Study of the Hyperon-Nucleon Interaction in the Quark Model

夸克模型中超子-核子相互作用的研究

基本信息

批准号：
04640296
负责人：
FUJIWARA Yoshikazu
金额：
$ 1.34万
依托单位：
KYOTO UNIVERSITY
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 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04640296/
关键词：
Quark model YN interaction Strangeness RGM P波バリオン

项目摘要

The purpose of this project is to study the hyperon-nucleon interaction in the constituent quark model. We have succeeded in a unified description of the hyperon-nucleon (YN) and nucleon-uncleon (NN) interaction in the RGM formulation of the SU_6 quark model, in which the full Fermi-Breit interaction with explicit flavor symmetry breaking is incorporated with minimum effective meson-exchange potentials induced from the scalar-meson central and pi, K tensor components of the Nijmegen model-F potential. With few strength parameters determined from the deuteron binding energy and NN ^1S_0 phase shift, all the low-energy cross sections of the YN interaction currently available are reasonably reproduced. In the intermediate-energy region with P_<Lab>=400-600MeV/c, we have found that this model yields a couple of new features in the total cross sections of the SIGMA^+p and LAMBDAp scatterings, which are not observed in the standard phenomenological one-boson-exchange potentials like the Nijmegen potentials. Namely, in SIGMA^+p system the big bump due to the very attractive ^1P_1 phase shifts observed in the Nijmegen models do not show up in the quark model. In LAMBDAp total scattering cross sections, our quark model yields a broad peak with the magnitude of about 100 mb, which is due to the very strong LS^< (-) > force predicted in the quark model. These differences are related to the basic characteristics of the quark model and the meson-exchange potentials in the short-range region, and are subject to the experimental test in near future.

该项目的目的是研究组成夸克模型中的超核子相互作用。我们在SU_6夸克模型的RGM公式中成功地描述了核核子（YN）和核子 - 核子（NN）相互作用，其中完整的Fermi-Breit与显式风味对称性的相互作用以最小的方式结合在一起nijmegen Model-f电位的标量 - 嵌入式中心和pi，k张量成分引起的有效介子交换电位。在很少的强度参数由Deuteron结合能和NN ^1S_0相移确定的情况下，当前可用的YN相互作用的所有低能横截面都是合理地复制的。在带有P_ <ab> = 400-600mev/c的中间能量区域中，我们发现该模型在Sigma^+P和Lambdap散射的总横截面中产生了几个新特征，这在标准的现象学单验交换电位，例如Nijmegen电位。也就是说，在Sigma ^+P系统中，由于在Nijmegen模型中观察到的非常有吸引力的 ^1p_1相移，因此在夸克模型中没有显示出很大的颠簸。在羔羊总散射横截面中，我们的夸克模型产生了一个宽峰，其大小约为100 Mb，这是由于夸克模型中预测的非常强的LS^<（ - ）>。这些差异与夸克模型的基本特征和短期区域中的介子交换势有关，并且在不久的将来接受实验测试。