Abstract
Mechanism for the single transverse spin asymmeties in the pion production, p^\uparrow + p'\to π(\ell_T) + X, and the Λhyperon polarization, p + p' \to Λ^\uparrow (\ell_T)+ X, is investigated in the framework of QCD factorization theorem. We identify all the soft-gluon pole contributions coming from the twist-3 distribution and/or fragmentation functions and show that they give rise to large asymmetries at large x_F.
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