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HK: Fachverband Hadronen und Kerne

HK 51: Fundamental Symmetries

HK 51.4: Talk

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

Electromagnetic corrections in η→3π decays — •Christoph Ditsche¹, Bastian Kubis¹, and Ulf-G. Meißner^1,2 — ¹Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany — ²Institut für Kernphysik (Theorie) and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany

We re-evaluate the electromagnetic corrections to η→3π decays at next-to-leading order in the chiral expansion, arguing that effects of order e²(m_u−m_d) disregarded so far are not negligible compared to other contributions of order e² times a light quark mass. Despite the appearance of the Coulomb pole in η→π⁺π⁻π⁰ and cusps in η→3π⁰, the overall corrections remain small.