奇异数-1的双重子奇特态  

Exotic state of dibaryon with strangeness-1

作　　者：戴连荣[1] 周亚楠 扈岩 刘诗琪 蔡晓杰 蔡莉华 DAI Lianrong;ZHOU Yanan;HU Yan;LIU Shiqi;CAI Xiaojie;CAI Lihua(School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China)

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2020年第4期463-467,共5页Journal of Liaoning Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(11975009,11575076)。

摘　　要：双重子奇特态是一类全新的结构,其存在与否是检验基本相互作用的理想场所,所以理论和实验上受到关注.本研究组最早提出了手征SU(3)夸克模型,在此基础上为了研究短程相互作用机制进而提出了推广手征SU(3)夸克模型.研究表明这两个模型不但成功地描述了核子-核子和核子-超子散射过程,还准确预言了COSY实验发现的非奇异d*双重子奇特态.进而继续扩展到奇异夸克系统,引入奇异重子的新颜色结构,也就是隐色道效应.本文在推广手征SU(3)夸克模型下研究了隐色道效应对奇异数为-1自旋S=0的Σ*Δ双重子态系统的影响,结果表明:Σ*Δ系统在单道和耦合道计算中均可以形成束缚态,并且矢量介子交换机制下的隐色道效应没有单胶子交换机制下明显.The dibaryon exotic state is a new kind of structure and its existence is an ideal place to test basic interactions,it is an important and meaningful direction.Therefore,it has always attracted the interest and attention of physicists both theoretically and experimentally.The chiral SU(3)quark model was firstly proposed and then the extended chiral SU(3)quark model was further proposed to study the different mechanisms of short-range interaction.These two models are successful,since they not only described nucleon-nucleon and hyperon-nucleon scattering processes reasonably,but also predicted surprisingly the exotic state of d*nonstrange dibaryon confirmed by later COSY experiment.We extend to system with strangeness,introducing a novel color structure of strange baryon which is the so-called the hidden channel coupling.Within the framework of the extended chiral SU(3)quark model,the structure ofΣ*Δdibaryon with strangeness-1 and S=0 is studied,our results show that both in single channel or coupled channel calculations,the system would become bound.However,the hidden color effect from the vector meson exchange mechanism is not as obvious as that from one gluon exchange mechanism.

关 键 词：推广手征SU(3)夸克模型 矢量介子交换效应 双重子奇特态 隐色道 

分 类 号：O572.2[理学—粒子物理与原子核物理]