Abstract
We investigate the mass splitting in the negative parity N ∗ and Δ ∗ spectrum where, experimentally, the spin-orbit force is found to be highly suppressed. A hyperfine interaction between quarks derived from a one-gluon and one-pion exchange model for a spherical chiral bag is used. The interaction is, unlike the usual Fermi-Breit force, fully relativistic and explicitly takes into account confinement effects. We analyze in detail how the force operates in the odd parity N ∗ and Δ ∗ spectrum and find that the suppression of spin-orbit forces, which is mysterious in constituent quark models, can be explained.
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