Experimental data on the single spin asymmetry and their interpretations   by the chromo-magnetic string model
  An attempt is made to interpret the various existing experimental data on the single spin asymmetries in inclusive pion production by the polarized proton and antiproton beams. As the basis of analysis the chromo-magnetic string model is used. A whole measured kinematic region is covered. The successes and fails of such approach are outlined. The possible improvements of model are discussed. 
S.B. Nurushev and M.G. Ryskin