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We investigate the decay mechanisms in the Ds+ --> omega pi+ and Ds+ --> rho0pi+ transitions. The naive factorization ansatz predicts vanishing amplitudefor the Ds+ --> omega pi+ decay, while the Ds+ --> rho0 pi+ decay amplitudedoes have an annihilation contribution also in this limit. Both decays canproceed through intermediate states of hidden strangeness, e.g. K, K*, which weestimate in this paper. These contributions can explain the experimental valuefor the Ds+ --> omega pi+ decay rate, which no longer can be viewed as a cleansignature of the annihilation decay of Ds+. The combination of the \pi(1300)pole dominated annihilation contribution and the internal K, K* exchange cansaturate present experimental upper bound on Ds+ --> rho0 pi+ decay rate, whichis therefore expected to be within the experimental reach. Finally, theproposed mechanism of hidden strangeness FSI constitutes only a smallcorrection to the Cabibbo allowed decay rates Ds--> K K*, phi pi, which arewell described already in the factorization approximation.Comment: 12 pages, 3 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Final state interactions in theDs+→ωπ+and