Estimating sigma-meson couplings from D \to 3\pi decays
  Using recent experimental evidence from E791 on the sigma meson in D \to 3\pi decays, we study the relevant couplings in D \to \sigma \pi and \sigma \to \pi\ pi within the accepted theoretical framework for non leptonic D decays. We also review the linear sigma model, finding that it gives a description which is consistent with the experimental data. 
C. Dib (UTFSM,Chile) and R. Rosenfeld (IFT-UNESP,Brazil)