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We study the single transverse spin asymmetry for the inclusive pionproduction in the nucleon-nucleon collision, p^\uparrow p\to\pi X, based on thetwist-3 mechanism in the collinear factorization. We derive thesoft-fermion-pole (SFP) contribution to the twist-3 single-spin-dependent crosssection associated with the twist-3 quark-gluon correlation functions in thepolarized nucleon. We find that the SFP can give rise to a large effect to theasymmetry A_N owing to the large partonic hard cross sections with the largecolor factor, if the SFP function has a similar magnitude as thesoft-gluon-pole (SGP) function, in spite of the absence of the "derivativeterm" for the SFP function unlike for the SGP function.

Soft-fermion-pole contribution to single-spin asymmetry for pion production in pp collisions