2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177570We consider the nonleptonic and semileptonic decays of $D_s$-mesons into $ϕ$ and $f_0(980)$ mesons. QCD sum rules are used to calculate the form factors associated with these decays, and the correspondig decay rates. On the basis of data on $D_s^+\toπ^+π^+π^-$, which goes dominantly via the transition $D_s^+\to π^+f_0(980)$, we conclude that there is space for a sizeable light quark component on $f_0(980)$.14 pages, RevTeX4 including 5 figures in ps filesHigh Energy Physics - PhenomenologyNuclear Theorytext