Twist-3 Single-Spin Asymmetry for SIDIS and its Azimuthal Structure
Abstract
We derive the complete twist-3 single-spin-dependent cross section for semi-inclusive DIS, ep eπ X, associated with the complete set of the twist-3 quark-gluon correlation functions in the transversely polarized nucleon, extending our previous study. The cross section consists of five independent structure functions with different azimuthal dependences, consistently with the transverse-momentum-dependent (TMD) factorization approach in the low qT region. Correspondence with the inclusive DIS limit and comparison with the TMD approach are briefly discussed.
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