The hidden strangeness mechanism in Ds+ -> omega pi+ and Ds+ -> rho0 pi+ decays
Svjetlana Fajfer, Anita Prapotnik, Paul Singer, Jure Zupan
Abstract
We study possible contributions to the Ds+ -> omega pi+ and Ds+ -> rho0 pi+ decay amplitudes. The Ds+ -> omega pi+ decay amplitude vanishes when the naive factorization is used, while the Ds+ -> rho0 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 Ds+ -> omega pi+ amplitude might obtain additional contribution from Ds+ -> rho0 eta (eta') re-scattering. The low experimental bound on the Ds+ -> rho0 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 Ds+ -> omega pi+ and Ds+ -> rho0 pi+ are in agreement with the current experimental results.
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