Abstract

The hadronic decays η→ πππ, η′→ πππ and η′→ ηππ are investigated within a U(3) chiral unitary approach. Final state interactions are included by deriving the effective s-wave potentials for meson–meson scattering from the chiral effective Lagrangian and iterating them in a Bethe–Salpeter equation. With only a small set of parameters we are able to explain both rates and spectral shapes of these decays.

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