The hidden strangeness mechanism in D+s → ωπ+ and D+s → ρ0π+ decays

We study possible contributions to the D-s(+) --> omega pi(+) and D-s(+) --> rho(o)pi(+) decay amplitudes. The D-s(+) --> omega pi(+) decay amplitude vanishes when naive factorization is used, while the D-s(+) --> rho(o)pi(+) 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 D-s(+) --> omega pi(+) amplitude might obtain additional contributions from D-s(+) --> rho(+)eta(eta') re-scattering. The low experimental bound on the D-s(+) --> rho(o)pi(+) rate can be understood as a result of combination of the pi(1300) pole dominated annihilation contribution and the K, K* internal exchanges. The calculated branching fractions for D-s(+) - omega pi(+) and D-s(+) --> rho(o)pi(+) are in agreement with the current experimental results.