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We revisit the connection between generalized parton distributions in impactparameter space and T-odd effects in single spin asymmetries of thesemi-inclusive deep inelastic process. We show that nontrivial relations can beestablished only under very specific conditions, typically realized only inmodels that describe hadrons as two-body bound systems and involving ahelicity-conserving coupling between the gauge boson and the spectator system.Examples of these models are the the scalar-diquark spectator model or thequark-target model for the nucleon, and relativistic models for the pion at thelowest order in the Fock-space expansion.

Revisiting model relations between T-odd transverse-momentum dependent parton distributions and generalized parton distributions