A study on quark-exchange and meson-exchange in nuclear force

核力中夸克交换和介子交换的研究

基本信息

批准号：
02640216
负责人：
YAZAKI Koichi
金额：
$ 1.66万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

The relation between two mechanisms of nuclear force,i.e.the meson exchange and the quark exchange, has been studied and a hybrid model unifying the two mechanisms has been proposed and applied to baryon-baryon interaction. A problem of vector meson exchange mechanism in generating the short-range repukion was examined in detail and it was found that only the overall attractive contribution due to the spatial components of the vector meson should be added to the quark exchange contribution. It was also found that the contributions of scalar and pseudo-scalar meson exchanges could be simply added. Based on this observation,we have made a semi-phenomenological analysis of baryon-baryon interaction in the quark cluster model supplemented by pseudo-scalar meson exchanges. Properties of the H-dibaryon were predicted and, under the condition that it existed, the nucleon-H-dibaryon interaction was also studied in the same framework. As for a relativistic quark model describing mesons and baryons in a unified way, we have chosen the Nambu-Jona-Lasinio model and first studied the baryons in a mean field approximation. The role of the six-Fermi interaction representing the chiral anomaly in stabilizing the mean field solution was clarified. We have proceeded further to solve a relativistic Faddeev equation for the baryon as a three-quark system and have obtained a preliminary solution for a simple case of quark-quark interaction only in ^1So state. The extension to a more general interaction is underway.

已经研究了两个核力量机制，即介子交换和夸克交换之间的关系，并提出了统一两种机制的混合模型，并应用于巴里昂 - 巴里昂的相互作用。详细检查了媒介中介子交换机制在产生短程储备时的一个问题，发现仅应将由于矢量梅森的空间成分引起的总体有吸引力的贡献添加到夸克交换贡献中。还发现，可以简单地添加标量和伪量表中的介子交换的贡献。基于这一观察结果，我们对由伪量表梅森交换补充的夸克群集模型中的巴属 - 巴里昂相互作用进行了半光学分析。预测了H-二巴的性质，并且在存在的条件下，还研究了在同一框架中的核素-H-Dibaryon相互作用。至于以统一的方式描述介子和重子的相对论夸克模型，我们选择了Nambu-Jona-Lasinio模型，并首先在平均场近似中研究了Baryons。阐明了代表手性异常在稳定平均场溶液中的六-FERMI相互作用的作用。我们已经进一步求解了Baryon作为三夸克系统的相对论FADDEEV方程，并为仅在 ^1SO状态下的Quark-Quark相互作用的简单情况获得了初步解决方案。正在进行更通用的交互作用的扩展。