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 momen tum of the quark-antiquark cloud in the internal structure of constitu ent quarks. We argue that the origin of the asymmetries in pion produc tion is a result of retaining this internal angular orbital momentum b y the perturbative phase of QCD through the transition from the nonper turbative phase. The nonperturbative hadron structure is based on the results of chiral quark models.