Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Hadron Structure and Spectroscopy VII
HK 39.5: Talk
Wednesday, March 16, 2016, 17:45–18:00, S1/01 A5
Investigation of neutral pion decays using the non-perturbative Dyson-Schwinger formalism — •Esther Weil, Gernot Eichmann, Christian Fischer, and Richard Williams — Justus-Liebig Universität Giessen, Deutschland
In this talk we present an investigation of neutral pion decays within this framework of Dyson-Schiwnger and Bethe-Salpeter equations. Our main objective is to determine the off-shell pion form factor (π0 → γγ), which serves as an important ingredient for calculations of other π0 decays. Examples include the three-body decay (π0→ γ e+ e−) or the rare decay (π0→ e+ e−). The pion form factor is also an important part in the hadronic light-by-light contribution to g-2. By systematically comparing with other approaches, we aim to improve the precision of the theory prediction within the Standard Model. This, together with improved experimental results, will lead to stronger constraints on various beyond-the-Standard-Model theories.