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The cusp effect in η′→η π π decays

  • Bastian Kubis
  • Sebastian P. Schneider
Regular Article - Theoretical Physics

Abstract

Strong final-state interactions create a pronounced cusp in η′→η π 0 π 0 decays. We adapt and generalize the non-relativistic effective field theory framework developed for the extraction of π π 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 π + π threshold.

PACS

11.30.Rd 13.25.Jx 13.75.Lb 

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2009

Authors and Affiliations

  1. 1.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical PhysicsUniversität BonnBonnGermany

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