Sivers and Collins effects in polarized pp scattering processes
  We summarize the present phenomenology of Sivers and Collins effects for transverse single spin asymmetries in polarized proton-proton collisions within the framework of the generalized parton model (GPM). We will discuss a reassessment of the Collins effect and some preliminary predictions for SSA's in p(pol) p -> pi,K + X processes at RHIC obtained using updated information from SIDIS data and a new set of meson fragmentation functions. 
M. Anselmino (1), M. Boglione (1), U. D'Alesio (2,3), E. Leader (4),   S. Melis (1), F. Murgia (3) ((1) University and INFN,...