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We calculate the absolute rate and kinematic dependence of the cross sections for the high-twist subprocesses qG-taq and q+nG in perturbative quantum chromodynamics (QCD). These cross sections are used to estimate the high-twist contribution to large-transverse-momentum inclusive single-pion production in hadronic collisions. We compare the normalization of these terms with leading-order minimum-twist QCD processes such as qG-tqG. The -high-twist contributions are shown to be quantitatively important forp, < 6 GeV2 and x , > 0.5, and they should be included in detailed analyses of data. We discuss cross sections and charge ratios, and we comment briefly about inclusive spin-correlation measurements at largep,.

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