The cusp effect in η ′ → ηππ decays
نویسندگان
چکیده
Strong final-state interactions create a pronounced cusp in η → ηππ decays. We adapt and generalize the non-relativistic effective field theory framework developed for the extraction of ππ scattering lengths from K → 3π decays to this case. The cusp effect is predicted to have an effect of more than 8% on the decay spectrum below the ππ threshold. PACS. 11.30.Rd Chiral symmetries – 13.25.Jx Decays of other mesons – 13.75.Lb Meson–meson interactions
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