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A dominant QCD mechanism for the single transverse-spin asymmetry in hardprocesses is induced by the twist-3 quark-gluon correlations inside nucleon,combined with the soft-gluonic poles to produce the interfering phase for theassociated partonic hard scattering. It is shown that the correspondinginterfering amplitude can be calculated entirely in terms of the partonic Borncross section which participates in the twist-2 cross section formula for thespin-averaged process.Comment: 4 pages, 2 figures. Talk presented at SPIN2006, October 2-7, 2006,  Kyoto, Japa

A New Approach for Single Transverse-Spin Asymmetries from Twist-3 Soft-Gluon Mechanism