Abstract
The final-state interaction effects on the inclusive two-particle production in electron - positron annihilation are investigated within the context of the one-photon annihilation approximation. Such effects are characterized by one structure function in the decomposition of the hadronic tensor. On the basis of the positivity, we derive an inequality to bound this structure function. The price to access it experimentally is to polarize longitudinally one of the initial-state beams, say, the electron beam, and measure the corresponding single-spin asymmetry. By combining the Callan - Gross relation with our positivity analysis, we obtain an upper bound for the single-spin asymmetry considered.
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