  We consider the inclusive production of hadrons in lepton-nucleon scattering.
For a transversely polarized nucleon this reaction shows a left-right azimuthal
asymmetry, which we compute this asymmetry in both TMD and in twist-3 collinear
factorization formalisms. All non-perturbative parton correlators of the
calculation are fixed through information from other hard processes. Our
results for the left-right asymmetry agree in sign with recent data for charged
pion production from the HERMES Collaboration and from Jefferson Lab. We
discuss similarities and differences of two formalisms.
