Left-right asymmetry and orbiting valence quarks in polarized protons and antiprotons
It is shown that the asymmetry observed in the recent single-spin large-xF inclusive pion production experiments at high-energies should be considered as a strong indication for the existence of orbiting valence quarks in polarized protons and antiprotons. The underlying physical picture in which orbiting valence quarks give rise to flavor-currents is discussed. The close connection between these currents and the measured quantities — in particular baryon's magnetic moment and the abovementioned asymmetry — is pointed out.