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The Study of N-Σ and N-Λ Interaction

Author: ZhuLiNan
Tutor: DaiLianRong
School: Liaoning Normal University
Course: Theoretical Physics
Keywords: extended chiral SU(3) quark model nucleon-huperon vector meson exchange
CLC: O572.33
Type: Master's thesis
Year: 2008
Downloads: 7
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Abstract


Content:In the chiral SU(3) quark model,we use the coupling between quarks and nonet scalar meson fields and nonet pseudo-scalar meson fields to describe the medium and long rang interactions,and use one gluon exchange to describe the short range interacton. In the extended chiral SU(3) quark model,besides the nonet pseudo-scalar meson fields and the nonet scalar meson fields,the coupling between vector meson fields and quarks is also considered,the short range interaction can be described dominately by vector meson exchange,therefore,the mechanisems between these two models are totally different.In this paper,nucleon-hyperon interaction has been investigated within the framework of the extended chiral SU(3) quark model using the resonating group method(RGM). Firstly,we study the N-∑scattering process.The the S-,P-,D-and F-wave phase shifts of N-Σare given,the results shows that the N-Σinteraction can be described either by chiral SU(3) quark model or by extended chiral SU(3) quark model,their results are similar.We further compare the GCM matrix elements of vector meson(K~*,ρ,ω,andφ) in the extended chiral SU(3) quark model to those of one gluon exchange in the chiral SU(3) quark model,the results shows the different short range interactioncontribute the N-Σscattering process.When we consider the partial wave coupling,the tensor force provides attraction in S-wave interaction,but repulsion in D-wave interaction.Then we investigate the N-∧scattering process,the qualitative conclusion is similar to that of N-Σscattering process.This means N-∧interaction can be described either by chiral SU(3) quark model or by extended chiral SU(3) quark model.When we consider partial wave coupling,the tensor force provides attraction.When we consider channel coupling,the effect from channel coupling also provides attraction.After we consider partial wave coupling and channel coupling,the attraction can be enhanced and consequently,the phase shifts can be enhanced.In summary,by studying the N-Σand N-∧scattering process,we found that the short-range interaction of N-Σand N-∧systems can be described either by the one-gluon exchange or vector meson exchange.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle types > Meson
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