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We study the structures in cross sections and R ratios concerningelectron-positron annihilation reactions, for open-strangeness, open-charm andopen-beauty hadron-pair production, from the perspective of a recentlydeveloped production formalism. Special attention is paid to non-resonantcontributions. Known, tentative, and yet unknown resonances are spotted, withestimates for their masses and widths.

Production of hadron pairs in electron-positron annihilation near the K(+)K(-), D-Dbar, B-Bbar and Lambda(c)(+)-Lambda(c)(-) thresholds