Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-03
Nucl.Phys. A642 (1998) 543-561
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages & 2 figures
Scientific paper
10.1016/S0375-9474(98)00539-9
Effects of the spin orbit-force on hadronic systems with strangeness or charm are investigated by a valence quark model with the instanton-induced interaction. By introducing this interaction, the spin-orbit splittings in the negative-parity hyperons becomes 0.14 -- 0.37 times smaller. The flavor-octet baryon mass spectrum and the splittings in the charmed baryons become consistent with the experiments. Though the splitting is also reduced in the flavor-singlet baryons, it still gives two third of the experimental value. The reduction comes from the cancellation between the one-gluon exchange and the instanton-induced interaction, which is channel-specific. In most of the two-baryon channels, the symmetric and antisymmetric spin-orbit force of the YN interaction remains strong after introducing this instanton effect. A few exceptional channels, however, are found where the cancellation affects strongly and the spin-orbit force becomes small.
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