The s-sbar and K-Kbar nature of f_0(980) in D_s decays
  We examine the D_s -> f_0(980) pi amplitude through a constituent quark-meson model, incorporating heavy quark and chiral symmetries, finding a good agreement with the recent E791 data analysis of D_s -> 3pi via f_0(980). The f_0(980) resonance is considered at the moment of production as an s sbar state, later evolving to a superposition of mainly s sbar and K Kbar. The analysis is also extended to the more frequent process D_s -> phi pi. 
A. Deandrea, R. Gatto, G. Nardulli, A.D. Polosa and N.A. Tornqvist