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Spin-orbit force of hyperon-nucleon interaction in the chiral SU(3) quark model

✍ Scribed by Shu Yang; Peng-nian Shen; Zong-ye Zhang; You-wen Yu

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
761 KB
Volume
635
Category
Article
ISSN
0375-9474

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✦ Synopsis

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 3Ps phase shifts of the nucleon-nucleon scattering) lead to very similar LS couplings in the Β£N(I = 3/2) channel but give quite different results in the AN Β£N(1 = 1/2) coupled-channel system. A prominent resonance occurs in the ~P~ state of the AN channel mainly due to the stronger LS ~-) couplings in the AN-SN(I = 1/2) coupled-channel system in the OGE enhanced case. Comparatively, the AN 1Pl phase 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. @ 1998 Elsevier Science B.V.

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