Final state interactions in the Ds+→ωπ+ and Ds+→ρ0π+ decays -: art. no. 094012

We investigate the decay mechanisms in the D-s(+)-->omegapi(+) and D-s(+)-->rho(0)pi(+) transitions. The naive factorization ansatz predicts a vanishing amplitude for the D-s(+)-->omegapi(+) decay, while the D-s(+)-->rho(0)pi(+) decay amplitude does have an annihilation contribution also in this limit. Both decays can proceed through intermediate states of hidden strangeness, e.g. K,K-*, which we estimate in this paper. These contributions can explain the experimental value for the D-s(+)-->omegapi(+) decay rate, which no longer can be viewed as a clean signature of the annihilation decay of D-s(+). The combination of the pi(1300) pole dominated annihilation contribution and the internal K,K-* exchange can saturate the present experimental upper bound on the D-s(+)-->rho(0)pi(+) decay rate, which is therefore expected to be within experimental reach. Finally, the proposed mechanism of hidden strangeness final state interactions constitutes only a small correction to the Cabibbo allowed decay rates D-s-->KK*,phipi, which are well described already in the factorization approximation.