手性组成夸克模型中的重子

L. Glozman
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引用次数: 6

摘要

在低能状态下,光和奇异重子应被视为具有约束相互作用和手性相互作用的组成夸克系统,这种相互作用由戈德斯通玻色子以及矢量和标量介子介导。自旋-自旋结构和自旋力短程部分的符号将St/(6)FS对称性降低到SU(3)F × SU(2)S,诱导了超精细分裂,并提供了正负宇称最低态的正确排序。在重子中,赝标量和矢量交换所产生的张量力相互抵消。类p交换和类ω交换的自旋轨道相互作用在重子中相互抵消,同时在神经网络系统中产生较大的自旋轨道力。给出了在半相对论框架下计算的光和奇异重子谱的统一描述。证明了当组成夸克之间的自旋-自旋相互作用相同的短程部分在神经网络系统中引起强的短程斥力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Baryons in a chiral constituent quark model
Abstract In the low-energy regime light and strange baryons should be considered as systems of constituent quarks with confining interaction and a chiral interaction that is mediated by Goldstone bosons as well as by vector and scalar mesons. The flavor-spin structure and sign of the short-range part of the spin-spin force reduce the St/(6)FS symmetry down to SU(3)F × SU(2)S, induce hyperfine splittings and provide correct ordering of the lowest states with positive and negative parity. There is a cancellation of the tensor force from pseudoscalar- and vector-exchanges in baryons. The spin-orbit interactions from p-like and ω-like exchanges also cancel each other in baryons while they produce a big spin-orbit force in NN system. A unified description of light and strange baryon spectra calculated in a semirelativistic framework is presented. It is demonstrated that the same short-range part of spin-spin interaction between the constituent quarks induces a strong short-range repulsion in NN system when the...
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