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We present our recent analysis on the transverse single-spin asymmetry (SSA)in inclusive pion and direct-photon production in pp collisions for RHICkinematics. The analysis includes the contributions from twist-3quark-gluon-quark correlations in the proton and twist-3 fragmentation effectsfor the pion. Some of the functions appearing in the formula for the SSA, suchas the soft-gluon-pole Qiu-Sterman function, the nucleon transversity, and theCollins function were fixed consistently with the SSA data in semi-inclusiveDIS and in e+e- annihilation, so that our analysis is free from the signmismatch problem.

Collinear Twist-3 Approach to Transverse Single-Spin Asymmetry in Proton-Proton Collision