Single spin asymmetries in p↑p and p̄↑p inclusive processes

We consider several single spin asymmetries in inclusive p↑p and p̄↑p processes as higher twist QCD contributions, taking into account spin and intrinsic k⊥ effects in the quark distribution functions. This approach has been previously applied to the description of the single spin asymmetries observed in p↑p→π X reactions and all its parameters fixed: we give here predictions for new processes, which agree with experiments for which data are available, and suggest further possible measurements.