Quark-Photon-Quark Correlation and Transverse Target Single Spin   Asymmetry in Inclusive DIS
  We calculate the q q correlation function associated to transverse target lepton-nucleon inclusive deep-inelastic scattering by direct evaluation of the corresponding matrix element. We use the electromagnetic impact parameter potential for a transversely polarized nucleon to define the q q correlation function for each avor in terms of the field components of that avor. The results are compared with the two existing models for the q q correlator. Using the calculated q q correlation function, we estimated the transverse target SSA in IDIS process. 
Matthias Burkardt and Tareq Alhalholy
hep-ph