Nc limit of spin-flavor breaking in excited baryon levels

被引：107

作者：

Goity, JL ^{[1
]}

机构：

[1] Hampton Univ, Dept Phys, Hampton, VA 23668 USA

[2] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

来源：

PHYSICS LETTERS B | 1997年 / 414卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(97)01154-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Spin-flavor symmetry breaking in the levels of excited baryons are studied to leading order in the 1/N-c expansion. This breaking occurs at zeroth order. For non-strange baryons with a single quark excited, it is shown that to first order of perturbation theory the breaking is given by one I-body operator (spin-orbit), and three 2-body operators, all involving the orbital angular momentum of the excited quark. Higher-body operators can be reduced to that set of operators. As illustration. p-wave baryons are briefly discussed. (C) 1997 Elsevier Science B.V.

引用

页码：140 / 148

页数：9

共 34 条

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