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Final-state Interaction Effects on Inclusive Two-particle Production in Electron-positron Annihilation
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 derived an inequality to bound this structure function. The
price to access it experimentally is to polarize longitudinally one of the
initial-state beam, to 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.Comment: Revtex, 11 pages, 1 figure in postscript, to appear in J. Phys.