Spin content of constituent quarks and one-spin asymmetries in inclusive processes

We consider a mechanism for one-spin asymmetries observed in inclusive hadron production. The main role belongs to the orbital angular momentum of the quark-antiquark cloud in the internal structure of constituent quarks. We argue that the origin of the asymmetries in pion production is a result of retaining this internal angular orbital momentum by the perturbative phase of QCD through the transition from the nonperturbative phase. The nonperturbative hadron structure is based on the results of chiral quark models.