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Roles of Instantons in the Low Energy QCD

瞬子在低能 QCD 中的作用

基本信息

批准号：
04640288
负责人：
OKA Makoto
金额：
$ 0.96万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

This research aims at the study of properties and effects of the instanton induced interaction, which comes from te coupling of light quarks to the QCD instanton solution. We pointed out that the instanton induced interaction has a distinctive color-flavor structure and thus shws a different spin-flavor dependences from the perturbatve gluon exchange nteraction. We proposd that a part of the gluon exchange force in the baryon spectrum is in fact the instanton induced interaction and then some of the difficulties that the quark model fces can be solved.This interaction gives a distinctive features in the baryon-baryn interactions at short distances. According to the quark cluster model calculation, the instanton induced interaction yields a new attractive force between two nuceons. Furthermore, the H dibaryon system receives a strong repulsion due to the three-body part of the instanton induced interaction. We conclude that the H dibaryon may not show as a deep bound state below the two lambda threshould. We studied the effects of the instanton indeuced interaction in other dibaryon systems.The P-wave baryon spectrum, the spin-orbit force is weak in the nonstrange system, while it gives fair splittings in the strange sector. The short distance NN interactin also requires a strong spin-orbit force among quarks. We pointed out that the spin-orbit force has two origins, the instanton induced interaction and the gluon exchange, which brings the various spin-orbit structures.

本研究旨在研究轻夸克与QCD瞬子解的耦合所引起的瞬子诱导相互作用的性质和效应。我们指出，瞬子诱导的相互作用具有独特的色味结构，因而表现出与微扰胶子交换相互作用不同的自旋味依赖性。我们提出重子谱中胶子交换力的一部分实际上是瞬子诱导的相互作用，从而解决了夸克模型fces的一些困难，这种相互作用在短距离的重子-重子相互作用中具有独特的性质。根据夸克集团模型的计算，瞬子诱导的相互作用在两个核子之间产生了一种新的吸引力。此外，由于瞬子诱导相互作用的三体部分，H二重子系统受到很强的排斥。我们得出结论：在两个λ阈值以下，H重子可能不表现为深束缚态。我们研究了其它双重子系统中的瞬子诱导相互作用的影响，在非奇异系统中，P波重子谱、自旋轨道力很弱，而在奇异扇区中，它给出了较好的分裂。短距离NN相互作用还需要夸克之间强大的自旋轨道力。我们指出自旋轨道力有两个来源，即瞬子诱导相互作用和胶子交换，这两个来源导致了各种自旋轨道结构。