A_N in inclusive lepton-proton collisions
  Some estimates for the transverse single spin asymmetry, A_N, in the inclusive processes l p(transv. pol.) -> h X are compared with new experimental data. The calculations are based on the Sivers and Collins functions as extracted from SIDIS azimuthal asymmetries, within a transverse momentum dependent factorization approach. The values of A_N thus obtained agree in sign and shape with the data. Predictions for future experiments are also given. 
M. Anselmino (1,2), M. Boglione (1,2), U. D'Alesio (3,4), S. Melis   (1), F. Murgia (4), A. Prokudin (5) ((1) University of ...
hep-ph