Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 74: Fundamental Symmetries

HK 74.6: Talk

Thursday, March 19, 2009, 18:00–18:15, H-ZO 70

Analysis of η→π⁺π⁻γ measured with WASA-at-COSY — •Christoph Florian Redmer — Institut für Kernphysik and Jülich Center for Hadron Physics, D-52425 Jülich, Germany

The decay η→π⁺π⁻γ is driven by the box anomaly of the chiral Lagrangian. Precise studies of the two pion system allow for tests of Chiral Pertubation Theory and its unitarized extensions, as e.g. VMD or the chiral unitary approach. Moreover, this decay channel also provides a test for C-violation in electromagnetic interactions of strongly interacting particles and even a test for a possible flavor-conserving CP-violation.

WASA-at-COSY collected data in October 2008, producing η mesons in the reaction pd→³Heη. About 10⁷ η mesons have been recorded, tagged only by the registration of the ³He ions which allows also for the determination of absolute branching ratios.

In this presentation the analysis of these data with respect to the η→π⁺π⁻γ decay will be discussed.

— Supported by BMBF, DAAD and Wallenberg Foundation