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The final-state interaction effects on the inclusive two-particle productionin electron-positron annihilation are investigated within the context of theone-photon annihilation approximation. Such effects are characterized by onestructure function in the decomposition of the hadronic tensor. On the basis ofthe positivity, we derived an inequality to bound this structure function. Theprice to access it experimentally is to polarize longitudinally one of theinitial-state beam, to say, the electron beam, and measure the correspondingsingle spin asymmetry. By combining the Callan-Gross relation with ourpositivity analysis, we obtain an upper bound for the single spin asymmetryconsidered.Comment: Revtex, 11 pages, 1 figure in postscript, to appear in J. Phys.

Final-state interaction effects on inclusive two-particle production in electron - positron annihilation