Abstract
Diagrams contributing to Ds→ωπ and Ds→ρπ decays are classified by topology as (a) OZI‐forbidden or disconnected, (b) OZI‐allowed or connected; by helicity as (a) helicity‐conserving, (b) with helicity flips on both outgoing quark lines. The Ds→ωπ decay has an exotic final state and is forbidden for all annihilation diagrams which go via an intermediate state containing a single quark‐antiquark pair and less than two additional gluons. It is also forbidden for helicity‐conserving OZI‐allowed diagrams, which are expected to be dominant and are allowed for Ds→ρπ decays.
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