Sin(phi) azimuthal asymmetry in semi-inclusive electroproduction on   longitudinally polarized nucleon
  We investigate the $sin \phi$ azimuthal asymmetry in the semi-inclusive deep-inelastic lepton scattering off longitudinally polarized nucleon target arising from the time reversal odd structures. The order 1/Q contributions of the leading twist and twist-three distribution and fragmentation functions to that asymmetry for the certain kinematical conditions are numerically estimated. 
K.A. Oganessyan, H.R. Avakian, N. Bianchi (LNF-INFN), A.M. Kotzinian   (CERN)