and hence provide a probe of the intrinsic structure of hadrons. Within the singly-virtual time-like region, the TFF of the π⁰ meson can be accessed via the Dalitz decay process π⁰ → γ e⁺ e⁻. Due to the low branching ratio of the π⁰ Dalitz decay (∼1.2%), a high statistics experiment is needed. The A2 experiment at MAMI, where π⁰ mesons are produced by photo-induced reactions on protons, provides a high yield of π⁰ Dalitz decays, and thus allows for a precision measurement of the π⁰ TFF. Both completed and upcoming contributions of the A2 collaboration to the precision measurements of the π⁰ TFF will be presented.