Flavor symmetry breaking in the 1/N-c expansion

被引：127

作者：

Dai, J

Dashen, R

Jenkins, E

Manohar, AV

机构：

[1] Department of Physics, University of California at San Diego, La Jolla, CA

来源：

PHYSICAL REVIEW D | 1996年 / 53卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.53.273

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The breaking of flavor SU(3) symmetry in the axial vector couplings and magnetic moments of baryons is analyzed in the 1/N-c expansion. A simple meson loop graph which is known to be of order root m(s) and leading order in 1/N-c correctly predicts the pattern of symmetry breaking in the magnetic moments. It is, however, not possible to use this graph to predict the magnitude of the breaking. The situation with the axial vector couplings is less clear. In this case the breakings are relatively small and do not appear to follow an obvious pattern. Nevertheless there is a clear indication that, with symmetry breaking taken into account, the F/D ratio [defined in the presence of SU(3) breaking] is considerably less than the SU(6) value of 2/3. With sizable uncertainty, we find F/D approximate to 0.44. The quantity 3F - D which is relevant for the analysis of spin-dependent deep inelastic scattering is considerably smaller than the SU(6) value of unity. The new value 3F - D = 0.28 +/- 0.09 is consistent with vanishing strange-quark spin in the nucleon.

引用

页码：273 / 282

页数：10

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