Abstract
We study the structures in cross sections and $R$ ratios concerning ${e}^{+}{e}^{\ensuremath{-}}$ annihilation reactions, for open-strangeness, open-charm, and open-beauty hadron-pair production, from the perspective of a recently developed production formalism. Special attention is paid to nonresonant contributions. Known, tentative, and yet unknown resonances are spotted, with estimates for their masses and widths.
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