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We consider the inclusive production of hadrons in lepton-nucleon scattering.For a transversely polarized nucleon this reaction shows a left-right azimuthalasymmetry, which we compute in twist-3 collinear factorization at leading orderin perturbation theory. All non-perturbative parton correlators of thecalculation are fixed through information from other hard processes. Ourresults for the left-right asymmetry agree in sign with recent data for chargedpion production from the HERMES Collaboration and from Jefferson Lab. However,the magnitude of the computed asymmetries tends to be larger than the data.Potential reasons for this outcome are identified. We also give predictions forfuture experiments and highlight in particular the unique opportunities at anElectron Ion Collider.

Left-right spin asymmetry in $\ell N^\uparrow \to h X$