Ds decays to η and η′ final states: a phenomenological analysis

We consider the semileptonic and nonleptonic Ds decay modes to final states with η and η′. We use QCD sum rules to determine the Ds→η form factor f+η, and a generalized factorization ansatz to compute nonleptonic decays. We propose a parameterization of possible OZI suppressed contributions producing the η′ in the final state, compatible with current data; such a scheme can be further constrained improving the precision of the measurement of the Ds decay rates, as expected by the ongoing experiments.