Abstract
The spin-orbit (LS) force of the hyperon-nucleon interaction is studied in the chiral SU(3) quark model. The symmetric LS terms from the one gluon exchange (OGE) and the scalar nonet exchange (OSE) are taken into account. It is shown that two different treatments (the LS coupling from either OGE or OSE being artificially enhanced in order to reproduce the 3 P J phase shifts of the nucleon-nucleon scattering) lead to very similar LS couplings in the ΣN(I = 3 2 ) channel but give quite different results in the ΛN - ΣN(I = 1 2 ) coupled-channel system. A prominent resonance occurs in the 1 P 1 state of the ΛN channel mainly due to the stronger LS (−) couplings in the ΛN - ΣN(I = 1 2 ) coupled-channel system in the OGE enhanced case. Comparatively, the ΛN 1 P 1phase shift curve exhibits a rather smooth behaviour in the OSE enhanced case. Comparing our theoretical results with the experimental data available, and considering the requirement of the baryon spectrum, one can deduce that a stronger color-independent LS coupling is preferred in the chiral quark model.
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