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We present the complete results up to twist-3 for hadron production in thetarget fragmentation region of semi-inclusive deep inelastic scattering with apolarized lepton beam and polarized nucleon target. The nonperturbative effectsare factorized into fracture functions. The calculation up to twist-3 isnontrivial since one has to keep gauge invariance. By applying collinearexpansion, we show that the hadronic tensor can be expressed by gauge-invariantfracture functions. We also present the results for the structure functions andazimuthal asymmetries.

Twist-3 Contributions in Semi-Inclusive DIS in the Target Fragmentation Region