质子自旋含量、轴矢耦合常数与QCD拓扑磁化率
高能物理 - 唯象学
2007-05-23 v2
摘要
在外部场QCD求和规则的框架下，计算了由u、d、s夸克携带的质子自旋部分Σ。考虑了最高至维度9的算符。维度3算符贡献重要，在u、d、s夸克无质量极限下，该算符等于QCD拓扑磁化率χ′(0)的导数。与Σ的实验数据比较得到χ′(0)= (2.3 ± 0.6) × 10⁻³ GeV²。由求和规则的自洽性得到Σ和χ′(0)的限制：Σ = 0.33±0.20，χ′(0) = (2.4±0.5)·10⁻³ GeV。还确定了g_A = 1.37 ± 0.10和g_A⁸ = 0.65 ± 0.15的值。
引用
@article{arxiv.hep-ph/9810430,
title = {Proton spin content, axial coupling constant and QCD topological susceptibility},
author = {B. L. Ioffe and A. Oganesian},
journal= {arXiv preprint arXiv:hep-ph/9810430},
year = {2007}
}
备注
Invited talk at the Conference Baryon 98, Bonn, Sept. 22-26, 1998, to be published in Proceedings, 5 pages, LaTeX 2e, b98proc.sty, (style is enclosed) 1 eps figures included using epsf.sty