Phenomenology of transverse single spin asymmetries in inclusive   processes
  A phenomenological description of single transverse spin asymmetries for the inclusive production of hadrons in proton-proton and lepton-proton processes is discussed within pQCD and a straightforward generalization of the factorization theorem with the inclusion of parton intrinsic transverse motion. Fits to existing data, predictions for new processes and interpretation of recent results are presented. 
M. Anselmino (1), M. Boglione (2), F. Murgia (3) ((1) University and   INFN, Torino, Italy, (2) Vrije Universiteit, Amsterda...