The hidden strangeness mechanism in Ds+→ωπ+ and Ds+→ρ0π+ decays

We study possible contributions to the Ds+→ωπ+ and Ds+→ρ0π+ decay amplitudes. The Ds+→ωπ+ decay amplitude vanishes when naive factorization is used, while the Ds+→ρ0π+ decay amplitude arises due to the annihilation contribution. We find that amplitudes for both decays might be a result of the internal K, K* exchange. The Ds+→ωπ+ amplitude might obtain additional contributions from Ds+→ρ+η(η′) re-scattering. The low experimental bound on the Ds+→ρ0π+ rate can be understood as a result of combination of the π(1300) pole dominated annihilation contribution and the K, K* internal exchanges. The calculated branching fractions for Ds+→ωπ+ and Ds+→ρ0π+ are in agreement with the current experimental results.