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

Abstract

We consider 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 of this internal angular orbital momentum by the perturbative phase of QCD under transition from the non-perturbative phase. The non-perturbative hadron structure is based on the results of chiral quark models. PACS number(s): 11.30.Qc, 12.40.Pp, 13.75.Ni, 13.88.+e

21 pages LaTeX + 8 figures (not included)

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• Tracing the origin of the single-spin asymmetries observed in inclusive hadron production processes at high energies
• On the flat transverse momentum dependence of the single-spin asymmetry in inclusive neutral pion production
• Different behaviour of the spin structure functions $g_1(x)$ and $h_1(x)$ at $x\to 0$
• On impact parameter dependence of low-x structure functions
• Proposal for the first measurement of antiproton polarization in proton-nucleus interactions