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We calculate the contribution of the non-perturbative Pauli couplings in thequark-photon and quark-gluon vertices to the single-spin asymmetries (SSAs) insemi-inclusive deep inelastic scattering (SIDIS). We describe the nucleon usingthe spectator model with scalar and axial-vector diquarks. Both of the newcouplings can cause the helicity flip of the struck quark. The helicity flipand the rescattering induced by the non-perturbative gluon exchange between thestruck quark and diquark lead to the SSAs. Their azimuthal dependencies are thesame as that usually ascribed to the Collins and Sivers effects. Our numericalresults, based on the instanton model for the QCD vacuum, show that thenon-perturbative quark-gluon and quark-photon interactions have a stronginfluence on these asymmetries.

Single-spin asymmetries in SIDIS induced by anomalous gluon-quark and photon-quark couplings