Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 13: Poster Session: Theory

HK 13.6: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

The anomalous decays η / η′ → π⁺ π⁻ γ — •Robin Nißler and Buḡra Borasoy — Institute for Theoretical Physics (T39), TU München, Germany

The axial anomaly of QCD dominates various low-energy processes involving light mesons. Interesting examples for such anomalous processes are the decays of η and η′ into π⁺ π⁻ γ, since they reveal information on both the chiral and the axial U(1) anomaly and, furthermore, yield constraints for η-η′ mixing.

The shape of the photon spectra in these decays cannot be understood without considering resonances. We show the results of a calculation within a chiral effective field theory including dynamically generated resonances [1]. Financial support of the Deutsche Forschungsgemeinschaft is gratefully acknowledged.

• [1] B. Borasoy and R. Nißler, in preparation