Helicity Formalism and Spin Asymmetries in Hadronic Processes
  We present a generalized QCD factorization scheme for the high energy inclusive polarized process, (A, S_A) + (B, S_B) -> C + X, including all intrinsic partonic motions. This introduces many non-trivial azimuthal phases and several new spin and k_T dependent soft functions. The formal expressions for single and double spin asymmetries are discussed. Numerical results for A_N[p(transv. polarized) p -> pi + X] are presented. 
M. Anselmino (1), M. Boglione (1), U. D'Alesio (2), E. Leader (3), S.   Melis (2), F. Murgia (2) ((1) University and INFN, T...