Abstract
We present calculations of normalized higher twist contributions in three processes in which the central sub-processes are related by crossing: the production of hadrons at high transverse momentum relative to the thrust axis ine + e − annihilation, photoproduction of high transverse momentum pions from a proton target, and high transverse momentum lepton pair production in π− p collisions. The last of these is most interesting, not only because the higher twist contribution is significant, but also the QCD interpretation of the data is uncertain.
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