Spin-Orbit Force in Baryon Spectrum

YU You-Wen; ZHANG Zong-Ye

Chinese Physics C> 2004, Vol. 28> Issue(6) : 594-600

Spin-Orbit Force in Baryon Spectrum

YU You-Wen ^, ,
ZHANG Zong-Ye

Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
In the framework of the constituent quark model, the spin-orbit splitting of the lowest L=1 excited states of N and Λ are analyzed by using various quark potential models. The results show that only when a two gluon exchange phenomenological flavor dependent l·s term is considered in the potential, the spin-orbit splitting of N and two sets of Λ L=1 states can be explained simultaneously.

References

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. Isgur N, Karl G. Phys. Rev. , 1978, D18: 41872. Glozman L Ya, Riska D O. Phys. Rep. , 1996, 268: 2633. DONG Yu-Bing, YU You-Wen. HEP NP, 1993, 17: 651 (in Chinese)(董宇兵,余友文.高能物理与核物理,1993,17:651) 4. Fernandez F et al . Phys. G. , 1993, 19: 20135. ZHANG Z Y et al. Nucl. Phys. , 1994, A578: 5736. ZHANG Z Y et al. Nucl. Phys. , 1997, A625: 597. Gell-Manm M, Levy M. Nuovo. Cimento, 1960, 16: 7058. ZHANG Z Y, YU Y W, DAI L R. HEP NP, 1996, 20: 363(in Chinese)(张宗烨,余友文,戴连荣.高能物理与核物理,1996,20:363) 9. Yamamoto Y, Bando H. Prog. Theor. Phys. Suppel . , 1985, 81: 910. YU Y W, ZHANG Z Y, SHEN P N. HEP NP, 1992, 16: 1015 (in Chinese)(余友文,张宗烨,沈彭年.高能物理与核物理,1992,16:1015)

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YU You-Wen and ZHANG Zong-Ye. Spin-Orbit Force in Baryon Spectrum[J]. Chinese Physics C, 2004, 28(6): 594-600.

YU You-Wen and ZHANG Zong-Ye. Spin-Orbit Force in Baryon Spectrum[J]. Chinese Physics C, 2004, 28(6): 594-600. shu

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Received: 2003-12-08
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Spin-Orbit Force in Baryon Spectrum

YU You-Wen ^,
ZHANG Zong-Ye

Corresponding author: YU You-Wen,

Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date: 2003-12-08
Accepted Date: 1900-01-01
Available Online: 2004-06-05

Abstract: In the framework of the constituent quark model, the spin-orbit splitting of the lowest L=1 excited states of N and Λ are analyzed by using various quark potential models. The results show that only when a two gluon exchange phenomenological flavor dependent l·s term is considered in the potential, the spin-orbit splitting of N and two sets of Λ L=1 states can be explained simultaneously.