【作者】 佟蕾；

【导师】 戴连荣；

【作者基本信息】 辽宁师范大学 ， 理论物理， 2006， 硕士

【摘要】 推广的手征SU(3)夸克模型是在手征SU(3)夸克模型的基础上引入了夸克和矢量场的耦合。这两个模型的短程相互作用机制不同。在手征SU(3)夸克模型中，短程力由单胶子交换作用提供，而在推广的手征SU(3)夸克模型中，短程力主要由矢量介子交换提供。在推广的手征SU(3)夸克模型下，我们成功地研究了了重子基态的结合能，N-N散射相移和氘核束缚态。利用相同的参数，本文在推广的手征SU(3)夸克模型下，应用共振群(RGM)方法，研究了矢量介子交换效应对非奇异双重子态d~*和奇异夸克数S=-3的ΔΩ(S=3，T=3／2)双重子态的影响。在推广的手征SU(3)夸克模型下，矢量介子交换对d~*和ΔΩ双重子态提供了更多的吸引效应，使其束缚加深。计算结果表明：1)ΔΩ是在NπΩ衰变道之上的弱束缚双重子态。2)即使考虑了隐色道效应，对d~*双重子态的结合能仍然在ΔNπ衰变道之上，这和别的模型中所预言的d~*是在NNππ衰变道之下的深度束缚的双重子态结论是很不同的。为了进一步检验我们的模型，本文还在推广的手征SU(3)夸克模型下计算了核子最低负宇称激发态N~*(1535)，N~*(1520)的能量。而重子谱的研究表明推广的手征SU(3)夸克模型比手征SU(3)夸克模型能更好的描述核子最低负宇称激发态的能量。更多还原

【Abstract】 The extended chiral SU(3) quark model has been proposed to study the different short-range interaction. Based on chiral SU(3) quark model, couplings among vector meson fields with quarks is considered in this extended chiral SU(3) quark model. There are totally different short-range mechanisms in this two models. The OGE is responsible for the short-range mechanism in the chiral SU(3) quark model, and vector meson change effect governs short-range mechanism in the extended chiral SU(3) quark model. In the extended chiral SU(3) quark model, the possible dibaryon candidates are predicted within the framework of resonating group method(RGM). We use the same sets of paramaters which have been successfully employed in the research of N-N scattering phase shifts and deuteron bound state, to study non-strangeness d* and strangeness S=-3 △Ω(S = 3,T = 3/2) dibaryons. The results show, compared to chiral SU(3) quark model, the binding energies of d* and △Ω will be enhanced in the extended chiral SU(3) quark model because the vector meson exchange offer more attractive force to them. However, the prediction of Aft is a weak bound dibaryon state above the threshold of NπΩ. Even though we considet the hidden color channel, the binding energy of d* is still above the threshold of △Nπ, which is very different with the prediction of deeply bound dibaryon state below the threshold of NNππ in other model. In order to test our model, we also give an analysis of the lowest excited states N*(1520) and N*(1535) of nucleon. with negtive parity. The results show, compared to chiral SU(3) quark model, the N*(1520) and N*(1535) states can be better described in the extended chiral SU(3) quark model.更多还原