Parton intrinsic motion: Unpolarized cross sections and the Sivers effect in inclusive particle production

We present a detailed study, performed in the framework of LO perturbative QCD with the inclusion of spin and k(perp) effects, of unpolarized cross sections for the Drell-Yan process and for inclusive pi and gamma production in hadronic collisions, in different kinematical situations. We find satisfactory agreement between theoretical predictions and experimental data. This supports the study of spin effects and transverse single spin asymmetries (SSA) within the same scheme. We then present results for SSA, generated by the so-called Sivers effect, in inclusive pion production in proton-proton collisions.